CN109630066A - The method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation - Google Patents
The method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation Download PDFInfo
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- CN109630066A CN109630066A CN201910145165.0A CN201910145165A CN109630066A CN 109630066 A CN109630066 A CN 109630066A CN 201910145165 A CN201910145165 A CN 201910145165A CN 109630066 A CN109630066 A CN 109630066A
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- 230000020477 pH reduction Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 24
- 235000020681 well water Nutrition 0.000 title claims abstract description 19
- 239000002349 well water Substances 0.000 title claims abstract description 19
- 230000010354 integration Effects 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000004568 cement Substances 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 37
- 239000007966 viscous suspension Substances 0.000 claims abstract description 37
- 239000000243 solution Substances 0.000 claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 239000000725 suspension Substances 0.000 claims description 18
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- -1 aminosuccinic acid fatty acid ester salt Chemical class 0.000 claims description 11
- CKLJMWTZIZZHCS-UHFFFAOYSA-N D-OH-Asp Natural products OC(=O)C(N)CC(O)=O CKLJMWTZIZZHCS-UHFFFAOYSA-N 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 9
- 239000000194 fatty acid Substances 0.000 claims description 9
- 229930195729 fatty acid Natural products 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 239000003381 stabilizer Substances 0.000 claims description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000630 rising effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 241000406668 Loxodonta cyclotis Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to oil gas field production development technical fields, more particularly to a kind of method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation, it is characterized in that: first injecting one section of highly viscous suspension with pump truck with low discharge capacity, push the aqueous fluid in stratum to rear；Recycle cementing truck that cement slurry is injected stratum, for blocking water breakthrough position；Then, one section of highly viscous suspension is injected toward stratum again using pump truck, cement slurry is rearward replaced；It finally is pumped into acidifying solution toward stratum using pump truck, implements acidification de-plugging, wherein the presetting period of cement slurry is greater than 6 hours.Crack and water aquifer are linked up when the present invention is efficiently solved because of acidification, cause oil well to alter by crack with side, bottom aquifer with water injection well or oil reservoir logical, and lead to the aqueous rising even waterflood of oil well.
Description
Technical field
The present invention relates to oil gas field production development technical fields, in particular to low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification
The method of integration of operation.
Background technique
Oil well acidation technology is blocked as a kind of releasing near wellbore zone, and the important storey increase design for improving in-place permeability is arranged
It applies, is used widely in the production development of each elephant, and played important function, especially opened in carbonic acid reservoir
In hair, application is more universal.But as oil field production development enters the middle and later periods, stratum energy is insufficient, and oil field is opened using water filling etc.
Originating party formula causes water ratio in oil well to rise even water logging and stops production；And with the continuous progress of waterflooding extraction, stratum is by outside fluid
The influence of matching is easy to form blocking on stratum, causes yield to decline, need to improve ground using measures such as acidification, pressure breaks
The percolation ability of layer is to meet production requirement, especially low-permeability oilfield, in later development, to ensure production requirement, with greater need for
The well stimulations such as acidification, pressure break are implemented to oil/gas well.However, existing for the oil field and reservoir that use waterflooding extraction mode
The oil well on side, bottom water or neighbouring water injection well be easy to cause water aquifer preferably to be linked up after using acidification measure, cause
Water ratio in oil well rises, and serious person leads to problems such as water logging, water breakthrough even oil well scrap, and severely impacts the production effect in oil field
Benefit, and this problem can not be avoided preferably with current existing Acidizing Technology.For this purpose, each elephant be badly in need of one kind can be effective
Improve stratum filtration situation, improve oil well productivity, and aqueous rising, water logging, water breakthrough caused by being avoided that because of measure operation etc. are asked
The acidification new technology of topic.
