JPH0324959B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for automatically measuring the length of strings in well drilling operations and offshore oil drilling operations.

[Conventional technology]

In well drilling and oil drilling operations, various workpieces such as drill pipes, drill collars, casing pipes, and tubing pipes of different thicknesses, lengths, and materials are connected to form strings, and drilling is performed at the tips of the strings. Attach the appropriate bit and excavate. The length of this string, or the depth of excavation, can reach more than 6000 m. In this case, excavation should be carried out under optimal conditions according to the strata that have been physically logged in advance;
In order to reliably predict when the tip of the string will reach the bottom of the mine, or to take appropriate measures in the event of a blowout or other emergencies, the length of the string must be known at all times. This is extremely important.

Furthermore, the work of connecting or disconnecting the workpiece to the strings is performed by confirming, based on the length information of the strings, that the connecting portion is located at a predetermined length from a fixed point. For example, a work deck surface is selected as this fixed point. If the position signal is automatically sent when the connection surface between the workpiece and the strings reaches this predetermined length position, it will be possible to automate the work such as connecting or disconnecting the workpiece and the strings. It becomes possible to transmit operation timing signals such as operation start and stop signals for operating various machines.

However, the conventional method for determining the length of strings is for workers to measure the length of each workpiece with a tape measure, record the length, write it on the workpiece using paint, etc., and then connect the strings. Sometimes we add this,
Separation was done by a method of subtraction, and was dependent on human power. Also, when measuring the length up to the middle of the workpiece, read the scale on the workpiece that has been marked in advance or read the Kelly scale and add it.
A subtraction method was used.

[Problem that the invention seeks to solve]

The conventional string length measurement method described above often causes errors. For example, misreading the tape measure scale,
Errors occur due to misreading of records, calculation errors, and key input errors.

Furthermore, measuring the length of the workpieces manually not only requires labor, but also poses a risk of the workpieces stacking up and collapsing.

The present invention eliminates such manual work, enables accurate length measurement at all times, enables generation of timing signals to automatic machines for automatic connection and disconnection of worms, and also allows string tips to be adjusted in real time. It is an object of the present invention to provide a method that enables accurate real-time measurement and monitoring of the length from the bit part, that is, the depth of excavation in oil drilling work, etc., and enables smooth progress of the work.

[Means for solving problems]

The present invention has taken the following technical means to solve the above problems.

(1) The handler that connects the strings moves on the vertical guide rail, and is equipped with a position detection sensor that detects the amount of movement, and this sensor sends a handler position signal in the form of an analog or digital signal.

(2) The handler grips the workpiece and the handler so that their mutual positional relationship is always constant, and the handler is equipped with a gripping confirmation sensor.

(3) The handler is equipped with a fixed point distance measurement sensor that measures the distance from the fixed point to the handler at any time.

(4) The handler is equipped with a sensor that detects the vertical movement direction. This sensor can be replaced by the difference calculation of the fixed point distance measuring sensor.

(5) Signals from the sensors (1) to (4) above, i.e., the gripping confirmation signal of the workpiece gripping sensor, the measurement signal of the separation distance of the handler from a fixed point measured by the distance measurement sensor, and the movement by the longitudinal position detection sensor. The distance signal, the correction signal by comparing the value with the above value, and the direction indication signal of the vertical direction detector are input to the computer, and based on these signals, the computer converts the distance measurement sensor measurement signal into the distance traveled by the position detection sensor. The above correction value is added or subtracted from the already stored string length in response to the descending or ascending direction instruction signal of the vertical direction detector, and the depth signal is sent for calculation in real time. do.

[Effect]

The operation will be explained with reference to FIG. 1, taking as an example the length measurement when extending strings.

(a) An ON signal issued by the gripping confirmation sensor 1 when the workpiece gripping section 9 grips the workpiece 20;
By comparing the weight data signal determined by the gripping confirmation sensor 2 that outputs the difference between the weight of the workpiece 20 and the weight of the strings, it is confirmed that the workpiece gripping section 9 reliably grips the workpiece 20.

(b) When the handler 7 starts to descend, the position detection sensor 3 transmits a position signal corresponding to the relative position between the guide rail 10 and the handler 7, and the vertical direction detector 6 detects that the handler 7 is surely descending. After confirmation, an instruction for integration is given to the computer 11.

(c) The fixed point distance measurement sensor 8 continuously measures the distance from the same level as the end of the workpiece 20 held by the workpiece gripping section 9 to the floor level 21 (fixed point) and inputs the measured distance to the computer; Work 2
The position at which the end of zero descends from the fixed point 21 is constantly compared with the set value, and when these match, a signal to stop the descent is sent to the handler 7.

(d) In this case, the length of the workpiece 20 is measured by measuring the amount of movement of the handler 7 from the point at which the workpiece gripping section 9 completely grips the workpiece 20 from this fixed point to the above-determined stopping point of the handler 7. The integrated value becomes the length of the workpiece 20 as it is.

(e) Measurement of the length from the second part of the workpiece 20 is performed from the time when the workpiece gripping section 9 completely grips the workpiece 20, when the handler 7 starts descending and stops at the fixed point 21 as described above. The integrated value of the amount of movement up to the point becomes the length of the workpiece 20 as it is.

