Testing device for drilling water injection test

Abstract

The utility model discloses a testing device for a drill hole water injection test. The testing device comprises a filter floral tube, a water stop plug, a water injection tube, water supply equipment and an air supply device, the filter floral tube is accommodated in the test section at the lower part of the drill hole and is communicated with the water supply equipment through a water injection pipe and a water stop plug pipeline; and the air supply device is communicated with the water stop plug through an air path. The air pressure type water stop plug is used for stopping water, a sleeve does not need to be inserted into a drill hole, the accuracy of an experiment result is guaranteed while the experiment workload is reduced, the filter floral tube is arranged in the test section, collapse of the test section in the water injection process can be prevented, meanwhile, the pressure measuring tube is arranged, the water level change in the test section can be accurately measured, and the test efficiency and precision are improved.

Description

Technical Field

[0001] The present application relates to the technical field of drilling, and in particular to a testing device for drilling water injection test. Background Art

[0002] The borehole water injection test is an in-situ test method that injects water into the test section through a borehole to determine the permeability coefficient of the rock and soil layer. It can be divided into a borehole constant water head injection test and a borehole reduced water head injection test.

[0003] CN201620457772.2 discloses a drilling water injection test device for measuring the permeability of rock and soil, including: a borehole, a casing, a working pipe, a water stop ring and a bottom cushion layer of the hole. In order to improve the accuracy of the experimental results, it is necessary to set a casing in the borehole, and set a water stop ring between the casing and the working pipe, wherein the outer wall of the casing is close to the inner wall of the borehole, and the bottom of the casing is located at the top of the test section. Due to the need to lower the casing, the casing is relatively long as a whole and fits the inner wall, which increases the workload of lowering the casing on site. It is also time-consuming and labor-intensive to lower the casing after the experiment, which increases the labor intensity and experimental cost during the test.

[0004] The information disclosed in the background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in the field. Utility Model Content

[0005] The present application provides a testing device for a borehole water injection test, which does not require a working casing and uses a pneumatic water-stop plug to complete water stopping. It can quickly complete the borehole water injection test, is suitable for small-diameter boreholes, is easy to operate, has a wide range of applications, and is low in cost.

[0006] The present application provides a testing device for a borehole water injection test, comprising: a filter tube, a water stop plug, a water injection pipe, a water supply device, and an air supply device; the filter tube is accommodated in a test section at the lower part of the borehole, and is connected to the water supply device through the water injection pipe and the water stop plug pipeline; the air supply device is connected to the water stop plug gas circuit.

[0007] Preferably, the filter flower tube comprises: a steel cylinder; and a plurality of through holes are arranged on the side wall of the steel cylinder.

[0008] Preferably, the sum of the through hole areas is 20-30% of the surface area of ​​the steel cylinder side wall.

[0009] Preferably, the water-stopping plug comprises: a center rod, a water-stopping plug capsule, and a first hollow tube; the center rod is sealingly penetrated in the water-stopping plug capsule and is coaxially arranged with the water-stopping plug capsule; the first hollow tube is sealingly penetrated on one side of the water-stopping plug capsule and extends into the filter flower tube; the water-stopping plug capsule is connected to the air supply device.

[0010] Preferably, the water-stopping plug comprises: end iron heads; the end iron heads are arranged in pairs on the top surface and the bottom surface of the water-stopping plug capsule respectively.

[0011] Preferably, one end of the central rod is connected to the water injection pipe; the other end of the central rod is connected to the filter flower tube.

[0012] Preferably, it comprises: an electric flow meter; the electric flow meter is arranged on the water injection pipe.

[0013] Preferably, it comprises: a pressure measuring tube; the pressure measuring tube is inserted into the borehole and communicated with the first hollow tube.

[0014] Preferably, it comprises: a high-pressure air pipe; the high-pressure air pipe is connected with the water supply equipment and the center rod.

[0015] Preferably, the high-pressure air pipe comprises: a rubber inner lining layer, a steel wire reinforcement layer, and a rubber outer covering layer; the steel wire reinforcement layer is arranged on the outer wall of the rubber inner lining layer; and the rubber outer covering layer is arranged on the outer wall of the steel wire reinforcement layer.

