CN112709558A - Method for determining deployment position of steam injection well and method for converting oil reservoir from water drive to steam drive - Google Patents
Method for determining deployment position of steam injection well and method for converting oil reservoir from water drive to steam drive Download PDFInfo
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
本说明书提供确定注汽井部署位置的方法和油藏由水驱转蒸汽驱的方法，确定注汽井部署位置的方法包括：根据井组的注采动态响应特性，确定井组中的水窜井和处在水窜方向上的注水井；根据所述水窜井的产液特性、所述注水井的吸水特性和地层特征数据，确定水窜通道的范围和所述水窜通道的存水孔隙体积；根据所述水窜通道的范围和所述水窜通道的存水孔隙体积，确定注汽井的部署位置。采用前述方法选定的注汽井进行油藏由水驱转蒸汽驱开发，在实现地层中稠油油藏蒸汽驱开采的同时，可以减少蒸汽热量被水窜通道的存水吸收量，提高蒸汽热能的利用效率。
This specification provides a method for determining the deployment position of steam injection wells and a method for converting oil reservoirs from water flooding to steam flooding. The method for determining the deployment position of steam injection wells includes: determining the water channeling in the well group according to the dynamic response characteristics of injection and production in the well group wells and water injection wells in the direction of water channeling; according to the liquid production characteristics of the water channeling wells, the water absorption characteristics of the water injection wells and the formation characteristic data, the range of the water channeling channels and the water storage of the water channeling channels are determined Pore volume; according to the range of the water channeling channel and the water storage pore volume of the water channeling channel, determine the deployment position of the steam injection well. Using the steam injection wells selected by the above method to develop the reservoir from water flooding to steam flooding, while realizing the steam flooding of heavy oil reservoirs in the formation, it can reduce the amount of steam heat absorbed by the water storage in the water channeling channel, and improve the steam flooding. heat utilization efficiency.
Description
Technical Field
The specification relates to the technical field of oil exploitation, in particular to a method for determining the deployment position of a steam injection well and a method for converting water drive to steam drive of an oil reservoir.
Background
In the oil exploitation technology, water-drive exploitation is still a widely adopted secondary oil exploitation method, and is mainly used for developing a thin oil reservoir with the viscosity of less than 150mPa & s; when the method is used for exploiting a heavy oil reservoir with the viscosity of over 150 mPas, the economy of water-drive exploitation is obviously reduced. Influenced by factors such as heterogeneity, prosody and oil-water viscosity difference of the oil reservoir, after water flooding development, the heavy oil in the oil reservoir generally reaches the upper layer position containing the well section, namely the upper part in the layer from the negative electrode.
In order to overcome the problem of poor economy of water-drive heavy oil reservoir exploitation, steam-drive exploitation is available as a scheme for replacing water-drive exploitation after water-drive exploitation. Steam flooding recovery is achieved by heating the heavy oil so that the viscosity of the heavy oil reservoir is reduced to a certain level.
Disclosure of Invention
The specification provides a method for arranging a steam injection well and a method for converting oil deposit from water drive to steam drive, which are used for arranging the steam injection well and determining the technological parameters of the steam drive when the water drive is converted into the steam drive, so that the effective utilization of steam drive heat energy is realized.
In one aspect, the present description is directed to a method of determining a location for deployment of a steam injection well, comprising:
determining a water channeling well and a water injection well in the well group in the water channeling direction according to the injection-production dynamic response characteristics of the well group;
determining the range of a water channeling channel and the water storage pore volume of the water channeling channel according to the liquid production characteristics of the water channeling well, the water absorption characteristics of the water injection well and the formation characteristic data;
and determining the deployment position of the steam injection well according to the range of the water channeling channel and the volume of a water storage hole of the water channeling channel.
Optionally, determining a water channeling well and a water injection well in the water channeling direction in the well group according to the injection-production dynamic response characteristics of the well group, includes:
determining whether a production well of the well group is a water channeling well or not according to the injection-production dynamic response characteristic of the well group;
judging whether a plurality of water injection wells cause the water channeling phenomenon of the water channeling well under the condition that the production well is the water channeling well;
determining the water channeling direction according to the sedimentary microfacies of the development block and the injection-production dynamic response characteristics under the condition that a plurality of water injection wells cause the water channeling phenomenon of the water channeling well;
and determining the water injection well in the water channeling direction according to the water channeling direction.
