CN106869889A - A kind of granulated coal CBM Fracturing method - Google Patents
A kind of granulated coal CBM Fracturing method Download PDFInfo
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- CN106869889A CN106869889A CN201710058147.XA CN201710058147A CN106869889A CN 106869889 A CN106869889 A CN 106869889A CN 201710058147 A CN201710058147 A CN 201710058147A CN 106869889 A CN106869889 A CN 106869889A
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- 239000003245 coal Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 112
- 239000004576 sand Substances 0.000 claims abstract description 75
- 238000001802 infusion Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000037361 pathway Effects 0.000 claims abstract description 7
- 239000010453 quartz Substances 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000011148 porous material Substances 0.000 claims description 11
- 235000013312 flour Nutrition 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 6
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 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
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
-
- 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of granulated coal CBM Fracturing process, optimizes perforating parameter, and feed pathway is set up in regular coal seam section；In whole fracturing process, increase the use ratio of preposition liquid measure, preposition liquid measure increases to the 45 55% of fracturing fluid total amount, first infusion accounts for the pure fracturing fluid of fracturing fluid total amount 20 25%, infusion prepad fluid adds sand slug afterwards, and then load fluid adds sand slug supporting crack, sand-blockage, last infusion displacement fluid, the present invention effectively instructs granulated coal CBM Fracturing to transform by optimizing and revising the modes such as perforating parameter, optimization infusion program.
Description
Technical field
The present invention relates to CBM exploration and development fracturing engineering technical field, more particularly to a kind of granulated coal CBM Fracturing
Method.
Background technology
1st, pressure break is the important measures of coalbed methane reservoir storey increase design, broken by the constructivity of stress rupture for primary structure
Beans, only by targetedly fracturing reform, can effective exploitation.
2nd, granulated coal Coal Pore Structure layer rationality suffers heavy damage, and coal bed texture, construction, composition, cleat change
Become, crack is interlaced in layer, coal seam is overall loose, and there are a large amount of coal dusts, there are many difficulties in fracturing reform.
3rd, the method for existing transformation granulated coal mainly uses conventional sandstone gas reservoir fracturing technology, i.e., after coal seam section perforation,
To coal seam infusion highly pressurised liquid and proppant, extended and support with obtaining coal seam internal fissure, set up gas flow passage.
4th, in practice of construction case, conventional hydraulic fracturing process fails the transformation effect for having obtained in granulated coal transformation
Really.It is mainly shown as：Fracturing Pressure is high, wastes fracturing unit power；Particle coal seam is loose, and fluid loss is serious, efficiency
It is low；Fracture extension is limited；There is sand plug risk in construction；Crack easily closure etc. after pressure.
The content of the invention
In order to overcome the defect of above-mentioned prior art, the present invention to provide a kind of granulated coal CBM Fracturing process, lead to
Cross and optimize and revise the modes such as perforating site, optimization infusion program, effectively instruct granulated coal CBM Fracturing to transform.
In order to achieve the above object, the technical scheme is that：
A kind of granulated coal CBM Fracturing method, comprises the following steps：
(1) perforating site, is optimized：Perforating site selects the metastable lump coal of Coal Pore Structure and fragmentation coal, is stablizing coal
Interval sets up feed pathway；
(2) infusion program, is optimized：In whole fracturing process, according to fracturing fluid in the effect of different phase, order respectively
Entitled prepad fluid, load fluid and displacement fluid；
(1) use ratio of preposition liquid measure, is increased, preposition liquid measure increases to the 45-55% of fracturing fluid total amount, and first infusion is accounted for
The pure fracturing fluid of fracturing fluid total amount 20-25%, rear infusion prepad fluid adds sand slug, prepad fluid to add sand slug to drop frictional resistance, filtrate reducing,
Concretely comprise the following steps：After the pure fracturing fluid of 1 hole volume of infusion, then 1 hole volume of infusion fracturing fluid+proppant A, so
Repeatedly, it is desirable to which prepad fluid adds sand slug numerical control system at 3-5, and sand ratio is gradually incremented to 10% from 3%；
(2), load fluid adds sand slug supporting crack, sand-blockage, load fluid to add sand to enter stratum, i.e. infusion 1 with slug formula
After the pure fracturing fluid of individual hole volume, then 1 hole volume of infusion fracturing fluid+proppant B or proppant C, so repeatedly,
Ask load fluid plus sand slug numerical control system at 5-7, sand ratio is gradually incremented to 15% from 5%；
(3), infusion displacement fluid：One displacement fluid of hole volume of infusion, replaces load fluid and enters stratum, promotes proppant
B or proppant C builds water conservancy diversion crack high in nearly well band, is that gas output sets up passage, so completes whole infusion program.
