CN107676072A - A kind of CBM Fracturing technique for being applied to high steep coal seam - Google Patents
A kind of CBM Fracturing technique for being applied to high steep coal seam Download PDFInfo
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- CN107676072A CN107676072A CN201711078854.1A CN201711078854A CN107676072A CN 107676072 A CN107676072 A CN 107676072A CN 201711078854 A CN201711078854 A CN 201711078854A CN 107676072 A CN107676072 A CN 107676072A
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- proppant
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000003245 coal Substances 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 68
- 239000004576 sand Substances 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 38
- 239000002245 particle Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000006004 Quartz sand Substances 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 11
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 241000237858 Gastropoda Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 235000007926 Craterellus fallax Nutrition 0.000 description 1
- 240000007175 Datura inoxia Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to a kind of CBM Fracturing technique for being applied to high steep coal seam, the process of pressing crack construction includes pad stage, load fluid stage and displacement fluid stage, in the above three stage, compares fracturing technique using huge discharge fracturing technique, low sand；In pad stage and load fluid stage using change viscosity fracturing fluid technology and the more mechanical fraction proppant technologies of variable density；Sand technology is added using slug formula in the load fluid stage.The method of the present invention is applied to the high steep coalbed methane reservoir in southwest, solves the problems, such as due to easy sand plug, fracture support section difference caused by higher formation clination.The application of the Fracturing Technology, the coal bed gas of high steep reservoir is set effectively to be developed.
Description
Technical field
The invention belongs to Unconventional gas development field, is related to a kind of CBM Fracturing technique in suitable high steep coal seam.
Background technology
Coal bed gas belongs to Unconventional gas, and world's coal bed gas reserves account for the 1/3 of natural gas total quantity.China has pole
The coal bed gas resource reserves of horn of plenty, Coal bed gas project of the buried depth within 2000m are just suitable with the oil in place of natural gas.
China's coal bed gas has the characteristics that layer is more, layer is thin, pressure coefficient is low, permeability is low, saturation degree is low, heterogeneous strong.
The commercial development of coal bed gas is realized, storey increase design is necessary measure, and its Main Means is by hydraulic fracturing modification measures
To realize.
Southwestern China some areas higher formation clination, inclination angle are even up to 65~85 °, in hydraulic fracturing transformation process,
It may result in that shaft bottom double-vane waterpower fracture support is seriously uneven, and the crack upwardly extended along reservoir cannot preferably support,
And it is also easy to cause sand plug when constructing.
The present invention is for problem existing for high steep coalbed methane reservoir fracturing reform, by research of technique and field test, shape
Into the CBM Fracturing technology system in a set of suitable high steep coal seam.
The content of the invention
It is an object of the invention to provide a kind of CBM Fracturing technology system in suitable high steep coal seam, pressing crack construction
Process includes pad stage, load fluid stage and displacement fluid stage；
Huge discharge fracturing technique and low sand ratio fracturing technique are used in pad stage, and in above process using low
The proppant that the fracturing fluid of viscosity carries small particle carries out pressure break；
Huge discharge fracturing technique and low sand ratio fracturing technique are used in the load fluid stage, slug is used during pressure break
Formula adds sand technology, and is pressed in this stage using the proppant of highly viscous fracturing fluid carrying low-density medium grain size
Split.
Preferably, the huge discharge fracturing technique is in pressing crack construction process, using 6.0~12.0m3/ min discharge capacity
Fracturing fluid is pumped into stratum.
Preferably, the low sand is in pressing crack construction process than fracturing technique, will be supported using 3%~15% sand ratio
Agent is brought in stratum.
Preferably, average sand ratio is not higher than 10%.Led because the purpose of the application CBM Fracturing transformation is not configured to height
The crack of stream, thus It is not necessary to use high sand ratio, purpose of the above-mentioned sand than can both realize the application is also cost-saved.
Preferably, the slug formula adds sand technology to be in pressing crack construction process, replaces pump with insulating liquid using load fluid
Proppant is brought in stratum by the mode entered；Preferably, load fluid replaces 2~7 times with insulating liquid.I.e. in a manner of 2~7 slugs
Add sand, so operation is more beneficial for proppant transport to farther deeper inside.Insulating liquid described herein refers to not add branch
Support the load fluid of agent.
