CN115703960A - Degradable polymer temporary plugging agent and preparation method thereof - Google Patents
Degradable polymer temporary plugging agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a degradable polymer temporary plugging agent and a preparation method thereof, wherein the degradable polymer temporary plugging agent comprises the following components in percentage by mass (55-75): (25-45) first temporary plugging particles and second temporary plugging particles. When the temporary plugging agent reaches a stratum plugging part for temporary plugging, the first temporary plugging particles can be crosslinked to form a compact temporary plugging layer, the polyester elastomer in the second temporary plugging particle system has certain flexibility under the action of the compatilizer, under the combined action of the plasticizer and the lubricant, the second temporary plugging particles can resist high temperature under the action of the underground stratum and can be properly deformed and locally crosslinked with the crosslinked first temporary plugging particles, the mechanical strength of the temporary plugging layer is improved, the compressive strength of the temporary plugging layer is further improved, plugging for a long time is realized, the biological enzyme is released along with the biological enzyme capsule gel breaker to degrade the high-viscosity temporary plugging layer into clear liquid with lower viscosity, the viscosity of the second temporary plugging particles is reduced, and the second temporary plugging particles can be returned along with the stratum fluid.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a temporary plugging agent of a degradable polymer and a preparation method thereof.
Background
Oil and gas resources such as oil and gas are produced by exploiting wells (oil wells or gas wells, which may be collectively referred to as "wells") containing porous and permeable underground layers. However, in recent years, with continuous production of oil and gas fields, the quality of reservoirs is gradually reduced year by year, and for this reason, related oil and gas production mostly adopts a reservoir fracturing modification mode to improve the permeability of underground reservoirs so as to continuously and effectively extract oil and gas resources from the underground reservoirs. However, at present, for a heterogeneous low-permeability oil reservoir with the characteristics of relatively dispersed longitudinal distribution, more oil reservoirs, serious longitudinal heterogeneity and the like, balanced reformation often cannot be realized by adopting multilayer general fracturing reformation. In order to replace the conventional multi-layer general fracturing technology to some extent, more and more researchers have studied the temporary blocking diversion fracturing technology aiming at fracture diversion.
The temporary blocking and steering fracturing technology is characterized by that according to the heterogeneity of reservoir stratum plane and longitudinal direction and the difference of utilization degree of different zones and layer positions, in the course of fracturing construction the temporary blocking material can be added in real time, and the old fracture or sand fracture can be temporarily blocked, and the change of fracture pressure and fracture extension pressure can be used to make fluid produce steering so as to form new artificial fracture (hereinafter referred to as "new fracture") to open new oil-gas seepage channel, so that it can make the reservoir stratum with low utilization degree or even unused so as to attain the goal of increasing production.
But the prior temporary plugging agent series products have the problems of small compressive strength and difficult degradation and flowback after construction.
Disclosure of Invention
In order to improve the compressive strength of the temporary plugging agent and solve the problems that the temporary plugging agent is not easy to degrade and flowback after construction, the invention provides a degradable polymer temporary plugging agent and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a temporary plugging agent of degradable polymer comprises a first temporary plugging particle and a second temporary plugging particle, wherein the mass ratio of the first temporary plugging particle to the second temporary plugging particle is (55-75): (25 to 45).
Further, the first temporary plugging particles comprise the following components in parts by weight: 40 to 50 parts of alkyd resin, 2 to 10 parts of lubricant, 1 to 6 parts of plasticizer, 0.5 to 1.5 parts of biological enzyme capsule gel breaker and 60 to 90 parts of water.
Further, the second temporary plugging particles comprise the following components in parts by weight: 20-30 parts of polyester elastomer, 2-10 parts of lubricant, 2-8 parts of plasticizer, 2-8 parts of compatilizer and 50-80 parts of water.
Further, the lubricant is polyethylene wax.
Further, the plasticizer is one or two of citric acid ether ester and isosorbide di-n-hexanoate.
Further, the compatilizer is maleic anhydride grafted styrene copolymer.
Further, the biological enzyme capsule gel breaker is prepared from solid particles, biological enzymes and a capsule coating according to the weight ratio of 80: (6-10): (210-250) in a mass ratio. The coating coats the biological enzyme, and the biological enzyme is loaded on the solid particles.
