CN101957252A - Experiment device for detecting sealing performance of swelling capsule and sealing liquid - Google Patents

Abstract

The invention relates to an experimental device for testing the sealing performance of an expansion capsule and a sealing liquid, which includes a steel pipe, one end of which is sealed by a sealing plug, and the other end is open, and the sealing plug is connected to a foaming liquid container through a high-pressure delivery pipe , the foaming liquid container is connected to the high-pressure gas source through another high-pressure delivery pipe, and a stop valve is arranged on the two high-pressure delivery pipes; an expansion capsule is built in the open end of the steel pipe, and the expansion capsule is connected to the hydraulic pressure source through a high-pressure delivery pipe. At least one steel wire is sandwiched between the pump, the expansion capsule and the steel pipe; a liquid filling port is opened on the steel pipe between the expansion capsule and the sealing plug, and a liquid filling port sealing cover is provided at the same time. The invention utilizes a section of steel pipe, an expansion capsule, steel wire and sealing liquid to simulate the pressure measurement drilling, and simultaneously detects the sealing properties of the sealing liquid and the expansion capsule through one device, with simple operation and relatively accurate measurement effect.

Description

An experimental device for testing the sealing performance of expansion capsule and sealing liquid

technical field

The invention relates to a sealing detection device, in particular to a sealing test device for coal seam gas pressure measurement.

Background technique

Coal seam gas pressure measurement is a basic work for preventing coal mine gas disasters. The current gas pressure measurement can be divided into two types according to the sealing material, one is solid sealing, and the other is liquid sealing. The materials used for solid hole sealing are clay, cement slurry, polyurethane, high-water materials, etc. Due to the lack of sealing ability of these materials for micro-cracks around the pressure measurement drilling, the hole sealing is not strict, and the pressure measurement time is long. The result has a large error. Liquid sealing adopts two sections of solid expansion capsules to seal a section of pressure liquid in the middle, relying on this section of pressure liquid to seal the gas gas in the pressure measurement chamber of the drilling gas. Because the liquid has the characteristics of seamlessness and non-drilling under the action of pressure, it has a strong sealing ability for the micro-cracks around the pressure measurement drilling, the sealing effect is good, and the accuracy of the measurement results is high.

Therefore, in order to enable the liquid sealing device to accurately measure the coal seam gas pressure, it is necessary to continuously check the sealing effect of the expansion capsule and the sealing liquid of the liquid sealing device.

Contents of the invention

In view of the above problems, the object of the present invention is to provide an experimental device for testing the sealing performance of an inflatable capsule and a sealing liquid.

In order to achieve the above object, the present invention adopts the following technical solutions: an experimental device for detecting the sealing performance of the expansion capsule and the sealing liquid, which is characterized in that it includes a steel pipe, one end of the steel pipe is blocked by a sealing plug, and the other end is open , a high-pressure delivery pipe is pierced on the sealing plug, and the high-pressure delivery pipe is connected to a foaming liquid container, and the foaming liquid container is connected to a high-pressure gas source through another high-pressure delivery pipe, and the two high-pressure delivery pipes are Both are provided with shut-off valves; an expansion capsule is built in the open end of the steel pipe, and the expansion capsule is connected to the hydraulic pump through a high-pressure delivery pipe, and at least one steel wire is sandwiched between the expansion capsule and the steel pipe for Simulating the drilling gap; on a section of the steel pipe between the expansion capsule and the sealing plug, a liquid filling port is opened, and a liquid filling port sealing cover is also provided at the same time.

The steel pipe is used for simulating the shape of the pressure measurement borehole, and if the simulated borehole is long, it is formed by connecting several sections of steel pipes through flanges.

The steel wire simulates a crack, the length of which is less than the length of the expansion capsule, and the steel wire is preferably curved.

A liquid receiving container is placed under the open end of the steel pipe for receiving leaked sealing liquid.

Due to the adoption of the above technical scheme, the present invention has the following advantages: 1. The present invention is used to detect the sealing liquid and the sealing performance of the expansion capsule used in the gas drilling pressure measuring device. It utilizes a section of steel pipe to simulate drilling, and a The expansion capsule seals the nozzle at one end by pressing and expanding in the expansion capsule; it seals the steel pipe through a sealing plug at the other end of the tube, so that there is a sealed space between the expansion capsule and the sealing plug. 2. It introduces solid, liquid and gas three-phase mixed sealing liquid through the liquid filling port and high-pressure delivery pipe in this section of the sealed space. 3. It simulates drilling cracks by interposing steel wires between the expansion capsule and the steel pipe wall, and detects the sealing performance of the expansion capsule and the sealing performance of the sealing fluid through the ability of the high-pressure mixed sealing fluid to flow through the cracks. The invention can simultaneously detect the tightness of two kinds of sealing media through one device, the operation is simple, and the measurement effect is relatively accurate.

Description of drawings

Fig. 1 is a structural representation of the present invention

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the device of the present invention is mainly composed of a steel pipe, a steel pipe filling port, an expansion capsule, a sealing plug, a steel wire, a high-pressure delivery pipe, a hydraulic pump, a foaming liquid container, a stop valve, and a high-pressure gas source.

The steel pipe 1 is used for simulating pressure-measuring drilling, and the different inner diameters represent different diameters of the simulated pressure-measuring drilling; several sections of steel pipes are connected by flanges 2 to simulate pressure-measuring drilling of different lengths. An expansion capsule 3 is built in at one end of the steel pipe 1, and the mouth of the steel pipe at this end does not need to be sealed; On the section of steel pipe 1 between the expansion capsule 3 and the sealing plug 4, a liquid filling port and a corresponding liquid filling port sealing cover 5 are arranged. At least one steel wire 6 is sandwiched between the expansion capsule 3 and the steel pipe 1. The length of the steel wire 6 is slightly shorter than the length of the expansion capsule 3. The different thicknesses and different bending degrees are used to simulate different shapes and sizes around the pressure measuring borehole. cracks.

The expansion capsule 3 is connected with a high-pressure delivery pipe 7 , the high-pressure delivery pipe 7 passes through the steel pipe 1 , and the other exposed end is connected to a hydraulic pump 8 . Place a liquid receiving container 9 below the steel pipe nozzle at the end where the high-pressure delivery pipe 7 is drawn, that is, below the nozzle that does not need to be sealed.

A high-pressure delivery pipe 7 is also communicated with the sealing plug 4, and the other end of the high-pressure delivery pipe 7 is connected to a foaming liquid container 10, and a shut-off valve 11 is arranged on the high-pressure delivery pipe 7 at the same time. The foaming liquid container 10 is connected to a high-pressure gas source 12 through a high-pressure delivery pipe 7 , and a shut-off valve 13 is also arranged on the other high-pressure delivery pipe 7 .

The whole steel pipe 1 is supported by a bracket 14 to facilitate experiments and reduce steel pipe corrosion.

Adopt the device of the present invention to measure the experimental process of expansion capsule and sealing fluid sealing performance as follows:

(1) Determine the length and thickness of the steel pipe 1 according to the shape and size of the pressure measurement borehole to be simulated, then put the corresponding steel wire 6 and expansion capsule 3 into the right end of the steel pipe 1, and pressurize the hydraulic pump 8 to expand The capsule 3 expands, and the expansion capsule 3 expands until it can seal the steel pipe.

(2) Connect the sealing plug 4 at the left end of the steel pipe 1 so that the left end of the steel pipe 1 is closed.

(3) Prepare the mixed sealing liquid containing solid and liquid two-phase body, pour it into the steel pipe 1 through the liquid filling port on the steel pipe 1, and then close the sealing cap 5 of the liquid filling port tightly.

(4) Prepare the foam body part of the sealing liquid and pour it into the foam liquid container 10, open the stop valve 13 of the high-pressure gas source 12, and pressurize to make the gas mix with the foam body to generate a pressure foam solution.

(5) After the pressure foam solution is formed, open the stop valve 11 on the foaming liquid container 10, so that the pressure foam solution enters the closed space of the steel pipe 1 through the high-pressure delivery pipe 7, and is sealed with the solid-liquid two-phase injection in advance The liquid is mixed to produce a three-phase sealing liquid of solid, liquid and gas.

(6) The three-phase sealing liquid enters the fissure simulated by the steel wire 6 around the expansion capsule 3 under pressure, gradually permeates and leaks to the right of the steel pipe, and flows out of the steel pipe to drop into the liquid receiving container 9 . According to the size of the liquid leakage, the sealing performance and effect of the expansion capsule 3 and the sealing liquid can be checked. The ideal sealing effect is that the sealing liquid does not flow out from the steel pipe and drips into the liquid receiving container 9 .

The above-described embodiments are only used to illustrate the present invention, wherein the structure of each component, connection mode, etc. all can be changed, and all equivalent transformations and improvements carried out on the basis of the technical solution of the present invention should not be excluded from the scope of the present invention. outside the scope of protection.

Claims (7)

1. experimental provision that detects expansion capsule and sealing liquid sealing property, it is characterized in that: it comprises a steel pipe, one end of described steel pipe is by the seal plug shutoff, the other end is open, wear a high-pressure delivery pipe on the described seal plug, high-pressure delivery pipe is communicated to an expanding foam solution container, and described expanding foam solution container is communicated to high-pressure air source by another high-pressure delivery pipe, is provided with stop valve on the described two high pressure delivery pipes;

Be built-in with the expansion capsule in the open end of described steel pipe, described expansion capsule is communicated to hydraulic pump by a high-pressure delivery pipe, is folded with at least one steel wire and is used for simulation boring slit between described expansion capsule and steel pipe;

On one section described steel pipe between described expansion capsule and the seal plug, offer filling opening, and be provided with the filling opening gland bonnet simultaneously.

2. a kind of experimental provision that detects expansion capsule and sealing liquid sealing property as claimed in claim 1 is characterized in that: described steel pipe simulation pressure measurement borehole shape, when the described steel pipe of some joints, each described steel pipe is connected by flange.

3. a kind of experimental provision that detects expansion capsule and sealing liquid sealing property as claimed in claim 1, it is characterized in that: the length of described steel wire is less than the length of expansion capsule.

4. a kind of experimental provision that detects expansion capsule and sealing liquid sealing property as claimed in claim 2, it is characterized in that: the length of described steel wire is less than the length of expansion capsule.

5. as claim 1 or 2 or 3 or 4 described a kind of experimental provisions that detect expansion capsule and sealing liquid sealing property, it is characterized in that: described steel wire is a bending.

6. as claim 1 or 2 or 3 or 4 described a kind of experimental provisions that detect expansion capsule and sealing liquid sealing property, it is characterized in that: a liquid receiving vessel is placed in the below of described steel pipe open end.

7. a kind of experimental provision that detects expansion capsule and sealing liquid sealing property as claimed in claim 5, it is characterized in that: a liquid receiving vessel is placed in the below of described steel pipe open end.

Images