Preferably, the low viscosity fracturing fluid is active water fracturing fluid.In practical application, the active water pressure break is clear
Water, expansion-resisting agent and cleanup additive mix.
Preferably, the high viscosity fracturing fluid is linear fracturing fluid.The fracturing fluid of the viscosity higher in load fluid stage can
To reduce the sedimentation of proppant, proppant is migrated farther, improve support section.
Preferably, the proppant that pad stage adds is particle diameter 0.150~0.212mm quartz sands；In pad stage
Leak-off, Kong Zhaoxia and support microcrack can be reduced by adding a small amount of proppant.
Preferably, the proppant for the low-density medium grain size that the load fluid stage adds, which is taken, refers to that load fluid uses early stage
0.212~0.425mm low-density propping agents；The load fluid later stage uses 0.425~0.850mm quartz sand.In load fluid early stage
Addition low-density propping agent is mainly used in supporting time crack, and can reduce effect of settling in high steep coal seam, is pressing proppant
Split under the carrying of liquid, migrate farther, sanding is evenly；The load fluid later stage uses 0.425~0.850mm quartz sands, main to use
Flow conductivity in support waterpower major fracture and the nearly well crack of raising, supports near wellbore zone Thief zone major fracture.
Preferably, the apparent density of the low-density propping agent is 1.90~1.95g/cm3, bulk density is 1.2~1.3g/
cm3；Preferably, the apparent density of low-density propping agent is 1.91g/cm3, bulk density 1.25g/cm3。
Preferably, method of the invention comprises the following steps：
1) pad stage：Discharge capacity is used as 6.0~12.0m3/ min active water fracturing fluid carries out pressure break, in pressure break
During, intermittently add particle diameter be 0.150~0.212mm quartz sand, control during adding sand sand ratio be 3%~
9%；
2) the load fluid stage：Discharge capacity is used as 8.0~12.0m3/ min linear fracturing fluid carries out pressure break, the mistake of pressure break
Proppant is brought in into stratum by the way of load fluid replaces with insulating liquid and is pumped into journey；The proppant that load fluid uses early stage for
0.212~0.425mm of particle diameter, apparent density are 1.90~1.95g/cm3, bulk density is 1.2~1.3g/cm3Low-density support
Agent；The proppant that the load fluid later stage uses adds that sand ratio is controlled during sand is 8% for 0.425~0.850mm of particle diameter quartz sand
~15%；
3) the displacement fluid stage：Discharge capacity is used as 6.0~10.0m3/ min active water fracturing fluid, carry out pressing crack construction.
The method of the present invention has the advantages that：
1) due to the higher formation clination in high steep coal seam, using in general fracturing fluid and proppant, easy sand plug, fracture support are cutd open
Face is poor.The application using the linear fracturing fluid of certain viscosity and with the addition of the proppant of low-density in the load fluid stage, can carry
The prop-carrying capacity of high fracturing fluid, improve fracture support section.
2) the application, can by the overall fracturing technology of optimization, reasonably adjusting the fracturing operation in each period comprehensively
The pressure break to high steep coal bed gas is realized in the case where saving construction cost.
Brief description of the drawings
ZL~X wells casing program schematic diagram in Fig. 1 embodiments 1
ZL~X wells CBM Fracturing construction curve figure in Fig. 2 embodiments 1
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Embodiment 1
ZL~X coal bed gas wells are a bite high-inclination directional wells of Chongqing City Jiulongpo District, and higher formation clination, inclination angle is generally
68~75 ° (well diagram is shown in Fig. 1).On March 30th, 2016 carries out pressing crack construction to the well, and construction curve is as shown in Figure 2
Hydraulic fracture operating curve figure.
