CN111927386B - High-water-content oil-water well reversible deformation isotonic plugging-adjusting production-increasing technology - Google Patents
High-water-content oil-water well reversible deformation isotonic plugging-adjusting production-increasing technology Download PDFInfo
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- CN111927386B CN111927386B CN202010818246.5A CN202010818246A CN111927386B CN 111927386 B CN111927386 B CN 111927386B CN 202010818246 A CN202010818246 A CN 202010818246A CN 111927386 B CN111927386 B CN 111927386B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The invention discloses a reversible deformation isotonic plugging regulation yield increase technology for a high-water-content oil-water well, which comprises the following steps: adding 0.3-0.5 wt% of thermoplastic resin MH-036 as the oil-extraction water-plugging agent into water under stirring, and stirring for 5 minutes to obtain an aqueous solution of the thermoplastic resin MH-036 as the oil-extraction water-plugging agent; adding 8-15% of polyisoprene elastic particles MH-035 as the water shutoff agent for oil recovery into the thermoplastic resin MH-036 aqueous solution of the water shutoff agent for oil recovery to form a stable glue solution; the fracturing truck set for the oil well is quickly injected with the glue solution in the step 2, and the oil production water plugging agent polyisoprene elastic particles MH-035 are injected under the condition of ensuring no sand plugging, so that the volume ratio range of the sand solution is 15-40%, and the mass concentration of the oil production water plugging agent polyisoprene elastic particles MH-035 in the glue solution is improved in a step-by-step manner; the medicament used by the invention has the advantages of economic and easily available raw materials, simple construction process, reduction of preparation cost before construction, remarkable yield increase effect after measures and high cost performance.
Description
Technical Field
The invention relates to the technical field of water plugging of high-water-content oil-water wells, in particular to a reversible deformation isotonic plugging regulation and yield increase technology of a high-water-content oil-water well.
Background
At present, most of main blocks of an oil field enter a high water content development stage, contradictions among layers, in-layers and planes of an oil-water well are increasingly prominent, the potential digging difficulty of residual oil is increasingly high, due to the existence of reservoir heterogeneity, the difference of reservoir physical properties such as pore permeability and the like enables the water absorption degree of each layer of the well to be different, the reservoir absorbs water unevenly, the phenomena of 'inrush' and 'channeling' of injected water occur in an oil layer, the water drive control degree is directly reduced, the oil well is flooded prematurely or does not take effect, the development effect of the oil field is seriously influenced, in the prior art, the large pore throat and cracks of the oil-water well can be blocked by injecting a special chemical blocking agent into a water injection well, common blocking agents comprise inorganic salts, gel, resins and the like, but the respective disadvantages exist in the actual construction process, the prices of the inorganic salts and the gel blocking agents are high, and the construction complexity and the disadvantages of high risks also exist at the same time of the resin blocking agents are high.
Disclosure of Invention
The invention aims to provide a reversible deformation isotonic plugging regulation production increasing technology for a high-water-content oil-water well, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a reversible deformation isotonic plugging regulation production increase method for a high water-cut oil-water well comprises the following steps:
(1) Adding 0.3-0.5 wt% of thermoplastic resin MH-036 as the oil-extraction water-plugging agent into water under stirring, and stirring for 5 minutes to obtain an aqueous solution of the thermoplastic resin MH-036 as the oil-extraction water-plugging agent;
(2) Adding 8-15% mass ratio of oil extraction water plugging agent polyisoprene elastic particles MH-035 into oil extraction water plugging agent thermoplastic resin MH-036 aqueous solution to form stable glue solution;
(3) The glue solution in the step (2) is quickly injected into a fracturing truck set for an oil well, the oil recovery water plugging agent polyisoprene elastic particles MH-035 are injected under the condition that sand plugging is avoided, the range of the volume ratio of the sand solution is 15-40%, and the mass concentration of the oil recovery water plugging agent polyisoprene elastic particles MH-035 in the glue solution is improved in a stepwise manner;