Optionally, determining a range of the water channeling channel and a water storage pore volume of the water channeling channel according to the fluid production characteristic of the water channeling well, the water absorption characteristic of the water injection well and the formation characteristic data, including:
determining a water channeling layer in a stratum according to the liquid production characteristics of the water channeling well and the water absorption characteristics of the water injection well;
and determining the range of the water channeling channel and the water storage pore volume of the water channeling channel according to the formation characteristic data of the water channeling layer, the liquid production characteristic of the water channeling well in the water channeling layer and the water absorption characteristic of the water injection well in the water channeling layer.
Optionally, determining a water channeling layer in the formation according to the fluid production characteristics of the water channeling well and the water absorption characteristics of the water injection well, including:
and determining a water channeling layer in the stratum according to the liquid production characteristic of the water channeling well and the water absorption characteristic of the water injection well by combining the primary logging interpretation data and the secondary logging interpretation data of the water channeling well.
Optionally, determining the water channeling channel of the water channeling layer and the water storage pore volume of the water channeling channel according to the formation characteristic data of the water channeling layer, the liquid production characteristic of the water channeling well in the water channeling layer and the water absorption characteristic of the water injection well in the water channeling layer, includes:
forming a water phase vector diagram of the water channeling layer according to the stratum characteristic data of the water channeling layer, the liquid production characteristic of the water channeling well in the water channeling layer and the water absorption characteristic of the water injection well in the water channeling layer;
and determining the range of a water channeling channel of the water channeling layer and the water storage pore volume of the water channeling layer according to the water phase vector diagram.
Optionally, determining a deployment position of the steam injection well according to the water channeling channel and the volume of the water storage hole of the water channeling channel includes:
selecting a water channeling layer to be developed according to the range of all water channeling channels and the volume of water storage pores of the water channeling channels;
and determining the deployment position of the steam injection well according to the range of the water channeling channel of the water channeling layer to be developed.
Optionally, determining a deployment position of the steam injection well according to a range of the water channeling channel of the water channeling layer to be developed includes:
determining a translation direction according to the direction of a water channeling channel of a water channeling layer to be developed;
determining a translation distance according to the range of a water channeling channel of a water channeling layer to be developed;
and taking the water injection well as an origin point, and taking a selected position after the translation direction moves the translation distance as a deployment position of the steam injection well.
In another aspect, the present description provides a method for converting a reservoir from water flooding to steam flooding, comprising:
determining a water channeling well and a water injection well in the well group in the water channeling direction according to the injection-production dynamic response characteristics of the well group;
determining the range of a water channeling channel and the water storage pore volume of the water channeling channel according to the liquid production characteristics of the water channeling well, the water absorption characteristics of the water injection well and the formation characteristic data;
determining the deployment positions of a stratum to be developed and a steam injection well according to the range of the water channeling channel and the volume of a water storage pore of the water channeling channel;
setting steam drive operation parameters according to the oil layer utilization condition of the stratum to be developed and the water storage pore volume of a water channeling channel;
and carrying out steam flooding development on the water channeling layer to be developed by the steam injection well according to the steam flooding operation parameters.
Optionally, set for steam flooding operating parameter according to the oil reservoir condition of using of the water channeling layer of awaiting development and water pore volume, include:
and determining whether water needs to be drained or not according to the volume of the water storage pore of the water channeling channel in the water channeling layer to be developed, and determining the time for converting water drive into steam drive according to the oil layer utilization condition of the water channeling layer to be developed and the volume of the water storage pore.
Optionally, the steam flooding development of the water channeling layer to be developed by the steam injection well according to the steam flooding operation parameters includes:
and under the condition that the water needs to be drained, the water injection well is adopted to assist in draining the water channeling channel in the water channeling layer to be developed.