1) pad stage：Discharge capacity is used as 8.0m3/ min active water fracturing fluid carries out pressing crack construction, point three slugs
The quartz sand that interval addition particle diameter is 0.150~0.212mm, it is 3%~9% to control sand ratio；
2) the load fluid stage：Discharge capacity is used as 8.0m3/ min linear fracturing fluid carries out pressing crack construction, load fluid early stage
Using 0.212~0.425mm, apparent density is 1.90~1.95g/cm3, bulk density is 1.2~1.3g/cm3Low-density support
Agent；The load fluid later stage carries out pressing crack construction using 0.425~0.850mm quartz sand, and sand is than 9%~15%, average sand ratio
9.5%, one section of insulating liquid is injected in load fluid mid-term, proppant is taken to farther place, improves fracture support section；
3) the displacement fluid stage：Discharge capacity is used as 8.0m3/ min active water fracturing fluid, carry out pressing crack construction.
The well pressing crack construction is smooth, and the well methane output is stable in 2000m after 9 months3/d.Domestic the first high steep coal seam
Gas well fracturing transformation succeeds.
Although above the present invention is made to retouch in detail with general explanation, embodiment and experiment
State, but on the basis of the present invention, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, are belonged to claimed
Scope.
Claims (10)
1. a kind of CBM Fracturing technique for being applied to high steep coal seam, it is characterised in that the process of pressing crack construction includes prepad fluid
Stage, load fluid stage and displacement fluid stage；
Huge discharge fracturing technique and low sand ratio fracturing technique are used in pad stage, and uses low viscosity in above process
Fracturing fluid carry small particle proppant carry out pressure break；
Huge discharge fracturing technique and low sand ratio fracturing technique are used in the load fluid stage, is added during pressure break using slug formula
Sand technology, and pressure break is carried out using the proppant of highly viscous fracturing fluid carrying low-density medium grain size in this stage.
2. technique according to claim 1, it is characterised in that the huge discharge fracturing technique is in pressing crack construction process
In, using 6.0~12.0m3Fracturing fluid is pumped into stratum by/min discharge capacity.
3. technique according to claim 1 or 2, it is characterised in that the low sand is in pressing crack construction mistake than fracturing technique
Cheng Zhong, proppant is brought in stratum using 3%~15% sand ratio.
4. technique according to claim 3, it is characterised in that average sand ratio is not higher than 10%.
5. the technique according to claim 1 or 4, it is characterised in that the slug formula add sand technology be in the load fluid stage,
Proppant is brought in into stratum by the way of load fluid replaces with insulating liquid and is pumped into；Preferably, load fluid replace 2 with insulating liquid~
7 times.
6. technique according to claim 5, it is characterised in that the low viscosity fracturing fluid is active water fracturing fluid, and/
Or, the high viscosity fracturing fluid is linear fracturing fluid.
7. the technique according to claim 1 or 6, it is characterised in that the proppant of the small particle be particle diameter 0.150~
0.212mm quartz sand.
8. technique according to claim 7, it is characterised in that the proppant of the low-density medium grain size refers to, takes sand
Liquid uses particle diameter 0.212~0.425mm low-density propping agents early stage；The load fluid later stage uses 0.425~0.850mm of particle diameter stone
Sand.
