Small-flow testing device for drilling water pressure test

Abstract

The utility model discloses a small-flow testing device for a drilling water pressure test, which is characterized in that a first water inlet pipe is connected to the bottom of a metering water tank, and a water quantity detection component is connected in the metering water tank; the water conveying pipeline, the first water inlet pipe and the second water inlet pipe are communicated, the first water inlet pipe is connected with a first switching valve, the second water inlet pipe is connected with a second switching valve, and the water conveying pipeline is connected with a water pump and a pressure gauge; the adjusting pipeline, the output pipeline and the water conveying pipeline are communicated, one end of the adjusting pipeline is connected with a pressure adjusting device, a measuring cylinder is placed at the bottom of the pressure adjusting device, and the output pipeline is connected with a flow meter. Compared with the prior art, the device is low in equipment cost and simple in operation step, in the water pressure test process in the rock mass with the weak permeable rate, the water yield in the metering water tank is calculated, the water inflow in the measuring cylinder is subtracted, the calculated result is the water yield of the rock mass passing through the test section in the water pressure test, measurement is accurate, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of borehole water pressure test, in particular to a small flow test device for borehole water pressure test. Background Art

[0002] Conventional water pressure in drilling is an in-situ permeability test that uses a plug to isolate a certain length of the borehole and applies a maximum pressure of no more than 1MPa to the borehole section to determine the permeability of the rock mass based on the relationship between the amount of water pressed in a certain period of time and the amount of pressure applied. 1 , P 2 , P 3 Level 3 pressure and P 1 -P 2 -P 3 -P 2 -P 1 Five stages, P 1 , P 2 , P 3 They are 0.3MPa, 0.6MPa and 1.0MPa respectively. During the water pressure test of the borehole, a flow meter is needed to measure the amount of water passing through the rock mass of the test section of the borehole. The flow meters on the market can meet the requirements of measuring flow during the water pressure test of the borehole in most cases. However, for some rock masses with relatively low permeability, during the water pressure test, at the two pressure levels of 0.3Mpa and 0.6Mpa, the water flow through the rock mass cracks during the test is small, resulting in the flow meter being unable to measure the flow through the rock mass cracks. Utility Model Content

[0003] The utility model aims to provide a small flow test device for a borehole water pressure test, which has low equipment cost and simple operation steps. During the water pressure test in a rock mass with low water permeability, the water output in the metering water tank is calculated, and the water input in the measuring cylinder is subtracted. The calculated result is the amount of water passing through the rock mass of the test section during the water pressure test. The measurement is accurate and the practicability is high, so as to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A small flow test device for a borehole water pressure test comprises a metering water tank, a first water inlet pipe, a second water inlet pipe, a water delivery pipe, an output pipe and a regulating pipe; the first water inlet pipe is connected to the bottom of the metering water tank, and a water volume detection component is connected in the metering water tank; the water delivery pipe, the first water inlet pipe and the second water inlet pipe are connected, the first water inlet pipe is connected to a first switching valve, the second water inlet pipe is connected to a second switching valve, and the water delivery pipe is connected to a water pump and a pressure gauge; the regulating pipe, the output pipe and the water delivery pipe are connected, one end of the regulating pipe is connected to a pressure regulating device, a measuring cylinder is placed at the bottom of the pressure regulating device, and a flow meter / meter is connected to the output pipe.

[0006] A further improvement of the utility model is that the metering water tank is made of transparent glass and has a cubic structure, a water inlet is connected to the top of the metering water tank, and a scale mark is arranged on the box body of the metering water tank.

[0007] A further improvement of the utility model is that a graduated tube is connected to the outside of the metering water tank, the graduated tube is communicated with the metering water tank, and the liquid level in the graduated tube is flush with the liquid level in the metering water tank.

[0008] A further improvement of the utility model is that the water volume detection component adopts an ultrasonic liquid level transmitter, which is composed of a meter head and a probe.

[0009] A further improvement of the utility model is that one end of the first water inlet pipe is connected to one interface of the three-way joint A, and the water delivery pipeline and the second water inlet pipe are connected to the other two interfaces of the three-way joint A.

[0010] A further improvement of the utility model is that one end of the water delivery pipeline is connected to one interface of the three-way joint B, and the regulating pipeline and the output pipeline are connected to two interfaces of the three-way joint B.

[0011] A further improvement of the utility model is that the water pump is a three-cylinder plunger pump.

[0012] A further improvement of the utility model is that the pressure regulating device is a faucet.

[0013] Beneficial effects of the utility model:

[0014] The utility model provides a small flow rate testing device for a borehole water pressure test, which has low equipment cost and simple operation steps. During the water pressure test in a rock mass with low water permeability, the water output in the metering water tank is calculated, and the water input in the measuring cylinder is subtracted. The calculated result is the amount of water passing through the rock mass of the test section during the water pressure test. The device has accurate measurement and high practicality.

[0015] The small flow rate testing device for drilling water pressure test of the utility model can measure the remaining water volume through the scale mark in addition to the water volume detection component.