Summary of the invention
In order to solve the above technical problems, the invention proposes low-permeability oilfield high-water-cut oil-producing well water blockoff and being acidified integration of operation
Method, this method are combined by cementing plugging technology with Acidizing Technology, one kind of formation it is new can give full play to acidification
The effect of measure, but can effectively avoid it is aqueous rise, water logging or new Acidizing Technology the problems such as water breakthrough.
Combine work with acidification the technical scheme is that the present invention provides a kind of low-permeability oilfield high-water-cut oil-producing well water blockoffs
The method of industry first injects one section of highly viscous suspension with pump truck with low discharge capacity, pushes the aqueous fluid in stratum to rear；It is sharp again
Cement slurry is injected into stratum with cementing truck, for blocking water breakthrough position；Then, one section of high viscosity is injected toward stratum again using pump truck
Suspension, cement slurry is rearward replaced；It finally is pumped into acidifying solution toward stratum using pump truck, implements acidification de-plugging, wherein water
The presetting period of mud is greater than 6 hours.
The method of the low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation, includes the following steps:
Step 1: preparing before acidizing treatment, it gets out cement slurry, acidifying solution and highly viscous suspension；
Step 2: first injecting one section of highly viscous suspension with pump truck with low discharge capacity, push the water or other fluid in stratum to rear；
Step 3: cement slurry is injected stratum using cementing truck, for blocking water breakthrough position；Wherein, the presetting period of cement slurry
Greater than 6 hours；
Step 4: injecting one section of highly viscous suspension toward stratum again using pump truck, cement slurry is rearward replaced；
Step 5: entering acidifying solution toward stratum metaideophone using pump truck, implement acidification de-plugging；
Step 6: closing well, after 6 hours, the row of returning goes into operation.
The highly viscous suspension is by 3.5% ~ 4.0% oligomeric aminosuccinic acid fatty acid ester salt, 0.4% ~ 0.5% first
Acid, 1.0% ~ 2.0%KCl and 93.5% ~ 95.1%H2O is mixed by above-mentioned mass ratio；Highly viscous 25 DEG C of the outstanding sand liquid
Viscosity be greater than 100mPa.
The chemical structural formula of the oligomeric aminosuccinic acid fatty acid ester salt: molecular formula (C7H8O7N+NR2)nCl-,
In, R C12H25~C18H37, n is 1 ~ 3.
The cement slurry is mixed by 50% ~ 70% G grades of cementing concrete, 28% ~ 49.5% clear water and 0.5 ~ 2.0% retarder
It forms.
The acidifying solution be by 8~15% hydrochloric acid, 1~3% fluoboric acid, 1~2% hydrofluoric acid, 1~2% acidification corrosion inhibiter,
0.5~1% ferrous stability, 0.5~1% clay stabilizer and 88~76% clear water mix.
The highly viscous quantities of suspension of first segment is greater than 5m in the highly viscous suspension3；Described is highly viscous
The highly viscous quantities of suspension of second segment is the half of the highly viscous quantities of suspension of first segment in suspension；The cement slurry
Dosage be acidifying solution dosage 1/2 ~ 2/3；The dosage of acidifying solution is 1.7 times or so of the total dosage of highly viscous suspension.
Described is first 300-400L/min with the low discharge capacity that low discharge capacity is injected in one section of highly viscous suspension with pump truck；
The low discharge capacity that the highly viscous suspension of second segment, cement slurry and acidifying solution are all made of 300-400L/min is pumped into.
The invention has the advantages that the invention is to be combined by cementing plugging technology with Acidizing Technology, one kind of formation
The new effect that can give full play to acidification measure but effectively avoid it is aqueous rise, water logging or new acidification the problems such as water breakthrough
Technology.Compared with prior art, technical advantage of the invention is as follows:
(1) compared with conventional acidulation, crack and water aquifer are linked up when solving because of acidification, cause oil well and water injection well or oil reservoir
Aqueous rising even waterflood that is logical, and leading to oil well is altered with side, bottom aquifer in hypertonic channel；
(2) compared with conventional acidulation, the present invention realizes water blockoff and combines with acid stimulation measure, improves measure effect and has
Efficiency；
(3) compared with previous water blockoff and Acidizing Technology, the present invention disposably implements water blockoff and acidizing treatment, site operation side
Just, construction efficiency is improved；
(4) compared with previous water shutoff agent, cheap cement slurry is used in the present invention, is conducive to save the cost, improves benefit；
(5) present invention is conducive to increase substantially the yield and recovery ratio of oil gas field, improves the production efficiency and benefit in oil field.
