CN110439525A - Coal bed gas horizontal well de-plugging, anti-reflection completion method - Google Patents
Coal bed gas horizontal well de-plugging, anti-reflection completion method Download PDFInfo
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- CN110439525A CN110439525A CN201910811069.5A CN201910811069A CN110439525A CN 110439525 A CN110439525 A CN 110439525A CN 201910811069 A CN201910811069 A CN 201910811069A CN 110439525 A CN110439525 A CN 110439525A
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- China
- Prior art keywords
- shock wave
- reflection
- coal seam
- bed gas
- plugging
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Classifications
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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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
-
- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars
-
- 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
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The present invention relates to coal bed gas horizontal well de-pluggings, anti-reflection completion method, and when in a manner of solving using mud drilling, mud can block hole wall, so that the problem that the coal bed gas in coal seam can not cause production efficiency low across mud.The coal bed gas horizontal well de-plugging, anti-reflection completion method are the following steps are included: drilling well, Cheng Jinghou tripping in screen casing；The horizontal segment of coal bed gas horizontal well is divided into several de-pluggings, anti-reflection coal seam section；Determine the operation scheme of controllable shock wave equipment；Controllable shock wave equipment is sent into coal seam section to be rebuilt, is filled the water into coal bed gas well；De-plugging, anti-reflection operation are implemented to setting by controllable shock wave equipment；The operations number of controllable shock wave equipment is monitored by monitoring probe；After coal seam section completes de-plugging, anti-reflection operation, shock wave operation is carried out to next coal seam section to be rebuilt in a manner of returning on successively；After completing the de-pluggings of all coal seam sections, anti-reflection operation, act controllable shock wave equipment.
Description
Technical field
The invention belongs to energy extraction fields, and in particular to coal bed gas horizontal well de-plugging, anti-reflection completion method.
Background technique
Coal bed gas (gas) disaster that coal generates is China's coal-mine injures and deaths, the largest loss and occurs most frequent great
Serious accident seriously threatens the safety in production of mine.Coal bed gas still causes greenhouse effects, destroys the atmospheric environments such as ozone layer
The source of pollution, greenhouse effects are 20~24 times of isometric carbon dioxide, and the damage capability to atmospheric ozone layer is titanium dioxide
7 times of carbon.
" 13 " planning publication 3 years, although coal gas industry is persistently struggled, because of the influence of many factors, in fact
Border development is far below expection, and still, the resource exploitation potentiality of coal bed gas are still huge.It is 2018, preliminary in the gas meter of China coal seam
Statistics, ground narrow sense methane output are 54.63 billion cubic meters, and coal mine gas extraction amount is 129 billion cubic meters, coal bed gas
Total output is 183.6 billion cubic meters, and gas utilization amount is 101 billion cubic meters, and apart from Demand of Nation, there are also very big gaps.
The main problem that the coal gas industry of China's horizontal well cannot quickly and effectively develop for a long time are as follows: first is that a large amount of use
Take hydraulic fracturing as the straight well of main completion method, at present about 18000 mouthfuls of coal bed gas straight well, about three points this second is that
Stripper well, even not gas-producing well；Second is that coalbed methane reservoir is in the majority with weak seam, using after wash boring in soft coal seam
The problem of being easy to appear collapse hole affects the forming of well；Hole wall can be supported using when mud drilling by mud, ensure that well
Forming, but mud can block hole wall simultaneously, and the coal bed gas in coal seam can not pass through the problem that mud causes production efficiency low.
Summary of the invention
The object of the present invention is to provide coal bed gas horizontal well de-pluggings, anti-reflection completion method, to solve using mud drilling
When mode, mud can block hole wall, so that the problem that the coal bed gas in coal seam can not cause production efficiency low across mud.
