CN104502546A - Experimental device and method for detecting sealing performance of sealing material of gas drainage drilling hole - Google Patents

Abstract

The invention discloses an experimental device for detecting the sealing performance of gas drainage drilling sealing materials, which includes a material detection tube (1) for containing the sealing material (14); the material detection tube (1) left, The right two ends are respectively sealed by the left flange (2) and the right flange (15); the left end of the material detection pipe (1) is sequentially connected to the pressure gauge (3) and the left valve (4) through the left pipe (5). ) and air compressor (6); the right end of the material detection tube (1) is connected to the right valve (8), flow meter (9) and water tank (11) in turn through the right pipe (10); it also includes the use of this device Experimental method, this experimental device and method detects the shrinkage performance of materials through the permeability of high-pressure gas. Eliminate inferior sealing materials.

Description

Experimental device and method for testing the sealing performance of gas drainage drilling sealing materials

technical field

The invention relates to a gas drainage drilling sealing material, in particular to an experimental device and method for testing the sealing performance of the gas drainage drilling sealing material.

Background technique

The main method of gas extraction in coal mines in my country is borehole drainage; the sealing materials for borehole drainage are mainly polyurethane foam materials, cement, etc., but these materials are generally shrinkable, which determines the current underground gas extraction in my country. The gas leaks in the holes are generally serious, which has a negative impact on gas drainage and mine safety.

There is generally a lack of an effective detection method to verify the shrinkage of these materials in the borehole and the air leakage in the borehole with the rheology of time.

Contents of the invention

In view of the above-mentioned problems in the prior art, the present invention provides an experimental device and method for detecting the sealing performance of gas drainage drilling sealing materials. The shrinkage performance of the material is detected through the permeability of high-pressure gas, and the idea is simple and the effect is intuitive.

In order to achieve the above object, the technical solution adopted in the present invention is: an experimental device for detecting the sealing performance of the gas drainage drilling sealing material,

It includes a material detection tube for holding the sealing material;

The left and right ends of the material detection tube are respectively sealed by the left flange and the right flange;

The left end of the material detection tube is connected to the pressure gauge, the left valve and the air compressor in turn through the left pipeline;

The right end of the material detection pipe is sequentially connected to the right valve, the flow meter and the water tank through the right pipeline.

The left flange is sealed by screws and rubber pads.

The right flange is sealed by screws and rubber pads.

Both ends of the material detection tube are simultaneously blocked with cotton yarn.

The end of described right pipeline stretches below the liquid level of water tank.

The material detection tube of the material detection tube is made of PE material, and the diameter is a straight tube of 80-115mm.

An experimental method for detecting the sealing performance of a gas drainage drilling sealing material, comprising the following steps:

1) Mix a certain quality of sealing material evenly and fill it into the material detection tube;

2) After the sealing material is completely solidified; open the left valve, turn on the air compressor, fill the experimental device with high-pressure air, and adjust the power of the air compressor so that the reading on the pressure gauge is 20kpa-30kpa;

3) Open the right valve and observe whether there are air bubbles in the right pipeline in the water tank. If there are air bubbles, record the reading of the flow meter, record once every minute, record continuously for 10 minutes, and calculate the total gas volume within 10 minutes flow q;

4) If no air bubbles emerge within 10 minutes, it means that the seal is intact and there is no air leakage, and the gas flow q of the right pipeline is recorded as 0;

5) According to the above steps, conduct a test every 5 days within 3 months, and calculate the initial leakage time t of different sealing materials by comparing the records, and draw a two-dimensional image of the relationship between the leakage gas flow q and time t, so as to compare different sealing materials. Sealing properties between materials.

Compared with the existing devices and methods, this experimental device uses material detection tubes to simulate downhole drilling, and detects the shrinkage performance of materials through the permeability of high-pressure gas. The idea is simple, the effect is intuitive, and it has better detection results. ; Through the device and method, higher quality sealing materials can be selected, and inferior sealing materials can be eliminated.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

In the figure: 1. Material detection tube, 2. Left flange, 3. Pressure gauge, 4. Left valve, 5. Left pipeline, 6. Air compressor, 7. Screw, 8. Right valve, 9. Right Barometer, 10, right pipeline, 11, water tank, 12, rubber pad, 13, cotton yarn, 14, sealing material.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, an experimental device for testing the sealing performance of gas drainage drilling sealing materials,

It includes a material detection tube 1 for containing a sealing material 14, wherein the sealing material 14 is filled with the material detection tube 1;

The left and right ends of the material detection tube 1 are respectively sealed by the left flange 2 and the right flange 15;

The left end of the material detection tube 1 is connected to the pressure gauge 3, the left valve 4 and the air compressor 6 in turn through the left pipeline 5;

The right end of the material detection pipe 1 communicates with the right valve 8 , the flow meter 9 and the water tank 11 through the right pipe 10 in sequence.

