CN106526096A - Experimental method for blockage simulation and unplugging evaluation for injection and production well of chemical flooding oilfield - Google Patents
Experimental method for blockage simulation and unplugging evaluation for injection and production well of chemical flooding oilfield Download PDFInfo
- Publication number
- CN106526096A CN106526096A CN201710015220.5A CN201710015220A CN106526096A CN 106526096 A CN106526096 A CN 106526096A CN 201710015220 A CN201710015220 A CN 201710015220A CN 106526096 A CN106526096 A CN 106526096A
- Authority
- CN
- China
- Prior art keywords
- sand
- oil
- quartz sand
- polymer
- tamper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention provides an experimental method for blockage simulation and unplugging evaluation for an injection and production well of a chemical flooding oilfield. Quartz sand is used for simulating rock minerals, thickened oil is used for simulating heavy components, and common polyacrylamide or targeted oilfield used polymer is used for simulating organic macromolecular substances. Blocking substances in different forms are flexibly obtained according to components and proportion of the blocking substances; by the mode of mixing the heavy components with high-viscosity organic substances and the quartz, the problem of uneven mixing is avoided, and the problem that the heavy components or the high-viscosity organic substances are difficultly injected in a saturated mode by a sand-packing model is further solved. Various modes of effectiveness evaluation of unplugging or synergistic oil extraction can be developed, then unplugging effects or synergistic oil extraction data in different methods are obtained or effect data among various parameters are compared in a quantified manner, and a reliable evaluation platform is provided for the oilfield.
Description
Technical field
The invention belongs to oil field development experiment field, and in particular to a kind of chemical flooding oil field injection-production well blocking simulation and de-plugging
The experimental technique of evaluation.
Background technology
With the prolongation of oil field development time, either injection well or producing well, blockage problem is generally existing, its
Injectivity index or production capacity index can all be decreased obviously, even more many for the chemical flooding oil field blocking origin cause of formation, such as macromolecule
Heavy component deposition in oil displacement system, shale, emulsion aggregation, oil, it is drilled well pollution, particle migration, water quality and injection-production method and changes
Becoming etc. can all cause the penetrating power for reducing injection-production well near wellbore zone, and different degrees of to govern injection well normal with producing well
Operation, therefore, process stratum and recover to improve injection well operation quality during near wellbore zone permeability just becomes oilfield development process, carry
One of high oil well output, maintenance high and stable yields and important measures of raising recovery ratio.In view of the different blocking origin causes of formation causes blocking
Feature is also diversified, and chemical flooding oil field injection-production well tamper composition includes polymer, rock forming mineral, inorganic scale
Heavy component deposited in precipitation and oil product etc., is that identification early blocks to alleviate its impact to producing, needs to different special
The tamper levied is simulated and carries out the de-plugging evaluation experimental of different modes.
The content of the invention
For the problems referred to above, it is an object of the invention to provide one kind can easy simulation organic plugging thing and the different de-pluggings of development
The experimental technique of mode effect assessment.
Injection-production well organic plugging thing in chemical flooding oil field is mainly comprising the heavy component deposited in rock forming mineral, oil product and organic
One or more of polymer substance, therefore, using quartz sand come simulation rock mineral, heavy component is simulated using viscous crude,
Polymer is simulated using polyacrylamide or subject oil field application polymer.
For realizing simulation organic plugging thing purpose, the present invention takes technical scheme below：
1) pretreatment is carried out to quartz sand, i.e. Modified Quartz Sand is obtained using silane coupler is modified to quartz sand surface,
Which is made to make oily wet interface into by water is wet；
2) viscous crude is mixed with the Modified Quartz Sand, stands aging at a temperature of target reservoir, obtain oil-sand；
3) oil-sand is mixed with high-viscosity polyacrylamide or subject oil field application polymer solution, is tested
Required tamper sample.