Described fracturing fluid is active water, i.e. clear water+1~2% Klorvess Liquid.
Described proppant A is 70-140 mesh quartz flour sand.
Described proppant B is 40-70 mesh quartz fine sand.
Described proppant C is 20-40 mesh quartz coarse sand.
Advantages of the present invention is：
1st, perforating site optimization：It is preferred that Coal Pore Structure is with respect to settling position perforation, be conducive to cracking initiation and extension, open
Follow-up feed pathway.Prioritizing selection Coal Pore Structure regular coal seam section perforation of the present invention, is different from conventional preferably air content high, natural
The mode of fracture development coal seam section, with reference to preposition liquid measure process characteristic is subsequently increased, can throw effectively facilitate lump coal (granulated coal) and
Crack between granulated coal is linked up, and establishes good gas flow passage.
2nd, infusion program is optimized：1. using the preposition liquid measure ratio of increase, increase the new method that flour sand is used, be conducive to preposition
Liquid makes seam in the metastable coal seam section of Coal Pore Structure, promotes cracking initiation and extension；Increase flour sand using be conducive to polish well
Cylinder inwall and perforation eye, reduce frictional resistance, reduce operation pressure, while stratum leak-off can be reduced effectively, lift follow-up pressure break
Liquid efficiency, for enhancing correctional effect lays the foundation.2. load fluid slug formula add sand can effective supporting crack, built in nearly well band
Water conservancy diversion crack high, is that gas output sets up passage, meanwhile, slug formula adds the sand can effectively to prevent stratum sand plug, reduces construction wind
Danger.3. the infusion program described in this method is set out from stratum leak-off, the angle in rear support crack is first reduced, and increases prepad fluid use
Amount, increased the use of flour sand, conventional infusion program is different from based on load fluid, based on fine sand, coarse sand supporting crack
The thinking of syllabus, can reduce sand plug risk and particle coal seam section crack quick-make that fine sand, coarse sand directly enter stratum
May, follow-up load fluid fluid efficiency is effectively lifted, increase crack net pressure, promote the formation and support of major fracture.
Specific embodiment
The present invention is described in detail below.
First, perforating site is optimized：Usual coal seam section has what the difference Coal Pore Structure such as granulated coal, fragmentation coal, lump coal coexisted
Phenomenon, perforating site the selection metastable lump coal of Coal Pore Structure and fragmentation coal, sets up feed pathway, favorably in regular coal seam section
Effectively opened in crack and preferably extended.
The well coal seam section up and down each 1/5 be lump coal, middle part 3/5 be granulated coal, Coal Pore Structure is relatively steady at perforation preferably two
Fixed lump coal position carries out operation, is that crack effectively extension creates conditions by optimizing perforating site.Using 102 perforating guns, penetrate
16 holes of hole density/rice, 60 ° of phase angle.
