CN116285920A - Degradable fiber temporary plugging agent and application thereof as fracturing fluid - Google Patents
Degradable fiber temporary plugging agent and application thereof as fracturing fluid Download PDFInfo
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- CN116285920A CN116285920A CN202211652361.5A CN202211652361A CN116285920A CN 116285920 A CN116285920 A CN 116285920A CN 202211652361 A CN202211652361 A CN 202211652361A CN 116285920 A CN116285920 A CN 116285920A
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- temporary plugging
- degradable
- degradable fiber
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- 239000000835 fiber Substances 0.000 title claims abstract description 101
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 89
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000002562 thickening agent Substances 0.000 claims abstract description 33
- 239000012670 alkaline solution Substances 0.000 claims abstract description 28
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 28
- 239000004626 polylactic acid Substances 0.000 claims abstract description 28
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 27
- 235000011187 glycerol Nutrition 0.000 claims abstract description 25
- 239000004632 polycaprolactone Substances 0.000 claims abstract description 24
- 229920001610 polycaprolactone Polymers 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000015556 catabolic process Effects 0.000 claims abstract description 20
- 238000006731 degradation reaction Methods 0.000 claims abstract description 20
- 238000006065 biodegradation reaction Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 28
- 238000001879 gelation Methods 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 24
- 239000011259 mixed solution Substances 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 235000010469 Glycine max Nutrition 0.000 claims description 9
- 240000008042 Zea mays Species 0.000 claims description 9
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 9
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 9
- 235000005822 corn Nutrition 0.000 claims description 9
- 244000068988 Glycine max Species 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- -1 polybutylene terephthalate-adipate Polymers 0.000 claims description 4
- 208000003643 Callosities Diseases 0.000 claims description 3
- 206010020649 Hyperkeratosis Diseases 0.000 claims description 3
- ATZQZZAXOPPAAQ-UHFFFAOYSA-M caesium formate Chemical compound [Cs+].[O-]C=O ATZQZZAXOPPAAQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 8
- 239000002981 blocking agent Substances 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- 125000004386 diacrylate group Chemical group 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Abstract
The invention provides a degradable fiber temporary plugging agent and application thereof as fracturing fluid, and belongs to the technical field of drilling engineering. The invention provides a degradable fiber temporary plugging agent which is prepared from the following components in parts by weight: 3 to 10 parts of degradable fiber, 35 to 55 parts of polylactic acid, 15 to 55 parts of biological degradation agent, 1 to 8 parts of glycerin, 2 to 8 parts of polycaprolactone, 3 to 8 parts of thickening agent, 1 to 3 parts of alkaline solution, 0.1 to 0.5 part of cross-linking agent and 30 to 60 parts of water. The material provided by the invention can be gelled under the heating condition, so that the blocking strength of the temporary blocking agent is improved; the degradation capacity of the temporary plugging agent can be improved by adding a biodegradation agent into the raw materials; by adding the degradable fiber, a three-dimensional network structure can be formed in the formed gel substance, and the blocking strength of the temporary blocking agent is further improved.
Description
Technical Field
The invention relates to the technical field of drilling engineering, in particular to a degradable fiber temporary plugging agent and application thereof as fracturing fluid.
Background
The temporary plugging agent is a substance for temporarily reducing the permeability of a stratum or temporarily plugging a high-permeability oil layer, and can be used for deviating and turning the azimuth of a crack in the fracturing process of an oil and gas well to form a new artificial crack, and a new oil and gas seepage channel is opened, so that the degree of trench communication is low to a greater extent, and even a non-used reservoir is used for achieving the purpose of increasing the yield.
However, in order to improve the plugging effect, the plugging agent is usually stored by adding inorganic filler into the formula, but the problem of poor plugging effect exists, and the degradation performance of the original material is reduced. Therefore, there is a need to provide a temporary plugging agent which has a good plugging effect and excellent degradation performance.