(4) Slowly injecting the prepared glue solution in the step (2) into a slurry pump for a water injection well, stopping the pump to pay attention to pressure change after a slug is injected, adjusting the concentration of the glue solution in time, finding out possible high, medium and low permeability layers according to a pressure change curve, and controlling the apparent viscosity value of the glue solution at 24-36mPa.s, the medium-concentration glue solution for the medium permeability layer at 0.35-0.4%, the apparent viscosity value at 48-64mPa.s, the high-concentration glue solution for the high permeability layer at 0.4-0.5% and the apparent viscosity value at 72-96mPa.s by adjusting the mass concentration of MH-036 thermoplastic resin of the oil plugging agent in the glue solution;
the water plugging agent for oil extraction, namely polyisoprene elastic particles MH-035, is a high molecular rubber copolymer, the main components of which are 80-88 percent of polyisoprene, 5-8 percent of sodium amino disulfide, 2-5 percent of zinc oxide and the balance of water in percentage by weight, the preparation method comprises the steps of adding four medicaments of polyisoprene, sodium amino disulfide, zinc oxide and water in proportion at normal temperature and normal pressure, kneading the four raw materials by a kneader to form colloid, and crushing by a crusher to obtain three specifications of particle size below 1mm, 1-2mm and 2-4 mm;
the water plugging agent thermoplastic resin MH-036 for oil extraction is a mixture of a macromolecular anionic polyacrylamide modified graft copolymer and a thermoplastic resin, and comprises the following main components, by weight, 15-20% of acrylamide, 6-10% of carboxymethyl starch, 12-18% of 2-acrylamide-2-methylpropanesulfonic acid, 3-8% of acrylic acid, 3-5% of chloroacetic acid, 2-3% of sodium hydroxide, 25-30% of polyvinyl butyral, and the balance of water.
Compared with the prior art, the invention has the beneficial effects that: the reversible deformation isotonic plugging-regulating yield-increasing technology for the high-water-content oil-water well has the advantages that the raw materials of the reagents used by the reversible deformation isotonic plugging-regulating yield-increasing technology are economical and easy to obtain, the reagents can be modified and synthesized through a special process, the price risk of the reagents can be met, the construction process is simple, the special precise construction is not needed, the advantages of the field operation environment are obvious, a plurality of items are reduced through the preparation work before the construction and the conventional operation steps, the preparation cost before the construction is reduced, the yield-increasing effect after the measures is obvious, and the cost performance is high.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a reversible deformation isotonic plugging regulation production increase method for a high water-cut oil-water well comprises the following steps:
(1) Adding 0.3-0.5 wt% of thermoplastic resin MH-036 as the water shutoff agent for oil extraction into water under the stirring condition, and stirring for 5 minutes to obtain an aqueous solution of the thermoplastic resin MH-036 as the water shutoff agent for oil extraction;
(2) Adding 8-15% of polyisoprene elastic particles MH-035 as the water shutoff agent for oil recovery into the thermoplastic resin MH-036 aqueous solution of the water shutoff agent for oil recovery to form a stable glue solution;
(3) The glue solution in the step (2) is quickly injected into a fracturing truck group for the oil well, and the oil production water plugging agent polyisoprene elastic particles MH-035 are injected under the condition of ensuring no sand plugging, so that the volume ratio range of the sand solution is 15-40%, and the mass concentration of the oil production water plugging agent polyisoprene elastic particles MH-035 in the glue solution is improved in a step-by-step manner;
(4) Slowly injecting the glue solution prepared in the step (2) into a mud pump for the water injection well, after the slug is injected, the pump is stopped to pay attention to the pressure change, the concentration of the glue solution is adjusted in time, possible high, medium and low permeability layers are found out according to the pressure change curve, by adjusting the mass concentration of thermoplastic resin MH-036 of the water plugging agent for oil extraction in the glue solution, controlling the mass concentration of the glue solution to be 0.3-0.35 percent, controlling the apparent viscosity value of the glue solution to be 24-36mPa.s, controlling the mass concentration of the glue solution to be 0.35-0.4 percent, controlling the apparent viscosity value of the glue solution to be 48-64mPa.s, controlling