JPH0344616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a capsule for transporting a drug solution in a borehole.

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

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

When this happens, the circulating mud for drilling in the borehole escapes into the ground from the hole wall, making it impossible to maintain the head of the mud and causing the hole wall to collapse.

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

Conventionally, this supply method used pipe transport, in which the chemical liquid was transported after the muddy water that preceded it, resulting in a so-called multiphase fluid, but recently, a method has been adopted in which a capsule filled with the chemical liquid is introduced. I'm getting used to it.

As means for diffusing the drug solution from the capsule that has reached the bottom of the hole, methods have been proposed such as destroying the entire capsule and opening a valve attached to the tip.

``Problem to be solved by the invention'' However, the former method of destroying the entire structure requires a destruction mechanism (bursting device for explosives, etc.) that must be handled with care, and depending on the bursting device, the hole wall may be damaged. In addition, in the case of the latter method of opening the valve at the tip of the capsule, water pressure inside the hole, muddy water,
The valve may not open reliably due to excavation slime, etc.

Furthermore, in addition to the above points, there are few boreholes that are vertical, and in some cases, individual drilling angles of 30 degrees or 45 degrees occur, and the hole wall surface is not a smooth surface but an uneven wall surface. It exhibits the following.

Therefore, in order to ensure a smooth descent of the capsule, the capsule itself must have a guiding ability, and at depths of several hundreds or thousands of meters, high heat and pressure may cause the capsule to have difficulty connecting dissimilar parts. It is hoped that a solution will be found to solve the problem of gaps occurring due to expansion and contraction at joints, resulting in distortion after only one use, and damage to joints of parts, making repeated use impossible. The reality is that there are.

``Means for Solving the Problems'' and ``Operations'' The present invention was made in view of the above circumstances, and its gist is that the inner diameter step enlarged portion is shaped at the lower end of the tip of the wire line. A cylindrical body with a bottom plate made of easily breakable material such as glass, ceramics, reinforced cloth, etc., removably fastened and crimped via short cylindrical screw fasteners is suspended, and a knife edge is protruded from the top surface in front of the cylindrical body. A cutting table is fixedly installed, and a weight for destroying the bottom plate that acts downwardly on the bottom plate is suspended in the upper part of the cylinder,
Assuming that the hanging cord is passed over the cutting table in such a way that it will be cut by the descending impact of the mesh gear attached to the wire line, it will be cut at the desired depth without destroying the hole wall in any way. In addition to providing a capsule that can reliably achieve drug solution diffusion, the screw fastener is made tapered and the cylinder body and the screw fastener are made of the same material, so that the capsule has a guiding ability that allows the capsule to descend quickly. and high fever,
It is an object of the present invention to provide a capsule that can be reused at the joints of parts even under high pressure without causing any inconvenience.

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

1A to 1D show the capsule of the present invention, FIG.
Figure c is a diagram showing another embodiment of the part surrounded by c in Figure A, and diagram d is a diagram of another embodiment of the part surrounded by d in Figure A.

In Fig. a, numeral 1 is a cylindrical body serving as a container into which a water loss prevention chemical solution 2 is loaded, and is a bottomed body having a bottom plate 3 made of an easily breakable material such as glass, ceramics, or reinforced cloth.

The bottom plate 3 is assembled separately from the cylindrical body 1, and is inserted into the stepped inner diameter enlarged part 1a formed at the lower end of the cylinder 1, pressed and locked, and then inserted into the stepped inner diameter enlarged part 1a. Short cylindrical screw fastener 4 to be screwed into the interior
It can be removably assembled by fastening and crimping through the .

The reason why the screw fastener 4 is made into a short cylindrical body is to form the tip of the cylindrical body 1 to ensure a diffusion path for the chemical solution 2 from the bottom plate 3.

In addition, 5 in the figure is a sealing ring inserted in the above-mentioned crimping part.

Above the bottom plate 3, a weight 6 for breaking the bottom plate which provides a falling impact as a breaking means is suspended by a hanging string 7 at a position where a predetermined fall distance is ensured.

In the figure, reference numeral 8 denotes a wire line for suspending the cylinder 1, and the wire line 8 has a cutting table 9 as shown in figure b.
is fixed like a brim, and a knife edge 1 is installed on the top surface.
0 is attached, and the hanging string 7 is passed over this knife edge 10 and fixed 11 to the side surface of the stand.

