CN110306965A - A kind of method for increasing for coal bed gas low yield wellblock - Google Patents
A kind of method for increasing for coal bed gas low yield wellblock Download PDFInfo
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- 238000005065 mining Methods 0.000 claims abstract description 46
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- 238000005516 engineering process Methods 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims abstract description 11
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- 239000011435 rock Substances 0.000 claims abstract description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
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- 239000003795 chemical substances by application Substances 0.000 claims 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 14
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- 239000007789 gas Substances 0.000 description 49
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- 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
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- 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
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Abstract
The invention discloses a kind of method for increasing for coal bed gas low yield wellblock, comprising the following steps: the quasi- low yield wellblock for implementing yield-increasing technology of selection；Horizontal well well location is determined according to geologic(al) factor, engineering factor and mining factor between low yield wellblock straight well or cluster well；The deflecting in stratum, by horizontal segment design in coal seam or coal seam country rock；Staged fracturing transformation is carried out to horizontal segment using more cluster perforating and fracturing technologies are segmented, forms multistage multiclass Fracture Systems；Pressing crack construction is carried out, the coal bed gas well down-hole string on horizontal well periphery is proposed, changes mining well head into fracture well head, and well head is closed；During pressing crack construction, pump note proppant and fracturing fluid with low damage；It will be pumped under the coal bed gas well sand washing on horizontal well periphery after pressure break, continue mining, horizontal well also mining together.The present invention carries out the zonal secondary storey increase design of integration using horizontal well pair low yield Coal-bed Methane Multi, has the advantages that the transformation period is short, quick, investment is low.
Description
Technical field
The invention belongs to cbm development technical field, in particular to a kind of volume increase sides for coal bed gas low yield wellblock
Method.
Background technique
Coalbed Methane In China exploitation experienced nearly 40 years courses, and the coal bed gas well constructed at present has more than 17000 mouths, is running
More than 12000 mouths, methane output in 2018 is 72.6 × 108 m3, in addition to being located at 5000 mouthfuls or so of the Shanxi Province southeast
Coal bed gas well realizes outside commercial development, and other areas can not commercial operation because of low yield.Suitable one in these stripper wells
Partial resources supplIes be it is extraordinary, i.e., air content and resource abundance all meet the needs of commercial development, only develop work
Skill technology is difficult to caused by meet demand, and stop over is taken out, partially in operation of being in debt for part at present, at chicken ribs engineering.
The imbalance between supply and demand of China's natural gas is very serious, and for coal bed gas as a kind of clear energy sources, development and utilization are to day
The main supplement of right gas supply.Secondary transformation is carried out to low yield coal bed gas well, yield can be significantly promoted, meet the need in market
It asks.It in addition to this, is the current work of effective way and the Chinese government that atmosphere quality improves for coal with gas.Thus
As it can be seen that all urgent need forms a set of effective coal bed gas stripper well storey increase design method body from the energy and environmental
System, can not only for the reproducing of stripper well, technological approaches is provided up to production, can also be provided for the cbm development of the new well of new block
It uses for reference.
Part experts and scholars from geologic(al) factors such as construction location, karst collapse col umn, tomographies, be drilled in well and hydraulic fracturing process and store up
Engineering factors and the casing pressure controls such as layer pollution, drain age velocity, power failure stop taking out etc. minings factor 3 in terms of to coal bed gas stripper well
Crack cause carry out detailed analysis, and propose with nested drilling well, short radius hydraulic jetting drilling-well, Slim Hole Sidetracking Technology, secondary
The individual wells storey increase design technology such as hydraulic fracturing realizes the secondary transformation volume increase of the coal bed gas individual well based on different reason for low yield, obtains
Certain effect of increasing production.But there is presently no carry out the zonal secondary storey increase design of integration for low yield Coal-bed Methane Multi
The research of technology.
