CN110105940B - Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction - Google Patents

Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction Download PDF

Info

Publication number
CN110105940B
CN110105940B CN201910520883.1A CN201910520883A CN110105940B CN 110105940 B CN110105940 B CN 110105940B CN 201910520883 A CN201910520883 A CN 201910520883A CN 110105940 B CN110105940 B CN 110105940B
Authority
CN
China
Prior art keywords
water
profile control
sodium bentonite
multipolymer
control agent
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.)
Active
Application number
CN201910520883.1A
Other languages
Chinese (zh)
Other versions
CN110105940A (en
Inventor
肖扬
郭晓顺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heilongjiang Yongfeng Chemical Additive Co ltd
Original Assignee
Heilongjiang Yongfeng Chemical Additive Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heilongjiang Yongfeng Chemical Additive Co ltd filed Critical Heilongjiang Yongfeng Chemical Additive Co ltd
Priority to CN201910520883.1A priority Critical patent/CN110105940B/en
Publication of CN110105940A publication Critical patent/CN110105940A/en
Application granted granted Critical
Publication of CN110105940B publication Critical patent/CN110105940B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • 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
    • C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • 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
    • C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

The invention discloses a multipolymer elastic particle profile control agent for oil field chemical oil extraction, which belongs to the field of oil field chemistry and comprises the following raw materials: reaction monomer, cross-linking agent, assistant, initiator and water. The invention has certain elasticity, strength and water retention performance, and has the advantages of simple preparation, good temperature resistance and salt resistance, convenient construction, little pollution to non-target layers and the like; the special chemical structure and the net structure in the polymer particle molecule enable the water absorption mode of the polymer particle to have physical adsorption, chemical adsorption and network adsorption, so that the polymer particle has strong water absorption expansion capacity; more importantly, the pre-crosslinked particle gel after water swelling can generate reversible deformation under the action of external force, and the deformation can be recovered to a certain extent when the external force is reduced; therefore, the characteristics can be fully utilized in the deep profile control and the oil reservoir pressure field change is combined, the deep fluid steering is realized, and the sweep efficiency is improved.