Above-mentioned technical proposal, step 1) in, the quartz sand can be the quartz sand of 40～80 mesh；
The silane coupler may be selected from following at least one：Vinyl three ('beta '-methoxy ethyoxyl) silane, isobutyl group
Triethoxysilane, gamma-aminopropyl-triethoxy-silane, concretely vinyl three ('beta '-methoxy ethyoxyl) silane.
Step 2) in, the viscous crude can be the viscous crude of viscosity 5000-10000mPa.s at 50 DEG C, concretely glue at 50 DEG C
The viscous crude of degree 8000mPa.s.
The viscous crude is 1 with the mass ratio of Modified Quartz Sand:3～1:20, concretely 1:9.
The target reservoir temperature is 45-70 DEG C, concretely 65 DEG C.
The standing aging time is 24-48h, concretely 24h.
Above-mentioned steps 2) in, due to the viscosity of viscous crude it is big, can first by after viscous crude and a small amount of kerosene or toluene mixed diluting again
It is full and uniform with the Modified Quartz Sand to mix, finally slough kerosene or toluene.
Accurate oil content in being extracted to oil-sand by Soxhlet extraction is measured.
The oil content of the oil-sand is 5%-25%, concretely 7.8% (i.e. 100g oil-sands 7.8g containing viscous crude).
Above-mentioned steps 3) in, the oil displacement system performance in its performance of the polymer in tamper and injection process
Differ greatly, viscoelasticity is higher, therefore from high-viscosity polyacrylamide or subject oil field application polymer solution simulating
High visco-elastic material.
The high-viscosity polyacrylamide solution concretely viscosity 10000mPa.s (40 DEG C) normal part hydrolysis
Polyacrylamide solution.
It is described by the operation that oil-sand is mixed with high-viscosity polyacrylamide or subject oil field application polymer solution to be：Will
The high-viscosity polyacrylamide or subject oil field application polymer solution one little thin layer of uniform application on flat board, oil-sand is spread on
On little thin layer, (oil-sand for dropping can continue to be spread on unlapped little thin layer) is then toppled over, finally by the oil-sand granule stripping of adhesion
From stirring, mix homogeneously repeat aforesaid operations until the viscous thing solution content of height contained in oil-sand reaches requirement.
During repetitive operation, the oil-sand for spreading is the oil-sand containing high viscous thing obtained in the previous step, and the purpose of repetitive operation is to allow
In oil-sand, the content of high viscous thing increases.
The tamper sample of above-mentioned gained is the shape that polymer is wrapped in that heavy component wraps up rock forming mineral again
State, can obtain heavy component parcel rock forming mineral, heavy component parcel polymer, organic polymer thing according to demand
Matter parcel rock forming mineral, polymer parcel heavy component, heavy component are wrapped in polymer and wrap up again
The tamper form of rock forming mineral.
The simulation tamper obtained by said method belongs to protection scope of the present invention.
The simulation tamper can be wrapped in heavy component for polymer and wrap up rock forming mineral, heavy component again
Parcel rock forming mineral, heavy component parcel polymer, polymer parcel rock forming mineral, organic polymer
Material parcel heavy component, heavy component are wrapped in the form that polymer wraps up rock forming mineral again.
After obtaining the tamper of different shape, it is to realize different de-plugging mode effect assessment purposes, the present invention takes following
Technical scheme：Using one-dimensional sandpack column, one end is loaded with clean quartz sand, and the other end is loaded with obtained simulation tamper,
By clean quartz sand end constant speed water filling, pressure stability is treated, record pressure and data on flows, then by tamper end empirically scheme
Injection de-plugging system, after closing immersion a period of time, opens valve and continues by clean quartz sand end constant speed water filling, treat that pressure is steady
Fixed, experiment terminates, and records pressure data and calculates permeability before and after contrast.
