CN110820066B - Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application - Google Patents
Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application Download PDFInfo
- Publication number
- CN110820066B CN110820066B CN201810897394.3A CN201810897394A CN110820066B CN 110820066 B CN110820066 B CN 110820066B CN 201810897394 A CN201810897394 A CN 201810897394A CN 110820066 B CN110820066 B CN 110820066B
- Authority
- CN
- China
- Prior art keywords
- fiber
- calcium carbonate
- drilling fluid
- polypropylene fiber
- plugging material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
-
- 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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- 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
- D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
- D06M13/503—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms without bond between a carbon atom and a metal or a boron, silicon, selenium or tellurium atom
- D06M13/507—Organic silicon compounds without carbon-silicon bond
-
- 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
- D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
- D06M13/51—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
- D06M13/513—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Abstract
The application relates to the field of plugging materials for drilling fluids, in particular to a modified polypropylene fiber and a preparation method thereof, a fiber reinforced plugging material for drilling fluids, the drilling fluids and application thereof. The fiber reinforced plugging material for the drilling fluid comprises the following components in percentage by weight: 10-30% of modified polypropylene fiber, 10-20% of plant plugging agent, 30-40% of fine calcium carbonate, 10-20% of asphalt and 10-20% of rubber. The fiber reinforced plugging material for the drilling fluid has the characteristics of compact plugging layer, good shearing strength, strong bearing capacity, capability of being matched with different base slurries and wide applicability.
Description
Technical Field
The application relates to the field of plugging materials for drilling fluids, in particular to a modified polypropylene fiber and a preparation method thereof, a fiber reinforced plugging material for drilling fluids, the drilling fluids and application thereof.
Background
Drilling is usually carried out by matching drilling fluid to balance formation pressure, clean the bottom of the well and carry rock debris. Conventionally used drilling fluids include clear water, slurry, emulsion and the like, and are used for loose and easily collapsed rock formations with unstable hole wall.
If the stratum itself has pores, cracks and the like, the drilling fluid can not meet the requirements, and when in downhole operations such as drilling, well cementation, testing and the like, wellbore working fluid (including drilling fluid, cement slurry, completion fluid and the like) is easy to leak into the stratum under the action of pressure difference to form lost circulation. The incidence rate of lost circulation in the national petroleum industry is about 20% -25% of the total well count, and the occurrence rate of fractured lost circulation is more than 80% of the total lost circulation. The difficulty of the fracture leakage blocking is high, and the leakage amount of drilling fluid is high.
At present, the most effective method for treating the fractured leakage is bridge plug plugging, and plugging materials are mixed in drilling fluid and carried into the fracture by the drilling fluid to form a plugging layer. The traditional fibrous plugging materials mostly select plant fibers, animal fibers or mineral fibers, such as sawdust, peanut shells, flax fibers, corncobs, paper fibers, bagasse, cotton seed hulls, tree powders, animal hair, asbestos powder and the like. However, the traditional fiber has poor high temperature resistance and acid and alkali resistance, is easy to coke during high temperature stratum plugging, and reduces plugging capacity; the traditional fiber is easy to soften after absorbing water, the strength is reduced, the mechanical property is poor, the tensile strength is small, and the formed plugging layer is not compact enough.
The synthetic fiber has better temperature resistance and acid and alkali resistance, but the surface of the synthetic fiber is hydrophobic, the dispersion performance in drilling fluid is poor, the physical and chemical bonding capability with plugging materials is poor, and the compact pressure bearing capability of the plugging layer is affected; the synthetic fiber has lower elastic modulus and mechanical strength, and the formed plugging layer has poorer shearing strength and bearing capacity.
Disclosure of Invention
The application aims to solve the problems of poor shearing strength and poor bearing capacity of a plugging layer formed by plugging agents in the prior art, and provides a modified polypropylene fiber, a preparation method thereof, a fiber reinforced plugging material for drilling fluid, the drilling fluid and application.
In order to achieve the above object, a first aspect of the present application provides a method for preparing a modified polypropylene fiber, comprising (1) preparing a filled polypropylene fiber by melt spinning a superfine calcium carbonate and a polypropylene resin together; (2) The filled polypropylene fiber is subjected to surface modification by a silane coupling agent to obtain the modified polypropylene fiber.
The second aspect of the application provides a modified polypropylene fiber, which is prepared by the preparation method, has the breaking strength of more than or equal to 480MPa, the diameter of 20-40 mu m, the length of 3-12mm and the density of 1-1.1g/cm 3 。
The third aspect of the present application provides a fiber-reinforced plugging material for a drilling fluid, comprising, based on the total amount of the fiber-reinforced plugging material for a drilling fluid: 10-30 wt% of modified polypropylene fiber, 10-20 wt% of plant plugging agent, 30-40 wt% of calcium carbonate filler, 10-20 wt% of asphalt and 10-20 wt% of rubber filler, wherein the modified polypropylene fiber is the modified polypropylene fiber.
The fourth aspect of the application provides a drilling fluid, which comprises base slurry and the fiber-reinforced plugging material for the drilling fluid, wherein the addition amount of the fiber-reinforced plugging material for the drilling fluid is 1-4% by weight based on the weight of the base slurry.
In a fifth aspect, the present application provides a drilling fluid as defined above for use in drilling a well.
The modified polypropylene fiber prepared by the application has better dispersibility in water, high elastic modulus, high tensile strength, acid-base resistance and high temperature resistance, and can be uniformly mixed with other raw material components.
The fiber reinforced plugging material prepared by the application takes the modified polypropylene fiber as a main body, has better physical and mechanical properties, elastic modulus, tensile strength and corrosion resistance, has better mixing compatibility with plant plugging agents, calcium carbonate filler, asphalt and rubber filler, has better shearing strength and bearing capacity, and reduces the permeability and leakage of a plugging layer.
The modified polypropylene fiber is uniformly dispersed in the drilling fluid, can contain more plant plugging agents, calcium carbonate filler, asphalt and rubber filler, improves the plugging capacity of a plugging layer, can increase the flow resistance of the drilling fluid, and is beneficial to forming the plugging layer in a near-wellbore zone of a stratum. The formed plugging layer has better compactness, better toughness and strength, better shearing strength and better overall stability.