[0016] The small flow rate testing device for the borehole water pressure test of the utility model can also be measured through a graduated tube, which is more convenient for observation and reading. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] In the figure: 1-metering water tank, 101-water inlet, 102-scale mark, 102-scale tube, 2-first water inlet pipe, 3-second water inlet pipe, 4-water delivery pipeline, 5-output pipeline, 6-regulating pipeline, 7-first switching valve, 8-second switching valve, 9-water pump, 10-pressure gauge, 11-faucet, 12-tee joint A, 13-tee joint B, 14-measuring cylinder. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1: Figure 1 As shown, a small flow test device for a borehole water pressure test comprises a metering water tank 1, a first water inlet pipe 2, a second water inlet pipe 3, a water delivery pipe 4 with a size of DN20, an output pipe 5 and a regulating pipe 6; the first water inlet pipe 2 is connected to the bottom of the metering water tank 1, and a water volume detection component is connected to the metering water tank 1; the water delivery pipe 4, the first water inlet pipe 2 and the second water inlet pipe 3 are connected, the first water inlet pipe 2 is connected to a first switching valve 7, the second water inlet pipe 3 is connected to a second switching valve 8, and the water delivery pipe 4 is connected to a water pump 9 and a pressure gauge 10; the regulating pipe 6, the output pipe 5 and the water delivery pipe 4 are connected, one end of the regulating pipe 6 is connected to a pressure regulating device, a measuring cylinder 14 is placed at the bottom of the pressure regulating device, and a flow meter / meter is connected to the output pipe 5.

[0021] Among them, the metering water tank 1 is made of transparent glass, with a size of 50cm×50cm×80cm. The capacity of the metering water tank 1 is 200L, and the structure is cubic. The top of the metering water tank 1 is connected with a water inlet 101, which can replenish water into the metering water tank 1. When replenishing water during the test, it is necessary to replenish water quantitatively or record the replenishment amount to ensure the accuracy of the test water calculation while meeting the continuity of the test.

[0022] A scale mark 102 is provided on the body of the metering water tank 1 , and in addition to the water volume detection component, the remaining water volume can also be measured through the scale mark 102 .

[0023] Among them, a graduated tube 103 is connected to the outside of the measuring water tank 1, the graduated tube 103 is connected to the measuring water tank 1, the liquid level in the graduated tube 103 is flush with the liquid level in the measuring water tank 1, and the graduated tube 103 is made of glass, which is more convenient for observation and reading.

[0024] Among them, the water volume detection component adopts an ultrasonic liquid level transmitter, which consists of two parts: a meter head (such as an LCD display) and a probe.

[0025] Among them, one end of the first water inlet pipe 2 is connected to one interface of the three-way joint A12, and the water delivery pipeline 4 and the second water inlet pipe 3 are connected to the other two interfaces of the three-way joint A12.

[0026] Among them, one end of the water delivery pipeline 4 is connected to an interface of the three-way joint B13, and the regulating pipeline 6 and the output pipeline 5 are connected to two interfaces of the three-way joint B13.

[0027] The pressure regulating device is a faucet 11 .

[0028] The specific working principle of the utility model is as follows:

[0029] When the water flow rate infiltrating into the rock mass is large, the inlet end of the second water inlet pipe 3 is connected to a water storage bag or a water storage tank, the second switching valve 8 is opened, and the first switching valve 7 is closed to conduct a test, and a flow meter / meter can be used to directly read the readings.

[0030] When the flow rate of water infiltrating into the rock mass is small, the flow meter / meter cannot read the value. At this time, the second switching valve 8 can be closed, and the first switching valve 7 can be opened to conduct the test. The water output in the metering water tank 1 is calculated, and the water input in the measuring cylinder 14 is subtracted. The final result is the amount of water passing through the rock mass of the test section during the water pressure test.

[0031] In addition, P can be achieved by adjusting the flow rate of the faucet 11 1 , P 2 , P 3 Three levels of pressure change.

[0032] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A drilling water pressure test small flow test device, characterized in that: The invention comprises a metering water tank (1), a first water inlet pipe (2), a second water inlet pipe (3), a water delivery pipe (4), an output pipe (5) and a regulating pipe (6); the first water inlet pipe (2) is connected to the bottom of the metering water tank (1), and a water volume detection component is connected to the metering water tank (1); the water delivery pipe (4), the first water inlet pipe (2) and the second water inlet pipe (3) are connected; the first water inlet pipe (2) is connected to a first switching valve (7), the second water inlet pipe (3) is connected to a second switching valve (8), and the water delivery pipe (4) is connected to a water pump (9) and a pressure gauge (10); the regulating pipe (6), the output pipe (5) and the water delivery pipe (4) are connected; one end of the regulating pipe (6) is connected to a pressure regulating device, a measuring cylinder (14) is placed at the bottom of the pressure regulating device, and the output pipe (5) is connected to a flow meter / meter.

2. A drilling water pressure test small flow test device as claimed in claim 1, characterized in that: The metering water tank (1) is made of transparent glass and has a cubic structure. The top of the metering water tank (1) is connected to a water inlet (101), and a scale mark (102) is provided on the body of the metering water tank (1).

3. A drilling water pressure test small flow test device as claimed in claim 2, characterized in that: The outer side of the metering water tank (1) is connected to a graduated tube (103), the graduated tube (103) is in communication with the metering water tank (1), and the liquid level in the graduated tube (103) is flush with the liquid level in the metering water tank (1).

4. A drilling water pressure test small flow test device as claimed in claim 2 or 3, characterized in that: The water volume detection component adopts an ultrasonic liquid level transmitter, which is composed of two parts: a meter head and a probe.

5. A drilling water pressure test small flow test device as claimed in claim 1, characterized in that: One end of the first water inlet pipe (2) is connected to one interface of the three-way joint A (12), and the water delivery pipeline (4) and the second water inlet pipe (3) are connected to the other two interfaces of the three-way joint A (12).

6. A drilling water pressure test small flow test device as claimed in claim 1, characterized in that: One end of the water delivery pipeline (4) is connected to an interface of the three-way joint B (13), and the regulating pipeline (6) and the output pipeline (5) are connected to two interfaces of the three-way joint B (13).

7. A drilling water pressure test small flow test device as claimed in claim 1, characterized in that: The water pump (9) is a triplex plunger pump.

8. A drilling water pressure test small flow test device as claimed in claim 1, characterized in that: The pressure regulating device is a faucet (11).

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