CN106632840A - Phase permeability modifier for oilfield fracturing and preparation method thereof - Google Patents
Phase permeability modifier for oilfield fracturing and preparation method thereof Download PDFInfo
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- CN106632840A CN106632840A CN201611117599.2A CN201611117599A CN106632840A CN 106632840 A CN106632840 A CN 106632840A CN 201611117599 A CN201611117599 A CN 201611117599A CN 106632840 A CN106632840 A CN 106632840A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
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Abstract
The invention relates to the technical field of oilfield fracturing fluid additives, and discloses a phase permeability modifier for oilfield fracturing and a preparation method thereof. The phase permeability modifier for oilfield fracturing is prepared from the following raw materials: an emulsifying agent, diesel oil, an initiator, a polymeric monomer and water. A reservoir or middle and high water cut oilfields with complicated oil-water relationships can realize the effects of reducing the oil well water yield, improving the oil pump capacity and achieving water control and oil increase, so that the productivity of oil is improved; the phase permeability modifier is a long-chain high-molecular polymer, can effectively increase the water-phase permeability, is little in influence on oil-phase permeability, and has high selectivity water control performance; besides, the phase permeability modifier has high back-displacement performance and relatively high adsorption capacity; compared with the prior art, the drag reduction phase permeability modification performance is more excellent, and the oil well yield can be increased by more than 10%; and moreover, the phase permeability modifier is simple in production and loose in using condition, so that the phase permeability modifier can be widely applied to fracturing production increasing technique of oil-water layer reservoir phase permeability fracturing.
Description
Technical field
The present invention relates to oil field fracturing fluid additive technology field, is a kind of oil field compression fracture relative permeability modifier and its preparation
Method.
Background technology
Oil field compression fracture is exactly to utilize hydraulic action（Fracturing fluid is injected toward Oil/gas Well and high pressure is formed）, form oil reservoir and split
A kind of method of seam, also known as oil formation hydraulic fracturing, hydraulic fracturing is that at present each oil gas field uses reservoir reconstruction skill the most ripe
Art, during the oil reservoir of exploitation oil-water common-layer, water yield is too high, the very few always problem demanding prompt solution of oil pump capacity,
With the needs of development and the application of science and technology, during developing new pressure break, control hydraulic pressure splits and become multiple fields
The problem of concern.Relative permeability modifier is the main additive for mutually oozing fracturing fluid, and it is mutually to ooze in pressing crack construction most mutually to ooze fracturing fluid
Main liquid system.It is at the early-stage that fracturing technique is mutually oozed in China, it is external also have at present mutually oozes fracturing fluid technology, but it is existing
In technology, the effect for mutually oozing regulation is still satisfied with not to the utmost.
The content of the invention
The invention provides a kind of oil field compression fracture relative permeability modifier and preparation method thereof, overcome above-mentioned prior art it
Deficiency, its energy effectively solving phase of the prior art oozes the undesirable problem of regulating effect.
One of technical scheme is realized by following measures：A kind of oil field compression fracture relative permeability modifier,
Raw material includes 1% to 4% emulsifying agent, 8% to 10% diesel oil, the polymerized monomer of 0.07% to 0.2% initiator and surplus and remaining
The water of amount, wherein, the weight ratio of polymerized monomer and water is 5:2 to 45:7.
The further optimization and/or improvements to one of foregoing invention technical scheme are presented herein below：
Above-mentioned polymerized monomer be acrylamide, 2- acrylamide-2-methyl propane sulfonics, N,N-DMAA by weight
3 to 4：6 to 7：2 to 3 mixtures for mixing；Or/and, emulsifying agent is sorbester p17 and Tween 80 by weight 3 to 4:7 to 9
The mixture for mixing；Or/and, diesel oil is No. 0 diesel oil；Or/and, initiator is ammonium persulfate.
Above-mentioned oil field compression fracture relative permeability modifier is obtained as follows：The first step, the preparation of water phase：By polymerized monomer plus
Enter in water and be uniformly mixed, until polymerized monomer is completely dissolved in water, obtain aqueous phase solution；Second step, oil phase
Prepare：Diesel oil and emulsifying agent are blended in into one under conditions of inert gas starvation, temperature is persistently led to for 30 DEG C to 35 DEG C
Rise and be uniformly mixed and obtain oil phase material；3rd step, polymerisation：It is inert gas starvation, temperature is persistently led to
Aqueous phase solution is added in oil phase material under conditions of 30 DEG C to 35 DEG C, being well mixed under rear stirring carries out 25 points of emulsification
Material was warming up to 40 DEG C to 50 DEG C by clock to 40 minutes after emulsification, then in material add initiator after under stirring
Carry out polymerisation 4 hours to 6 hours.
In the above-mentioned first step, the pH value of aqueous phase solution is tuned into 8 to 9 with pH adjusting agent.
Above-mentioned pH adjusting agent is sodium hydroxide solution.
In above-mentioned 3rd step, emulsified under conditions of speed of agitator is for 500 revs/min to 800 revs/min；Or/
With, in the 3rd step, speed of agitator be 200 revs/min to 400 revs/min under conditions of carry out polymerisation；Or/and, inertia
Gas is nitrogen.
The two of technical scheme are realized by following measures：A kind of oil according to technical scheme one
The preparation method of field pressure break relative permeability modifier, is carried out in the steps below：The first step, the preparation of water phase：Polymerized monomer is added
To in water and it is uniformly mixed, until polymerized monomer is completely dissolved in water, obtains aqueous phase solution；Second step, oil phase is matched somebody with somebody
System：Diesel oil and emulsifying agent are mixed under conditions of inert gas starvation, temperature is persistently led to for 30 DEG C to 35 DEG C
And be uniformly mixed and obtain oil phase material；3rd step, polymerisation：It is 30 inert gas starvation, temperature is persistently led to
DEG C aqueous phase solution is added in oil phase material under conditions of 35 DEG C, being well mixed under rear stirring carries out emulsification 25 minutes
To 40 minutes, material is warming up into 40 DEG C to 50 DEG C after emulsification, then adds to enter under stirring after initiator in material
Row polymerisation 4 hours to 6 hours.
To foregoing invention technical scheme two further optimization and/or improvements are presented herein below：
In the above-mentioned first step, the pH value of aqueous phase solution is tuned into 8 to 9 with pH adjusting agent.
Above-mentioned pH adjusting agent is sodium hydroxide solution.
In above-mentioned 3rd step, emulsified under conditions of speed of agitator is for 500 revs/min to 800 revs/min；Or/
With, in the 3rd step, speed of agitator be 200 revs/min to 400 revs/min under conditions of carry out polymerisation；Or/and, inertia
Gas is nitrogen.
The present invention is directed to the complicated reservoir of oil water relation or high water cut rate oil field, can realize reducing well water
Amount, improve oil pump capacity, reach the effect of " water-control oil-increasing ", so as to improve tar productivity, the oil field compression fracture of the present invention is with mutually oozing regulation
Agent is long chain macromolecule polymer, can be effectively increased water phase permeability, affect little to oleic permeability, with excellent selection
Property the aqueous energy of control, meanwhile, the present invention is functional with the good row of returning, and possesses stronger adsorption capacity, compared to existing
For technology, it is more superior that drag reduction mutually oozes regulation performance, by increasing capacitance it is possible to increase oil well output more than 10%, also, the production technology of the present invention
Simply, use condition is loose, therefore, it is possible to be widely used in the fracturing yield increasing technology that oil-water common-layer reservoir phase osmotic pressure splits.
Specific embodiment
The present invention is not limited by following embodiments, can technology according to the present invention scheme and actual conditions determining specifically
Embodiment.Various chemical reagent and chemical article are previously mentioned in the present invention if no special instructions, are known in existing technology
Public chemical reagent and chemical article；Percentage in the present invention is as without specified otherwise, being mass percent；The present invention
In water as being running water or pure water without specified otherwise；If without specified otherwise, be solvent is the solution in the present invention
The aqueous solution of water, for example, hydrochloric acid solution is aqueous hydrochloric acid solution；Normal temperature in the present invention refers generally to 15 DEG C to 25 DEG C of temperature,
It is commonly defined as 25 DEG C.
With reference to embodiment, the invention will be further described：
Embodiment 1, the raw material of the oil field compression fracture relative permeability modifier include 1% to 4% emulsifying agent, 8% to 10% diesel oil,
The water of 0.07% to 0.2% initiator and the polymerized monomer of surplus and surplus, wherein, the weight ratio of polymerized monomer and water is 5:
2 to 45:7.
