CN104406895A - Novel coal bed permeability testing device and method - Google Patents
Novel coal bed permeability testing device and method Download PDFInfo
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- CN104406895A CN104406895A CN201410662853.1A CN201410662853A CN104406895A CN 104406895 A CN104406895 A CN 104406895A CN 201410662853 A CN201410662853 A CN 201410662853A CN 104406895 A CN104406895 A CN 104406895A
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Abstract
The invention relates to a novel coal bed permeability testing device and method. The permeability testing device comprises a gas injection system and a sealed recording system, wherein the gas injection system enables gas with certain pressure to enter the sealed recording system after pressurized to certain pressure. According to the permeability testing device and method, through coal bed gas well injection/pressure drop tests, nitrogen is injected into a coal bed for a period with reasonable displacement and pressure, then a pump is stopped for pressure recovery, bottom hole pressure data are recorded during injection and well shutdown, a graph can be drawn automatically on a computer, and the coal bed permeability is calculated accordingly.
Description
Technical field
The present invention relates to a kind of novel coal seam permeability tester for testing and method, belong to technical field of coal exploitation.
Background technology
At present, in China's coal seam permeability research field, the test normally laboratory Seepage Experiment method of test permeability of coal bed gas, but there is certain defect in this method, the extraction of coal sample destroys the objective environment residing for coal body, laboratory Seepage Experiment have ignored the dynamic evolution process in the crack of coal body under mining influence, and laboratory Seepage Experiment can not simulate infiltration row and the gas penetration potential of the fissure system in whole coal seam on a large scale.
In addition, the domestic coal seam permeability Quick Measuring disclosed obtains test unit and method, its device utilizes pressure-generating device, medium in sealing medium accumulator is injected in closed chamber respectively, then by pipeline, gas marker is discharged in air chamber with constant pressure indentation sealing, utilize sealing to draw air chamber in subsequently and collect gas marker, and outwards discharge with fixing pressure, detect concentration and the flow of outer row's gas marker simultaneously, utilize the relation between the concentration of coal seam permeability, gas marker and flow, obtain the permeability in coal seam.
But the coal seam permeability that above-mentioned method obtains has certain deviation; And complex procedures, need appropriate placement closed chamber, and then pour multiple different medium; Great in constructing amount, need the observation boring of arranging a lot of different depth around gas injection boring, take time and effort; Need equipment much to take up room greatly, be not easy at downhole operations.
Coal, as reservoir, has the features such as natural fissure is grown, permeability is lower, high adsorption capacity.In coal seam, the development degree of hugger, the trend of face cleat, the width of hugger are the principal elements controlling coal seam permeability.Although matrix pores also has certain perviousness, because its aperture is less, permeability can be considered zero.Therefore, the permeability in coal seam depends on the permeability of cleat system.
At present, in China's cbm development industry, China is used for assessing the permeability data of coal seam reservoirs performance, and overwhelming majority injection/pressure fall-off test method obtains.Coalbed gas logging test is a kind of transient testing, it follows the ultimate principle of transient testing: when in reservoir, the flowing of fluid is in equilibrium state, if namely the working system changing well changes pressure, then will cause a pressure disturbance in shaft bottom, this disturbance is As time goes on continuous to borehole wall surrounding reservoir radial expansion, finally reaches a new equilibrium state.The erratic process of this pressure disturbance is relevant with the character of stratum, fluid.Therefore, with testing tool by bottomhole wellbore pressure over time rule record, by analyze, can judge and determine the character of reservoir.
Based on coal seam reservoirs low pressure, hypotonic feature, through practice for many years, injection/pressure fall-off test commonly uses well-logging method in coal bed gas well widespread use as one.In injection/pressure fall-off test, reservoir pressure higher than gas desorption pressure, coal seam cleat pore all the time by water saturation, in single-phase flow state.Because coal seam matrix permeability is far smaller than coal seam cleat permeability, fluid only flows in hugger, and testing the permeability reflected is based on the composite permeability of hugger infiltration.