According to the method for determining the deployment position of the steam injection well, the characteristics of a water channeling channel in the stratum are determined according to the injection and production dynamic response characteristic data of the water channeling well and the water injection well in combination with the stratum characteristic data, the steam flooding development cost of the oil reservoir in the corresponding stratum is determined according to the characteristics of each water channeling channel, the deployment position of the steam injection well is set in combination with the steam flooding development cost of the oil reservoir in each stratum, the steam flooding exploitation of the heavy oil reservoir in the stratum with the exploitation value is realized, meanwhile, the absorption of steam heat by the stored water of the water channeling channel is reduced, and the utilization efficiency of the steam heat energy is improved.
Drawings
FIG. 1 is a schematic diagram of a method for determining a deployment location of a steam injection well according to one embodiment;
FIG. 2 is an overall schematic diagram of an embodiment providing well groups and depositional microfacies in a formation;
FIG. 3 is a flow chart of determining water channeling extent and water holding pore volume provided by one embodiment;
FIG. 4 is a schematic diagram of a water injection well water absorption profile and a water channeling well fluid production profile provided by an embodiment;
FIG. 5 is a schematic diagram of a comparison between primary and secondary well log interpretation data;
FIG. 6 is a schematic illustration of an embodiment providing for determining a location of deployment of a steam injection well based on a range of water channeling;
FIG. 7 is a flow diagram of a method for converting a reservoir from water flooding to steam flooding provided by an embodiment;
FIG. 8 is a flow diagram of a specific waterflood development block to steam flooding development according to one embodiment;
FIG. 9 is a water phase vector field diagram between a water injection well and a water channeling well provided by an embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
As will be understood from the description of the background art, for a reservoir developed using water flooding, if a large amount of heavy oil is included in the reservoir, it may be necessary to recover the heavy oil using steam flooding after water flooding. When the steam flooding mining is adopted, if steam is directly injected into the stratum and then enters the water channeling channel of the stratum, a large amount of heat contained in the steam can be absorbed by water stored in the water channeling channel, and the reduction of the heat for effectively heating the oil reservoir is caused. Therefore, in order to improve the steam heat energy utilization efficiency of steam flooding exploitation, the deployment position of the steam injection well and the reasonable process parameters of the steam injection well need to be optimally designed according to the stratum characteristics in the operation block after water flooding exploitation.
The embodiment of the application provides a method for determining the deployment position of a steam injection well, which is used for selecting the deployment position of the steam injection well according to the water storage characteristic condition of a stratum in a water drive operation block.
FIG. 1 is a schematic diagram of a method for determining a deployment location of a steam injection well according to an embodiment. As shown in fig. 1, the method provided by the present embodiment includes steps S101-S103.
S101: and determining a water channeling well and a water injection well in the water channeling direction according to the injection-production dynamic response characteristics of the well group.
In the water injection operation block, a water injection well and a production well form a well group according to a preset arrangement mode; the stratum pressure is increased by injecting water to the stratum through the water injection wells in the well group, so that the oil reservoir in the stratum flows to the side of the production well.
And if the stratum has geological regions with similar characteristics such as a sediment riverway, the water injection well and the production well are both in the scope of the sediment riverway, and the water injection operation enables the sediment riverway to be communicated to form a channel (namely a water channeling channel) for high-pressure water to flow fast, and high-pressure water injected by the water injection well directly flows to the water injection well through the water channeling channel without playing a role of water drive.
And judging whether the production well is a water channeling well or not according to the injection and production dynamic response characteristics of the operation wells in the well group. For example, without throughput or other stimulation, a production well may be identified as a water channeling well when the fluid production capacity of the production well reaches 1.5 times that before the waterflood operation and the fluid production water content of the production well rises to a particular value, such as 95%.
After the water channeling well is determined, the water injection well in the water channeling direction can be determined according to the injection and production dynamic response characteristics of the water injection well and the water channeling well in the well group. For example, if a water injection well increases the amount of water injected, and the amount of fluid production and the water content of the fluid production of the water channeling well correspondingly increase, it may be determined that the water injection well is likely to be a water injection well in the direction of water channeling.