In the figure, reference numeral 12 is a cylinder-shaped wire line 8 that can be penetrated through the center.As it descends along the wire line 8 from the borehole well, it collides with the knife edge 10, cutting the hanging cord 7 and destroying the bottom plate. The weight 6 falls towards the bottom plate 3, and the bottom plate 3 is destroyed by the impact.
The chemical solution 2 will be diffused into the borehole.

According to the means of the present invention described above, the hole wall is not destroyed by explosion, and the chemical solution diffusion function is not affected by the water pressure, muddy water, excavation slime, etc. in the environment outside the capsule. We can expect reliable spread without any problems.

In addition, heat-resistant materials such as steel and FRP are used for the material of the cylinder 1, but if there is a risk of falling into the hole, it may remain in the hole and hinder drilling, so it must be made of a material that is difficult to break. It is better to avoid steel.

Also, if the inside of the hole is at room temperature or relatively low temperature (below 100°C), PVC or the like is good, and if the temperature is high (100°C or more), FRP or the like is good.

Since the cylindrical body 1 and the short cylindrical screw fastener 4 constitute a joint part, if both are made of the same material, the problems caused by the difference in expansion and contraction mentioned above can be avoided. .

Figure c shows an example of a different measure from that shown in figure a between the chemical solution 2 and muddy water.

That is, in the case of Fig. a, the weight 6 is loosely inserted into the upper end opening of the cylindrical body 1, and the chemical liquid 2 and the external muddy water are directly contacted and communicated through the gap.

Due to this contact, the pressure inside and outside the cylinder 1 is automatically balanced, and destruction due to pressure difference is avoided.

However, when the chemical solution 2 is hydroreactive,
In order to prevent direct contact, as shown in Figure c, a liquid spacer 13 such as a solvent and a heat-resistant film spacer 14 such as aluminum foil are added.
The guide pipe 16 is supported by an arm 15 extending from the upper end opening of the cylindrical body 1 in order to stably support the weight 6, which is interposed as an isolating material and has to be displaced further upward.
A weight 6 is installed inside.

Figure d shows an example in which the tip of the cylindrical body 1 is formed into a tapered shape in order to provide the ability to guide the tube downward into the hole.

[Effects of the Invention] As described above, according to the present invention, it is possible to completely eliminate situations such as destruction of the borehole wall and inability to diffuse the chemical solution, and transport the chemical solution, which is extremely suitable.

Further, after collection, it can be reused by reattaching the bottom plate 3, which is advantageous in terms of cost.

[Brief explanation of drawings]

1A to 1D show the capsule of the present invention, FIG.
Figure c is a diagram showing another embodiment of the part surrounded by c in Figure A, and diagram d is a diagram of another embodiment of the part surrounded by d in Figure A. 1... Cylindrical body, 2... Water loss prevention chemical solution, 3... Bottom plate, 4...
Short cylinder screw fastener, 5...Sealing ring, 6...Weight for destroying the bottom plate, 7...Hanging string, 8...Wire line, 9...Cutting table, 10...Knife edge, 11...Fixing, 12...Messenger, 13...Expectations Spacer, 14...Heat-resistant spacer, 15...Take-out arm, 16...Guide pipe.

Claims (1)

[Scope of Claims] 1. A bottom plate 3 made of an easily broken material such as glass, ceramics, reinforced cloth, etc. is removably attached to a stepped internal diameter portion formed at the lower end of the wire line 8 via a short cylindrical screw fastener 4. The cylindrical body 1 which has been fastened and crimped is suspended, and a cutting table 9 with a knife edge 10 protruding from the upper surface is fixed in front of the cylindrical body 1. A suspension string 7 for suspending a descending weight 6 for breaking the bottom plate was placed in a borehole in such a way that it would be cut by a descending impact of a mesh gear attached to the wire line on the cutting table. Capsules for transporting drug solutions. 2. A capsule for transporting a drug solution in a borehole according to claim 1, wherein the cylindrical body and the short cylindrical screw fastener are made of the same material. 3. A capsule for transporting a drug solution in a borehole according to claim 1 or 2, which has a tapered tip shape.