CN105888604B - A kind of old well in low pressure gas field that is suitable for repeats to transform the method that nearly wellbore formation permanently blocks - Google Patents
A kind of old well in low pressure gas field that is suitable for repeats to transform the method that nearly wellbore formation permanently blocks Download PDFInfo
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- CN105888604B CN105888604B CN201610229259.2A CN201610229259A CN105888604B CN 105888604 B CN105888604 B CN 105888604B CN 201610229259 A CN201610229259 A CN 201610229259A CN 105888604 B CN105888604 B CN 105888604B
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 46
- 229920005989 resin Polymers 0.000 claims abstract description 46
- 239000004568 cement Substances 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 230000006735 deficit Effects 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 75
- 238000011084 recovery Methods 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 14
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000001131 transforming effect Effects 0.000 abstract description 4
- 239000002981 blocking agent Substances 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000009096 changqing Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000032696 parturition Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides a kind of methods for being suitable for the old well repetition in low pressure gas field and transforming nearly wellbore formation and permanently blocking, it repeats micron grade resins and cement mixture before transforming, it is pumped into after mixture in nearly wellbore formation, low pressure deficit area's hole and crack around old well is permanently blocked.This old well in low pressure gas field that is suitable for provided by the invention repeats to transform the method that nearly wellbore formation permanently blocks, using micron grade resins and cement mixture, it is pumped into before refracturing in pit shaft surrounding formation, since ultra-fine blocking agent grain diameter is small, it with good mobility and penetrability, can infiltrate through in reservoir pore space, low pressure deficit area's hole and crack around old well are permanently blocked, slow down fracturing fluid leak-off into stratum, improve the seam efficiency of fracturing fluid.
Description
Technical field
It breathes freely field stimulation technology field the invention belongs to low pressure and low permeability, and in particular to it is old that one kind is suitable for low pressure gas field
Well repeats to transform the method that nearly wellbore formation permanently blocks.
Background technology
With the continuous intensification of gas field development degree, low yield inefficient well ratio increases year by year, and stable yields situation is increasingly serious.
To improve well yield, oil/gas well productive potentialities are excavated, selected part main layer sand body is developed, reservoir properties are good, accumulating condition
It is excellent, but the old well development refracturing transformation that Production development is poor compared with offset well.Different from the transformation of new well, old well due to giving birth to for a long time
Production, nearly pit shaft area stratum energy is in debt, causes well killing fluid in the construction process and fracturing fluid wastage big, not only reservoir is made
Into secondary injury, and liquid seam efficiency is low, and fracture extension distance is limited, and the drain cycle is long after transformation, and drain effect is poor, reaches
Target is transformed less than expected.
Changqing oilfields repeat to transform for the old well of low-pressure gas well at present, and well killing fluid is temporarily blocked up only with Low Damage to prevent kill-job
Liquid leak-off, but application effect unobvious, it is impossible to effective solving practical problems.For this purpose, it repeats to change there is an urgent need for inventing a kind of old well in gas field
The permanent block up design method in stratum is made, can be completed with existing fracturing unit permanent to low pressure deficit area reservoir around pit shaft
Closure meets the old well in current gas field and repeats to transform the active demand of anti-filter synergy.
The content of the invention
The purpose of the present invention is overcoming the prior art in the old well of low-pressure gas well repeats to transform, well killing fluid and fracturing fluid leakage
Amount is big, and the problem of expected transformation target is not achieved.
It to repeat to transform what nearly wellbore formation permanently blocked for this purpose, the present invention provides a kind of old wells in low pressure gas field that is suitable for
Method repeats that micron grade resins and cement mixture are pumped into nearly wellbore formation after mixture, low pressure around old well lost before transforming
Dead zone hole and crack permanently block.
Micron grade resins are determined with cement mixed ratio by gas well recovery percent of reserves：
1）When gas well recovery percent of reserves is less than 30%, the weight ratio of resin and cement is 1:9；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, the weight ratio of resin and cement is 2:8；
3）When gas well recovery percent of reserves is more than 60%, the weight ratio of resin and cement is 3:7.
Micron grade resins are determined with injection rate after cement mixture by gas well recovery percent of reserves and gas pay thickness；
1）When gas well recovery percent of reserves is less than 30%, injection rate is every meter of gas pay thickness 8.0m3；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, injection rate is every meter of gas pay thickness 12m3；
3）When gas well recovery percent of reserves is more than 60%, injection rate is every meter of gas pay thickness 15m3。
The gas well recovery percent of reserves with the amount of adopting with actually can the amount of adopting ratio calculation.
The micron order resin grain size is 3.0-12.0 μm.
A kind of old well in low pressure gas field that is suitable for repeats to transform the method that nearly wellbore formation permanently blocks, including following step
Suddenly：
Step 1）Micron grade resins and cement mixed ratio and injection rate are determined according to gas well recovery percent of reserves and gas pay thickness；
Step 2）Micron grade resins after cement mixture with being pumped into nearly wellbore formation；
Step 3）Closing well Hou Ning；
Step 4) nitrogen pressure testing 30MPa, pressure measurement are dropped 30 minutes, if 30 minutes pressure is dropped by less than 0.5MPa, show nearly well
Cylinder formation shut-off success, continues step 5）；If nearly wellbore formation closure is unsuccessful, repeatedly step 2）With step 3）；
Step 5）After closure is qualified, to interval of interest again perforation；
Step 6）Refracturing is transformed.
Step 2）Middle micron grade resins are with pump displacement control after cement mixture in 1-2m3Within/min.
The closing well Hou Ning times are not less than 7 days.
The micron grade resins relative molecular mass is 3000-4000.
The beneficial effects of the invention are as follows：
This old well in low pressure gas field that is suitable for provided by the invention repeats to transform the method that nearly wellbore formation permanently blocks,
Using micron grade resins and cement mixture, it is pumped into before refracturing in pit shaft surrounding formation, since ultra-fine blocking agent grain diameter is small,
It with good mobility and penetrability, can infiltrate through in reservoir pore space, by low pressure deficit area's hole and crack around old well
Permanent closure, slows down fracturing fluid leak-off into stratum, improves the seam efficiency of fracturing fluid.
It is described in further details below in conjunction with attached drawing.
Description of the drawings
Fig. 1 is nearly wellbore formation pressure schematic diagram before gas well is gone into operation；
Fig. 2 is nearly wellbore formation pressure schematic diagram after gas well is gone into operation；
Fig. 3 is that micron grade resins and cement mixture are injected nearly pit shaft area by the method for the present invention, and closure pit shaft low pressure is in debt
Area stratum schematic diagram.
Specific embodiment
Embodiment 1：
A kind of old well in low pressure gas field that is suitable for is present embodiments provided to repeat to transform the side that nearly wellbore formation permanently blocks
Method repeats to be pumped into micron grade resins and cement mixture in nearly wellbore formation after mixture before transforming, by low pressure deficit around old well
Area's hole and crack permanently block.
Technical principle：It by means of micron grade resins, is pumped into before refracturing in pit shaft surrounding formation, due to ultra-fine blocking agent
Grain grain size is small, has good mobility and penetrability, can infiltrate through in reservoir pore space, by low pressure deficit area hole around old well
Gap and crack permanently block, and slow down fracturing fluid leak-off into stratum, improve the seam efficiency of fracturing fluid.
Embodiment 2：
On the basis of embodiment 1, one kind is transformed nearly wellbore formation suitable for the old well repetition in low pressure gas field and is permanently blocked
Method, comprise the following steps：
Step 1）Micron grade resins and cement mixed ratio and injection rate are determined according to gas well recovery percent of reserves and gas pay thickness；
Step 2）Micron grade resins after cement mixture with being pumped into nearly wellbore formation；
Step 3）Closing well Hou Ning；
Step 4) nitrogen pressure testing 30MPa, pressure measurement are dropped 30 minutes, if 30 minutes pressure is dropped by less than 0.5MPa, show nearly well
Cylinder formation shut-off success, continues step 5）；If nearly wellbore formation closure is unsuccessful, repeatedly step 2）With step 3）；
Step 5）After closure is qualified, to interval of interest again perforation；
Step 6）Refracturing is transformed.
Since the Sulige gas field main force of Soviet Union gas pay is low porosity and low permeability reservoir, reservoir permeability is less than 1mD, and resin material is used
It is little to measure scale effect, this research mainly determines resin and superfine cement dosage with gas well recovery percent of reserves and gas pay thickness
Than.Recovery percent of reserves at present the amount of adopting with actually can the amount of adopting calculate.
Micron grade resins are determined with cement mixed ratio by gas well recovery percent of reserves：
1）When gas well recovery percent of reserves is less than 30%, the weight ratio of resin and cement is 1:9；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, the weight ratio of resin and cement is 2:8；
3）When gas well recovery percent of reserves is more than 60%, the weight ratio of resin and cement is 3:7.
Micron grade resins are determined with injection rate after cement mixture by gas well recovery percent of reserves and gas pay thickness；
1）When gas well recovery percent of reserves is less than 30%, injection rate is every meter of gas pay thickness 8.0m3；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, injection rate is every meter of gas pay thickness 12m3；
3）When gas well recovery percent of reserves is more than 60%, injection rate is every meter of gas pay thickness 15m3。
Wherein, step 2）Middle micron grade resins are with pump displacement control after cement mixture in 1-2m3Within/min.
Step 3）The middle closing well Hou Ning times are not less than 7 days.
