CN107288609A - A kind of fracture technology suitable for high-dip structure coal seam - Google Patents
A kind of fracture technology suitable for high-dip structure coal seam Download PDFInfo
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- CN107288609A CN107288609A CN201710697552.6A CN201710697552A CN107288609A CN 107288609 A CN107288609 A CN 107288609A CN 201710697552 A CN201710697552 A CN 201710697552A CN 107288609 A CN107288609 A CN 107288609A
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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
- 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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Abstract
The invention belongs to coal bed fracturing renovation technique field, in particular to a kind of fracture technology suitable for high-dip structure coal seam, comprise the following steps：A, it is pumped into prepad fluid；Prepad fluid includes prepad fluid proppant and prepad fluid fracturing fluid, and prepad fluid proppant is the quartzy flour sand of 70 100 mesh, and prepad fluid fracturing fluid is active water fracturing fluid；B, it is pumped into load fluid；Early stage load fluid proppant is 40 70 mesh low-density fine sands, and early stage load fluid fracturing fluid is active water fracturing fluid；Later stage load fluid proppant is sand in 20 40 mesh quartz, and later stage load fluid fracturing fluid includes linear fracturing fluid and biology enzyme low temperature gel breaker；C, it is pumped into displacement fluid；Displacement fluid is active water fracturing fluid.The high-dip structure coal bed fracturing renovation technique that the present invention is provided is using change particle diameter proppant combination technique and active water fracturing fluid+linear fracturing fluid combination technique, the problem such as easy sand plug, supporting crack radius are short when solving high steep coal bed fracturing, coal seam transformation is insufficient, improves coal bed gas well gas production.
Description
Technical field
The present invention relates to a kind of fracture technology suitable for high-dip structure coal seam, belong to coal bed fracturing renovation technique neck
Domain.
Background technology
China's cbm development is still in exploratory stage, the still prematurity of correlation theory technology.There is low hole because of coal seam, it is ultralow
Ooze, the features such as anisotropism is strong, so coal bed gas well improves coal bed gas oozing in well only by artificial hydraulic fracturing technology
Circulation road, could obtain the industrial production capacity with extraction value.And in south China, especially Guizhou In The Northwest Guizhou, ground end
The Coal bed gas project very abundant contained in coal seam, but this area because tectonic movement is formd substantial amounts of high-dip structure coal
Layer, makes the exploitation faces enormous challenge of this area's coal bed gas.Compared with conventional coal seam, high-dip structure coal seam, which generally has, buries
Deeply, the characteristics of inclination angle is big, anisotropy is strong, therefore there are larger technological difficulties for the fracturing reform in high-dip structure coal seam.
Active water sand fracturing, proppant grain are typically used currently for the artificial hydraulic fracturing renovation technique in common coal seam
Footpath is that 70~40 mesh and 40~20 mesh mixing particle diameters are constituted, and sand accounts for more than the 70% of proppant total amount in quartz.But for
For the fracturing reform in high-dip structure coal seam, due to being influenceed by gravity, near wellbore zone being gathered in high density proppants, if should more
With the artificial hydraulic fracturing renovation technique in common coal seam fracturing fluid leak can be caused serious, sand plug occur, cause supporting crack half
Footpath is short, and is unfavorable for effective support in secondary crack, makes coal bed fracturing correctional effect undesirable.
The content of the invention
The invention provides a kind of fracture technology suitable for high-dip structure coal seam, it is intended that solving existing
The above mentioned problem that technology is present.
