CN110513084A - Coal bed gas region method for increasing - Google Patents
Coal bed gas region method for increasing Download PDFInfo
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- CN110513084A CN110513084A CN201910894890.8A CN201910894890A CN110513084A CN 110513084 A CN110513084 A CN 110513084A CN 201910894890 A CN201910894890 A CN 201910894890A CN 110513084 A CN110513084 A CN 110513084A
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- China
- Prior art keywords
- well
- shock wave
- horizontal well
- straight
- bed gas
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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
- 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
- E21B43/25—Methods 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The present invention relates to coal bed gas region method for increasing, to solve the problems, such as that coal bed gas straight well can not implement effective well stimulation in this well, while improving straight well yield in region.Coal bed gas region method for increasing, includes the following steps；Straight well existing in setting regions is divided into left and right two rows, and the operation scheme of controllable shock wave equipment is determined according to the physico-mechanical properties in horizontal well coal seam, parameter and tomography situation in the centerline horizontal well drilling of the two rows of straight wells in left and right；Horizontal well section of the linear distance of horizontal well and straight well less than 50 meters, operation intensity, operations number are twice compared with operation intensity that the horizontal well section is set in the operation scheme, operations number increasing；Controllable shock wave is equipped into feeding horizontal well and waits for operation coal seam section, operation coal seam section is treated according to the operation scheme of setting and implements shock wave operation；After completing shock wave operation, act controllable shock wave equipment；Horizontal well is put into mining；Adjust the mining scheme of straight well.
Description
Technical field
The invention belongs to energy extraction fields, and in particular to coal bed gas region method for increasing.
Background technique
Coal bed gas is a kind of high fever, cleaning, convenient new energy." the coal bed gas money of Ministry of Land and Resources's tissue in 2015
Source dynamic evaluation " shows that coal bed gas total resources is about 30,000,000,000,000 sides, and mining resources amount is about 12.5 trillion sides, in world coal seam
It is number three in gas stock number, accounts for about the 11.2%-13.7% of global resources reserves.
2018, rough estimates in the gas meter of China coal seam, ground narrow sense methane output was 54.63 billion cubic meters, coal mine
Underground gas extraction amount is 129 billion cubic meters, and coal bed gas total output is 183.6 billion cubic meters, and gas utilization amount is 10,100,000,000 vertical
Square rice, apart from Demand of Nation, there are also very big gaps.
About 18000 mouthfuls of coal bed gas straight well at present of China, after through a long time use, there are about three/second is that stripper well,
Even not gas-producing well；Due to foring sand column outside pit shaft, it is difficult to improve yield by doing work to coal seam again, if low at these
It produces and opens up straight well again between well, not gas-producing well, can not only expend vast resources, but also newly open straight well and still can after using
Stripper well is formed, the exploitation of coal bed gas has been seriously affected.
Summary of the invention
The purpose of the present invention is can not provide aiming at the problem that this well implements effective well stimulation coal bed gas straight well
Coal bed gas region method for increasing, to improve straight well yield in setting regions.
To achieve the above object, the technical solution of the invention is as follows:
A kind of coal bed gas region method for increasing, is characterized in that, includes the following steps；
Coal bed gas straight well existing in setting regions is pressed the position of its distribution by S1, and it is two rows of to be divided into left and right；
S2, in left and right, horizontal well borehole track is arranged in the center line of two rows of straight wells；
S3, according to the pithead position of the position distribution of straight well and horizontal well borehole track setting horizontal well straight well section；
S4 passes through the pithead position and the borehole track horizontal well drilling；
S5 determines the operator of controllable shock wave equipment according to the physico-mechanical properties in horizontal well coal seam, parameter and tomography situation
Case；The operation scheme includes: the number of shocks of operation intensity, job position and each position；
Horizontal well section of the linear distance of S6, horizontal well and straight well less than 50 meters, operation intensity, operations number are compared with the level
Operation intensity that wellblock section is set in step s 5, operations number increasing are twice；
S7, controllable shock wave equipment feeding horizontal well is most deep to operation coal seam section, it is set according to step S5 and step S6
Operation scheme treat operation coal seam section implement shock wave operation；
S8 implements shock wave operation to operation coal seam section to residue in a manner of returning on successively；
S9 after the shock wave operation for completing all coal seam sections, acts controllable shock wave equipment；
Horizontal well is put into mining by S10；
S11 adjusts the mining scheme of straight well in straight well arrangement area in time.
Preferably, the small 120MPa of shock wave peak pressure that the controllable shock wave equipment generates.