The calcium carbonate filler and the rubber filler in the fiber reinforced plugging material are respectively mixed in a grading way, so that the compactness of the plugging layer can be further improved, and the permeability and the leakage of the plugging layer are reduced. The modified polypropylene fiber and the fine granular reinforced plugging materials of different types cooperate with other granular and flaky plugging materials to improve the plugging capacity and the bearing capacity of the fractured stratum and meet the technical requirements of dense bearing plugging of the fractured leakage of different opening degrees.
The fiber reinforced plugging material for drilling fluid has the advantages of low cost of raw materials, simple preparation method and simple field application process. The method has wide applicability, can be added into drilling fluid in the drilling process without affecting normal drilling, effectively solves the leakage problem of leaky formations such as pores, microcracks and the like, can also be matched with other granular and sheet plugging materials to perform plugging operation of cracks with different opening degrees, and improves the bearing capacity of the formations.
Drawings
FIG. 1 is an optical photograph of unmodified polypropylene fibers dispersed in water;
fig. 2 is an optical photograph of a dispersion of modified polypropylene fibers in water.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The first aspect of the present application provides a method for preparing a modified polypropylene fiber, comprising (1) preparing a filled polypropylene fiber by blending and melt spinning ultrafine calcium carbonate and a polypropylene resin; (2) The filled polypropylene fiber is subjected to surface modification by a silane coupling agent to obtain the modified polypropylene fiber.
In the application, superfine calcium carbonate and polypropylene resin are blended in advance for melt spinning, so that the heat resistance, mechanical strength and toughness of the polypropylene fiber are improved, and the heat deformation temperature of the polypropylene fiber is reduced. The filling polypropylene fiber is modified by a silane coupling agent, so that the crack defect on the surface of the filling polypropylene fiber can be effectively filled and repaired, the mechanical strength of the modified polypropylene fiber is increased, and the dispersibility is improved.
In the application, in the step (1), superfine calcium carbonate and polypropylene resin are mixed according to the mass ratio of 1:4-5, are melt-blended for 20-40min at 180-250 ℃ for extrusion and granulation, and are dried and melt-spun to obtain the filled polypropylene fiber.
In the present application, the type of the polypropylene resin is not particularly limited, and the density is less than 0.95g/cm 3 The melting point is less than 170 ℃, and the processing grade is wire drawing grade. The mixing mode of the ultrafine calcium carbonate and the polypropylene resin is not particularly limited, and sufficient and uniform mixing can be achieved. The method for melt spinning the mixture of the superfine calcium carbonate and the polypropylene resin is not limited, the spinning speed is 1800-3200m/min, the number of spinning heads is 8, the superfine calcium carbonate and the polypropylene resin are mixed according to the proportion, and the obtained filled polypropylene fiber has the advantages that the breaking strength is more than or equal to 400MPa, the diameter is less than 50 mu m, and the effect is best.
In the application, in the step (2), the silane coupling agent is prepared into an ethanol solution with the concentration of 0.5-3 wt%, the filled polypropylene fiber is soaked in the ethanol solution of the silane coupling agent (the adding amount of the filled polypropylene fiber is 0.02g/mL based on the volume of the solution), and the modified polypropylene fiber is prepared after being treated for 30-50min at the temperature of 40-60 ℃ and dried.
In the present application, the silane coupling agent is not particularly limited, and may be a vinyl silane coupling agent or a methoxy silane, for example, vinyl triethoxysilane, 3-mercaptopropyl trimethoxysilane, and SCA-1613 or SCA-903 may be selected. The amount of the ethanol solution to be used for filling the polypropylene fiber and the silane coupling agent is not particularly limited as long as the filled polypropylene fiber can be immersed in the ethanol solution of the silane coupling agent. The drying temperature of the filled polypropylene fiber after being modified by the silane coupling agent is not particularly limited as long as the solvent evaporation can be achieved.
According to the application, in the step (1), the superfine calcium carbonate is prepared by heating and mixing 0.1-0.5g/mL of calcium carbonate solution and stearic acid at the temperature of 85-100 ℃ for 15-30min, wherein the mass ratio of the calcium carbonate raw material to the stearic acid in the calcium carbonate solution is 25-50:1. The stearic acid can be SA-1865, industrial grade one.
The superfine calcium carbonate is prepared by modifying calcium carbonate raw materials through stearic acid in advance, so that the mixing uniformity of the superfine calcium carbonate and the polypropylene resin is improved, and the mechanical strength and toughness of the filled polypropylene fiber are improved.
According to the application, the calcium carbonate raw material has a particle size of 1000-1500 mesh, preferably 1200 mesh. When the calcium carbonate raw material with the particle size in the range is adopted to modify the polypropylene fiber, the mechanical strength and toughness of the polypropylene fiber can be effectively improved. If the particle size is too large, the mechanical strength improvement requirement of the polypropylene fiber cannot be met; if the particle size is too small, agglomeration is easy, and the mixing of superfine calcium carbonate and polypropylene resin is not facilitated.
The second aspect of the application provides a modified polypropylene fiber, which is prepared by the preparation method, and has the breaking strength of more than or equal to 480MPa, the diameter of 20-40 mu m, the length of 3-12mm and the density of 1-1.1g/cm 3 。
The third aspect of the present application provides a fiber-reinforced plugging material for a drilling fluid, wherein the fiber-reinforced plugging material for a drilling fluid comprises, based on the total amount of the fiber-reinforced plugging material for a drilling fluid: 10-30 wt% of modified polypropylene fiber, 10-20 wt% of plant plugging agent, 30-40 wt% of calcium carbonate filler, 10-20 wt% of asphalt and 10-20 wt% of rubber filler, wherein the modified polypropylene fiber is prepared by the method.
According to the application, the plant plugging agent is selected from shell powder; preferably the hulls are nut and/or fruit hulls. The nut shell is preferably walnut shell, apricot shell or other hard shell, and the fruit shell is preferably cherry shell, coconut shell, durian shell or other hard shell fruit shell. When in use, the shell is ground to 80-120 mesh, preferably 100 mesh. The shell powder within the particle size range can be uniformly mixed with other components, and the particle size is too large or too small, so that the mixing effect with other raw materials is poor.
