CN115418204B - Oilfield drilling fluid plugging agent and preparation method thereof - Google Patents
Oilfield drilling fluid plugging agent and preparation method thereof Download PDFInfo
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- CN115418204B CN115418204B CN202211156521.7A CN202211156521A CN115418204B CN 115418204 B CN115418204 B CN 115418204B CN 202211156521 A CN202211156521 A CN 202211156521A CN 115418204 B CN115418204 B CN 115418204B
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- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 239000012530 fluid Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 82
- 239000000835 fiber Substances 0.000 claims abstract description 65
- 239000004743 Polypropylene Substances 0.000 claims abstract description 58
- -1 polypropylene Polymers 0.000 claims abstract description 58
- 229920001155 polypropylene Polymers 0.000 claims abstract description 58
- 239000004568 cement Substances 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 22
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 22
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000013067 intermediate product Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000000047 product Substances 0.000 claims abstract description 5
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 10
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 10
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 10
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 10
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000007822 coupling agent Substances 0.000 claims description 5
- 230000001808 coupling effect Effects 0.000 claims description 4
- 125000005442 diisocyanate group Chemical group 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 16
- 239000011148 porous material Substances 0.000 abstract description 13
- 230000004048 modification Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 18
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 14
- 239000003129 oil well Substances 0.000 description 14
- 239000000377 silicon dioxide Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000012153 distilled water Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 239000002981 blocking agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
-
- 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
-
- 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
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
Abstract
The invention relates to the technical field of oilfield drilling plugging, and discloses an oilfield drilling fluid plugging agent and a preparation method thereof, wherein the plugging agent comprises, by weight, 35-50 parts of ultrafine cement, 12-25 parts of organic bentonite, 10-18 parts of hydrophilic modified polypropylene fibers, 3.5-8 parts of bucky pipes and 1.5-5.5 parts of bridging agents; the preparation method of the oilfield drilling fluid plugging agent comprises the following steps: s1, mixing hydrophilic modified polypropylene fibers, a bucky pipe and a bridging agent, homogenizing, adding a solvent, and stirring and dispersing to obtain a crude mixture; s2, mixing the crude mixture with organic bentonite, homogenizing, centrifuging, drying and crushing solid matters to obtain a medium product; s3, the intermediate product is mixed with superfine cement in a hedging way, washed and dried to obtain the plugging agent for the drilling fluid of the oil field. The polypropylene fiber is subjected to hydrophilic modification, so that the plugging agent for the oilfield drilling fluid can adapt to the deformation of the pores and the like under the sufficient plugging and leakage-preventing effects.
Description
Technical Field
The invention relates to the technical field of oilfield drilling plugging, in particular to an oilfield drilling fluid plugging agent and a preparation method thereof.
Background
In the process of petroleum exploitation and the like, holes are drilled by a drilling method, an oil layer casing is generally put into after the oil layer is drilled, and oil well cement is injected into an annular space between the casing and a well wall so as to maintain the well wall and seal oil, gas and water layers. The drilling can cause stratum defect, cracks and underground pore canal, and in order to ensure the stable structure and normal use of an oil well, an oil field drilling fluid plugging agent is required to be used for plugging the stratum well wall.
Common plugging agents include polypropylene fibers, synthetic fibers and the like, but when oil well leakage is serious, the plugging agents cannot achieve a sufficient plugging effect. The research shows that in the polypropylene blocking agent, the fiber dispersing effect is an important factor influencing the leakage-proof effect of the blocking agent, and based on the important factor, silica fiber is also proposed as the blocking agent.
As disclosed in the patent publication No. CN110093146a, a plugging agent and a plugging agent slurry are disclosed, wherein the plugging agent comprises oil well cement, silica fiber, thixotropic agent and fluid loss additive, and the silica fiber is used for replacing polypropylene fiber, so that the silica itself has hydrophilicity and high density and can be uniformly dispersed in the oil well cement, thereby solving the problem of poor plugging effect caused by poor dispersibility of the conventional polypropylene plugging agent.
However, the use of silica fibers as blocking agents has the following problems: the silica fiber material has high hardness and low elastic stress, and when the oil well cracks or pores are serious, the rigid plugging agent such as silica fiber cannot adapt to the deformation of the pores, so that the plugging effect is unstable.
Therefore, we continue to provide a plugging agent for oilfield drilling fluid with good and stable plugging effect.
Disclosure of Invention
The invention aims to solve the technical problems that:
at present, in the existing oilfield drilling fluid plugging agent, the problem of poor leakage prevention effect caused by poor fiber dispersibility exists in the polypropylene fiber plugging agent, while the problem of dispersibility can be solved in the silica fiber plugging agent, but the silica fiber belongs to a rigid material, cannot adapt to deformation of the pore of an oil well during deformation, and the plugging effect is unstable.
The invention adopts the technical scheme that:
the invention provides an oilfield drilling fluid plugging agent which comprises, by weight, 35-50 parts of ultrafine cement, 12-25 parts of organic bentonite, 10-18 parts of hydrophilic modified polypropylene fibers, 3.5-8 parts of bucky pipes and 1.5-5.5 parts of bridging agents.
Preferably, the hydrophilic modified polypropylene fiber contains-COOH, -OH, -CHO or-SO on a branched chain 3 And H, polypropylene fiber with at least one hydrophilic group.
Preferably, the preparation method of the hydrophilic modified polypropylene fiber comprises the following steps:
dispersing polypropylene fiber into organic solvent, adding coupling agent, and introducing hydrophilic group through coupling action to obtain hydrophilic modified polypropylene fiber.
Preferably, the coupling agent is an organic coupling agent containing a carboxyl group.
Preferably, the bridging agent is at least one of divinylbenzene, diisocyanate or N, N-methylenebisacrylamide.
Preferably, the ultra-fine cement has a particle size of less than 8 μm.
The preparation method of the oilfield drilling fluid plugging agent comprises the following steps:
s1, mixing hydrophilic modified polypropylene fibers, a bucky pipe and a bridging agent, homogenizing, adding a solvent, and stirring and dispersing to obtain a crude mixture;
s2, mixing the crude mixture with organic bentonite, homogenizing, centrifuging, drying and crushing solid matters to obtain a medium product;
s3, the intermediate product is mixed with superfine cement in a hedging way, washed and dried to obtain the plugging agent for the drilling fluid of the oil field.
Preferably, in step S1, stirring is performed at a temperature of 80-125 ℃ and ultrasonic dispersion is used.
Preferably, in step S2, the particle size of the finely divided intermediate product is controlled to be 20-55. Mu.m.
Preferably, in step 3, the mixing is performed using an air flow counter-punch.
The beneficial effects of the invention are as follows:
the plugging agent for the oilfield drilling fluid adopts conventional polypropylene fiber as a plugging raw material, and is coupled with-COOH, -OH, -CHO or-SO on a branched chain thereof 3 At least one hydrophilic group in the H ensures that the polypropylene fiber has hydrophilicity, so that the polypropylene fiber can be uniformly distributed in a material when being mixed with superfine cement for plugging, and the stability of a plugging system is improved; the raw material components also comprise organic matters containing-COOH, so that the coupling effect can be realized, the retarding effect can be exerted, and the plugging agent can flow to the pores of the well wall; the unsaturated oxygen-containing groups contained in the plugging agent have thixotropic effect, and can be solidified and plugged in a faster time after being coated on the well wall surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention provides an oilfield drilling fluid plugging agent which comprises, by weight, 35-50 parts of superfine cement with a particle size smaller than 8 mu m, 12-25 parts of organic bentonite, 10-18 parts of hydrophilic modified polypropylene fibers, 3.5-8 parts of bucky pipes and 1.5-5.5 parts of bridging agents, wherein the bridging agents are at least one of divinylbenzene, diisocyanate or N, N-methylene bisacrylamide;
the preparation method of the hydrophilic modified polypropylene fiber comprises the following steps:
dispersing polypropylene fibers into an organic solvent, adding an organic coupling agent containing carboxyl, and introducing hydrophilic groups through coupling action to obtain hydrophilic modified polypropylene fibers; hydrophilic groups selected from-COOH, -OH, -CHO or-SO 3 At least one of H.
The invention also provides a preparation method of the plugging agent for the oilfield drilling fluid, which comprises the following steps:
s1, mixing hydrophilic modified polypropylene fibers, a bucky pipe and a bridging agent, homogenizing, adding a solvent, heating to 80-125 ℃, stirring, and performing ultrasonic dispersion for 25-60min to obtain a crude mixture;
s2, mixing the crude mixture with organic bentonite, homogenizing, centrifuging, and taking solid matters to dry and finely divide until the particle size is 20-55 mu m to obtain a middle product;
s3, carrying out opposite flushing mixing, washing and drying on the intermediate product and the superfine cement through an air flow opposite flushing machine to obtain the oilfield drilling fluid plugging agent.
Example 1
According to the weight portions, 43 portions of superfine cement, 17 portions of organic bentonite, 14.5 portions of hydrophilic modified polypropylene fiber, 5.5 portions of bucky pipe and 2 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is formed by coupling-OH and-SO 3 Modification of HThe polypropylene fiber, the bridging agent is N, N-methylene bisacrylamide.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 102 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with more than 20% of pores, and the plugging effect is not reduced after a period of time.
Example 2
According to the weight portions, 43 portions of superfine cement, 17 portions of organic bentonite, 14.5 portions of hydrophilic modified polypropylene fiber, 5.5 portions of bucky pipe and 2 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is formed by coupling-OH and-SO 3 The modified polypropylene fiber of H is N, N-methylene bisacrylamide as a bridging agent.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 102 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with more than 20% of pores, and the plugging effect is not reduced after a period of time.
Example 3
According to the weight portions, 35 portions of superfine cement, 12 portions of organic bentonite and 18 portions of hydrophilic modified polypropylene fiber are respectively measured8 parts of a bucky pipe and 5.5 parts of a bridging agent, wherein the hydrophilic modified polypropylene fiber is formed by coupling-OH and-SO 3 The modified polypropylene fiber of H is N, N-methylene bisacrylamide as a bridging agent.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 110 ℃, and performing ultrasonic dispersion for 50 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 32 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the energy consumption in the preparation process is slightly high, the prepared plugging agent for the oilfield drilling fluid can effectively plug the well wall of the oil well with the pores exceeding 18%, and the plugging effect is not reduced after a period of time.
Example 4
According to the weight portions, 50 portions of superfine cement, 25 portions of organic bentonite, 10 portions of hydrophilic modified polypropylene fiber, 3.5 portions of bucky pipe and 1.5 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is formed by coupling-OH and-SO 3 The modified polypropylene fiber of H is N, N-methylene bisacrylamide as a bridging agent.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 100 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with more than 20% of pores, and the plugging effect is not obviously reduced after a period of time.
Example 5
According to the weight portions, 43 portions of superfine cement, 17 portions of organic bentonite, 14.5 portions of hydrophilic modified polypropylene fiber, 5.5 portions of bucky pipe and 2 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is modified polypropylene fiber coupled with-COOH, and the bridging agent is N, N-methylene bisacrylamide.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 102 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with more than 20% of pores, and the plugging effect is not reduced after a period of time.
Example 6
According to the weight portions, 43 portions of superfine cement, 17 portions of organic bentonite, 14.5 portions of hydrophilic modified polypropylene fiber, 5.5 portions of bucky pipe and 2 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is modified polypropylene fiber coupled with-CHO, and the bridging agent is N, N-methylene bisacrylamide.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 102 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with more than 20% of pores, and the plugging effect is not reduced after a period of time.
Example 7
According to the weight portions, 43 portions of superfine cement, 17 portions of organic bentonite, 14.5 portions of hydrophilic modified polypropylene fiber, 5.5 portions of Bakelite and 2 portions of bridging agent are respectively measured, wherein the hydrophilic modified polypropylene fiber is coupled with-COOH, -OH, -CHO and-SO 3 The modified polypropylene fiber of H is N, N-methylene bisacrylamide as a bridging agent.
Mixing the hydrophilic modified polypropylene fiber, the Barbary pipe and the bridging agent which are measured according to the amount, adding the mixture into an isopropanol solvent, heating the mixture to about 102 ℃, and performing ultrasonic dispersion for 40 minutes; adding the weighed organic bentonite, mixing at the rotating speed of 4000r/min, centrifuging at the rotating speed of 10000r/min, and finely crushing the solid obtained by separation to about 35 mu m; and then, the air flow is adopted to impact, the finely crushed intermediate product is mixed with superfine cement, distilled water is used for washing for 2 times, and the oil field drilling fluid plugging agent is obtained after drying.
Through experiments, the plugging agent for the oilfield drilling fluid prepared in the embodiment can effectively plug the well wall of the oil well with pores exceeding 15%, and the plugging effect is not obviously reduced after a period of time.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The oilfield drilling fluid plugging agent is characterized by comprising, by weight, 35-50 parts of ultrafine cement, 12-25 parts of organic bentonite, 10-18 parts of hydrophilic modified polypropylene fibers, 3.5-8 parts of bucky pipes and 1.5-5.5 parts of bridging agents, wherein the hydrophilic modified polypropylene fibers comprise-COOH, -OH, -CHO or-SO on branched chains 3 Polypropylene fibers of at least one hydrophilic group of H;
the preparation method of the hydrophilic modified polypropylene fiber comprises the following steps:
dispersing polypropylene fiber into organic solvent, adding organic coupling agent containing carboxyl, and introducing hydrophilic group through coupling action to obtain hydrophilic modified polypropylene fiber.
2. The oilfield drilling fluid plugging agent of claim 1, wherein the bridging agent is at least one of divinylbenzene, diisocyanate, or N, N-methylenebisacrylamide.
3. The oilfield drilling fluid plugging agent of claim 1, wherein the ultra-fine cement has a particle size of less than 8 μm.
4. A method of preparing an oilfield drilling fluid plugging agent according to any one of claims 1 to 3, comprising the steps of:
s1, mixing hydrophilic modified polypropylene fibers, a bucky pipe and a bridging agent, homogenizing, adding a solvent, and stirring and dispersing to obtain a crude mixture;
s2, mixing the crude mixture with organic bentonite, homogenizing, centrifuging, drying and crushing solid matters to obtain a medium product;
s3, the intermediate product is mixed with superfine cement in a hedging way, washed and dried to obtain the plugging agent for the drilling fluid of the oil field.
5. The method for preparing a plugging agent for oilfield drilling fluid according to claim 4, wherein in the step S1, stirring is performed at a temperature of 80-125 ℃ and ultrasonic dispersion is adopted.
6. The method for preparing plugging agent for oilfield drilling fluid according to claim 4, wherein in the step S2, the particle size of the finely divided intermediate product is controlled to be 20-55 μm.
7. The method for preparing an oilfield drilling fluid plugging agent according to claim 4, wherein in the step 3, the air current counter-flushing machine is adopted for mixing.
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| US10017679B1 (en) * | 2017-11-07 | 2018-07-10 | Southwest Petroleum University | Plugging agent for improving formation bearing capacity and preparation method thereof |
| CN110820066A (en) * | 2018-08-08 | 2020-02-21 | 中国石油大学(华东) | Modified polypropylene fiber and preparation method thereof, fiber-reinforced plugging material for drilling fluid, drilling fluid and application |
| CN111363527A (en) * | 2020-03-24 | 2020-07-03 | 嘉华特种水泥股份有限公司 | Low-temperature high-strength plugging agent for oil and gas well |
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2022
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| CA2420170A1 (en) * | 2002-03-05 | 2003-09-05 | Alpine Mud Products Corporation | Water-based drilling fluid additive containing talc and carrier |
| CN103265936A (en) * | 2013-04-18 | 2013-08-28 | 张家港市一达水泥混凝土外加剂有限公司 | Rapid plugging agent |
| CN104152125A (en) * | 2014-08-16 | 2014-11-19 | 成都汉元君业油田技术有限公司 | High dehydration solidification pressuring bearing plugging agent |
| US10017679B1 (en) * | 2017-11-07 | 2018-07-10 | Southwest Petroleum University | Plugging agent for improving formation bearing capacity and preparation method thereof |
| CN110820066A (en) * | 2018-08-08 | 2020-02-21 | 中国石油大学(华东) | Modified polypropylene fiber and preparation method thereof, fiber-reinforced plugging material for drilling fluid, drilling fluid and application |
| CN111363527A (en) * | 2020-03-24 | 2020-07-03 | 嘉华特种水泥股份有限公司 | Low-temperature high-strength plugging agent for oil and gas well |
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