Description

Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction
Technical Field
The invention belongs to the field of oilfield chemistry, and particularly relates to a multipolymer elastic particle profile control agent for oilfield chemical oil extraction.
Background
In the process of crude oil exploitation, water is generally injected into an oil layer to keep the energy of the oil layer for crude oil exploitation, and because the oil layer has heterogeneity and poor oil-water existence degree, water injected into the oil layer is unevenly pushed along the oil layer with high-permeability large pore canals, so that the injected water quickly breaks through the oil layer, the injected water fluctuation degree and the water displacement efficiency of a medium-low permeable layer are reduced, the water content of the oil well rapidly rises, and the water injection development effect is seriously influenced. A large number of researches and application practices show that effective chemical profile control agents are selected and profile control operation is carried out in water injection wells to plug high-permeability large pore passages between injection wells and production wells, and the method plays an important role in continuous and stable yield of high-water-content oil reservoirs.
At present, the profile control agent used in the oil field is more than hundreds of types, and has certain profile control and water shutoff effects. However, these profile control agents suffer from certain performance shortcomings due to differences in reservoir conditions, geological characteristics and fluid properties: if the gel profile control agent which is common in the oil field is used at present, the temperature resistance and salt resistance are poor, and the gelling performance is poor even no gelling is generated in the highly mineralized oil field water; under the condition of high-temperature oil reservoir, the gel forming time is short, or the formed gel breaks rapidly and loses the profile control effect. For example, the existing bulk-expanded particle profile control agent used in the oil field site has the defects of higher water absorption speed and expansion speed during on-site profile control construction, easy accumulation in a near-wellbore area, easy breakage even blocking of a construction pipe column under formation pressure, poor salt resistance and temperature resistance, easy influence of high formation shear force, low water absorption rate in high-salinity oil field water, low strength after water expansion, poor elasticity and poor profile control effect.
In order to solve the problems of the field profile control agent, it is necessary to develop a new particle profile control agent based on the existing results of the former people, so as to better improve the development effect of the water-drive reservoir.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a multipolymer elastic particle profile control agent for oilfield chemical oil extraction, which has the characteristics of temperature resistance, salt resistance, high compressive strength and flexible gel.
A multipolymer elastic particle profile control agent for oil field chemical oil extraction comprises the following raw materials: reaction monomer, cross-linking agent, assistant, initiator and water.
Preferably, the multipolymer elastic particle profile control agent for oil field chemical oil extraction comprises the following raw materials in parts by weight: 45-60 parts of reaction monomer, 0.04-0.1 part of cross-linking agent, 7.5-10 parts of auxiliary agent, 0.04-0.1 part of initiator and 30-55 parts of water.
The reaction monomer at least contains-COOH or-CONH2The olefinic compounds of (1).
Preferably, the reactive monomer is selected from one or more of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid sodium salt, methacrylamide, sodium allylsulfonate, 2-dimethyl-7-octenoic acid, and N-methacryl-1-aziridinecarboxamide.
Further preferably, the reaction monomer consists of 2, 2-dimethyl-7-octenoic acid, sodium 2-acrylamido-2-methylpropanesulfonate and N-methacryl-1-aziridinecarboxamide; the molar ratio of the 2, 2-dimethyl-7-octenoic acid to the sodium 2-acrylamido-2-methylpropanesulfonate to the N-methacryl-1-aziridinecarboxamide is 1: (0.1-0.3): (0.6-0.9).
The auxiliary agent is selected from one or more of sodium bentonite substances, modified starch and carboxymethyl cellulose.
Preferably, the auxiliary agent is a sodium bentonite substance, and the sodium bentonite substance is sodium bentonite or a sodium bentonite modified substance.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, C2-C8 olefin ammonium salt and water; the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: (0.05-0.1): 10.
preferably, the C2-C8 olefin ammonium salt is (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride.
The particle size of the sodium bentonite is 0.03-0.07 mm.
The cross-linking agent is selected from one or more of N, N-methylene bisacrylamide, N-isopropyl acrylamide, N-N-propyl acrylamide, N-diethyl acrylamide, urotropin and formaldehyde.
Preferably, the cross-linking agent consists of N, N-methylene bisacrylamide and urotropine; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: (0.05-0.1).
The initiator is one or more of ammonium persulfate, potassium persulfate, hydrogen peroxide, tert-butyl hydroperoxide, benzoyl peroxide and azobisisobutyronitrile.
The invention also provides a preparation method of the multipolymer elastic particle profile control agent for the oil field chemical oil extraction, which comprises the following steps: under the conditions of normal temperature and normal pressure, sequentially adding water and reaction monomers into a reaction kettle according to the weight part ratio, mixing, adding an auxiliary agent, stirring until the mixture is completely hydrated, adding a crosslinking agent, introducing nitrogen for 10-30 minutes, adding an initiator, uniformly stirring, keeping the constant temperature of 55-65 ℃, and stirring for 4-8 hours to obtain polymer gel; and drying, crushing and shearing the polymer gel for granulation to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field.
The particle size of the multipolymer elastic particle profile control agent for the oilfield chemical oil extraction can be 1/3-2/3 of the average diameter of the aperture of a channel inlet of the bottom layer part in the oilfield construction site; such as 100-150 mesh.
Has the advantages that: the invention relates to a multipolymer elastic particle profile control agent for chemical oil extraction in oil fields, which is a water-absorbent resin, and the particles after water absorption and expansion have certain elasticity, strength and water retention performance, and have the advantages of simple preparation, good temperature resistance and salt resistance, convenient construction, less pollution to non-target layers and the like. The polymer particle molecule contains strong hydrophilic groups and has a certain degree of crosslinking, and is a three-dimensional space network structure, and the special chemical structure and the network structure enable the water absorption mode of the polymer particle to have physical adsorption, chemical adsorption and network adsorption, so that the polymer particle has strong water absorption expansion capacity. More importantly, the pre-crosslinked particle gel after water swelling can generate reversible deformation under the action of external force, and the deformation can be recovered to a certain extent when the external force is reduced. Therefore, the characteristics can be fully utilized in the deep profile control and the flooding and the change of the oil reservoir pressure field are combined, the deep fluid steering is realized, the sweep efficiency is improved, the effect of the profile control and the flooding agent in the deep profile control of the high-water-content and large-pore-canal oil field is widely accepted, and the profile control and the flooding agent become an important technical means for deep excavation and potential stabilization of the high-water-content and high-production-degree oil field in China.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.
The words "preferred", "further preferred", and the like, in the present invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein. For example, a stated range from "1 to 10" should be considered to include any and all subranges between the minimum value of 1 and the maximum value of 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, and the like.
A multipolymer elastic particle profile control agent for oil field chemical oil extraction comprises the following raw materials: reaction monomer, cross-linking agent, assistant, initiator and water.
In one embodiment, the multipolymer elastic particle profile control agent for oilfield chemical oil extraction comprises the following raw materials in parts by weight: 45-60 parts of reaction monomer, 0.04-0.1 part of cross-linking agent, 7.5-10 parts of auxiliary agent, 0.04-0.1 part of initiator and 30-55 parts of water.
In one embodiment, the multipolymer elastic particle profile control agent for oilfield chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
In one embodiment, the reactive monomer is a monomer containing at least-COOH or-CONH-or-CONH2The olefinic compounds of (1).
In one embodiment, the reactive monomer is selected from one or more of acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate (CAS number: 5165-97-9), methacrylamide, sodium allylsulfonate, 2-dimethyl-7-octenoic acid, N-methacryl-1-aziridinecarboxamide.
In one embodiment, the reactive monomers consist of 2, 2-dimethyl-7-octenoic acid, sodium 2-acrylamido-2-methylpropanesulfonate, and N-methacryl-1-aziridinecarboxamide; the molar ratio of the 2, 2-dimethyl-7-octenoic acid to the sodium 2-acrylamido-2-methylpropanesulfonate to the N-methacryl-1-aziridinecarboxamide is 1: (0.1-0.3): (0.6-0.9).
And reacting the monomers to obtain the polyacrylic acid substance.
In the experimental process, the fact that the water absorption multiple and the compressive strength of the obtained polymer particles can be improved by adopting a specific polyacrylic acid substance is unexpectedly found, probably because a three-dimensional network system formed in the system contains polar groups such as hydroxyl, amide, sulfonic acid and the like, and can act with water molecules under the action of water driving to form a hydration layer; the distance between molecular chains is increased due to the 2, 2-dimethyl-7-octenoic acid and the N-methacryl-1-aziridine formamide, the network space is enlarged, and the water absorption multiple is further improved; and possibly because the steric hindrance of molecular motion is improved by the N-methacryl-1-aziridine formamide, and the Ka factor is reduced when the polymer acts+、Na+The action of the said agent can produce molecular curling, reduce viscosity, lower colloid forming property and blocking performance, and increase the acting force for destroying molecular arrangement or motion, so as to raise compression strength.
It was also found during the experiments that when the molar ratio of 2, 2-dimethyl-7-octenoic acid, sodium 2-acrylamido-2-methylpropanesulfonate and N-methacryl-1-aziridinecarboxamide was 1: (0.1-0.3): (0.6-0.9) the obtained polymer particles have better comprehensive performance; probably because when the content of the 2-acrylamide-2-methyl sodium propanesulfonate is too small, the acting force of the particles and water molecules is reduced, a hydration layer is weakened, the water absorption capacity is reduced, and the oil displacement effect is reduced, and when the content of the 2-acrylamide-2-methyl sodium propanesulfonate is too large, the acting force of the particles and the rock surface is weakened, and the acting force of the particles and metal cations is improved, so that the plugging and salt resistance is reduced; in addition, when the content of N-methacryl-1-aziridine formamide is too high, the degree of freedom of molecular motion is too small, and the molecules are not easy to move under the action of external force, so that the rebound resilience and the shear resistance of the particles are reduced.
In one embodiment, the auxiliary agent is selected from one or more of sodium bentonite, modified starch, and carboxymethyl cellulose.
In one embodiment, the adjuvant is a sodium bentonite, and the sodium bentonite is sodium bentonite or a sodium bentonite modifier.
Sodium bentonite
Bentonite is a kind of clay rock, also called montmorillonite clay rock, which often contains a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite, etc.; generally white and light yellow, and light grey, light green, pink, brownish red, brick red, gray black and the like due to the change of iron content; wax, earthy or greasy luster; bentonite is somewhat loose as earth, and somewhat dense and hard. The main chemical components are silicon dioxide, aluminium oxide and water, and also contain elements of iron, magnesium, calcium, sodium and potassium, etc., Na2The O and CaO contents have a considerable influence on the physicochemical properties and the process technical performance of the bentonite. Montmorillonite minerals belong to monoclinic system, usually in the form of earthy blocks, and are white, sometimes with light red, light green, light yellow, etc. The luster was dull. A hardness of 1 to 2 and a density of 2 to 3g/cm3. According to the species and content of exchangeable cations of montmorillonite and the magnitude of interlayer charges, bentonite can be divided into sodium bentonite (alkaline earth), calcium bentonite (alkaline earth) and natural bleaching earth (acid earth or acid clay), wherein the calcium bentonite comprises calcium sodium base, calcium magnesium base and the like. The bentonite has strong hygroscopicity and expansibility, can adsorb water with volume being 8-15 times of that of the bentonite, and has volume expansion being several times to 30 times; can be dispersed into a gelatinous state and a suspended state in an aqueous medium, and the medium solution has certain viscosity, thixotropy and lubricity; has stronger cation exchange capacity; the adsorption capacity for various gases, liquids and organic substances is certain, and the maximum adsorption capacity can reach 5 times of the self weight; the admixture of the high-performance water-based adhesive and water, mud or fine sand has plasticity and cohesiveness; the acid bleaching earth with surface activity (activated clay, natural bleaching earth-acid clay) can adsorb colored ions.
In one embodiment, the raw material for preparing the sodium bentonite modifier comprises: sodium bentonite, C2-C8 olefin ammonium salt and water; the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: (0.05-0.1): 10.
in one embodiment, the method for preparing the sodium bentonite modifier comprises the following steps: taking sodium bentonite, C2-C8 olefin ammonium salt and water according to the weight ratio, adding the sodium bentonite and the C2-C8 olefin ammonium salt into the water, stirring for 15-20h at the temperature of 60-80 ℃, centrifuging, taking precipitate, and drying to obtain the nano-composite material.
In one embodiment, the C2-C8 olefinic ammonium salt is (2E) -3-carboxy-N, N, N-trimethyl-2-propene-1-ammonium chloride (CAS number: 144205-67-4).
Experiments show that when 3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride is used for modifying sodium bentonite, the water absorption multiple, the compressive strength, the thermal stability, the salt resistance and the blocking property can be effectively improved, and probably due to the synergistic effect of the sodium bentonite and polyacrylic acid substances, positive and negative ions act simultaneously, so that Ka in the system is reduced+、Na+The salt resistance is improved under the action of sulfonic acid groups, the extension of molecular chains is facilitated, the viscosity and the water absorption times are improved, and the gelling is promoted; in addition, the method realizes the molecular-level doping, namely improves the dispersibility of the sodium bentonite in a system, also forms a chemical network structure which is mutually penetrated physically and chemically, and improves the compressive strength.
In addition, when the weight ratio of the sodium bentonite, the C2-C8 olefin ammonium salt and the water is controlled to be 1: (0.05-0.1): the 10 th polymer particle is preferable, and when the content of the sodium bentonite is higher, the crosslinking density is improved, the distance between crosslinking points is shortened, the extrusion of the crosslinking points can be caused, the dehydration of a system can be caused, the excessively dense crosslinking points can prevent the extension of molecules, and the water absorption multiple is reduced.
In one embodiment, the particle size of the sodium bentonite is 0.03-0.07 mm.
In the preparation process of the sodium bentonite modifier, the adoption of the proper particle size of the sodium bentonite is beneficial to the optimization of water absorption multiple, compressive strength, thermal stability, salt tolerance and blocking performance, and the particle size of the sodium bentonite is bonded and agglomerated possibly when the particle size is too small, so that the sodium bentonite is unevenly distributed in a system in the preparation process of the polymer, and the compressive strength, the water absorption multiple, the salt tolerance and the blocking performance are influenced; when the particle size is larger, the steric hindrance is larger, the relative motion freedom of the system is reduced, the stretching of molecules and the uniformity and integrity of a crosslinking system are influenced, and the overall performance of the polymer particles is reduced.
In one embodiment, the cross-linking agent is selected from one or more of N, N-methylenebisacrylamide, N-isopropylacrylamide, N-propylacrylamide, N-diethylacrylamide, urotropin, formaldehyde.
In one embodiment, the cross-linking agent consists of N, N-methylenebisacrylamide and urotropin; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: (0.05-0.1).
In the experimental process, the applicant finds that when the N, N-methylene bisacrylamide and the urotropine are used as the system cross-linking agent together, the water absorption and temperature resistance can be improved; the shearing capacity is improved probably because a part of network structure is formed under the action of N, N-methylene bisacrylamide, and the urotropin can form formaldehyde under the heating condition and then reacts with other molecules in the system to form the network structure, so that the crosslinking effect is delayed to a certain extent; and based on a physical and chemical interpenetrating network structure formed by a polymer system, a certain amount of urotropine can be dissociated in the network structure of the system and further decomposed and crosslinked in an oil well channel with high temperature or different pressure intensities, so that the water absorption multiple and the temperature resistance are improved, and the shear resistance is realized.
Furthermore, it has been unexpectedly found that when the total parts by weight of the crosslinking agent is 0.04 to 0.1 parts, the molar ratio of N, N-methylenebisacrylamide to urotropin is 1: (0.05-0.1) good water absorption, temperature resistance and expansion effect; probably because the crosslinking points are too dense when the content of the crosslinking agent is too much, dehydration can be generated under the extrusion effect of the crosslinking agent, a large amount of molecules can be curled, the viscosity is reduced, and the water absorption times and the blocking capability of the system are reduced; when the content of urotropin is high, the crosslinking density of the initial polymer system is low, gelling is affected, and the effect of blocking cannot be achieved.
In one embodiment, the initiator is one or more of ammonium persulfate, potassium persulfate, hydrogen peroxide, tert-butyl hydroperoxide, benzoyl peroxide, and azobisisobutyronitrile.
In one embodiment, the preparation method of the multipolymer elastic particle profile control agent for oilfield chemical oil recovery comprises the following steps: under the conditions of normal temperature and normal pressure, sequentially adding water and reaction monomers into a reaction kettle according to the weight part ratio, mixing, adding an auxiliary agent, stirring until the mixture is completely hydrated, adding a crosslinking agent, introducing nitrogen for 10-30 minutes, adding an initiator, uniformly stirring, keeping the constant temperature of 55-65 ℃, and stirring for 4-8 hours to obtain polymer gel; and drying, crushing and shearing the polymer gel for granulation to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field.
In one embodiment, the particle size of the multipolymer elastic particle profile control agent for the oilfield chemical oil extraction can be 1/3-2/3 of the average diameter of the pore diameter of the channel inlet of the bottom layer part of the oilfield construction field; such as 100-150 mesh.
The present invention will now be described in detail by way of examples, and the starting materials used are commercially available unless otherwise specified.
Examples
Example 1
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is sodium bentonite.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 2
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing acrylic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the acrylic acid to the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is sodium bentonite.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 3
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 4
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is urotropin.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 5
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is formed by mixing N, N-methylene bisacrylamide and urotropine; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: 0.085.
the initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 6
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 45 parts of reaction monomer, 0.04 part of cross-linking agent, 7.5 parts of auxiliary agent, 0.04 part of initiator and 30 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is formed by mixing N, N-methylene bisacrylamide and urotropine; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: 0.085.
the initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Example 7
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 60 parts of reaction monomer, 0.1 part of cross-linking agent, 10 parts of auxiliary agent, 0.1 part of initiator and 55 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is formed by mixing N, N-methylene bisacrylamide and urotropine; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: 0.085.
the initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 1
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 1.25: 0.75.
the auxiliary agent is sodium bentonite.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 2
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 2.
the auxiliary agent is sodium bentonite.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 3
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.01: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 4
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.3: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 5
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 2000 meshes (namely 0.0065mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county, and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 6
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 100 meshes (namely 0.0065mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county, and is white in color.
The cross-linking agent is N, N-methylene bisacrylamide.
The initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Comparative example 7
The multipolymer elastic particle profile control agent for the oil field chemical oil extraction comprises the following raw materials in parts by weight: 50 parts of reaction monomer, 0.07 part of cross-linking agent, 9 parts of auxiliary agent, 0.06 part of initiator and 45 parts of water.
The reaction monomer is formed by mixing 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methylacryloyl-1-aziridine formamide, wherein the molar ratio of the 2, 2-dimethyl-7-octenoic acid, the 2-acrylamide-2-methyl sodium propane sulfonate to the N-methylacryloyl-1-aziridine formamide is 1: 0.2: 0.75.
the auxiliary agent is a sodium bentonite modifier.
The sodium bentonite modifier is prepared from the following raw materials: sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water, wherein the weight ratio of the sodium bentonite to the C2-C8 olefin ammonium salt to the water is 1: 0.08: 10.
the preparation method of the sodium bentonite modifier comprises the following steps: taking sodium bentonite, (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride and water according to the weight ratio, adding the sodium bentonite and the (2E) -3-carboxyl-N, N, N-trimethyl-2-propylene-1-ammonium chloride into the water, stirring for 18h at the rotating speed of 150r/min at the temperature of 70 ℃, then centrifuging for 20min at the rotating speed of 6000r/min, taking the precipitate, and drying for 24h at the temperature of 95 ℃ to obtain the nano-composite material.
The particle size of the sodium bentonite is 300 meshes (namely 0.05mm), and the sodium bentonite is provided by a mineral product processing factory in Lingshou county Yufeng and is white in color.
The cross-linking agent is formed by mixing N, N-methylene bisacrylamide and urotropine; the weight ratio of the N, N-methylene bisacrylamide to the urotropine is 1: 1.
the initiator is ammonium persulfate.
The preparation method of the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field comprises the following steps: sequentially adding water and a reaction monomer into a reaction kettle according to the weight part ratio under the conditions of normal temperature of 20 ℃ and normal pressure, adding an auxiliary agent after mixing, stirring at the rotating speed of 300r/min until the mixture is completely hydrated, then adding a cross-linking agent, introducing nitrogen for 20 minutes, adding an initiator, uniformly stirring at the rotating speed of 300r/min, keeping the temperature at 60 ℃, and stirring at the rotating speed of 300r/min for 6 hours to obtain polymer gel; and drying the polymer gel at the temperature of 70 ℃, crushing, shearing and granulating to obtain the multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field, wherein the granularity is 100 meshes.
Evaluation of Performance
1. The method for testing the water absorption multiple comprises the following steps: testing the water absorption times of the reference brine and the mixed brine respectively
Setting the drying temperature at 105 deg.C, keeping constant temperature, uniformly spreading 5.0g sample on a drying tray, drying in a drying oven for 4 hr, taking out the drying tray from the constant temperature drying oven with tweezers, and placing into a dryerAfter cooling for 30 minutes to room temperature, the dried sample was weighed on an electronic balance (to the nearest 0.0001g) and recorded as m. The dried sample was placed in a 250mL stoppered graduated cylinder. Measuring 240mL of reference saline or mixed saline, adding the reference saline or mixed saline into a measuring cylinder with a plug containing a sample, quickly shaking to remove bubbles, reading the liquid level volume, and recording as H0And covering a plug and standing at normal temperature for 24 hours. Filtering the sample soaked in the measuring cylinder with a plug by using a standard sieve, and measuring the residual volume of the filtered sample by using the measuring cylinder, wherein the residual volume is marked as H1. Three parallel experimental determinations were performed, and the values were summed and averaged. When the single measurement value of the sample is greater than the deviation of the average value by 0.2, sampling again for measurement; the calculation formula is shown in formula 1:
Figure BDA0002096625210000181
in formula 1:
c represents the water absorption capacity of the sample; m represents the mass of the dried sample, g; ρ represents the density of the sample, g/cm3；H0Represents the initial volume of water added in the measuring cylinder with a plug, mL; h1The volume of water remaining after expansion of the sample in the stoppered cylinder is indicated as mL.
Reference saline: 950mg/L sodium chloride brine; standard sieve: 0.833mm aperture.
Mixed brine configuration 20 × 104mg/L saline, wherein the saline is prepared from NaCl: KCl: CaCl: MgCl is 6:1:2: 1.
2. Testing of compressive Strength
Weighing 5g of sample by using an electronic balance, placing the sample into a 500mL beaker, measuring 400mL of reference saline by using a 500mL measuring cylinder, pouring the reference saline into the beaker filled with the sample, covering the beaker, placing the beaker at normal temperature for 24 hours, placing the fully expanded sample into a particle parameter tester, installing a pore plate with the diameter of 0.3mm, and adjusting the tester to seal the pore plate. The instrument was slowly pressurized at a constant rate with a manual high pressure metering pump at 1min20 cycles, and the state of the orifice effluent below the instrument was observed. When the sample in the instrument is just pressed out from the pore plate, the pressure applied to the instrument at the moment is recorded, and the pressure is the compressive strength value. Three measurements were performed in parallel and the measurements were summed and averaged. When the deviation of the single measurement value of the sample from the average value is more than 0.2, the measurement is carried out again.
The samples were left at 45 ℃ for 30 days, and then the compressive strength of the samples was measured again to evaluate the thermal stability.
3. Plugging Performance test
Filling 500mL of tap water into a beaker at room temperature, drying a sample product, grinding the sample product into 200-mesh particles, filling enough sample particles into a core tube, opening a valve 1 and a valve 2 (a vacuum pump is connected with a filter flask through a first conduit, the filter flask is connected with the core tube through a second conduit, and the core tube is connected with the beaker through a third conduit); and after the vacuum degree is stabilized, closing the valve 1, enabling water in the beaker to enter the filter flask through the core tube under the action of pressure difference, stopping the test if no liquid enters the filter flask after 1 hour, measuring the volumes of the water in the filter flask and the beaker, respectively recording V1 and V2, and calculating the plugging rate by using a formula 2.
Figure BDA0002096625210000191
In formula 2: e represents the plugging rate,%; v1Represents the volume of water in the suction flask, mL; v2Represents the volume of water remaining in the beaker, mL.
4. Viscosity Retention test
Taking 300mL of a sample to be measured each time, respectively measuring the viscosity change condition after shearing for 60min at a shearing speed of 700r/min at 25 ℃, and measuring the viscosity change condition after 30min at intervals, wherein a 500mL measuring cylinder is used for measuring 250mL of the sample, the sample is placed in a 250mL high-speed beaker, a proper rotor is selected, if the reading of the viscometer exceeds the range of measurement, the proper rotor is reselected, the viscosity after the value is stable is measured by a distributed viscometer at a rotating speed of 6r/min, the viscosity retention ratio (%) is the viscosity after shearing/the viscosity before shearing × 100, the three times of measurement are carried out in parallel, and the measurement values are summed and averaged.
The multipolymer elastic particle profile control agent for oil field chemical oil extraction prepared in examples 1-5 and comparative examples 1-7 is used as a sample and is respectively tested, and the specific test results are shown in table 1.
Table 1: test result table
Figure BDA0002096625210000201
Figure BDA0002096625210000211
The above examples are merely illustrative and serve to explain some of the features of the invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims not be limited by the choice of examples illustrating features of the invention, and that technological advances will form possible equivalents or sub-substitutes not presently contemplated for reasons of inaccuracy of the linguistic expressions, and that such variations are to be construed as being covered by the appended claims where possible.

Claims (6)

1. The multipolymer elastic particle profile control agent for the chemical oil extraction of the oil field is characterized by comprising the following raw materials in parts by weight: 45-60 parts of reaction monomer, 0.04-0.1 part of cross-linking agent, 7.5-10 parts of auxiliary agent, 0.04-0.1 part of initiator and 30-55 parts of water;
the reaction monomer consists of 2, 2-dimethyl-7-octenoic acid, 2-acrylamide-2-methyl sodium propane sulfonate and N-methacryl-1-aziridine formamide; the molar ratio of the 2, 2-dimethyl-7-octenoic acid to the sodium 2-acrylamido-2-methylpropanesulfonate to the N-methacryl-1-aziridinecarboxamide is 1: (0.1-0.3): (0.6-0.9).
2. The multipolymer elastomeric particle profile control agent for oilfield chemical oil recovery of claim 1, wherein the auxiliary agent is selected from one or more of sodium bentonite, modified starch, carboxymethyl cellulose.
3. The multipolymer elastomeric particle profile control agent for oilfield chemical oil recovery as defined in claim 1, wherein the cross-linking agent is selected from one or more of N, N-methylenebisacrylamide, urotropin, and formaldehyde.
4. The multipolymer elastomeric particle profile control agent for oilfield chemical oil recovery of claim 3, wherein the cross-linking agent consists of N, N-methylenebisacrylamide and urotropin.
5. The multipolymer elastomer particle profile control agent for oilfield chemical oil recovery as defined in claim 4, wherein the weight ratio of N, N-methylenebisacrylamide to urotropin is 1: (0.05-0.1).
6. The multipolymer elastomeric particle profile control agent for oilfield chemical oil recovery as defined in claim 1, wherein the initiator is selected from one or more of ammonium persulfate, potassium persulfate, hydrogen peroxide, t-butyl hydroperoxide, benzoyl peroxide, azobisisobutyronitrile.
CN201910520883.1A 2019-06-17 2019-06-17 Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction Active CN110105940B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910520883.1A CN110105940B (en) 2019-06-17 2019-06-17 Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910520883.1A CN110105940B (en) 2019-06-17 2019-06-17 Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction

Publications (2)

Publication Number Publication Date
CN110105940A CN110105940A (en) 2019-08-09
CN110105940B true CN110105940B (en) 2020-07-03

Family

ID=67495202

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910520883.1A Active CN110105940B (en) 2019-06-17 2019-06-17 Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction

Country Status (1)

Country Link
CN (1) CN110105940B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111117582A (en) * 2019-12-30 2020-05-08 长江大学 Controllable cross-linking type gel plugging agent and preparation method thereof

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174856A2 (en) * 1984-09-13 1986-03-19 Hercules Incorporated Gelled aqueous compositions
CN1796484A (en) * 2004-12-28 2006-07-05 李松棠 Method for prepaing granular profile control agent in copolymerization crosslinking type
CN103265934A (en) * 2013-05-02 2013-08-28 中国石油天然气股份有限公司 Profile control agent for water injection well, and preparation method and application thereof
CN103333669A (en) * 2013-07-26 2013-10-02 武汉工程大学 Preparation method of polymer weak gel deep profile control agent
CN104513341A (en) * 2013-09-27 2015-04-15 中国石油天然气股份有限公司 Slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof
CN104962263A (en) * 2015-05-28 2015-10-07 中国石油天然气股份有限公司 Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method
CN106010491A (en) * 2016-05-16 2016-10-12 中国石油化工股份有限公司 Pre-crosslinking swellable profile control agent, preparation method and application
CN104087275B (en) * 2014-07-14 2016-10-19 中国石油大学(华东) A kind of high-temperature-resistant high-salt tiny gels granular profile control agent and its preparation method and application
CN106589225A (en) * 2015-10-20 2017-04-26 中国石油化工股份有限公司 Polymer gel particle for profile control and water plugging of deep parts as well as preparation method thereof
CN106661440A (en) * 2014-09-25 2017-05-10 哈利伯顿能源服务公司 Composition including a curable resin and organophilically-modified clay for subterranean oil well applications

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174856A2 (en) * 1984-09-13 1986-03-19 Hercules Incorporated Gelled aqueous compositions
CN1796484A (en) * 2004-12-28 2006-07-05 李松棠 Method for prepaing granular profile control agent in copolymerization crosslinking type
CN103265934A (en) * 2013-05-02 2013-08-28 中国石油天然气股份有限公司 Profile control agent for water injection well, and preparation method and application thereof
CN103333669A (en) * 2013-07-26 2013-10-02 武汉工程大学 Preparation method of polymer weak gel deep profile control agent
CN104513341A (en) * 2013-09-27 2015-04-15 中国石油天然气股份有限公司 Slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof
CN104087275B (en) * 2014-07-14 2016-10-19 中国石油大学(华东) A kind of high-temperature-resistant high-salt tiny gels granular profile control agent and its preparation method and application
CN106661440A (en) * 2014-09-25 2017-05-10 哈利伯顿能源服务公司 Composition including a curable resin and organophilically-modified clay for subterranean oil well applications
CN104962263A (en) * 2015-05-28 2015-10-07 中国石油天然气股份有限公司 Middle-deep stratum oil reservoir horizontal multilateral well chemical packing temporary plugging agent and water plugging method
CN106589225A (en) * 2015-10-20 2017-04-26 中国石油化工股份有限公司 Polymer gel particle for profile control and water plugging of deep parts as well as preparation method thereof
CN106010491A (en) * 2016-05-16 2016-10-12 中国石油化工股份有限公司 Pre-crosslinking swellable profile control agent, preparation method and application

Also Published As

Publication number Publication date
CN110105940A (en) 2019-08-09

Similar Documents

Publication Publication Date Title
CN111138594B (en) Preparation method of environment-friendly high-temperature-resistant water-based drilling fluid plugging anti-sloughing agent
US4293427A (en) Drilling fluid containing a copolymer filtration control agent
US5382371A (en) Polymers useful in the recovery and processing of natural resources
CA1254026A (en) Polymers useful in the recovery and processing of natural resources
CN104387530A (en) Preparation method of high-content calcium bentonite water shutoff agent
Saghafi Retention characteristics of enhanced preformed particle gels (PPGs) in porous media: Conformance control implications
CN105504158A (en) Intelligent gel particles capable of being crosslinked again under stratum condition and preparation method and application of intelligent gel particles
US4547299A (en) Drilling fluid containing a copolymer filtration control agent
CN103992433A (en) Method for preparing high-strength high-temperature-resistance polymer nanospheres
CA2853628C (en) Delayed, swellable particles for prevention of fluid migration through damaged cement sheaths
CN116396731B (en) Hydrophobic association high-performance water-based drilling fluid for shale stratum and preparation method and application thereof
CN111087998B (en) Slow-expansion particles and preparation method thereof
CN110105940B (en) Multicomponent copolymer elastic particle profile control agent for oil field chemical oil extraction
CN114716984B (en) Cementing and plugging type wall fixing agent for water-based drilling fluid and preparation method and application thereof
CN103980872A (en) Environmental-friendly gel plugging agent applicable to low-temperature oil pool and applications of gel plugging agent
CN115466603B (en) 240 ℃ resistant and salt resistant plugging type water-based drilling fluid, and preparation method and application thereof
CN109370558B (en) Temporary plugging agent suitable for temporary plugging fracturing process of oil-gas reservoir and stratum water plugging method
RU2597593C1 (en) Method for balancing injection well water-intake capacity profile and restriction of water influx to production wells
CN113136185A (en) Organic water plugging gel for low-temperature hypersalinity oil reservoir
CA1144298A (en) Aqueous drilling fluid additive, composition and process
RU2064571C1 (en) Gel-forming compound for shutoff of water inflow and increase of oil recovery
CN110204653B (en) Profile control and water shutoff agent zwitterionic polymer particles for oilfield chemical oil extraction
CN107312508B (en) Application of aluminum salt complex in preparation of drilling fluid and drilling fluid
CN113528104B (en) Jelly liquid and application thereof as suspension partition board water shutoff agent
CN104119849A (en) Jelly-fiber composite plugging agent and preparation method thereof

Legal Events

Date Code Title Description
PB01 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