CN108457645A - Coal gas layer nitrogen circulation is handled up pressure break feasibility assessment device - Google Patents
Coal gas layer nitrogen circulation is handled up pressure break feasibility assessment device Download PDFInfo
- Publication number
- CN108457645A CN108457645A CN201810191343.9A CN201810191343A CN108457645A CN 108457645 A CN108457645 A CN 108457645A CN 201810191343 A CN201810191343 A CN 201810191343A CN 108457645 A CN108457645 A CN 108457645A
- Authority
- CN
- China
- Prior art keywords
- sealing cover
- lid
- autoclave body
- ventilation sealing
- righting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
It handles up pressure break feasibility assessment device the invention discloses coal gas layer nitrogen circulation, it includes autoclave body (6), and the left end of the autoclave body (6) is provided with ventilation sealing cover (1), and right end is provided with stable righting lid (7)；The ventilation sealing cover (1) uses detachable structure and generally disk lid, and in arachnoid and between the confining pressure chamber (4) of setting inside the autoclave body (6), screw thread is inlayed for described ventilation sealing cover (1) lower part；It overcomes easy tos produce water-sensitive phenomenon using liquid as transmission medium in the prior art, to block the precipitation pipeline of coal bed gas, the shortcomings that influencing the recovery ratio of coal bed gas, with the pressure break that can handle up the cycle of rock progress nitrogen, and the breakage that reduction coal gas-bearing formation is handled up in the cycle of nitrogen under pressure break, by comparing the advantages of pressure is front and back tested to grind new permeability, and the effect for the pressure break that can handle up nitrogen circulation is evaluated.
Description
Technical field
The present invention relates to coal bed gas energy technology fields, are more specifically that coal gas layer nitrogen circulation pressure break of handling up is feasible
Property evaluating apparatus.
Background technology
In recent years, coal bed gas is the energy all to attract attention in entire energy industry, but the exploitation of coal bed gas is one
Global problem.Currently liquid transmission medium is first used often using the method for the hydromining gas that becomes in the recovery process of coal bed gas
It pressurizes to rock, gap is generated by post-fracturing rock, liquid medium enters coal gas layer by these gaps, not using gas-liquid
Dissolubility makes coal bed gas be produced by rock crevice.
Water-sensitive phenomenon is easy tod produce as transmission medium using liquid, to block the precipitation pipeline of coal bed gas, influences coal
The recovery ratio of layer gas.Although the concept that gas carries out pressure break as transmission medium has been suggested, there is presently no a set of
Complete experimental provision can carry out experimental evaluation and feasibility analysis to gas fracturing effect.
Invention content
It is an object of the invention to overcome the shortcoming of above-mentioned background technology, and propose that coal gas layer nitrogen circulation is handled up pressure
Split feasibility assessment device.
The purpose of the present invention is what is implemented by following measure：Coal gas layer nitrogen circulation handle up pressure break feasibility assessment dress
It sets, it includes autoclave body, and the left end of the autoclave body is provided with ventilation sealing cover, and right end is provided with stable righting lid；Described is logical
Air sealing cover using detachable structure and generally disk lid, the ventilation sealing cover lower part be in arachnoid and with it is described
The internal thread of autoclave body upper end is inlayed,
The autoclave body is internally provided with cavity, and is equipped with rock core among the cavity；
It is provided with the through-hole to connect with the autoclave body internal cavities among the ventilation sealing cover, and described
Snorkel is installed, there are cylindrical cavitys between the bottom end and the rock core of the ventilation sealing cover on through-hole；
The ventilation sealing cover left end is equipped with blow-down pipe, and the ventilation sealing cover upper end is equipped with pressure gauge, institute
It is arranged in a mutually vertical manner between the blow-down pipe and the pressure gauge stated；
The rock core both sides are provided with confining pressure chamber, and the confining pressure chamber cavity wall is in contact with the rock core；
The confining pressure chamber is located inside the autoclave body, and the injection of confining pressure medium is both provided on the confining pressure chamber described in both sides
Pipe connects with outside,
The stabilization righting lid is using detachable structure and generally disk lid, the stabilization righting lid lower part are in
Screw thread is inlayed between arachnoid and the confining pressure chamber being arranged the autoclave body inside.
In the above-mentioned technical solutions：The stabilization righting lid is identical as the ventilation sealing cover shape, and described is steady
It is in solid construction to determine righting lid integrally.
In the above-mentioned technical solutions：The stabilization righting lid left end is in contact with the rock core.