(f) The length of each workpiece is stored in each memory device by assigning an address.

(g) At the same time, the value obtained by integrating all these values is sent out as a display signal.

(h) Perform repeated length measurements based on the integrated value of the position sensor 3 and the signal of the fixed point distance measurement sensor 8,
A system for checking accuracy is included in each functional block, and when an error occurs, the actual position of the position sensor is corrected by the measured value of the fixed point distance measuring sensor.

In addition, the above-mentioned five signal processes are performed inside the computing machine to maintain measurement accuracy, improve stability, cancel fixed errors, etc.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the present invention for an oil drilling operation, and FIG. 2 is a flowchart of the system.

Handler guide section 7 along guide rail 10
A position sensor 3 is installed on a handler 7 that moves while being guided by a. As the position sensor 3, a device can be used that detects the position of the handler from an encoder output signal obtained by the rotation of a pinion 5 that rotates while meshing with a rack 4 provided on the guide rail 10. This can also be done using a combination of Magnescale, magnetic sensors, and others.

The handler 7, which had continued digging by grasping the terminal end of the string that is digging through the floor base, stops descending when it reaches a certain distance from the floor base 21, which is a fixed point. A fixed point distance measuring sensor 8 measures the distance of the handler 7 from the fixed point 21 and sends this value to a computing device 11 such as a computer.

When the workpiece gripping section 9 of the handler 7 completely releases the workpiece 20, OFF signals from the gripping confirmation sensors 1 and 2 are sent to the computer 11.

The handler 7 rises to pick up a new workpiece 20, receives the workpiece 20 from the arm that supplies the workpiece 20, grasps the end of the workpiece, and connects the tip of the workpiece 20 to the end of the strings 22. At this point, the fixed point distance measurement sensor 8 measures the distance of the handler 7 from the fixed point and sends the measured value to the computer 11. On the other hand, the gripping confirmation sensors 1 and 2 transmit gripping confirmation signals for the workpiece 20 to the computer 11.

A position signal transmitted from the position detection sensor 3 in accordance with the movement of the handler 7 is detected by the direction detector 6, switched to a positive or negative signal, and sent to the computer 11 at all times.

The grip confirmation sensor 1 sends a signal to confirm the grip force in the horizontal direction, and the grip confirmation sensor 2 sends a signal to the computer 11 to confirm the holding force in the gravitational direction. The calculator 11 has the same functions as a microcomputer, and performs storage, calculation, comparison, and calculation, and processes the above-mentioned signals to determine the position signal to be added, the position signal to be subtracted, and the length measurement out of the movement amount of the handler 7. The system selects and integrates unrelated position signals and transmits a signal of the length (excavation depth) from the tip of the string to a fixed point in real time.

The computing machine 11 can generate a signal indicating the connection point between the works in the strings 22 and a signal shifted forward or backward by an arbitrary length from this signal. Changes can be easily made on the control panel 12 provided in the.

〔Effect of the invention〕

By the method of the present invention, it has become possible to measure the accurate length of strings in real time.
Therefore, it is no longer necessary for the operator to measure the length of each work piece using a tape measure, record it, adjust it, etc., and it is possible to completely eliminate errors and misidentifications that depend on human power. It is also possible to avoid the risk of the workpiece collapsing when the length of the workpiece is measured manually.

In addition, real-time string length measurement information provides reliable drilling depth information.
It is possible to numerically obtain a large amount of information regarding the vertical movement of strings, and it is also possible to determine the string's descent, rising speed, acceleration, etc. from real-time length measurements, and it is possible to determine the various excavation measures that need to be taken based on this information. Work can now be carried out rationally and efficiently.

In addition, the automatic length measurement signal can be used as an operation signal for automatically connecting and disconnecting strings, which also has the effect of contributing to streamlining the entire excavation work.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the method of the present invention, and FIG. 2 is a flowchart of an embodiment of the method of the present invention. 1, 2...Grip confirmation sensor, 3...Position detection sensor, 4...Rack, 5...Pinion, 6...Direction detector, 7...Handler, 8...Fixed point distance detection sensor, 9...Work Gripping part, 10... Guide rail, 11... Computing machine, 20... Workpiece, 21...
...Fixed point (floor base), 22...Strings.

Claims (1)

[Claims] 1 The handler that performs the string connection operation is equipped with a workpiece gripping confirmation sensor, a strings longitudinal position detection sensor, a vertical direction detector, and a distance measurement sensor between the handler position and a fixed point, and when attaching or detaching the workpiece at the terminal end of the strings. , the work gripping sensor confirms that the handler has gripped the end of the workpiece, the workpiece is lowered or raised while measuring the separation distance of the handler from the fixed point using the distance measurement sensor, and the vertical direction detector determines its moving direction. , the moving distance is detected by the string longitudinal direction position detection sensor, the detected value is corrected by comparing it with the measured value of the distance measuring sensor, and this corrected detected value is detected by the vertical direction detector. A method for measuring the length of strings, characterized in that the length of the strings from a fixed point is calculated in real time by adding or subtracting from an already stored string length in response to a falling or rising signal.