CN113072919A - Shielding temporary plugging agent and preparation method and application thereof - Google Patents
Shielding temporary plugging agent and preparation method and application thereof Download PDFInfo
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- CN113072919A CN113072919A CN202010011469.0A CN202010011469A CN113072919A CN 113072919 A CN113072919 A CN 113072919A CN 202010011469 A CN202010011469 A CN 202010011469A CN 113072919 A CN113072919 A CN 113072919A
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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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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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
Abstract
The invention provides a shielding temporary plugging agent and a preparation method and application thereof, wherein the shielding temporary plugging agent comprises the following components: a) a temporary blocking material, b) a first modifier, c) a second modifier and d) a solvent, wherein the first modifier is selected from one or more of fatty acid, fatty alcohol and fatty acid ester; the second modifier is selected from one or more of alkane and silicone oil. The shielding temporary plugging agent disclosed by the invention has the physical-chemical dual functions of increasing the additional pressure of the filtrate through physical plugging-hydrophobic modification, so that the leakage rate of the drilling fluid in cracks and pores is reduced, and the purposes of reducing the leakage amount and improving the shielding temporary plugging effect are achieved.
Description
Technical Field
The invention relates to a shielding temporary plugging agent and a preparation method and application thereof.
Background
In the drilling process, the shielding temporary plugging technology can effectively avoid fluid loss and effectively protect a reservoir, and the like, and is widely applied in recent years. In order to enhance the plugging capability of the drilling fluid on permeable formations, the most commonly used method is physical bridging. The temporary plugging material used for physical bridge plugging is characterized in that the permeability of a plugging layer is reduced due to the fact that the existing solid-phase particle plugging agent in a drilling fluid system enters a stratum, an effective shielding ring is formed in the front of a reservoir stratum, the reservoir stratum is prevented from being further damaged, the plugging can be effectively removed during production, and the permeability of the reservoir stratum is recovered, so that the reservoir stratum is effectively protected.
The commonly used plugging materials at present comprise high-water-loss plugging materials (such as percolation materials, fibrous materials, diatomite, porous inert materials, filter aids, coagulant and the like), hard-soft plugging materials, inorganic gelling plugging agents, temporary plugging materials, chemical plugging materials, high-temperature plugging materials, composite plugging materials, bridging materials and the like. The conventional bridging material has a good application effect in the actual use process, but also has some problems. For example, the non-deformable materials (such as mica and the like) utilize high concentration of solid particles with certain particle size distribution to generate bridging and blocking effects at cracks, but the high concentration of solid phase particles has obvious influence on the rheological property of the drilling fluid; the solid-phase particle shielding temporary plugging of the reservoir requires that the particle size is matched with the cracks or gaps of the stratum, but the effective matching of the exploratory well or the stratum with unknown widths of the cracks and the gaps is difficult to achieve. Bitumen temporary plugging materials usually have fluorescence, interfere with subsequent logging, and affect accurate judgment of reservoirs.
From the application status of the shielding temporary plugging material, the current shielding temporary plugging material is mainly subjected to physical plugging through particle size distribution and by virtue of material properties such as particle shape, material elasticity and the like.
Disclosure of Invention
The invention aims to solve the technical problem that in the prior art, solid-phase particle shielding temporary plugging of a reservoir requires matching of particle size with formation cracks or gaps, but effective matching of exploratory wells or formations with unknown widths of cracks and gaps is difficult to achieve, and provides a shielding temporary plugging agent, and a preparation method and application thereof.
In order to solve the above technical problems, a first aspect of the present invention provides a shielding temporary plugging agent, which comprises the following components or is prepared from the following raw materials:
a) a temporary blocking material, b) a first modifier, c) a second modifier, and d) a solvent; wherein the first modifier is selected from one or more of fatty acid, fatty alcohol and fatty acid ester, and the second modifier is selected from one or more of alkane and silicone oil.
According to some embodiments of the present invention, the shielding temporary plugging agent comprises the following components in parts by weight: 1-50 parts of temporary plugging material, 0.1-5.0 parts of first modifier, 0.1-5.0 parts of second modifier and 100 parts of solvent.
According to some embodiments of the invention, the weight ratio of the first modifier to the second modifier is from 0.5 to 3.0, preferably from 0.8 to 2.8.