Further, the biological enzyme is preferably galactomannanase; the solid particles are preferably ammonium persulfate; the coating is preferably a vinyl chloride-vinylidene chloride copolymer.
Further, the preparation method of the biological enzyme capsule gel breaker comprises the following steps:
a. uniformly mixing the solid particles and the biological enzyme in proportion to obtain a mixture;
b. dissolving the capsule coat in ethanol solution to obtain capsule coat solution;
c. and (b) placing the mixture obtained in the step a in a fluidized bed granulating and coating machine, adding the capsule coating solution obtained in the step b into a liquid reservoir of the fluidized bed granulating and coating machine, starting an air compressor, controlling the air pressure in the fluidized bed granulating and coating machine to be 0.35-0.4 MPa, controlling the internal temperature of the fluidized bed granulating and coating machine to be 35-37 ℃, spraying the capsule coating solution on the mixture at the flow rate of 4-6L/h through a peristaltic pump until the capsule coating solution is completely sprayed, keeping the mixture to circularly fly up and down for 2-4 h until the particle size of the mixture particles is increased to 0.1-0.2 mm, closing the air compressor, taking out the carrier particles, and drying at normal temperature to obtain the biological enzyme capsule gel breaker.
Further, the invention also provides a preparation method of the temporary plugging agent, which comprises the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, a lubricant, a plasticizer, a biological enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 100-150 ℃, cooling the plasticized first mixture to 60-70 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, a lubricant, a plasticizer, a compatilizer and water according to a ratio, placing the mixture in a mixer for blending to obtain a second blend, then placing the second blend in a plasticizing machine for plasticizing at 200-220 ℃, cooling the plasticized second blend to 60-70 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
By adopting the technical scheme, the invention has the advantages that:
1. when the temporary plugging agent reaches a stratum plugging part for temporary plugging, the first temporary plugging particles are crosslinked to form a compact temporary plugging layer, the polyester elastomer in the second temporary plugging particle system has certain flexibility under the action of the compatilizer, under the combined action of the plasticizer and the lubricant, the second temporary plugging particles can resist high temperature under the action of the underground stratum and can generate appropriate deformation and generate local crosslinking with the crosslinked first temporary plugging particles, the mechanical strength of the temporary plugging layer is improved, the compressive strength of the temporary plugging layer is further improved, plugging for a long time is realized, the biological enzyme is released along with the biological enzyme capsule gel breaker to degrade the high temporary plugging layer into clear liquid with lower viscosity, the viscosity of the second temporary plugging particles is reduced, the second temporary plugging particles can be returned along with the stratum fluid, and the compressive strength of the temporary plugging agent is as high as 48MPa.
2. The raw materials used in the invention can be purchased in the market, the sources are wide and sufficient, the reaction conditions are mild, the process is relatively simple, the reactions in each step are conventional operations, and the product cost can be effectively reduced; the condition of each step in the reaction is mild, the safety is high, toxic and harmful substances are not generated, and the method is green and environment-friendly and is easy to popularize and apply on a large scale.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a more thorough understanding of the present invention.
Detailed Description
The invention will be further understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein.
The invention provides a degradable polymer temporary plugging agent, which is a mixture of first temporary plugging particles and second temporary plugging particles; the mass ratio of the first temporary plugging particles to the second temporary plugging particles is (55-75): (25 to 45). The content of the first temporary plugging particles is higher than that of the second temporary plugging particles, so that a relatively dense cross-linking layer with certain bearing strength can be formed in the plugging process, and the cross-linking layer is stably cross-linked with the second temporary plugging particles.
In one embodiment of the present invention, the first temporary plugging particles are further prepared from the following components in parts by weight: 40 to 50 parts of alkyd resin, 2 to 10 parts of lubricant, 1 to 6 parts of plasticizer, 0.5 to 1.5 parts of biological enzyme capsule gel breaker and 60 to 90 parts of water.
In another embodiment of the present invention, the second temporary plugging particles are further prepared from the following components in parts by weight: 20-30 parts of polyester elastomer, 2-10 parts of lubricant, 2-8 parts of plasticizer, 2-8 parts of compatilizer and 50-80 parts of water. The polyester elastomer in the second temporary plugging particle system has certain flexibility under the action of the compatilizer, and under the combined action of the plasticizer and the lubricant, the second temporary plugging particles can resist high temperature under the action of an underground stratum, can be properly deformed and can be locally crosslinked with the crosslinked first temporary plugging particles, so that the mechanical strength of the temporary plugging layer is improved, the compressive strength of the temporary plugging layer is further improved, and plugging for a long time is realized.