Due to taking above technical scheme, which has advantages below to the present invention：1st, the present invention can according to tamper component with
Ratio flexibly obtains multi-form tamper.2nd, heavy component proposed by the present invention and high viscous organic substance and the quartz sand side of mixing
Formula not only avoid the uneven problem of mixing, also overcomes heavy component or high viscous organic substance is noted by sandpack column saturation mode
Enter more difficult problem.3rd, the present invention can carry out the effect assessment that various ways de-plugging or potentiation are recovered the oil, and then obtain distinct methods solution
Stifled effect or potentiation oil recovery data quantify to contrast the effect data between each parameter, provide reliable evaluation for oil field and put down
Platform.
Description of the drawings
Workflow diagrams of the Fig. 1 for the embodiment of the present invention 2.
Specific embodiment
Below by specific embodiment, the present invention will be described, but the invention is not limited in this.
Experimental technique used in following embodiments if no special instructions, is conventional method；Institute in following embodiments
Reagent, material etc., if no special instructions, commercially obtain.
The simulation of embodiment 1, organic plugging thing
First from the quartz sand of 40～80 mesh, using vinyl three ('beta '-methoxy ethyoxyl) silane of concentration 0.5%
Coupling agent aqueous solution, at 90 DEG C stirs 45min and quartz sand surface is modified, make oily wet interface into by water is wet；Then by viscosity
8000mPa.s viscous crude (50 DEG C) and dilution with toluene agent by volume 9:After 1 mixed diluting viscosity reduction, then take 50g flux oils and 450g
The full and uniform mixing of Modified Quartz Sand, in 70 DEG C of placement fume hoods, 6h removes diluent, then quiet in 65 DEG C of target reservoir temperature
After putting aging 24h, weigh 5g oil-sands and 7.8% (error of Average oil concentration in three quartz sands is obtained by Soxhlet extraction extraction<
5%)；By viscosity 10000mPa.s (40 DEG C) normal part hydrolyzed polyacrylamide (molecular weight 20,000,000) solution (mass concentration
80 DEG C of uniform applications little thin layer on flat board 8000ppm) is risen to, the above-mentioned oil-sands of 100g is weighed and is spread on little thin layer and then inclines
, the oil-sand for dropping can continue to be spread on unlapped little thin layer, and the oil-sand granule for being finally peeled away adhesion is carried out at 90 DEG C fully
Stirring mixing, the tamper sample for test needed for, the process be repeated twice, by weight method calculate in oil-sand contained by height glue thing
Solution content 19.2%.
Above-mentioned to be merely to illustrate the present embodiment, wherein each component ratio and tamper form can become according to the actual requirements
Change.
Embodiment 2
As shown in figure 1, fill and present one-dimensional sandpack column initially with clean quartz sand, after the completion of water filling carry out original permeability
Determine, by A ends to B ends with 1mL/min constant speed water fillings, treat pressure stability, original permeability D1 is calculated for 234mD；Then will
1 obtained simulation tamper of embodiment, from B ends filling 1/3 clean quartz sand of displacement, continues permanent with 1mL/min by A ends to B ends
Fast water filling, treats pressure stability, and after calculating blocking, permeability D2 is 136mD；By de-plugging agent, (main component is enzyme, quality
Content 1%) with tamper volume ratio 1：2 inject de-plugging system by B ends, after immersion 72h, again by A ends to B ends 1mL/min
Constant speed water filling, treats pressure stability, and after calculating de-plugging, permeability D3 is 216mD.After blocking, core permeability is only initial value
58.1%, after de-plugging system is acted on, to rock core permeability improvement substantially, after de-plugging, core permeability recovers to initial
The 92.3% of value.
Above-mentioned to be merely to illustrate the present embodiment, the wherein clean quartz sand of tamper replaceable 100%, displacement ratio can be with
Adjusted according to experimental program, in addition, the model is not limited only to permeability recovers experimental evaluation, it can also be used to calculate de-plugging potentiation and adopt
Oily experimental evaluation.