[0016] The beneficial effects of this application include:

[0017] 1) The test device for borehole water injection test provided in this application uses a pneumatic water-stop plug to stop water, and there is no need to insert a casing in the borehole, which reduces the experimental workload while ensuring the accuracy of the experimental results. A filter flower tube is provided in the test section to prevent the test section from collapsing during water injection. At the same time, a pressure measuring tube is provided to accurately measure the water level changes in the test section, thereby improving the test efficiency and accuracy.

[0018] 2) The test device for drilling water injection test provided in this application is provided with a water stop plug and a high-pressure gas cylinder connected to the water stop plug is inflated according to the experimental needs. When lowered, it is in an uninflated state, which is convenient to lower, has low operation intensity, and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a testing device for a borehole water injection test in at least one embodiment provided in the present application;

[0020] Figure 2 A schematic diagram of the structure of a water stop plug in at least one embodiment provided in the present application;

[0021] Figure 3 A schematic cross-sectional view of a high-pressure gas pipe in at least one embodiment provided in the present application;

[0022] Legend:

[0023] Drill hole 1, filter flower tube 2, water injection pipe 3, water stop plug 4, high-pressure gas pipe 5, high-pressure gas cylinder 6, water supply equipment 7, electric flow meter 8, pressure measuring tube 9, water stop plug pressurized hole 41, center rod 42, end iron head 43, first hollow tube 44, water stop plug capsule 45, water inlet hole 421, water outlet 422, rubber lining layer 51, steel wire reinforcement layer 52, rubber outer covering layer 53. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0026] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in the field, and can be implemented in a variety of common knowledge settings.

[0027] See also Figures 1 to 3 The test device for drilling water injection test provided in the present application includes: a borehole 1, and the borehole 1 includes: a test section and a non-test section; the test section is located at the bottom of the borehole and contains a filter tube 2. The water injection pipe 3 is used to supply water to the test section, and one end of the water injection pipe 3 is connected to the water supply equipment 7 pipeline, and the other end is connected to the filter tube 2. The cross-section of the pneumatic water-stop plug 4 is annular, and the pneumatic water-stop plug 4 is a rubber tube. The pneumatic water-stop plug 4 includes: a water-stop plug capsule 45, a center rod 42, a first hollow tube 44, and an end iron head 43; the top and bottom of the water-stop plug capsule 45 are covered with the end iron head 43; the center rod 42 passes through the water-stop plug capsule 45 and is arranged on the central axis of the water-stop plug capsule 45;

[0028] The high-pressure gas pipe 5 connects the high-pressure gas cylinder 6 with the pressure hole 41 of the water stop plug; the electric flow meter 8 is arranged on the water injection pipe 3 to realize the measurement. The pressure measuring tube 9 is used to test the water level of the test section. One end of the pressure measuring tube 9 extends out of the borehole 1, and the other end passes through the first hollow tube 44 and extends into the test section.

[0029] In a specific embodiment, the filter tube 2 is a seamless steel tube, and a plurality of holes are evenly distributed on the side wall of the seamless steel tube, and the hole area accounts for 20% to 30% of the surface area of ​​the side wall of the steel tube. According to this arrangement, the inner wall of the filter tube 2 can be connected to the test section.

[0030] In a specific embodiment, the length of the filter tube 2 is greater than or equal to the length of the test section, and the bottom of the filter tube 2 is flush with the bottom of the test section, so as to achieve full coverage of the test section.

[0031] In a specific embodiment, the water stop plug 4 is set at the top plate position of the test section when in use, the test section water inlet hole 421 and the water stop plug pressure hole 41 are set on the upper part of the central rod 42, the two ends of the central rod 42 are respectively set with the water inlet hole 421 and the water outlet 422, the end iron head 43 is divided into an upper iron head and a lower iron head, the two ends of the central rod 42 and the first hollow tube 44 extend out of the upper iron head and the lower iron head respectively and are sealed and connected, and the water stop plug capsule 45 is coaxially sleeved on the outside of the central rod 42. The first hollow tube 44 is inserted in the water stop plug capsule 45. The lower part of the central rod 42 is provided with a lower water outlet 422 connected to the filter flower tube 2.