2nd, infusion program is optimized：Infusion program is used to instruct whole fracturing process, and optimization infusion program mainly includes following
Main points：
(1) preposition liquid measure ratio is increased, prepad fluid consumption increases to 53% (side of preposition liquid measure 244, pressure of fracturing fluid total amount
Split the side of liquid total amount 460).During specific implementation, first infusion a certain amount of fracturing fluid 100 side accounts for the 21.7% of fracturing fluid total amount,
Infusion prepad fluid adds sand slug (144 side) afterwards, accounts for the 31.3% of fracturing fluid total amount.(prepad fluid adds sand slug to drop frictional resistance, drop filter
Lose.After prepad fluid adds sand to enter stratum, the i.e. pure fracturing fluid of 1 hole volume of infusion with slug formula, then 1 hole volume of infusion
Fracturing fluid+70-140 mesh quartz flour sand；So repeatedly, this well prepad fluid adds sand slug number for 3, and sand ratio is gradually passed from 3%
Increase to 8%.
(2) load fluid adds sand slug supporting crack, sand-blockage, load fluid to add sand to enter stratum, i.e. infusion 1 with slug formula
After the pure fracturing fluid of hole volume, then the fracturing fluid+fine sand or coarse sand of 1 hole volume of infusion are proppant B or proppant C,
So repeatedly, this well load fluid adds sand slug numerical control to be made as 6, and sand ratio is gradually incremented to 15% from 6%.Described proppant B
It is 40-70 mesh quartz fine sand；Described proppant C is 20-40 mesh quartz coarse sand.
(3) infusion displacement fluid：One displacement fluid of hole volume of infusion, replaces load fluid and enters stratum, promotes coarse sand to exist
Nearly well band builds water conservancy diversion crack high, is that gas output sets up passage, so completes whole infusion program.
Described fracturing fluid is active water, i.e. clear water+1~2% Klorvess Liquid.
Described proppant A is 70-140 mesh quartz flour sand.
Described proppant B is 40-70 mesh quartz fine sand.
Described proppant C is 20-40 mesh quartz coarse sand.
Under the guidance of this process, the fracturing reform work in the well particle coal seam is efficiently accomplished.The current well is obtained
The yield of 1500 sides/day, in the fixed output quota test of nearly 3 months, stable yield, aquifer yield and pressure drop parameter are normal, obtain west
The new breakthrough of southern area CBM exploration and development.
Embodiment two
A kind of granulated coal CBM Fracturing method, comprises the following steps：
(1) perforating parameter, is optimized：Perforating site selects the metastable lump coal of Coal Pore Structure and fragmentation coal, is stablizing coal
Interval sets up feed pathway, specific to use 102 rifles, shot density selection 16 holes/rice, 60 ° of phase angle；
(2) infusion program, is optimized：In whole fracturing process, according to fracturing fluid in the effect of different phase, order respectively
Entitled prepad fluid, load fluid and displacement fluid；
(1) the use ratio of preposition liquid measure, is increased, preposition liquid measure increases to the 45-55% of fracturing fluid total amount, and first infusion accounts for pressure
The pure fracturing fluid of liquid total amount 25% is split, rear infusion prepad fluid adds sand slug, prepad fluid to add sand slug to drop frictional resistance, filtrate reducing, specifically
Step is：After the pure fracturing fluid of 1 hole volume of infusion, then 1 hole volume of infusion fracturing fluid+proppant A, it is so anti-
It is multiple, it is desirable to which that prepad fluid adds sand slug numerical control system at 5, and sand ratio is gradually incremented to 10% from 3%；
(2), load fluid adds sand slug supporting crack, sand-blockage, load fluid to add sand to enter stratum, i.e. infusion 1 with slug formula
After the pure fracturing fluid of individual hole volume, then 1 hole volume of infusion fracturing fluid+proppant B, so repeatedly, it is desirable to load fluid
Plus sand slug numerical control system, at 7, sand ratio is gradually incremented to 15% from 5%；
(3), infusion displacement fluid：One displacement fluid of hole volume of infusion, replaces load fluid and enters stratum, promotes proppant
B builds water conservancy diversion crack high in nearly well band, is that gas output sets up passage, so completes whole infusion program.
Described fracturing fluid is active water, i.e. clear water+1~2% Klorvess Liquid.
Described proppant A is 70-140 mesh quartz flour sand.
Described proppant B is 40-70 mesh quartz fine sand.
The present embodiment efficiently accomplishes the fracturing reform work in the well particle coal seam, stable yield, aquifer yield and pressure drop parameter
Normally, the new breakthrough of CBM exploration and development is obtained.
Embodiment three
A kind of granulated coal CBM Fracturing method, comprises the following steps：
(1) perforating parameter, is optimized：Perforating site selects the metastable lump coal of Coal Pore Structure and fragmentation coal, is stablizing coal
Interval sets up feed pathway, specific to use 89 rifles, shot density selection 16 holes/rice, 60 ° of phase angle；
(2) infusion program, is optimized：In whole fracturing process, according to fracturing fluid in the effect of different phase, order respectively
Entitled prepad fluid, load fluid and displacement fluid；
(1) the use ratio of preposition liquid measure, is increased, preposition liquid measure increases to the 45-55% of fracturing fluid total amount, and first infusion accounts for pressure
The pure fracturing fluid of liquid total amount 20% is split, rear infusion prepad fluid adds sand slug, prepad fluid to add sand slug to drop frictional resistance, filtrate reducing, specifically
Step is：After the pure fracturing fluid of 1 hole volume of infusion, then 1 hole volume of infusion fracturing fluid+proppant A, it is so anti-
It is multiple, it is desirable to which that prepad fluid adds sand slug numerical control system at 4, and sand ratio is gradually incremented to 10% from 3%；
(2), load fluid adds sand slug supporting crack, sand-blockage, load fluid to add sand to enter stratum, i.e. infusion 1 with slug formula
After the pure fracturing fluid of individual hole volume, then 1 hole volume of infusion fracturing fluid+proppant C, so repeatedly, it is desirable to load fluid
Plus sand slug numerical control system, at 5, sand ratio is gradually incremented to 15% from 5%；
(3), infusion displacement fluid：One displacement fluid of hole volume of infusion, replaces load fluid and enters stratum, promotes proppant
C builds water conservancy diversion crack high in nearly well band, is that gas output sets up passage, so completes whole infusion program.
Described fracturing fluid is active water, i.e. clear water+1~2% Klorvess Liquid.
Described proppant A is 70-140 mesh quartz flour sand.
Described proppant C is 20-40 mesh quartz coarse sand.
The present embodiment efficiently accomplishes the fracturing reform work in the well particle coal seam, stable yield, aquifer yield and pressure drop parameter
Normally, the new breakthrough of CBM exploration and development is obtained.
Claims (5)
1. a kind of granulated coal CBM Fracturing method, it is characterised in that comprise the following steps：
(1) perforating site, is optimized：Perforating site selects the metastable lump coal of Coal Pore Structure and fragmentation coal, in regular coal seam section
Set up feed pathway；
(2) infusion program, is optimized：In whole fracturing process, according to fracturing fluid in the effect of different phase, it is respectively designated as
Prepad fluid, load fluid and displacement fluid；
(1) the use ratio of preposition liquid measure, is increased, preposition liquid measure increases to the 45-55% of fracturing fluid total amount, and first infusion accounts for fracturing fluid
The pure fracturing fluid of total amount 20-25%, rear infusion prepad fluid adds sand slug, prepad fluid to add sand slug to drop frictional resistance, filtrate reducing, specific step
Suddenly it is：After the pure fracturing fluid of 1 hole volume of infusion, then 1 hole volume of infusion fracturing fluid+proppant A, so repeatedly,
It is required that prepad fluid adds sand slug numerical control system at 3-5, sand ratio is gradually incremented to 10% from 3%；
(2), load fluid adds sand slug supporting crack, sand-blockage, load fluid to add sand to enter stratum, i.e. 1 well of infusion with slug formula
Cylinder volume pure fracturing fluid after, then 1 hole volume of infusion fracturing fluid+proppant B or proppant C, so repeatedly, it is desirable to take
Sand liquid adds sand slug numerical control system at 5-7, and sand ratio is gradually incremented to 15% from 5%；
(3), infusion displacement fluid：One displacement fluid of hole volume of infusion, replaces load fluid and enters stratum, promote proppant B or
Proppant C builds water conservancy diversion crack high in nearly well band, is that gas output sets up passage, so completes whole infusion program.
2. a kind of granulated coal CBM Fracturing method according to claim 1, it is characterised in that described fracturing fluid is to live
Property water, i.e. clear water+1~2% Klorvess Liquid.
3. a kind of granulated coal CBM Fracturing method according to claim 1, it is characterised in that described proppant A is
70-140 mesh quartz flour sand.
4. a kind of granulated coal CBM Fracturing method according to claim 1, it is characterised in that described proppant B is
40-70 mesh quartz fine sand.
5. a kind of granulated coal CBM Fracturing method according to claim 1, it is characterised in that described proppant C is
20-40 mesh quartz coarse sand.
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| CN201710058147.XA CN106869889A (en) | 2017-01-23 | 2017-01-23 | A kind of granulated coal CBM Fracturing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630692A (en) * | 2017-09-07 | 2018-01-26 | 北京泰坦通源天然气资源技术有限公司 | The temporary stall of man-made fracture is to fracturing process in a kind of layer of coal bed gas well |
| 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 |
| CN109751034A (en) * | 2017-11-01 | 2019-05-14 | 中国石油化工股份有限公司 | A kind of oil-gas reservoir fracturing sand feeding method |
| CN110714747A (en) * | 2019-10-21 | 2020-01-21 | 中国石油化工股份有限公司 | Three-step control method for improving shale transformation volume |
| CN111946319A (en) * | 2020-08-20 | 2020-11-17 | 中国石油天然气股份有限公司 | Sand adding method for fracturing transformation |
| CN112267867A (en) * | 2020-09-07 | 2021-01-26 | 中石油煤层气有限责任公司 | Deep coal bed gas well volume acidizing fracturing method |
| CN113236219A (en) * | 2021-05-31 | 2021-08-10 | 重庆地质矿产研究院 | Coal bed gas fracturing method suitable for multiple sets of high and steep crushed coal beds |
| CN115653557A (en) * | 2022-10-14 | 2023-01-31 | 延长油田股份有限公司吴起采油厂 | Compact oil reservoir pressure-flooding energy-increasing integrated development process |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630692A (en) * | 2017-09-07 | 2018-01-26 | 北京泰坦通源天然气资源技术有限公司 | The temporary stall of man-made fracture is to fracturing process in a kind of layer of coal bed gas well |
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| CN109751034B (en) * | 2017-11-01 | 2022-03-15 | 中国石油化工股份有限公司 | Fracturing sand adding method for oil and gas reservoir |
| 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 |
| CN110714747A (en) * | 2019-10-21 | 2020-01-21 | 中国石油化工股份有限公司 | Three-step control method for improving shale transformation volume |
| CN111946319A (en) * | 2020-08-20 | 2020-11-17 | 中国石油天然气股份有限公司 | Sand adding method for fracturing transformation |
| CN111946319B (en) * | 2020-08-20 | 2023-01-10 | 中国石油天然气股份有限公司 | Sand adding method for fracturing modification |
| CN112267867A (en) * | 2020-09-07 | 2021-01-26 | 中石油煤层气有限责任公司 | Deep coal bed gas well volume acidizing fracturing method |
| CN113236219A (en) * | 2021-05-31 | 2021-08-10 | 重庆地质矿产研究院 | Coal bed gas fracturing method suitable for multiple sets of high and steep crushed coal beds |
| CN115653557A (en) * | 2022-10-14 | 2023-01-31 | 延长油田股份有限公司吴起采油厂 | Compact oil reservoir pressure-flooding energy-increasing integrated development process |
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Application publication date: 20170620 |