the mass concentration of the glue solution to be 0.4-0.5 percent, controlling the apparent viscosity value of the glue solution to be 72-96mPa.s, in the section of the heterogeneous stratum, the change of the flow resistance is caused by the change of the viscosity of the fluid, the equal fluidity propulsion is realized by injecting proper glue solution, the injected water is propelled uniformly, the swept area is increased, the water displacement efficiency is improved, the flooding or low efficiency caused by the finger-entering of the injected water is prevented, the glue solution prepared in the step (2) is injected into the water injection well through a slurry pump in the step (4), in the process of injection, the mass concentration of MH-035 in the glue solution is improved by adjusting the amount of MH-035 added in the step (3) in time, meanwhile, the mass concentration of MH-036 in the glue solution is reduced to meet the use requirement of the glue solution, the mass concentration of MH-036 is relatively greatly reduced by adding a large amount of MH-035 to meet the use requirement of a low-permeability layer, and the mass concentration of MH-036 is relatively slightly reduced by adding a small amount of MH-035 to meet the use requirement of a high-permeability layer;
the water plugging agent for oil extraction, namely polyisoprene elastic particles MH-035, is a high molecular rubber copolymer, the main components of which are 80-88 percent of polyisoprene, 5-8 percent of sodium amino disulfide, 2-5 percent of zinc oxide and the balance of water in percentage by weight, the preparation method comprises the steps of adding four medicaments of polyisoprene, sodium amino disulfide, zinc oxide and water in proportion at normal temperature and normal pressure, kneading the four raw materials by a kneader to form colloid, and crushing by a crusher to obtain three specifications of particle size below 1mm, 1-2mm and 2-4 mm;
the water plugging agent thermoplastic resin MH-036 for oil extraction is a mixture of a macromolecular anionic polyacrylamide modified graft copolymer and a thermoplastic resin, and comprises the following main components, by weight, 15-20% of acrylamide, 6-10% of carboxymethyl starch, 12-18% of 2-acrylamide-2-methylpropanesulfonic acid, 3-8% of acrylic acid, 3-5% of chloroacetic acid, 2-3% of sodium hydroxide, 25-30% of polyvinyl butyral, and the balance of water.
The working principle is as follows: preparing thermoplastic resin MH-036 as water solution with 0.3-0.5 wt% concentration, adding elastic polyisoprene particle MH-035 as water shutoff agent, dynamically regulating the mass ratio to 8-15 wt% to form stable glue solution, preparing the glue solution with particle size below 1mm, 1-2mm and 2-4mm, injecting the glue solution into water injection well stratum, regulating the glue solution concentration, injecting the elastic polyisoprene particle MH-035 and thermoplastic resin MH-036, according to the principle that the grain size specification of the grains in the glue solution is from low to high and the mass concentration of the grains in the glue solution is from low to high, the glue solution with the grain size specification of less than 1mm of the polyisoprene elastic grains MH-035 for oil extraction is injected firstly, the grain concentration in the glue solution is gradually increased from 5 percent to 15 percent, the glue solution with the grain size specification of 1-2mm of the polyisoprene elastic grains MH-035 for oil extraction in the glue solution is replaced if the pressure rises to be less than 2 MPa, the grain concentration in the glue solution is gradually increased from 5 percent to 15 percent, the glue solution with the grain size specification of 2-4mm of the polyisoprene elastic grains MH-035 for oil extraction in the glue solution is replaced if the pressure rises to be less than 2 MPa, the grain concentration in the glue solution is gradually increased from 5 percent to 40 percent, and the grain size specification and the concentration are considered to meet the requirements if the injection pressure rises to be 2 MPa in the above injection step, fixing the current discharge capacity, the mass concentration and the particle size specification of polyisoprene elastic particles MH-035 for oil extraction in the glue solution, in the injection process, if the injection pressure continuously rises and rises above 8 MPa, determining that the particle size specification and the concentration of the particles in the glue solution are too high, at the moment, reducing the particle size specification and the use concentration of the particles in the glue solution, re-injecting the glue solution with the particle size specification of less than 1mm, within the particle concentration range of 5-15%, after the pressure is stable, namely continuously injecting for more than 2 minutes and the rising range of the injection pressure is less than 4MPa, fixing the glue solution components at the moment, continuing to inject, and if the particle size specification of the particles in the glue solution cannot be reduced and the pressure continues to rise after the use concentration, terminating the construction, and determining that the construction is finished.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A reversible deformation isotonic plugging regulation production increase method for a high water-cut oil-water well is characterized by comprising the following steps: the method comprises the following steps:
