JPH01102196A - Multiple type templating packer - Google Patents

Abstract

PURPOSE: To improve the molding efficiency by cutting a pressure release hole in a hollow control side wall between fitting parts of a hollow body, fitting a cylindrical valve to an inner circumferential part of the hollow pipe, and copying the surface of the hole wall by means of small hole at a lower end part or the cylindrical valve through the selective expansion of the hollow body. CONSTITUTION: Molding packers 3, 4 are fitted to a hollow pipe 2 by a metallic flange 5, a hollow part 8 of a hollow body is covered with an expandable material 6 such as a hard rubber, and a copying plate 7 of a soft rubber, etc., is fitted to an outer circumferential surface. A flow hole 9 and a pressure release hole 16 are cut in a wall surface of the hollow pipe 2 to form a ball seat 17a provided with a small hole 13, and a cylindrical valve 10 is locked to an inner wall of the molding packers 3, 4 by a locking part 12. A small ball is dropped in the hollow pipe 2, and the small hole 13 is closed by the small ball by forced feeding of the pressurized fluid, and the copying plate 7 is pressed against the hole wall by the expansion of the lower molding packer 4 to copy the condition of the hole wall. Hole walls at a plurality of arbitrary points can be copied by one drop.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used for earthquake prediction, preliminary investigation in oil drilling, tunnel construction, etc., and investigation of the internal condition of iron pipes, etc. This invention relates to a copying device for the walls of boreholes, etc., for investigating the strike, inclination, etc. of cracks in boreholes.

[Conventional technology]

Conventionally, methods for investigating the internal state of the strata include methods of investigating from the outside using differences in electrical conductivity and sound wave propagation speed, direct investigation of samples collected during boring, and A known method is to insert a camera into a borehole and photograph the borehole wall.

In addition, as shown in Figure 6, in order to determine the state of joints, cracks, and faults within the rock mass, an inflatable cylindrical device laminated with copy plates was inserted into the borehole, and the device was expanded to measure the state of the hole wall. A copying method is also known (Special Publication No. 49-643).

[Problem that the invention seeks to solve]

However, the above-mentioned methods using electrical conductivity and sound wave propagation speed are only rough surveys; the method of investigating collected samples does not allow accurate confirmation of the location of cracks; and the method using cameras also The problem is that it is difficult to take a complete picture if the water is contaminated.

The method described in Japanese Patent Publication No. 49-643 is a method used for boreholes, but it is economically and time-efficient as it can only copy one location in one descent. The problem is that it's bad. In other words, in the case of earthquake prediction or oil exploration, for example, when investigating a borehole at a depth of 1 km, it takes about 5 to 6 hours to descend the 1 km depth while connecting iron pipes. Moreover,
In a normal survey for earthquake prediction, etc., it is necessary to make copies of more than ten locations, so one survey takes about 100 hours.゛The present invention solves these problems, and has the following points:
The purpose of this is to make copies of hole walls at any number of locations possible in just one descent, thereby significantly reducing costs.

[Means for solving problems]

To this end, the multiple mold-making packer of the present invention is a mold-making puffer that copies the surface of the hole wall by lowering a hollow body attached with a copying plate into a borehole, etc., and inflating it by fluid pressure. A cylindrical body made of an expandable material with a copy plate laminated on the outside is fitted into the outer periphery of the passage hole, and both ends A hollow body is formed by attaching to a hollow tube via a brim-shaped flange, and a pressure release hole is bored in the side wall of the hollow tube between the attachment parts of the hollow body, and the pressure relief hole is formed in the inner circumference of the hollow tube. and a cylindrical valve that opens and closes the upper flow hole, and the ball falling inside the hollow tube is selectively received by the small hole at the lower end and the cylindrical valve due to the difference in diameter, and the hollow tube is closed by fluid pressure. It is characterized by copying the surface of the hole wall by expanding the body.

[Effect]

The multiple mold packer of the present invention descends into a borehole, etc., first drops a small ball from the top of the hollow tube to close the small hole at the bottom end of the hollow tube, and then drops the ball from the top of the hollow tube. When a fluid such as gas or liquid is injected to expand the lower hollow body,
The surface of the copying plate can be copied by pressing the copying plate against the wall of a borehole or the like. Furthermore, after the copying is completed, the pressure is lowered to contract the lower hollow body, the packer is moved to the second copying point, and this time the large ball is dropped to push down the hollow cylindrical valve and make the flow hole communicate with the inside of the hollow pipe. At the same time, the hollow part of the hollow cylindrical valve is closed with a large ball. Then, when gas or liquid is again pressurized from the upper part of the hollow tube, the upper hollow body is expanded this time, and the copying plate is brought into pressure contact with the wall of a hole such as a borehole, so that the surface thereof can be copied. After copying is completed, the pressure is lowered to contract the upper hollow body. With such a simple mechanism, the multiple mold-making packer of the present invention can make copies of the hole walls at two locations in the case of two molds.