9. technique according to claim 8, it is characterised in that the apparent density of the low-density propping agent be 1.9~
1.95g/cm3, bulk density is 1.2~1.3g/cm3。
10. according to the method described in any one of claim 1~9, it is characterised in that comprise the following steps：
1) pad stage：Discharge capacity is used as 6.0~12.0m3/ min active water fracturing fluid carries out pressure break, in the process of pressure break
In, the quartz sand that particle diameter is 0.150~0.212mm is intermittently added, it is 3%~9% that sand ratio is controlled during adding sand；
2) the load fluid stage：Discharge capacity is used as 8.0~12.0m3/ min linear fracturing fluid carries out pressure break, during pressure break
Proppant is brought in into stratum by the way of load fluid replaces with insulating liquid and is pumped into；The proppant that load fluid uses early stage is particle diameter
0.212~0.425mm, apparent density are 1.90~1.95g/cm3, bulk density is 1.2~1.3g/cm3Low-density propping agent；
The proppant that the load fluid later stage uses for 0.425~0.850mm of particle diameter quartz sand, add control during sand sand ratio for 8%~
15%；
3) the displacement fluid stage：Discharge capacity is used as 6.0~10.0m3/ min active water fracturing fluid, carry out pressing crack construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711078854.1A CN107676072A (en) | 2017-11-06 | 2017-11-06 | A kind of CBM Fracturing technique for being applied to high steep coal seam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711078854.1A CN107676072A (en) | 2017-11-06 | 2017-11-06 | A kind of CBM Fracturing technique for being applied to high steep coal seam |
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| Publication Number | Publication Date |
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| CN107676072A true CN107676072A (en) | 2018-02-09 |
Family
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| CN201711078854.1A Withdrawn CN107676072A (en) | 2017-11-06 | 2017-11-06 | A kind of CBM Fracturing technique for being applied to high steep coal seam |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661604A (en) * | 2018-05-30 | 2018-10-16 | 北京方圆天地油气技术有限责任公司 | A kind of method of adjacent formations fracturing reform exploiting coal bed methane |
| CN109138958A (en) * | 2018-07-26 | 2019-01-04 | 安东石油技术（集团）有限公司 | A kind of fracturing process of the complicated seam of tight sand gas reservoir |
| CN110055049A (en) * | 2019-06-04 | 2019-07-26 | 阳泉煤业（集团）有限责任公司 | A kind of proppant system preparation method for hydraulic fracturing |
| CN111456699A (en) * | 2020-04-08 | 2020-07-28 | 广州海洋地质调查局 | High-flow-guide through-layer fracturing method |
| CN112012711A (en) * | 2020-06-29 | 2020-12-01 | 中国石油天然气股份有限公司 | Fracturing method for highly deviated well |
| CN113550717A (en) * | 2020-04-23 | 2021-10-26 | 尹祖龙 | Coal bed gas fracturing device and using method thereof |
| CN113882845A (en) * | 2021-10-21 | 2022-01-04 | 中国石油化工股份有限公司 | Large-scale effective support fracturing method for coal bed gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288609A (en) * | 2017-08-15 | 2017-10-24 | 贵州省非常规天然气勘探开发利用工程研究中心有限公司 | A kind of fracture technology suitable for high-dip structure coal seam |
-
2017
- 2017-11-06 CN CN201711078854.1A patent/CN107676072A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288609A (en) * | 2017-08-15 | 2017-10-24 | 贵州省非常规天然气勘探开发利用工程研究中心有限公司 | A kind of fracture technology suitable for high-dip structure coal seam |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661604A (en) * | 2018-05-30 | 2018-10-16 | 北京方圆天地油气技术有限责任公司 | A kind of method of adjacent formations fracturing reform exploiting coal bed methane |
| CN109138958A (en) * | 2018-07-26 | 2019-01-04 | 安东石油技术（集团）有限公司 | A kind of fracturing process of the complicated seam of tight sand gas reservoir |
| CN110055049A (en) * | 2019-06-04 | 2019-07-26 | 阳泉煤业（集团）有限责任公司 | A kind of proppant system preparation method for hydraulic fracturing |
| CN110055049B (en) * | 2019-06-04 | 2021-05-28 | 阳泉煤业（集团）有限责任公司 | Preparation method of proppant system for hydraulic fracturing |
| CN111456699A (en) * | 2020-04-08 | 2020-07-28 | 广州海洋地质调查局 | High-flow-guide through-layer fracturing method |
| CN113550717A (en) * | 2020-04-23 | 2021-10-26 | 尹祖龙 | Coal bed gas fracturing device and using method thereof |
| CN112012711A (en) * | 2020-06-29 | 2020-12-01 | 中国石油天然气股份有限公司 | Fracturing method for highly deviated well |
| CN112012711B (en) * | 2020-06-29 | 2022-12-02 | 中国石油天然气股份有限公司 | Fracturing method for highly deviated well |
| CN113882845A (en) * | 2021-10-21 | 2022-01-04 | 中国石油化工股份有限公司 | Large-scale effective support fracturing method for coal bed gas |
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Application publication date: 20180209 |