CN106093338A - Down-hole reacting cycle sampling desorption of mash gas process simulation test device and method of testing - Google Patents
Down-hole reacting cycle sampling desorption of mash gas process simulation test device and method of testing Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 66
- 238000003795 desorption Methods 0.000 title claims abstract description 51
- 238000012018 process simulation test Methods 0.000 title claims abstract description 16
- 238000010998 test method Methods 0.000 title claims abstract description 6
- 239000007789 gas Substances 0.000 claims abstract description 114
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000003245 coal Substances 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 28
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 25
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 110
- 229910052757 nitrogen Inorganic materials 0.000 claims description 34
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000007872 degassing Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims 4
- 230000005611 electricity Effects 0.000 claims 3
- 150000001335 aliphatic alkanes Chemical class 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 15
- 238000011049 filling Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000000658 coextraction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
本发明涉及一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。同时提供了一种井下反循环取样瓦斯解吸过程模拟测试装置的测试方法。本发明可调控煤层温度、煤层瓦斯含量、反循环取样钻孔深度、反循环取样压风强度、反循环取样钻孔沿程温度等外界条件，系统的研究反循环取样过程煤屑瓦斯解吸规律及影响因素，构建了反循环取样过程钻孔沿程气压和温度的变化环境，提供了一种反循环取样从孔底至孔口煤屑流动过程中瓦斯解吸规律的测定方法。
The invention relates to an underground reverse circulation sampling gas desorption process simulation test device, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and is characterized in that: after the high-pressure gas injection system pipe is connected to the vacuum degassing system, The tube is connected to the desorption system at super-normal pressure and constant temperature, and then the tube is connected to the high-pressure nitrogen gas charging system. At the same time, it provides a test method of a simulation test device for the reverse circulation sampling gas desorption process in the well. The present invention can regulate external conditions such as coal seam temperature, coal seam gas content, reverse circulation sampling drilling depth, reverse circulation sampling pressure wind strength, reverse circulation sampling drilling temperature along the way, and systematically study the desorption law of coal cuttings gas in the reverse circulation sampling process and Influencing factors, the pressure and temperature change environment along the borehole during the reverse circulation sampling process was constructed, and a method for measuring the gas desorption law during the process of reverse circulation sampling from the bottom of the hole to the coal cuttings flow at the hole was provided.
Description
技术领域technical field
本发明涉及井下反循环取样瓦斯解吸过程模拟装置及方法，特别涉及井下反循环取样瓦斯解吸过程模拟测试装置及测试方法。The invention relates to an underground reverse circulation sampling gas desorption process simulation device and method, in particular to an underground reverse circulation sampling gas desorption process simulation testing device and a testing method.
背景技术Background technique
煤层瓦斯含量不仅是评价煤层突出危险性强弱的重要指标，也是评估煤层气资源储藏分布规律的重要参数，准确测定煤层瓦斯含量一直是煤气共采领域的重要基础研究。经过几十年的发展，煤层瓦斯含量测定技术取得了突破性成果，其中，井下直接测定煤层瓦斯含量方法应用最为广泛，测值准确率高。井下直接测定煤层瓦斯含量工艺主要包括取样过程损失量、井下解吸量和实验室测定残存量三大部分。井下解吸量和实验室测定残存量均为客观实测值，而损失量是指脱落后的煤屑沿孔底至孔口过程中所解吸逸散的瓦斯量。由于技术所限，取样过程的损失量无法实测，只能通过煤屑初期瓦斯解吸规律反推。Coal seam gas content is not only an important index for evaluating the strength of coal seam outburst risk, but also an important parameter for evaluating the distribution of coal bed methane resources. Accurate determination of coal seam gas content has always been an important basic research in the field of coal gas co-extraction. After decades of development, the measurement technology of coal seam gas content has made a breakthrough. Among them, the method of directly measuring coal seam gas content in the underground is the most widely used method, and the accuracy of the measured value is high. The downhole direct measurement of coal seam gas content mainly includes three parts: loss during sampling process, downhole desorption amount and laboratory determination of residual amount. The downhole desorption amount and the residual amount measured in the laboratory are both objectively measured values, while the loss amount refers to the amount of gas desorbed and dissipated during the process of falling off coal cuttings along the bottom of the hole to the hole opening. Due to technical limitations, the loss in the sampling process cannot be measured, and can only be deduced from the law of gas desorption at the initial stage of coal dust.