According to some embodiments of the invention, the solvent is selected from one or more of C2-C8 alcohols, C3-C6 ketones, and C4-C8 alkanes.
According to some embodiments of the invention, the C2-C8 alcohol is one or more of methanol, ethanol, isopropanol, n-butanol, and tert-butanol, preferably methanol or ethanol. According to some embodiments of the invention, the C3-C6 ketone is one or more of acetone, butanone, pentanone, and methyl ethyl ketone, preferably acetone. According to some embodiments of the invention, the C4-C8 alkane is one or more of pentane, hexane, heptane, and octane, preferably petroleum ether.
According to some embodiments of the invention, the temporary plugging material is selected from at least one of insoluble carbonate rock, limestone, dolomite, dolomitic limestone and dolomitic limestone, preferably carbonate rock fines.
According to some embodiments of the invention, the first modifier is selected from one or more of C6-C24 fatty acids, C6-C18 fatty acid esters, C6-C18 alcohols, and C12-C18 alcohol esters, preferably one or more of C10-C20 fatty acids, C6-C12 fatty acid esters, and C6-C12 alcohols.
According to some embodiments of the invention, the C6-C18 alcohol is a saturated alcohol containing substituents selected from one or more of halogen, hydroxy, methyl, ethyl, n-propyl, and isopropyl.
According to some embodiments of the present invention, the second modifier is selected from one or more of C10-C20 alkane, liquid paraffin, hydroxy silicone oil, C1-C2 alkyl silicone oil, dimethyl silicone oil, hydroxypropyl silicone oil and benzyl silicone oil, preferably methyl silicone oil or alkane with a carbon chain length of C8-C16.
According to some embodiments of the invention, the C10-C20 alkane is an alkane containing a substituent selected from one or more of halogen, hydroxy, methyl, ethyl, n-propyl, and isopropyl.
The second aspect of the present invention provides a method for preparing the shielding temporary plugging agent, comprising the following steps:
1) mixing and heat treating the temporary plugging material, the first modifier, the second modifier and the solvent,
2) subjecting the mixture after the heat treatment of step 1) to solid-liquid separation, and drying the solid thus obtained.
According to some embodiments of the present invention, the heat treatment temperature is 40 to 60 ℃ and the heat treatment time is 2 to 6 hours.
According to some embodiments of the present invention, the drying temperature is 50 to 80 ℃ and the drying time is 2 to 8 hours.
According to some embodiments of the present invention, the method for preparing the shielding temporary plugging agent comprises the following steps:
firstly, adding a certain amount of solvent into a reaction kettle, then adding a certain amount of temporary plugging material, sequentially adding a first modifier and a second modifier under a stirring state, filling nitrogen into the reaction kettle, sealing, heating under a sealing state, reacting for a certain time, taking out the temporary plugging agent from the reaction kettle, performing suction filtration and drying to obtain the shielding temporary plugging agent.
According to some embodiments of the present invention, the preparation method of the shielding temporary plugging agent comprises the following specific steps:
firstly, adding 100 parts by weight of solvent into a reaction kettle, then adding 2-30 parts by weight of temporary plugging material, sequentially adding a first modifier and a second modifier under a stirring state, filling nitrogen into the reaction kettle for 10-20 min, sealing, heating to 40-60 ℃ under a sealing state, reacting for 2-6 h, taking out a reactant from the reaction kettle, performing suction filtration, and drying at 50-80 ℃ for 2-8 h to obtain the temporary shielding plugging agent.
In a third aspect of the present invention, there is provided the use of the temporary shielding plugging agent or the temporary shielding plugging agent prepared by the above preparation method in an oilfield drilling fluid, preferably, the temporary shielding plugging agent has a contact angle of 40 ° to 80 °.
The shielding temporary plugging agent has stronger hydrophobicity, can increase the flow resistance of the filtrate of the water-based drilling fluid in pores and cracks, namely, the leakage speed of the drilling fluid in the cracks and the pores is reduced through the physical-chemical dual action of increasing the additional pressure of the filtrate through physical plugging-hydrophobic modification, and the purposes of reducing the leakage amount and improving the shielding temporary plugging effect are achieved.