To achieve the above object, the technical solution of the invention is as follows:
Coal bed gas horizontal well de-plugging, anti-reflection completion method, are characterized in that, include the following steps；
S1, drilling well, and cemented the well using mud；
S2, Cheng Jinghou, tripping in screen casing；
S3 equips the EFFECTIVE RANGE in target coal seam according to controllable shock wave, by the horizontal segment of coal bed gas horizontal well point
For several de-pluggings, anti-reflection coal seam section；
S4 determines controllable shock wave equipment de-plugging, antireflective operation according to coal seam physico-mechanical properties, parameter and tomography situation
Scheme；
Controllable shock wave is equipped with oil pipe and is sent into the most deep coal seam section to be rebuilt of coal bed gas horizontal well, and will controllably rushed by S5
The shock wave output window for hitting wave equipment is directed at most deep setting, and controllable shock wave equipment is located in screen casing at this time；
S6, the water filling into coal bed gas well is until pit shaft liquid-column height reaches 100 meters；
S7, in well head to oil pipe water pressure generation, after hydraulic pressure is higher than given threshold, controllable shock wave equipment exists by the operation scheme
De-plugging, anti-reflection operation are implemented to setting in screen casing；
S8 monitors the operations number of controllable shock wave equipment by the monitoring probe being arranged on well head oil tube wall；
S9, after the monitoring probe monitors that coal seam section completes de-plugging, anti-reflection operation, to next in a manner of being returned on successively
A coal seam section to be rebuilt carries out shock wave operation；
S10 after completing the de-pluggings of all coal seam sections, anti-reflection operation, acts controllable shock wave equipment.
Preferably, horizontal segment is divided into several solutions by the EFFECTIVE RANGE according to controllable shock wave in target coal seam
Stifled, anti-reflection section, each section avoid 10 meters of tomography present position or more, and each de-plugging, anti-reflection Section center position are one
Setting.
Preferably, the shock wave peak pressure that the controllable shock wave equipment generates is less than 80MPa.
The invention has the benefit that
1. the prior art uses mud after mud drilling that can block hole wall, screen casing is entered well first and led to by technical solution of the present invention
It crosses screen casing to support the borehole wall, repeat impact is carried out to coal seam in screen casing using controllable shock wave equipment, shock wave is first released from
Then ponding of the drilling mud to the borehole wall carries out coal seam anti-reflection；During this, support due to screen casing to the borehole wall,
Shock wave can create new crack in coal seam, release ponding of the drilling mud to coal seam, link up coal seam and pit shaft, impact
Wave can be applied to coal seam depth, improve desorption, the percolation ability in coal seam, inhibit the adsorption capacity again in coal seam, and then improve coal
Layer gas well yield and production capacity.
2. controllable shock wave equipment used in the present invention, with the shock wave of intensity controlled in coal seam, the impact of load
Wave loses most of energy when releasing mud blocking, and the shock wave for carrying a small amount of energy only plays anti-reflection, deficiency to coal seam
To injure coal seam, the problem of collapse hole will not occur, solve the problems, such as that weak seam can not drilling well.
3. avoiding using the controllable shock wave of sphere of action and carrying out fragment-force bring to horizontal segment using packer
It is inconvenient.
Detailed description of the invention
Fig. 1 is the sectional view constructed using coal bed gas horizontal well de-plugging of the present invention, anti-reflection completion method；
Fig. 2 is the structure chart of screen casing；
Fig. 3 is the right view of Fig. 2；
Fig. 4 is the waveform diagram of controllable shock wave equipment；
Fig. 5 is coal bed gas horizontal well de-plugging of the present invention, anti-reflection completion method flow chart.
Appended drawing reference is as follows:
The coal seam 1-, 2- screen casing, 3- circular hole, 4- strip hole, 5- mud, the controllable shock wave equipment of 6-, 7- wellhead assembly, 9- shock wave
Waveform.
Specific embodiment
The contents of the present invention are described in further detail below in conjunction with the drawings and specific embodiments:
As shown in Figures 1 to 5, the coal bed gas horizontal well de-plugging, anti-reflection completion method, comprising the following steps:
S1, drilling well, and cemented the well using mud；
During drilling well, to guarantee wellbore stability and Cheng Jing, the borehole wall can be reinforced using mud.
S2, Cheng Jinghou, tripping in screen casing 2；
By 2 tripping in horizontal well of screen casing, and screen casing 2 is fixed in well to support the borehole wall；
The screen casing 2 of tripping in also may be selected to be casing, and perforation can play the role of same as screen casing 2 on the casing of tripping in.
S3, according to EFFECTIVE RANGE of the controllable shock wave equipment 6 in target coal seam 1, by the water of coal bed gas horizontal well
Flat section is divided into several de-pluggings, anti-reflection coal seam section；Each section is 10 meters ~ 20 meters, and each section avoids tomography present position
10 meters or more, each Section center position is a setting.Coal bed gas horizontal well de-plugging of the invention, anti-reflection completion method are logical
EFFECTIVE RANGE is crossed to divide section, and then the operation scheme that controllable shock wave equips 6 pairs of each sections is set, this method is kept away
Exempt to need packer segmentation bring inconvenient using hydraulic fracturing etc., has further improved de-plugging, antireflective efficiency.
S4 determines that controllable shock wave equips 6 de-pluggings, anti-reflection according to 1 physico-mechanical properties of coal seam, parameter and tomography situation
Operation scheme；
The shock wave waveform diagram that the controllable shock wave equipment 6 of the present embodiment is exported is as shown in Figure 3.It is less than using surge pressure
80Mpa, pulsewidth are less than 50 μ s, 20 meters of limited action distance of controllable shock wave.
S5 checks whether coal bed gas well casing is clear and coherent using gauguste cutter；After inspection meets the requirements, will controllably it be impacted with oil pipe
Wave equipment 6 is pushed to the most deep coal seam section to be rebuilt of coal bed gas horizontal well horizontal segment, and controllable shock wave is equipped to 6 impact
Wave output window is directed at most deep setting, and controllable shock wave equipment 6 is located in screen casing 2 at this time.
S6 is pressed after being installed in place wellhead assembly 8, oil pipe and its control pipeline, and to its each component, each coupling part
Its rated operating pressure carries out pressure testing, it is ensured that wellhead assembly 8, oil pipe can work normally.
S7, the water filling into coal bed gas well is until pit shaft liquid-column height reaches 100 meters；
Controllable shock wave equipment 6 needs water as medium, and the salinity of mine water is higher, and the surface water different from water quality meets
The chemical reaction that water complexity can be produced afterwards, leads to undesirable consequence, to avoid this problem present invention from being produced using this well or offset well
Water, be injected into pit shaft, before operation to eliminate adverse reaction caused by different quality.
It is filled the water before operation until 100 meters of pit shaft liquid-column height arrival, the water being always maintained in operation process in pit shaft
Liquid level is at 100 meters of pit shaft liquid-column height.
S8, in well head to oil pipe water pressure generation, after hydraulic pressure is higher than given threshold, controllable shock wave equipment 6 presses the operation
Scheme implements de-plugging, anti-reflection operation to setting in screen casing 2；
De-plugging and anti-reflection operation are carried out to coal seam according to the controllable shock wave waveform of step S4 setting；
Controllable shock wave equipment 6 is located in screen casing 2, and 13 output window of shock wave is directed at most deep setting, and shock wave 13 is first
Ponding of the drilling mud to the borehole wall is first released, and creates new crack, links up coal seam and pit shaft；Shock wave 13 is desilted in solution
When slurry blocking, portion of energy is lost, dump energy only plays coal seam 1 anti-reflection, is not enough to injure coal seam 1, will not occur
The problem of collapse hole, solve the problems, such as weak seam 1 can not drilling well the problem of and coal seam it is anti-reflection.