目前井下直接测定煤层瓦斯含量常用的取样方法有：麻花钻杆排粉取样、压风取样、反循环钻进取样、取芯管取样。为提高测算结果准确性，国家标准《GB/T 23250-2009》规定取样时间不得超过5min，即快速取样；另外，采集样品必须来源于预定位置，保证定点取样。上述取样方法中，麻花钻杆和压风取样均不能实现定点目的，取芯管虽然能做到定点取样，但取样时间过长、瓦斯损失量大。反循环取样是一种定点快速取样的新方法，非常适用于井下煤层瓦斯含量直接测定以及瓦斯突出预测指标检验等工作。反循环取样钻孔的沿程压力从最初风压最大值逐渐衰减至大气压，表现为变超常压连续衰减状态，此阶段的瓦斯解吸规律异于常压环境下的解吸特征，而标准中规定的损失量推算方法仅适用于常压解吸环境，无法满足反循环超常压取样过程的损失量推算。因此，研究反循环取样过程煤屑瓦斯解吸规律是构建变超常压环境下瓦斯损失量推算模型的基础，也是完善反循环取样测定瓦斯含量和煤层突出危险性指标的根本需求。At present, the commonly used sampling methods for directly measuring the gas content of coal seams in the underground are: twist drill pipe sampling, compressed air sampling, reverse circulation drilling sampling, and core pipe sampling. In order to improve the accuracy of the measurement results, the national standard "GB/T 23250-2009" stipulates that the sampling time should not exceed 5 minutes, that is, rapid sampling; in addition, the collected samples must come from a predetermined location to ensure fixed-point sampling. Among the sampling methods mentioned above, neither the twist drill pipe nor the compressed air sampling can achieve fixed-point sampling. Although the core pipe can achieve fixed-point sampling, the sampling time is too long and the gas loss is large. Reverse circulation sampling is a new fixed-point rapid sampling method, which is very suitable for direct measurement of gas content in underground coal seams and inspection of gas outburst prediction indicators. The pressure along the reverse circulation sampling borehole gradually decays from the initial maximum wind pressure to atmospheric pressure, showing a continuous decay state of variable superatmospheric pressure. The loss calculation The method is only applicable to the normal pressure desorption environment, and cannot meet the calculation of the loss in the reverse cycle super normal pressure sampling process. Therefore, studying the law of coal dust gas desorption during the reverse circulation sampling process is the basis for building a gas loss calculation model under variable superatmospheric pressure environments, and it is also the fundamental requirement for improving reverse circulation sampling to measure gas content and coal seam outburst risk indicators.
发明内容Contents of the invention
本发明目的在于克服现有技术缺点，提供一种井下反循环取样瓦斯解吸过程模拟测试装置及测试方法，从而为反循环取样技术准确测定煤层瓦斯含量以及测定煤层突出危险性指标提供关键的技术手段。The purpose of the present invention is to overcome the disadvantages of the prior art, and provide an underground reverse circulation sampling gas desorption process simulation test device and testing method, so as to provide key technical means for the reverse circulation sampling technology to accurately measure the gas content of the coal seam and measure the risk index of coal seam outburst .
本发明采用的技术方案是：一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，高压瓦斯注气系统包括带有甲烷气瓶开关的高压甲烷气瓶顺序管连接电磁阀a、高压参考罐、压力传感器Ⅰ、电磁阀b、电磁阀c、放空端，真空脱气系统包括真空抽气泵分别管连接电磁阀f及放空端、真空规管及复合真空计后，再管连接电磁阀d，高压氮气充气系统包括带有氮气瓶开关的高压氮气瓶管连接电 磁阀g，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。The technical solution adopted by the present invention is: a simulation test device for underground reverse circulation sampling gas desorption process, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and a high-pressure gas injection system including a methane gas cylinder The high-pressure methane cylinder of the switch is connected to the solenoid valve a, the high-pressure reference tank, the pressure sensor I, the solenoid valve b, the solenoid valve c, and the vent end. The vacuum degassing system includes a vacuum pump that is respectively connected to the solenoid valve f and the vent end, After the vacuum gauge and composite vacuum gauge, the tube is connected to the solenoid valve d. The high-pressure nitrogen gas charging system includes a high-pressure nitrogen gas bottle tube with a nitrogen bottle switch connected to the solenoid valve g. The characteristics are: the high-pressure gas injection system tube is connected to the vacuum degassing system Finally, the tube is connected to the desorption system at a constant temperature at super-normal pressure, and then the tube is connected to the high-pressure nitrogen gas charging system.
其中：超常压恒温解吸系统包括分别管连接压力传感器Ⅲ、电动小流量调节阀、电动三通阀、变压罐，电动小流量调节阀顺序管连接流量传感器、甲烷传感器、放空端，电动三通阀管连接设于恒/变温箱中插有温度传感器的煤样罐后管连接压力传感器Ⅱ，再管连接电磁阀e。Among them: supernormal pressure constant temperature desorption system includes separate pipes connected to pressure sensor Ⅲ, electric small flow regulating valve, electric three-way valve, pressure tank, electric small flow regulating valve sequence pipe connected to flow sensor, methane sensor, vent end, electric three-way The through valve pipe is connected to the coal sample tank with a temperature sensor inserted in the constant/variable temperature box, and the rear pipe is connected to the pressure sensor II, and then the pipe is connected to the solenoid valve e.
其中：PLC分别电连接压力传感器Ⅰ、压力传感器Ⅱ、压力传感器Ⅲ、温度传感器、电动三通阀、流量传感器、甲烷浓度传感器、电动小流量调节阀、电磁阀a、电磁阀b、电磁阀c、电磁阀d、电磁阀e、电磁阀f、电磁阀g、计算机。Among them: PLC is respectively electrically connected to pressure sensor Ⅰ, pressure sensor Ⅱ, pressure sensor Ⅲ, temperature sensor, electric three-way valve, flow sensor, methane concentration sensor, electric small flow regulating valve, solenoid valve a, solenoid valve b, solenoid valve c , Solenoid valve d, solenoid valve e, solenoid valve f, solenoid valve g, computer.