In a preferred embodiment, the plasticizer is one or both of an ether citrate ester and an isosorbide di-n-hexanoate ester.
In another preferred embodiment, the lubricant is a polyethylene wax.
In another preferred embodiment, the compatibilizing agent is a maleic anhydride grafted styrene copolymer.
In another embodiment of the invention, the biological enzyme capsule breaker is prepared from solid particles, biological enzymes and a capsule coating, wherein the mass ratio of the solid particles to the biological enzymes is 80: (6-10): (210-250) in a mass ratio. The biological enzyme is preferably galactomannanase; the solid particles are preferably ammonium persulfate; the coating is preferably a vinyl chloride-vinylidene chloride copolymer.
Further, the coating encapsulates the biological enzyme, which is supported on solid particles. In the biological enzyme capsule gel breaker, ammonium persulfate is used as a carrier, so that biological enzyme can be loaded, and the ammonium persulfate can also break the gel, thereby improving the gel breaking capability of the biological enzyme capsule gel breaker.
In another embodiment of the invention, the biological enzyme capsule breaker is prepared by the following steps:
a. uniformly mixing the solid particles and the biological enzyme in proportion to obtain a mixture;
b. dissolving the capsule coat in ethanol solution to obtain capsule coat solution;
c. and (b) placing the mixture obtained in the step a in a fluidized bed granulating and coating machine, adding the capsule coating solution obtained in the step b into a liquid reservoir of the fluidized bed granulating and coating machine, starting an air compressor, controlling the air pressure in the fluidized bed granulating and coating machine to be 0.35-0.4 MPa, controlling the internal temperature of the fluidized bed granulating and coating machine to be 35-37 ℃, spraying the capsule coating solution on the mixture at the flow rate of 4-6L/h through a peristaltic pump until the capsule coating solution is completely sprayed, keeping the mixture to circularly fly up and down for 2-4 h until the particle size of the mixture particles is increased to 0.1-0.2 mm, closing the air compressor, taking out the carrier particles, and drying at normal temperature to obtain the biological enzyme capsule gel breaker.
The invention also provides a preparation method of the temporary plugging agent for the degradable polymer, which comprises the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, a lubricant, a plasticizer, a biological enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 100-150 ℃, cooling the plasticized first mixture to 60-70 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, a lubricant, a plasticizer, a compatilizer and water according to a ratio, placing the mixture in a mixer for blending to obtain a second blend, then placing the second blend in a plasticizing machine for plasticizing at 200-220 ℃, cooling the plasticized second blend to 60-70 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
The following detailed description of the preferred embodiments of the invention is provided to illustrate the principles of the invention and not to limit the scope of the invention.
It should be noted that the implementation conditions used in the following examples may be further adjusted according to specific experimental environments, and the implementation conditions not mentioned are generally the conditions in routine experiments. All starting materials mentioned in the following examples were obtained from published commercial sources unless otherwise specified.
The bio-enzyme capsule breaker in the following examples is prepared by the following steps:
a) According to the mass ratio of ammonium persulfate to galactomannase to vinyl chloride-vinylidene chloride copolymer of 80:6:210 preparing the corresponding components;
b) Uniformly mixing ammonium persulfate and galactomannase according to the proportion to obtain a mixture; dissolving a chloroethylene-vinylidene chloride copolymer in an ethanol solution to obtain a capsule coating solution;
c) Placing the mixture in a fluidized bed granulating and coating machine, adding the capsule coating solution into a liquid reservoir of the fluidized bed granulating and coating machine, starting an air compressor, controlling the air pressure in the fluidized bed granulating and coating machine to be 0.4MPa and the internal temperature of the fluidized bed granulating and coating machine to be 35 ℃, spraying the capsule coating solution on the mixture at the flow rate of 6L/h through a peristaltic pump until the capsule coating solution is completely sprayed, and keeping the mixture to circularly fly up and down for 3 hours until the particle size of the mixture particles is increased to 0.1-0.2 mm.