In practical application, the problem of multidirectional water channeling may occur in a well group, that is, the water injection amount of a plurality of water injection wells and the liquid production amount characteristic of the water channeling well can be in a correlation relationship, and the water channeling phenomenon can occur in the water channeling well due to water injection of each water injection well. In order to determine the water injection well in the general water channeling direction, the water channeling direction of a water channeling channel in the stratum needs to be determined according to the sedimentary microfacies of the stratum, and then the water injection well in the water channeling direction needs to be determined.
FIG. 2 is an overall schematic diagram of an embodiment providing well groups and depositional microfacies in a formation. As can be seen in connection with fig. 2, the general flow direction of the sedimentary canal in the formation can be determined from the sedimentary microsequence; determining the water channeling direction according to the flow direction of the sedimentary river channel and the positions of the water injection well and the water channeling well in the sedimentary river channel; then, the water injection well in the water channeling direction (or the water channeling channel) can be determined according to the water channeling direction and the water channeling well. Regarding the direction of the sedimentary river, the water injection well in the flow direction of the sedimentary river is the water injection well in the water channeling direction.
In addition, in some applications, only one water injection well in the well group has a correlation between the liquid production amount and the water production water content of the water channeling well, so that the water injection well can be directly determined to be the water injection well in the water channeling direction.
S102: and determining the range of the water channeling channel and the volume of a water storage pore of the water channeling channel according to the liquid production characteristics of the water channeling well, the water absorption characteristics of the water injection well and the stratum characteristic data.
After the water channeling well and the water injection well in the water channeling direction are determined, the historical liquid production characteristics of the water channeling well, the historical water absorption characteristics of the water injection well and the stratum characteristic data of an operation block are obtained, and the range of a water channeling channel in the stratum and the water storage pore volume of the water channeling channel are determined through simulation deduction of a data model.
The water producing characteristic of the water channeling well is the water producing characteristic of the water channeling well in the depth direction, the water absorbing characteristic of the water injection well is the water absorbing characteristic of the water injection well in the depth direction, and the water producing characteristic and the water absorbing characteristic can reflect the water absorbing and water storing characteristics of each stratum; by combining with formation characteristic data and utilizing the historical statistical data of the liquid production characteristic and the water absorption characteristic, the range of the water channeling channel and the water storage pore volume of the water channeling channel can be determined by utilizing a numerical simulation method.
S103: and determining the deployment position of the steam injection well according to the range of the water channeling channel and the volume of a water storage hole of the water channeling channel.
After the range of each water channeling channel and the volume of the water storage pore of each water channeling channel are determined, the characteristics of the water channeling channels in each stratum in the whole operation block can be determined; the reservoir development costs in the water breakthrough paths in certain formations may be determined by combining the water breakthrough path characteristics of all the formations in the work zone. The deployment position of the steam injection well in the operation zone can be determined by integrating the oil reservoir development cost and the oil liquid yield of all the strata.
The method comprises the following steps of determining whether a stratum where a water channeling channel is located is a strong water flooded layer, a weak water flooded layer or a non-water flooded layer according to the volume of water storage pores of the water channeling channel; the weak water flooded layer and the non-water flooded layer have development value because of less water storage.
According to the method for determining the deployment position of the steam injection well, the characteristics of the water channeling channel in the stratum are determined according to the injection and production dynamic response characteristic data of the water channeling well and the water injection well and the stratum characteristic data, the steam flooding development cost of the oil reservoir in the corresponding stratum is determined according to the characteristics of each water channeling channel, and the deployment position of the steam injection well is set according to the steam flooding development cost of the oil reservoir in each stratum. By adopting the steam injection well at the deployment position and combining reasonable steam flooding process parameters, the steam heat can be reduced as much as possible to be absorbed by the stored water of the water channeling channel while realizing steam flooding exploitation of the heavy oil reservoir in the stratum, and the utilization efficiency of the steam heat is improved.
Fig. 3 is a flow chart of determining water channeling extent and water holding pore volume provided by one embodiment. As shown in fig. 3, in an alternative embodiment, the method for implementing the foregoing step S102 may include steps S201 and S202.
S201: and determining a water channeling layer in the stratum according to the liquid production characteristic of the water channeling well and the water absorption characteristic of the water injection well.