Detailed description of the invention
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, but not as
Limitation of the invention:
Fig. 1 is the method effect diagram of a kind of low-permeability oilfield high-water-cut oil-producing well water blockoff of the present invention and acidification integration of operation.
Specific embodiment
Embodiment 1
The method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation first injects one section of high viscosity with pump truck with low discharge capacity
Suspension, push the aqueous fluid in stratum to rear；Recycle cementing truck that cement slurry is injected stratum, for blocking water breakthrough portion
Position；Then, one section of highly viscous suspension is injected toward stratum again using pump truck, cement slurry is rearward replaced；Finally utilize pump
Vehicle is pumped into acidifying solution toward stratum, implements acidification de-plugging, wherein the presetting period of cement slurry is greater than 6 hours.Wherein, low discharge capacity is
300-400L/min。
The highly viscous suspension is by 3.5% ~ 4.0% oligomeric aminosuccinic acid fatty acid ester salt, 0.4% ~ 0.5% first
Acid, 1.0% ~ 2.0%KCl and 93.5% ~ 95.1%H2O is mixed by above-mentioned mass ratio；Highly viscous 25 DEG C of the outstanding sand liquid
Viscosity be greater than 100mPa.
The cement slurry is mixed by 50% ~ 70% G grades of cementing concrete, 28% ~ 49.5% clear water and 0.5 ~ 2.0% retarder
It forms.
The acidifying solution be by 8~15% hydrochloric acid, 1~3% fluoboric acid, 1~2% hydrofluoric acid, 1~2% acidification corrosion inhibiter,
0.5~1% ferrous stability, 0.5~1% clay stabilizer and 88~76% clear water mix.
The highly viscous quantities of suspension of first segment is greater than 5m in the highly viscous suspension3；Described is highly viscous
The highly viscous quantities of suspension of second segment is the half of the highly viscous quantities of suspension of first segment in suspension；The cement slurry
Dosage be acidifying solution dosage 1/2 ~ 2/3, be mass ratio；The dosage of acidifying solution is 1.7 times of the total dosage of highly viscous suspension
Left and right.
Embodiment 2
The method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation, includes the following steps:
Step 1: preparing before acidizing treatment, it gets out cement slurry, acidifying solution and highly viscous suspension；
Step 2: first injecting one section of highly viscous suspension with pump truck with low discharge capacity, push the water or other fluid in stratum to rear；
Acidifying solution is avoided to injure grout off effect simultaneously；
Step 3: cement slurry is injected stratum using cementing truck, for blocking water breakthrough position；Wherein, the presetting period of cement slurry
Greater than 6 hours；
Step 4: injecting one section of highly viscous suspension toward stratum again using pump truck, cement slurry is rearward replaced；
Step 5: entering acidifying solution toward stratum metaideophone using pump truck, implement acidification de-plugging；
Step 6: closing well, after 6 hours, the row of returning goes into operation.
The highly viscous suspension is by 3.5% oligomeric aminosuccinic acid fatty acid ester salt, 0.4% formic acid, 1.0%KCl
And 95.1%H2O is mixed by above-mentioned mass ratio；The viscosity of highly viscous 25 DEG C of the outstanding sand liquid is greater than 100mPa.
The chemical structural formula of the oligomeric aminosuccinic acid fatty acid ester salt: molecular formula (C7H8O7N+NR2)nCl-,
In, R C12H25~C18H37, n is 1 ~ 3.
The cement slurry is mixed by 50% G grades of cementing concrete, 49.5% clear water and 0.5% retarder.
The acidifying solution is steady by 8% hydrochloric acid, 1% fluoboric acid, 1% hydrofluoric acid, 1% acidification corrosion inhibiter, 0.5% iron ion
Determine agent, 0.5% clay stabilizer and 88% clear water to mix.
The highly viscous quantities of suspension of first segment is greater than 5m in the highly viscous suspension3；Described is highly viscous
The highly viscous quantities of suspension of second segment is the half of the highly viscous quantities of suspension of first segment in suspension；The cement slurry
Dosage be acidifying solution dosage 1/2 ~ 2/3, be mass ratio；The dosage of acidifying solution is 1.7 times of the total dosage of highly viscous suspension
Left and right.
Described is first 300-400L/min with the low discharge capacity that low discharge capacity is injected in one section of highly viscous suspension with pump truck；
The low discharge capacity that the highly viscous suspension of second segment, cement slurry and acidifying solution are all made of 300-400L/min is pumped into.
Embodiment 3
It is substantially the same manner as Example 2, it is a difference in that:
The highly viscous suspension be by 4.0% oligomeric aminosuccinic acid fatty acid ester salt, 0.5% formic acid, 2.0%KCl and
93.5%%H2O is mixed by above-mentioned mass ratio；The viscosity of highly viscous 25 DEG C of the outstanding sand liquid is greater than 100mPa.
The cement slurry is mixed by 70% G grades of cementing concrete, 28%% clear water and 2.0% retarder.
The acidifying solution is stablized by 15% hydrochloric acid, 3% fluoboric acid, 2% hydrofluoric acid, 2% acidification corrosion inhibiter, 1% iron ion
Agent, 1% clay stabilizer and 76% clear water mix.
Embodiment 4
It is substantially the same manner as Example 2, it is a difference in that:
The highly viscous suspension be by 3.8% oligomeric aminosuccinic acid fatty acid ester salt, 0.45% formic acid, 1.5%KCl and
94.25%H2O is mixed by above-mentioned mass ratio；The viscosity of highly viscous 25 DEG C of the outstanding sand liquid is greater than 100mPa.
The cement slurry is mixed by 60% G grades of cementing concrete, 39% clear water and 1% retarder.
The acidifying solution is by 12% hydrochloric acid, 2% fluoboric acid, 1.5% hydrofluoric acid, 1.5% acidification corrosion inhibiter, 0.7~1%
Ferrous stability, 0.7% clay stabilizer and 81. 6% clear water mix.
Embodiment 5
On the basis of embodiment 2 or 3 or 4, the retarder is commercially available conventional retarder.The acidification is with corrosion inhibiter
Commercially available routine corrosion inhibiter, ferrous stability are commercially available conventional ferrous stability；Clay stabilizer is that commercially available conventional clay is steady
Determine agent.
Embodiment 6
Certain oil field X well is applied using low-permeability oilfield high-water-cut oil-producing well water blockoff of the invention and the method for acidification integration of operation
Work, (suspension is highly viscous suspension) construction procedure are as follows:
(1) former well casing column plays in operation team
(2) operation team through wash well
(3) tubing string is acidified under operation team
(4) acidizing treatment
Crack and water aquifer are linked up when method of the invention is efficiently solved because of acidification, cause oil well and water injection well or oil reservoir logical
It crosses crack and alters aqueous rising even waterflood that is logical, and leading to oil well with side, bottom aquifer, effect signal is such as attached drawing
Shown in 1.
The process part that the present embodiment does not describe in detail adheres to the common knowledge of the industry separately, does not describe one by one here.It is involved
And reagent can directly be bought from market.
