JPH0314990B2 - - 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 that has the effect of filling the water gap is supplied to this water loss location.

Conventionally, the method of supplying this fluid was through pipes that transported the chemical solution after the muddy water that preceded it, creating a so-called multiphase fluid. Due to problems with the rod's durability and the excessive time it takes to raise and lower the rod, a method of introducing capsules filled with a medicinal solution has recently been adopted.

Methods for dispersing the drug solution from the capsule that has reached the hole bottom include a method of destroying the entire capsule, or a method of destroying a portion of the capsule by colliding a destruction weight against an easily breakable wall to form an injection hole. is proposed.

``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. Moreover, it is necessary to provide a destruction mechanism inside the capsule, which complicates the mechanism and reduces the amount of medicinal liquid sealed in the capsule. is a wire to prevent the attached breaking weight from falling off while the capsule is descending.
(which must be recovered) may become entangled, or the weight of the hanging rack may shift within the drug solution due to factors such as the buoyancy of the drug solution inside the capsule, ensuring that the capsule is not destroyed or destroyed at the specified depth.
Injection may not be possible.

"Means for Solving the Problems" and "Operation" The present invention was made in view of the above circumstances, and its gist is that a valve hole is bored in a bottomed cylindrical body,
A hanging rod of a predetermined length is integrally installed on the check valve that covers the valve hole, and the hanging rod penetrates the bottom of the cylinder and is constantly urged downward by a coil spring or the like.
On the other hand, by installing a piston block for extruding a medicinal liquid at the upper end of the cylindrical body, it is possible to provide a capsule which completely eliminates the above-mentioned disadvantages.

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

FIG. 1 is a diagram showing a state of the capsule of the present invention on the verge of diffusion of a drug solution.

In the figure, reference numeral 1 denotes a bottomed cylindrical body that encloses a chemical solution 2 to prevent water loss, and a valve hole 3 for dispersing the chemical solution is bored in the bottom portion 1a.

A check valve 4 is covered in the valve hole 3, and a hanging rod 4a is integrally provided on the lower surface of the check valve 4, and the hanging rod 4a passes through the bottom portion 1a and extends into a cylindrical body of a predetermined length. 1 protrudes from the bottom 1a.

The hanging rod 4a is always urged downward, that is, the valve is urged to close.

In the illustrated example, the coil spring 5 is wound around the protruding portion of the hanging rod 4a, and its lower end is fixed to the rod 4a to urge it downward.

In the figure, 1b is a collision protection frame attached to protect the bottom of the cylinder.

A piston block 6 for extruding the chemical liquid 2 is attached to the upper end of the cylinder 1.

7 in the figure is an O-ring.

There is no extra member such as a breaking weight between the piston block 6 and the check valve 4 that would reduce the volume of the other chemical liquid 2, making it easy to ensure the amount of liquid to be filled.

In addition, 8 in the figure shows a wire line for suspending the cylindrical body 1, and 9 shows a boring hole.

In the case of the capsule of the present invention, when the capsule is lowered into the borehole 9 and collides with the bottom of the hole, the hanging rod 4a is pushed up against the force, opening the check valve 4, and causing the sealed chemical solution to 2 is pushed back by the weight of the piston block 6 through the valve hole 3 and quickly flows out and diffuses.

"Effects of the Invention" The various effects of the capsule of the present invention are listed below.

(i) The mechanism prevents the check valve from opening when the capsule reaches the bottom of the borehole, so the chemical solution can reliably flow out at the bottom of the borehole and water can be stopped.

(ii) There is no need for a mechanism to destroy the capsule.

(iii) Capsules can be used repeatedly.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a state of the capsule of the present invention on the verge of diffusion of a drug solution. DESCRIPTION OF SYMBOLS 1...Bottomed cylinder, 1a...Bottom part, 1b...Anti-collision impact protection frame, 2...Drainage prevention chemical solution, 3...Valve hole, 4...Check valve, 4a...Drooping rod, 5...
Coil spring, 6... Piston block for extrusion, 7... O-ring, 8... Wire line, 9...
...Borehole.

Claims (1)

[Claims] 1. A valve hole is drilled in a bottomed cylinder, a hanging rod of a predetermined length is integrally installed on the check valve that covers the valve hole, and the hanging rod is passed through the bottom of the cylinder and is constantly fixed with a coil spring, etc. A capsule for transporting a chemical solution in a borehole, which is biased downward and has a piston block for extruding a drug solution attached to the upper end of the cylindrical body.