CN203847088U - Physical simulation test piece of coal-bed gas well hydrofracture - Google Patents
Physical simulation test piece of coal-bed gas well hydrofracture Download PDFInfo
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- CN203847088U CN203847088U CN201420148275.5U CN201420148275U CN203847088U CN 203847088 U CN203847088 U CN 203847088U CN 201420148275 U CN201420148275 U CN 201420148275U CN 203847088 U CN203847088 U CN 203847088U
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- 238000004088 simulation Methods 0.000 title claims abstract description 63
- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 239000003245 coal Substances 0.000 claims abstract description 95
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000011435 rock Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 6
- 238000005065 mining Methods 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The utility model relates to a physical simulation test piece of coal-bed gas well hydrofracture. A simulation top plate is arranged at the upper layer of the physical simulation test piece of coal-bed gas well hydrofracture, coal rock of a simulated coal-containing interval is arranged under the simulation top plate and surrounded by cement, and a simulation base plate is arranged under the coal rock; a simulation shaft is arranged in the middle part of a test piece model and penetrates through the simulation top plate to the middle part of the coal rock; an open hole section is arranged at the bottom of the simulation shaft and located in the middle part of the coal rock. The physical simulation test piece of coal-bed gas well hydrofracture is used for performing intensive study on the law of fracture extension in the coal-bed gas well hydrofracture process, and takes the influence of the mechanical properties of the coal rock and the rock of the top and base plates thereof on the fracture extension of hydrofracture into account simultaneously; as a result, the influence of the hydro-fracturing operation on the top and base plates of the coal reservoirs can be studied conveniently and the influence of the hydro-fracturing operation on coal mining can be analyzed favorably.
Description
Technical field
the utility model relates to a kind of indoor coal bed gas well hydrofracture simulation specimen carrying out, and especially can simulate a kind of coal bed gas well fracturing physical analogy test specimen under more meeting containing coal seam section geological conditions and rock mechanics condition.
Background technology
at present, China's coal bed gas resource is abundant, and present stage, China's coal gas industry just progressively strides forward to commercialization from theoretical research.But the coal field geology condition that is controlled by China's complexity, coal seam reservoirs permeability is generally lower.Therefore,, when carrying out coal-bed gas exploitation, usually need coal seam reservoirs to increase production transformation.At present, it is effective that hydraulic fracturing technology is applied, but people are also lower to the understanding of fracturing fracture.Laboratory simulation pressure break is the important means of understanding fracturing fracture Extending Law, has also obtained a lot of achievements, yet has wherein yet had some problems.On the one hand, simulation pressure break test specimen is in the past to replace coal petrography with analog material, has ignored the anisotropy of coal petrography, even if add artificial crack can not replace microfissure in original coal petrography and the developmental state at joint completely in analog material; On the other hand, the impact of Seam Roof And Floor on pressure break do not considered in the pressure break experiment of carrying out as pressure break test specimen with coal petrography, in the experiment that has the shoulder effect considered, not considering the mechanical properties of rock of country rock, is simple for wrapping up pressure break test specimen, for loading three-dimensional stress.Therefore, design a kind of novel coal bed gas well fracturing physical analogy pressure break test specimen significant for carrying out fracturing PHYSICAL MODELING OF IN.
existing technical scheme embodies both ways, the one: with block raw coal, in laboratory, carry out fracturing simulated experiment, directly three-dimensional confined pressure is loaded in block coal sample, in experiment material, original coal seam reservoirs feature can be reflected in crack and joint, as the use bulk coal petrographys such as Du Chunzhi (2011) have carried out fracturing experimental study in laboratory, obtained certain achievement.The 2nd: in the use of analog material, lot of domestic and international scholar or R&D institution just start in geomechanical model test, to use analog material from the sixties in 20th century, have obtained large quantities of achievements in research (Zhang Ning, 2009).As left, protect into (2004), Ma Fangping (2004), Lin Haixiao, Du Chunzhi (2011) etc. with analog material develop coal, petrophysical model carries out related experiment.
to sum up, can find out, for coal bed gas well fracturing physical analogy test specimen, making has obtained a lot of achievements at present, but its preparation method also exists a lot of deficiencies, can not accurately reflect original coal-bearing strata condition.Therefore, need a kind of so more rational coal bed gas well fracturing physical analogy test specimen preparation method of design, so that analog result more approaches actual conditions, for more furtheing investigate coal bed gas well fracturing, provide support.
