CN109370552A - A method of delaying the uncrosslinked gel solution rate in the plugging agent of oil field - Google Patents
A method of delaying the uncrosslinked gel solution rate in the plugging agent of oil field Download PDFInfo
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- CN109370552A CN109370552A CN201811228405.5A CN201811228405A CN109370552A CN 109370552 A CN109370552 A CN 109370552A CN 201811228405 A CN201811228405 A CN 201811228405A CN 109370552 A CN109370552 A CN 109370552A
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
Abstract
The invention discloses a kind of methods for delaying the uncrosslinked gel solution rate in the plugging agent of oil field.The plugging agent is that uncrosslinked gel is added to the water the uncrosslinked gel aqueous solution being formulated by construction site, in process for preparation, the uncrosslinked gel is added in the aqueous solution containing soluble inorganic salt additive and is configured to plugging agent, specific steps: S1, at the construction field (site), soluble inorganic salt additive is dissolved in clear water in advance, obtains salting liquid；S2, uncrosslinked gel is dissolved in salting liquid, obtains plugging agent.Inorganic salts additive is the mixture of sodium chloride or calcium chloride or both.The method for delaying uncrosslinked gel solution rate of the invention, it can solve to have caused viscous rod climbing phenomenon serious since high-intensitive uncrosslinked gel solution rate is too fast, so that pump note is difficult when injection stratum, the problem of can not injecting, technical support is provided for site operation operability.
Description
Technical field
The present invention relates to oil gas field technical field of chemistry, and in particular to it is a kind of delay it is non-crosslinked solidifying in the plugging agent of oil field
The method of glue solution rate.
Background technique
China begins one's study and applies profile control and water plugging technology from the 1950s, to China's profile control and water plugging during " eight or five "
Technology has become oil field routine yield-increasing technology.China major part oil field comes into the waterflooding extraction later period simultaneously, and water injection well
Novel technique of in-depth profile control and water shutoff in oil well are that water flooding later period stable yields protects production requisite measure, have preferable economic effect
Benefit.
China land oil field largely uses waterflooding extraction, and the water suction of water injection well spike, well water are that oil field is secondary, three times
Common problem in oil recovery process.The main reason is that due to the heterogeneity on primary stratum, long-term injecting water is developed in addition
It is further exacerbated by formation heterogeneity with human factor (such as well stimulation, operation are unsuccessfully), leads to water breakthrough or water logging, makes to fill the water
Well water-injection efficiency is low, and producing well premature water breakthrough, production capacity reduce.Profile control and water plugging technology is followed in vain for oil reservoir water outlet, water drive
One of the efficient increasing yield and injection measure that the problems such as ring is researched and developed.The more frequent plugging agent that each elephant in China uses at present
Mainly gel-like plugging agent achievees the purpose that gel is formed in oil reservoir deep by control gelation time, gelling strength, but
Most of crosslinking agent the problems such as there are toxic contaminants environment, and in gel rubber system injection stratum by shearing, be detained absorption,
Cause the intensity, closure globality, long-time stability of gel rubber system that expected effect is not achieved after chromatographic isolation, water enchroachment (invasion) dilution.
Existing related patents CN106928948A discloses a kind of uncrosslinked gel leak stopping system, including zon-crosslinked polymeric
Object and aqueous solvent；The non-cross-linked polymer is polymerize to obtain by acrylamide, hydrophobic monomer with function monomer.The hydrophobic monomer
Selected from N- alkyl-substituted acrylamide, alkyl acrylate, alkyl methacrylate, fluoroalkyl acrylate, methyl-prop
Olefin(e) acid fluoroalkyl, chain alkyl unsaturated quaternary ammonium salt, alkylallyl sulfonate, alkyl phenol polyoxyethylene ether acrylate
With one of alkyl polyoxyethylene ether acrylate or a variety of.The function monomer is selected from the sulfonic acid containing end alkenyl
And its one of sulfonate derivatives, Hete rocyclic derivatives containing alkenyl ether compound is held and containing end alkenyl or a variety of.