Disclosure of Invention
In view of the above, the invention aims to provide a degradable fiber temporary plugging agent and application thereof as a fracturing fluid. The degradable fiber temporary plugging agent provided by the invention has the advantages of good plugging effect and excellent degradation performance.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a degradable fiber temporary plugging agent which is prepared from the following components in parts by weight:
3 to 10 parts of degradable fiber, 35 to 55 parts of polylactic acid, 15 to 55 parts of biological degradation agent, 1 to 8 parts of glycerin, 2 to 8 parts of polycaprolactone, 3 to 8 parts of thickening agent, 1 to 3 parts of alkaline solution, 0.1 to 0.5 part of cross-linking agent and 30 to 60 parts of water.
Preferably, the degradable fibers include at least one of polylactic acid fibers, polyvinyl alcohol fibers, and polybutylene terephthalate-adipate fibers.
Preferably, the degradable fiber has a diameter of 12-20 μm and a length of 2-6 mm
Preferably, the biodegradable agent comprises soy and/or corn.
Preferably, the particle size of the soybeans and the corns is independently 0.3-0.8 mm.
Preferably, the thickener includes at least one of sodium bromide, sodium chloride, potassium chloride and cesium formate.
The invention also provides a preparation method of the degradable fiber temporary plugging agent, which comprises the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
Preferably, the gelatinization temperature in the step (1) is 70-85 ℃, and the gelatinization time is 0.5-2 h.
Preferably, the temperature of the gelation treatment in the step (2) is 70-90 ℃; the gelation treatment time is 3-8 hours.
The invention provides a degradable fiber temporary plugging agent which is prepared from the following components in parts by weight: 3 to 10 parts of degradable fiber, 35 to 55 parts of polylactic acid, 15 to 55 parts of biological degradation agent, 1 to 8 parts of glycerin, 2 to 8 parts of polycaprolactone, 3 to 8 parts of thickening agent, 1 to 3 parts of alkaline solution, 0.1 to 0.5 part of cross-linking agent and 30 to 60 parts of water. The material provided by the invention can be gelled under the heating condition, so that the blocking strength of the temporary blocking agent is improved; the degradation capacity of the temporary plugging agent can be improved by adding a biodegradation agent into the raw materials; by adding the degradable fiber, a three-dimensional network structure can be formed in the formed gel substance, the blocking strength of the temporary plugging agent is further improved, and meanwhile, the degradation capability of the temporary plugging agent caused by the inorganic filler can be prevented from being reduced due to the good degradation performance of the degradable fiber. The results of the examples show that the degradable fiber temporary plugging agent provided by the invention has excellent degradation performance and also has good plugging effect when used as fracturing fluid.
Detailed Description
The invention provides a degradable fiber temporary plugging agent which is prepared from the following components in parts by weight:
3 to 10 parts of degradable fiber, 35 to 55 parts of polylactic acid, 15 to 55 parts of biological degradation agent, 1 to 8 parts of glycerin, 2 to 8 parts of polycaprolactone, 3 to 8 parts of thickening agent, 1 to 3 parts of alkaline solution, 0.1 to 0.5 part of cross-linking agent and 30 to 60 parts of water.
The raw materials selected in the invention are conventional commercial products unless specified.
The components for preparing the degradable fiber temporary plugging agent comprise 3-10 parts of degradable fiber, preferably 4-8 parts of degradable fiber, and more preferably 5-7 parts of degradable fiber.
In the present invention, the degradable fiber preferably includes at least one of polylactic acid fiber, polyvinyl alcohol fiber and polybutylene terephthalate-adipate fiber, more preferably polyvinyl alcohol fiber. In the present invention, the diameter of the degradable fiber is preferably 12 to 20. Mu.m, more preferably 13 to 18. Mu.m. In the present invention, the length of the degradable fiber is preferably 2 to 6mm, more preferably 3 to 5mm. The degradable fiber is selected and the specification of the degradable fiber is limited in the range as the raw material of the temporary plugging agent, so that the degradable fiber can be filled in the gaps of the degradable particles to form a three-dimensional network structure, and the plugging strength of the temporary plugging agent is further improved.