一种井下反循环取样瓦斯解吸过程模拟测试装置的测试方法，包括将筛好的煤样置于干燥箱干燥后，称重装满煤样罐，将煤样罐放入恒/变温箱，并设置开采煤层温度，关闭甲烷气瓶开关后，通过PLC打开电磁阀a、电磁阀b、电磁阀d、电磁阀e，关闭电磁阀c、电磁阀f、电动三通阀，启动真空抽气泵，对煤样罐、高压参考罐以及连接管线脱气，当复合真空计显示设定真空度时，关闭电磁阀a、电磁阀b、电磁阀d、电磁阀e和真空抽气泵，随后立即打开电磁阀f，脱气结束，打开甲烷气瓶开关后，打开电磁阀a、电磁阀b，向高压参考罐充入高浓度甲烷，当压力传感器Ⅰ压力值为设定值，关闭电磁阀a、甲烷气瓶开关，打开电磁阀e，高压参考罐向煤样罐煤样充入甲烷，压力传感器Ⅱ压力值为设定值，关闭电磁阀e，注气结束，电动三通阀、电动小流量调节阀处关闭状态，顺序打开氮气瓶开关、电磁阀g向变压罐充入氮气，压力传感器Ⅲ压力值为矿井下压风系统气压值，关闭电磁阀g、氮气瓶开关，氮气充气完成，特点在于：调节电动三通阀使煤样罐与大气连通，释放煤样罐内游离瓦斯，待压力传感器Ⅱ压力值降至零时，再次调节电动三通阀使煤样罐与变压罐连通，打开电动小流量调节阀，并调节阀门开度，用井下反循环取样深度所耗时间释放变压罐内氮气同时，使井下反循环取样深度所耗时间内初始煤屑温度降至结束煤屑温度变化一致，按时间节点t由流量传感器、甲烷浓度传感器记录混合气体流量Qt和甲烷浓度C％。A test method for an underground reverse circulation sampling gas desorption process simulation test device, including putting the sieved coal sample in a drying oven for drying, weighing and filling the coal sample tank, putting the coal sample tank into a constant/variable temperature box, and Set the mining coal seam temperature, turn off the methane cylinder switch, open solenoid valve a, solenoid valve b, solenoid valve d, solenoid valve e through PLC, close solenoid valve c, solenoid valve f, electric three-way valve, start the vacuum pump, Degas the coal sample tank, high-pressure reference tank and connecting pipelines. When the composite vacuum gauge shows the set vacuum degree, close the solenoid valve a, solenoid valve b, solenoid valve d, solenoid valve e and vacuum pump, and then immediately open the solenoid valve. Valve f, after the degassing is completed, open the switch of the methane gas cylinder, open the solenoid valve a, solenoid valve b, fill the high-concentration methane into the high-pressure reference tank, when the pressure of the pressure sensor I is the set value, close the solenoid valve a, methane Switch on the gas cylinder, open the solenoid valve e, fill the coal sample tank with methane from the high-pressure reference tank, the pressure value of the pressure sensor II is the set value, close the solenoid valve e, the gas injection is completed, the electric three-way valve, electric small flow adjustment The valve is in the closed state, turn on the switch of the nitrogen bottle and the solenoid valve g to fill nitrogen into the pressure transformer tank, the pressure value of the pressure sensor III is the pressure value of the compressed air system in the mine, close the solenoid valve g and the switch of the nitrogen bottle, and the nitrogen gas filling is completed. Features It is: adjust the electric three-way valve to connect the coal sample tank with the atmosphere, release the free gas in the coal sample tank, and when the pressure value of the pressure sensor II drops to zero, adjust the electric three-way valve again to connect the coal sample tank with the pressure change tank. Open the electric small flow regulating valve, and adjust the opening of the valve, and release the nitrogen in the pressure tank at the same time as the time spent in the depth of downhole reverse circulation sampling, so that the initial coal chip temperature drops to the end coal chip temperature in the time spent in the downhole reverse cycle sampling depth The changes are consistent, and the mixed gas flow rate Q t and methane concentration C% are recorded by the flow sensor and the methane concentration sensor according to the time node t.
其中：St＝Qt×C％，St为时间节点t时刻瓦斯解吸量，ml/min；Qt为时间节点t时刻混合气体流量，ml/min；C％为时间节点t时刻甲烷浓度，％，获得瓦斯解吸速度，然后利用微积分计算不同节点的累计瓦斯解吸量。Where: S t = Q t × C%, S t is the gas desorption amount at the time node t, ml/min; Q t is the mixed gas flow rate at the time node t, ml/min; C% is the methane concentration at the time node t , %, to obtain the gas desorption speed, and then use calculus to calculate the cumulative gas desorption volume of different nodes.