Claims (9)
1. it is a kind of simulation organic plugging thing method, including：
1) pretreatment is carried out to quartz sand：Modified Quartz Sand is obtained using silane coupler is modified to quartz sand surface；
2) viscous crude is mixed with the Modified Quartz Sand, stands aging at a temperature of target reservoir, obtain oil-sand；
3) oil-sand is mixed with high-viscosity polyacrylamide or subject oil field application polymer solution, is obtained needed for experiment
Tamper sample.
2. method according to claim 1, it is characterised in that：
Step 1) in, the quartz sand is the quartz sand of 40～80 mesh；
The silane coupler may be selected from following at least one：Vinyl three ('beta '-methoxy ethyoxyl) silane, three second of isobutyl group
TMOS, gamma-aminopropyl-triethoxy-silane.
3. method according to claim 1 and 2, it is characterised in that：Step 2) in, the viscous crude is viscosity at 50 DEG C
5000-10000mPa.s viscous crude；
The viscous crude is 1 with the mass ratio of Modified Quartz Sand：3～1:20；
The target reservoir temperature is 45-70 DEG C；
It is described to stand the aging time for 24-48h.
4. method according to claim 1 and 2, it is characterised in that：Step 2) in, the oil content of the oil-sand is 5%-
25%.
5. the method according to any one of claim 1-4, it is characterised in that：Step 3) in, described high-viscosity poly- third
Acrylamide solution is the normal part hydrolyzed polyacrylamide solution of viscosity 10000mPa.s at 40 DEG C.
6. the method according to any one of claim 1-5, it is characterised in that：Step 3) in, it is described by oil-sand with it is highly concentrated
The polyacrylamide of degree or subject oil field application polymer solution mixing operation be：By high-viscosity polyacrylamide or target
Oil-sand is spread on little thin layer and then is toppled over by field use polymer solution one little thin layer of uniform application on flat board, finally will
The oil-sand granule of adhesion is peeled off, stirring, mix homogeneously, repeats aforesaid operations until the viscous thing solution content of height contained in oil-sand reaches
To requiring.
7. the simulation tamper for being prepared by method any one of claim 1-6.
8. simulation tamper according to claim 7, it is characterised in that：The simulation tamper is polymer
Be wrapped in heavy component wrap up again rock forming mineral, heavy component parcel rock forming mineral, heavy component parcel polymer,
Polymer parcel rock forming mineral, polymer parcel heavy component, heavy component are wrapped in organic high score
Sub- material wraps up the form of rock forming mineral again.
9. a kind of experimental technique for evaluating different de-plugging mode effects, comprises the steps：
Using one-dimensional sandpack column, one end is loaded with clean quartz sand, and the other end is blocked with the simulation described in claim 7 or 8
Thing is loaded, and by clean quartz sand end constant speed water filling, is treated pressure stability, record pressure and data on flows, is then pressed by tamper end
Experimental program injects de-plugging system, after closing immersion a period of time, opens valve and continues by clean quartz sand end constant speed water filling, treat
Pressure stability, experiment terminate, and record pressure data and calculate permeability before and after contrast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710015220.5A CN106526096B (en) | 2017-01-10 | 2017-01-10 | A kind of experimental method of chemical flooding oil field injection-production well blocking simulation and de-plugging evaluation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710015220.5A CN106526096B (en) | 2017-01-10 | 2017-01-10 | A kind of experimental method of chemical flooding oil field injection-production well blocking simulation and de-plugging evaluation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106526096A true CN106526096A (en) | 2017-03-22 |
| CN106526096B CN106526096B (en) | 2019-02-26 |
Family