Chinese invention patent (application publication number: 102493790 A of CN) discloses a kind of method for increasing yield of coal bed gas, including
Step: mining straight well is drilled in the stable region of geological structure；The horizontal segment of horizontal well is drilled in the region of geologic structure complexity
Wellbore is connected to mining straight well；After the completion of the horizontal section wellbore, casing tripping in horizontal segment casing is opened along two: along the horizontal segment
Casing tripping in steering drilling tool is drilled with multi-branched horizontal well via the connectivity points of the horizontal well and the mining straight well；Described
The horizontal segment of horizontal well implements the complete well of pressure break.The present invention utilizes and is drilled with multi-branched horizontal well after horizontal well is connected to mining well
Mode is to increase the production capacity of coal bed gas, i.e., in such a way that U-shaped well cooperation multi-branched horizontal well is developed jointly, the object of research is
The changeable production zone of geologic structure is not directed to the volume increase exploitation of coal bed gas low yield wellblock.
Chinese invention patent (application publication number: 109577919 A of CN) discloses coal bed gas in a kind of low permeability coal seam
Recovery method, this method comprises: determining the biggest principal stress direction in low permeability coal seam；Be arranged in the low permeability coal seam to
Few two mouthfuls of big Horizontal lane wells；The horizontal segment two sides of every mouthful big Horizontal lane well are set in described at least two mouthfuls big Horizontal lane wells
More mouthfuls of producing wells are set, and the diameter of every mouthful of producing well is less than the diameter of the horizontal segment of the big Horizontal lane well；By it is described extremely
Few two mouthfuls big Horizontal lane well and the more mouthfuls of producing wells pair
Coal bed gas in the low permeability coal seam is exploited.Horizontal well uses major diameter horizontal segment in the present invention, is arranged in low
It permeates in hard coal seam, position is more single, does not carry out fracturing reform to horizontal segment, and be not directed to coal bed gas low yield wellblock
Volume increase exploitation.
Summary of the invention
Aiming at the shortcomings in the prior art, the present invention provides a kind of method for increasing for coal bed gas low yield wellblock, with
The well yield and economic benefit for improving every mouthful of coal bed gas well in gang of wells, with the transformation period is short, quick, investment is low excellent
Point.
To achieve the object of the present invention, using following technical scheme:
A kind of method for increasing for coal bed gas low yield wellblock, comprising the following steps:
Step 1: selecting whole low yield, but resource abundance can satisfy the coal bed gas wellblock of commercial development demand as quasi- implementation
The low yield wellblock of method for increasing.
Preferably, the gas output per well of most straight wells or cluster well is lower than current Technological Economy item in the low yield wellblock
1000 m of recommended minimum value of commercial development under part3/ d, and the coal bed gas resource abundance of low yield wellblock exploitation interval of interest is big
The recommended minimum value 1 × 10 of commercial development under current condition of technology and economy8 m3/km2。
Step 2: determining water according to geologic(al) factor, engineering factor and mining factor between low yield wellblock straight well or cluster well
Horizontal well well location.
Preferably, the determining foundation of horizontal well well location described in step 2 includes:
(1) reservoir is stablized: without tomography, karst collapse col umn and big fracture zone in the coverage of later period pressure break；
(2) far from water-bearing layer: later period pressure break cannot link up water-bearing layer；
(3) reservoir can be transformed: reservoir has certain thickness, and has the short ground that can be transformed, and wanting after the transformation of non-coal seam reservoirs can be with
Coal seam is linked up, and coal seam will have certain thickness, it is sufficient to provide stable coal bed gas；
(4) horizontal segment moves towards: selection gist principal direction of stress, main cranny development direction and the structural factor of horizontal well trend are set
Fixed, from engineering construction angle, it is most safe that horizontal segment trend is parallel to orientation of principal stress construction；It migrates and produces from coal bed gas
Angle out, horizontal segment trend are most advantageous perpendicular to major fracture direction；From hydraulic fracturing angle, horizontal segment is moved towards perpendicular to most flood
Extension and opening of the flat principal direction of stress most useful for crack；
(5) stratigraphic dip: for the mining convenient for engineering construction and later period coal bed gas, horizontal well should be open by stratum updip direction,
Dip down direction drilling；It is depressured for the mining of later period entire reservoir, the lower curtate position of construction is located at for the straight well of mining, i.e., entirely
Strengthen the minimum point of interval；
(6) surface conditions: there is the well site area for being sufficiently used for drilling well and pressing crack construction on ground；
(7) the mining time limit: pressure break does not interfere with underground coal mine mining operation, while to have enough minings, recoup the investment year
Limit, mining operation does not interfere with this well at least 5 years.