改变煤样粒径及初设温度、煤样的吸附平衡压力、氮气初始压力、氮气释放时间和温度监控系统的温变梯度，研究不同煤层瓦斯含量、煤层温度、取样深度、取样风压条件下的反循环取样过程中瓦斯解吸规律。Change the particle size of the coal sample and the initial temperature, the adsorption equilibrium pressure of the coal sample, the initial pressure of nitrogen, the release time of nitrogen and the temperature gradient of the temperature monitoring system, and study the gas content of the coal seam, the temperature of the coal seam, the sampling depth, and the sampling wind pressure. Gas desorption law in the reverse circulation sampling process.
本发明的有益效果在于：本发明测试装置可调控煤层温度、煤层瓦斯含量、反循环取样钻孔深度、反循环取样压风强度、反循环取样钻孔沿程温度等外界条件，系统的研究反循环取样过程煤屑瓦斯解吸规律及影响因素，构建了反循环取样过程钻孔沿程气压和温度的变化环境，提供了一种反循环取样从孔底至孔口煤屑流动过程中瓦斯解吸规律的测定方法。The beneficial effect of the present invention is that: the test device of the present invention can regulate external conditions such as coal seam temperature, coal seam gas content, reverse circulation sampling borehole depth, reverse circulation sampling pressure wind intensity, reverse circulation sampling borehole temperature along the way, systematic research and feedback Coal cuttings gas desorption law and influencing factors in the process of circulating sampling, constructing the change environment of air pressure and temperature along the borehole in the process of reverse circulation sampling, providing a law of gas desorption in the process of reverse circulation sampling from the bottom of the hole to the flow of coal cuttings at the orifice method of measurement.
附图说明Description of drawings
图1是本发明实施例的结构原理示意图；Fig. 1 is the structural schematic diagram of the embodiment of the present invention;
图2是本发明实施例控制原理示意图。Fig. 2 is a schematic diagram of the control principle of the embodiment of the present invention.
图中：1.高压甲烷气瓶，2.高压参考罐，3.复合真空计，4.真空规管，5.真空抽气泵，6.煤样罐，7.温度传感器，8.恒/变温箱，9.电动三通阀，10.高压氮气瓶，11.变压罐，12.流量传感器，13.甲烷浓度传感器，14.电动小流量调节阀，15.压力传感器Ⅰ，16.压力传感器Ⅱ，17.压力传感器Ⅲ，18.电磁阀a，19.电磁阀b，20.电磁阀c，21.电磁阀d，22.电磁阀e，23.电磁阀f，24.电磁阀g，30.氮气瓶开关，40.甲烷气瓶开关，50.计算机，60.PLC。In the figure: 1. High-pressure methane cylinder, 2. High-pressure reference tank, 3. Compound vacuum gauge, 4. Vacuum gauge, 5. Vacuum pump, 6. Coal sample tank, 7. Temperature sensor, 8. Constant/variable temperature Box, 9. Electric three-way valve, 10. High pressure nitrogen cylinder, 11. Transformer tank, 12. Flow sensor, 13. Methane concentration sensor, 14. Electric small flow regulating valve, 15. Pressure sensor Ⅰ, 16. Pressure sensor Ⅱ, 17. Pressure sensor Ⅲ, 18. Solenoid valve a, 19. Solenoid valve b, 20. Solenoid valve c, 21. Solenoid valve d, 22. Solenoid valve e, 23. Solenoid valve f, 24. Solenoid valve g, 30. Nitrogen cylinder switch, 40. Methane cylinder switch, 50. Computer, 60. PLC.
具体实施方式detailed description
第一实施例first embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，高压瓦斯注气系统包括带有甲烷气瓶开关40的高压甲烷气瓶1顺序管连接电磁阀a18、高压参考罐2、压力传感器Ⅰ15、电磁阀b19、电磁阀c20、放空端，真空脱气系统包括真空抽气泵5分别管连接电磁阀f23及放空端、真空规管4及复合真空计3后，再管连接电磁阀d21，高压氮气充气系统包括带有氮气瓶开关30的高压氮气瓶10管连接电磁阀g24，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。See Fig. 1 and Fig. 2, an underground reverse circulation sampling gas desorption process simulation test device, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and a high-pressure gas injection system including a methane gas cylinder switch 40 high-pressure methane gas cylinder 1 sequence pipe is connected to solenoid valve a18, high-pressure reference tank 2, pressure sensor I15, solenoid valve b19, solenoid valve c20, and vent end, and the vacuum degassing system includes vacuum pump 5, respectively pipes are connected to solenoid valve f23 and After the vent end, the vacuum gauge 4 and the compound vacuum gauge 3, the pipe is connected to the solenoid valve d21. The high-pressure nitrogen gas charging system includes a high-pressure nitrogen gas bottle with a nitrogen bottle switch 30. The pipe is connected to the solenoid valve g24. The characteristics are: high-pressure gas injection After the system tube is connected to the vacuum degassing system, the tube is connected to the supernormal pressure constant temperature desorption system, and then the tube is connected to the high-pressure nitrogen gas charging system.