According to the application, the calcium carbonate filler is a mixture of particles selected from at least one of the particle sizes in the range of 100-300 mesh, 300-500 mesh, 500-1000 mesh and 1000-2000 mesh. The calcium carbonate particles graded in any small range of the above ranges can be selected to be mixed with other components, for example, the calcium carbonate particles graded in the range of 100-300 meshes are selected to be mixed with other components in the raw materials based on the total amount of the calcium carbonate filler. More preferably, calcium carbonate particles of different sizes are selected for continuous grading, intermittent grading or continuous open grading mixing, and then mixed with the other components. For example, 100-300 mesh graded calcium carbonate particles, 300-500 mesh graded calcium carbonate particles, 500-1000 mesh graded calcium carbonate particles and 1000-2000 mesh graded calcium carbonate particles are respectively selected based on the total amount of calcium carbonate filler, and then mixed with other components. When the calcium carbonate particles with different particle diameters are mixed, the plugging layer is more compact, and the leakage amount can be further reduced.
According to the present application, the asphalt is at least one selected from the group consisting of natural asphalt, coal tar asphalt, sulfonated asphalt, and modified asphalt. The asphalt selected in the present application is not particularly limited as long as the requirement of having a softening point of 80 to 150 ℃ is satisfied. The asphalt is softened asphalt, can achieve the deformation of a softening point under the influence of the stratum temperature, can be filled in gaps among the plugging layers under the action of proper pressure difference, and improves the plugging effect of the plugging layers.
According to the present application, the rubber filler is a mixture of rubber particles selected from at least one of the particle diameters in the range of 100 to 300 mesh, 300 to 500 mesh, 500 to 1000 mesh and 1000 to 2000 mesh. The rubber particles are made of at least one of natural rubber, tire rubber, styrene-butadiene rubber, butadiene rubber and butyl rubber.
The rubber particles of any one of the small ranges can be selected for mixing with other components, for example, 100-300 mesh rubber particles can be selected based on the total amount of rubber filler, and then fully mixed with other components. It is preferable that rubber particles having different particle diameters within the above range are continuously graded, intermittently graded or continuously open graded mixed, and then mixed with other components. For example, 100-300 mesh rubber particles, 300-500 mesh rubber particles, 500-1000 mesh rubber particles and 1000-2000 mesh rubber particles are selected based on the total amount of rubber filler, and mixed with other components. The rubber particles have certain elasticity, and can be self-adaptively filled in gaps in the plugging layer when in use, so that the retention capacity and stability of the plugging layer are improved.
The tire rubber is rubber particles with different particle diameters, which are prepared by granulating waste tires, and can be, for example, SDRUB-1 produced by Dongying stone Innovative technology Co.
The fourth aspect of the application provides a drilling fluid, which comprises base slurry and the fiber-reinforced plugging material for the drilling fluid, wherein the addition amount of the fiber-reinforced plugging material for the drilling fluid is 1-4% by weight based on the weight of the base slurry.
The base slurry is a common material in the prior art, and for example, can be: 4% bentonite slurry +0.2% xanthan gum +0.4% high viscosity sodium carboxymethyl cellulose. The plugging material can be uniformly mixed with a plurality of base slurries, is not limited to being mixed with one type of base slurry, has wide applicability, can be added into drilling fluid in the drilling process, is mixed with the drilling fluid according to the proportion, can perform plugging operation on cracks with different opening degrees, and improves plugging capacity and bearing capacity of fractured formations.
In a fifth aspect, the present application provides a drilling fluid as defined above for use in drilling a well.
The plugging layer formed by the mixture has higher shearing strength, improves the plugging capacity and the bearing capacity of the fractured stratum, and meets the technical requirements of dense bearing plugging of the fractured leakage with different opening degrees.
The present application will be described in detail by examples. The performance test of the samples in the following examples was performed as follows:
(1) Evaluation of the dispersibility of the polypropylene fibers was tested as follows: the polypropylene fiber sample to be measured is cut into short fiber bundles with the length of 12mm, and is placed in water to be stirred for 20min, and the fiber dispersion condition is observed.
(2) The breaking strength of the polypropylene fibers was evaluated as follows: the polypropylene fiber sample to be tested is balanced for 24 hours under the environment that the temperature is 20+/-2 ℃ and the humidity is 65%, then an electronic single fiber strength tester is used for testing the breaking strength of single fibers, the gauge is 20mm, the stretching speed is 20mm/min, and the pre-tension is 0.05cN/dtex. Each sample was tested 50 times and averaged to give a final result with a correction factor of 1.
(3) Evaluation of the chemical stability of the polypropylene fibers was tested as follows: the quality retention rate and the fiber morphology change of the polypropylene fiber sample to be tested before and after corrosion in acid, alkali and salt media. The method comprises the following specific steps: respectively preparing 200mL of 15% hydrochloric acid solution, naOH solution with pH=12 and NaCl solution with mineralization degree of 50 g/L; (II) respectively adding 0.4 weight percent of polypropylene fiber sample to be detected into the solutions, and uniformly stirring; (III) placing the mixture in a water bath kettle at the temperature of 90 ℃ for standing for 4 hours; and (IV) rinsing, drying, weighing and calculating the mass retention rate, and observing the morphology of the polypropylene fibers.
(4) Appearance evaluation of fiber-reinforced plugging material for drilling fluid: 20g of each sample to be measured was taken and placed in 50mL test tubes with plugs, and the color and morphology of the samples were visually examined under a bright light.
(5) Moisture content test of fiber reinforced plugging material for drilling fluid: 5g of a sample to be measured is weighed by a weighing bottle with known constant weight, is placed in a drying oven at 105+/-2 ℃ to be dried for 4 hours, is taken out and placed in a dryer, is weighed after being cooled for 30 minutes, is weighed to 0.01g, and calculates the moisture content of the product according to the following formula. Three replicates were run for each example.
The water content calculation formula is:wherein S represents moisture in percentage; m is m 1 The mass of the sample and the weighing bottle is expressed in grams (g); m is m 2 The unit is gram (g) for the dried sample and the weight of the weighing bottle; m is m 3 The unit is gram (g) for weighing the bottle mass.
(6) And (3) evaluating the shear strength of the fiber reinforced plugging material for the drilling fluid: a four-linkage strain control type direct shear apparatus is adopted, and calcium carbonate (20-40 meshes) and bentonite (meeting GB/T5005-2010 standard) are mixed according to a volume ratio of 80:20, uniformly mixing, taking the total amount of calcium carbonate and bentonite as a reference, adding different amounts of fiber reinforced plugging materials for drilling fluid, uniformly mixing, adding 12.5% of water to prepare a mixed sample, and filling into a plastic bag for sealing and curing for 24 hours; after sample preparation, the sample is placed into a direct shear apparatus, the shear strength of the mixed sample is tested, and the shear strength of the mixed sample is evaluated by using the cohesive force c.