In the working block operated in the embodiment of the application, the stratum has obvious layering characteristic. Some of these formations do not have good pore characteristics and are unlikely to develop into water channeling layers. In practical application, in order to reduce data processing amount, which of the stratum is the water channeling layer can be determined according to the liquid production characteristics of the water channeling layer and the water absorption characteristics of the water injection well, and then the characteristics of the water channeling channel can be obtained by carrying out numerical simulation on the water channeling layer.
Determining a water channeling layer according to the liquid production characteristics of the water channeling well and the water absorption characteristics of the water injection well, determining which layers in the stratum are layers with large water absorption rate or water absorption capacity, and which layers are corresponding layers with large liquid production capacity and large liquid production water content, and taking the stratum as the water channeling layer.
Fig. 4 is a schematic diagram of a water absorption section and a water channeling well fluid production section of the water injection well provided by the embodiment. Through the correlation of the two, it can be seen that the water absorption of some stratum in the water injection layer is very large, and the liquid production of the corresponding layer in the water channeling well is very large, so that the layer can be determined to be the water channeling layer.
In practical application, the water channeling layer in the stratum can be determined by using the liquid production characteristic of the water channeling well and the water absorption characteristic of the water injection well and combining the primary logging interpretation data and the secondary logging interpretation data of the water channeling well as assistance. FIG. 5 is a schematic diagram of a comparison between primary and secondary well log interpretation data.
The primary logging interpretation data is logging interpretation data when a production well (serving as a water channeling well) is deployed; the secondary well logging interpretation data are well logging interpretation data formed by re-exploring the water channeling well. The two logging interpretations have resistivity characteristic data of each stratum. If the water yield of a certain stratum of the water channeling well is greatly increased, the resistivity of the corresponding stratum is reversely reduced, so that the resistivity of the stratum is greatly reduced in the two well logging interpretation data, the stratum can be generally determined as a water channeling layer; namely, the primary logging interpretation data and the secondary logging interpretation data can be used for assisting in determining the water channeling layer.
S202: and determining the range of the water channeling channel and the volume of a water storage pore of the water channeling channel according to the stratum characteristic data of the water channeling layer, the liquid production characteristic of the water channeling well in the water channeling layer and the water absorption characteristic of the water injection well in the water channeling layer.
After a certain stratum is determined to be a water channeling layer, numerical simulation can be carried out on the stratum, and the range of a water channeling channel of the stratum and the volume of a water storage pore of the water channeling channel are determined by utilizing stratum characteristic data, the liquid production characteristic of a water channeling well in the stratum and the water absorption characteristic of a water injection well in the stratum; the range of all water channeling channels and the volume of the water storage pores are integrated to determine the characteristics of all water channeling channels in the operation block. Of course, the water channeling passage referred to herein may be a water channeling passage whose water channeling amount reaches a certain level.
In step S202, for a certain water channeling layer, a water phase vector diagram of the water channeling layer may be formed according to the formation characteristic data, the liquid production characteristic of the water channeling well in the water channeling layer, and the water absorption characteristic of the water injection well in the water channeling layer, and the range of the water channeling channel of the water channeling layer and the water storage pore volume of the water channeling layer are determined by the water phase vector diagram.
Of course, in the case of sufficient data processing capability, all strata can be directly processed without identifying water channeling layers in the strata, and the range of all water channeling channels and the corresponding water storage pore volume can be obtained.
In the foregoing, it is mentioned that a stratum having development value is selected, that is, a water channeling layer having development value is selected according to the range of the water channeling passage and the water storage pore volume of the water channeling passage, and the water channeling layer is called a water channeling layer to be developed. Subsequently, the deployment position of the steam injection well is determined according to the range of the water channeling channel of the water channeling layer to be developed.
FIG. 6 is a schematic illustration of an embodiment providing for determining a location of deployment of a steam injection well based on a range of water channeling. As shown in FIG. 6, in one embodiment, determining the deployment location of the steam injection well may employ steps S301-S303.
S301: and determining the translation direction according to the direction of the water channeling channel of the water channeling layer to be developed.
S302: the translation distance is determined according to the range of the water channeling passage of the water channeling layer to be developed.
S303: and taking the water injection well as the origin, and taking the position selected after moving the translation distance in the translation direction as the deployment position of the steam injection well.