(1) Adding 0.3-0.5 wt% of thermoplastic resin MH-036 as the oil-extraction water-plugging agent into water under stirring, and stirring for 5 minutes to obtain an aqueous solution of the thermoplastic resin MH-036 as the oil-extraction water-plugging agent;
(2) Adding 8-15% mass ratio of oil extraction water plugging agent polyisoprene elastic particles MH-035 into oil extraction water plugging agent thermoplastic resin MH-036 aqueous solution to form stable glue solution;
(3) The glue solution in the step (2) is quickly injected into a fracturing truck group for the oil well, and the oil production water plugging agent polyisoprene elastic particles MH-035 are injected under the condition of ensuring no sand plugging, so that the volume ratio range of the sand solution is 15-40%, and the mass concentration of the oil production water plugging agent polyisoprene elastic particles MH-035 in the glue solution is improved in a step-by-step manner;
(4) Slowly injecting the prepared glue solution in the step (2) into a slurry pump for a water injection well, stopping the pump to pay attention to pressure change after a slug is injected, adjusting the concentration of the glue solution in time, finding out possible high, medium and low permeability layers according to a pressure change curve, and controlling the apparent viscosity value of the glue solution at 24-36mPa.s, the medium-concentration glue solution for the medium permeability layer at 0.35-0.4%, the apparent viscosity value at 48-64mPa.s, the high-concentration glue solution for the high permeability layer at 0.4-0.5% and the apparent viscosity value at 72-96mPa.s by adjusting the mass concentration of MH-036 thermoplastic resin of the oil plugging agent in the glue solution;
the water plugging agent for oil extraction, namely polyisoprene elastic particles MH-035, is a high molecular rubber copolymer, the main components of which are 80-88 percent of polyisoprene, 5-8 percent of sodium amino disulfide, 2-5 percent of zinc oxide and the balance of water in percentage by weight, the preparation method comprises the steps of adding four medicaments of polyisoprene, sodium amino disulfide, zinc oxide and water in proportion at normal temperature and normal pressure, kneading the four raw materials by a kneader to form colloid, and crushing by a crusher to obtain three specifications of particle size below 1mm, 1-2mm and 2-4 mm;
the water plugging agent thermoplastic resin MH-036 for oil extraction is a mixture of a macromolecular anionic polyacrylamide modified graft copolymer and a thermoplastic resin, and comprises the following main components, by weight, 15-20% of acrylamide, 6-10% of carboxymethyl starch, 12-18% of 2-acrylamide-2-methylpropanesulfonic acid, 3-8% of acrylic acid, 3-5% of chloroacetic acid, 2-3% of sodium hydroxide, 25-30% of polyvinyl butyral, and the balance of water.
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| US3502149A (en) * | 1967-04-07 | 1970-03-24 | Dow Chemical Co | Sealing composition and method of use thereof |
| CN110922948B (en) * | 2018-09-20 | 2022-03-29 | 中国石油天然气股份有限公司 | Water shutoff agent and preparation method thereof |
| CN109810682B (en) * | 2019-03-12 | 2020-09-29 | 中国石油大学(华东) | Hot-melt plugging agent, drilling fluid, preparation method and application thereof |
| CN110105933B (en) * | 2019-05-15 | 2020-05-05 | 中国石油大学(华东) | High-temperature-resistant core/shell structure gel particle plugging agent and preparation method and application thereof |
| CN110591676A (en) * | 2019-09-30 | 2019-12-20 | 中国石油集团渤海钻探工程有限公司 | Temperature-sensitive expandable shape memory plugging agent, and preparation method and application thereof |
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Effective date of registration: 20221207 Address after: 138000 Kalunfangzi Village, Songyuan Economic and Technological Development Zone, Jilin Province Patentee after: Songyuan Minghua Petroleum Engineering Technology Service Co.,Ltd. Address before: 138000 Helqile Village, Songyuan Economic and Technological Development Zone, Jilin Province Patentee before: Jilin Rongpuda Petroleum Technology Co.,Ltd. |
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