(7) Rheological and fluid loss evaluation of drilling fluid: using GB/T29170-2012: performance test standard of petroleum and natural gas industrial drilling fluid. And testing rheological property and fluid loss property of the sample to be tested by using a six-speed viscometer and a medium-pressure fluid loss meter. And then placing the sample to be tested into a high-temperature aging tank, carrying out heat rolling aging for 16 hours at 120 ℃, and testing the rheological property and the fluid loss property of the sample by using the same method.
(8) Drilling fluid sand bed maximum invasion depth and leakage evaluation:
the testing method comprises the following steps: using GB-T29170-2012: testing the drilling fluid in the petroleum and natural gas industry.
And (3) base slurry configuration: 4 wt% bentonite slurry +0.2 wt% xanthan gum +0.4 wt% high viscosity sodium carboxymethyl cellulose, heavy spar weighting to 1.2g/cm 3 。
Experimental pulp preparation and testing: and respectively adding 2 weight percent of evaluation sample into the experimental base slurry, uniformly stirring at a high speed, and carrying out heat rolling aging at 120 ℃ for 16 hours.
Sand bed filtration test: pouring 40-60 mesh quartz sand into a cylindrical visual drilling fluid cup of a drilling fluid sand bed filter loss instrument, paving, compacting, keeping the height of the sand bed (20.0+/-1.0) cm, taking aged experimental slurry, stirring for 20min, slowly pouring 500mL of prepared experimental slurry, tightening a cup cover, opening a lower valve rod, switching on an air source, slowly adjusting the pressure to 0.69MPa, opening an upper valve rod, keeping for 30min, and measuring the maximum invasion depth and leakage of the sand bed.
(9) The drilling fluid is used for evaluating the crack plugging performance:
the testing method comprises the following steps: using GB-T29170-2012: testing the drilling fluid in the petroleum and natural gas industry.
And (3) base slurry configuration: 4 wt% bentonite slurry +0.2 wt% xanthan gum +0.4 wt% high viscosity sodium carboxymethyl cellulose, heavy spar weighting to 1.2g/cm 3 。
Experimental pulp preparation and testing: the fiber reinforced plugging material (S1, S2, S3 and S4) for drilling fluid is matched with a High Temperature and High Pressure (HTHP) plugging simulation experiment device, preferably bridging filling particles and elastic rubber particles, to construct plugging slurry for different opening cracks, and after heat rolling aging for 16 hours at 120 ℃, the plugging performance of the plugging slurry on 1-4mm opening wedge-shaped cracks is tested.
The raw material specifications and manufacturers referred to in the following examples are as follows:
calcium carbonate raw material: the powder is 1000-1500 meshes, and is obtained by sieving and sorting when in use, and the brand is CC-2, and is purchased from Dongying stone Innovative technology Co., ltd;
stearic acid: SA-1865, an industrial grade, from Qingdao Xup Ind;
polypropylene resin: density less than 0.95g/cm 3 The melting point is less than 170 ℃, the processing grade is wire drawing grade, the brand is K9026, and the product is purchased from Jinlong plastics Limited company in the coastal state;
silane coupling agent: SCA-1613 and SCA-903, available from Zhang Jiang Kong, national Tai Hua Rong New chemical materials Co., ltd;
plant plugging agent: walnut shell powder, coconut shell powder and apricot shell powder are prepared by airing, grinding and sieving raw materials of walnut shell, coconut shell and apricot shell respectively and independently, and are purchased from Dongying stone Innovative technology Co., ltd;
calcium carbonate filler: the calcium carbonate particles are 100-2000 meshes, when in use, the calcium carbonate particles with different particle diameters are sieved and separated, and grading is carried out according to a certain mode, and the grade GDJ is purchased from Dongying stone Innovative technology Co., ltd;
asphalt: sulfonated asphalt (FT-1), natural asphalt (NFT-1), and coal tar asphalt (CFT-1), available from Dongying stone Innovative technology Co., ltd;
rubber filler: the tire rubber is rubber particles with different particle diameters, which are prepared by granulating waste tires, are screened and separated when in use, and the rubber particles with different particle diameters are graded according to a certain mode, and are purchased from SDRUB-1 produced by Dongying stone Innovative technology Co., ltd;
the styrene-butadiene rubber is sieved and separated when in use, and rubber particles with different particle diameters are graded according to a certain mode, and the brand SBR1500 is purchased from Shanghai Duokang industries, inc.
Example 1
1. Preparation of modified Polypropylene fibers
(1) 50g of calcium carbonate raw material (1200 meshes, CC-2) is weighed, poured into a three-neck flask, 500mL of distilled water is added, the three-neck flask is placed in a water bath kettle for heating and stirring, the heating temperature is 90 ℃, after stirring for 20min, 1.5g of stearic acid (SA-1865) is added for activation modification, after stirring for 60 min, heating and stirring are stopped, suction filtration is carried out by a vacuum pump, and then the three-neck flask is placed in an oven for drying (100 ℃), so that the superfine calcium carbonate is obtained.
(2) Mixing 20g of superfine calcium carbonate and 80g of polypropylene resin (K9026), adding into a double-screw extruder, carrying out melt blending at 200 ℃ for 30min, extruding, granulating, drying in a 100 ℃ oven for 12h, and carrying out melt spinning to obtain the filled polypropylene fiber.
(3) Preparing a silane coupling agent (SCA-1613) into a 2 wt% dilute solution by using absolute ethyl alcohol, soaking the filled polypropylene fibers in the dilute solution, heating to 50 ℃ for 40min, cooling, refluxing and washing with clear water for 2h to remove the redundant silane coupling agent on the surfaces of the fibers, and drying to obtain the modified polypropylene fibers. And then processed into a length of 6mm by a cutting machine.