ID=58335383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710015220.5A Active CN106526096B (en) | 2017-01-10 | 2017-01-10 | A kind of experimental method of chemical flooding oil field injection-production well blocking simulation and de-plugging evaluation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106526096B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100255A (en) * | 2018-08-27 | 2018-12-28 | 中国海洋石油集团有限公司 | A kind of method for separating and analyzing of oil field injection and extraction well plugging object component |
| CN109424349A (en) * | 2017-08-25 | 2019-03-05 | 中国石油天然气股份有限公司 | Fiber takes the acquisition methods and device of sand turning efficiency |
| CN111808589A (en) * | 2020-07-14 | 2020-10-23 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in shaft of polymer injection well of offshore oil field |
| CN111808588A (en) * | 2020-07-14 | 2020-10-23 | 中海石油(中国)有限公司 | Simulation principle and preparation method of plug in near-well zone of polymer injection well of offshore oil field |
| CN111929402A (en) * | 2020-08-12 | 2020-11-13 | 西南石油大学 | Open type experimental device and method for simulating single-section plug unblocking technological process |
| CN113027418A (en) * | 2021-03-15 | 2021-06-25 | 西南石油大学 | Oil field water injection well pollution blockage removal experiment testing device and testing effect evaluation method |
| CN113153220A (en) * | 2021-04-29 | 2021-07-23 | 中国石油天然气股份有限公司 | Method for evaluating dredging effect of gas well shaft |
| CN113528101A (en) * | 2021-07-23 | 2021-10-22 | 中国石油大学(华东) | Outer flexible inner rigid type plugging material and preparation method thereof |
| CN114059998A (en) * | 2021-09-28 | 2022-02-18 | 中国海洋石油集团有限公司 | Chemical flooding injection well and production well blockage simulation device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103224775A (en) * | 2013-04-03 | 2013-07-31 | 中国石油天然气股份有限公司 | Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof |
| CN105067781A (en) * | 2015-09-02 | 2015-11-18 | 中国石油集团渤海钻探工程有限公司 | Foam flooding evaluation device and evaluation method thereof |
| CN106010485A (en) * | 2016-05-23 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | Self-cementing leaking stoppage agent and leaking stoppage method |
-
2017
- 2017-01-10 CN CN201710015220.5A patent/CN106526096B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103224775A (en) * | 2013-04-03 | 2013-07-31 | 中国石油天然气股份有限公司 | Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof |
| CN105067781A (en) * | 2015-09-02 | 2015-11-18 | 中国石油集团渤海钻探工程有限公司 | Foam flooding evaluation device and evaluation method thereof |
| CN106010485A (en) * | 2016-05-23 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | Self-cementing leaking stoppage agent and leaking stoppage method |
Non-Patent Citations (4)
| Title |
|---|
| 中国石油天然气总公司: "《中华人民共和国石油天然气行业标准 SY/T 5862-93》", 6 January 1994 * |
| 安坤: "注聚合物井新型解堵增注技术研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 曹广胜等: "杏南油田注聚井堵塞原因及解堵剂配方研究", 《石油化工高等学校学报》 * |
| 黄利平等: "一种新型注聚合物井解堵体系的研究与应用", 《特种油气藏》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109424349A (en) * | 2017-08-25 | 2019-03-05 | 中国石油天然气股份有限公司 | Fiber takes the acquisition methods and device of sand turning efficiency |
| CN109100255A (en) * | 2018-08-27 | 2018-12-28 | 中国海洋石油集团有限公司 | A kind of method for separating and analyzing of oil field injection and extraction well plugging object component |
| CN111808589A (en) * | 2020-07-14 | 2020-10-23 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in shaft of polymer injection well of offshore oil field |
| CN111808588A (en) * | 2020-07-14 | 2020-10-23 | 中海石油(中国)有限公司 | Simulation principle and preparation method of plug in near-well zone of polymer injection well of offshore oil field |
| CN111808589B (en) * | 2020-07-14 | 2022-12-20 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in shaft of polymer injection well of offshore oil field |
| CN111808588B (en) * | 2020-07-14 | 2022-12-02 | 中海石油(中国)有限公司 | Simulation principle and preparation method of blockage in near-well zone of offshore oilfield polymer injection well |
| CN111929402B (en) * | 2020-08-12 | 2022-03-25 | 西南石油大学 | Open type experimental device and method for simulating single-section plug unblocking technological process |
| CN111929402A (en) * | 2020-08-12 | 2020-11-13 | 西南石油大学 | Open type experimental device and method for simulating single-section plug unblocking technological process |