Utility model content
in order to solve the deficiency existing in existing physical analogy test specimen, the utility model provides a kind of coal bed gas well fracturing physical analogy test specimen, the method that this kind of coal bed gas well fracturing physical analogy test specimen adopts analog material to combine with coal petrography, use the principle of similitude, make the pressure break test specimen that more meets coal-bearing strata condition, the rule that is conducive to fracture extension in more deep research coal bed gas well fracturing process, the impact that the mechanical properties of rock of simultaneously having considered coal petrography itself and roof and floor thereof extends hydraulically created fracture; Be conducive to study the impact of fracturing operation on coal seam reservoirs roof and floor; Contribute to analyze the impact of fracturing operation on coal mining.
the utility model solves the technical scheme that its technical problem adopts: this kind of coal bed gas well fracturing physical analogy test specimen comprises: simulation wellbore hole, simulation top board, Open-Hole Section, cement, coal petrography, simulation base plate, upper strata in this kind of coal bed gas well fracturing physical analogy test specimen is provided with simulation top board, simulation top board below is provided with simulation containing the coal petrography in the section of coal seam, coal petrography is provided with cement around, and coal petrography below is provided with simulation base plate; The middle part of test specimen model is provided with simulation wellbore hole, and simulation wellbore hole is through simulating top board to coal petrography middle part; Simulation wellbore hole below is provided with Open-Hole Section, and Open-Hole Section is positioned at the middle part of coal petrography; Principle is mainly to simulate the fracturing process containing coal seam section by making analog material pressure break test specimen, the impact that the mechanical properties of rock of analysis coal petrography itself and roof and floor thereof extends hydraulically created fracture, is conducive to study the impact of fracturing operation on coal seam reservoirs roof and floor; Contribute to analyze the impact of fracturing operation on coal mining; During experiment, the coal petrography of choice experiment desired thickness, punches according to the diameter of simulation wellbore hole at coal petrography center, then fixed-analog pit shaft is installed on coal petrography, simulation wellbore hole bottom should and drilling hole at the bottom of between leave one section of Open-Hole Section; According to laboratory, carry out the pressure break test specimen of size Selection suitable dimension of the laboratory apparatus pressure break test specimen clamper of fracturing and make mould; According to the mix proportion scheme of the base plate of above-mentioned acquisition, coal dust, fine sand, cement, gypsum are added to water and stir, after fully mixing, according to thickness, add in mould, form simulation base plate; The coal petrography that simulation wellbore hole is housed is placed on simulation base plate again, guarantees that simulation wellbore hole position is in the symmetrical centre of test specimen, coal petrography around water mud drum is wrapped up in; Finally according to mix proportion scheme, coal dust, fine sand, cement, gypsum are added to water and stir, after fully mixing, according to thickness, add in mould, form simulation top board, leveling, facilitate clamper can by stress equilibrium be applied to the surface of simulation pressure break test specimen; By the time test specimen completely fixed after, take mould apart and just obtained simulation pressure break test specimen.
the beneficial effects of the utility model, the rule of fracture extension in this kind of coal bed gas well fracturing physical analogy test specimen further investigation coal bed gas well fracturing process, the impact of the mechanical properties of rock of simultaneously having considered coal petrography itself and roof and floor thereof on hydraulically created fracture extension; Be conducive to study the impact of fracturing operation on coal seam reservoirs roof and floor; Contribute to analyze the impact of fracturing operation on coal mining.
Accompanying drawing explanation
below in conjunction with drawings and Examples, the utility model is further illustrated.
fig. 1 is structural representation of the present utility model.
in Fig. 1,1. simulation wellbore hole, 2. simulates top board, 3. Open-Hole Section, 4. cement, 5. coal petrography, 6. simulation base plate.