Technical scheme is as follows：
The invention provides a kind of fracture technology suitable for high-dip structure coal seam, comprise the following steps：
A, prepad fluid of the sand than 3%-9% is injected into coal bed gas well using pressure break pump truck；Prepad fluid includes prepad fluid branch
Agent and prepad fluid fracturing fluid are supportted, prepad fluid proppant is the quartzy flour sand of 70-100 mesh, and prepad fluid fracturing fluid is active water fracturing fluid,
The wherein quartzy flour sand weight ratio of 70-100 mesh is 20%-30%；
B, load fluid of the sand than 8%-15% is injected into coal bed gas well using pressure break pump truck；Load fluid is divided into early stage and taken again
Sand liquid and later stage load fluid, early stage load fluid include early stage load fluid proppant and early stage load fluid fracturing fluid, later stage load fluid
Including later stage load fluid proppant and later stage load fluid fracturing fluid；
Early stage load fluid proppant is 40-70 mesh low-density fine sands, and early stage load fluid fracturing fluid is active water fracturing fluid, its
Middle 40-70 mesh low-density fine sand weight ratio is 30%-40%；
Later stage load fluid proppant be 20-40 mesh quartz in sand, later stage load fluid fracturing fluid include linear fracturing fluid and
Sand weight ratio is 40%-50% in biology enzyme low temperature gel breaker, wherein 20-40 mesh quartz；
C, using pressure break pump truck displacement fluid is injected into coal bed gas well；Displacement fluid is active water fracturing fluid.
In the embodiment that the present invention is provided, in above-mentioned steps A, prepad fluid accounts for the 50%-60% for being pumped into total liquid measure.
In the embodiment that the present invention is provided, in above-mentioned steps A, active water fracturing fluid includes clear water, expansion-resisting agent KCL and (contained
Measure as 1%-2%) and cleanup additive (content is 0.2%-0.3%).
In the embodiment that the present invention is provided, in above-mentioned steps B, into coal bed gas well, injection load fluid is divided into following two again
Step：
(1) early stage load fluid is injected, for supporting secondary crack；
(2) later stage load fluid is injected, for supporting waterpower major fracture.
In the embodiment that the present invention is provided, in above-mentioned steps B, linear fracturing fluid includes clear water, expansion-resisting agent KCL and (contained
Measure as 1%-2%), cleanup additive (content is 0.2%-0.3%) and hydroxypropyl guanidine your glue (content is 0.3%-0.35%), linearly
The viscosity of fracturing fluid is 30-35cp, and it accounts for the 20%-25% for being pumped into total liquid measure.
In the embodiment that the present invention is provided, in above-mentioned steps B, biology enzyme low temperature gel breaker concentration is 0.0005%-
0.0005%.
In the embodiment that the present invention is provided, expansion-resisting agent KCL's contains in above-mentioned active water fracturing fluid and linear fracturing fluid
Measure and determined by the natural gamma value (GR) of coal seam well fracturing section：
If GR≤45API, KCL content are 1%；
If 45API ＜ GR≤60API, KCL contents are 1.5%；
If 60API ＜ GR, KCL content are 2%.
In the embodiment that the present invention is provided, the discharge capacity of above-mentioned fracturing pump is 6m3/min-8m3/min。
In the embodiment that the present invention is provided, every meter of coal seam thickness sand feeding amount is 9m3-10m3, pressurize and split liquid measure (active water
Fracturing fluid and linear fracturing fluid) it is 200m3-250m3。
Beneficial effects of the present invention are：The present invention is using particle diameter proppant combination technique is become, and quartzy flour sand, which is used to reduce, presses
Liquid leak-off, Kong Zhaoxia and support microcrack are split, low-density fine sand is used to support sand in secondary crack, quartz to be used to support waterpower
Major fracture, improves fracture condudtiviy, and multistage when solving high-dip structure coal bed gas well pressure break crack is effectively supported, coal seam changes
Make insufficient technological difficulties；Fracturing fluid of the present invention is using active water fracturing fluid+linear fracturing fluid combination technique, in maximum limit
Under conditions of degree reduces fracturing fluid to coal seam pollution, the prop-carrying capacity of fracturing fluid is improved, the leak-off of fracturing fluid is reduced, solves coal
Layer gas well short technological difficulties of easy sand plug, supporting crack radius in fracturing reform.
Embodiment
Based on the embodiment in the present invention, those of ordinary skill in the art institute under the premise of creative work is not made
The all other embodiment obtained, belongs to the scope of protection of the invention.
The invention provides a kind of fracture technology suitable for high-dip structure coal seam, comprise the following steps：
A, prepad fluid of the sand than 3%-9% is injected into coal bed gas well using pressure break pump truck；Prepad fluid includes prepad fluid branch
Agent and prepad fluid fracturing fluid are supportted, prepad fluid proppant is the quartzy flour sand of 70-100 mesh, and prepad fluid fracturing fluid is active water fracturing fluid,
The wherein quartzy flour sand weight ratio of 70-100 mesh is 20%-30%；
B, load fluid of the sand than 8%-15% is injected into coal bed gas well using pressure break pump truck；Load fluid is divided into early stage and taken again
Sand liquid and later stage load fluid, early stage load fluid include early stage load fluid proppant and early stage load fluid fracturing fluid, later stage load fluid
Including later stage load fluid proppant and later stage load fluid fracturing fluid；
Early stage load fluid proppant is 40-70 mesh low-density fine sands, and early stage load fluid fracturing fluid is active water fracturing fluid, its
Middle 40-70 mesh low-density fine sand weight ratio is 30%-40%；
Later stage load fluid proppant be 20-40 mesh quartz in sand, later stage load fluid fracturing fluid include linear fracturing fluid and
Sand weight ratio is 40%-50% in biology enzyme low temperature gel breaker, wherein 20-40 mesh quartz；
C, using pressure break pump truck displacement fluid is injected into coal bed gas well；Displacement fluid is active water fracturing fluid.
Specifically, in the embodiment that the present invention is provided, the quartzy flour sand of above-mentioned 70-100 mesh rubs for reducing leak-off, eyelet
Resistance and support microcrack；Above-mentioned 40-70 mesh low-density fine sand is used to support secondary crack；Sand is used to support in 20-40 mesh quartz
Waterpower major fracture and the flow conductivity for improving nearly well crack.
In the embodiment that the present invention is provided, in above-mentioned steps A, prepad fluid accounts for the 50%-60% for being pumped into total liquid measure.
In the embodiment that the present invention is provided, in above-mentioned steps B, into coal bed gas well, injection load fluid is divided into following two again
Step：
(1) early stage load fluid is injected, for supporting secondary crack；
(2) later stage load fluid is injected, for supporting waterpower major fracture.
In the embodiment that the present invention is provided, above-mentioned active water fracturing fluid includes clear water, (content is 1%- to expansion-resisting agent KCL
2%) with cleanup additive (content is 0.2%-0.3%).
In the embodiment that the present invention is provided, above-mentioned linear fracturing fluid includes clear water, (content is 1%- to expansion-resisting agent KCL
2%), cleanup additive (content is 0.2%-0.3%) and hydroxypropyl guanidine that glue (content is 0.3%-0.35%), linear fracturing fluid
Viscosity be 30-35cp, and account for the 20%-25% for being pumped into total liquid measure.
In the embodiment that the present invention is provided, above-mentioned biology enzyme low temperature gel breaker concentration is 0.0005%-0.0006%.It is raw
Thing enzyme low temperature gel breaker is used to ensure that linear fracturing fluid is the low viscous body of low temperature, is led with the row of returning for improving linear fracturing fluid, most
Limits reduce injury of the linear fracturing fluid to coal seam.
In the embodiment that the present invention is provided, cleanup additive is anion surfactant.
In the embodiment that the present invention is provided, expansion-resisting agent KCL's contains in above-mentioned active water fracturing fluid and linear fracturing fluid
Measure and determined by the natural gamma value (GR) of coal seam well fracturing section：
If GR≤45API, KCL content are 1%；
If 45API ＜ GR≤60API, KCL contents are 1.5%；
If 60API ＜ GR, KCL content are 2%.
In the embodiment that the present invention is provided, above-mentioned pressing crack construction discharge capacity is 6m3/min-8m3/min。
In the embodiment that the present invention is provided, every meter of coal seam thickness sand feeding amount is 9m3-10m3, pressurize and split liquid measure (active water
Fracturing fluid and linear fracturing fluid) it is 200m3-250m3。
It is also understood that above-mentioned total liquid measure be the total liquid measure of fracturing fluid, as prepad fluid fracturing fluid, load fluid fracturing fluid and
Displacement fluid three's volume sum.
With reference to embodiment, the present invention is further described.
Embodiment
Guizhou In The Northwest Guizhou W wells are the coal bed gas well of high-dip structure, about 68 ° of seam inclination.Fracturing section coal seam thickness
For 6.0m, nature of coal seam gamma value average (GR) is 65API.The high-dip structure then provided using the present invention the W wells fracturing section
What coal bed fracturing renovation technique was constructed comprises the following steps that：
Because coal seam thickness is 6.0m, every meter of design sand feeding amount 9.5m3, common 57m3, it is pumped into fracturing fluid 1200m3, wherein living
Property water fracturing fluid 900m3, linear fracturing fluid 300m3。
A, prepad fluid of the sand than 3%-9% is injected into coal bed gas well using pressure break pump truck；Wherein 70-100 mesh silica flour
Sand proppant 13.5m3, active water fracturing fluid 690m in prepad fluid3, prepad fluid, which is accounted for, is pumped into the 57.5% of total liquid measure.
B, load fluid of the sand than 8%-15% is injected into coal bed gas well using pressure break pump truck；
In early stage load fluid, 40-70 mesh low-density fine sand proppants 20.5m3, active water fracturing fluid 221.3m3；
In later stage load fluid, sand proppant 23m in 20-40 mesh quartz3, linear fracturing fluid 280m3；Linear glue laminated is split
Fluid viscosity 35cp, linear fracturing fluid, which is accounted for, is pumped into the 25% of total liquid measure.
C, using fracturing pump displacement fluid is injected into coal bed gas well；Displacement fluid is active water fracturing fluid, common 8.7m3。
Specifically, in the embodiment that the present invention is provided, above-mentioned pressing crack construction discharge capacity is 8m3/min。
Due to coal seam in the present embodiment natural gamma value average be 65API, i.e. 60API ＜ GR, then KCL contents should be
2%.So the formula of above-mentioned active water fracturing fluid and linear fracturing fluid is as follows：
Specifically, in the present embodiment, above-mentioned active water fracturing fluid includes clear water, KCL (content is 2%) and cleanup additive
(content is 0.2%)；
Specifically, in the present embodiment, above-mentioned linear fracturing fluid includes clear water, KCL (content is 2%), cleanup additive and (contained
0.2%) and hydroxypropyl guanidine your glue measure as (content is 0.30%).
Specifically, in this embodiment, the biology enzyme low temperature gel breaker concentration added in linear fracturing fluid is 0.0006%.
This well stable gas production after above method fracturing reform reaches 2000m3/ d, it may be said that bright to use the technology
High-dip structure coal seam artificial fracturing crack is effectively supported, fully transformation is realized.
Beneficial effects of the present invention are：The present invention is using particle diameter proppant combination technique is become, and quartzy flour sand, which is used to reduce, presses
Liquid leak-off, Kong Zhaoxia and support microcrack are split, low-density fine sand is used to support sand in secondary crack, quartz to be used to support waterpower
Major fracture, improves fracture condudtiviy, and multistage when solving high-dip structure coal bed gas well pressure break crack is effectively supported, coal seam changes
Make insufficient technological difficulties；Fracturing fluid of the present invention is using active water fracturing fluid+linear fracturing fluid combination technique, in maximum limit
Under conditions of degree reduces fracturing fluid to coal seam pollution, the prop-carrying capacity of fracturing fluid is improved, the leak-off of fracturing fluid is reduced, solves coal
Layer gas well short technological difficulties of easy sand plug, supporting crack radius in fracturing reform.
It is described above, any formal limitation not is made to the present invention, although the present invention is disclosed such as by embodiment
On, but the present invention is not limited to, any those skilled in the art are not departing from technical solution of the present invention scope
It is interior, when the technology contents using the disclosure above make a little change or are modified to the equivalent embodiment of equivalent variations, as long as being
Without departing from the content of technical solution of the present invention, what the technical spirit according to the present invention was made to above example any simply repaiies
Change, equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (9)
1. a kind of fracture technology suitable for high-dip structure coal seam, it is characterised in that comprise the following steps：
A, prepad fluid of the sand than 3%-9% is injected into coal bed gas well using pressure break pump truck；The prepad fluid includes prepad fluid branch
Agent and prepad fluid fracturing fluid are supportted, the prepad fluid proppant is the quartzy flour sand of 70-100 mesh, and the prepad fluid fracturing fluid is activity
Water fracturing fluid, wherein 70-100 mesh quartz flour sand weight ratio is 20%-30%；
B, load fluid of the sand than 8%-15% is injected into coal bed gas well using pressure break pump truck；The load fluid is divided into early stage and taken again
Sand liquid and later stage load fluid, the early stage load fluid include early stage load fluid proppant and early stage load fluid fracturing fluid, it is described after
Phase load fluid includes later stage load fluid proppant and later stage load fluid fracturing fluid；
The early stage load fluid proppant is 40-70 mesh low-density fine sands, and the early stage load fluid fracturing fluid is the active water
Fracturing fluid, wherein the 40-70 mesh low-density fine sand weight ratio is 30%-40%；
The later stage load fluid proppant is sand in 20-40 mesh quartz, and the later stage load fluid fracturing fluid splits including linear glue laminated
Liquid and biology enzyme low temperature gel breaker, wherein sand weight ratio is 40%-50% in 20-40 mesh quartz；
C, using pressure break pump truck displacement fluid is injected into coal bed gas well；The displacement fluid is the active water fracturing fluid.
2. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that above-mentioned steps
In A, the prepad fluid accounts for the 50%-60% for being pumped into total liquid measure.
3. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that above-mentioned steps
In A, the active water fracturing fluid includes clear water, expansion-resisting agent KCL (content is 1%-2%) and cleanup additive, and (content is 0.2%-
0.3%).
4. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that above-mentioned steps
In B, into coal bed gas well, injection load fluid is divided into following steps again：
(1) the early stage load fluid is injected, for supporting secondary crack；
(2) the later stage load fluid is injected, for supporting waterpower major fracture.
5. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that above-mentioned steps
In B, the linear fracturing fluid includes clear water, expansion-resisting agent KCL (content is 1%-2%), (content is 0.2%- to cleanup additive
0.3%) with hydroxypropyl guanidine that glue (content is 0.30%-0.35%), the viscosity of the linear fracturing fluid is 30cp-35cp,
Account for the 20%-25% for being pumped into total liquid measure.
6. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that above-mentioned steps
In B, the biology enzyme low temperature gel breaker concentration is 0.0005%-0.0006%.
7. the fracture technology suitable for high-dip structure coal seam according to claim 3 or 5, it is characterised in that described
Expansion-resisting agent KCL content is determined by the natural gamma value (GR) of coal seam well fracturing section：
If GR≤45API, KCL content are 1%；
If 45API ＜ GR≤60API, KCL contents are 1.5%；
If 60API ＜ GR, KCL content are 2%.
8. the fracture technology suitable for high-dip structure coal seam according to claim any one of 1-6, it is characterised in that
The discharge capacity of the fracturing pump is 6m3/min-8m3/min。
9. the fracture technology according to claim 1 suitable for high-dip structure coal seam, it is characterised in that every meter of coal seam
Thickness sand feeding amount is 9m3-10m3, plus fracturing fluid (active water fracturing fluid and linear fracturing fluid) amount is 200m3-250m3。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676072A (en) * | 2017-11-06 | 2018-02-09 | 北京九尊能源技术股份有限公司 | A kind of CBM Fracturing technique for being applied to high steep coal seam |
| CN108843292A (en) * | 2018-05-25 | 2018-11-20 | 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 super high seam fracturing yield increasing technique |
| 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 |
| 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 |
| CN113550717A (en) * | 2020-04-23 | 2021-10-26 | 尹祖龙 | Coal bed gas fracturing device and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676072A (en) * | 2017-11-06 | 2018-02-09 | 北京九尊能源技术股份有限公司 | A kind of CBM Fracturing technique for being applied to high steep coal seam |
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| 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 |
| CN113550717A (en) * | 2020-04-23 | 2021-10-26 | 尹祖龙 | Coal bed gas fracturing device and using method thereof |
| 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 |
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Application publication date: 20171024 |