Further, the left flange 2 and the right flange 15 are sealed by screws 7 and rubber pads 12, and the sealing effect is simple and effective.

Both ends of the material detection tube 1 are blocked with cotton yarn 13 to further maintain the sealing performance.

The end of the right pipeline 10 can be inserted below the liquid level of the water tank 11, and can also be inserted into the bottom, and the high-pressure air bubbles delivered from the air compressor 6 can show better results.

The material detection pipe 1 is made of PE material, a straight pipe with a diameter of 80-115mm, and is used for simulating downhole drilling. The pipe is easy to manufacture and has good sealing performance.

An experimental method for detecting the sealing performance of a gas drainage drilling sealing material, comprising the following steps:

1) Mix a certain quality of sealing material 14 evenly and fill it into the material detection tube 1;

2) After the sealing material 14 is completely solidified; open the left valve 4, turn on the air compressor 6, and fill the experimental device with high-pressure air. Since the negative pressure of the underground gas drainage is between 10-30Kpa, adjust the air compressor 6 power, so that the reading on the pressure gauge 3 is 20kpa-30kpa, which is used to truly simulate the downhole pressure;

3) Open the right valve 8 and observe whether there are air bubbles in the right pipeline 10 in the water tank 11. If there are air bubbles, record the reading of the flow meter 9 once every minute for 10 minutes, and calculate the flow rate within 10 minutes. The total gas flow rate q;

4) If no air bubbles emerge within 10 minutes, it means that the seal is intact and there is no air leakage, and the gas flow q of the right pipeline 10 is recorded as 0;

5) According to the above steps, conduct a test every 5 days within 3 months, and calculate the initial leakage time t of different sealing materials by comparing the records, and draw a two-dimensional image of the relationship between the leakage gas flow q and time t, so as to compare different sealing materials. Sealing properties between materials.

To sum up, this device detects the shrinkage performance of materials through the permeability of high-pressure gas. Poor quality sealing material.

Claims (7)

1. An experimental device for detecting the sealing performance of gas drainage drilling sealing material, characterized in that, It includes a material detection tube (1) for containing sealing material (14); The left and right ends of the material detection tube (1) are respectively sealed by the left flange (2) and the right flange (15); The left end of the material detection tube (1) is sequentially connected to the pressure gauge (3), the left valve (4) and the air compressor (6) through the left pipe (5); The right end of the material detection pipe (1) is sequentially connected to the right valve (8), flow meter (9) and water tank (11) through the right pipe (10). 2. An experimental device for detecting the sealing performance of gas drainage drilling sealing materials according to claim 1, characterized in that, the left flange (2) is passed through the screw (7) and the rubber pad (12) seal. 3. An experimental device for testing the sealing performance of gas drainage drilling sealing materials according to claim 1 or 2, characterized in that the right flange (15) is connected by screws (7) and rubber pads ( 12) Sealing. 4. An experimental device for detecting the sealing performance of gas drainage drilling sealing materials according to claim 1, characterized in that, both ends of the material detection tube (1) are blocked with cotton yarn (13) at the same time. 5. An experimental device for testing the sealing performance of gas drainage drilling sealing materials according to claim 1, characterized in that the end of the right pipe (10) extends below the liquid level of the water tank (11). 6. An experimental device for detecting the sealing performance of gas drainage drilling sealing materials according to claim 1 or 4, characterized in that, the material detection tube (1) is made of PE material, with a diameter of 80-115mm straight tube. 7. An experimental method for detecting the sealing performance of gas drainage drilling sealing material, is characterized in that, comprises the following steps: 1) Mix a certain quality of sealing material (14) evenly and fill it into the material detection tube (1); 2) After the sealing material (14) is completely solidified; open the left valve (4), turn on the air compressor (6), fill the experimental device with high-pressure air, and adjust the power of the air compressor (6), so that the pressure gauge ( 3) The reading on the screen is 20kpa-30kpa; 3) Open the right valve (8), observe whether there are bubbles coming out of the right pipeline (10) in the water tank (11), if there are bubbles coming out, record the reading of the flow meter (9), record once per minute, and record continuously 10 minutes, and calculate the total gas flow q within 10 minutes; 4) If no air bubbles emerge within 10 minutes, it means that the seal is intact and there is no air leakage, and the gas flow q of the right pipeline (10) is recorded as 0; 5) According to the above steps, conduct a test every 5 days within 3 months, and calculate the initial leakage time t of different sealing materials by comparing the records, and draw a two-dimensional image of the relationship between the leakage gas flow q and time t, so as to compare different sealing materials. Sealing properties between materials.