〔Example〕

Examples will be described below with reference to the drawings.

Fig. 1 is a cross-sectional view of the double mold packer of the present invention, showing the state of descent into a borehole, Fig. 2 is a cross-sectional view showing the copying state at the first point, and Fig. 3 is a cross-sectional view showing the state of duplication at the first point. FIG. 4 is a cross-sectional view showing a state in which the pressure is released, FIG. 4 is a cross-sectional view showing a copying state at a second point, and FIG. 5 is a cross-sectional view showing a state in which the pressure is released and recovered to the ground.

In the figure, 1 is a borehole, 2 is a hollow tube, 3 is an upper mold packer, 4 is a lower mold packer, 5 is a flange, 6 is an expandable material, 7 is a copying plate, 8 is a hollow part of a hollow body, 9 is a communication hole, 10 is a cylindrical valve, 11 is a spring, 12 is a locking part, 13
14 is a small hole provided at the lower end of the hollow tube, 14 is a small ball, 15 is a large ball, 16 is a pressure release hole, 17a is a ball seat, and 17b is a large ball receiving part.

The mold packer 3.4 is attached to the hollow tube 2 by means of a metal flange 5, the hollow part 8 of the hollow body is covered with an expandable material 6, and a copy plate 7 is attached to its outer circumferential surface. As the expandable material 6, a tube made of hard rubber or the like is used.
The copying plate 7 is made of soft rubber or the like and is plastically deformed when pressed against the hole wall, thereby making it possible to copy the state of the hole wall. In other words, any plastic material may be used.

On the wall of the hollow tube 2, there is a hollow part 8 of the molding bunker 3.4.
A communication hole 9 and a pressure release hole 16 are drilled at a position communicating with the mold-making bunker 3 and at a position below the upper mold-making bunker 3. Also,
The lower end of the hollow tube 2 forms a hole sheet 17a with a small hole 13 through which small balls can fall and cool. Further, in the middle of the mold bunker 3.4, a locking part 12 is provided on the inner wall of the hollow tube 2, and a cylindrical valve having a spring 11, a pressure release hole 16, and a large ball receiving part 17b is provided on the locking part 12. 10 is locked. The large ball receiving part 17b receives the large ball when it is dropped from above and blocks the flow of fluid downward. When fluid is pressurized in this state, the spring 11 is compressed and the cylindrical valve is closed. 10 descends.

The pressure release hole 16 communicates with the pressure release hole 16 of the hollow tube 2 at the position where the spring 11 is compressed and lowered, and in this state releases the pressure on the mold packer 4 below.

With the above configuration, a small ball is dropped inside the hollow tube 2,
When a fluid such as water is injected, the small ball closes the small hole 13, so
The lower mold packer 4 expands and the copying plate 7 comes into pressure contact with the hole wall, thereby copying the state of the hole wall. Also, a large ball is dropped,
When the fluid is pressurized, the upper mold packer 3 similarly expands, and the copying plate 7 comes into pressure contact with the hole wall, thereby copying the state of the hole wall.

Next, referring to FIGS. 1 to 5, the working procedure for copying the hole wall will be explained in detail.

First, as shown in FIG. 1, the mold packer 3.4 is lowered into the borehole 1 while connecting the iron pipe. At this time, if there is groundwater, the groundwater is caused to flow into the hollow tube 2 through the small hole 13 at the lower end of the hollow tube as shown by the arrow.

When the ball 14 is lowered to the first point requiring investigation, the small ball 14 is dropped as shown in FIG. 2 to close the small hole 13 of the ball 17a. Then, by pressurizing fluid from the upper part of the hollow tube 2, the inside of the hollow part 8 of the hollow body is pressurized for a predetermined period of time, and the lower mold packer 4 is expanded.
The copy plate 7 is pressed against the hole wall to record unevenness marks on its surface due to joints and cracks in the hole wall.

Next, as shown in FIG. 3, when the pressure is released from the upper part of the hollow tube 2, the lower mold packer 4 contracts due to the restoring force of the expandable material 6. Furthermore, the upper mold packer 3 is moved to a second point that requires investigation.