The specific embodiment
in Fig. 1, this a kind of coal bed gas well fracturing physical analogy test specimen comprises: simulation wellbore hole 1, simulation top board 2, Open-Hole Section 3, cement 4, coal petrography 5, simulation base plate 6, upper strata in this kind of coal bed gas well fracturing physical analogy test specimen is provided with simulation top board 2, simulation top board 2 belows are provided with simulation containing the coal petrography 5 in the section of coal seam, coal petrography 5 is provided with cement 4 around, and coal petrography 5 belows are provided with simulation base plate 6; The middle part of test specimen model is provided with simulation wellbore hole 1, and simulation wellbore hole 1 is through simulating top board 2 to coal petrography 5 middle parts; Simulation wellbore hole 1 below is provided with Open-Hole Section 3, and Open-Hole Section 3 is positioned at the middle part of coal petrography 5; Principle is mainly to simulate the fracturing process containing coal seam section by making analog material pressure break test specimen, analyze the impact that coal petrography 5 mechanical properties of rock and roof and floor own extends hydraulically created fracture, be conducive to study the impact of fracturing operation on coal seam reservoirs roof and floor; Contribute to analyze the impact of fracturing operation on coal mining; During experiment, the coal petrography 5 of choice experiment desired thickness, punches according to the diameter of simulation wellbore hole 1 at coal petrography 5 centers, then on coal petrography 5, fixed-analog pit shaft 1 is installed, simulation wellbore hole 1 bottom should and drilling hole at the bottom of between leave one section of Open-Hole Section 3; According to laboratory, carry out the pressure break test specimen of size Selection suitable dimension of the laboratory apparatus pressure break test specimen clamper of fracturing and make mould; According to mix proportion scheme, coal dust, fine sand, cement, gypsum are added to water and stir, after fully mixing, according to thickness, add in mould, form simulation base plate 6; The coal petrography 5 that simulation wellbore hole 1 is housed is placed on simulation base plate 6 again, guarantees that simulation wellbore hole 1 position is in the symmetrical centre of test specimen, coal petrography 5 is around with cement 4 parcels; Finally according to mix proportion scheme, coal dust, fine sand, cement, gypsum are added to water and stir, after fully mixing, according to thickness, add in mould, form simulation top board 2, leveling, facilitate clamper can by stress equilibrium be applied to the surface of simulation pressure break test specimen; By the time test specimen completely fixed after, take mould apart and just obtained simulation pressure break test specimen.
in Fig. 1, according to the principle of similitude, the top board of former coal-bearing strata, coal petrography, base plate thickness are transformed in pressure break test specimen by the likelihood ratio, determine pressure break test specimen top board, coal petrography, base plate thickness; For example, the thick 3m of top board, the thick 4m in coal seam, the thick 3m of base plate, make the pressure break test specimen that 300mm is thick, simulates exactly the thick 90mm of top board, the thick 120mm of middle coal seam section, the thick 90mm of base plate.
Claims (1)
1.
a kind of coal bed gas well fracturing physical analogy test specimen, this a kind of coal bed gas well fracturing physical analogy test specimen comprises: simulation wellbore hole (1), simulation top board (2), Open-Hole Section (3), cement (4), coal petrography (5), simulation base plate (6), it is characterized in that: the upper strata in this kind of coal bed gas well fracturing physical analogy test specimen is provided with simulation top board (2), simulation top board (2) below is provided with simulation containing the coal petrography (5) in the section of coal seam, coal petrography (5) is provided with cement (4) around, and coal petrography (5) below is provided with simulation base plate (6); The middle part of test specimen model is provided with simulation wellbore hole (1), and simulation wellbore hole (1) is through simulating top board (2) to coal petrography (5) middle part; Simulation wellbore hole (1) below is provided with Open-Hole Section (3), and Open-Hole Section (3) is positioned at the middle part of coal petrography (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420148275.5U CN203847088U (en) | 2014-03-31 | 2014-03-31 | Physical simulation test piece of coal-bed gas well hydrofracture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420148275.5U CN203847088U (en) | 2014-03-31 | 2014-03-31 | Physical simulation test piece of coal-bed gas well hydrofracture |
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| Publication Number | Publication Date |
|---|---|
| CN203847088U true CN203847088U (en) | 2014-09-24 |
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| CN201420148275.5U Expired - Fee Related CN203847088U (en) | 2014-03-31 | 2014-03-31 | Physical simulation test piece of coal-bed gas well hydrofracture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946147A (en) * | 2019-04-03 | 2019-06-28 | 中国矿业大学 | A kind of coal measures composite reservoir pressure break physical analogy test material preparation method |
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2014
- 2014-03-31 CN CN201420148275.5U patent/CN203847088U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946147A (en) * | 2019-04-03 | 2019-06-28 | 中国矿业大学 | A kind of coal measures composite reservoir pressure break physical analogy test material preparation method |
| CN109946147B (en) * | 2019-04-03 | 2020-03-10 | 中国矿业大学 | Preparation method of coal-series composite reservoir fracturing physical simulation test piece |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150331 |
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| EXPY | Termination of patent right or utility model |