Has the advantages that:
1. the shielding temporary plugging agent for plugging the drilling fluid has good plugging effect on permeable and fractured stratums. Compared with the shielding temporary plugging agent with the same material and particle size grading, the shielding temporary plugging agent can play a role in enhancing the plugging effect on stratums with different crack widths and pore throat sizes, and meanwhile, the shielding temporary plugging agent has good compatibility with other treating agents of a drilling fluid system, and can meet the requirement of shielding temporary plugging of stratums at the temperature of 150 ℃.
2. The invention reduces the leakage speed of the drilling fluid in cracks and pores by improving the surface property of the plugging material, thereby achieving the purposes of reducing the leakage amount and improving the shielding temporary plugging effect. The shielding temporary plugging agent has good effects of reducing filtration, lubricating and inhibiting mud shale expansion, and is beneficial to reducing the filtration loss of water-based drilling fluid to a stratum.
Detailed Description
The present invention will be further described with reference to the following examples. However, the present invention is not limited to these examples.
In the following examples, the primary calcium carbonate refers to a calcium carbonate material before modification, such as limestone, dolomite limestone powder, etc., and the modified calcium carbonate refers to a product obtained by modifying calcium carbonate with the first modifier and the second modifier of the present invention; the wettability of the particle surface was tested according to the test methods described in the documents X.Dong, L.Wang, X.Yang, Y.Lin, Y.Xue.Effect of ester based coatings SMJH-1 on the coating based wetting of coating based wetting, journal of Petroleum Science and Engineering 135(2015)161 + 167.
The first modifying agents used in the following examples do not contain halogen unless otherwise specified.
The following examples of batyl stearate were purchased from solar chemical trade (shanghai) ltd, dimethicone from boyang silicone new material ltd, shenzhen, palmitic acid from shanghai specialization chemical ltd, C14-C18 liquid paraffin from jinhui wax products factory, dongguan county, dodecanol from shanghai specialization chemical ltd, silicone oil from aike chemical agents ltd, C8-C12 alkane from yunzhou yutian chemical plants, C12-C14 alcohol ester (2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate) from shangyang high tech development ltd, and hydroxypropyl silicone oil from arantin agents ltd.
Example 1
The shielding temporary plugging agent of the embodiment is prepared by the following method:
firstly, adding 100 parts by weight of ethanol into a reaction kettle, then adding 3 parts by weight of calcium carbonate, sequentially adding 0.25 part by weight of a first modifier (batyl alcohol stearate) and 0.3 part by weight of a second modifier (dimethyl silicone oil) under a stirring state, filling nitrogen into the reaction kettle for 10min, sealing, heating to 40 ℃ under a sealed state, reacting for 2.5h, taking out a mixture from the reaction kettle, carrying out suction filtration, and drying at 50 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 1.
Wherein, after the shielding temporary plugging agent is modified by the first modifier and the second modifier, the surface contact angle is 60-80 degrees.
Table 1 example 1 blocking effect of a blocking temporary blocking agent
Example 2
The shielding temporary plugging agent of the embodiment is prepared by the following method:
firstly, adding 100 parts by weight of acetone into a reaction kettle, then adding 16 parts by weight of calcium magnesium carbonate, sequentially adding 1.7 parts by weight of a first modifier (palmitic acid) and 2.1 parts by weight of a second modifier (C14-C18 liquid paraffin) under a stirring state, filling nitrogen into the reaction kettle for 15min, sealing, heating to 50 ℃ under a sealing state, reacting for 4h, taking out a mixture from the reaction kettle, performing suction filtration, and drying at 55 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 2.
Wherein, after the shielding temporary plugging agent is modified by the first modifier and the second modifier, the surface contact angle is 75-95 degrees.
Table 2 example 2 blocking effect of the masking temporary blocking agent
Example 3
The shielding temporary plugging agent of the embodiment is prepared by the following method:
firstly, adding 100 parts by weight of hexane into a reaction kettle, then adding 28 parts by weight of calcium silicate, sequentially adding 3.8 parts by weight of a first modifier (dodecanol) and 3.4 parts by weight of a second modifier (silicone oil) under a stirring state, filling nitrogen into the reaction kettle for 20min, sealing, heating to 55 ℃ under a sealing state, reacting for 5h, taking out a mixture from the reaction kettle, carrying out suction filtration, and drying at 60 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 3.
Wherein, after the shielding temporary plugging agent is modified by the first modifier and the second modifier, the surface contact angle is 90-110 degrees.
Table 3 example 3 blocking effect of the masking temporary blocking agent
Example 4
The embodiment provides a shielding temporary plugging agent and a preparation method thereof, wherein the shielding temporary plugging agent comprises the following components:
28 parts by weight of calcium silicate, 3.8 parts by weight of a first modifier (dodecanol), 1.4 parts by weight of a second modifier (C8-C12 alkane) and 100 parts by weight of hexane.
The shielding temporary plugging agent of the embodiment is prepared by the following method:
firstly, adding 100 parts by weight of hexane into a reaction kettle, then adding 28 parts by weight of calcium silicate, sequentially adding 3.8 parts by weight of a first modifier (dodecanol) and 1.4 parts by weight of a second modifier (C8-C12 alkane) under a stirring state, filling nitrogen into the reaction kettle for 20min, sealing, heating to 55 ℃ under a sealed state, reacting for 5h, taking out a mixture from the reaction kettle, performing suction filtration, and drying at 60 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 4.
Wherein, after the shielding temporary plugging agent is modified by the first modifier and the second modifier, the surface contact angle is 80-92 degrees.
Table 4 example 4 blocking effect of the masking temporary blocking agent
Example 5
The shielding temporary plugging agent of the embodiment is prepared by the following method:
firstly, adding 100 parts by weight of petroleum ether into a reaction kettle, then adding 26 parts by weight of calcium magnesium carbonate, sequentially adding 2.5 parts by weight of a first modifier (C12-C14 alcohol ester) and 2.9 parts by weight of a second modifier (hydroxypropyl silicone oil) under a stirring state, filling nitrogen into the reaction kettle for 10min, sealing, heating to 50 ℃ under a sealing state, reacting for 4h, taking out the mixture from the reaction kettle, performing suction filtration, and drying at 65 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 5.
Wherein, after the shielding temporary plugging agent is modified by the first modifier and the second modifier, the surface contact angle is 99-116 degrees.
Table 5 example 5 blocking effect of the masking temporary blocking agent
Comparative example 1
The shielding temporary plugging agent of the comparative example is prepared by the following method:
firstly, adding 100 parts by weight of petroleum ether into a reaction kettle, then adding 26 parts by weight of calcium magnesium carbonate, adding 2.5 parts by weight of a first modifier (C12-C14 alcohol ester) under a stirring state, filling nitrogen into the reaction kettle for 10min, then sealing, heating to 50 ℃ under a sealing state, reacting for 4h, taking out a mixture from the reaction kettle, carrying out suction filtration, and drying at 65 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 6.
Wherein, after the shielding temporary plugging agent is modified by the first modifier, the surface contact angle is 70-80 degrees.
TABLE 6 blocking effect of shielding temporary plugging agent of comparative example 1
Comparative example 2
The shielding temporary plugging agent of the comparative example is prepared by the following method:
firstly, adding 100 parts by weight of petroleum ether into a reaction kettle, then adding 26 parts by weight of calcium magnesium carbonate, adding 2.9 parts by weight of a second modifier (hydroxypropyl silicone oil) under a stirring state, filling nitrogen into the reaction kettle for 10min, then sealing, heating to 50 ℃ under a sealing state, reacting for 4h, taking out the mixture from the reaction kettle, carrying out suction filtration, and drying at 65 ℃ to obtain the shielding temporary plugging agent.
The prepared shielding temporary plugging agent is transferred into 300mL of water and placed in an aging tank, the water is cooled, filtered and dried after being hot rolled for 16h at 150 ℃, the plugging effect of the shielding temporary plugging agent is evaluated according to a method for measuring the sealing filtration loss in the Q/SLCG 0046-2013 drilling fluid plugging agent while drilling general technical requirement, and the result is shown in Table 7.
Wherein, after the shielding temporary plugging agent is modified by the second modifier, the surface contact angle is 75-85 degrees.