Preferably, the horizontal well includes U-shaped well or L-type well.
Step 3: hardness it is moderate, without in collapsing, undergauge and the stratum of leakage to horizontal well deflecting, the horizontal segment of horizontal well
Design is in the strong coal seam of the property be transformed or coal seam country rock, and depending on horizontal section length is according to equipment construction ability, well track is full
Sufficient later period pressure break, mining tubing string tripping in requirement.
Preferably, when coal seam reservoirs are hard coal, horizontal segment selection is constructed in coal seam, roof or seat earth, into
One step, to guarantee the smooth of coal bed gas product, horizontal segment can preferentially be selected in coal seam；When coal seam reservoirs include cherry coal, water
Flat section construction is in roof or seat earth.
Preferably, horizontal well is if L-type well, then reduces hole curvature as far as possible, to improve oil pumping oil pipe and sucker rod
Operating condition.
Step 4: staged fracturing transformation being carried out to horizontal segment using more cluster perforating and fracturing technologies are segmented, forms multiple pressure breaks
Section, each fracturing section includes multiple pressure break clusters, and stress interference is generated between adjacent fracturing section, adjacent pressure break cluster, crack is promoted to turn
To the multistage multiclass Fracture Systems of formation achieve the purpose that reproduce artificial permeation's layer.
Preferably, the staged fracturing technology includes the double envelope single deck tape-recorder staged fracturing of horizontal well, insulates in horizontal well casing pipe
Device sliding sleeve staged fracturing technology, horizontal well hydraulic sand blasting staged fracturing technology, open hole packer sliding sleeve staged fracturing technology or change
Learn temporarily stifled rubber plug staged fracturing technology.
Preferably, the pressure break segment length in the more shower holes of segmentation is 80 ~ 100 m, and adjacent pressure break cluster spacing is 10 ~ 20
M, the length of each pressure break cluster are 0.75 ~ 1.00 m, and the shot density of each pressure break cluster is 8 ~ 20 holes/m, the spiral in pressure break cluster
Perforation phase angle is 60 ° ~ 180 °.
Step 5: carrying out pressing crack construction, multiple coal bed gas well down-hole strings on horizontal well periphery are all proposed, by mining
Well head changes fracture well head into, and ensures that well head is closed.
Step 6: during pressing crack construction, pump note proppant and fracturing fluid with low damage, pump injection pressure power do not consider horizontal well and its
Whether the coal bed gas well on periphery links up.
Preferably, the fracturing fluid with low damage is other than having prop-carrying capacity, is also equipped with that anti-water-sensitive, anti-speed is quick, waterproof
Lock and the ability for reducing frictional resistance.
Step 7: it will be pumped under the coal bed gas well sand washing on horizontal well periphery after pressure break, continue mining, horizontal well also mining together.
Compared with prior art, the present invention can obtain it is following the utility model has the advantages that
The present invention provides a kind of yield-increasing technologies for coal bed gas low yield wellblock, and U-shaped well is used in low yield Coal-bed Methane Multi
Or L-type well carries out the secondary storey increase design of integration of more wells in region, can effectively improve the list of every mouthful of coal bed gas well in gang of wells
Well production and economic benefit, compared with the secondary renovation technique of single coal bed gas stripper well, have transformation the period it is short, it is quick, throw
Enter low advantage.
The horizontal segment of horizontal well can design in the strong coal seam of the property be transformed or coal seam country rock, and coal seam includes cherry coal and hard
Coal expands the alternative of horizontal well arrangement.
Be segmented the pressure break segment length in more shower holes, adjacent pressure break cluster spacing, pressure break cluster length, the shot density of pressure break cluster and
The range at the spiral perforation phase angle in pressure break cluster, can effectively ensure that the formation of multistage multiclass Fracture Systems, be coal bed gas
Volume increase provides preparation.
Detailed description of the invention
Fig. 1 is coalbed methane well network plane of arrangement figure in embodiment；
Fig. 2 is that horizontal segment is located at coal seam schematic diagram in embodiment one；
Fig. 3 is the more shower hole schematic diagrames of fracturing section；
Fig. 4 is that the more shower hole induced stresses of fracturing section promote crack to turn to schematic diagram；
Fig. 5 is that horizontal segment is located at roof schematic diagram in embodiment two；
Fig. 6 is that three kinds of horizontal segments of embodiment are located at seat earth schematic diagram.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Embodiment one
In conjunction with Fig. 1 to Fig. 4, the present invention protects a kind of method for increasing for coal bed gas low yield wellblock.