Claims (8)
1. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation, it is characterized in that: first being infused with pump truck with low discharge capacity
Enter one section of highly viscous suspension, pushes the aqueous fluid in stratum to rear；It recycles cementing truck that cement slurry is injected stratum, uses
In closure water breakthrough position；Then, one section of highly viscous suspension is injected toward stratum again using pump truck, cement slurry is rearward pushed up
It replaces；It finally is pumped into acidifying solution toward stratum using pump truck, implements acidification de-plugging, wherein the presetting period of cement slurry is greater than 6 hours.
2. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 and acidification integration of operation, it is characterized in that:
Include the following steps:
Step 1: preparing before acidizing treatment, it gets out cement slurry, acidifying solution and highly viscous suspension；
Step 2: first injecting one section of highly viscous suspension with pump truck with low discharge capacity, push the water or other fluid in stratum to rear；
Step 3: cement slurry is injected stratum using cementing truck, for blocking water breakthrough position；Wherein, the presetting period of cement slurry
Greater than 6 hours；
Step 4: injecting one section of highly viscous suspension toward stratum again using pump truck, cement slurry is rearward replaced；
Step 5: entering acidifying solution toward stratum metaideophone using pump truck, implement acidification de-plugging；
Step 6: closing well, after 6 hours, the row of returning goes into operation.
3. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 or 2 and acidification integration of operation, feature
Be: the highly viscous suspension be by 3.5% ~ 4.0% oligomeric aminosuccinic acid fatty acid ester salt, 0.4% ~ 0.5% formic acid,
1.0% ~ 2.0%KCl and 93.5% ~ 95.1%H2O is mixed by above-mentioned mass ratio；Highly viscous 25 DEG C of the outstanding sand liquid glues
Degree is greater than 100mPa.
4. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 3 and acidification integration of operation, it is characterized in that:
The chemical structural formula of the oligomeric aminosuccinic acid fatty acid ester salt: molecular formula (C7H8O7N+NR2)nCl-, wherein R C12H25
~C18H37, n is 1 ~ 3.
5. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 or 2 and acidification integration of operation, feature
Be: the cement slurry is mixed by 50% ~ 70% G grades of cementing concrete, 28% ~ 49.5% clear water and 0.5 ~ 2.0% retarder.
6. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 or 2 and acidification integration of operation, feature
Be: the acidifying solution be by 8~15% hydrochloric acid, 1~3% fluoboric acid, 1~2% hydrofluoric acid, 1~2% acidification corrosion inhibiter, 0.5~
1% ferrous stability, 0.5~1% clay stabilizer and 88~76% clear water mix.
7. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 or 2 and acidification integration of operation, feature
Be: the highly viscous quantities of suspension of first segment is greater than 5m in the highly viscous suspension3；The highly viscous suspension
The middle highly viscous quantities of suspension of second segment is the half of the highly viscous quantities of suspension of first segment；The dosage of the cement slurry
It is the 1/2 ~ 2/3 of acidifying solution dosage；The dosage of acidifying solution is 1.7 times of total dosage of highly viscous suspension or more.
8. the method for low-permeability oilfield high-water-cut oil-producing well water blockoff according to claim 1 or 2 and acidification integration of operation, feature
Be: described first uses pump truck with the low discharge capacity in low discharge capacity one section of highly viscous suspension of injection for 300-400L/min；Second
The low discharge capacity that the highly viscous suspension of section, cement slurry and acidifying solution are all made of 300-400L/min is pumped into.
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| CN110173248A (en) * | 2019-06-12 | 2019-08-27 | 西安方正石油科技有限责任公司 | A kind of water blockoff turnaround fracture technique suitable for the old oil of water breakthrough, gas well |
| CN110242248A (en) * | 2019-06-04 | 2019-09-17 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of sandstone reservoir water blockoff acidification technique method |
| CN110259410A (en) * | 2019-06-28 | 2019-09-20 | 山东德仕石油装备有限公司 | A kind of method that high-water-cut oil-producing well fixed tubular column realizes water blockoff |
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