In order to minimize the absorption of the heat of the steam-driven steam by the water stored in the water channeling channel, the steam injection well should be located as far away as possible from the central region of the water channeling channel, but at the edge region of the water channeling channel or away from the water channeling channel; therefore, the embodiment of the application takes the water injection well as the origin to move towards the water channeling direction vertical to the water channeling channel, and the deployment position of the steam injection well is determined; and, the translation area is determined according to the range of the water channeling passage to keep the steam injection well as far away from the water channeling passage as possible.
It should be noted that the foregoing determination of the translation direction and the translation distance is only a preferred solution, and in other embodiments, the deployment position of the steam injection well may be determined by a technician based on the range of the water channeling paths of the respective strata. Alternatively, the deployment location of the steam injection well may be determined by modeling to find an optimal solution.
FIG. 7 is a flow chart of a method for converting a reservoir from water flooding to steam flooding according to an embodiment. The method for converting water drive to steam drive of an oil reservoir provided by the embodiment is a steam injection well determined based on the method for determining the deployment position of the steam injection well. As shown in FIG. 7, the method for converting oil reservoir from water drive to steam drive comprises steps S501-S505.
S501: and determining a water channeling well and a water injection well in the water channeling direction according to the injection-production dynamic response characteristics of the well group.
S502: and determining the range of the water channeling channel and the volume of a water storage pore of the water channeling channel according to the liquid production characteristics of the water channeling well, the water absorption characteristics of the water injection well and the stratum characteristic data.
S503: and determining the deployment positions of the stratum to be developed and the steam injection well according to the range of the water channeling channel and the volume of the water storage hole of the water channeling channel.
The foregoing steps S501 to S503 can be implemented in a specific manner, and are not described herein.
S504: and setting steam drive operation parameters according to the oil layer utilization condition of the stratum to be developed and the water storage pore volume of the water channeling channel.
The setting of steam drive operation parameters according to the oil layer utilization condition of the layer to be developed and the water storage air of the water channeling channel at least comprises the following (1) to (4).
(1) And determining whether to carry out steam flooding development on the corresponding stratum or not according to the water storage pore volume of the water channeling channel.
(2) And (4) determining whether water drainage is needed or not according to the pore volume of the water starting and storing for the stratum to be developed, and performing steam flooding development after water drainage.
(3) And aiming at different strata, sectional steam flooding development or simultaneous steam flooding development is adopted.
(4) And determining the optimal time for driving and transferring according to the oil layer utilization condition and the water storage pore volume of the stratum to be developed.
In addition, there are other steam flooding operating parameters, such as steam injection rate per unit volume, bottom hole quality, injection-production ratio, etc., which may be based on empirical parameters or by small area optimization experiments.
S505: and carrying out steam flooding development on the water channeling layer to be developed by the steam injection well according to the steam flooding operation parameters.
And step S505, according to the operation parameters determined in the step S504, injecting steam into the steam injection well, and obtaining oil deposit production liquid from the production well.
In actual operation, aiming at a region with low oil layer exploitation degree, in order to enable a stratum oil reservoir to flow to a production well under the action of pressure difference, the production well can be stimulated and stimulated for 2-3 periods, so that the temperature among wells reaches the temperature enabling the heavy oil reservoir to flow, and then steam drive development is carried out.
FIG. 8 is a flow chart of a specific waterflood development block to steam flooding development according to one embodiment. Referring to FIG. 8, the exemplary implementation includes steps S601-S608.
S601: and determining the water channeling wells in the well group according to the injection-production dynamic response characteristics of the well group.
In this embodiment, the operation block is a five-point water-flooding well pattern of an 83m injection-production well zone. And determining the water channeling well by combining the change of the water injection rate of the water injection well, the change of the liquid production rate of the production well and the change of the water content of the liquid production of the production well according to the production dynamic curve of the well group. Wherein, the standard for judging the water channeling well comprises that under the condition of no swallowing and spitting and no other production increasing measures, the liquid production amount of the production well is increased to 1.5 times of that before water flooding, and the water content of the liquid production of the production well reaches 95 percent.
S602: judging whether a plurality of water injection wells which enable the production wells to become water channeling wells exist or not; if yes, go to S603; if not, go to S605.