A kind of method for increasing for coal bed gas low yield wellblock, comprising the following steps:
Step 1: selection meets recommended minimum value 1000 of the gas output per well lower than commercial development under current condition of technology and economy
m3/ d, and the coal bed gas resource abundance of low yield wellblock exploitation interval of interest is greater than commercial development under current condition of technology and economy
Recommended minimum value 1 × 108 m3/km2Coal bed gas wellblock as the quasi- low yield wellblock for implementing method for increasing, coal bed gas wellblock includes
Multiple coal bed gas stripper wells 6.
Step 2: determining Horizontal Well according to geologic(al) factor, engineering factor and mining factor between the cluster well of low yield wellblock
Position.
Horizontal well includes that U-shaped well or L-type well are illustrated by taking U-shaped well as an example in the present embodiment, and U-shaped well is by horizontal well
Section 1 and vertical well section 2 form, and net horizontal section 1 is made of vertical section 101 and horizontal segment 102.
When selecting horizontal well well location, determined according to geologic(al) factor, engineering factor and mining factor, wherein geologic(al) factor
Including following five aspects:
First is that without the stabilization reservoir of tomography, karst collapse col umn and big fracture zone in the coverage of selection later period pressure break.
Second is that selecting the reservoir far from water-bearing layer, interference of the water to engineering construction in later period fracturing process is prevented.
Third is that the coal seam chosen will have certain thickness, it is sufficient to provide stable coal bed gas.
Fourth is that the selection gist principal direction of stress of horizontal well trend, main cranny development direction and structural factor setting, from work
Journey construction angle, it is most safe that horizontal segment trend is parallel to orientation of principal stress construction；From coal bed gas migration and production angle,
Horizontal segment trend is most advantageous perpendicular to major fracture direction；From hydraulic fracturing angle, horizontal segment trend is answered perpendicular to maximum horizontal master
Extension and opening of the power direction most useful for crack.
Fifth is that stratigraphic dip, for the mining convenient for engineering construction and later period coal bed gas, horizontal well should be by stratum updip direction
Opening, dip down direction drilling；It is depressured for the mining of later period entire reservoir, the lower curtate position of construction is located at for the straight well of mining,
Entirely strengthen the minimum point of interval.
Engineering factor includes surface conditions, i.e., there is the well site area for being sufficiently used for drilling well and pressing crack construction on ground.
Mining factor includes the mining time limit, i.e., pressure break does not interfere with underground coal mine mining operation, while to have enough
Mining, the time limit of recouping the investment, mining operation does not interfere with this well at least 5 years, it is ensured that the economy of coal bed gas extraction.
Step 3: hardness it is moderate, without the property in collapsing, undergauge and the stratum of leakage to horizontal well deflecting, according to coal seam reservoirs
Matter determines the position of horizontal segment 102 in horizontal well 1, depending on the length of horizontal segment 102 is according to equipment construction ability, well track
Meet the requirement of later period pressure break, mining tubing string tripping in.
In the present embodiment, horizontal segment 102 is selected in coal seam 3, the coal in coal seam 3 is hard coal, and 3 top reservoir of coal seam is flour sand
Rock stratum 4, lower section reservoir are shale layer 5, and vertical section 101 passes through flour sand rock stratum 4 by ground 111 and connects in coal seam 3 with horizontal segment 102
Logical, vertical well section 2 passes through flour sand rock stratum 4, coal seam 3 and shale layer 5 by ground 111, is connected in coal seam 3 with horizontal segment 102.
Step 4: as shown in figure 3, staged fracturing transformation is carried out to horizontal segment 102 using more cluster perforating and fracturing technologies are segmented,
Multiple fracturing sections 7 are formed, each fracturing section 7 includes multiple pressure break clusters 701；As shown in figure 4, adjacent fracturing section, adjacent pressure break cluster
Between generate stress interference, be divided into three phases and form Fracture Networks, in the first stage 8, crack is along biggest principal stress direction 801
Extend, in second stage 9, crack is gradually turned to, and is spread in horizontal principal stress direction 802, in the phase III 10, is gradually formed more
Grade multiclass Fracture Systems are finally reached the purpose of reconstruction artificial permeation's layer.