The micron grade resins used in the present embodiment are the crosslinkings between a kind of amino curing agent and a kind of epoxide
The cured unlimited polymer network of three-dimensional of one kind that reaction generates, molecular structure are as follows.
The micron order resin grain size is 3.0-12.0 μm, relative molecular mass 3000-4000.Due to its grain diameter
It is small, there is good mobility and penetrability, can infiltrate through in reservoir pore space and (shout 0.1-15um in Changqing Gas Fields reservoir hole), have
There are stronger resistance to compression, anti-permeability performance, intensity is high, and means of press seals ability is strong（1000psi/ feet）.Can enter traditional cements or
The region that superfine cement can not all reach can realize the permanent closure to reservoir.The system dosage is few, at low cost, construction
Program is simple, easily operated.There are following features：
（1）Solid Free can penetrate micron order hole；
（2）Infinited-valued logic under Newtonian fluid-liquid condition；
（3）Bond by force can anti-high pressure（23MPa/m）；
（4）Resist chemical (acid/CO2)；
（5）It is complementary with cement；
（6）Contamination resistance is strong（Insufficient mud is overcome to replace）；
（7）Good compatibility（Including water）；
（8）High-ductility（Deformation can reach 20%）；
（9）It high intensity and can bore；
（10）High resiliency, when being tested in the environmental test stove at 162 °F (72 °C), resin material can be
12500psi（86MPa）Pressure under still maintain high resiliency.
Embodiment 3：
Field application example：
XX gas fields are located at XX basins southeast Depression Area XX rift slope belts, and main force's gas pay is glutenite, more densely, is buried
Deep, temperature height is hidden, pressure is high.Since 2009 develop, there are many places leak source at pit shaft oil jacket and skill set, since annular space is with pressure
And gas well pressure is high, using traditional cements or superfine cement operation, repeatedly processing can not still solve.
Introduce micron grade resins for the first time within 2015, formulate site operation scheme and carry out field test, using resin material with
Cement is with 2：8 ratio mixtures implement closure operation.
Work progress:
（1）Resin plugging material is transported to well site；
（2）Mixture micron grade resins and cement；
（3）Mixture compound system simultaneously pumps 20m3, displacement control is in 1-2m3Within/min；
（4）Clean cementing truck and construction pipeline；
（5）It waits solidifying not less than 7 days；
（6）Nitrogen pressure testing 30MPa.
On July 27th, 2015,17:00 live nitrogen vehicle group carries out pressure testing in being covered to 5-1/2 ", and pump truck suppresses 30MPa, surely
Pressure 15 minutes, pressure is qualified, is returned out at skill set valve without gas, nitrogen pressure testing is qualified, blocks successfully.As shown in Figure 1, it does not go into operation
Before, strata pressure is original formation pressure, and stress is respectively to homogeneous；After operation, stress field changes, with mining time not
Disconnected to increase, nearly pit shaft area pressure is gradually reduced, and the pressure drop of biggest principal stress direction is apparently higher than minimum principal stress side
To as shown in Figure 2；Fig. 3 is that micron grade resins and cement mixture are injected nearly pit shaft area, blocks pit shaft low pressure deficit area stratum
Schematic diagram makes up the pressure drop brought by long-term production, reduces and repeats transformation fluid loss.
Refracturing transformation is carried out afterwards, and construction main-process stream is as follows：
Drifting → well-flushing → pressure testing → perforation → fracturing tubing string → fracturing reform → open flow and drain → asks production
1）Drifting：Gauguste cutter outer diameter 115mm, length 1500mm pass to artificial bottom of a well.
2）Well-flushing：Flushing fluid uses clear water, and well-flushing discharge capacity is less than 1.0m3/ min, dosage are specifically calculated according to casing volume,
Flushing fluid content of impurities is returned out no more than 0.2%.
3）Pressure testing：Clear water pressure testing 30.0MPa, pressure is dropped by less than 0.5MPa within 30 minutes.
4）Perforation：Using SYD-102 rifles, 127 bullets carry out perforating job by " perforating design (advice note) ", and emissivity exists
More than 95%, 16 holes of Perforation Density/m, 60 ° of perforation phase angle.Perforated interval error is less than 20cm, and when perforation tightly pays attention to well head, prevents
Only blowout.
5）Fracturing reform：To improve the secondary transformation degree of reservoir, fracturing string is applied using full well Ф 88.39mm oil pipes
Work, operational discharge capacity are controlled in 3.0-4.0m3/min.For improve press after liquid return row and lead and control and spit sand phenomenon, it is preposition in construction
The liquid stage is with the measures such as fluid injection nitrogen and mulling liquid addition fiber.
