CN203050790U - Testing device for predicting coal bed released gas expansion energy - Google Patents

Abstract

The utility model relates to a measurement of gas expansion energy in an actual underground coal seam, in particular to a measuring device for predicting the gas expansion energy released from coal seams. The measuring device includes a plurality of sealed capsules, and a pressure and temperature parameter acquisition system is placed between the capsules. The measurement device realizes the actual measurement of the expansion energy of the gas released from the coal seam by quickly collecting the gas pressure and temperature parameters during the pressure relief process of the pressure measurement drilling, and utilizing the characteristics of the gas flowing through the reducer. When the borehole is suddenly decompressed, the gas in the coal around the hole wall will instantly desorb and rush into the borehole; when the gas is released from the borehole to the downhole atmosphere, the characteristics of the gas flowing through the reducer are used to quickly The pressure and temperature parameters during the gas release process are collected to calculate the expansion energy of the released gas. Then compare the obtained expansion energy with the outburst critical value of the gas expansion energy released from the borehole to determine the degree of coal seam outburst risk.

Description

A Measuring Device for Predicting Expansion Energy of Gas Released from Coal Seams

technical field

The utility model relates to a measurement of gas expansion energy in an actual underground coal seam, in particular to a measuring device for predicting the gas expansion energy released from coal seams, which belongs to the technical field of coal mine safety.

Background technique

Coal and gas outburst is a dynamic phenomenon in which a large amount of coal, rock and gas suddenly rush into the mining space under the joint action of in-situ stress and gas pressure. Since the occurrence of outburst dynamic phenomena involves the comprehensive effects of various factors such as ground stress, gas factors, physical and mechanical properties of coal, and structural characteristics, this problem is far from being completely resolved. The latest research results show that the power and energy of outburst mainly come from the sudden release and expansion of gas in coal to do work within a few seconds, and the amount of energy determines the occurrence and development of outburst.

At present, the relevant research on applying gas expansion energy to the prediction of coal seam outburst risk is mainly to measure the initial release gas expansion energy in the unit mass coal sample in the laboratory. However, due to the large difference between the physical structure characteristics of the coal sample and the actual coal seam during the measurement process, and the influence of factors such as in-situ stress and coal seam permeability on the measurement results cannot be loaded and analyzed, the measurement results of the gas expansion energy released from the laboratory coal sample It cannot truly reflect the gas expansion energy of the actual coal seam.

Contents of the invention

The purpose of this utility model is to provide a measuring device for predicting the expansion energy of gas released from coal seams in order to overcome the shortcomings of the above-mentioned prior art. The device includes a plurality of sealing capsules, and a pressure and temperature parameter acquisition system is installed between the capsules. Select a suitable place in the underground, and construct a drill hole into the coal seam through the rock formation. After the drilling construction and hole cleaning are completed, the Drilling gas release pressure and temperature parameter acquisition system and pressure relief solenoid valve, put the sealing capsule into the drill hole to the predetermined depth; then use the water pump to fill the sealing capsule with high-pressure water through the high-pressure water pipe to expand the sealing capsule , and use the mucus water pump to fill the high-pressure mucus between the two groups of capsules in the gas pressure measurement sealing section through the high-pressure mucus pipe to seal the cracks in the borehole wall; wait for the gas pressure to rise to a stable level, open the pressure relief solenoid valve, the pressure and temperature At the same time, the parameter acquisition system quickly collects pressure and temperature data every 0.02 seconds. After 15 seconds of data collection, the pressure relief solenoid valve is automatically connected, and the measurement work can be completed. Finally, the measurement device was removed from the drill, and the pressure and temperature parameter acquisition system was brought to the ground, and the expansion energy calculation software was used for data processing to obtain the expansion energy and the total expansion energy of the gas released from the borehole at any time.

The present invention is realized by the following technical scheme: a device for measuring expansion energy of gas released from boreholes for predicting coal and gas outburst, characterized in that: the measuring device includes a first sealing capsule, a second sealing capsule, a third Sealing capsules, each of the above-mentioned sealing capsules is respectively equipped with a sealing capsule end; between the first sealing capsule and the second sealing capsule, there is a protective outer cover and a connecting rod for the first and second sealing capsules; A pressure and temperature parameter acquisition system and a shrinkage tube are respectively arranged between the first hole-sealing capsule and the second hole-sealing capsule; one end of the reducer tube passes through the end of the second hole-sealing capsule and enters the second hole-sealing capsule. The inner core pipe of the hole capsule and one end of the reducer have a pressure relief solenoid valve; the high-pressure water pipe, the high-pressure mucus pipe, and the gas pressure measuring pipe respectively run through the first hole-sealing capsule, the second hole-sealing capsule, and the third hole-sealing capsule.

The measuring device enters the coal seam through drilling, uses a water pump to fill the sealing capsule with high-pressure water through a high-pressure water pipe to inflate the sealing capsule, and uses a mucus water pump to measure the gas pressure through the high-pressure mucus pipe. The high-pressure mucus is filled between the capsules to seal the cracks in the borehole wall.

The utility model has the advantages that the measuring device realizes the actual measurement of the expansion energy of the gas released from the coal seam by rapidly collecting the gas pressure and temperature parameters in the pressure relief process of the pressure measuring drilling and utilizing the characteristics of the gas flowing through the reducer. When the borehole is suddenly depressurized, the gas in the coal around the hole wall will instantly desorb and rush into the borehole; when the gas is released from the borehole to the downhole atmosphere, the characteristics of the gas flowing through the reducer are used to quickly The pressure and temperature parameters during the gas release process are collected to calculate the expansion energy of the released gas.

Description of drawings

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

Fig. 1 is a structural schematic diagram of a measuring device for expansion energy of gas released from a coal seam;

Figure 2 is a schematic diagram of the data acquisition and processing flow of gas expansion energy released from coal seams.

In the figure: 1. coal seam, 2. drilling, 3. end of sealing capsule, 4. first sealing capsule, 5. inner core tube of sealing capsule, 6. pressure and temperature parameter acquisition system, 7. pressure sensor , 8, temperature sensor, 9, protective outer cover and the connecting rod of the first and second sealing capsules, 10, reducer, 11, pressure relief solenoid valve, 12, the second sealing capsule, 13, the third sealing capsule, 14. High pressure water pipe, 15. High pressure mucus pipe, 16. Gas pressure measuring pipe.

Detailed ways

As shown in the figure: select a suitable location underground, construct the coal seam gas pressure measurement drilling 2, install the first sealing capsule 4, the pressure and temperature parameter acquisition system 6, the protective outer cover and the connecting rod 9 of the first and second sealing capsules , the second sealing capsule 12 and the third sealing capsule 13 are installed and connected and sent to the predetermined depth of the borehole; the water pump is used to inject water into the high-pressure water pipe 14 to make the three-section sealing capsule expand and seal the borehole; use a viscous pump Inject mucus into the high-pressure mucus pipe 15 to make the mucus further block the hole wall crack between the second and third sealing capsules; connect the gas pressure measuring pipe 16 to the pressure gauge to observe the gas pressure in the coal seam; wait for the pressure gauge reading to stabilize, The pressure relief solenoid valve 11 is automatically opened, and the high-pressure gas in the borehole is discharged into the inner core pipe of the sealing capsule through the reducer to the atmosphere, and the pressure and temperature collection system is started at the same time. The flow of data collection and processing is shown in Figure 2. The pressure sensor 7 and temperature sensor 8 quickly collect data and store it in the pressure and temperature parameter collection system 6; after 15 seconds of data collection, the pressure measuring and sealing capsule in the drilling 2 can be removed and all components; bring the parameter acquisition system 6 to the ground and apply the expansion energy calculation software to calculate the expansion and total expansion energy of the gas released from the coal seam borehole at any time. Comparing the obtained expansion energy with the outburst critical value of the gas expansion energy released from the borehole, the degree of risk of coal seam outburst can be determined.

Claims (2)

1. one kind is used for the determinator that the prediction coal seam discharges the gas expansion energy, it is characterized in that: this determinator includes the first sealing of hole capsule (4), the second sealing of hole capsule (12), the 3rd sealing of hole capsule (13), above-mentioned each sealing of hole capsule is equipped with sealing of hole capsule termination (3) respectively; Containment envelope first and second sealing of hole capsule connecting rod (9) of holding concurrently is arranged between the described first sealing of hole capsule and the second sealing of hole capsule; Also be equipped with pressure and temperature parameter acquisition system (6), reducing pipe (10) between the described first sealing of hole capsule and the second sealing of hole capsule respectively; One end of described reducing pipe passes the inner core tube (5) that the termination of the second sealing of hole capsule (12) enters the second sealing of hole capsule (12), and an end of reducing pipe unloads pressure electromagnetic valve (11); High-pressure water pipe (14), high pressure mucilage tube (15), gas pressure are measured pipe (16) respectively through the first sealing of hole capsule, the second sealing of hole capsule, the 3rd sealing of hole capsule.

2. according to claim 2 for predicting that the coal seam discharges the determinator of gas expansion energy, it is characterized in that: described determinator enters coal seam (1) by boring (2), utilize water pump, charging into water under high pressure through high-pressure water pipe (14) in the sealing of hole capsule expands the sealing of hole capsule, and utilize the mucus water pump, come shutoff drill hole wall crack through high pressure mucilage tube (15) to filling high pressure mucus between two groups of capsules of gas pressure mensuration sealing of hole section.

Images