Preferably, the length for being segmented the fracturing section 7 in more shower holes is 80 ~ 100 m, and adjacent pressure break cluster spacing 702 is 10 ~ 20
M, 701 length of pressure break cluster are 0.75 ~ 1.00 m, and the shot density of pressure break cluster is 8 ~ 20 holes/m, the spiral perforation phase in pressure break cluster
Parallactic angle 704 is 60 ° ~ 180 °.
Step 5: carrying out pressing crack construction, 6 down-hole string of multiple coal bed gas wells on horizontal well periphery is all proposed, by mining
Well head changes fracture well head into, and ensures that well head is closed.
Step 6: during pressing crack construction, pump note proppant and have quick anti-water-sensitive, anti-speed, Waterproof lock, reduction frictional resistance and
The fracturing fluid with low damage of prop-carrying capacity, in the process, pump injection pressure power do not consider horizontal well and its periphery coal bed gas well whether
It links up.
Step 7: it will be pumped under the coal bed gas well sand washing on horizontal well periphery after pressure break, continue mining, horizontal well also mining together.
Embodiment two
In conjunction with Fig. 5, the difference between this embodiment and the first embodiment lies in: the horizontal segment of horizontal well is arranged in roof, i.e. flour sand
In rock stratum 401, at this point, coal seam is made of hard coal 11 and 12 two parts of cherry coal, the pressure break cluster that horizontal segment pressure break is formed is in cherry coal 12
Part exists in the form for squeezing swollen hole 121 and puncturing hole 122, the coal bed gas for mining cherry coal part.
Embodiment three
In conjunction with Fig. 6, the difference between the present embodiment and the second embodiment lies in that: the horizontal segment of horizontal well is arranged in seat earth, i.e. mud stone
In layer 501.
Combine specific implementation process to further describe and explain technical solution of the present invention above, but its protection scope not by
This limitation.Those skilled in the art should all belong to without departing from all equivalent modifications and change in spirit and scope of the invention
In protection scope of the present invention.
Claims (8)
1. a kind of method for increasing for coal bed gas low yield wellblock, it is characterised in that: the following steps are included:
Step 1: selecting whole low yield, but resource abundance can satisfy the coal bed gas wellblock of commercial development demand as quasi- implementation
The low yield wellblock of method for increasing；
Step 2: determining level according to geologic(al) factor, engineering factor and mining factor between the straight well or cluster well of low yield wellblock
Well well location；
Step 3: hardness it is moderate, without to horizontal well deflecting, the horizontal segment of horizontal well is designed in collapsing, undergauge and the stratum of leakage
In coal seam or coal seam country rock, depending on horizontal section length is according to equipment construction ability, well track meets later period pressure break, mining pipe
The requirement of column tripping in；
Step 4: staged fracturing transformation being carried out to horizontal segment using more cluster perforating and fracturing technologies are segmented, forms multiple fracturing sections, often
A fracturing section includes multiple pressure break clusters, and stress interference is generated between adjacent fracturing section, adjacent pressure break cluster, forms multistage multiclass crack
System；
Step 5: carrying out pressing crack construction, the coal bed gas well down-hole string on horizontal well periphery is all proposed, mining well head is changed into
Fracture well head, and ensure that well head is closed；
Step 6: during pressing crack construction, pump note proppant and fracturing fluid with low damage；
Step 7: it will be pumped under the coal bed gas well sand washing on horizontal well periphery after pressure break, continue mining, horizontal well also mining together.