6）Open flow and drain：It after modification measures, drives a well within 20-40 minutes, open flow initial stage is controlled using Ф 3-8mm oil nozzles
Open flow, discharge capacity 100-200-300l/min.Sleeve gate is closed during open flow drain, accurate recording tubing pressure and casing pressure,
Metering discharge liquid measure.If being unable to blowing, using the timely induced flow drain of other draining modes such as liquid nitrogen gaslift.
7）Ask production：Oil, set pressure it is in a basic balance, tubing pressure when 24 is small in the time rising value be less than 0.05MPa when, turn
Enter to ask production or air water to reach press-in formation breakdown liquid measure more than 80%, and Cl with well lifting rate is gone out-Content undulating value in 3 days
Turn to ask production after less than 5%.Generating method uses " one point method ".
The foregoing examples are only illustrative of the present invention, does not form the limitation to protection scope of the present invention, all
Be with the present invention it is the same or similar design all belong to the scope of protection of the present invention within.The side that the present embodiment does not describe in detail
The common knowledge of the industry owned by France, does not describe one by one here.
Claims (8)
1. a kind of old well in low pressure gas field that is suitable for repeats to transform the method that nearly wellbore formation permanently blocks, it is characterised in that：Weight
By micron grade resins and cement mixture before multiple transformation, it is pumped into after mixture in nearly wellbore formation, by low pressure deficit area hole around old well
Gap and crack permanently block；
Micron grade resins are determined with cement mixed ratio by gas well recovery percent of reserves：
1）When gas well recovery percent of reserves is less than 30%, the weight ratio of resin and cement is 1:9；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, the weight ratio of resin and cement is 2:8；
3）When gas well recovery percent of reserves is more than 60%, the weight ratio of resin and cement is 3:7.
2. a kind of old well in low pressure gas field that is suitable for according to claim 1 repeats to transform what nearly wellbore formation permanently blocked
Method, it is characterised in that：Micron grade resins are determined with injection rate after cement mixture by gas well recovery percent of reserves and gas pay thickness；
1）When gas well recovery percent of reserves is less than 30%, injection rate is every meter of gas pay thickness 8.0m3；
2）When gas well recovery percent of reserves, which is more than 30%, is less than 60%, injection rate is every meter of gas pay thickness 12m3；
3）When gas well recovery percent of reserves is more than 60%, injection rate is every meter of gas pay thickness 15m3。
3. one kind according to claim 1 or 2 is transformed nearly wellbore formation suitable for the old well repetition in low pressure gas field and is permanently sealed
Stifled method, it is characterised in that：The gas well recovery percent of reserves with the amount of adopting with actually can the amount of adopting ratio calculation.
4. a kind of old well in low pressure gas field that is suitable for according to claim 1 repeats to transform what nearly wellbore formation permanently blocked
Method, it is characterised in that：The micron order resin grain size is 3.0-12.0 μm.
5. a kind of old well in low pressure gas field that is suitable for according to claim 1 repeats to transform what nearly wellbore formation permanently blocked
Method, which is characterized in that comprise the following steps：
Step 1）Micron grade resins and cement mixed ratio and injection rate are determined according to gas well recovery percent of reserves and gas pay thickness；
Step 2）Micron grade resins after cement mixture with being pumped into nearly wellbore formation；
Step 3）Closing well Hou Ning；
Step 4) nitrogen pressure testing 30MPa, pressure measurement drop 30 minutes, if 30 minutes pressure is dropped by less than 0.5MPa, with showing nearly pit shaft
Layer blocks successfully, continues step 5）；If nearly wellbore formation closure is unsuccessful, repeatedly step 2）With step 3）；
Step 5）After closure is qualified, to interval of interest again perforation；
Step 6）Refracturing is transformed.
6. a kind of old well in low pressure gas field that is suitable for according to claim 5 repeats to transform what nearly wellbore formation permanently blocked
Method, it is characterised in that：Step 2）Middle micron grade resins are with pump displacement control after cement mixture in 1-2m3Within/min.
7. a kind of old well in low pressure gas field that is suitable for according to claim 5 repeats to transform what nearly wellbore formation permanently blocked
Method, it is characterised in that：The closing well Hou Ning times are not less than 7 days.
8. a kind of old well in low pressure gas field that is suitable for according to claim 1 repeats to transform what nearly wellbore formation permanently blocked
Method, it is characterised in that：The micron grade resins relative molecular mass is 3000-4000.
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| CN107989589B (en) * | 2017-11-28 | 2019-12-03 | 青海九0六工程勘察设计院 | A method of improving heat exchange efficiency after hot dry rock pressure break |
| CN109138954A (en) * | 2018-08-29 | 2019-01-04 | 中国石油大学(北京) | A kind of refracturing method of Unconventional gas |
| CN111155952B (en) * | 2019-12-30 | 2021-08-10 | 山西晋城无烟煤矿业集团有限责任公司 | Method for recycling abandoned coal bed gas well in goaf |
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