At the second point, as shown in Figure 4, a large ball 1 is inserted from the top of the hollow tube 2.
5 is dropped, the cylindrical valve 10 is pushed down against the spring 11, and the flow hole 9 is communicated with the hollow tube 2. Then, pressure is applied from the upper part of the hollow tube to expand the upper molding bunker 3, and the second
Record the condition of the hole wall at that point.

As mentioned above, the cylindrical valve 10 has a receiving part 17b for the large ball 15 at its upper end, and the large ball 15 is not received and the hollow part of the cylindrical valve 10 is closed by the large ball 15. Prevent pressure from being applied to the lower mold packer 4. Also, in order to prevent the lower molding bunker 4 from expanding, a cylindrical valve 10 is provided.
A pressure release hole 16 is formed in each of the cylindrical valve 10 and the hollow tube so that the hollow tube communicates with the borehole when the valve is pushed down to the locking part 12. After copying the second point, the pressure is released as shown in Figure 5, and it is recovered to the ground.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above example,
Although a two-stage mold packer is used, a multiple mold packer may be added to form a multi-stage packer. In this case, the inner diameter of the upper cylindrical valve may be made larger than that of the lower one. Furthermore, in the above embodiment, the cylindrical valve is held in a predetermined position by a spring, but it is also possible to hold the cylindrical valve by a simple fastening means such as temporary fastening, and to stop it when it receives a ball. It may be configured so that it can be removed. The purpose of the ball is
Since it functions as a stopper, the stopper may have another shape instead of a sphere as long as it has the same function. Further, in the above embodiment, the wall of a borehole is copied, but it goes without saying that the present invention can be similarly applied to investigating the condition of walls of iron pipes and other tubular objects.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the condition of the hole wall at any plurality of points can be copied in one descent by making the conventional molding backer into a multiple type with a simple mechanism. 1 compared to conventional mold packers.
The time required for each survey can be reduced to just a few minutes.
Mold surveys can be conducted efficiently.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the double molding bunker of the present invention, showing the state of descent into a borehole, FIG. 2 is a cross-sectional view showing the state of copying at the first point, and FIG. 4 is a sectional view showing the state where the pressure is released, FIG. 4 is a sectional view showing the state of copying at the second point, FIG. 5 is a sectional view showing the state where the pressure is released and recovered to the ground, and FIG. 6 is a sectional view showing a conventional molded bunker. DESCRIPTION OF SYMBOLS 1... Borehole, 2... Hollow tube, 3... Upper molding packer, 4... Lower molding backer, 5...
・Flange, 6... Expandable material, 7... Copy plate, 8
... Hollow body hollow part, 9 ... Communication hole, 10 ... Cylindrical valve, 11 ... Spring, 12 ... Locking part, 13 ...
Small hole provided at the lower end of the hollow tube, 14... Small ball, 15...
- Large ball, 16...pressure release hole, 17a...pole seat, 17b...large ball receiving part.

Claims (4)

[Claims] (1) In a mold packer in which a hollow body with a copying plate attached is lowered through a borehole, etc. and expanded by fluid pressure to copy the surface of the hole wall, the side wall of a hollow tube having a small hole at the lower end A cylindrical body made of an expandable material with a copy plate laminated on the outside is fitted into the outer periphery of the passage hole, and both ends are attached to the hollow tube via a brim-like flange. A cylindrical valve that forms a hollow body, has a pressure release hole bored in the side wall of the hollow tube between the attachment parts of the hollow body, and opens and closes the pressure relief hole and the upper communication hole on the inner circumference of the hollow tube. The plug falling through the hollow tube is selectively received by the small hole at the bottom end and the cylindrical valve due to the difference in diameter, and the hollow body is expanded by fluid pressure to copy the surface of the hole wall. A multiple mold packer characterized by having the following structure. (2) The multiple mold packer according to claim 1, characterized in that it is provided with a plurality of cylindrical valves. (3) The cylindrical valve is held in a state where the pressure release hole and the upper communication hole are closed, and a predetermined falling stroke is allowed.When the cylindrical valve receives the plug falling inside the hollow tube, it is pushed down and the upper communication hole and the pressure The multiple type according to claim 1, characterized in that the release hole is communicated with the hollow tube and the inside of the hollow tube between the pressure release hole and the upper communication hole is blocked by a plug. Mold packer. (4) The inner diameter of the hollow part of the cylindrical valve is larger than the diameter of the small hole at the lower end of the hollow tube, and between the cylindrical valves, the inner diameter of the hollow part of the upper cylindrical valve is made larger. A multiple mold packer according to claim 1.