The invention has the benefit that
1. coal bed gas region provided by the invention method for increasing, by arranging that the two rows in area's setting regions are straight in coal bed gas straight well
Well center line arranges horizontal well, can effectively be released the coal bed gas in straight well distal end coal seam, and then improves yield；Simultaneously
Increase twice shock wave operation implementing intensity away from the horizontal well section within the scope of 50 meters of straight well, it is anti-reflection straight with opposition
The remote well area of well, effectively relieves the tamper of straight well periphery coal seam seepage channel, improves desorption, the seepage flow energy in straight well coal seam
Power, inhibits the adsorption capacity again in coal seam, and then improves coal bed gas well yield and production capacity.
2. the horizontal well that the present invention uses combines method for increasing with straight well, yield can be both obtained from horizontal well, it can also
To improve the straight well yield of corresponding region, forming region volume increase.This method has given up the technology road for directly implementing volume increase to straight well
Line, while avoiding and opening up the wasting of resources of straight well bring again between straight well and still will form stripper well, do not produce gas
The problem of well, the present invention are good for coal bed gas region effect of increasing production, and improvement cost is low, are widely portable to coal bed gas straight well arrangement
The volume increase in area.
Detailed description of the invention
Fig. 1 is the layout drawing of coal bed gas horizontal well；
Fig. 2 is the waveform diagram of controllable shock wave equipment；
Fig. 3 is the sectional view that horizontal well implements shock wave operation；
Fig. 4 is the flow chart of coal bed gas region of the present invention method for increasing.
Appended drawing reference is as follows:
The coal seam 1-, 2- screen casing, 3- straight well position, 4- horizontal well, 5- mud, the controllable shock wave equipment of 6-, 8- wellhead assembly.
Specific embodiment
The contents of the present invention are described in further detail below in conjunction with the drawings and specific embodiments:
The coal bed gas region method for increasing, as shown in Figures 1 to 4, comprising the following steps:
Coal bed gas straight well existing in setting regions is pressed the position of its distribution by S1, and it is two rows of to be divided into left and right；
The distribution of straight well position 3 of the coal bed gas straight well arrangement existing coal bed gas straight well in area is as shown in Figure 1, setting first needs to carry out
The straight well of region volume increase need to carry out the straight well of region volume increase for the straight well in black surround in Fig. 1, by the position distribution of straight well in black surround
It is divided into left and right two rows, the two rows of straight wells in the left and right separated are located at the straight well of 4 left and right sides of horizontal well.
The size and range in the region can determine the water of horizontal well in order to arrange subject to the two rows of horizontal wells in left and right
The straight well yield in the region, forming region volume increase are improved by horizontal well in the position of flat section.
S2, in left and right, borehole track is arranged in the center line of two rows of straight wells；
Center line is located at the two rows of straight wells in left and right and is formed in the median plane of plane, according to 1 physico-mechanical properties of coal seam, parameter and tomography
Situation determines position of the center line in the median plane, and then determines 4 borehole track of horizontal well.
S3, according to the pithead position of the position distribution of straight well and borehole track setting horizontal well straight well section.
S4 passes through the pithead position and the borehole track horizontal well drilling 4；
The drilling plan of horizontal well 4 is determined by 4 pithead position of horizontal well and 4 borehole track of horizontal well, and successively carries out straight well
Section construction, lower curved section construction, horizontal segment construction, during drilling well, reinforce the borehole wall using mud 5；Cheng Jinghou, under
Enter screen casing 2 to support 4 borehole wall of horizontal well.
S5 determines controllable shock wave equipment 6 according to the physico-mechanical properties in 4 coal seam 1 of horizontal well, parameter and tomography situation
Operation scheme；The operation scheme includes: the number of shocks of operation intensity, job position and each position；
The shock wave waveform diagram that the controllable shock wave equipment 6 of the present embodiment is exported is as shown in Figure 2.It is less than using surge pressure
The controllable shock wave of 120MPa.
The horizontal well 4 of two rows of straight well center line settings, can effectively be released the coal bed gas in straight well distal end coal seam 1
It puts, and then improves yield.
S6, horizontal well section of the linear distance less than 50 meters of horizontal well 4 and straight well, operation intensity, operations number compared with
Operation intensity that the horizontal well section is set in step s 5, operations number increasing are twice；
Increase twice shock wave operation implementing intensity away from the horizontal well section within the scope of 50 meters of straight well, is increased with opposition
The saturating remote well area of straight well, can release the tamper of 1 seepage channel of straight well periphery coal seam, effectively to improve the solution in straight well coal seam 1
It inhales, percolation ability, inhibits the adsorption capacity again in coal seam 1.
S7 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 4 horizontal segment of coal bed gas horizontal well, and rushing controllable shock wave equipment 6
It hits wave output window and is directed at most deep setting, controllable shock wave equipment 6 is located in screen casing 2 at this time.
S8 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.
S9,6 feeding horizontal well 4 of controllable shock wave equipment is most deep to operation coal seam section, according to step S5 and step
The operation scheme of S6 setting treats operation coal seam section and implements shock wave operation；
The operation scheme that controllable shock wave equipment 6 is set by step S5 and step S6 implements shock wave to setting in screen casing 2
Operation；
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 created
New crack is made, coal seam 1 and pit shaft are linked up；Shock wave 13 loses portion of energy, dump energy is only when releasing the blocking of mud 5
Coal seam 1 is served it is anti-reflection, the problems such as being not enough to injure coal seam 1, collapse hole will not occur.
S10 carries out shock wave operation to remaining coal seam section to be rebuilt in a manner of returning on successively；
After the shock wave operation for completing upper coal seam section, controllable shock wave is above mentioned by oil pipe and equips 6 underground tool strings, making can
It controls shock wave equipment 6 and is located at adjacent coal seam section to be rebuilt, and carry out shock wave operation.
S11 after the shock wave operation for completing all coal seam sections, 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 works
Tool string, dismantles wellhead assembly 8, and successively remove each tool, puts the tools away.
S12 descends the complete well of flow string as required, and horizontal well 4 is put into mining.
S13 adjusts the mining scheme of straight well in straight well arrangement area in time；
With the anti-reflection remote well area of straight well of opposition in horizontal well 4,1 seepage channel of straight well periphery coal seam is effectively relieved
Tamper so that straight well yield and production capacity improve, staff adjusts the mining scheme of straight well in time to adapt to new production gas
Amount.
Horizontal well 4 forms new crack after shock wave operation, and stitches net with cracking initiation of the straight well after anti-reflection, thus real
Region combination volume increase is applied, this method both can obtain yield from horizontal well 4, and can also be improved the straight well yield of corresponding region,
The present invention is good for coal bed gas region effect of increasing production, and improvement cost is low, is widely portable to the volume increase in coal bed gas straight well arrangement area.
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 (2)
1. a kind of coal bed gas region method for increasing, which comprises the following steps:
Coal bed gas straight well existing in setting regions is pressed the position of its distribution by S1, and it is two rows of to be divided into left and right；
S2, in left and right, horizontal well (4) borehole track is arranged in the center line of two rows of straight wells；
S3, according to the pithead position of the position distribution of straight well and horizontal well (4) borehole track setting horizontal well straight well section；
S4 passes through the pithead position and the borehole track horizontal well drilling (4)；
S5 determines controllable shock wave equipment according to the physico-mechanical properties in horizontal well (4) coal seam (1), parameter and tomography situation
(6) operation scheme；The operation scheme includes: the number of shocks of operation intensity, job position and each position；
S6, horizontal well section of the linear distance less than 50 meters of horizontal well (4) and straight well, operation intensity, operations number relatively should
Operation intensity that horizontal well section is set in step s 5, operations number increasing are twice；
S7, controllable shock wave equipment (6) feeding horizontal well (4) is most deep to operation coal seam section, according to step S5 and step
The operation scheme of S6 setting treats operation coal seam section and implements shock wave operation；
S8 implements shock wave operation to operation coal seam section to residue in a manner of returning on successively；
S9 after the shock wave operation for completing all coal seam sections, acts controllable shock wave equipment (6)；
Horizontal well (4) are put into mining by S10；
S11 adjusts the mining scheme of straight well in straight well arrangement area in time.
2. coal bed gas region according to claim 1 method for increasing, it is characterised in that: the controllable shock wave equipment (6)
The small 120MPa of the shock wave peak pressure of generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894890.8A CN110513084A (en) | 2019-09-20 | 2019-09-20 | Coal bed gas region method for increasing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894890.8A CN110513084A (en) | 2019-09-20 | 2019-09-20 | Coal bed gas region method for increasing |
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| Publication Number | Publication Date |
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| CN110513084A true CN110513084A (en) | 2019-11-29 |
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| CN201910894890.8A Pending CN110513084A (en) | 2019-09-20 | 2019-09-20 | Coal bed gas region method for increasing |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10364659B1 (en) * | 2018-09-27 | 2019-07-30 | Exxonmobil Upstream Research Company | Methods and devices for restimulating a well completion |
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2019
- 2019-09-20 CN CN201910894890.8A patent/CN110513084A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10364659B1 (en) * | 2018-09-27 | 2019-07-30 | Exxonmobil Upstream Research Company | Methods and devices for restimulating a well completion |
Non-Patent Citations (2)
| Title |
|---|
| 张永民等: "松软煤层可控冲击波增透瓦斯抽采创新实践—以贵州水城矿区中井煤矿为例", 《煤炭学报》 * |
| 朱庆忠等: "郑庄区块高阶煤层气低效产能区耦合盘活技术", 《煤炭学报》 * |
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Application publication date: 20191129 |
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