2. Fiber reinforced plugging material for preparing drilling fluid
According to the weight percentage, 10 weight percent of modified polypropylene fiber (diameter 30 mu m, length 6 mm), 10 weight percent of walnut shell powder (100 meshes), 10 weight percent of calcium carbonate particles (100-300 meshes), 10 weight percent of calcium carbonate particles (300-500 meshes), 10 weight percent of calcium carbonate particles (500-1000 meshes), 10 weight percent of calcium carbonate particles (1000-2000 meshes), 20 weight percent of sulfonated asphalt (FT-1), 10 weight percent of tire rubber (500-1000 meshes), SDRUB-1 and 10 weight percent of tire rubber (1000-2000 meshes) are stirred and mixed to prepare the fiber reinforced plugging material S1 for drilling fluid.
Example 2
According to the method of example 1, except that 10 wt% of modified polypropylene fiber (diameter: 30 μm, length: 12 mm), 10 wt% of walnut shell powder (100 mesh), 10 wt% of calcium carbonate particles (100-300 mesh size), 10 wt% of calcium carbonate particles (300-500 mesh size), 10 wt% of calcium carbonate particles (500-1000 mesh size), 10 wt% of calcium carbonate particles (1000-2000 mesh size), 20 wt% of sulfonated asphalt, 10 wt% of tire rubber (500-1000 mesh size) and 10 wt% of tire rubber (1000-2000 mesh size) were mixed and stirred to prepare the fiber-reinforced plugging material S2 for drilling fluids.
Example 3
According to the method of example 1, except that 20 wt% of modified polypropylene fiber (diameter: 30 μm, length: 6 mm), 10 wt% of walnut shell powder (100 mesh), 5 wt% of calcium carbonate particles (100-300 mesh size), 10 wt% of calcium carbonate particles (300-500 mesh size), 10 wt% of calcium carbonate particles (500-1000 mesh size), 10 wt% of calcium carbonate particles (1000-2000 mesh size), 20 wt% of sulfonated asphalt, 5 wt% of tire rubber (500-1000 mesh size) and 10 wt% of tire rubber (1000-2000 mesh size) were mixed and stirred to prepare the fiber-reinforced plugging material S3 for drilling fluids.
Example 4
1. Preparation of modified Polypropylene fibers
(1) 50g of superfine calcium carbonate (1200 meshes) is weighed, poured into a three-neck flask, 100mL of distilled water is added, the three-neck flask is placed into a water bath kettle for heating and stirring, the heating temperature is 90 ℃, 2g of stearic acid is added for activation modification after stirring for 30min, heating and stirring are stopped after stirring for 60 min, suction filtration is carried out by a vacuum pump, and the modified superfine calcium carbonate is placed into an oven for drying (100 ℃) after suction filtration, thus obtaining the modified superfine calcium carbonate.
(2) Mixing 20g of modified superfine calcium carbonate and 100g of polypropylene resin particles, adding into a double-screw extruder, carrying out melt blending for 30min at 200 ℃, extruding, granulating, drying in a 90 ℃ oven for 24h, and carrying out melt spinning to obtain the filled polypropylene fiber.
(3) Preparing a silane coupling agent (SCA-903) into a 3% dilute solution by using absolute ethyl alcohol, soaking the filled polypropylene fiber into the dilute solution, heating to 60 ℃ for 50min, cooling, refluxing and washing for 2h by using clear water to remove the redundant silane coupling agent on the surface of the fiber, and drying to obtain the modified polypropylene fiber. And then processed into a length of 6mm by a cutting machine.
2. Fiber reinforced plugging material for preparing drilling fluid
According to the weight percentage, 30 weight percent of modified polypropylene fiber (diameter 30 mu m, length 6 mm), 20 weight percent of coconut husk powder (100 meshes), 10 weight percent of calcium carbonate particles (100-300 meshes), 10 weight percent of calcium carbonate particles (500-1000 meshes), 10 weight percent of calcium carbonate particles (1000-2000 meshes), 10 weight percent of natural asphalt (NFT-1), 5 weight percent of tire rubber (100-1000 meshes) and 5 weight percent of tire rubber (1000-2000 meshes) are stirred and mixed to prepare the fiber-reinforced plugging material S4 for drilling fluid.
Example 5
1. Preparation of modified Polypropylene fibers
(1) 50g of superfine calcium carbonate (1200 meshes) is weighed, poured into a three-neck flask, 100mL of distilled water is added, the three-neck flask is placed into a water bath kettle for heating and stirring, the heating temperature is 90 ℃, after stirring for 30min, 1g of stearic acid is added for activation modification, after stirring for 60 min, heating and stirring are stopped, suction filtration is carried out by a vacuum pump, and after suction filtration, the modified superfine calcium carbonate is placed into an oven for drying (100 ℃), and the modified superfine calcium carbonate is obtained.
(2) Mixing 20g of modified superfine calcium carbonate and 80g of polypropylene resin particles, adding into a double-screw extruder, carrying out melt blending for 30min at 200 ℃, extruding, granulating, drying in a 100 ℃ oven for 18h, and carrying out melt spinning to obtain the filled polypropylene fiber.
(3) Preparing a silane coupling agent (SCA-903) into a 0.5% dilute solution by using absolute ethyl alcohol, soaking the filled polypropylene fibers in the dilute solution, heating to 60 ℃ for 50min, cooling, refluxing and washing with clear water for 2h to remove the redundant silane coupling agent on the surfaces of the fibers, and drying to obtain the modified polypropylene fibers. And then processed into a length of 6mm by a cutting machine.
2. Fiber reinforced plugging material for preparing drilling fluid
According to the weight percentage, 25 weight percent of modified polypropylene fiber (diameter 30 mu m, length 6 mm), 15 weight percent of apricot shell powder (120 meshes), 5 weight percent of calcium carbonate particles (100-300 meshes), 10 weight percent of calcium carbonate particles (300-500 meshes), 10 weight percent of calcium carbonate particles (500-1000 meshes), 10 weight percent of calcium carbonate particles (1000-2000 meshes), 15 weight percent of coal tar pitch (CFT-1), 5 weight percent of tire rubber (300-500 meshes) and 5 weight percent of styrene-butadiene rubber (1000-2000 meshes, SBR 1500) are stirred and mixed to prepare the fiber reinforced plugging material S5 for the drilling fluid.
Comparative example 1
According to the method of example 1, except that the modified polypropylene fiber was replaced with a conventional polypropylene fiber (length of 3 to 50mm, density < 0.95 g/cm) 3 The diameter is 20-40 mu m), and the finally prepared plugging material is D1.
Comparative example 2
According to the method of example 1, except that, when preparing the fiber-reinforced plugging material for drilling fluid, (1) 50g of ultrafine calcium carbonate (1200 mesh) was weighed, poured into a three-necked flask, 500mL of distilled water was added, the three-necked flask was placed in a water bath, heated and stirred, the heating temperature was 90 ℃, after stirring for 20 minutes, 1.5g of stearic acid was added for activation modification, after stirring for 60 minutes, heating and stirring were stopped, suction filtration was performed by a vacuum pump, and the modified ultrafine calcium carbonate was dried in an oven (100 ℃) after suction filtration, to obtain a modified ultrafine calcium carbonate.
(2) Mixing 20g of modified superfine calcium carbonate and 80g of polypropylene resin particles, adding into a double-screw extruder, carrying out melt blending for 30min at 200 ℃, extruding, granulating, drying in a 100 ℃ oven for 12h, preparing filled polypropylene fibers through melt spinning, and processing into a length of 6mm through a cutting machine, wherein the finally prepared plugging material is D2.
Comparative example 3
According to the method of example 1, except that, when preparing the fiber-reinforced plugging material for drilling fluid, (1) 20g of ultrafine calcium carbonate (1200 mesh) and 80g of polypropylene resin particles were mixed, fed into a twin-screw extruder, melt-blended at 200℃for 30 minutes, extruded, pelletized, dried in an oven at 100℃for 12 hours, and then melt-spun into a filled polypropylene fiber.
(2) Preparing a silane coupling agent into a 2 wt% dilute solution by using absolute ethyl alcohol, soaking the filled polypropylene fiber in the dilute solution, heating the solution to 50 ℃ for 40min, cooling, refluxing and washing the solution for 2h by using clear water to remove the redundant silane coupling agent on the surface of the fiber, and drying the solution to obtain the modified polypropylene fiber. And then the plugging material is processed into a plugging material with the length of 6mm by a cutting machine, and the plugging material is finally prepared into D3.
Comparative example 4
According to the method of example 1, except that, when preparing the fiber-reinforced plugging material for drilling fluid, (1) 20g of modified ultrafine calcium carbonate and 30g of polypropylene resin particles were mixed, fed into a twin-screw extruder, melt-blended at 200℃for 30 minutes, extruded, pelletized, dried in an oven at 100℃for 12 hours, and then melt-spun into a filled polypropylene fiber.
(2) Preparing a silane coupling agent into a 2 wt% dilute solution by using absolute ethyl alcohol, soaking the filled polypropylene fiber in the dilute solution, heating the solution to 50 ℃ for 40min, cooling, refluxing and washing the solution for 2h by using clear water to remove the redundant silane coupling agent on the surface of the fiber, and drying the solution to obtain the modified polypropylene fiber. And then the plugging material is processed into a plugging material with the length of 6mm by a cutting machine, and the plugging material is finally prepared into D4.
Comparative example 5
According to the method of example 1, except that, when preparing the fiber-reinforced plugging material for drilling fluids, 5 wt% of modified polypropylene fibers (diameter: 30 μm, length: 6 mm), 15 wt% of walnut shell powder (100 mesh), 10 wt% of calcium carbonate particles (100-300 mesh size), 10 wt% of calcium carbonate particles (300-500 mesh size), 10 wt% of calcium carbonate particles (500-1000 mesh size), 10 wt% of calcium carbonate particles (1000-2000 mesh size), 20 wt% of sulfonated asphalt, 10 wt% of tire rubber (500-1000 mesh size) and 10 wt% of tire rubber (1000-2000 mesh size) were mixed by stirring to prepare the fiber-reinforced plugging material for drilling fluids, and the final plugging material was D5.
Comparative example 6
According to the method of example 1, except that 10 wt% of modified polypropylene fiber (diameter: 30 μm, length: 6 mm), 10 wt% of walnut shell powder (100 mesh), 40 wt% of calcium carbonate particles (800 mesh), 20 wt% of sulfonated asphalt, 10 wt% of tire rubber (500-1000 mesh size) and 10 wt% of tire rubber (1000-2000 mesh size) were mixed in terms of weight percentage to prepare a fiber-reinforced plugging material for drilling fluids, and the plugging material finally prepared was D6.
Comparative example 7
According to the method of example 1, except that 10 wt% of modified polypropylene fiber (diameter: 30 μm, length: 6 mm), 10 wt% of walnut shell powder (100 mesh), 10 wt% of calcium carbonate particles (100-300 mesh size), 10 wt% of calcium carbonate particles (300-500 mesh size), 10 wt% of calcium carbonate particles (500-1000 mesh size), 10 wt% of calcium carbonate particles (1000-2000 mesh size), 20 wt% of sulfonated asphalt, and 20 wt% of tire rubber (1000 mesh size) were mixed in terms of weight percentage to prepare a fiber-reinforced plugging material for drilling fluid, and the plugging material was finally prepared as D7.
The results of the above experiments on the dispersibility in water, the breaking strength and the chemical stability of the polypropylene fibers in examples 1 to 5 and comparative examples 1 to 7 are shown in Table 1, and the appearance, the water content and the shear strength of the fiber-reinforced plugging material for drilling fluids are shown in Table 2.
TABLE 1
TABLE 2
Table 2 (subsequent)
As is clear from Table 1, the modified polypropylene fibers obtained by the method of the present application can be uniformly dispersed in water (as shown in FIG. 1), and the unmodified polypropylene fibers of comparative example 1 (as shown in FIG. 2) are easily agglomerated in water, and the modified polypropylene fibers of comparative example 2 are also easily agglomerated and cannot be well dispersed in water. The breaking strength of the modified polypropylene fiber prepared in each example is improved greatly compared with that of the unmodified polypropylene fiber, and if the superfine calcium carbonate is not subjected to stearic acid modification in advance (comparative document 3) or the filled polypropylene fiber is not subjected to silane coupling agent modification (comparative document 2), the improvement range of the breaking strength of the modified polypropylene fiber is smaller.
The modified polypropylene fiber in each embodiment has small mass loss after being soaked in acid solution, alkali solution and salt solution, and does not have the phenomena of softening, yarn breakage and the like.