[0032] Under normal conditions, the outer diameter of the water-stop plug 4 is smaller than the inner diameter of the borehole 1 and can be conveniently lowered into the borehole 1. One end of the first hollow tube 44 is connected to the extended end of the high-pressure gas pipe 5. After the high-pressure gas cylinder 6 is turned on and pressurized to the water-stop plug capsule 45 through the high-pressure gas pipe 5, the water-stop plug 4 is tightly attached to the inner wall of the borehole 1.

[0033] In a specific embodiment, the high-pressure air pipe 5 comprises: a rubber inner lining layer 51 resistant to hydraulic fluid, a steel wire reinforcement layer 52 wound in alternating directions, and an oil-resistant and weather-resistant rubber outer coating layer 53; a steel wire reinforcement layer is arranged on the outer wall of the rubber inner lining layer; and a rubber outer coating layer is arranged outside the steel wire reinforcement layer. The rubber inner lining layer has the function of allowing the conveying medium to withstand pressure and protecting the steel wire from erosion, the rubber outer coating layer protects the steel wire from damage, and the steel wire layer is a skeleton material that plays a reinforcing role.

[0034] In a specific embodiment, the pressure resistance of the high-pressure gas pipe 5 is greater than or equal to 16 MPa.

[0035] In a specific embodiment, the water injection pipe 3 is a drill pipe or a hose.

[0036] In a specific embodiment, the tops of the water injection pipe 3 and the pressure measuring pipe 9 are higher than the opening of the borehole 1 .

[0037] Beneficial effects: This device uses a pneumatic water-stop plug to stop water, and there is no need to lower the working casing. At the same time, the filter flower tube set in the test section can prevent the test section from collapsing during water injection. The pressure measuring tube can accurately measure the water level change, thereby improving the test efficiency and accuracy.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for drilling water injection test, characterized in that: include: A filter tube (2), a water stop plug (4), a water injection pipe (3), a water supply device (7), and an air supply device; the filter tube (2) is accommodated in a test section at the bottom of the borehole (1), and is connected to the water supply device (7) through the water injection pipe (3) and the water stop plug (4); the air supply device is connected to the water stop plug (4) through an air path; The water stop plug (4) comprises: a central rod (42), a water stop plug capsule (45), and a first hollow tube (44); the central rod (42) is sealingly inserted into the water stop plug capsule (45) and is coaxially arranged with the water stop plug capsule (45); the first hollow tube (44) is sealingly inserted into one side of the water stop plug capsule (45) and extends into the filter flower tube (2); the water stop plug capsule (45) is connected to the air path of the air supply device; It comprises: an electric flow meter (8); the electric flow meter (8) is arranged on the water injection pipe (3); It comprises: a pressure measuring tube (9); the pressure measuring tube (9) is inserted into the borehole (1) and is connected to the first hollow tube (44).

2. The test device for drilling water injection test according to claim 1, characterized in that: The filtering flower tube (2) comprises: a steel cylinder; and a plurality of through holes arranged on the side wall of the steel cylinder.

3. The testing device for drilling water injection test according to claim 2, characterized in that: The sum of the through hole areas is 20~30% of the surface area of ​​the steel cylinder side wall.

4. The testing device for drilling water injection test according to claim 1, characterized in that: The water-stopping plug (4) comprises: end iron heads (43); the end iron heads (43) are arranged in pairs on the top surface and the bottom surface of the water-stopping plug capsule, respectively.

5. The testing device for drilling water injection test according to claim 1, characterized in that: One end of the central rod (42) is connected to the water injection pipe (3); the other end of the central rod (42) is connected to the filter flower tube (2).

6. The testing device for drilling water injection test according to claim 1, characterized in that: include: The high-pressure air pipe (5) is connected to the water supply device (7) and the center rod (42).

7. The testing device for drilling water injection test according to claim 6, characterized in that: The high-pressure air pipe (5) comprises: a rubber inner lining layer (51), a steel wire reinforcement layer (52), and a rubber outer covering layer (53); the steel wire reinforcement layer (52) is arranged on the outer wall of the rubber inner lining layer (51); and the rubber outer covering layer (53) is arranged on the outer wall of the steel wire reinforcement layer (52).

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