第二实施例second embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，高压瓦斯注气系统包括带有甲烷气瓶开关40的高压甲烷气瓶1顺序管连接电磁阀a18、高压参考罐2、压力传感器Ⅰ15、电磁阀b19、电磁阀c20、放空端，真空脱气系统包括真空抽气泵5分别管连接电磁阀f23及放空端、真空规管4及复合真空计3后，再管连接电磁阀d21，高压氮气充气系统包括带有氮气瓶开关30的高压氮气瓶10管连接电磁阀g24，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。See Fig. 1 and Fig. 2, an underground reverse circulation sampling gas desorption process simulation test device, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and a high-pressure gas injection system including a methane gas cylinder switch 40 high-pressure methane gas cylinder 1 sequence pipe is connected to solenoid valve a18, high-pressure reference tank 2, pressure sensor I15, solenoid valve b19, solenoid valve c20, and vent end, and the vacuum degassing system includes vacuum pump 5, respectively pipes are connected to solenoid valve f23 and After the vent end, the vacuum gauge 4 and the compound vacuum gauge 3, the pipe is connected to the solenoid valve d21. The high-pressure nitrogen gas charging system includes a high-pressure nitrogen gas bottle with a nitrogen bottle switch 30. The pipe is connected to the solenoid valve g24. The characteristics are: high-pressure gas injection After the system pipe is connected to the vacuum degassing system, the pipe is connected to the supernormal pressure constant temperature desorption system, and then the pipe is connected to the high-pressure nitrogen gas charging system.
其中：超常压恒温解吸系统包括分别管连接压力传感器Ⅲ17、电动小流量调节阀14、电动三通阀9、变压罐11，电动小流量调节阀14顺序管连接流量传感器12、甲烷传感器13、放空端，电动三通阀9管连接设于恒/变温箱8中插有温度传感器7的煤样罐6后管连接压力传感器Ⅱ16，再管连接电磁阀e22。Among them: supernormal pressure constant temperature desorption system includes pipe connection pressure sensor Ⅲ17, electric small flow regulating valve 14, electric three-way valve 9, pressure transformer 11, electric small flow regulating valve 14 sequential pipe connection flow sensor 12, methane sensor 13 , vent end, the electric three-way valve 9 tubes are connected to the coal sample tank 6 with the temperature sensor 7 inserted in the constant/variable temperature box 8, and the rear tube is connected to the pressure sensor II16, and then the tube is connected to the solenoid valve e22.
第三实施例third embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，高压瓦斯注气系统包括带有甲烷气瓶开关40的高压甲烷气瓶1顺序管连接电磁阀a18、高压参考罐2、压力传感器Ⅰ15、电磁阀b19、电磁阀c20、放空端，真空脱气系统包括真空抽气泵5分别管连接电磁阀f23及放空端、真空规管4及复合真空计3后，再管连接电磁阀d21，高压氮气充气系统包括带有氮气瓶开关30的高压氮气瓶10管连接电磁阀g24，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。See Fig. 1 and Fig. 2, an underground reverse circulation sampling gas desorption process simulation test device, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and a high-pressure gas injection system including a methane gas cylinder switch 40 high-pressure methane gas cylinder 1 sequence pipe is connected to solenoid valve a18, high-pressure reference tank 2, pressure sensor I15, solenoid valve b19, solenoid valve c20, and vent end, and the vacuum degassing system includes vacuum pump 5, respectively pipes are connected to solenoid valve f23 and After the vent end, the vacuum gauge 4 and the compound vacuum gauge 3, the pipe is connected to the solenoid valve d21. The high-pressure nitrogen gas charging system includes a high-pressure nitrogen gas bottle with a nitrogen bottle switch 30. The pipe is connected to the solenoid valve g24. The characteristics are: high-pressure gas injection After the system pipe is connected to the vacuum degassing system, the pipe is connected to the supernormal pressure constant temperature desorption system, and then the pipe is connected to the high-pressure nitrogen gas charging system.
其中：PLC60分别电连接压力传感器Ⅰ15、压力传感器Ⅱ16、压力传感器Ⅲ17、温度传感器7、电动三通阀9、流量传感器12、甲烷浓度传感器13、电动小流量调节阀14、电磁阀a18、电磁阀b19、电磁阀c20、电磁阀d21、电磁阀e22、电磁阀f23、电磁阀g24、计算机50。Among them: PLC60 is electrically connected to pressure sensor Ⅰ15, pressure sensor Ⅱ16, pressure sensor Ⅲ17, temperature sensor 7, electric three-way valve 9, flow sensor 12, methane concentration sensor 13, electric small flow regulating valve 14, solenoid valve a18, solenoid valve b19, solenoid valve c20, solenoid valve d21, solenoid valve e22, solenoid valve f23, solenoid valve g24, computer 50.