S9 monitors the operations number of controllable shock wave equipment 6 by the monitoring probe being arranged on well head oil tube wall；
Monitoring probe is provided on the tubing wall of well head, monitoring probe can monitor the operations number of controllable shock wave equipment 6, in turn
Whether monitoring is just completed de-plugging, anti-reflection operation in the coal seam section of operation.
S10, after the monitoring probe monitors that coal seam section completes de-plugging, anti-reflection operation, in a manner of being returned on successively
Shock wave operation is carried out to next coal seam section to be rebuilt；
After the shock wave operation for completing a upper coal seam section, controllable shock wave is above mentioned by oil pipe and equips 6 underground tool strings, make controllable
Shock wave equipment 6 is located at adjacent coal seam section to be rebuilt, and carries out shock wave operation；
By it is same successively on return in a manner of shock wave operation is implemented to remaining coal seam section to be rebuilt.
S11 after completing the de-pluggings of all coal seam sections, anti-reflection operation, acts controllable shock wave equipment 6；
By it is same successively on return in a manner of complete the operation of all coal seam sections after, act controllable shock wave and equip 6 underground tool strings,
Wellhead assembly 8 is dismantled, and successively removes each tool, is put the tools away.
S12 descends the complete well of flow string as required, puts into mining；
The pump in coal bed gas well, water pipe and the bar that draws water are re-assemblied, according to the analysis before operation to 1 physical parameter of coal seam, by setting
Determine the technique investment mining of mining.
The above description is only an embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, all to utilize the present invention
Equivalent structure transformation made by specification and accompanying drawing content, is applied directly or indirectly in other relevant technical fields, and wraps
It includes in scope of patent protection of the invention.
Claims (3)
1. coal bed gas horizontal well de-plugging, anti-reflection completion method, it is characterised in that: include the following steps；
S1, drilling well, and cemented the well using mud；
S2, Cheng Jinghou, tripping in screen casing (2)；
The horizontal segment of coal bed gas horizontal well is divided into several de-pluggings, anti-reflection coal seam section by S3；
S4 determines controllable shock wave equipment (6) de-plugging, anti-reflection according to coal seam (1) physico-mechanical properties, parameter and tomography situation
Operation scheme；
Controllable shock wave is equipped (6) with oil pipe and is sent into the most deep coal seam section to be rebuilt of coal bed gas horizontal well by S5, and will be controllable
The shock wave output window that shock wave equips (6) is directed at most deep setting, and controllable shock wave equipment (6) is located at screen casing at this time
(2) in；
S6, the water filling into coal bed gas well is until pit shaft liquid-column height reaches 100 meters；
S7 after hydraulic pressure is higher than given threshold, presses the work by controllable shock wave equipment (6) in well head to oil pipe water pressure generation
Industry scheme implements de-plugging, anti-reflection operation to setting in screen casing (2)；
S8 monitors the operations number of controllable shock wave equipment (6) by the monitoring probe being arranged on well head oil tube wall；
S9, after the monitoring probe monitors that coal seam section completes de-plugging, anti-reflection operation, to next in a manner of being returned on successively
A coal seam section to be rebuilt carries out shock wave operation；
S10 after completing the de-pluggings of all coal seam sections, anti-reflection operation, acts controllable shock wave equipment (6).
2. coal bed gas horizontal well de-plugging according to claim 1, anti-reflection completion method, it is characterised in that: according to controllable punching
It hits EFFECTIVE RANGE of the wave in target coal seam (1) and horizontal segment is divided into several de-pluggings, anti-reflection section, each section is avoided
10 meters of tomography present position or more, each de-plugging, anti-reflection Section center position are a setting.
3. coal bed gas horizontal well de-plugging according to claim 2, anti-reflection completion method, it is characterised in that: the controllable punching
It hits the shock wave peak pressure that wave equipment (6) generates and is less than 80MPa.