| CN113027418B (en) * | 2021-03-15 | 2022-04-15 | 西南石油大学 | Oil field water injection well pollution blockage removal experiment testing device and testing effect evaluation method |
| CN113027418A (en) * | 2021-03-15 | 2021-06-25 | 西南石油大学 | Oil field water injection well pollution blockage removal experiment testing device and testing effect evaluation method |
| CN113153220A (en) * | 2021-04-29 | 2021-07-23 | 中国石油天然气股份有限公司 | Method for evaluating dredging effect of gas well shaft |
| CN113153220B (en) * | 2021-04-29 | 2023-01-20 | 中国石油天然气股份有限公司 | Method for evaluating dredging effect of gas well shaft |
| CN113528101A (en) * | 2021-07-23 | 2021-10-22 | 中国石油大学(华东) | Outer flexible inner rigid type plugging material and preparation method thereof |
| CN114059998A (en) * | 2021-09-28 | 2022-02-18 | 中国海洋石油集团有限公司 | Chemical flooding injection well and production well blockage simulation device and method |
| CN114059998B (en) * | 2021-09-28 | 2023-07-28 | 中国海洋石油集团有限公司 | Device and method for simulating blockage of chemical flooding injection well and production well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106526096B (en) | 2019-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106526096A (en) | Experimental method for blockage simulation and unplugging evaluation for injection and production well of chemical flooding oilfield | |
| CN104031625B (en) | De-plugging agent and using method for hypotonic permeable Heterogeneous Sandstone Reservoirs | |
| CN103321606B (en) | A kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method | |
| CN106246150B (en) | A kind of oil field compression fracture remodeling method | |
| CN104109528B (en) | Acidifying liquid capable of sand stabilization and plug removal, and preparation method thereof | |
| CN107965305A (en) | One kind layering refracturing method | |
| CN101280678A (en) | Oil well chemical gorge and disgorge yield increasing and inverse direction regulating block connection working process | |
| CN108166960A (en) | A kind of low-permeability oil deposit transfer drive technique step by step | |
| CN102619492A (en) | Polymer flooding alternating injection method of heterogeneous oil reservoir | |
| US11136865B2 (en) | Integrated construction method of fracturing and tertiary oil recovery for low-permeability reservoir | |
| CN107545088A (en) | A kind of normal pressure shale gas horizontal well volume fracturing method | |
| CN102926701B (en) | A kind of mixed matching water-plugging technology method continuously | |
| CN103334725B (en) | Evaluate the method and device of low-permeability oil deposit displacement validity | |
| CN112541287B (en) | Loose sandstone fracturing filling sand-prevention yield-increase profile control design method | |
| CN103087699A (en) | Sand-carrying profile control agent composition of fracture-cave type oil deposit and profile control method of profile control agent | |
| CN105683330A (en) | Carbonate-based slurry fracturing with solid acid for unconventional reservoir | |
| CN105464639A (en) | Bottom water reservoir fracturing method adopting water-deformable propping agent to control water breakthrough | |
| CN115288647B (en) | Composite capacity expansion method for improving recovery ratio of oil well | |
| CN107446566A (en) | Preposition acid solution and low-kappa number method for deep layer shale gas fractured horizontal well | |
| CN107288599A (en) | Administer the stifled tune method of steam stimulation wells | |
| CN108505982A (en) | It is a kind of using liquid gum plug realize temporary stall to old well refracturing method for increasing | |
| CN103674593A (en) | Device and method for simulating waterflood test in fracturing vertical shaft of low-permeability reservoir | |
| CN109681179A (en) | A kind of acid fracturing method method forming differentiation etching | |
| CN104675370B (en) | Combinational flooding testing method capable of implementing gel injection and polymer solution injection alternately after water flooding | |
| CN104212422A (en) | Heavy oil low cost modified clay-type water shutoff agent and usage method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |