CN113308235A - Method for realizing flow regulating agent suitable for high-temperature and high-salinity fracture-cave oil reservoir of tower river - Google Patents
Method for realizing flow regulating agent suitable for high-temperature and high-salinity fracture-cave oil reservoir of tower river Download PDFInfo
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- CN113308235A CN113308235A CN202010120281.XA CN202010120281A CN113308235A CN 113308235 A CN113308235 A CN 113308235A CN 202010120281 A CN202010120281 A CN 202010120281A CN 113308235 A CN113308235 A CN 113308235A
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- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
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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
- C08F220/56—Acrylamide; Methacrylamide
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention discloses a method for realizing a flow regulating agent suitable for a high-temperature and high-salinity fracture-cave oil reservoir of a Tahe, which relates to the field of oil and gas resource development, and integrates controllable strength, controllable particle size, controllable oil-water selectivity and controllable density into a flow regulating system, wherein: the strength is controllable: by block copolymerization of polymers and adjustment of the ratio of aromatic to unsaturated aliphatic hydrocarbonsNow; the particle size is controllable: the method is realized by adding propylene oxide/styrene, N-sec-butyl acrylamide and 2-acrylamide monomers in different proportions in the polymerization process; the oil-water selectivity is controllable: by using oil-soluble monomers, controlling the degree of polymerization and prohibiting cross-linking of the polymer; the density is controllable: by mixing polymers with different densities; according to the actual situation of the carbonate reservoir stratum of the tower river, before the flow channel adjustment construction process, the invention can ensure that the production strength is 0-5MPa, the grain diameter is 0.5-10mm, the oil solubility is realized, and the density is 1.0-1.3g/cm3An adjustable flow channel modifier.
Description
Technical Field
The invention relates to the field of oil and gas resource development, in particular to a method for ensuring that the production strength is 0-5MPa and the particle size is 0 before the flow channel adjustment construction process according to the actual situation of a rock-water karst reservoir stratum of a carbonate rock in a tower river and a river5-10mm, oil soluble and density 1.0-1.3g/cm3A method of adjustable flow channel modulators.
Background
Patent CN107474807A (fracture-cavity reservoir flow channel modifier and preparation method thereof) reports a fracture-cavity reservoir flow channel modifier, which comprises: a carrier fluid and plugging regulation particles, wherein the carrier fluid comprises a polymer and water in a ratio of 0-3: 97-100; the plugging control particle is a viscoelastic particle mixture, and comprises the following components in a ratio of 95-100: 0-5: 05 high molecular polymer, calcium carbonate and bentonite; the proportion of the carrying fluid to the plugging regulating particles is 10-100: 0-90. The invention is suitable for the flow channel adjustment of high temperature and high mineralization of the reservoir.
Patent CN110105939A (a fracture-cavity reservoir slow-swelling density controllable flow channel regulating agent system and a preparation method thereof) reports a fracture-cavity reservoir slow-swelling density controllable flow channel regulating agent system and a preparation method thereof. The agent system consists of the following components in percentage by mass: 8-14% of main agent, 0.6-1.2% of cross-linking agent, 0.006-0.01% of initiator, 0.6-0.8% of low-temperature slow-expansion particle hectorite nano-particles, 10-30% of additive, wherein the additive is a mixture consisting of one or two of rubber particles and vermiculite and montmorillonite, and the balance is water; the preparation method provided by the invention comprises the following steps: adding montmorillonite into water to prepare a montmorillonite dispersion system; adding a main agent, a cross-linking agent, an initiator and lithium soap nano particles into a montmorillonite dispersion system to prepare a main agent solution; rubber particles or vermiculite are added into a main agent solution to prepare the slow expansion density-controllable flow channel adjusting agent, the slow expansion density-controllable low-temperature slow expansion agent is controllable, and is suitable for adjusting and increasing the deep part of a high-temperature and high-salinity fracture-vug oil reservoir flow channel with the mineralization degree of 25 ten thousand at 140 ℃ and blocking water.
The invention discloses a flow regulating agent particle, a flow regulating agent, a preparation method and an application thereof, and relates to the field of petroleum development, in particular to an oil-soluble coated particle flow regulating agent, a preparation method thereof and an application thereof in fracture-cavity oil reservoir exploitation, wherein the flow regulating agent particle is disclosed in patent CN109439300A (oil-soluble coated particle flow regulating agent, and a preparation method and an application thereof). The oil-soluble coated particle flow regulating agent is a core-shell structure with a coated core as a core layer and a coating agent as a shell layer, wherein the coated core is a plugging material, and the coating agent consists of petroleum resin and hollow microspheres; based on the total weight of the coated particle flow regulator, the content of the petroleum resin is 10-40%, the content of the hollow microspheres is 9-40%, the content of the cotton linters is 1-10%, and the content of the coated core is 35-80% by weight. The invention also discloses a preparation method of the coated particle flow regulating agent and application of the coated particle flow regulating agent in fracture-cavity oil reservoir exploitation. The oil-soluble coated particle flow regulator disclosed by the invention can be adhered at high temperature, is not influenced by the formation mineralization degree, can selectively block a water flow dominant flow channel, and has small damage to an oil flow channel.
Patent CN108546550A (fracture-cavity water-drive flexible flow regulation particles and preparation method thereof) reports a fracture-cavity water-drive flexible flow regulation particle and preparation method thereof, wherein the fracture-cavity water-drive flexible flow regulation particle comprises, by weight, 10% -40% of N-vinyl pyrrolidone, 20% -50% of acrylamide, 0.1% -1% of N, N-methylene bisacrylamide, 0.1% -1% of sodium formaldehyde sulfoxylate, 0.1% -0.5% of ammonium persulfate, 1% -5% of clay, and the balance of water. The flexible flow-regulating particles for the fracture-cavity water drive have the advantages of low cost, good performance, long stable period and adjustable strength, and can effectively solve the problem of water channeling of weathered crust reservoir on the surface layer of a fracture-cavity oil reservoir.
Patent CN107459983A (temperature-resistant and salt-resistant filling flow-regulating granule and preparation method thereof) reports a temperature-resistant and salt-resistant filling flow-regulating granule, which comprises the following components in parts by weight: 65-85 parts of a product obtained by catalyzing solvent oil and petroleum resin by using a Ni/gamma-Al 2O3 catalyst, 20-50 parts of bentonite, 5-10 parts of calcium hydroxide, 0.1-0.5 part of N, N-methylene bisacrylamide, 20-50 parts of acrylamide, 0.1-0.5 part of potassium persulfate, 5-10 parts of polyurethane and 30-50 parts of water. The product has the advantages of simple construction, high efficiency, low cost, low density, high strength, low water absorption expansion rate, good heat resistance and the like, can realize the fixed-point placement of deep oil reservoirs, and is suitable for fracture-cavity oil reservoirs.
Patent CN108570150A (elastic flow-regulating granule and preparation method thereof) reports an elastic flow-regulating granule which is a substance of formula (I), Gt is fatty acid triglyceride, and n is 1 to 6. The preparation method comprises heating sulfur to completely melt into liquid to obtain liquid sulfur; uniformly mixing liquid sulfur and plant crude oil or oil foot, and then heating for reaction to obtain solid sulfur rubber particles; and granulating and sorting the solid sulfur rubber particles to obtain the elastic flow-regulating particles.
Patent CN109439300A (flow control agent particle, flow control agent, preparation method and application thereof) reports a flow control agent particle, a flow control agent, and preparation method and application thereof, wherein the flow control agent particle comprises a viscoelastic main agent, a selective cosolvent, a density regulator, an expanding agent and an optional toughening agent, and based on the total weight of the flow control agent particle, the content of the viscoelastic main agent is 30-90%, the content of the selective cosolvent is 3-30%, the content of the density regulator is 0.1-30%, the content of the expanding agent is 1-30%, and the content of the toughening agent is 0-10%. The invention also discloses a flow regulator, which comprises flow regulator particles and carrier fluid, wherein the carrier fluid comprises water and surfactant. Also discloses a preparation method of the flow regulating agent, the flow regulating agent and application of flow regulating agent particles in fracture-cavity type oil reservoir development. The flow regulating agent particles prepared by the invention have good temperature resistance, adhesion and expansibility, and can realize selective adjustment of the dominant water flow channel in the deep part of the stratum.
The existing patent documents are all single agents, and the controllable strength, the controllable particle size, the controllable oil-water selectivity and the controllable density cannot be realized in a flow regulating system in a centralized way, so that the development of the patent is necessary to realize the controllable strength, the controllable particle size, the controllable oil-water selectivity and the controllable density of the same agent system, and further ensure the effective construction of step-by-step adjustment of a flow channel.
Disclosure of Invention
The embodiment of the invention provides a flow regulating agent implementation method suitable for a high-temperature and high-salinity fracture-cave oil reservoir of a tower river. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the embodiments of the present invention, a method for implementing a flow regulating agent suitable for a high-temperature and high-salinity fracture-cavity type oil reservoir of a taw river is provided, which includes: the controllable strength, the controllable particle size, the controllable oil-water selectivity and the controllable density are centralized in a flow regulating system, wherein:
the strength is controllable: the copolymer is prepared by polymer block copolymerization and adjusting the ratio of aromatic hydrocarbon to unsaturated aliphatic hydrocarbon;
the particle size is controllable: the method is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers with different proportions in the polymerization process;
the oil-water selectivity is controllable: by using oil-soluble monomers, controlling the degree of polymerization and prohibiting cross-linking of the polymer;
the density is controllable: by mixing polymers of different densities.
Preferably, the strength is controlled by block copolymerization of the polymer and adjusting the ratio of the aromatic hydrocarbon to the unsaturated aliphatic hydrocarbon, and the specific method comprises the following steps: adopting aromatic hydrocarbon and unsaturated aliphatic hydrocarbon with different proportions to carry out free radical graft copolymerization, and setting the production intensity between 0 and 5MPa according to the stratum condition.
Preferably, the strength is controllable, the proportion of unsaturated aromatic hydrocarbon is increased for the particles with lower strength requirements, the proportion of aromatic hydrocarbon is gradually increased along with the increase of the strength requirements, and the addition amount of the initiator and the polymerization inhibitor is controlled, so that the flow-regulating particles with different strength series are formed.
Preferably, the controllable particle size is realized by adding monomers of propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM in different proportions in the polymerization process, and the specific method comprises the following steps: during the flow-regulated particle polymerization, the monomers propylene oxide/styrene, N-sec-butyl acrylamide and 2-acrylamide are added.
Preferably, the ratio of the monomers propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM is 1: 1: 1-2: 5: 3.
preferably, the particle size is controllable, and the particle size of the flow-regulating particles is 0.5-10 mm.
Preferably, the oil-water selectivity is controlled by adopting oil-soluble monomers, controlling the degree of polymerization and prohibiting the cross-linking of the polymer, and the specific method comprises the following steps: oil-soluble monomers are used in the polymerization process to optimize the functional groups of the monomers while controlling the degree of polymerization and prohibiting cross-linking of the polymer.
Preferably, the particle size of the flow rate particles is processed by a colloid mill.
Preferably, the density control is realized by mixing polymers with different densities, and the specific method comprises the following steps: determined as longitudinally adjusted, using an oil solution having a density of 1.0-1.3g/cm3An adjustable flow channel modifier.
Preferably, the controllable range of the strength is 0-5MPa, the controllable range of the grain diameter is 0.5-10mm, and the controllable range of the density is 1.0-1.3g/cm3The flow channel adjuster of (1).
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the invention provides a method for realizing a flow regulating agent suitable for a high-temperature high-salinity fracture-cave oil reservoir of a tower river, which can ensure that the production strength is 0-5MPa, the particle size is 0.5-10mm, the oil solubility is 1.0-1.3g/cm and the density is 1.0-1.3g/cm before the flow channel is adjusted and constructed according to the actual situation of the stratum of the carbonate rock oil reservoir of the tower river3An adjustable flow channel modifier.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram illustrating a method for implementing a flow modifier suitable for a high-temperature and high-salinity fracture-cavity type oil reservoir of a Tahe according to an exemplary embodiment;
examples
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the structures, products and the like disclosed by the embodiments, the description is relatively simple because the structures, the products and the like correspond to the parts disclosed by the embodiments, and the relevant parts can be just described by referring to the method part.
The invention is further described with reference to the following figures and examples:
example 1:
a method for adjusting a flow channel of a water injection well of a subsurface river karst reservoir comprises the following steps: the controllable strength, the controllable particle size, the controllable oil-water selectivity and the controllable density are realized in a flow regulating system, and the controllable strength is realized by polymer block copolymerization and regulation of the proportion of aromatic hydrocarbon and unsaturated aliphatic hydrocarbon; the controllable particle size is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers in different proportions in the polymerization process; the oil-water selectivity is controllable by adopting oil-soluble monomers, controlling the degree of polymerization and forbidding the cross-linking of the polymers; the density control is achieved by mixing polymers of different densities.
According to the scheme, further, the strength can be controlled by the block copolymerization of the polymer and the adjustment of the ratio of the aromatic hydrocarbon to the unsaturated aliphatic hydrocarbon, and the specific implementation method is as follows: the controllable strength realizing method is to use the experience of polymer block copolymer for reference, adopt aromatic hydrocarbon and unsaturated aliphatic hydrocarbon of different proportions to carry out free radical graft copolymerization, and set the production strength at 0-5MPa according to the actual situation of the stratum, which can be 0MPa, 0.5MPa, 1MPa, 2.5MPa, 4MPa, 5MPa, generally not more than 5 MPa.
Furthermore, the strength can be controlled, the proportion of unsaturated aromatic hydrocarbon can be properly adjusted for particles with lower strength requirements, the proportion of the aromatic hydrocarbon is gradually increased along with the increase of the strength requirements, and the addition amount of the initiator and the polymerization inhibitor is controlled, so that the flow-adjusting particles with different strength series are formed.
Preferably, the controllable particle size is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers with different proportions in the polymerization process, and the specific realization method is as follows: the method for realizing controllable hydrophilic particle size in the flow regulating agent realization method is that by means of the high-temperature characteristic of a tower river stratum, propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers are added in the flow regulating particle polymerization process, and the proportion is regulated, wherein the specific proportion is 1: 1: 1-2: 5: and 3, ensuring that the performance of the synthesized polymer particles is stable in the construction process, but properly softening and deforming under the action of high temperature of the stratum, thereby meeting the requirement of the change of the particle size of the stratum blockage, wherein the particle size is controlled to be 0.5-10mm, can be 0.5mm, 3 mm, 4mm, 6mm or 8mm, can be 10mm in larger size, generally does not exceed 10mm, and is determined according to specific construction conditions.
Furthermore, the particle size is controllable, and oil-soluble particles can be directly cut and granulated according to requirements.
According to the scheme, the oil-water selectivity can be controlled by adopting oil-soluble monomers, controlling the polymerization degree and forbidding the cross-linking of the polymer, and further, the specific implementation method is as follows: the method for realizing the oil-water selectivity control is based on the material, oil-soluble monomers are mostly adopted in the polymerization process, the functional groups of the monomers are optimized, the polymerization degree is controlled, and the cross-linking of the polymers is forbidden, so that the obtained product has good solubility in the crude oil of the tower and river, but can be absolutely insoluble in water, and the requirement of the oil-water selectivity is met.
Furthermore, the density can be controlled by mixing polymers with different densities, and the specific implementation method is as follows: after the longitudinal adjustment is determined, the water injection can be continued or the water injection production of the well can be carried out by adopting the original water injection scheme of the well group, the oil solubility and the density are controlled to be 1.0 to 1.3g/cm3The flow channel modifier of (2) may be 1.0g/cm3、1.1g/cm3、1.15g/cm3、1.2g/cm3、1.3g/cm3Generally, it does not exceed 1.3g/cm3。
Specifically, the controllable range of the strength is 0-5MPa, the controllable range of the grain diameter is 0.5-10mm, and the controllable range of the density is 1.0-1.3g/cm3The flow channel adjuster of (1).
Example 2:
taking the adjustment construction of the flow channel of the A well group of the Tahe oilfield as an example, according to the analysis of the geological and dynamic and static production data of the oil reservoir, the method concentrates controllable strength, controllable particle size, controllable oil-water selectivity and controllable density in a flow adjusting system, wherein:
the strength is controllable: the method is realized by polymer block copolymerization and adjustment of the ratio of aromatic hydrocarbon to unsaturated aliphatic hydrocarbon, specifically, aromatic hydrocarbon and unsaturated aliphatic hydrocarbon with different ratios are adopted to carry out free radical graft copolymerization, and the production strength is set to be 2MPa according to the stratum condition;
the particle size is controllable: the method is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers with different proportions in the polymerization process, wherein the POSM, BAM and AM monomers are polymerized and then blended with C9 oil-soluble resin, modified asphalt and regenerated polyethylene, and specifically, C9 oil-soluble resin, modified asphalt and regenerated polyethylene are selected to be mixed in a ratio of 2: 5: 3 proportion, and cutting into 3-4mm particle size.
The oil-water selectivity is controllable: the method is realized by adopting oil-soluble monomers, controlling the polymerization degree and prohibiting the cross-linking of the polymers, and comprises the following steps: in the polymerization process, oil-soluble monomers are adopted, functional groups of the monomers are optimized, the polymerization degree is controlled, cross-linking of the polymers is forbidden, and the POSM, the BAM and the AM are polymerized and then blended with C9 oil-soluble resin, modified asphalt and regenerated polyethylene, so that the ratio of the C9 oil-soluble resin, the modified asphalt and the regenerated polyethylene is 2: 5: 3, mixing in proportion, and cutting to form particles with the particle size of 3-4mm, wherein the method specifically comprises the following three steps: polymerizing, mixing and cutting. The mixing ratio may be adjusted as necessary, and if necessary, only one of the C9 oil-soluble resin, the modified asphalt, and the recycled polyethylene may be added, or may not be added.
The density is controllable: the method is realized by mixing polymers with different densities, and comprises the following specific steps: determined as the longitudinal adjustment, using oil solution with a density of 1.14-1.2g/cm3Adjustable flow channel regulator with density of 1.19g/cm3The lipophilic particles of (2.5 MPa).
Example 3:
taking the adjustment construction of the flow channel of the B well group of the Tahe oilfield as an example, according to the analysis of the geological and dynamic and static production data of the oil reservoir, the strength, the particle size, the oil-water selectivity and the density are controllable and concentrated in a flow adjusting system, wherein:
the strength is controllable: the method is realized by polymer block copolymerization and adjustment of the ratio of aromatic hydrocarbon to unsaturated aliphatic hydrocarbon, specifically, aromatic hydrocarbon and unsaturated aliphatic hydrocarbon with different ratios are adopted to carry out free radical graft copolymerization, and the production strength is set at 0.5MPa according to the stratum condition;
the particle size is controllable: the method is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers with different proportions in the polymerization process, specifically, the particle size is selected to be 5-10mm, and hydrophilic particles are used for flow channel adjustment construction, so that the POSM, BAM and AM monomers are selected to be mixed in a ratio of 2: 5: 93 proportion, cross-linking, and colloid milling to 5-6mm particle, which is slightly expanded after being absorbed, but has particle diameter less than 10mm and deformation at strength of 0.5 MPa.
The oil-water selectivity is controllable: the method is realized by adopting oil-soluble monomers, controlling the polymerization degree and prohibiting the cross-linking of the polymers, and comprises the following steps: oil-soluble monomers are used in the polymerization process to optimize the functional groups of the monomers while controlling the degree of polymerization and prohibiting cross-linking of the polymer.
The density is controllable: the method is realized by mixing polymers with different densities, and comprises the following specific steps: determined as the longitudinal adjustment, using oil solution with a density of 1.10-1.14g/cm3Adjustable flow channel regulator with density of 1.19g/cm3The lipophilic particles of (2.5 MPa).
Taking the flow channel adjustment construction of a B well group of a Tahe oilfield as an example, according to the analysis of oil reservoir geological and dynamic and static production data, the well needs a flow channel adjusting agent with the density of 1.10-1.14, the strength is 0.5MPa, the particle size is 5-10mm, hydrophilic particles are used for flow channel adjustment construction, and therefore POSM, BAM and AM monomers are selected to be 2: 5: 93 proportion, cross-linking, and colloid milling to 5-6mm particle, which is slightly expanded after being absorbed, but has particle diameter less than 10mm and deformation at strength of 0.5 MPa.
According to the embodiments, the invention provides a method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cavity type oil reservoir of the tower river, which integrates controllable strength, controllable particle size, controllable oil-water selectivity and controllable density in a flow regulating system, and can ensure that the production strength is 0-5MPa, the particle size is 0.5-10mm, the oil solubility is 1.0-1.3g/cm before the flow channel adjustment construction process according to the actual situation of the carbonate rock oil reservoir stratum of the tower river3An adjustable flow channel modifier.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A method for realizing a flow regulating agent suitable for a high-temperature and high-salinity fracture-cave oil reservoir of a tower and a river is characterized by comprising the following steps of: the controllable strength, the controllable particle size, the controllable oil-water selectivity and the controllable density are centralized in a flow regulating system, wherein:
the strength is controllable: the copolymer is prepared by polymer block copolymerization and adjusting the ratio of aromatic hydrocarbon to unsaturated aliphatic hydrocarbon;
the particle size is controllable: the method is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers with different proportions in the polymerization process;
the oil-water selectivity is controllable: by using oil-soluble monomers, controlling the degree of polymerization and prohibiting cross-linking of the polymer;
the density is controllable: by mixing polymers of different densities.
2. The method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the tower river as claimed in claim 1, wherein the strength is controllable by the polymer block copolymerization and the regulation of the ratio of aromatic hydrocarbon to unsaturated aliphatic hydrocarbon, and the specific method comprises the following steps: adopting aromatic hydrocarbon and unsaturated aliphatic hydrocarbon with different proportions to carry out free radical graft copolymerization, and setting the production intensity at 0-5MPa according to the stratum condition.
3. The method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the tower river as claimed in claim 2, wherein the strength is controllable, the proportion of aromatic hydrocarbon is increased for the particles with lower strength requirement, the proportion of aromatic hydrocarbon is gradually increased along with the increase of the strength requirement, and the addition amount of the initiator and the polymerization inhibitor is controlled simultaneously, so that flow regulating particles with different strength series are formed.
4. The method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the Tahe according to claim 3, is characterized in that the controllable particle size is realized by adding propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM monomers in different proportions in the polymerization process, and the specific method comprises the following steps: during the flow-regulated particle polymerization, monomers of propylene oxide/styrene POSM, N-sec-butyl acrylamide BAM and 2-acrylamide AM are added.
5. The method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the Tahe according to claim 4, wherein the monomer ratio of the propylene oxide/styrene POSM, the N-sec-butyl acrylamide BAM and the 2-acrylamide AM is 1: 1: 1-2: 5: 3.
6. the method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the Tahe according to any one of claims 4 to 5, characterized in that the particle size is controllable, and the particle size of the flow regulating particles is 0.5 to 10 mm.
7. The method for realizing the flow regulating agent suitable for the Tahe high-temperature and high-salinity fracture-cave oil reservoir according to claim 6, is characterized in that the oil-water selectivity is realized by adopting oil-soluble monomers, controlling the polymerization degree and prohibiting the cross-linking of polymers, and the specific method comprises the following steps: oil-soluble monomers are used in the polymerization process to optimize the functional groups of the monomers while controlling the degree of polymerization and prohibiting cross-linking of the polymer.
8. The method for realizing the flow regulating agent suitable for the Tahe high-temperature and high-salinity fracture-cave oil reservoir as claimed in claim 6, wherein the particle size of the flow velocity particles is processed by a colloid mill.
9. The method for realizing the flow regulating agent suitable for the high-temperature and high-salinity fracture-cave oil reservoir of the Tahe according to claim 1 or 7, is characterized in that the density can be controlled by mixing polymers with different densities, and the specific method comprises the following steps: determined as longitudinally adjusted, using an oil solution having a density of 1.0-1.3g/cm3An adjustable flow channel modifier.
10. The method for realizing the flow regulating agent suitable for the Tahe high-temperature and high-salinity fracture-cave oil reservoir according to claim 1, characterized in that the controllable range of the strength is 0-5MPa, the controllable range of the particle size is 0.5-10mm, and the controllable range of the density is 1.0-1.3g/cm3The flow channel adjuster of (1).
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