As can be seen from table 2, the fiber reinforced plugging material for drilling fluids was uniformly mixed to have a gray brown color with a moisture content of less than 10%. The cohesive force of the fiber reinforced plugging material for the drilling fluid is evaluated, and the cohesive force is correspondingly increased along with the increase of the addition amount of the fiber reinforced plugging material. When the fiber content in the mixed sample is increased to a certain degree, the cohesive force of the plugging layer is obviously increased, and the shearing strength is increased. If the polypropylene fiber is not subjected to dispersibility modification, the addition amount of the modified polypropylene fiber in the raw material is small, and the prepared fiber reinforced plugging material for the drilling fluid has low cohesive force.
Application example 1
Preparing drilling fluid:
preparing base slurry: 4% Bentonite slurry, 0.2% xanthan gum, 0.4% high viscosity sodium carboxymethyl cellulose, heavy spar weighting to 1.2g/cm 3 。
Based on the weight of the base slurry, 2 wt% of S1 was added to the base slurry and stirred at high speed.
Application examples 2 to 8
It was 2 wt% S2, 2 wt% S3, 2 wt% S4, 2 wt% S5, 2 wt% D6 and 2 wt% D7, respectively, were added to the base slurry, and the base slurry, respectively.
The results of the rheological fluid loss properties of the drilling fluids of application examples 1 to 5, the sand bed invasion depths and the leakage amounts of the drilling fluids of application examples 1 to 8 are shown in Table 3.
TABLE 3 Table 3
Table 3 (subsequent)
Note that: in table 3, AV is the apparent viscosity of the drilling fluid; PV is the plastic viscosity of the drilling fluid; YP is drilling fluid shear force; the API is the medium pressure water loss of the drilling fluid.
As can be seen from the data in Table 3, after the fiber-reinforced plugging material for drilling fluid is added, the viscosity shear force of the system is slightly increased, and the API water loss is reduced, which shows that the fiber-reinforced plugging material for drilling fluid has less influence on the performance of the drilling fluid and good compatibility. The fiber reinforced plugging material for drilling fluid is added into base slurry, so that the invasion depth of a sand bed can be effectively reduced, and the porous leakage can be effectively plugged.
Application examples 9 to 12
S1, S2, S3 and S4 are respectively matched with bridging filling particles and elastic deformation particles to form plugging formulas, and the plugging formulas are respectively used as application examples 9, 10, 11 and 12 and are subjected to crack plugging experimental evaluation, and are specifically shown in table 4.
TABLE 4 Table 4
/>
Note that: in Table 4, the slit depth was about 10cm, a. Times.b mm, where a represents the width of the slit upper end opening and b represents the width of the slit lower end opening.
As can be seen from the results in Table 4, the fiber reinforced plugging material for drilling fluid can be matched with bridging filling particles and elastic deformation particles to plug millimeter-sized cracks with different opening degrees, fiber distribution is arranged at the positions in the formed plugging layer, and the fiber material is matched with fine granular reinforced plugging material, so that the permeability is further reduced, and the leakage is reduced; due to the fiber toughening effect, the plugging layer formed by the fiber plugging system is more compact, the shear strength of the plugging layer is improved, and the integrity of the bridge plug section can be increased.
In conclusion, the fiber reinforced plugging material for drilling fluid has good compatibility with the drilling fluid and wide applicability, can be added into the drilling fluid in the drilling process without affecting normal drilling, effectively solves the leakage problem of leaky stratum such as pores, microcracks and the like, and can also be compounded with other granular or sheet plugging materials and the like to perform plugging operation of cracks with different opening degrees, thereby improving the plugging capacity and bearing capacity of the fractured stratum.
The preferred embodiments of the present application have been described in detail above, but the present application is not limited thereto. Within the scope of the technical idea of the application, a number of simple variants of the technical solution of the application are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the application, all falling within the scope of protection of the application.
Claims (8)
1. A preparation method of modified polypropylene fiber comprises the following steps of
(1) The superfine calcium carbonate and the polypropylene resin are subjected to blending melt spinning to prepare filled polypropylene fibers;
(2) The surface of the filled polypropylene fiber is modified by a silane coupling agent to prepare modified polypropylene fiber;
the step (1) comprises: mixing superfine calcium carbonate and polypropylene resin according to the mass ratio of 1:4-5, then carrying out melt blending at 180-250 ℃ for 20-40min, extruding, granulating and drying, and then adopting melt spinning to prepare the filled polypropylene fiber;
the step (2) comprises: preparing an ethanol solution with the concentration of 0.5-3 wt% by using a silane coupling agent, soaking the filled polypropylene fiber in the ethanol solution of the silane coupling agent, treating for 30-50min at the temperature of 40-60 ℃, and drying to obtain a modified polypropylene fiber;
in the step (1), the superfine calcium carbonate is prepared by heating and mixing 0.1-0.5g/mL of calcium carbonate solution and stearic acid at 85-100 ℃ for 15-30min, wherein the mass ratio of the calcium carbonate raw material to the stearic acid in the calcium carbonate solution is 25-50:1; the grain size of the calcium carbonate raw material is 1000-1500 meshes.
2. A modified polypropylene fiber produced by the production process according to claim 1, wherein the modified polypropylene fiber has a breaking strength of not less than 480MPa, a diameter of 20 to 40 μm, a length of 3 to 12mm and a density of 1 to 1.1g/cm 3 。
3. A fiber reinforced plugging material for a drilling fluid, wherein the fiber reinforced plugging material for a drilling fluid comprises, based on the total amount of the fiber reinforced plugging material for a drilling fluid: 10-30 wt% of modified polypropylene fiber, 10-20 wt% of plant plugging agent, 30-40 wt% of calcium carbonate filler, 10-20 wt% of asphalt and 10-20 wt% of rubber filler, wherein the modified polypropylene fiber is the modified polypropylene fiber of claim 2.
4. The fiber-reinforced plugging material for drilling fluids according to claim 3, wherein the plant plugging agent is a shell powder; the calcium carbonate filler is a mixture of at least one calcium carbonate particle selected from the group consisting of particles having a particle size in the range of 100-300 mesh, 300-500 mesh, 500-1000 mesh and 1000-2000 mesh; the asphalt is at least one of natural asphalt, coal tar asphalt, sulfonated asphalt and modified asphalt; the rubber filler is a mixture of rubber particles selected from at least one of the particle sizes in the range of 100-300 mesh, 300-500 mesh, 500-1000 mesh and 1000-2000 mesh.
