CN108843294A - A kind of fracturing process for coal-bed gas exploitation - Google Patents
A kind of fracturing process for coal-bed gas exploitation Download PDFInfo
- Publication number
- CN108843294A CN108843294A CN201810549566.8A CN201810549566A CN108843294A CN 108843294 A CN108843294 A CN 108843294A CN 201810549566 A CN201810549566 A CN 201810549566A CN 108843294 A CN108843294 A CN 108843294A
- Authority
- CN
- China
- Prior art keywords
- bed gas
- coal
- coal bed
- gas well
- well
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 58
- 239000003245 coal Substances 0.000 claims abstract description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 230000011218 segmentation Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000000284 extract Substances 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2405—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection in association with fracturing or crevice forming processes
-
- 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
Landscapes
- 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)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a kind of fracturing process for coal-bed gas exploitation, include the following steps：Step（1）：Hydraulic fracturing is carried out to coal bed gas well, extracts the remaining fracturing fluid in coal bed gas well after pressure break out；Step（2）：Segmentation liquid nitrogen frac treatment is carried out to coal bed gas well；Step（3）：After the completion of pressure break, segmentation hot nitrogen frac treatment is carried out to coal bed gas well, coal bed gas well is closed, carries out bored well operation.Fracturing process of the invention is good to the fracturing effect of coal bed gas well.
Description
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies fields, and in particular to a kind of fracturing process for coal-bed gas exploitation.
Background technique
Coal bed gas is commonly called as " gas ", it, which refers to, is stored in coal seam using methane as main component, to be adsorbed on matrix of coal
Based on grain surface, the hydrocarbon gas that is partially free in coal hole or is dissolved in coal seam water, be the associated minerals resource of coal, belong to
Unconventional gas.Since coal bed gas is mainly present in coal seam with adsorbed state, coal bed gas takes off from coal seam under natural conditions
Attached speed is slower, and the coal bed gas collected is all the gas of free desorption, is influenced by the desorption rate of coal bed gas, practical raw
The yield of coal bed gas is not high in production.Before coal-bed gas exploitation, frac treatment first is carried out to coal bed gas well and is beneficial to coal bed gas
Exploitation.Can the frac treatment that high quality be provided determine the production efficiency of coal bed gas.
Summary of the invention
The purpose of the present invention is to provide a kind of fracturing process for coal-bed gas exploitation, to the fracturing effect of coal bed gas well
It is good.
To achieve the above object, the present invention provides the following technical solutions：
A kind of fracturing process for coal-bed gas exploitation, includes the following steps：
Step（1）：Hydraulic fracturing is carried out to coal bed gas well, extracts the remaining fracturing fluid in coal bed gas well after pressure break out；
Step（2）：Segmentation liquid nitrogen frac treatment is carried out to coal bed gas well；
Step（3）：After the completion of pressure break, segmentation hot nitrogen frac treatment is carried out to coal bed gas well, coal bed gas well is closed, carries out bored well
Operation.
Preferably, the step（3）Middle closed time is -48 hours 24 hours.
Preferably, the step（3）In carry out segmentation hot nitrogen frac treatment used in hot nitrogen temperature be 40 DEG C -60
℃。
Preferably, the step（3）When the bored well of middle coal bed gas well, the air pressure in coal bed gas well is higher than normal atmospheric pressure.
The beneficial effects of the invention are as follows：The coal bed gas borehole wall is first handled with hydraulic fracturing, the borehole wall is made to generate pressure break gap, then
Carried out using liquid nitrogen quick-frozen, rapid freezing will make borehole wall freezing and expansion, and borehole wall internal stress generates crack.Then hot nitrogen is used
Segmentation defrosting is carried out to the borehole wall section of pressure break, so that crack is got through.What is used due to pressure break and bored well is all that nitrogen does not have
Other gases are mixed into coal bed gas well, facilitate recycling, and the separation costs of another nitrogen are low, are conducive to industrial production and are used, use
It is at low cost.The practical three kinds of different pressure break means of the present invention carry out frac treatment to coal bed gas well, and the advantage of three kinds of modes can be most
Bigization plays, and coal bed gas well fracturing effect is good.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, With reference to embodiment to of the present invention
Technical solution is described further, but the present invention is not limited only to this.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of fracturing process for coal-bed gas exploitation, includes the following steps：
Step（1）：Hydraulic fracturing is carried out to coal bed gas well, extracts the remaining fracturing fluid in coal bed gas well after pressure break out；
Step（2）：Segmentation liquid nitrogen frac treatment is carried out to coal bed gas well；
Step（3）：After the completion of pressure break, segmentation hot nitrogen frac treatment is carried out to coal bed gas well, coal bed gas well is closed, carries out bored well
Operation.
Preferably, the step（3）Middle closed time is -48 hours 24 hours.
Preferably, the step（3）In carry out segmentation hot nitrogen frac treatment used in hot nitrogen temperature be 40 DEG C -60
℃。
Preferably, the step（3）When the bored well of middle coal bed gas well, the air pressure in coal bed gas well is higher than normal atmospheric pressure.
Claims (4)
1. a kind of fracturing process for coal-bed gas exploitation, which is characterized in that include the following steps：
Step（1）：Hydraulic fracturing is carried out to coal bed gas well, extracts the remaining fracturing fluid in coal bed gas well after pressure break out；
Step（2）：Segmentation liquid nitrogen frac treatment is carried out to coal bed gas well；
Step（3）：After the completion of pressure break, segmentation hot nitrogen frac treatment is carried out to coal bed gas well, coal bed gas well is closed, carries out bored well
Operation.
2. a kind of fracturing process for coal-bed gas exploitation according to claim 1, which is characterized in that the step（3）
Middle closed time is -48 hours 24 hours.
3. a kind of fracturing process for coal-bed gas exploitation according to claim 1, which is characterized in that the step（3）
In carry out segmentation hot nitrogen frac treatment used in hot nitrogen temperature be 40 DEG C -60 DEG C.
4. a kind of fracturing process for coal-bed gas exploitation according to claim 1, which is characterized in that the step（3）
When the bored well of middle coal bed gas well, the air pressure in coal bed gas well is higher than normal atmospheric pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810549566.8A CN108843294A (en) | 2018-05-31 | 2018-05-31 | A kind of fracturing process for coal-bed gas exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810549566.8A CN108843294A (en) | 2018-05-31 | 2018-05-31 | A kind of fracturing process for coal-bed gas exploitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108843294A true CN108843294A (en) | 2018-11-20 |
Family
ID=64210254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810549566.8A Withdrawn CN108843294A (en) | 2018-05-31 | 2018-05-31 | A kind of fracturing process for coal-bed gas exploitation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108843294A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324393A (en) * | 2020-10-23 | 2021-02-05 | 中联煤层气国家工程研究中心有限责任公司 | Method for exploiting coal bed gas |
| CN113445980A (en) * | 2021-07-08 | 2021-09-28 | 徐州工程学院 | Method for enhancing anti-reflection effect of hydraulic fracturing of ground drilling |
| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
| CN114607337A (en) * | 2022-03-09 | 2022-06-10 | 中国石油大学(北京) | Liquid nitrogen-water composite fracturing method for coal-bed gas well |
-
2018
- 2018-05-31 CN CN201810549566.8A patent/CN108843294A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324393A (en) * | 2020-10-23 | 2021-02-05 | 中联煤层气国家工程研究中心有限责任公司 | Method for exploiting coal bed gas |
| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
| CN113586022B (en) * | 2021-06-04 | 2023-06-27 | 广州海洋地质调查局 | Method and device for improving yield of natural gas hydrate reservoir through freezing fracturing |
| CN113445980A (en) * | 2021-07-08 | 2021-09-28 | 徐州工程学院 | Method for enhancing anti-reflection effect of hydraulic fracturing of ground drilling |
| CN114607337A (en) * | 2022-03-09 | 2022-06-10 | 中国石油大学(北京) | Liquid nitrogen-water composite fracturing method for coal-bed gas well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181120 |
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| WW01 | Invention patent application withdrawn after publication |