第四实施例Fourth embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置，包括高压瓦斯注气系统管连接真空脱气系统，高压氮气充气系统，高压瓦斯注气系统包括带有甲烷气瓶开关40的高压甲烷气瓶1顺序管连接电磁阀a18、高压参考罐2、压力传感器Ⅰ15、电磁阀b19、电磁阀c20、放空端，真空脱气系统包括真空抽气泵5分别管连接电磁阀f23及放空端、真空规管4及复合真空计3后，再管连接电磁阀d21，高压氮气充气系统包括带有氮气瓶开关30的高压氮气瓶10管连接电磁阀g24，特点在于：高压瓦斯注气系统管连接真空脱气系统后，管连接超常压恒温解吸系统，再管连接高压氮气充气系统。See Fig. 1 and Fig. 2, an underground reverse circulation sampling gas desorption process simulation test device, including a high-pressure gas injection system pipe connected to a vacuum degassing system, a high-pressure nitrogen gas charging system, and a high-pressure gas injection system including a methane gas cylinder switch 40 high-pressure methane gas cylinder 1 sequence pipe is connected to solenoid valve a18, high-pressure reference tank 2, pressure sensor I15, solenoid valve b19, solenoid valve c20, and vent end, and the vacuum degassing system includes vacuum pump 5, respectively pipes are connected to solenoid valve f23 and After the vent end, the vacuum gauge 4 and the compound vacuum gauge 3, the pipe is connected to the solenoid valve d21. The high-pressure nitrogen gas charging system includes a high-pressure nitrogen gas bottle with a nitrogen bottle switch 30. The pipe is connected to the solenoid valve g24. The characteristics are: high-pressure gas injection After the system pipe is connected to the vacuum degassing system, the pipe is connected to the supernormal pressure constant temperature desorption system, and then the pipe is connected to the high-pressure nitrogen gas charging system.
其中：超常压恒温解吸系统包括分别管连接压力传感器Ⅲ17、电动小流量调节阀14、电动三通阀9、变压罐11，电动小流量调节阀14顺序管连接流量传感器12、甲烷传感器13、放空端，电动三通阀9管连接设于恒/变温箱8中插有温度传感器7的煤样罐6后管连接压力传感器Ⅱ16，再管连接电磁阀e22。Among them: supernormal pressure constant temperature desorption system includes pipe connection pressure sensor Ⅲ17, electric small flow regulating valve 14, electric three-way valve 9, pressure transformer 11, electric small flow regulating valve 14 sequential pipe connection flow sensor 12, methane sensor 13 , vent end, the electric three-way valve 9 tubes are connected to the coal sample tank 6 with the temperature sensor 7 inserted in the constant/variable temperature box 8, and the rear tube is connected to the pressure sensor II16, and then the tube is connected to the solenoid valve e22.
其中：PLC60分别电连接压力传感器Ⅰ15、压力传感器Ⅱ16、压力传感器Ⅲ17、温度传感器7、电动三通阀9、流量传感器12、甲烷浓度传感器13、电动小流量调节阀14、电磁阀a18、电磁阀b19、电磁阀c20、电磁阀d21、电磁阀e22、电磁阀f23、电磁阀g24、计算机50。Among them: PLC60 is electrically connected to pressure sensor Ⅰ15, pressure sensor Ⅱ16, pressure sensor Ⅲ17, temperature sensor 7, electric three-way valve 9, flow sensor 12, methane concentration sensor 13, electric small flow regulating valve 14, solenoid valve a18, solenoid valve b19, solenoid valve c20, solenoid valve d21, solenoid valve e22, solenoid valve f23, solenoid valve g24, computer 50.
第五实施例fifth embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置的测试方法，包括将筛好1mm～3mm的煤样置于110℃干燥箱干燥后，称重装满煤样罐6，将煤样罐6放入恒/变温箱8，并设置开采煤层温度，恒温28℃，关闭甲烷气瓶开关40后，通过PLC60打开电磁阀a18、电磁阀b19、电磁阀d21、电磁阀e22，关闭电磁阀c20、电磁阀f23、电动三通阀9，启动真空抽气泵5，对煤样罐6、高压参考罐2以及连接管线脱气，当复合真空计3显示设定真空度10Pa时，关闭电磁阀a18、电磁阀b19、电磁阀d21、电磁阀e22和真空抽气泵5，随后立即打开电磁阀f23，脱气结束，打开甲烷气瓶开关40后，打开电磁阀a18、电磁阀b19，向高压参考罐2充入高浓度99.99％甲烷，当压力传感器Ⅰ15压力值为设定值4.5MPa，关闭电磁阀a18、甲烷气瓶开关40，打开电磁阀e22，高压参考罐2向煤样罐6煤样充入甲烷，压力传感器Ⅱ16压力值为设定值1.5MPa，关闭电磁阀e22，注气结束，电动三通阀9、电动小流量调节阀14处关闭状态，顺序打开氮气瓶开关30、电磁阀g24向变压罐11充入氮气，压力传感器Ⅲ17压力值为矿井下压风系统气压值0.6MPa，关闭电磁阀g24、氮气瓶开关30， 氮气充气完成，特点在于：调节电动三通阀9使煤样罐6与大气连通，释放煤样罐内游离瓦斯，待压力传感器Ⅱ16压力值降至零时，再次调节电动三通阀9使煤样罐6与变压罐11连通，打开电动小流量调节阀14，并调节阀门开度，用井下反循环取样深度100m所耗时间90s释放变压罐11内氮气同时，使井下反循环取样深度100m所耗时间90s内初始煤屑温度28℃降至结束煤屑温度25℃变化一致，既设定温度监控系统的温降梯度为0.033℃/s，按时间节点t由流量传感器12、甲烷浓度传感器13记录混合气体流量Qt和甲烷浓度C％。See Fig. 1 and Fig. 2, a test method for an underground reverse circulation sampling gas desorption process simulation test device, which includes placing a sieved coal sample of 1 mm to 3 mm in a drying oven at 110°C for drying, and then weighing and filling the coal sample tank 6 , put the coal sample tank 6 into the constant/variable temperature box 8, and set the mining coal seam temperature at a constant temperature of 28°C. After closing the methane gas cylinder switch 40, open the solenoid valve a18, solenoid valve b19, solenoid valve d21, and solenoid valve e22 through PLC60 , close the solenoid valve c20, solenoid valve f23, electric three-way valve 9, start the vacuum pump 5, degas the coal sample tank 6, the high-pressure reference tank 2 and the connecting pipeline, when the composite vacuum gauge 3 shows that the set vacuum degree is 10Pa , close the solenoid valve a18, solenoid valve b19, solenoid valve d21, solenoid valve e22 and vacuum pump 5, then immediately open the solenoid valve f23, degassing is completed, turn on the methane gas cylinder switch 40, then open the solenoid valve a18, solenoid valve b19 , fill the high-concentration 99.99% methane into the high-pressure reference tank 2, when the pressure value of the pressure sensor I15 is the set value of 4.5MPa, close the solenoid valve a18, the methane gas cylinder switch 40, open the solenoid valve e22, and the high-pressure reference tank 2 is directed to the coal sample Tank 6 coal sample is filled with methane, the pressure value of pressure sensor Ⅱ16 is the set value of 1.5MPa, the solenoid valve e22 is closed, the gas injection is completed, the electric three-way valve 9 and the electric small flow regulating valve 14 are in the closed state, and the nitrogen cylinder switch is turned on sequentially 30. Solenoid valve g24 fills nitrogen into the pressure transformer tank 11, the pressure value of pressure sensor Ⅲ17 is 0.6MPa of the pressure value of the underground pressure air system in the mine, close the solenoid valve g24 and nitrogen bottle switch 30, and the nitrogen filling is completed. The through valve 9 connects the coal sample tank 6 with the atmosphere, releases the free gas in the coal sample tank, and when the pressure value of the pressure sensor II16 drops to zero, adjust the electric three-way valve 9 again so that the coal sample tank 6 communicates with the pressure change tank 11, Open the electric small flow regulating valve 14, and adjust the opening of the valve, release the nitrogen in the transformer tank 11 at the same time with the downhole reverse circulation sampling depth of 100m within 90 seconds, and make the initial coal chip temperature within 90 seconds of the downhole reverse circulation sampling depth of 100m. From 28°C to 25°C, the final temperature of coal chips changes in the same way. That is to say, the temperature drop gradient of the temperature monitoring system is set to 0.033°C/s, and the flow rate Q t and methane flow rate Q t of the mixed gas are recorded by the flow sensor 12 and the methane concentration sensor 13 according to the time node t. Concentration C%.
第六实施例Sixth embodiment
参见图1、图2，一种井下反循环取样瓦斯解吸过程模拟测试装置的测试方法，包括将筛好1mm～3mm的煤样置于110℃干燥箱干燥后，称重装满煤样罐6，将煤样罐6放入恒/变温箱8，并设置开采煤层温度，恒温28℃，关闭甲烷气瓶开关40后，通过PLC60打开电磁阀a18、电磁阀b19、电磁阀d21、电磁阀e22，关闭电磁阀c20、电磁阀f23、电动三通阀9，启动真空抽气泵5，对煤样罐6、高压参考罐2以及连接管线脱气，当复合真空计3显示设定真空度10Pa时，关闭电磁阀a18、电磁阀b19、电磁阀d21、电磁阀e22和真空抽气泵5，随后立即打开电磁阀f23，脱气结束，打开甲烷气瓶开关40后，打开电磁阀a18、电磁阀b19，向高压参考罐2充入高浓度99.99％甲烷，当压力传感器Ⅰ15压力值为设定值4.5MPa，关闭电磁阀a18、甲烷气瓶开关40，打开电磁阀e22，高压参考罐2向煤样罐6煤样充入甲烷，压力传感器Ⅱ16压力值为设定值1.5MPa，关闭电磁阀e22，注气结束，电动三通阀9、电动小流量调节阀14处关闭状态，顺序打开氮气瓶开关30、电磁阀g24向变压罐11充入氮气，压力传感器Ⅲ17压力值为矿井下压风系统气压值0.6MPa，关闭电磁阀g24、氮气瓶开关30，氮气充气完成，特点在于：调节电动三通阀9使煤样罐6与大气连通，释放煤样罐内游离瓦斯，待压力传感器Ⅱ16压力值降至零时，再次调节电动三通阀9使煤样罐6与变压罐11连通，打开电动小流量调节阀14，并调节阀门开度，用井下反循环取样深度100m所耗时间90s释放变压罐11内氮气同时，使井下反循环取样深度100m所耗时间90s内初始煤屑温度28℃降至结束煤屑温度25℃变化一致，既设定温度监控系统的温降梯度为0.033℃/s，按时间节点t由流量传感器12、甲烷浓度传感器13记录混合气体流量Qt和甲烷浓度C％。