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| CN201910811069.5A CN110439525A (en) | 2019-08-30 | 2019-08-30 | Coal bed gas horizontal well de-plugging, anti-reflection completion method |
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| CN201910811069.5A CN110439525A (en) | 2019-08-30 | 2019-08-30 | Coal bed gas horizontal well de-plugging, anti-reflection completion method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681997A (en) * | 2020-12-28 | 2021-04-20 | 中国石油集团渤海钻探工程有限公司 | Method for tripping underground drilling tool by using controllable shock wave and device for measuring tripping energy of controllable shock wave |
| CN114458209A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Horizontal well screen pipe detection blockage removal system and method |
| CN115387771A (en) * | 2022-08-10 | 2022-11-25 | 中煤科工集团西安研究院有限公司 | Underground coal mine staged hydraulic fracturing tool string with rapid plug removal function and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155253A (en) * | 2011-01-26 | 2011-08-17 | 吕晓琳 | Ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves |
| US20140305877A1 (en) * | 2013-04-11 | 2014-10-16 | Sanuwave, Inc. | Apparatuses and methods for generating shock waves for use in the energy industry |
| CN104481574A (en) * | 2014-09-29 | 2015-04-01 | 中国矿业大学(北京) | Method for improving coal seam gas permeability through high energy acoustoelectric composite technology |
| CN107956505A (en) * | 2017-10-18 | 2018-04-24 | 西安交通大学 | Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology |
| CN107989586A (en) * | 2017-10-18 | 2018-05-04 | 西安交通大学 | Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave |
| CN110107263A (en) * | 2019-06-20 | 2019-08-09 | 中联煤层气有限责任公司 | A kind of method of deformed coal exploiting coal bed methane |
-
2019
- 2019-08-30 CN CN201910811069.5A patent/CN110439525A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155253A (en) * | 2011-01-26 | 2011-08-17 | 吕晓琳 | Ground pumping and mining coal seam gas well reformation method based on recurrence frequency impact waves |
| US20140305877A1 (en) * | 2013-04-11 | 2014-10-16 | Sanuwave, Inc. | Apparatuses and methods for generating shock waves for use in the energy industry |
| CN104481574A (en) * | 2014-09-29 | 2015-04-01 | 中国矿业大学(北京) | Method for improving coal seam gas permeability through high energy acoustoelectric composite technology |
| CN107956505A (en) * | 2017-10-18 | 2018-04-24 | 西安交通大学 | Coal mine down-hole drilling anti-reflection method based on controllable shock wave technology |
| CN107989586A (en) * | 2017-10-18 | 2018-05-04 | 西安交通大学 | Coal bed gas well remodeling method based on the compound surge formula pressurized water injection of controllable shock wave |
| CN110107263A (en) * | 2019-06-20 | 2019-08-09 | 中联煤层气有限责任公司 | A kind of method of deformed coal exploiting coal bed methane |
Non-Patent Citations (3)
| Title |
|---|
| 张永民等: "电脉冲可控冲击波煤储层增透原理与工程实践", 《煤炭科学技术》 * |
| 方志雄等: "《延川南煤层气田勘探开发关键技术及应用》", 30 June 2017, 地质出版社 * |
| 邱爱慈: "《脉冲功率技术应用》", 31 December 2016 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114458209A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Horizontal well screen pipe detection blockage removal system and method |
| CN114458209B (en) * | 2020-10-21 | 2024-03-22 | 中国石油化工股份有限公司 | Horizontal well screen pipe detection blocking removal system and method |
| CN112681997A (en) * | 2020-12-28 | 2021-04-20 | 中国石油集团渤海钻探工程有限公司 | Method for tripping underground drilling tool by using controllable shock wave and device for measuring tripping energy of controllable shock wave |
| CN115387771A (en) * | 2022-08-10 | 2022-11-25 | 中煤科工集团西安研究院有限公司 | Underground coal mine staged hydraulic fracturing tool string with rapid plug removal function and method |
| CN115387771B (en) * | 2022-08-10 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Coal mine underground segmented hydraulic fracturing tool string with rapid blocking removal function and method |
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Application publication date: 20191112 |
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