2. method for increasing according to claim 1, it is characterised in that: most straight wells in low yield wellblock described in step 1
Or the gas output per well of cluster well is lower than 1000 m of recommended minimum value of commercial development under current condition of technology and economy3/ d, and
The coal bed gas resource abundance of low yield wellblock exploitation interval of interest is greater than the minimum of commercial development under current condition of technology and economy and wants
Evaluation 1 × 108 m3/km2。
3. using method for increasing described in claim 1, it is characterised in that: the foundation that horizontal well well location described in step 2 determines
Include:
(1) reservoir is stablized: without tomography, karst collapse col umn and big fracture zone in the coverage of later period pressure break；
(2) far from water-bearing layer: later period pressure break cannot link up water-bearing layer；
(3) reservoir can be transformed: reservoir has certain thickness, and has the short ground that can be transformed, and wanting after the transformation of non-coal seam reservoirs can be with
Coal seam is linked up, and coal seam will have certain thickness, it is sufficient to provide stable coal bed gas；
(4) horizontal segment moves towards: selection gist principal direction of stress, main cranny development direction and the structural factor of horizontal well trend are set
Fixed, from engineering construction angle, it is most safe that horizontal segment trend is parallel to orientation of principal stress construction；It migrates and produces from coal bed gas
Angle out, horizontal segment trend are most advantageous perpendicular to major fracture direction；From hydraulic fracturing angle, horizontal segment is moved towards perpendicular to most flood
Extension and opening of the flat principal direction of stress most useful for crack；
(5) stratigraphic dip: horizontal well should be open by stratum updip direction, and dip down direction drilling, and the straight well for mining is located at
The minimum point of interval is entirely strengthened in the lower curtate position of construction；
(6) surface conditions: there is the well site area for being sufficiently used for drilling well and pressing crack construction on ground；
(7) the mining time limit: pressure break does not interfere with underground coal mine mining operation, while to have enough minings, recoup the investment year
Limit, mining operation does not interfere with this well at least 5 years.
4. method for increasing according to claim 1, it is characterised in that: the horizontal well well type is U-shaped well or L-type well.
5. method for increasing according to claim 1, it is characterised in that: the horizontal segment is when selecting position, if coal seam reservoirs
For hard coal, horizontal segment is constructed in coal seam, roof or seat earth；If coal seam reservoirs include cherry coal, horizontal segment is constructed in coal seam
Top plate or seat earth.
6. method for increasing according to any one of claims 1 to 5, it is characterised in that: the fracturing section in the more shower holes of segmentation
Length is 80 ~ 100 m, and the spacing of adjacent pressure break cluster is 10 ~ 20 m, and the length of pressure break cluster is 0.75 ~ 1.00 m, and pressure break cluster is penetrated
Hole density is 8 ~ 20 holes/m, and the phase angle of spiral perforation is 60 ° ~ 180 ° in pressure break cluster.
7. method for increasing according to claim 1, it is characterised in that: the staged fracturing technology includes the double envelopes of horizontal well
It is packer sliding sleeve staged fracturing technology in single deck tape-recorder staged fracturing, horizontal well casing pipe, horizontal well hydraulic sand blasting staged fracturing technology, naked
Eye packer sliding sleeve staged fracturing technology or rubber breaking agent for chemical temporary-plugging rubber plug staged fracturing technology.
8. method for increasing according to claim 1, it is characterised in that: the fracturing fluid with low damage takes sand energy in addition to having
Outside power, it is also equipped with quick anti-water-sensitive, anti-speed, Waterproof lock and the ability for reducing frictional resistance.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980643A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Coal bed gas horizontal well construction method and coal bed gas horizontal well |
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| CN117072133A (en) * | 2023-10-17 | 2023-11-17 | 中国煤炭地质总局勘查研究总院 | Fracturing method for reinforced seam net of deep coal-bed gas well reservoir |
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| CN111980643A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Coal bed gas horizontal well construction method and coal bed gas horizontal well |
| CN115637958A (en) * | 2021-07-19 | 2023-01-24 | 中国石油天然气股份有限公司 | Batch mining method for platform horizontal well |
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| CN113605874B (en) * | 2021-08-10 | 2023-02-10 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
| CN115012894A (en) * | 2022-05-31 | 2022-09-06 | 贵州大学 | Ultrasonic wave transformed old well enhanced coal bed gas exploitation method |
| CN117072133A (en) * | 2023-10-17 | 2023-11-17 | 中国煤炭地质总局勘查研究总院 | Fracturing method for reinforced seam net of deep coal-bed gas well reservoir |
| CN117072133B (en) * | 2023-10-17 | 2023-12-26 | 中国煤炭地质总局勘查研究总院 | Fracturing method for reinforced seam net of deep coal-bed gas well reservoir |
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