See Fig. 1 and Fig. 2, a test method for an underground reverse circulation sampling gas desorption process simulation test device, which includes placing a sieved coal sample of 1 mm to 3 mm in a drying oven at 110°C for drying, and then weighing and filling the coal sample tank 6 , put the coal sample tank 6 into the constant/variable temperature box 8, and set the mining coal seam temperature at a constant temperature of 28°C. After closing the methane gas cylinder switch 40, open the solenoid valve a18, solenoid valve b19, solenoid valve d21, and solenoid valve e22 through PLC60 , close the solenoid valve c20, solenoid valve f23, electric three-way valve 9, start the vacuum pump 5, degas the coal sample tank 6, the high-pressure reference tank 2 and the connecting pipeline, when the composite vacuum gauge 3 shows that the set vacuum degree is 10Pa , close the solenoid valve a18, solenoid valve b19, solenoid valve d21, solenoid valve e22 and vacuum pump 5, then immediately open the solenoid valve f23, degassing is completed, turn on the methane gas cylinder switch 40, then open the solenoid valve a18, solenoid valve b19 , fill high-concentration 99.99% methane into the high-pressure reference tank 2, when the pressure value of the pressure sensor I15 is the set value of 4.5MPa, close the solenoid valve a18, the methane gas cylinder switch 40, open the solenoid valve e22, and the high-pressure reference tank 2 will turn to the coal sample Tank 6 coal sample is filled with methane, the pressure value of pressure sensor Ⅱ16 is the set value of 1.5MPa, the solenoid valve e22 is closed, the gas injection is completed, the electric three-way valve 9 and the electric small flow regulating valve 14 are in the closed state, and the nitrogen cylinder switch is turned on sequentially 30. Solenoid valve g24 fills nitrogen into the pressure transformer tank 11, the pressure value of pressure sensor Ⅲ17 is 0.6 MPa of the pressure value of the underground pressure air system in the mine, close the solenoid valve g24, nitrogen bottle switch 30, and the nitrogen filling is completed. The through valve 9 connects the coal sample tank 6 with the atmosphere, releases the free gas in the coal sample tank, and when the pressure value of the pressure sensor II16 drops to zero, adjust the electric three-way valve 9 again so that the coal sample tank 6 communicates with the pressure change tank 11, Open the electric small flow regulating valve 14, and adjust the opening degree of the valve, release the nitrogen in the transformer tank 11 at the same time with the downhole reverse circulation sampling depth of 100m and take 90 seconds to release the nitrogen in the pressure tank 11, and make the downhole reverse circulation sampling depth of 100m take 90 seconds. From 28°C down to 25°C, the temperature of coal chips changes in the same way, that is, the temperature drop gradient of the temperature monitoring system is set to 0.033°C/s, and the flow sensor 12 and the methane concentration sensor 13 record the mixed gas flow rate Q t and methane concentration according to the time node t. Concentration C%.
其中：St＝Qt×C％，St为时间节点t时刻瓦斯解吸量，ml/min；Qt为时间节点t时刻混合气体流量，ml/min；C％为时间节点t时刻甲烷浓度，％，获得瓦斯解吸速度，然后利用微积分计算不同节点的累计瓦斯解吸量。Where: S t = Q t × C%, S t is the gas desorption amount at the time node t, ml/min; Q t is the mixed gas flow rate at the time node t, ml/min; C% is the methane concentration at the time node t , %, to obtain the gas desorption speed, and then use calculus to calculate the cumulative gas desorption volume of different nodes.
改变煤样粒径及初设温度、煤样的吸附平衡压力、氮气初始压力、氮气释放时间和温度监控系统的温变梯度，研究不同煤层瓦斯含量、煤层温度、取样深度、取样风压条件下的反循环取样过程中瓦斯解吸规律。Change the particle size of the coal sample and the initial temperature, the adsorption equilibrium pressure of the coal sample, the initial pressure of nitrogen, the release time of nitrogen and the temperature gradient of the temperature monitoring system, and study the gas content of the coal seam, the temperature of the coal seam, the sampling depth, and the sampling wind pressure. Gas desorption law in the reverse circulation sampling process.
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| CN111982567A (en) * | 2020-08-17 | 2020-11-24 | 中煤科工集团重庆研究院有限公司 | Construction method of gas loss compensation model in deep hole reverse circulation sampling process |
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| CN106593381A (en) * | 2017-01-19 | 2017-04-26 | 安徽理工大学 | Device and method for testing influence of gas injection on desorption and seepage of coal bed methane in coal rock |
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