The components for preparing the temporary plugging agent for the degradable fiber comprise 35-55 parts of polylactic acid, preferably 38-52 parts of polylactic acid, and more preferably 40-50 parts of polylactic acid, calculated by 3-10 parts of degradable fiber by weight. In the invention, the polylactic acid has good biodegradability and can be completely degraded by microorganisms in nature after being used.
The components for preparing the temporary plugging agent for the degradable fiber comprise 15-55 parts of a biodegradable agent, preferably 18-53 parts of the biodegradable agent, and more preferably 20-50 parts of the biodegradable agent, calculated by 3-10 parts of the degradable fiber. In the present invention, the biodegradable agent preferably comprises soybean and/or corn. In the present invention, the particle size of the soybeans and the corns is independently preferably 0.3 to 0.8mm, more preferably 0.4 to 0.7mm. The invention is beneficial to improving the degradability of the temporary plugging agent by adding the biodegradation agent into the formula.
The components for preparing the temporary plugging agent for the degradable fiber comprise 1 to 8 parts of glycerin, preferably 2 to 7 parts of glycerin, and more preferably 3 to 6 parts of glycerin, calculated by 3 to 10 parts of degradable fiber by weight. According to the invention, the glycerol is added into the raw materials to promote the gelation process and improve the plugging effect.
The components for preparing the temporary plugging agent for the degradable fiber comprise 2-8 parts of polycaprolactone, preferably 3-7 parts of polycaprolactone, and more preferably 3-6 parts of the degradable fiber by weight percent. In the invention, the polycaprolactone can be gelled in a reverse way, so that the plugging effect of the plugging agent is improved.
The components for preparing the temporary plugging agent for the degradable fiber comprise 3-8 parts of thickening agent, preferably 4-7 parts of thickening agent, and more preferably 5-6 parts of thickening agent, calculated by 3-10 parts of degradable fiber by weight. In the present invention, the thickener is preferably at least one of sodium bromide, sodium chloride, potassium chloride and cesium formate. The invention can increase the viscosity of the system by selecting the substances as the thickening agent.
The components for preparing the degradable fiber temporary plugging agent comprise 1-3 parts of alkaline solution, preferably 2 parts, by weight of 3-10 parts of degradable fiber. In the present invention, the alkaline solution is preferably a sodium carbonate solution and/or a sodium hydroxide solution. In the present invention, the mass concentration of the alkaline solution is preferably 10% to 20%, more preferably 12% to 18%. The invention promotes the gelation process by adding alkaline solution into the raw materials to adjust the acid-base property of the reaction.
The components for preparing the temporary plugging agent for the degradable fiber comprise 0.1 to 0.5 part, preferably 0.2 to 0.4 part and more preferably 0.3 part of cross-linking agent based on 3 to 10 parts by weight of the degradable fiber. In the present invention, the crosslinking agent is preferably at least one of ethylene glycol diacrylate, methylene bisacrylamide, sodium potassium dichromate borate, and polyethylene glycol diacrylate, more preferably polyethylene glycol diacrylate. The invention has better gelation effect by selecting the substances as the cross-linking agent.
The components for preparing the temporary plugging agent for the degradable fiber comprise 30-60 parts of water, preferably 32-58 parts of water, and more preferably 35-55 parts of water, calculated by 3-10 parts of degradable fiber by weight. In the present invention, the water is present as a solvent.
According to the invention, the degradable fiber is added into the common raw materials for generating the polymer, and the fiber can be dispersed in the raw materials to form a three-dimensional network structure, so that the blocking strength of the temporary blocking agent is further improved, and meanwhile, the degradation capability reduction problem caused by the inorganic filler can be avoided due to the good degradation performance of the degradable fiber.
The invention also provides a preparation method of the degradable fiber temporary plugging agent, which comprises the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
The invention mixes and gelatinizes the biological degradation agent and water to obtain gelatinized solution.
In the present invention, the temperature of the gelatinization is preferably 70 to 85 ℃, more preferably 75 to 83 ℃. In the present invention, the time for the gelatinization is preferably 0.5 to 2 hours, more preferably 1 to 1.5 hours. The present invention limits the temperature and implementation of the gelatinization to the above ranges to facilitate a uniform gelatinization system.
The mode of mixing is not particularly limited in the present invention, and conventional mixing may be performed according to a mixing mode well known to those skilled in the art.
After the gelatinized solution is obtained, the gelatinized solution, the degradable fiber, the polylactic acid, the glycerol, the polycaprolactone, the thickener, the cross-linking agent and the alkaline solution are mixed to obtain a mixed solution.
In the present invention, the order of mixing is preferably to mix the pasting solution with the degradable fiber, the polylactic acid, the glycerin, the polycaprolactone, the thickener, the crosslinking agent, and the alkaline solution in this order.
In the present invention, the pasting solution is preferably cooled before use. In the present invention, the cooling means is preferably room temperature cooling. In the present invention, the temperature of the cooling is preferably room temperature. The invention cools the pasting solution to room temperature, which is beneficial to the operation safety during the subsequent material feeding.
In the present invention, the alkaline solution is preferably mixed by dropping. The dropping rate is not particularly limited in the present invention, and the dropping may be performed at a dropping rate well known to those skilled in the art. The alkaline solution is added in a dropwise manner, so that the influence on the gelation effect caused by too large local pH value of the reaction system is avoided. The mixing mode of the polylactic acid, the glycerol, the polycaprolactone, the thickening agent and the cross-linking agent is not particularly limited, and the polylactic acid, the glycerol, the polycaprolactone, the thickening agent and the cross-linking agent are mixed conventionally by adopting a material mixing mode well known to a person skilled in the art.
After the mixed solution is obtained, the mixed solution is heated for gelation treatment to obtain a gel product.
In the present invention, the temperature of the gelation treatment is preferably 70 to 90 ℃, more preferably 75 to 85 ℃. In the present invention, the time for the gelation treatment is preferably 3 to 8 hours, more preferably 4 to 6 hours. The invention limits the temperature and time of the gelation treatment to the above range, which is beneficial to the smooth proceeding of the gelation process.
After the gel product is obtained, the invention granulates the gel product to obtain the degradable fiber temporary plugging agent.
The operation of the granulation is not particularly limited in the present invention, and granulation may be performed in a manner known to those skilled in the art as granulation of gel products.
The invention provides application of the degradable fiber temporary plugging agent in the technical scheme as an oil-gas well fracturing fluid.
The application mode of the invention is not particularly limited, and the invention can be applied according to the application mode of temporary plugging agents which are well known to the person skilled in the art and are used as fracturing fluids of oil and gas wells.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. The described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The degradable fiber temporary plugging agent is prepared from the following components in parts by weight:
3 parts of degradable fiber, 40 parts of polylactic acid, 20 parts of a biodegradation agent, 3 parts of glycerin, 3 parts of polycaprolactone, 4 parts of a thickening agent, 2 parts of an alkaline solution, 0.35 part of a crosslinking agent and 50 parts of water;
wherein the degradable fiber is polyvinyl alcohol fiber with the diameter of 13-18 mu m and the length of 2-6 mm; the biodegradation agent is a mixture of soybean and corn with the particle size of 0.4-0.7 mm (weight ratio of 2:1), the thickener is sodium chloride, the alkaline solution is sodium carbonate solution with the mass concentration of 15%, and the crosslinking agent is polyethylene glycol diacrylate;
the preparation method of the degradable fiber temporary plugging agent comprises the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
wherein the gelatinization temperature is 80 ℃ and the gelatinization time is 1.5h;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
wherein, the mixing mode is as follows: firstly, mixing a pasting solution, polylactic acid, glycerin, polycaprolactone, a thickening agent and a cross-linking agent, and then dropwise adding an alkaline solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
the temperature of the gelation treatment is 80 ℃, and the gelation treatment time is 5 hours;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
Example 2
The degradable fiber temporary plugging agent is prepared from the following components in parts by weight:
4 parts of degradable fiber, 40 parts of polylactic acid, 20 parts of a biodegradation agent, 3 parts of glycerin, 3 parts of polycaprolactone, 4 parts of a thickening agent, 2 parts of an alkaline solution, 0.35 part of a crosslinking agent and 50 parts of water;
wherein the degradable fiber is polyvinyl alcohol fiber with the diameter of 13-18 mu m and the length of 2-6 mm; the biodegradation agent is a mixture of soybean and corn with the particle size of 0.4-0.7 mm (weight ratio of 2:1), the thickener is sodium chloride, the alkaline solution is sodium carbonate solution with the mass concentration of 15%, and the crosslinking agent is polyethylene glycol diacrylate;
the preparation method of the degradable fiber temporary plugging agent comprises the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
wherein the gelatinization temperature is 80 ℃ and the gelatinization time is 1.5h;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
wherein, the mixing mode is as follows: firstly, mixing a pasting solution, polylactic acid, glycerin, polycaprolactone, a thickening agent and a cross-linking agent, and then dropwise adding an alkaline solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
the temperature of the gelation treatment is 80 ℃, and the gelation treatment time is 5 hours;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
Example 3
The degradable fiber temporary plugging agent is prepared from the following components in parts by weight:
5 parts of degradable fiber, 40 parts of polylactic acid, 20 parts of a biodegradation agent, 3 parts of glycerin, 3 parts of polycaprolactone, 4 parts of a thickening agent, 2 parts of an alkaline solution, 0.35 part of a crosslinking agent and 50 parts of water;
wherein the degradable fiber is polyvinyl alcohol fiber with the diameter of 13-18 mu m and the length of 2-6 mm; the biodegradation agent is a mixture of soybean and corn with the particle size of 0.4-0.7 mm (weight ratio of 2:1), the thickener is sodium chloride, the alkaline solution is sodium carbonate solution with the mass concentration of 15%, and the crosslinking agent is polyethylene glycol diacrylate;
the preparation method of the degradable fiber temporary plugging agent comprises the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
wherein the gelatinization temperature is 80 ℃ and the gelatinization time is 1.5h;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
wherein, the mixing mode is as follows: firstly, mixing a pasting solution, polylactic acid, glycerin, polycaprolactone, a thickening agent and a cross-linking agent, and then dropwise adding an alkaline solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
the temperature of the gelation treatment is 80 ℃, and the gelation treatment time is 5 hours;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
The degradable fiber temporary plugging agents prepared in examples 1 to 3 are used as fracturing fluid
The specific operation is that the degradable fiber temporary plugging agents prepared in the examples 1-3, a thickening agent and water are respectively mixed to obtain the fracturing fluid, wherein the thickening agent is sodium carboxymethyl cellulose, and the viscosity of the mixed fluid is 100 mPa.s.
The plugging and unplugging effects of the fracturing fluids obtained in examples 1 to 3 were tested, wherein the plugging effect was the pressure at normal temperature and 80 ℃ respectively, and the unplugging effect was the viscosity at 80 ℃ after adding 0.1wt.% breaker ammonium persulfate to the fracturing fluid. The results are shown in Table 1,
table 1 plugging and unplugging effects of fracturing fluids obtained in examples 1-3
The degradable fiber temporary plugging agents prepared in examples 1 to 3 are mixed with water, the mixture is placed in a constant temperature water bath kettle at 90 ℃ to observe whether the degradable fiber temporary plugging agents are completely dissolved or not, the complete degradation time is recorded, and the test results are shown in Table 2.
TABLE 2 degradability of the degradable fibrous temporary blocking agents prepared in examples 1 to 3
| Degradation time (h) | Degradation rate | |
| Example 1 | 15 | 100％ |
| Example 2 | 12 | 100％ |
| Example 3 | 10 | 100％ |
As can be seen from Table 2, the degradable fiber temporary plugging agent provided by the invention has good degradation performance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The degradable fiber temporary plugging agent is prepared from the following components in parts by weight:
3 to 10 parts of degradable fiber, 35 to 55 parts of polylactic acid, 15 to 55 parts of biological degradation agent, 1 to 8 parts of glycerin, 2 to 8 parts of polycaprolactone, 3 to 8 parts of thickening agent, 1 to 3 parts of alkaline solution, 0.1 to 0.5 part of cross-linking agent and 30 to 60 parts of water.
2. The degradable fibrous temporary plugging agent according to claim 1, wherein the degradable fibers comprise at least one of polylactic acid fibers, polyvinyl alcohol fibers, and polybutylene terephthalate-adipate fibers.
3. The degradable fibrous temporary plugging agent according to claim 1 or 2, wherein the degradable fibers have a diameter of 12-20 μm and a length of 2-6 mm.
4. The degradable fibrous temporary plugging agent according to claim 1, characterized in that the biodegradable agent comprises soybean and/or corn.
5. The degradable fibrous temporary plugging agent according to claim 4, wherein the particle size of the soybeans and the corns is independently 0.3-0.8 mm.
6. The degradable fibrous temporary plugging agent according to claim 1, wherein the thickener comprises at least one of sodium bromide, sodium chloride, potassium chloride and cesium formate.
7. The method for preparing the degradable fibrous temporary plugging agent according to any one of claims 1 to 6, comprising the following steps:
(1) Mixing and gelatinizing a biodegradation agent and water to obtain a gelatinized solution;
(2) Mixing the gelatinized solution obtained in the step (1), degradable fiber, polylactic acid, glycerol, polycaprolactone, a thickening agent, a crosslinking agent and an alkaline solution to obtain a mixed solution;
(3) Heating the mixed solution obtained in the step (2) to carry out gelation treatment to obtain a gel product;
(4) Granulating the gel product obtained in the step (3) to obtain the degradable fiber temporary plugging agent.
8. The method according to claim 7, wherein the gelatinization temperature in the step (1) is 70 to 85℃and the gelatinization time is 0.5 to 2 hours.
9. The method according to claim 7, wherein the temperature of the gelation treatment in the step (2) is 70 to 90 ℃; the gelation treatment time is 3-8 hours.
10. Use of a degradable fibrous temporary plugging agent according to any one of claims 1 to 6 or a degradable fibrous temporary plugging agent prepared by a preparation method according to any one of claims 7 to 9 as an oil and gas well fracturing fluid.
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| CN202211652361.5A CN116285920A (en) | 2022-12-22 | 2022-12-22 | Degradable fiber temporary plugging agent and application thereof as fracturing fluid |
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| CN202211652361.5A CN116285920A (en) | 2022-12-22 | 2022-12-22 | Degradable fiber temporary plugging agent and application thereof as fracturing fluid |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107090282A (en) * | 2017-05-18 | 2017-08-25 | 北京世纪中星能源技术有限公司 | A kind of mixed type diverting agent and its diverting agent mixture, temporary blocking method and application |
| CN108531152A (en) * | 2017-03-01 | 2018-09-14 | 中国石油天然气股份有限公司 | A kind of low-density, high-strength degradable diverting agent and preparation method thereof |
| CN110669484A (en) * | 2019-09-17 | 2020-01-10 | 大港油田集团有限责任公司 | Degradable temporary plugging agent for well repair and preparation method thereof |
| CN112552889A (en) * | 2020-11-16 | 2021-03-26 | 西安石油大油气科技有限公司 | Self-cleaning or self-degrading temporary plugging agent and preparation method thereof |
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2022
- 2022-12-22 CN CN202211652361.5A patent/CN116285920A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531152A (en) * | 2017-03-01 | 2018-09-14 | 中国石油天然气股份有限公司 | A kind of low-density, high-strength degradable diverting agent and preparation method thereof |
| CN107090282A (en) * | 2017-05-18 | 2017-08-25 | 北京世纪中星能源技术有限公司 | A kind of mixed type diverting agent and its diverting agent mixture, temporary blocking method and application |
| CN110669484A (en) * | 2019-09-17 | 2020-01-10 | 大港油田集团有限责任公司 | Degradable temporary plugging agent for well repair and preparation method thereof |
| CN112552889A (en) * | 2020-11-16 | 2021-03-26 | 西安石油大油气科技有限公司 | Self-cleaning or self-degrading temporary plugging agent and preparation method thereof |
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