JPH0314992B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to the transport of dissimilar fluids on the ocean floor and in wells.

"Conventional Technology" For example, in oil, geothermal and metal exploration, drilling wells are drilled.

However, since the well is deep, at least 500 to 5,000 meters, water is lost during drilling.

When this occurs, the circulating mud for drilling in the borehole escapes into the ground from the hole wall, and the head of the mud cannot be maintained, which may cause the hole wall to collapse.

Therefore, a chemical solution having the effect of filling the water gap is supplied to this water loss location.

Conventionally, this supply means has been to transport the chemical liquid after the muddy water through an inserted supply pipe, resulting in a so-called multiphase fluid, or to fill a capsule with the chemical liquid. Sometimes a method is used to hang it inside a borehole and transport it to the point where water is lost.

``Problem to be solved by the invention'' However, with any of the above methods, when supplying chemical liquid, once the drilling rod is pulled out,
Since it is necessary to insert the supply pipe or suspend the capsule, extra time and effort are required for pulling the drilling rod each time, so it is decided that the user will take up the task and carry out the work. There are many cases where there is no.

That is, it takes several hours to pull up the drilling rod (the deeper the drilling hole, the longer it takes), and it also takes the same amount of time to lower the drilling rod in succession after the water has stopped.

In addition, in the capsule suspension method, the capsule is lowered on a wire line, but because it is lowered without a guide, it may be difficult to descend smoothly due to the roughness of the hole wall or the angle of the borehole. Furthermore, although the capsule breakage gear that is sent through the wire line after descending also uses the wire line as a guide, it is not a rigid guide, so it may be difficult to expect a smooth descent.

``Means for Solving the Problems'' and ``Operations'' The present invention was made in view of the above-mentioned circumstances, and its gist is that A capsule made of resin such as FRP, which has a magnet around the upper edge and a bottom plate made of an easily destructible material or a heat-melting material, is attached to the drilling rod in such a way that it hugs it, and the capsule hits the rig using the drilling rod as a guide. lower it to
Next, a ring-shaped weight for destruction and recovery equipped with an adsorption magnet is lowered using a wire attached to the excavation rod as a guide, and after dispersing the loading liquid, the capsule is adsorbed and pulled up and recovered by the excavation rod. The point is that it is possible to smoothly and reliably supply the chemical solution while the container is left in place without having to pull it out.

"Example" Hereinafter, this will be described in detail based on example diagrams.

FIG. 1 is an overall perspective view of a capsule loaded with a different type of fluid such as a water loss prevention chemical solution according to the present invention.

In the figure, a capsule 1 loaded with a different type of fluid such as a water loss prevention chemical solution according to the present invention is provided with a drilling rod loose fitting hole in the center so that it can be attached to the drilling rod in a hugging manner. It is a container with a ring-shaped cross section. The illustrated example is one-piece,
The excavation rod is installed from the end, but if it is desired to install from the middle of the rod, it is divided in the vertical direction and the divided parts are removably joined with pins.

Thus, the capsule 1 can smoothly descend into the wellbore using the drilling rod as a guide until it comes into contact with the rig.

The capsule 1 is made of a resin material such as FPR, and has a magnet 2 embedded in its upper periphery. The magnet 2 is for coupling to a messenger member for collecting capsules, which will be described later.

The bottom plate 3 at the bottom of the capsule, which is preferably tapered to reduce resistance during descent, is made of a material that is easily broken by impact, such as glass, or a heat-meltable material.

The heat-melting materials mentioned above are resins that soften and become plastic when heated, such as vinyl chloride resin, vinyl acetate resin, acrylic resin, styrene resin, polyethylene, and cellulose plastics, and the selection of the resin material, thickness, etc. The design comprehensively considers various factors such as the temperature at the depth in the borehole where water loss occurs, the selection of a resin whose softening temperature is at that temperature, the time required for descent, and the softening (melting) time. Determined by For example, the softening (dissolution) temperature of a thermoplastic resin in muddy water is approximately as follows.

Vinyl chloride resin (soft) 40~60℃'' (hard) 60~80℃ Vinyl acetate resin 50~100℃ Acrylic resin 80~150℃ Also, the softening (dissolution) time is approximately 10~30 minutes.Furthermore, The temperature distribution in the borehole is as shown in Figure 2.