Example 1
The embodiment provides a temporary plugging agent, wherein the temporary plugging agent is a mixture of first temporary plugging particles and second temporary plugging particles, and the mass ratio of the first temporary plugging particles to the second temporary plugging particles is 55:45.
further, the first temporary plugging particles are prepared from the following components in parts by weight: 50 parts of alkyd resin, 2 parts of polyethylene wax, 1 part of citric acid ether ester, 1.5 parts of biological enzyme capsule gel breaker and 90 parts of water; the second temporary plugging particles are prepared from the following components in parts by weight: 20 parts of polyester elastomer, 5 parts of polyethylene wax, 3 parts of isosorbide di-n-hexanoate, 4 parts of maleic anhydride grafted styrene copolymer and 60 parts of water.
The embodiment also includes a preparation method of the temporary plugging agent, which comprises the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, polyethylene wax, citric acid ether ester, a biological enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 100 ℃, cooling the plasticized first mixture to 60 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, polyethylene wax, isosorbide di-n-hexanoate, a maleic anhydride grafted styrene copolymer and water according to a ratio, placing the mixture into a mixer for blending to obtain a second blend, then placing the second blend into a plasticizing machine for plasticizing at 200 ℃, cooling the plasticized second blend to 70 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
Example 2
The embodiment provides a temporary plugging agent, wherein the temporary plugging agent is a mixture of first temporary plugging particles and second temporary plugging particles, and the mass ratio of the first temporary plugging particles to the second temporary plugging particles is 65:35.
the first temporary plugging particles are prepared from the following components in parts by weight: 40 parts of alkyd resin, 5 parts of polyethylene wax, 6 parts of isosorbide di-n-hexanoate, 0.5 part of biological enzyme capsule gel breaker and 90 parts of water; the second temporary plugging particles are prepared from the following components in parts by weight: 25 parts of polyester elastomer, 10 parts of polyethylene wax, 6 parts of isosorbide di-n-hexanoate, 6 parts of maleic anhydride grafted styrene copolymer and 60 parts of water.
The embodiment also includes a preparation method of the temporary plugging agent, which comprises the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, polyethylene wax, isosorbide di-n-hexanoate, a bio-enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 100 ℃, cooling the plasticized first mixture to 60 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, polyethylene wax, citric acid ether ester, a maleic anhydride grafted styrene copolymer and water according to a ratio, placing the mixture in a mixer for blending to obtain a second blend, then placing the second blend in a plasticizing machine for plasticizing at 200 ℃, cooling the plasticized second blend to 70 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
Example 3
The embodiment provides a temporary plugging agent, which is a mixture of first temporary plugging particles and second temporary plugging particles, wherein the mass ratio of the first temporary plugging particles to the second temporary plugging particles is 75:25.
the first temporary plugging particles are prepared from the following components in parts by weight: 45 parts of alkyd resin, 10 parts of polyethylene wax, 1 part of citric acid ether ester, 1 part of biological enzyme capsule gel breaker and 80 parts of water; the second temporary plugging particles are prepared from the following components in parts by weight: 25 parts of polyester elastomer, 2 parts of polyethylene wax, 8 parts of citric acid ether ester, 2 parts of maleic anhydride grafted styrene copolymer and 60 parts of water.
The embodiment also includes a preparation method of the temporary plugging agent, which comprises the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, polyethylene wax, citric acid ether ester, a biological enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 120 ℃, cooling the plasticized first mixture to 65 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, polyethylene wax, citric acid ether ester, a maleic anhydride grafted styrene copolymer and water according to a ratio, placing the mixture in a mixer for blending to obtain a second blend, then placing the second blend in a plasticizing machine for plasticizing at 210 ℃, cooling the plasticized second blend to 60 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
Example 4
The present embodiment differs from embodiment 3 only in the different mixture ratios of the components and the same preparation method, specifically, in the temporary plugging agent of the present embodiment, the mass ratio of the first temporary plugging particles to the second temporary plugging particles is 75:25.
the first temporary plugging particles are prepared from the following components in parts by weight: 42 parts of alkyd resin, 5 parts of polyethylene wax, 5 parts of citric acid ether ester, 1.5 parts of bio-enzyme capsule gel breaker and 70 parts of water;
the second temporary plugging particles are prepared from the following components in parts by weight: 30 parts of polyester elastomer, 5 parts of polyethylene wax, 7 parts of citric acid ether ester, 3 parts of maleic anhydride grafted styrene copolymer and 70 parts of water.
Comparative example 1
The comparative example differs from example 1 in that the temporary plugging agent of the comparative example only comprises first temporary plugging particles, which are prepared from the following components in parts by weight: 50 parts of alkyd resin, 2 parts of polyethylene wax, 1 part of citric acid ether ester, 1.5 parts of biological enzyme capsule breaker and 90 parts of water.
Comparative example 2
The comparison example differs from example 1 in that the temporary plugging agent of the comparison example only comprises second temporary plugging particles, and the second temporary plugging particles are prepared from the following components in parts by weight: the modified polyethylene glycol modified styrene-butadiene rubber comprises 20 parts of polyester elastomer, 5 parts of polyethylene wax, 3 parts of isosorbide di-n-hexanoate, 4 parts of maleic anhydride grafted styrene copolymer and 60 parts of water.
Application example 1
The temporary plugging agents of examples 1-4, comparative example 1 and comparative example 2 were subjected to plugging tests, respectively, as follows:
step 1) mixing the temporary plugging agent with water at a wellhead, wherein the mass ratio of the temporary plugging agent to the water is 1:1000, injecting from an oil casing annulus;
step 2) firstly injecting a small amount of clear water for blocking, then replacing the mixture of the temporary plugging agent and the water in the step 1) for blocking, pushing the temporary plugging agent to the perforation section of the oil pipe, closing the well for reacting for 4-6 hours, and utilizing the delay of the temporary plugging agent, when the temporary plugging agent reaches the perforation borehole, the temporary plugging agent starts to adhere to a bridge around the perforation, so that primary filling is realized, the temporary plugging agent is prevented from leaking into the stratum, and meanwhile, the temporary plugging agent is dissolved in the underground high temperature and water environment to form a temporary plugging layer;
and 3) opening an oil pipe gate valve, reversely circulating clear water, discharging gas in the pipe column, controlling certain back pressure at the initial stage of circulating exhaust to ensure that the pressure in the pipe is greater than the formation pressure to prevent blockage removal of a temporary plugging layer under negative pressure, then gradually reducing the back pressure until the circulation is opened, discharging the gas for emptying and burning, observing the condition of clear water leakage, stopping pumping, opening a well and observing for 6 hours, wherein the leakage amount and the compressive strength are shown in Table 1.
Table 1 shows the test results of examples 1 to 4, comparative example 1 and comparative example 2
| Amount of leakage (m) 3 Day) | Compressive strength (MPa) | |
| Example 1 | 0.2 | 48 |
| Example 2 | 0.3 | 45 |
| Example 3 | 0.4 | 46 |
| Example 4 | 0.3 | 45 |
| Comparative example 1 | 0.8 | 10 |
| Comparative example 2 | 0.9 | 12 |
As can be seen from Table 1, the temporary plugging agents of examples 1-4 of the present invention formed temporary plugging layers having a small amount of leakage and a high compressive strength of up to 48MPa, while the comparative examples 1 and 2 had a large amount of leakage and a small compressive strength.
In addition, the viscosity of the gel breaking liquid of the temporary plugging agent in the embodiments 1 to 4 after gel breaking is less than 10mPa · s, so that the temporary plugging agent is hydrated and degraded and is completely discharged out of the ground through flowback, and the damage to the stratum is small. When the temporary plugging layer begins to degrade, the biological enzyme capsule gel breaker prompts the polymer to begin to degrade inside and outside simultaneously to form holes, after water permeates into the holes, the degradation of the surrounding polymer is accelerated, the degradation speed is higher when the contact area is larger, and the gel breaking time can reach 100% within 40h at the fastest speed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A degradable polymer temporary plugging agent is characterized in that: the temporary plugging agent comprises first temporary plugging particles and second temporary plugging particles, wherein the mass ratio of the first temporary plugging particles to the second temporary plugging particles is (55-75): (25 to 45).
2. The degradable polymeric temporary plugging agent of claim 1, wherein: the first temporary plugging particles comprise the following components in parts by weight: 40 to 50 parts of alkyd resin, 2 to 10 parts of lubricant, 1 to 6 parts of plasticizer, 0.5 to 1.5 parts of biological enzyme capsule gel breaker and 60 to 90 parts of water.
3. The degradable polymeric temporary plugging agent of claim 1, wherein: the second temporary plugging particles comprise the following components in parts by weight: 20-30 parts of polyester elastomer, 2-10 parts of lubricant, 2-8 parts of plasticizer, 2-8 parts of compatilizer and 50-80 parts of water.
4. A degradable polymer temporary plugging agent according to claim 2 or 3 wherein: the lubricant is polyethylene wax.
5. A degradable polymer temporary plugging agent according to claim 2 or 3 wherein: the plasticizer is one or a mixture of citric acid ether ester and isosorbide di-n-hexanoate.
6. The degradable polymeric temporary plugging agent of claim 2 wherein: the biological enzyme capsule gel breaker is prepared from solid particles, biological enzyme and capsule coating, wherein the solid particles comprise the following components in percentage by weight of 80: (6-10): (210-250) in a mass ratio.
7. The degradable polymeric temporary plugging agent of claim 6 wherein: the biological enzyme is galactomannanase; the solid particles are ammonium persulfate; the capsule coat is a chloroethylene-vinylidene chloride copolymer.
8. The temporary plugging agent of claim 6, wherein said bio-enzyme capsule gel breaker is prepared by a process comprising the steps of
Uniformly mixing the solid particles and the biological enzyme in proportion to obtain a mixture;
dissolving the capsule coat in ethanol solution to obtain capsule coat solution;
and (b) placing the mixture obtained in the step a in a fluidized bed granulating and coating machine, adding the capsule coating solution obtained in the step b into a liquid reservoir of the fluidized bed granulating and coating machine, starting an air compressor, controlling the air pressure in the fluidized bed granulating and coating machine to be 0.35-0.4 MPa, controlling the internal temperature of the fluidized bed granulating and coating machine to be 35-37 ℃, spraying the capsule coating solution on the mixture at the flow rate of 4-6L/h through a peristaltic pump until the capsule coating solution is completely sprayed, keeping the mixture to circularly fly up and down for 2-4 h until the particle size of the mixture particles is increased to 0.1-0.2 mm, closing the air compressor, taking out the carrier particles, and drying at normal temperature to obtain the biological enzyme capsule gel breaker.
9. The degradable polymeric temporary plugging agent of claim 3, wherein: the compatilizer is maleic anhydride grafted styrene copolymer.
10. The preparation method of the temporary plugging agent of the degradable polymer is characterized by comprising the following steps:
s1, preparing first temporary plugging particles: mixing alkyd resin, a lubricant, a plasticizer, a biological enzyme capsule gel breaker and water according to a ratio, placing the mixture in a mixer for blending to obtain a first mixture, then placing the first mixture in a plasticizing machine for plasticizing at 100-150 ℃, cooling the plasticized first mixture to 60-70 ℃, and then extruding and pelletizing to obtain first temporary plugging particles;
s2, preparing second temporary plugging particles; mixing a polyester elastomer, a lubricant, a plasticizer, a compatilizer and water according to a ratio, placing the mixture in a mixer for blending to obtain a second blend, then placing the second blend in a plasticizing machine for plasticizing at 200-220 ℃, cooling the plasticized second blend to 60-70 ℃, and then extruding and pelletizing to obtain second temporary plugging particles;
and S3, mixing the first temporary plugging particles and the second temporary plugging particles to obtain the temporary plugging agent.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160298017A1 (en) * | 2013-11-15 | 2016-10-13 | Kureha Corporation | Temporary plugging agent for well drilling |
| CN107573920A (en) * | 2017-10-18 | 2018-01-12 | 中国石油化工股份有限公司 | A kind of biology enzyme capsule breaker and preparation method thereof |
| CN111690391A (en) * | 2020-07-03 | 2020-09-22 | 北京金圣奥能源技术有限公司 | High-temperature-resistant tough degradable temporary plugging agent and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160298017A1 (en) * | 2013-11-15 | 2016-10-13 | Kureha Corporation | Temporary plugging agent for well drilling |
| CN107573920A (en) * | 2017-10-18 | 2018-01-12 | 中国石油化工股份有限公司 | A kind of biology enzyme capsule breaker and preparation method thereof |
| CN111690391A (en) * | 2020-07-03 | 2020-09-22 | 北京金圣奥能源技术有限公司 | High-temperature-resistant tough degradable temporary plugging agent and preparation method thereof |
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