TABLE 7 blocking effect of shielding temporary plugging agent of comparative example 2
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The shielding temporary plugging agent comprises the following components or is prepared from the following raw materials: a) a temporary blocking material, b) a first modifier, c) a second modifier, and d) a solvent; wherein the first modifier is selected from one or more of fatty acid, fatty alcohol and fatty acid ester, and the second modifier is selected from one or more of alkane and silicone oil.
2. The shielding temporary plugging agent according to claim 1, wherein the weight parts of each component are as follows: 1-50 parts of temporary plugging material, 0.1-5.0 parts of first modifier, 0.1-5.0 parts of second modifier and 100 parts of solvent.
3. The shielding temporary plugging agent according to claim 1 or 2, wherein the weight ratio of said first modifier to said second modifier is from 0.5 to 3.0, preferably from 0.8 to 2.8.
4. Shielding temporary blocking agent according to claim 1 or 2, wherein said first modifier is selected from one or more of C6-C24 fatty acids, C6-C18 fatty acid esters, C6-C18 alcohols and C12-C18 alcohol esters, preferably one or more of C10-C20 fatty acids, C6-C12 fatty acid esters and C6-C12 alcohols.
5. The shielding temporary blocking agent according to any one of claims 1 to 4, wherein said second modifier is selected from one or more of C10-C20 alkane, liquid paraffin, hydroxy silicone oil, C1-C2 alkyl silicone oil, dimethyl silicone oil, hydroxypropyl silicone oil and benzyl silicone oil, preferably methyl silicone oil and/or C8-C16 alkane.
6. The shielding temporary blocking agent according to any one of claims 1 to 5, wherein said solvent is selected from one or more of C2-C8 alcohol, C3-C6 ketone and C4-C8 alkane; the temporary plugging material is selected from at least one of carbonate rock, limestone, dolomite, dolomitic limestone and dolomitic limestone, and carbonate rock is preferred;
the C2-C8 alcohol is preferably one or more of methanol, ethanol, isopropanol, n-butanol and tert-butanol, the C3-C6 ketone is preferably one or more of acetone, butanone, pentanone and methyl ethyl ketone, the C4-C8 alkane is preferably one or more of pentane, hexane, heptane and octane, and more preferably petroleum ether.
7. A method of preparing the shielding temporary plugging agent of any one of claims 1 to 6, comprising the steps of:
1) mixing and heat treating the temporary plugging material, the first modifier, the second modifier and the solvent,
2) subjecting the mixture after the heat treatment of step 1) to solid-liquid separation, and drying the solid thus obtained.
8. The method of claim 7, wherein the heat treatment conditions include: the temperature is 40-60 ℃, and the time is 2-6 h; the drying conditions include: the temperature is 50-80 ℃, and the time is 2-8 h.
9. The preparation method according to claim 7 or 8, characterized by comprising the following specific steps:
firstly, adding 100 parts by weight of solvent into a reaction kettle, then adding 2-30 parts by weight of temporary plugging material, sequentially adding a first modifier and a second modifier under a stirring state, filling nitrogen into the reaction kettle for 10-20 min, sealing, heating to 40-60 ℃ under a sealing state, reacting for 2-6 h, taking out a reactant from the reaction kettle, performing suction filtration, and drying at 50-80 ℃ for 2-8 h to obtain the shielding temporary plugging agent.
10. Use of the shielding temporary plugging agent according to any one of claims 1 to 6 or prepared by the preparation method according to any one of claims 7 to 9 in an oilfield drilling fluid, preferably the shielding temporary plugging agent has a contact angle of 40 to 80 °.
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| CN202010011469.0A CN113072919A (en) | 2020-01-06 | 2020-01-06 | Shielding temporary plugging agent and preparation method and application thereof |
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| CN114686185A (en) * | 2022-03-30 | 2022-07-01 | 中国海洋石油集团有限公司 | Reservoir protection agent capable of being applied to acid-sensitive stratum in suspension mode |
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| CN103834369A (en) * | 2014-02-24 | 2014-06-04 | 中国海洋石油总公司 | Self-plugging removal carbonate reservoir drill-in fluid |
| CN105462258A (en) * | 2015-11-25 | 2016-04-06 | 宜昌兴之新塑胶电子科技有限公司 | Silicone rubber compound dedicated modified nano calcium carbonate and preparation method thereof |
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