Therefore, the drug solution is injected in the open hole mode with the bottom plate 3 not attached, and the drug solution is loaded into the capsule of the present invention with the bottom plate attached and closed. good.

FIG. 3 is an overall perspective view of the ring-shaped weight 4 for destruction and recovery.The ring-shaped weight 4 is designed to lower the excavation hole using the excavation rod as a guide, similar to the capsule 1. Similar to the capsule 1, a divided configuration is also possible.

At the portion of the weight 4 corresponding to the magnet 2, an attraction magnet 5 is disposed.

In the figure, 6 is a wire for hanging the weight 5.

By sending the weight 5 following the capsule 1, the undestructed bottom plate 3 is reliably collided with the rig and destroyed, and the empty capsule 1 is adsorbed and pulled up and collected for reuse. That will happen.

Figures 4a to 4d show the procedure for transporting the drug solution of the present invention,
In the figure, 7 shows a drilling hole, 8 shows a drilling rod, and 8a shows a rig.

First, the capsule 1 is attached to the excavation rod 8 and lowered (Figure a).

The capsule 1 hits the rig 8a and is locked, but in this state, some of the bottom plates 3 made of easily breakable materials may break, and those made of heat-melting materials may dissolve over time and release the chemical solution. By the way,
Subsequently, weight 5 is sent in (Figure b).

The weight 5 collides with the capsule 1 and reliably destroys the bottom plate 3 made of an undestructible and easily destructible material, and magnetically attracts the capsule 1 to become one piece (FIG. c).

By pulling up the wire 6, the capsule 1
(Figure d).

In the present invention, the chemical solution is diffused without pulling out the drilling rod, so if the chemical solution reacts with the slime on the hole plate and solidifies, it is possible that the rig will become unable to rotate.

Therefore, the excavation rod is raised to a predetermined level before the capsule is lowered, and then the capsule is lowered.

Therefore, the chemical solution diffused at a predetermined level above the hole plate descends as a lump toward the water leakage area and solidifies, but this does not cause any problem in restarting the drilling rod.

"Effects of the invention" The effects of the described invention are listed below.

(1) Construction time can be shortened because there is no need to raise or lower the excavation rod.

(2) There is no need to pull up the drilling rod, so if water leakage occurs, the capsule can be lowered immediately and the water stopped. As a result, the amount of muddy water to be replenished for stabilizing the hole wall can be reduced.

(3) Since the capsule is lowered using the excavation rod as the axis, it can be transported to a specified depth (point of water loss) with certainty.

(4) Depending on the state of water loss, several capsules can be put in, discharged, and stopped.

(5) Capsules are easy to handle (replacement of bottom plate and shape).

(6) Cost is also lower because only the bottom plate (damaged part) is replaced.

[Brief explanation of the drawing]

1 and 3 are overall perspective views of the capsule and weight of the present invention, FIG. 2 is a temperature distribution diagram of an excavation hole, and FIGS. 4 a to 4 d are procedural diagrams of the present invention. 1... Capsule, 2... Magnet, 3... Bottom plate, 4
... Weight, 5 ... Weight, 6 ... Wire,
7...Drilling hole, 8...Drilling rod.

Claims (1)

[Scope of Claims] 1. A capsule made of resin such as FRP, which is filled with a different fluid such as a water loss prevention chemical solution, has a magnet arranged on the upper edge of the ring-shaped cross section, and has a bottom plate made of an easily destructible material or a heat-melting material. Attach the rod so that it hugs the drilling rod, lower it until it hits the rig using the drilling rod as a guide, and then attach a ring-shaped weight for destruction and recovery equipped with an adsorption magnet to a wire using the drilling rod as a guide. A method for transporting a different type of fluid on the seabed or in a well, the method comprising: lowering the fluid to diffuse the charging liquid, and then adsorbing the capsule and pulling it up and recovering it. 2 It has a ring-shaped cross section so that it can be attached to the drilling rod, and its bottom plate is made of an easily broken material such as glass or a heat-meltable material, and a magnet is embedded in the upper edge of the material. Destruction and recovery made of a magnetically permeable material suspended by a wire with a ring-shaped cross section that can be attached to a drilling rod in the same way as a resin capsule such as FRP loaded with a different fluid such as a chemical solution to prevent water loss. A device for transporting different types of fluids on the seabed or in wells, consisting of a combination of weights.