In the above-mentioned technical solutions：The autoclave body is cylindrical, and horizontal positioned.The invention has the advantages that：1、
The present invention uses transmission medium of the gas as fracturing process, can effectively avoid by liquid and be generated by gas production precursor reactant
Water-sensitive phenomenon.2, the pressure break of the invention that can handle up the cycle of rock progress nitrogen, and reduction coal gas-bearing formation is gulped down in the cycle of nitrogen
The breakage under pressure break is spat, grinds new permeability by comparing front and back be tested of pressure, can handle up to nitrogen circulation pressure break
Effect is evaluated.
Description of the drawings
Fig. 1 is apparatus of the present invention structure front view.
Fig. 2 is apparatus of the present invention vertical view.
Fig. 3 is apparatus of the present invention left view.
Fig. 4 is apparatus of the present invention right view.
In figure：Ventilation sealing cover 1, snorkel 2, pressure gauge 3, confining pressure chamber 4, confining pressure medium injection pipe 4.1, rock core 5, autoclave body
6, stablize righting lid 7, blow-down pipe 8.
Specific implementation mode
The performance that the invention will now be described in detail with reference to the accompanying drawings, but they do not constitute limitation of the invention, only
It is for example, while by illustrating that advantages of the present invention will become clearer and be readily appreciated that.
Referring to Fig.1 shown in -4：Coal gas layer nitrogen circulation is handled up pressure break feasibility assessment device, it is characterised in that：It includes
The left end of autoclave body 6, the autoclave body 6 is provided with ventilation sealing cover 1, and right end is provided with stable righting lid 7；The ventilation sealing
Lid 1 using detachable structure and generally disk lid, ventilation 1 lower part of sealing cover be in arachnoid and with the autoclave body
The internal thread of 6 upper ends is inlayed,
The autoclave body 6 is internally provided with cavity, and rock core 5 is equipped among the cavity；
It is provided with the through-hole to connect with 6 internal cavities of the autoclave body among the ventilation sealing cover 1, and described
Through-hole on snorkel 2 is installed, there are cylindrical between the bottom end and the rock core 5 of the ventilation sealing cover 1
Cavity；
1 left end of ventilation sealing cover is equipped with blow-down pipe 8, and 1 upper end of ventilation sealing cover is equipped with pressure gauge
3, it is arranged in a mutually vertical manner between the blow-down pipe 8 and the pressure gauge 3；
5 both sides of rock core are provided with confining pressure chamber 4, and 4 cavity wall of confining pressure chamber is in contact with the rock core 5；
The confining pressure chamber 4 is located inside the autoclave body 6, and confining pressure medium is both provided on the confining pressure chamber 4 described in both sides
Injection pipe 4.1 connects with outside,
The stabilization righting lid 7 uses detachable structure and generally disk lid, 7 lower part of stabilization righting lid
In arachnoid and between the confining pressure chamber 4 of the 6 inside setting of autoclave body, screw thread is inlayed.
The stabilization righting lid 7 is identical as 1 shape of ventilation sealing cover, and the stabilization righting lid 7 is whole to be in
Solid construction.
7 left end of stabilization righting lid is in contact with the rock core 5.
The autoclave body 6 is cylindrical, and horizontal positioned.
The invention also includes following specific steps：1., experiment before answer first laboratory instrument and equipment whether intact, then by instrument
It is placed horizontally on operation console.2., righting lid will be stablized mounted in autoclave body right end and tightening fixation.3., will rock core be packed into autoclave body in
Portion makes rock core be in contact with righting lid is stablized.4., will ventilation sealing cover mounted in autoclave body left end and tightening fixation.5., by nitrogen gas
Source and other pressue devices are connected with the snorkel that righting covers is stablized, and check whether and be completely embedded, by interface
Place's spray water droplet examines its sealing performance.Confining pressure medium injection pipe is connected (confining pressure with confining pressures medium injection devices such as water pumps
Medium generally uses water), and check whether and be completely embedded, check its sealing performance by spraying water droplet to interface.6., institute
Have piping connection it is good after, check whole device whether be in sealing state, first confining pressure medium is injected after inspection
Then confining pressure chamber is ventilated to snorkel.7., to snorkel ventilate generate pressure after, observe pressure gauge on pointer situation of change
Wait for that pressure (pressure criteria can be selected between 8-15MPa) up to standard then opens the blow valve on blow-down pipe and starts to be vented release,
Nitrogen in snorkel and cylindrical air chamber is emptied completely.8., be iteratively repeated process 7. after, removal of core surveys its permeability.
Above-mentioned unspecified part is the prior art.
Above-mentioned unspecified part is the prior art.
Claims (4)
- The pressure break feasibility assessment device 1. coal gas layer nitrogen circulation is handled up, it is characterised in that：It includes autoclave body (6), the kettle The left end of body (6) is provided with ventilation sealing cover (1), and right end is provided with stable righting lid (7)；The ventilation sealing cover (1) is adopted With detachable structure and generally disk lid, described ventilation sealing cover (1) lower part in arachnoid and with the autoclave body (6) The internal thread of upper end is inlayed,The autoclave body (6) is internally provided with cavity, and rock core (5) is equipped among the cavity；It is provided with the through-hole to connect with the autoclave body (6) internal cavities among the ventilation sealing cover (1), and described Through-hole on snorkel (2) is installed, there are in circle between the bottom end and the rock core (5) of the ventilation sealing cover (1) Columnar cavity；Described ventilation sealing cover (1) left end is equipped with blow-down pipe (8), and described ventilation sealing cover (1) upper end is equipped with pressure Table (3) is arranged in a mutually vertical manner between the blow-down pipe (8) and the pressure gauge (3)；Described rock core (5) both sides are provided with confining pressure chamber (4), and confining pressure chamber (4) cavity wall connects with the rock core (5) It touches；The confining pressure chamber (4) is located at autoclave body (6) inside, and confining pressure Jie is both provided on the confining pressure chamber (4) described in both sides Matter injection pipe (4.1) connects with outside,The stabilization righting lid (7) uses detachable structure and generally disk lid, described stabilization righting lid (7) lower part In arachnoid and between the confining pressure chamber (4) of setting inside the autoclave body (6), screw thread is inlayed.
- The pressure break feasibility assessment device 2. coal gas layer nitrogen circulation according to claim 1 is handled up, it is characterised in that：It is described Stabilization righting lid (7) it is identical as ventilation sealing cover (1) shape, the stabilization righting lid (7) is in integrally solid knot Structure.
- The pressure break feasibility assessment device 3. coal gas layer nitrogen circulation according to claim 1 or 2 is handled up, it is characterised in that： Stabilization righting lid (7) left end is in contact with the rock core (5).
- The pressure break feasibility assessment device 4. coal gas layer nitrogen circulation according to claim 3 is handled up, it is characterised in that：It is described Autoclave body (6) it is cylindrical and horizontal positioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810191343.9A CN108457645B (en) | 2018-03-08 | 2018-03-08 | Evaluation device for fracture feasibility of nitrogen circulation huff and puff of gas formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810191343.9A CN108457645B (en) | 2018-03-08 | 2018-03-08 | Evaluation device for fracture feasibility of nitrogen circulation huff and puff of gas formation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108457645A true CN108457645A (en) | 2018-08-28 |
| CN108457645B CN108457645B (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810191343.9A Active CN108457645B (en) | 2018-03-08 | 2018-03-08 | Evaluation device for fracture feasibility of nitrogen circulation huff and puff of gas formation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4391327A (en) * | 1981-05-11 | 1983-07-05 | Conoco Inc. | Solvent foam stimulation of coal degasification well |
| CN201724866U (en) * | 2010-08-06 | 2011-01-26 | 东北石油大学 | Device for measuring rock fracture toughness on deep stratum |
| CN103196762A (en) * | 2013-04-25 | 2013-07-10 | 重庆地质矿产研究院 | Experimental device and method for reforming shale gas reservoir through pulse hydraulic fracturing |
| CN103234890A (en) * | 2013-04-22 | 2013-08-07 | 辽宁工程技术大学 | Low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device |
-
2018
- 2018-03-08 CN CN201810191343.9A patent/CN108457645B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4391327A (en) * | 1981-05-11 | 1983-07-05 | Conoco Inc. | Solvent foam stimulation of coal degasification well |
| CN201724866U (en) * | 2010-08-06 | 2011-01-26 | 东北石油大学 | Device for measuring rock fracture toughness on deep stratum |
| CN103234890A (en) * | 2013-04-22 | 2013-08-07 | 辽宁工程技术大学 | Low-permeability coal high-pressure gas cycle pulse fracturing anti-reflection experimental device |
| CN103196762A (en) * | 2013-04-25 | 2013-07-10 | 重庆地质矿产研究院 | Experimental device and method for reforming shale gas reservoir through pulse hydraulic fracturing |
Non-Patent Citations (2)
| Title |
|---|
| PENG HOU, FENG GAO, ET AL.: "Changes in pore structure and permeability of low permeability coal under pulse gas fracturing", 《JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING》 * |
| 侯 鹏，高 峰，高亚楠，杨玉贵，程红梅: "脉冲气压疲劳对原煤力学特性及渗透率的影响", 《中国矿业大学学报》 * |
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| Publication number | Publication date |
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| CN108457645B (en) | 2021-08-13 |
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