Patent CN106928402A discloses a kind of polymer gel, is formed in water by polymer, the polymer is by acrylamide
Monomer, unsaturated hydrophobic monomer and function monomer are polymerized；The unsaturation hydrophobic monomer is selected from non-ionic unsaturated thin
Aqueous monomer, cationic unsaturation hydrophobic monomer or anionic unsaturation hydrophobic monomer；The non-ionic unsaturation is hydrophobic
It is polyxyethylated that monomer is selected from N- alkyl acrylamide, alkyl acrylate, alkylphenol-polyethenoxy acrylate, acrylic acid
One of ester and alkyl methacrylate are a variety of.The function monomer is selected from sulfonic acid and its sulphur containing alkenyl
One of acid salt derivant, Hete rocyclic derivatives containing alkenyl alkyl ethers and containing alkenyl are a variety of.
Related patents CN106867488A discloses a kind of novel physical crosslinking gel-like profile control and water plugging system, the system
It include host agent and aqueous solvent for unitary system, host agent is non-ionic water-soluble modified polyacrylamide, anionic water solubility
One of modified polyacrylamide, cationic modified polyacrylamide and the water-soluble modified polyacrylamide of amphoteric ion type
Or it is a variety of.The unitary system can form physics space networks by intermolecular force for adjusting stifled aspect to have a clear superiority
The water-soluble polymer of gel or derivatives thereof of shape structure.Uncrosslinked gel dosage is usually 0.3~6% in plugging agent.
The uncrosslinked gel of high concentration is in process for preparation, since swelling time is shorter, significantly viscosifies and climbs in short time gel solution
Bar be easy to cause pump truck to block at the scene in work progress, it is difficult to which continuing will be inside blocking agent sprue bushing.Therefore, it is necessary to use
A method of the solution rate extending high concentration uncrosslinked gel, by blocking agent by pump truck during gel non-complete swelling
It in whole sprue bushings, and then has been completely dissolved has glued in the earth formation, played tune plugging function.
Summary of the invention
Present invention aim to address above-mentioned oil field plugging agent uncrosslinked gel, in process for preparation of constructing at the scene by
The viscous pole-climbing time is too fast in high-intensitive uncrosslinked gel is in course of dissolution, and a few minutes viscosity just increases considerably, and is easy
It causes pump to block, influences the technological deficiency of pump note construction, a kind of uncrosslinked gel dissolution delayed in the plugging agent of oil field is provided
The method of speed.
A kind of claimed soluble inorganic salt is delaying the uncrosslinked gel dissolution speed in the plugging agent of oil field
Application in degree.
A kind of method for delaying the uncrosslinked gel solution rate in the plugging agent of oil field, the party is also claimed in the present invention
Method includes:
The uncrosslinked gel is dissolved in the aqueous solution of soluble inorganic salt.
Specifically, the soluble inorganic salt is selected from least one of sodium chloride and calcium chloride.
More specifically, when the soluble inorganic salt is the mixture being made of sodium chloride and calcium chloride, the sodium chloride
Weight ratio with calcium chloride is 5:1~10:1；Specially 9:1；
When the soluble inorganic salt is sodium chloride, quality hundred of the sodium chloride in the aqueous solution of soluble inorganic salt
Dividing concentration is 5-10%.
Described to delay in step, the soluble inorganic salt exists in form of an aqueous solutions；Soluble inorganic salt it is water-soluble
In liquid, the mass percentage concentration of the soluble inorganic salt is no more than 20%.
The mass percentage concentration of the soluble inorganic salt is specifically no more than 10%.
The mass percentage concentration of the soluble inorganic salt is more specifically 1-10% or 5-10%.
Mass fraction of the calcium chloride in the aqueous solution of soluble inorganic salt is specially 0.1%~2%；The chlorination
Mass fraction of the sodium in the aqueous solution of soluble inorganic salt is 1%~20%；Specially 1-10%.
The uncrosslinked gel is various common uncrosslinked gels, specifically can be selected from non-ionic water-soluble modified polypropene
The water-soluble modified polyacrylamide of amide, anionic, cationic modified polyacrylamide and amphoteric ion type water solubility change
At least one of property polyacrylamide；
Comprising acrylamide monomer units and extremely in the molecular structure of the non-ionic water-soluble modified polyacrylamide
A kind of few non-ionic unsaturated monomer unit；The non-ionic unsaturated monomer unit is by n-vinyl pyrrolidone, horse
Carry out at least one in acid anhydrides, vinyl ethyl ether, N- alkyl-substituted acrylamide, alkyl acrylate and alkyl methacrylate
Kind is formed；The carbon atom number of alkyl in the N- alkyl-substituted acrylamide, alkyl acrylate and alkyl methacrylate
It is each independently 5-20；
Comprising acrylamide monomer units and extremely in the molecular structure of the water-soluble modified polyacrylamide of anionic
A kind of few anionic unsaturated monomer unit；Wherein, the anionic unsaturated monomer is acrylates, methacrylic acid
Salt, alkyl chain carbon atom number be the acrylamide alkyl sulfonic acid of 4-20, acrylamide alkyl sulfonic acid salt, styrene sulfonate with
At least one of 2- acrylamide-2-methyl propane sulfonic salt；
It include acrylamide monomer units and at least one in the molecular structure of the cationic modified polyacrylamide
Cationic unsaturated monomer unit；The cationic unsaturated monomer unit is by acryloyloxyalkyl quaternary ammonium salt, two allyls
Based quaternary ammonium salt, allyl based quaternary ammonium salt, acrylamide alkyl quaternary ammonium salts, vinyl imidazole bi-quaternary ammonium salt, in heterocyclic quaternary ammonium salt extremely
A kind of few formation；The carbon atom number of the chain alkyl of the acrylamide alkyl quaternary ammonium salts is 5-20；
In the molecular structure of the water-soluble modified polyacrylamide of amphoteric ion type comprising acrylamide monomer units and
At least one anionic unsaturated monomer unit and at least one cationic unsaturated monomer unit: where the sun from
Subtype unsaturated monomer is acrylamide alkyl quaternary ammonium salts, diallyl quaternary ammonium, allyl based quaternary ammonium salt, acrylamide alkyl quaternary
At least one of ammonium salt, vinyl imidazole bi-quaternary ammonium salt and heterocyclic quaternary ammonium salt.
The uncrosslinked gel can be more specifically the light Asia intelligent gel of Sichuan Guangya Polymer Chemical Co., Ltd.'s production
Dry powder, product number ZND-5；
The solution rate is the solution rate of the uncrosslinked gel in water；
The mass percentage concentration of the uncrosslinked gel in water is more than or equal to 3%；Specially 3-6%.
The invention has the beneficial effects that:
1) when preparing plugging agent at the construction field (site), uncrosslinked gel can be significantly improved by the way that inorganic salts additive is added
It is swollen the viscous time, will can be swollen the viscous time extended to greater than 2 hours, and effective solution is molten due to high-intensitive uncrosslinked gel
Solution excessive velocities have caused viscous rod climbing phenomenon serious, so that pump note is difficult when injection stratum, it is existing the problem of can not injecting
Smoothly injection plugging agent provides conveniently for field construction.
2) when low concentration (< 10%) additive is added, uncrosslinked gel viscosity is basically unchanged, and it is strong to will not influence gel
Degree.
Specific embodiment
The present invention is further elaborated combined with specific embodiments below, but the present invention is not limited to following embodiments.Institute
State method is conventional method unless otherwise instructed.The raw material can obtain unless otherwise instructed from public commercial source.
Percentage concentration involved in following embodiments is mass percentage concentration.Uncrosslinked gel used in following embodiments is that Sichuan light is sub-
The light Asia intelligent gel dry powder of polymer Chemical Co., Ltd. production, product number ZND-5.
Embodiment 1
(1) uncrosslinked gel is added in clear water to the uncrosslinked gel solution for being configured to mass percentage concentration 3%, is measured molten
The swelling of liquid plays viscous time and viscosity number.
(2) sodium chloride is dissolved in clear water, be made into respectively mass percentage concentration be 0.5%, 1%, 1.5%, 2%, 5%,
Then 10% salting liquid uncrosslinked gel is added into each concentration salting liquid and is configured to the non-crosslinked of mass percentage concentration 3%
Gel solution, the swelling for measuring solution play viscous time and viscosity number.
(3) sodium chloride and calcium chloride 9:1 in mass ratio are dissolved in clear water, are made into sodium chloride and calcium chloride gross mass respectively
Then the salting liquid that percentage concentration is 0.5%, 1%, 2%, 5%, 10% uncrosslinked gel is added into each concentration salting liquid and matches
The uncrosslinked gel solution of mass percentage concentration 3% is made, the swelling for measuring solution plays viscous time and viscosity number.
Measurement result is shown in Table 1.
The influence of table 1, inorganic additives to uncrosslinked gel solution rate in water
As can be seen from Table 1, under the conditions of not adding the clear water of inorganic salts, the uncrosslinked gel of concentration 3% has been swollen viscous
Time is 5min, this glues the time too short site operation that is not able to satisfy with liquid requirement, cause pump to block, can not pump injection stratum.
Inorganic salts additive is added and can significantly improve uncrosslinked gel and be swollen and glues the time.It can when NaCl concentration 5%
45min is extended to so that the viscous time will be played, and when NaCl concentration 10% can will play the viscous time and extend to 70min.
NaCl and MgCl2Total concentration 5% when uncrosslinked gel can be swollen to the viscous time extend to 50min, NaCl
And MgCl2Total concentration 10% when uncrosslinked gel can be swollen to the viscous time extend to 80min, meet live liquid preparation time
It is required that.And uncrosslinked gel viscosity is basically unchanged when low concentration inorganic additives (< 10%) is added, and will not influence gel
Intensity, more than uncrosslinked gel viscosity decline 10% after 10% inorganic additives, slightly influence intensity.
Embodiment 2
Certain oil field 40-6-3 and 38-9 well belong to typical complex fault block type oil reservoir, and bad break is more, casing leakage, set damage,
Set becomes and the broken well of set is more, which ground often occurs and emit water accident, causes wetland and farmland, villages and small towns, farm's pollution.It is high
Strata pressure caused by injection-production ratio is higher, and old well is thrown aside older in addition, and earth's surface can not search former well head after restoring, the leakage of set damage set,
The factors such as pipe is outer to alter, fault block are all potential factors, so that many difficult points occur in the treatment measures of such accident.Using each
Kind blocking agent administers ground channeling water problem, all ends in failure, such as: grout off (near wellbore zone closure), chemical crosslinking gel
Block (stratum gel-forming property and block-up position uncontrollability), walnut shell rubber powder inorganic material block (near wellbore zone closure),
Volume expansion grain (blocks not whole).
Construction method: construction site, it is ready-to-use, the mixing salt solution of sodium chloride and calcium chloride is prepared using clear water,
Mass percentage concentration of the middle sodium chloride in mixing salt solution is 5%, mass percentage concentration of the calcium chloride in mixing salt solution
It is 1%, uncrosslinked gel is added in salting liquid, uncrosslinked gel concentration 1.5~3%, it will using conventional skid profile control device
Uncrosslinked gel solution smoothly injects stratum.40-6-3 well injects uncrosslinked gel solution 2000m3, 38-9 well injects non-crosslinked
Gel solution 2200m3。
For the channel for channeling to ground on oil gas, by previous way, often takes injection well to stop to infuse for a long time or shunt in a well, beat
Disorderly original exploitation flooding pattern, is unfavorable for oil field sustainable development, very big influence is brought to oil well production, the technology at
Function apply for so-and-so entire oil field it is previous emit water because of ground caused by stop to infuse or shunt in a well for a long time, opened up a new way, former 2 emit
Mud point stops 17 mouthfuls of injection well of note altogether, influences 14.156 × 104m of injection rate3, corresponding 26 mouthfuls of oil well, injection well is restored after measure
Injection, ground emit water stopping, and well group increases oil, and realize economic benefit and social benefit bumper harvests.
Embodiment 3
So-and-so oil field environment-protection is administered: so-and-so oil field due to early stage cementing quality is poor, cement return it is high it is inadequate, casing material is poor,
In addition the development time is up to 40 years or more, and casing corrosion perforation rupture is more, and the high gassiness pressure coefficient of in-place oil is high, high-pressure spray
Body scurries into leak source by cement annular space, is scurrying into earth's surface undercompacted formation, is leading to ground blowby, influence environmental issue, it is proposed that is right
The wellblock underground leak source is blocked, and guarantees that oil field opens and environmental protection.
Work progress are as follows: play flow string, drifting, well-flushing, lower operating tool string, pressure testing, construction equipment are marched into the arena, construction material
Admission, construction start.Arrangement and method for construction: using plugging agent uncrosslinked gel solution as preposed attributives, being then injected into cement slug,
Preposed attributives solution preparation method: mixing salt solution of the preparation containing sodium chloride and calcium chloride first, wherein sodium chloride is mixing
Mass percentage concentration 10% in salting liquid, mass percentage concentration 1% of the calcium chloride in mixing salt solution；Then to salting liquid
The middle uncrosslinked gel solution that uncrosslinked gel is added and is configured to concentration 2~6%, so that uncrosslinked gel swelling time extends to
After 2 hours, preposed attributives are smoothly injected into stratum, being formed has certain plugging strength, provides one for subsequent grout off slug
Determine bearing capacity, so that cement slug is effectively rested on cement sheath stratum nearby, increase working security and successful.Construction knot
Shu Hou, pressure testing 8MPa, pressure stabilizing is qualified, successfully blocks so-and-so oil field ground blowby leak source, solves environmental issue caused by blowby.
In conclusion the present invention is constructed in process for preparation with plugging agent uncrosslinked gel due to high-strength at the scene for oil field
The uncrosslinked gel of degree plays that the viscous pole-climbing time is too fast, and a few minutes viscosity just increases considerably in course of dissolution, be easy to cause pump
Blocking, influences pump note construction, this site operation defect provides a kind of side of solution rate that can delay uncrosslinked gel
Method delays the solution rate of uncrosslinked gel in water by the way that inorganic salts additive is added, uncrosslinked gel has been swollen viscous
Time extends to greater than 2h, and plugging agent is smoothly injected for site operation and is provided conveniently.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. soluble inorganic salt is delaying the application in the uncrosslinked gel solution rate in the plugging agent of oil field.
2. a kind of method for delaying the uncrosslinked gel solution rate in the plugging agent of oil field, comprising:
The uncrosslinked gel is dissolved in the aqueous solution of soluble inorganic salt.
3. application according to claim 1 or method as claimed in claim 2, it is characterised in that: the soluble inorganic
Salt is selected from least one of sodium chloride and calcium chloride.
4. application or method described in -3 according to claim 1, it is characterised in that: the soluble inorganic salt is by sodium chloride
When the mixture formed with calcium chloride, the weight ratio of the sodium chloride and calcium chloride is 5:1~10:1；Specially 9:1；
When the soluble inorganic salt is sodium chloride, quality percentage of the sodium chloride in the aqueous solution of soluble inorganic salt is dense
Degree is 5-10%.
5. application according to any one of claims 1-4 or method, it is characterised in that: it is described to delay in step, it is described can
Soluble inorganic salt exists in form of an aqueous solutions；In the aqueous solution of soluble inorganic salt, the quality hundred of the soluble inorganic salt
Concentration is divided to be no more than 20%.
6. application according to claim 5 or method, it is characterised in that: the mass percentage concentration of the soluble inorganic salt
No more than 10%.
7. application according to claim 6 or method, it is characterised in that: the mass percentage concentration of the soluble inorganic salt
For 1-10% or 5-10%.
8. application according to claim 7 or method, it is characterised in that: the calcium chloride is in the water-soluble of soluble inorganic salt
Mass fraction in liquid is 0.1%~2%；Mass fraction of the sodium chloride in the aqueous solution of soluble inorganic salt is 1%
~20%；Specially 1-10%.
9. any application or method in -8 according to claim 1, it is characterised in that: the uncrosslinked gel be selected from it is non-from
The water-soluble modified polyacrylamide of subtype, the water-soluble modified polyacrylamide of anionic, cationic modified polyacrylamide
At least one of with the water-soluble modified polyacrylamide of amphoteric ion type；
It include acrylamide monomer units and at least one in the molecular structure of the non-ionic water-soluble modified polyacrylamide
The non-ionic unsaturated monomer unit of kind；The non-ionic unsaturated monomer unit is by n-vinyl pyrrolidone, maleic acid
At least one of acid anhydride, vinyl ethyl ether, N- alkyl-substituted acrylamide, alkyl acrylate and alkyl methacrylate shape
At；The carbon atom number of alkyl is respectively in the N- alkyl-substituted acrylamide, alkyl acrylate and alkyl methacrylate
It independently is 5-20；
It include acrylamide monomer units and at least one in the molecular structure of the water-soluble modified polyacrylamide of anionic
Kind anionic unsaturated monomer unit；Wherein, the anionic unsaturated monomer be acrylates, methacrylate,
Alkyl chain carbon atom number is acrylamide alkyl sulfonic acid, acrylamide alkyl sulfonic acid salt, styrene sulfonate and the 2- of 4-20
At least one of acrylamide-2-methyl propane sulfonic salt；
In the molecular structure of the cationic modified polyacrylamide comprising acrylamide monomer units and at least one sun from
Subtype unsaturated monomer unit；The cationic unsaturated monomer unit is by acryloyloxyalkyl quaternary ammonium salt, diallyl season
Ammonium salt, allyl based quaternary ammonium salt, acrylamide alkyl quaternary ammonium salts, vinyl imidazole bi-quaternary ammonium salt, at least one in heterocyclic quaternary ammonium salt
Kind is formed；The carbon atom number of the chain alkyl of the acrylamide alkyl quaternary ammonium salts is 5-20；
Comprising acrylamide monomer units and at least in the molecular structure of the water-soluble modified polyacrylamide of amphoteric ion type
A kind of anionic unsaturated monomer unit and at least one cationic unsaturated monomer unit: where the cationic
Unsaturated monomer is acrylamide alkyl quaternary ammonium salts, diallyl quaternary ammonium, allyl based quaternary ammonium salt, acrylamide quaternary ammonium alkyl
At least one of salt, vinyl imidazole bi-quaternary ammonium salt and heterocyclic quaternary ammonium salt.
10. any application or method in -9 according to claim 1, it is characterised in that: the solution rate is described non-
The solution rate of cross-linked gel in water；
The mass percentage concentration of the uncrosslinked gel in water is more than or equal to 3%；Specially 3-6%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110205109A (en) * | 2019-07-10 | 2019-09-06 | 中海石油(中国)有限公司秦皇岛32-6作业公司 | A kind of low-viscosity gel water shutoff agent of resisting high temperature, high salt |
| CN112480317A (en) * | 2019-09-12 | 2021-03-12 | 中国石油天然气股份有限公司 | Gel plugging material and preparation method thereof |
| CN114574180A (en) * | 2022-03-25 | 2022-06-03 | 西南石油大学 | Delayed-gelling composite leakage-stopping liquid and preparation method thereof |
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| CN114574180A (en) * | 2022-03-25 | 2022-06-03 | 西南石油大学 | Delayed-gelling composite leakage-stopping liquid and preparation method thereof |
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