Embodiment 2, the raw material of the oil field compression fracture relative permeability modifier include 1% or 4% emulsifying agent, 8% or 10% diesel oil,
The water of 0.07% or 0.2% initiator and the polymerized monomer of surplus and surplus, wherein, the weight ratio of polymerized monomer and water is 5:
2 or 45:7.
Embodiment 3, used as the optimization of embodiment 1 and embodiment 2, polymerized monomer is acrylamide, 2- acrylamide -2- first
Base propane sulfonic acid, N,N-DMAA are by weight 3 to 4：6 to 7：2 to 3 mixtures for mixing；Or/and, emulsification
Agent is sorbester p17 and Tween 80 by weight 3 to 4:7 to 9 mixtures for mixing；Or/and, diesel oil is No. 0 diesel oil；Or/
With initiator is ammonium persulfate.
Embodiment 4, used as embodiment 1, the optimization of embodiment 2 and embodiment 3, the oil field compression fracture is pressed with relative permeability modifier
State preparation method to obtain：The first step, the preparation of water phase：Polymerized monomer is added to the water and is uniformly mixed, until polymerization
Monomer is completely dissolved in water, obtains aqueous phase solution；Second step, the preparation of oil phase：Persistently leading to inert gas starvation, temperature
Spend and obtain oil phase material under conditions of 30 DEG C to 35 DEG C diesel oil and emulsifying agent to be mixed and being uniformly mixed；3rd
Step, polymerisation：Aqueous phase solution is added under conditions of inert gas starvation, temperature is persistently led to for 30 DEG C to 35 DEG C
In oil phase material, being well mixed under rear stirring carries out emulsification 25 minutes to 40 minutes, and material is warming up into 40 DEG C after emulsification
To 50 DEG C, then add in material after initiator carries out polymerisation 4 hours to 6 hours under stirring.
Embodiment 5, used as embodiment 1, the optimization of embodiment 2 and embodiment 3, the oil field compression fracture is pressed with relative permeability modifier
State preparation method to obtain：The first step, the preparation of water phase：Polymerized monomer is added to the water and is uniformly mixed, until polymerization
Monomer is completely dissolved in water, obtains aqueous phase solution；Second step, the preparation of oil phase：Persistently leading to inert gas starvation, temperature
Spend and obtain oil phase material under conditions of 30 DEG C or 35 DEG C diesel oil and emulsifying agent to be mixed and being uniformly mixed；3rd
Step, polymerisation：Aqueous phase solution is added under conditions of inert gas starvation, temperature is persistently led to for 30 DEG C or 35 DEG C
In oil phase material, being well mixed under rear stirring carries out emulsification 25 minutes or 40 minutes, and material is warming up into 40 DEG C after emulsification
Or 50 DEG C, then add in material after initiator carries out polymerisation 4 hours or 6 hours under stirring.
The production method of the present invention is simple, operates convenient to carry out.
Embodiment 6, as the optimization of embodiment 4 and embodiment 5, in the first step, with pH adjusting agent by the pH of aqueous phase solution
Value is tuned into 8 to 9.
Embodiment 7, used as the optimization of embodiment 4, embodiment 5 and embodiment 6, pH adjusting agent is sodium hydroxide solution.
Embodiment 8, as the optimization of embodiment 4, embodiment 5, embodiment 6 and embodiment 7, in the 3rd step, turns in stirring
Speed is to be emulsified under conditions of 500 revs/min to 800 revs/min；Or/and, in the 3rd step, speed of agitator be 200 turns/
Minute carries out polymerisation under conditions of 400 revs/min；Or/and, inert gas is nitrogen.
Embodiment 9, the oil field compression fracture relative permeability modifier is obtained by following preparation methods：The first step, the preparation of water phase：
Acrylamide, the 2- acrylamide-2-methyl propane sulfonics of 369g, the N of 109.7g of 179.5g are sequentially added in the water of 250mL,
N- DMAAs, stir to being completely dissolved and obtain aqueous phase solution, add 0.3g NaOH to adjust the pH of aqueous phase solution
For 8 to 9；Second step, the preparation of oil phase：Weigh diesel oil, the sorbester p17 of 5g, the Tween 80 of 15g of 90g, maintaining nitrogen purge every
Anoxybiotic gas, temperature be 35 DEG C under conditions of diesel oil, sorbester p17 and Tween 80 are mixed and stirred for uniformly to obtain oil phase material；3rd
Step, is added to aqueous phase solution in oil phase material under conditions of maintaining nitrogen purge starvation, temperature are for 35 DEG C, is well mixed
Carry out emulsification 30 minutes under the stirring that rotating speed is 600 revs/min afterwards, material is warming up into 45 DEG C after emulsification, Ran Houxiang
Polymerisation is carried out after the ammonium persulfate that 1.5g is added in material 6 hours under the stirring that rotating speed is 300 revs/min.
The oil field fracturing fluid for obtaining according to embodiments of the present invention is carried out into the measure of product performance index with relative permeability modifier：
（1）Molecular weight determination：Using the system combined multi-angle laser light scattering apparatus of gel chromatography.Sample concentration is 5%, determines product
Molecular weight.
（2）The oil phase infiltration reduced rate for mutually oozing regulation of immersion 5%：ULTRAPERM-500 type drill core permeability rate automatic measurements
Instrument.
（3）The water phase permeability for mutually oozing regulation of immersion 5%：ULTRAPERM-500 type drill core permeability rate automatic measuring instruments.
（4）After the relative permeability modifier of coring immersion 5%, with stratum water back flush, survey its water mutually permeate reduced rate with
The change of time, the results are shown in Table 1.
Properties of product measurement result：
（1）The molecular weight of the oil field fracturing fluid relative permeability modifier for obtaining according to embodiments of the present invention is 800,000 to 1,400,000, and number is equal
Molecular weight is 1,380,000；
（2）The oil phase infiltration reduced rate for mutually oozing regulation of immersion 5%：Less than 4%；
（3）The water for mutually oozing regulation of immersion 5% mutually permeates reduced rate：65% to 72%.
The oil field compression fracture relative permeability modifier of the present invention is long chain macromolecule polymer, can be effectively increased water and mutually permeate
Rate, oleic permeability is not affected, and in prior art, it is external：Such as Halliburton Company is adopted with hydrophobically modified polymers
Based on relative permeability modifier, research shows that its water mutually permeates reduced rate and is up to 70%, and oil phase infiltration reduced rate minimum is not less than
5%；It is domestic：There are Preliminary Applications the oil recovery factory of Changqing oilfields first in Ansai Oilfield, Wen-Mi oil field, and theirs mutually oozes in regulation technology
Water mutually permeates reduced rate and is up to 50%, and oil phase infiltration reduced rate minimum is not less than 7%.
（4）The backwash with landing surface water is can be seen that by data in table 1, water mutually permeates reduced rate and finally maintains
67.67%, no longer reduce with the increase of washing time, illustrate the oil field fracturing fluid phase for obtaining according to embodiments of the present invention
Ooze conditioning agent and possess preferable adsorption capacity.
The present invention is directed to the complicated reservoir of oil water relation or high water cut rate oil field, can realize reducing well water
Amount, the effect for improving oil pump capacity, reaching " water-control oil-increasing ", so as to improve tar productivity.The oil field compression fracture of the present invention is with mutually oozing regulation
Agent is long chain macromolecule polymer, can be effectively increased water phase permeability, affect little to oleic permeability, illustrates selective control water
Function admirable, meanwhile, the surface tension of oil field compression fracture relative permeability modifier of the present invention is less than 25mNm, and interfacial tension is less than
3mNm, the oil field compression fracture for embodying the present invention is low with relative permeability modifier surface and interface tension force, illustrates the oil field compression fracture phase of the present invention
Ooze conditioning agent and there is the good row's of returning performance, and possess stronger adsorption capacity, for prior art, drag reduction mutually oozes tune
Section performance is more superior, by increasing capacitance it is possible to increase oil well output more than 10%, also, the simple production process of the present invention, and use condition is loose,
Therefore, it is possible to be widely used in the fracturing yield increasing technology that oil-water common-layer reservoir phase osmotic pressure splits.
Above technical characteristic constitutes embodiments of the invention, and it has stronger adaptability and implementation result, can basis
It is actually needed the non-essential technical characteristic of increase and decrease to meet the demand of different situations.
Claims (10)
1. a kind of oil field compression fracture relative permeability modifier, it is characterised in that raw material includes 1% to 4% emulsifying agent, 8% to 10% bavin
The water of oil, 0.07% to 0.2% initiator and the polymerized monomer of surplus and surplus, wherein, the weight ratio of polymerized monomer and water
For 5:2 to 45:7.
2. oil field compression fracture relative permeability modifier according to claim 1, it is characterised in that polymerized monomer is acrylamide, 2-
Acrylamide-2-methyl propane sulfonic, N,N-DMAA are by weight 3 to 4：6 to 7：2 to 3 mixing for mixing
Thing；Or/and, emulsifying agent is sorbester p17 and Tween 80 by weight 3 to 4:7 to 9 mixtures for mixing；Or/and, diesel oil is
No. 0 diesel oil；Or/and, initiator is ammonium persulfate.
3. oil field compression fracture relative permeability modifier according to claim 2, it is characterised in that obtain as follows：First
Step, the preparation of water phase：Polymerized monomer is added to the water and is uniformly mixed, until polymerized monomer is completely dissolved in water,
Obtain aqueous phase solution；Second step, the preparation of oil phase：Persistently leading to inert gas starvation, the bar that temperature is 30 DEG C to 35 DEG C
Under part diesel oil and emulsifying agent are mixed and is uniformly mixed and obtain oil phase material；3rd step, polymerisation：Continuing
Logical inert gas starvation, temperature are to be added to aqueous phase solution in oil phase material under conditions of 30 DEG C to 35 DEG C, and mixing is equal
Emulsification 25 minutes to 40 minutes is carried out under even rear stirring, material 40 DEG C to 50 DEG C is warming up into after emulsification, then to material
Polymerisation is carried out after middle addition initiator 4 hours to 6 hours under stirring.
4. oil field compression fracture relative permeability modifier according to claim 3, it is characterised in that in the first step, will with pH adjusting agent
The pH value of aqueous phase solution is tuned into 8 to 9.
5. oil field compression fracture relative permeability modifier according to claim 4, it is characterised in that pH adjusting agent is that NaOH is molten
Liquid.
6. the oil field compression fracture relative permeability modifier according to claim 3 or 4 or 5, it is characterised in that in the 3rd step, in stirring
Rotating speed be 500 revs/min to 800 revs/min under conditions of emulsified；Or/and, it is 200 in speed of agitator in the 3rd step
Rev/min carry out polymerisation under conditions of 400 revs/min；Or/and, inert gas is nitrogen.
7. a kind of preparation method of oil field compression fracture relative permeability modifier according to claim 1 and 2, it is characterised in that press
Stating step is carried out：The first step, the preparation of water phase：Polymerized monomer is added to the water and is uniformly mixed, until polymerized monomer
It is completely dissolved in water, obtains aqueous phase solution；Second step, the preparation of oil phase：It is inert gas starvation, temperature is persistently led to
Under conditions of 30 DEG C to 35 DEG C diesel oil and emulsifying agent are mixed and is uniformly mixed and obtain oil phase material；3rd step,
Polymerisation：Aqueous phase solution is added into oil under conditions of inert gas starvation, temperature is persistently led to for 30 DEG C to 35 DEG C
In phase materials, being well mixed under rear stirring carries out emulsification 25 minutes to 40 minutes, and material is warming up into 40 DEG C extremely after emulsification
50 DEG C, then add in material after initiator carries out polymerisation 4 hours to 6 hours under stirring.
8. the preparation method of oil field compression fracture relative permeability modifier according to claim 7, it is characterised in that in the first step, uses
The pH value of aqueous phase solution is tuned into 8 to 9 by pH adjusting agent.
9. the preparation method of oil field compression fracture relative permeability modifier according to claim 8, it is characterised in that pH adjusting agent is
Sodium hydroxide solution.
10. the preparation method of the oil field compression fracture relative permeability modifier according to claim 7 or 8 or 9, it is characterised in that the 3rd
In step, emulsified under conditions of speed of agitator is for 500 revs/min to 800 revs/min；Or/and, in the 3rd step, in stirring
Rotating speed be 200 revs/min to 400 revs/min under conditions of carry out polymerisation；Or/and, inert gas is nitrogen.
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| CN106008803A (en) * | 2016-05-26 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | High temperature resistant cross-linked acid thickening agent and preparation method thereof |
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| CN109762543A (en) * | 2019-02-20 | 2019-05-17 | 中国石油大学(华东) | A kind of heat-resistant salt-resistant is from Tackified emulsion work-in-progress control diversion agent and preparation method thereof |
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