The present invention is by coal-seam gas injection/pressure fall-off test principle, with rational discharge capacity and pressure to coal seam water infusion a period of time, then pressure recover is carried out in termination of pumping, the injection of record and the bottomhole wellbore pressure data of well shut-in period, figure can be drawn out on computers, carry out accordingly calculating coal seam permeability, the determination of permeability is for the important parameter of coal-seam gas business development, and permeability height directly affects coal bed gas well gas production rate.
Summary of the invention
Object of the present invention provides a kind of just to be measured accurately for weak point existing in above-mentioned prior art, operation is simple, save energy consumption, reduces the one novel coal seam permeability tester for testing of construction workload and a kind of assay method.The advantage of this kind of novel coal seam permeability tester for testing and a kind of assay method has: 1), inject and improve reservoir pressure, ensure that in test process as way flow; 2), do not need pumped downhole equipment, simplify operation steps; 3), Well Testing Software analysis can be used, reliable results; 4), speed is fast, and testing radius is large; 5), can be used for antireflective effect analysis after gas phase pressure break.
Object of the present invention can be realized by following measures: it comprises gas injection system and seal record system to the invention provides a kind of novel coal seam permeability tester for testing, it is characterized in that, described gas injection system can make the gas of certain pressure enter seal record system after being pressurized to certain pressure.
Further, described gas injection system comprises air intake opening, high pressure pipe joint, the first valve, the first tensimeter, gas pressurized device, flow take into account exhausr port, described air intake opening is connected with the first described valve, the first described tensimeter respectively by described high pressure pipe joint, the first described tensimeter is connected with described exhausr port by the first valve, the first described tensimeter is connected with described gas pressurized device by described high pressure pipe joint, and then described gas pressurized device is connected with described flowmeter by described high pressure pipe joint, described seal record system comprises the second valve, second tensimeter, preventing spray head, wellhead tee joint, packer, testing string, memory electronic pressure gauge, memory electronic pressure gauge stationary installation, coal seam and closed air chamber, wherein, the second described valve is connected with described second tensimeter by described high pressure pipe joint, second tensimeter is connected with described wellhead tee joint by described high pressure pipe joint, described preventing spray head is arranged on described wellhead tee joint, described wellhead tee joint is arranged on the top of described testing string, described memory electronic pressure gauge stationary installation is fixed on the bottom of described testing string, described memory electronic pressure gauge is fixed in described memory electronic pressure gauge stationary installation, the described testing string be placed in the gas injection boring in described coal seam is carried out seal pack by described packer, make to form described sealed gas chamber in the gas injection in coal seam boring, the flowmeter of described gas injection system is connected with described second valve of described seal record system by described high pressure pipe joint, described second valve is connected through the steady pressure of supercharging and the gas of flow, through described high pressure pipe joint and described second tensimeter, described wellhead tee joint enters described testing string, then entered in described sealed gas chamber by described testing string.
Further, the bottom of described testing string is covered with hole.
In above-mentioned gas injection system and seal record system and device, gas enters high pressure pipe joint by air intake opening, by the first valve regulated admission pressure, first tensimeter reads admission pressure, then admission pressure carries out gas boosting by gas pressurized device, then cmf record enters the gas flow of seal record system, by the second Valve controlling seal record system air inlet, second tensimeter reads the intrasystem pressure of seal record, then gas enters testing string by high pressure pipe joint through wellhead tee joint, then gas enters closed air chamber by the hole bottom testing string, pressure change in memory electronic pressure gauge record sealed gas chamber, gas injection system is connected with seal record system by high pressure pipe joint.
In addition, present invention also offers and a kind ofly utilize novel coal seam permeability tester for testing to test the method for testing of coal seam permeability, it is characterized in that, this method of testing comprises following step:
(1) in underground coal mine workplace air intake or the stable layout test section, region of return airway ocurrence of coal seam, in test section, arrange a coal seam gas injection boring, inside, coal seam is vertically squeezed in gas injection boring in described coal seam;
(2) in described coal seam gas injection boring, form sealed gas chamber, and utilize a kind of novel coal seam permeability tester for testing described in any one of claim 1-3 that gas is injected into described sealed gas chamber with certain pressure and flow;
(3) close the second valve, record the pressure change in described sealed gas chamber, through after a while, take out memory electronic pressure gauge derived record data;
(4) utilize the well test analysis software of standard to carry out analysis interpretation to data thus obtain the permeability in coal seam and the coal seam parameter as initial reservoir pressure, skin factor, mobility-thickness product, in-situ stress gradient, reservoir temperature.
The present invention has Advantageous Effects:
1) the novel coal seam permeability tester for testing of one provided by the invention and method, the construction drill of gas injection system is arranged in coal seam, in the successful boring satisfied condition, utilize the gas pressurized device gas testing body in gas injection system to inject sealed gas chamber with constant high pressure and constant flow, then with the well test analysis software of standard, analysis interpretation is carried out to data.This just can ensure to measure accurately.
2) the novel coal seam permeability tester for testing of one provided by the invention and method, inject gases at high pressure in coal seam, injects and improve reservoir pressure, and ensure that in test process to be way flow, this gives security with regard to giving the accuracy of data
3) the novel coal seam permeability tester for testing of one provided by the invention and method, be use Well Testing Software analysis, reliable results, very clear.
4) the novel coal seam permeability tester for testing of one provided by the invention and method, application be method along with the pressure change in gases at high pressure diffusion memory electronic pressure gauge record sealed air chamber, so the cycle of test is short, speed is fast, and testing radius is large
5) the novel coal seam permeability tester for testing of one provided by the invention and method also may be used for pressure break post analysis
6) simply, do not need pumped downhole equipment, simplify operation steps, this just makes construction volume greatly reduce, and reduces extra spending for the novel coal seam permeability tester for testing of one provided by the invention and method operation,
In a word, the novel coal seam permeability tester for testing of one provided by the present invention and method, compared with traditional method of testing, not only have security performance good, attended operation is convenient, and operation is simple, test period is short, the accurate advantage of result, can also arrive a series of coal seam parameter simultaneously.A kind of novel coal seam permeability tester for testing provided by the present invention and method can be used for the on-site measurement of underground coal mine mining coal permeability, and measurement result reflects the permeability in coal seam on a large scale, initial reservoir pressure, permeability coefficient, skin factor, bottom-hole storage, in-situ stress gradient, the parting pressure in coal seam and clossing pressure etc.Business development for coal-seam gas provides strong technical support.This invention has very high advance compared with the congenerous equipment of other type, process data volume and other integrated performance index there is larger breakthrough, thoroughly solve the deficiency of measuring equipment in cbm development industrial and commercial bank of China industry, once this invention is put on market, traditional method of testing and equipment can be thoroughly replaced in large-scale cbm development project, the blank of integration test coal seam coefficient in China's cbm development industry will be filled up, and similar import equipment can be substituted, for country saves a large amount of foreign exchange fundss.
Accompanying drawing explanation
Fig. 1 is a kind of structural principle schematic diagram of a kind of embodiment of test unit in the present invention;
1-air intake opening, 2-high pressure pipe joint, 3-first valve, 4-first tensimeter, 5-gas pressurized device, 6-flowmeter, 7-second valve, 8-second tensimeter, 9-exhausr port, 10-preventing spray head, 11-wellhead tee joint, 12-packer, 13-testing string, 14-memory electronic pressure gauge, 15-memory electronic pressure gauge stationary installation, 16-coal seam, 17-closed air chamber.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As shown in Figure 1, it comprises gas injection system and seal record system to the invention provides a kind of novel coal seam permeability tester for testing, and gas injection system can make the gas of certain pressure enter seal record system after being pressurized to certain pressure.
Gas injection system comprises air intake opening 1, high pressure pipe joint 2, first valve 3, first tensimeter 4, gas pressurized device 5, flowmeter 6 and exhausr port 9, air intake opening 1 is shown to be connected with the first valve 3, first pressure 4 by high pressure pipe joint 2 respectively, first tensimeter 4 is connected with exhausr port 9 by the first valve 3, first tensimeter 4 is connected with gas pressurized device 5 by high pressure pipe joint 2, and then gas pressurized device 5 is connected with flowmeter 6 by high pressure pipe joint 2, seal record system comprises the second valve 7, second tensimeter 8, preventing spray head 10, wellhead tee joint 11, packer 12, testing string 13, memory electronic pressure gauge 14, memory electronic pressure gauge stationary installation 15, coal seam 16 and closed air chamber 17, wherein, second valve 7 is connected with the second tensimeter 8 by high pressure pipe joint 2, second tensimeter 8 is connected with wellhead tee joint 11 by high pressure pipe joint 2, preventing spray head 10 is arranged on wellhead tee joint 11, wellhead tee joint 11 is arranged on the top of testing string 13, memory electronic pressure gauge stationary installation 15 is fixed on the bottom of testing string 13, memory electronic pressure gauge 14 is fixed in memory electronic pressure gauge stationary installation 15, the testing string 13 be placed in the gas injection boring in coal seam is carried out seal pack by packer 12, make to form sealed gas chamber 17 in the gas injection boring in coal seam, the flowmeter 6 of gas injection system is connected with the second valve 7 of seal record system by high pressure pipe joint 2, second valve 7 is connected through the steady pressure of supercharging and the gas of flow, through high pressure pipe joint 2 and the second tensimeter 8, wellhead tee joint 11 enters testing string 13, then enter in sealed gas chamber 17 by testing string 13, wherein testing string 13 is covered with hole bottom being set to.
In above-mentioned gas injection system and seal record system and device, gas enters high pressure pipe joint 2 by air intake opening 1, admission pressure is regulated by the first valve 3, first tensimeter 4 reads admission pressure, then admission pressure carries out gas boosting by gas pressurized device 5, then flowmeter 6 record enters the gas flow of seal record system, the air inlet of seal record system is controlled by the second valve 7, second tensimeter 8 reads the intrasystem pressure of seal record, then gas enters testing string 13 by high pressure pipe joint 2 through wellhead tee joint 11, then gas enters closed air chamber 17 by the hole bottom testing string 13, memory electronic pressure gauge 14 records the pressure change in sealed gas chamber, gas injection system is connected with seal record system by high pressure pipe joint 2.
In addition, present invention also offers and a kind ofly utilize novel coal seam permeability tester for testing to test the method for testing of coal seam permeability, it is characterized in that, this method of testing comprises following step:
(1) in underground coal mine workplace air intake or the stable layout test section, region of return airway ocurrence of coal seam, in test section, arrange a coal seam gas injection boring, inside, coal seam is vertically squeezed in gas injection boring in described coal seam;
(2) in described coal seam gas injection boring, form sealed gas chamber, and utilize a kind of novel coal seam permeability tester for testing described in any one of claim 1-3 that gas is injected into described sealed gas chamber with certain pressure and flow;
(3) close the second valve, record the pressure change in described sealed gas chamber, through after a while, take out memory electronic pressure gauge derived record data;
(4) utilize the well test analysis software of standard to carry out analysis interpretation to data thus obtain the permeability in coal seam and the coal seam parameter as initial reservoir pressure, skin factor, mobility-thickness product, in-situ stress gradient, reservoir temperature.
Principle of work of the present invention is as follows:
Be described referring to Fig. 1, when equipment works, inject from lower ground face injection pressure, to reduce the impact (because coal seam be stress-sensitive formation) of stress on coal seam permeability, guarantee that injection pressure is lower than coal seam parting pressure in the injection length of design simultaneously.Air intake opening 1 accesses the air-supply pipeline (general pressure is 0.5MP) in tunnel, by the pressure of the adjustable gas entered in gas pressurized device 5 of the first valve 3, first tensimeter 4 is the pressure in order to read the gas entered in gas pressurized device 5, gas enters sealed gas chamber 17 through high pressure pipe joint 2 after supercharging, flowmeter 6 reads and records the gas flow entering sealed gas chamber 17, second tensimeter 8 reads the pressure in sealed air chamber 17, through overregulating injection pressure, in the metastable situation of maintenance discharge capacity, continue injection after 8 hours, close the second valve 7 and test coal seam gas injection boring bottom pressure recovery situation, after test terminates, by scene admission pressure count certificate, when the requirement of analysis can be met, deblocking also takes out testing string 13, derive the data in memory electronic pressure gauge 14, with the well test analysis software of standard, analysis interpretation is carried out to data, coal seam permeability can be obtained, initial reservoir pressure can also be obtained simultaneously, skin factor, mobility-thickness product, in-situ stress gradient, reservoir temperature etc.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (4)
1. a novel coal seam permeability tester for testing, it comprises gas injection system and seal record system, it is characterized in that, described gas injection system comprises air intake opening, high pressure pipe joint, first valve, first tensimeter, gas pressurized device, flow takes into account exhausr port, described air intake opening by described high pressure pipe joint respectively with the first described valve, the first described tensimeter is connected, the first described tensimeter is connected with described exhausr port by the first valve, the first described tensimeter is connected with described gas pressurized device by described high pressure pipe joint, then described gas pressurized device is connected with described flowmeter by described high pressure pipe joint, described seal record system comprises the second valve, second tensimeter, preventing spray head, wellhead tee joint, packer, testing string, memory electronic pressure gauge, memory electronic pressure gauge stationary installation, coal seam and closed air chamber, wherein, the second described valve is connected with described second tensimeter by described high pressure pipe joint, second tensimeter is connected with described wellhead tee joint by described high pressure pipe joint, described preventing spray head is arranged on described wellhead tee joint, described wellhead tee joint is arranged on the top of described testing string, described memory electronic pressure gauge stationary installation is fixed on the bottom of described testing string, described memory electronic pressure gauge is fixed in described memory electronic pressure gauge stationary installation, the described testing string be placed in the gas injection boring in described coal seam is carried out seal pack by described packer, make to form described sealed gas chamber in the gas injection in coal seam boring, the flowmeter of described gas injection system is connected with described second valve of described seal record system by described high pressure pipe joint, described second valve is connected through the steady pressure of supercharging and the gas of flow, through described high pressure pipe joint and described second tensimeter, described wellhead tee joint enters described testing string, then entered in described sealed gas chamber by described testing string.
2. the novel coal seam permeability tester for testing of one according to claim 1, it is characterized in that, the bottom of described testing string is covered with hole.
3. the novel coal seam permeability tester for testing of one according to claim 1, is characterized in that, described gas injection system can make gas after supercharging, enter seal record system.
4. utilize a kind of novel coal seam permeability tester for testing described in any one of claim 1-3 to test the method for testing of coal seam permeability, it is characterized in that, this method of testing comprises following step:
(1) in underground coal mine workplace air intake or the stable layout test section, region of return airway ocurrence of coal seam, in test section, arrange a coal seam gas injection boring, inside, coal seam is vertically squeezed in gas injection boring in described coal seam;
(2) in described coal seam gas injection boring, form sealed gas chamber, and utilize a kind of novel coal seam permeability tester for testing described in any one of claim 1-3 that gas is injected into described sealed gas chamber with certain pressure and flow;
(3) close the second valve, record the pressure change in described sealed gas chamber, through after a while, take out memory electronic pressure gauge derived record data;
(4) utilize the well test analysis software of standard to carry out analysis interpretation to data thus obtain the permeability in coal seam and the coal seam parameter as initial reservoir pressure, skin factor, mobility-thickness product, in-situ stress gradient, reservoir temperature.
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| CN105064971A (en) * | 2015-09-08 | 2015-11-18 | 中国矿业大学 | High-pressure nitrogen blast cracking permeability increase experimental device and method |
| CN105221143A (en) * | 2015-09-07 | 2016-01-06 | 中国石油天然气集团公司 | A kind of coal seam permeability computational methods based on mining data |
| CN105259091A (en) * | 2015-11-10 | 2016-01-20 | 河南理工大学 | Pressure-bearing broken residual coal permeability evolution and spontaneous combustion characteristic testing device |
| CN106644823A (en) * | 2016-12-21 | 2017-05-10 | 山西大学 | Air tightness testing device for coal wall coating and air tightness testing method applied to air tightness testing device |
| CN106932328A (en) * | 2017-05-16 | 2017-07-07 | 四川大学 | The system and method for coal body permeability is tested using search gas |
| CN109269955A (en) * | 2018-09-29 | 2019-01-25 | 中国矿业大学 | A kind of coal rock layer permeability in-situ testing device and method |
| CN109630100A (en) * | 2018-10-31 | 2019-04-16 | 中国矿业大学 | A kind of automation coal seam permeability test device and method |
| CN110243746A (en) * | 2019-07-01 | 2019-09-17 | 重庆大学 | A kind of device and method of layer-through drilling quick in situ test coal seam permeability |
| CN112504936A (en) * | 2020-11-30 | 2021-03-16 | 中国地质大学（北京） | Testing device and testing method for simulating and researching permeability of deep coal bed methane |
| CN116430916A (en) * | 2023-06-08 | 2023-07-14 | 北京科技大学 | Device for accurately controlling small cavity gas pressure based on permeation method and testing method |
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| CN105221143A (en) * | 2015-09-07 | 2016-01-06 | 中国石油天然气集团公司 | A kind of coal seam permeability computational methods based on mining data |
| CN105221143B (en) * | 2015-09-07 | 2018-05-04 | 中国石油天然气集团公司 | A kind of coal seam permeability computational methods based on mining data |
| CN105064971A (en) * | 2015-09-08 | 2015-11-18 | 中国矿业大学 | High-pressure nitrogen blast cracking permeability increase experimental device and method |
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| CN105259091A (en) * | 2015-11-10 | 2016-01-20 | 河南理工大学 | Pressure-bearing broken residual coal permeability evolution and spontaneous combustion characteristic testing device |
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| CN109269955B (en) * | 2018-09-29 | 2023-11-21 | 中国矿业大学 | In-situ testing device and method for permeability of coal stratum |
| CN109630100A (en) * | 2018-10-31 | 2019-04-16 | 中国矿业大学 | A kind of automation coal seam permeability test device and method |
| CN110243746A (en) * | 2019-07-01 | 2019-09-17 | 重庆大学 | A kind of device and method of layer-through drilling quick in situ test coal seam permeability |
| CN112504936A (en) * | 2020-11-30 | 2021-03-16 | 中国地质大学（北京） | Testing device and testing method for simulating and researching permeability of deep coal bed methane |
| CN112504936B (en) * | 2020-11-30 | 2021-12-03 | 中国地质大学（北京） | Testing device and testing method for simulating and researching permeability of deep coal bed methane |
| CN116430916A (en) * | 2023-06-08 | 2023-07-14 | 北京科技大学 | Device for accurately controlling small cavity gas pressure based on permeation method and testing method |
| CN116430916B (en) * | 2023-06-08 | 2023-09-29 | 北京科技大学 | Device for accurately controlling small cavity gas pressure based on permeation method and testing method |
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