Step S602 is to inject water into a plurality of production wells, and check whether the fluid production status of the water channeling well changes accordingly. If so, it is determined that the plurality of water injection wells affect the water channeling well, and thus S603 is performed. If not, determining that only one water injection well influences the water channeling well, and executing S604.
S603: drawing a well group well pattern on a sandstone group sedimentary facies diagram; determining whether the water injection well and the production well are in the same phase zone according to the sandstone sedimentary facies diagram; if yes, go to step S604.
S604: the water channeling directions of the water injection well and the water channeling well are determined according to the sandstone sedimentary facies map, and then S605 is performed.
S605: and determining the range of the water channeling channel and the volume of a water storage pore of the water channeling channel according to the liquid production characteristics of the water channeling well, the water absorption characteristics of the water injection well and the stratum characteristic data.
Specifically, step S605 determines a water channeling layer in the formation according to the liquid production characteristic of the water channeling well and the water absorption characteristic of the water injection well by combining the primary logging information and the secondary logging information of the water channeling well; simulating according to the liquid production characteristic of the water channeling layer at the water channeling well, the water absorption characteristic at the water injection well and the stratum characteristic data to form a water phase vector diagram of the stratum and the water pore volume of the water channeling channel; the water phase vector diagram represents the range of water channeling channels and the water channeling direction in the water channeling layer.
Fig. 9 is a water-phase vector field diagram between a water injection well and a water channeling well, provided by an embodiment, which embodies the developmental characteristics of water channeling pathways in different formations.
S606: and determining the deployment position of the steam injection well according to the range of the water channeling channel and the volume of a water storage hole of the water channeling channel.
Step S606 is to determine which strata have the steam-driven development value by using the water-phase vector diagram representing the range of the water channeling passage and the water storage pore volume of the water channeling passage generated in step S605, and determine the deployment position of the steam injection well by combining the range of the water channeling passage and the water storage pore volume of the strata having the development value.
In the embodiment of the application, according to the range of the water channeling channel and the volume of the water storage pore space, the injection-production ratio of steam flooding is ensured, and the deployment position of the steam injection well is determined by adopting 118m large well spacing reverse nine-point well pattern deployment. The deployment position of the steam-drive steam injection well on the plane avoids the original water injection well and translates towards the direction vertical to the water channeling channel.
S607: and setting steam drive operation parameters according to the oil layer utilization condition of the stratum to be developed and the water storage pore volume of the water channeling channel.
In the embodiment of the application, water is linearly discharged in the area with the water storage pore volume exceeding 0.2 according to the characteristic of the water channeling channel of the stratum, and steam drive development is carried out by selecting a better transfer drive time according to the oil layer use condition and the water storage pore volume. In the embodiment of the application, in the longitudinal direction, the combined segmented steam flooding is carried out according to the size of the water channeling layer water storage pore volume: the combined thickness is 15-20m, the net total ratio is more than 40%, the permeability grade difference is less than 4, and the strong water flooded layer and the weak water flooded layer are combined separately. And for the area with lower utilization degree, the well is driven after the temperature between the wells reaches 55-70 ℃ after the water channeling well is stimulated for 2-3 periods.
The steam flooding operation parameters set by the embodiment of the application further comprise: the steam injection rate per unit volume is 1.6 t/d.ha.m, the dryness of the well bottom can be kept in the range of 40-50%, and the production-injection ratio is controlled to be 1.0-1.2. It should be noted that the aforementioned parameters should ensure the expansion of the steam cavity and the internal pressure of the oil reservoir, and inhibit the invasion of the formation water.
S608: and carrying out steam flooding development on the water channeling layer to be developed by the steam injection well according to the steam flooding operation parameters.
The following table shows a production condition simulation comparison table of the embodiment and a current steam injection well production condition simulation comparison table, which reflects that compared with a method adopting a water injection well as a steam injection well, the method provided by the embodiment can greatly improve the effective production time, the stage output production and the stage oil-gas ratio, namely can improve the energy consumption of steam flooding exploitation.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features may be interchanged with other features disclosed in this application, but not limited to those having similar functions.
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