5. The fiber reinforced plugging material for drilling fluids according to claim 4, wherein the nut shell is a nut shell and/or a fruit shell.
6. The fiber-reinforced plugging material for drilling fluids according to claim 4, wherein the rubber particles are at least one selected from the group consisting of natural rubber, tire rubber, styrene-butadiene rubber, butadiene rubber and butyl rubber.
7. A drilling fluid comprising a base slurry and the fiber-reinforced plugging material for a drilling fluid according to any one of claims 3 to 6, wherein the fiber-reinforced plugging material for a drilling fluid is added in an amount of 1 to 4% by weight based on the weight of the base slurry.
8. Use of the drilling fluid of claim 7 in drilling a well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810897394.3A CN110820066B (en) | 2018-08-08 | 2018-08-08 | Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810897394.3A CN110820066B (en) | 2018-08-08 | 2018-08-08 | Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110820066A CN110820066A (en) | 2020-02-21 |
| CN110820066B true CN110820066B (en) | 2023-09-08 |
Family
ID=69540996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810897394.3A Active CN110820066B (en) | 2018-08-08 | 2018-08-08 | Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110820066B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943560B (en) * | 2020-07-17 | 2023-03-28 | 中国石油化工股份有限公司 | Drilling-following leakage stoppage material composition for deep fractured stratum, drilling leakage stoppage slurry thereof, preparation method and supplement time determination method of drilling leakage stoppage slurry |
| CN111925146A (en) * | 2020-08-11 | 2020-11-13 | 衡阳市九州建材有限公司 | Preparation method of concrete expanding agent |
| CN114456778A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Drilling fluid plugging material |
| CN113214806B (en) * | 2021-04-02 | 2022-05-03 | 中国石油大学(华东) | Temperature-sensitive adhesive type bridging leakage blocking system, leakage blocking slurry and preparation method and application thereof |
| CN113173750A (en) * | 2021-04-27 | 2021-07-27 | 西南大学 | Preparation method of antibacterial high-performance fiber concrete |
| CN115806809A (en) * | 2021-09-16 | 2023-03-17 | 天津凯夫特科技有限公司 | Pretreating agent and its treating method and use |
| CN114349440A (en) * | 2022-01-17 | 2022-04-15 | 陕西秦汉恒盛新型建材科技股份有限公司 | Quick-setting, quick-hardening, early-strength and high-strength pavement patching material and preparation method thereof |
| CN115029926B (en) * | 2022-07-13 | 2023-09-22 | 中国石油大学(华东) | Composition and preparation method of fiber grafted expandable resin plugging material and application of fiber grafted expandable resin plugging material in well cementation, leakage prevention and plugging |
| CN115418204B (en) * | 2022-09-22 | 2024-01-30 | 四川金江建材科技有限公司 | Oilfield drilling fluid plugging agent and preparation method thereof |
| CN115872681B (en) * | 2022-12-26 | 2023-09-08 | 浙江龙游通衢建材有限公司 | Modified polypropylene fiber concrete and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232037A (en) * | 2014-08-27 | 2014-12-24 | 克拉玛依市金鑫科技有限公司 | Crack plugging agent for oil-base drilling fluids |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9228122B2 (en) * | 2013-06-05 | 2016-01-05 | Halliburton Energy Services, Inc. | Methods and cement compositions utilizing treated polyolefin fibers |
-
2018
- 2018-08-08 CN CN201810897394.3A patent/CN110820066B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232037A (en) * | 2014-08-27 | 2014-12-24 | 克拉玛依市金鑫科技有限公司 | Crack plugging agent for oil-base drilling fluids |
Non-Patent Citations (1)
| Title |
|---|
| 表面亲水改性聚丙烯纤维的性能研究;刘鸿铭等;《化工时刊》;20171212;第31卷(第12期);第15-18页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110820066A (en) | 2020-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110820066B (en) | Modified polypropylene fiber and preparation method thereof, fiber reinforced plugging material for drilling fluid, drilling fluid and application | |
| Yan et al. | Synthesis and performance measurement of a modified polymer dust suppressant | |
| US10233379B2 (en) | Loss circulation compositions (LCM) having portland cement clinker | |
| CN109810678B (en) | Mud shale stratum plugging agent based on nanofiber compound for drilling fluid and preparation method | |
| CN110872502B (en) | Composite plugging agent for well drilling and application thereof | |
| CN104152125B (en) | A kind of high dehydration solidification pressure-bearing sealing agent | |
| CN108384520B (en) | Degradable fiber plugging agent for drilling fluid and preparation method thereof | |
| RU2011139570A (en) | PAPER FILLER COMPOSITION | |
| CN106398669A (en) | Method for preparing pressure-bearing blocking agent for drilling fluid | |
| CN111662681A (en) | Crusting type dust suppressant and preparation method thereof | |
| CN110372285A (en) | A kind of Organic-inorganic composite rubber regeneration concrete | |
| CN1690161A (en) | Follow-drilling plugging agent and its preparation method and use | |
| CN114672289B (en) | Delayed expansion leakage-proof plugging working solution for crack leakage layer and preparation method thereof | |
| CN104530504A (en) | Rubber composite material of waste cotton material-based nano-microcrystalline cellulose and preparation method of rubber composite material | |
| AU2014296054B2 (en) | Proppants and anti-flowback additives including kaolin clay | |
| US2610149A (en) | Method and means of preventing fluid loss through porous walls | |
| CN109628078A (en) | A kind of preparation method of high deformation type absorbent resin plugging agent material | |
| CN109423262A (en) | A kind of acid-soluble sealing agent, acid-soluble liquid for plugging and preparation method thereof | |
| CN112745815A (en) | Leak-proof leak-stopping material and preparation method thereof | |
| Villada et al. | Cellulose nanofibrils as a replacement for xanthan gum (XGD) in water based muds (WBMs) to be used in shale formations | |
| CN108178571B (en) | High-strength pavement material and preparation method thereof | |
| CN106147746B (en) | Self-suspending proppant applied to clean water fracturing system | |
| CN113898313B (en) | Shale gas horizontal well oil-based drilling fluid collapse-preventing and leakage-stopping construction method | |
| CN110872501B (en) | Plugging agent for well drilling and application thereof | |
| CN116376522A (en) | Ultrahigh-temperature-resistant high-pressure-resistant plugging agent for drilling fluid of deep well of ten thousand meters and application of plugging agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |