CN110820066A - 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
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Abstract
The invention relates to the field of a plugging material for drilling fluid, and in particular relates to a modified polypropylene fiber and a preparation method thereof, a fiber reinforced plugging material for drilling fluid, drilling fluid and application. 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 formed plugging layer, good shear strength, strong bearing capacity, wide applicability and capability of being matched with different base slurries.
Description
Technical Field
The invention relates to the field of a plugging material for drilling fluid, and in particular relates to a modified polypropylene fiber and a preparation method thereof, a fiber reinforced plugging material for drilling fluid, drilling fluid and application.
Background
Drilling is usually performed by matching with a drilling fluid to balance the formation pressure, clean the bottom of a well and carry debris. Conventionally used drilling fluids include clear water, slurry, emulsion and the like, and are used for loose and unstable rock formations with easy collapse and block dropping.
If the stratum has pores, cracks and the like, the drilling fluid cannot meet the requirements, and when the underground operations such as drilling, well cementation, testing and the like are carried out, the shaft working fluid (comprising the drilling fluid, cement paste, completion fluid and the like) is easy to leak into the stratum under the action of pressure difference to form lost circulation. The well leakage rate in the petroleum industry of China is about 20-25% of the total number of wells, and the crack leakage rate is more than 80% of the total well leakage. The crack leakage plugging difficulty is high, and the leakage amount of the drilling fluid is large.
At present, the most effective method for treating fractured leakage is bridge plug leakage stoppage, wherein a leakage stoppage material is mixed in drilling fluid, and the leakage stoppage material is carried into fractures by the drilling fluid to form a plugging layer. The traditional fibrous lost circulation material is mostly selected from plant fiber, animal fiber or mineral fiber, such as sawdust, peanut shell, flax fiber, corn cob, paper fiber, bagasse, cottonseed shell, tree powder, animal hair, asbestos powder, etc. However, the traditional fiber has poor high temperature resistance and acid and alkali resistance, is easy to be coked when plugging is carried out on a high-temperature stratum, and reduces the plugging capability; the traditional fiber is easy to soften after absorbing water, the strength is reduced, the mechanical property is poor, the tensile strength is low, 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 the drilling fluid is poorer, the physical and chemical bonding capability with the plugging material is poorer, and the compact pressure-bearing capability of a plugging layer is influenced; the synthetic fiber has lower elastic modulus and mechanical strength, and the formed plugging layer has poorer shear strength and pressure bearing capability.
Disclosure of Invention
The invention aims to solve the problems of poor shear strength and poor pressure bearing capability of a plugging layer formed by adopting a plugging agent in the prior art, and provides a modified polypropylene fiber and a preparation method thereof, a fiber reinforced plugging material for drilling fluid, drilling fluid and application.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing a modified polypropylene fiber, which comprises (1) blending and melt-spinning ultrafine calcium carbonate and a polypropylene resin to obtain a filled polypropylene fiber; (2) the filled polypropylene fiber is subjected to surface modification by a silane coupling agent to prepare the modified polypropylene fiber.
The second aspect of the invention provides a modified polypropylene fiber prepared by the preparation method, the breaking strength is more than or equal to 480MPa, the diameter is 20-40 mu m, the length is 3-12mm, and the density is 1-1.1g/cm3。
The third aspect of the invention provides a fiber-reinforced plugging material for drilling fluid, which takes the total amount of the fiber-reinforced plugging material for drilling fluid as a reference, and comprises the following components: 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 invention 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 wt% based on the weight of the base slurry.
In a fifth aspect, the invention provides a use of the drilling fluid in drilling.
The modified polypropylene fiber prepared by the invention has good dispersibility in water, high elastic modulus, high tensile strength, acid and alkali resistance and high temperature resistance, and can be uniformly mixed with other raw material components.
The fiber-reinforced plugging material prepared by the invention takes the modified polypropylene fiber as a main body, has better physical and mechanical properties, elastic modulus, tensile strength and corrosion resistance, has better compatibility when being mixed with the plant plugging agent, the calcium carbonate filler, the asphalt and the rubber filler, has better shear strength and pressure 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 fillers, asphalt and rubber fillers, improves the plugging capability of a plugging layer, can also increase the flow resistance of the drilling fluid, and is beneficial to forming the plugging layer in a near-wellbore area of a stratum. The compactness of the formed plugging layer is better, the toughness and the strength of the plugging layer are better, the shear strength of the formed plugging layer is better, and the overall stability is better.
The calcium carbonate filler and the rubber filler in the fiber-reinforced plugging material are mixed in a grading manner respectively, 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 different types of fine granular reinforced plugging materials are matched with other granular and flaky plugging materials through synergistic effect, so that the plugging capability and the bearing capability of a fractured stratum are improved, and the technical requirements of fracture leakage compact bearing plugging at different openings are met.
The fiber reinforced plugging material for the drilling fluid, which is prepared by the invention, has the advantages of low cost of raw materials, simple and convenient preparation method and simple field application process. The plugging agent has wide applicability, can be added into drilling fluid in the process of drilling while drilling without influencing normal drilling, effectively solves the problem of leakage of seepage strata such as pores, microcracks and the like, can be matched with other granular and flaky plugging materials to perform plugging operation of fractures with different opening degrees, and improves the pressure bearing capacity of the strata.
Drawings
FIG. 1 is an optical photograph of an unmodified polypropylene fiber dispersed in water;
fig. 2 is an optical photograph of the modified polypropylene fiber dispersed in water.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The first aspect of the invention provides a preparation method of modified polypropylene fiber, which comprises the steps of (1) preparing filling polypropylene fiber by blending, melting and spinning superfine calcium carbonate and polypropylene resin; (2) the filled polypropylene fiber is subjected to surface modification by a silane coupling agent to prepare the modified polypropylene fiber.
In the invention, the superfine calcium carbonate and the polypropylene resin are blended and melt-spun in advance, so that the heat resistance, the mechanical strength and the toughness of the polypropylene fiber are improved, and the heat distortion temperature of the polypropylene fiber is reduced. The filled polypropylene fiber is modified by the silane coupling agent, so that the crack defect on the surface of the filled 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 invention, in the step (1), the superfine calcium carbonate and the polypropylene resin are mixed according to the mass ratio of 1:4-5, and are subjected to melt blending at the temperature of 180 ℃ and 250 ℃ for 20-40min to be extruded and granulated, and then are dried to prepare the filling polypropylene fiber by adopting melt spinning.
In the present invention, the kind of the polypropylene resin is not particularly limited, and the density is satisfied to be less than 0.95g/cm3The melting point is less than 170 ℃, and the processing grade is wire drawing grade. The mixing method of the ultrafine calcium carbonate and the polypropylene resin is not particularly limited, and the ultrafine calcium carbonate and the polypropylene resin can be sufficiently and uniformly mixed. The method for carrying out melt spinning on the mixture of the ultrafine calcium carbonate and the polypropylene resin is not limited, the spinning speed is 1800-3200m/min, the number of spinning heads is 8, the ultrafine calcium carbonate and the polypropylene resin are mixed according to the proportion, the obtained filled polypropylene fiber meets the conditions 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 invention, in the step (2), the silane coupling agent is prepared into 0.5-3 wt% ethanol solution, the filled polypropylene fiber is soaked in the silane coupling agent ethanol solution (the volume of the solution is taken as a reference, the adding amount of the filled polypropylene fiber is 0.02g/mL), the treatment is carried out for 30-50min at the temperature of 40-60 ℃, and the modified polypropylene fiber is prepared after drying.
In the present invention, the silane coupling agent is not particularly limited and may be a vinyl silane coupling agent or a methoxysilane such as vinyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, and SCA-1613 or SCA-903 may be selected. The amount of the ethanol solution of the filled polypropylene fibers and the silane coupling agent is not particularly limited, so long as the filled polypropylene fibers can be immersed in the ethanol solution of the silane coupling agent. The drying temperature of the filled polypropylene fiber after modification with the silane coupling agent is not particularly limited as long as solvent evaporation can be achieved.
According to the invention, in the step (1), the superfine calcium carbonate is prepared by heating and mixing 0.1-0.5g/mL calcium carbonate solution and stearic acid at 85-100 ℃ for 15-30min, and 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 selected from SA-1865, industrial grade first grade product.
The superfine calcium carbonate is prepared by modifying calcium carbonate raw materials with stearic acid in advance, so that the uniform mixing degree of the superfine calcium carbonate and the polypropylene resin is improved, and the mechanical strength and the toughness of the filled polypropylene fiber are improved.
According to the invention, the particle size of the calcium carbonate raw material is 1000-1500 meshes, and is preferably 1200 meshes. When the calcium carbonate raw material with the particle size within 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 requirement for improving the mechanical strength of the polypropylene fiber cannot be met; if the particle size is too small, the particles are easy to agglomerate, which is not beneficial to the mixing of the superfine calcium carbonate and the polypropylene resin.
The second aspect of the invention provides a modified polypropylene fiber prepared by the preparation method, the prepared modified polypropylene fiber 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/cm3。
The third aspect of the present invention provides a fiber-reinforced plugging material for drilling fluid, wherein the total amount of the fiber-reinforced plugging material for drilling fluid is taken as a reference, the fiber-reinforced plugging material for drilling fluid comprises: 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 invention, the plant plugging agent is selected from fruit shell powder; preferably the shell is a nutshell and/or a fruit shell. The nutshell is preferably walnut shell, apricot shell or other hard shell nutshell, and the fruit shell is preferably cherry shell, coconut shell, durian shell or other hard shell fruit shell. When in use, the fruit shell is ground to 80-120 meshes, preferably 100 meshes. 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 shell powder is poor in mixing effect with other raw materials.
According to the invention, the calcium carbonate filler is a mixture of particles with the particle size of at least one of the ranges of 100-300 meshes, 300-500 meshes, 500-1000 meshes and 1000-2000 meshes. 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, discontinuous or continuous open-graded mixing before mixing with other components. For example, based on the total amount of the calcium carbonate filler, 100-mesh and 300-mesh calcium carbonate particles, 300-mesh and 500-mesh calcium carbonate particles, 500-mesh and 1000-mesh and 2000-mesh calcium carbonate particles are respectively selected and uniformly mixed, and then are mixed with other components. When calcium carbonate particles with different particle sizes are mixed, the blocking layer is more compact, and the leakage can be further reduced.
According to the present invention, the asphalt is selected from at least one of natural asphalt, coal tar asphalt, sulfonated asphalt, and modified asphalt. The asphalt to be selected in the present invention is not particularly limited as long as it satisfies the requirement of a softening point of 80 to 150 ℃. The asphalt is softened asphalt, the softened points can be deformed under the influence of the formation temperature, and gaps between the plugging layers can be filled under the action of proper pressure difference, so that the plugging effect of the plugging layers is improved.
According to the invention, the rubber filler is a mixture of at least one rubber particle with the particle size in the range of 100-300 meshes, 300-500 meshes, 500-1000 meshes and 1000-2000 meshes. The material of the rubber particles is selected from at least one of natural rubber, tire rubber, styrene butadiene rubber, butadiene rubber and butyl rubber.
The rubber particles graded in any small range of the above ranges can be selected to be mixed with other components, for example, the rubber particles graded in a 100-300 mesh range are selected based on the total amount of the rubber filler and then are fully mixed with other components. It is preferable that rubber particles having different particle diameters within the above range are continuously graded, discontinuously graded, or continuously open-graded mixed, and then mixed with other components. For example, based on the total amount of the rubber filler, 100-mesh 300-mesh rubber particles, 300-mesh 500-mesh rubber particles, 500-mesh 1000-mesh rubber particles and 1000-mesh 2000-mesh rubber particles are respectively selected and uniformly mixed, and then are mixed with other components. The rubber particles have certain elasticity, and when the rubber particles are used, the rubber particles can be self-adaptively filled in gaps in the blocking layer, so that the retention capacity and stability of the blocking layer are improved.
The tire rubber is rubber particles with different particle sizes, which are prepared by granulating waste tires, and can be SDRUB-1 produced by Dongyngshi Dai Innovation science and technology Limited.
The invention 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 wt% based on the weight of the base slurry.
The base pulp is a material commonly used in the prior art, and can be, for example: 4% bentonite slurry, 0.2% xanthan gum and 0.4% high viscosity sodium carboxymethyl cellulose. The plugging material can be uniformly mixed with various base slurries, is not limited to be mixed with only one type of base slurry, has wide applicability, can be added into drilling fluid in the process of drilling, and can be used for plugging cracks with different opening degrees and improving the plugging capacity and the bearing capacity of fractured strata by mixing the base slurry and the drilling fluid according to the proportion.
In a fifth aspect, the invention provides a use of the drilling fluid in drilling.
The drilling fluid can be mixed with other granular or flaky materials to be used as a plugging material, a plugging layer formed by the mixture has higher shear strength, the plugging capability and the bearing capability of the fractured stratum are improved, and the technical requirements of fractured leakage compact bearing plugging with different opening degrees are met.
The present invention will be described in detail below by way of examples. The performance test of the samples in the following examples was carried out as follows:
(1) the dispersibility evaluation of the polypropylene fibers was measured as follows: and cutting the polypropylene fiber sample to be detected into short fiber bundles with the length of 12mm, placing the short fiber bundles into water, stirring for 20min, and observing the fiber dispersion condition.
(2) The fracture strength evaluation of polypropylene fibers was tested as follows: the polypropylene fiber sample to be tested is balanced for 24h under the environment that the temperature is 20 +/-2 ℃ and the humidity is 65%, and then an electronic single fiber strength tester is used for testing the breaking strength of a single fiber, wherein the gauge length is 20mm, the stretching speed is 20mm/min, and the pre-tension is 0.05 cN/dtex. Each sample was tested 50 times, the final result was averaged and the correction factor was 1.
(3) The evaluation of the chemical stability of polypropylene fibers was tested as follows: the quality retention rate and the fiber form 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, 200mL of NaOH solution with pH value of 12 and 200mL of NaCl solution with mineralization degree of 50 g/L; (II) respectively adding 0.4 weight percent of polypropylene fiber samples to be tested into the solution, and uniformly stirring; (III) standing in a water bath kettle at 90 ℃ for 4 h; (IV) rinsing, drying, weighing, calculating the mass retention rate, and observing the morphology of the polypropylene fiber.
(4) Appearance evaluation of the fiber reinforced plugging material for the drilling fluid: 20g of each sample to be tested is taken and placed in a 50mL test tube with a plug, and the color and the shape of the test sample are visually observed under bright light.
(5) Testing the water content of the fiber reinforced plugging material for the drilling fluid: weighing 5g of a sample to be measured by using a weighing bottle with known constant weight, placing the sample in a drying oven with the temperature of 105 +/-2 ℃ for drying for 4h, taking out the sample, placing the dried sample in a drier, cooling for 30min, weighing the sample to 0.01g, and calculating the moisture content of the product according to the following formula. Each example was repeated three times in parallel.
The water content calculation formula is as follows:
wherein S represents moisture, expressed as a percentage; m is1Represents the mass of the sample and the weighing flask in grams (g); m is2The weight of the dried sample and the weight of the weighing bottle are measured in grams (g); m is3In order to weigh the mass of the bottle,the unit is grams (g).
(6) The shear strength evaluation of the fiber reinforced plugging material for the drilling fluid comprises the following steps: adopting a quadruple strain control type direct shear apparatus, mixing calcium carbonate (20-40 meshes) and bentonite (which accords with GB/T5005-2010 standard) according to a volume ratio of 80: 20, uniformly mixing, adding different amounts of fiber reinforced plugging materials for drilling fluid based on the total amount of calcium carbonate and bentonite, uniformly mixing, adding 12.5 percent of water to prepare a mixed sample, and filling the mixed sample into a plastic bag for sealing and maintaining for 24 hours; and (3) placing the prepared sample into a direct shear apparatus, testing the shear strength of the mixed sample, and evaluating the shear strength of the mixed sample by using the cohesion c.
(7) Evaluation of rheology and fluid loss of drilling fluids: GB/T29170-2012 is adopted: and (4) testing the performance of the drilling fluid in the petroleum and natural gas industry. And testing the rheological property and the fluid loss property of the sample to be tested by using a six-speed viscometer and a medium-pressure fluid loss instrument. And then, putting a sample to be tested into a high-temperature aging tank, performing hot roll aging for 16h at 120 ℃, and testing the rheological property and the fluid loss property of the sample by using the same method.
(8) Evaluating the maximum invasion depth and the leakage amount of the drilling fluid sand bed:
the test method comprises the following steps: GB-T29170-2012 is adopted: and (4) testing the performance of the drilling fluid in the petroleum and natural gas industry.
Preparing base slurry: 4% by weight of bentonite slurry + 0.2% by weight of xanthan gum + 0.4% by weight of high-viscosity sodium carboxymethyl cellulose, the weight of barite is increased to 1.2g/cm3。
Preparing and testing experimental slurry: 2% by weight of the evaluation sample was added to the respective test base slurries, stirred at high speed and hot-rolled at 120 ℃ for 16 h.
Sand bed filtration test: pouring quartz sand of 40-60 meshes into a cylindrical visual drilling fluid cup of a drilling fluid sand bed filtration loss instrument, paving and compacting, keeping the height (20.0 +/-1.0) cm of a sand bed, stirring aged experimental slurry for 20min, slowly pouring 500mL of prepared experimental slurry, tightening a cup cover, opening a lower valve rod, connecting 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 loss of the sand bed.
(9) The drilling fluid is used for evaluating the fracture plugging performance:
the test method comprises the following steps: GB-T29170-2012 is adopted: and (4) testing the performance of the drilling fluid in the petroleum and natural gas industry.
Preparing base slurry: 4% by weight of bentonite slurry + 0.2% by weight of xanthan gum + 0.4% by weight of high-viscosity sodium carboxymethyl cellulose, the weight of barite is increased to 1.2g/cm3。
Preparing and testing experimental slurry: the plugging performance of the plugging slurry on wedge-shaped cracks with the opening of 1-4mm is tested after the plugging slurry is aged for 16 hours by hot rolling at 120 ℃ by utilizing a high-temperature high-pressure (HTHP) plugging simulation experiment device, preferably bridging filling particles and elastic rubber particles and matching with the fiber reinforced plugging material (S1, S2, S3 and S4) for the drilling fluid.
The specifications and manufacturers of the raw materials involved in the following examples are as follows:
calcium carbonate raw material: 1000-mesh and 1500-mesh materials, and the materials are screened and sorted when in use, are sold as CC-2 and are purchased from Dongyngshi Dai Innovation technology Co Ltd;
stearic acid: SA-1865, industrial grade first grade, purchased from Qingdao xu (courtesy, import & export, ltd);
polypropylene resin: the density is less than 0.95g/cm3Melting point is less than 170 ℃, processing grade is wire drawing grade, and the mark is K9026, and the wire drawing grade is purchased from Jinlong plastics, LLC of Binzhou;
silane coupling agent: SCA-1613 and SCA-903, from Thailand Rongo chemical New Material Co, Zhang Jia gang;
plant plugging agent: the walnut shell powder, the coconut shell powder and the apricot shell powder are respectively and independently prepared by airing and grinding and sieving raw materials of walnut shells, coconut shells and apricot shells, and are purchased from Dongyngshi big Innovation science and technology Limited company;
calcium carbonate filler: the calcium carbonate particles are 100-mesh and 2000-mesh, are screened and sorted when in use, and are graded according to a certain mode, and are available from Dongyngshi Dai Innovation technology Co Ltd under the brand GDJ;
asphalt: sulfonated asphalt (FT-1), natural asphalt (NFT-1), and coal tar asphalt (CFT-1), available from Dongyngshi Dai Innovation technologies, Inc.;
rubber filler: the tire rubber is rubber particles with different particle sizes, which are prepared by granulating waste tires, and the rubber particles are sieved and sorted when in use, and are graded according to a certain mode, wherein the rubber particles are purchased from SDRUB-1 produced by Dongyngshi Dainagao Innovation science and technology Limited;
the styrene butadiene rubber is screened and sorted when in use, and rubber particles with different particle sizes are graded according to a certain mode, and the styrene butadiene rubber is available from Shanghai Duokang practical Co Ltd under the brand of SBR 1500.
Example 1
1. Preparation of modified Polypropylene fiber
(1) Weighing 50g of calcium carbonate raw material (1200 meshes, CC-2), pouring into a three-neck flask, adding 500mL of distilled water, placing the three-neck flask into a water bath kettle, heating and stirring at 90 ℃, stirring for 20min, adding 1.5g of stearic acid (SA-1865) for activation modification, stirring for 60 min, stopping heating and stirring, performing suction filtration by using a vacuum pump, and then placing into an oven for drying (100 ℃) to obtain the ultrafine calcium carbonate.
(2) Mixing 20g of superfine calcium carbonate and 80g of polypropylene resin (K9026), adding the mixture into a double-screw extruder, performing melt blending for 30min at the temperature of 200 ℃, extruding and granulating, drying in an oven at the temperature of 100 ℃ for 12h, and then performing melt spinning to prepare the filled polypropylene fiber.
(3) Preparing a silane coupling agent (SCA-1613) into a dilute solution with the weight percent of 2 by using absolute ethyl alcohol, soaking filled polypropylene fibers in the dilute solution, heating to 50 ℃, treating for 40min, cooling, washing with clean water under reflux for 2h to remove the excess silane coupling agent on the surfaces of the fibers, and drying to obtain the modified polypropylene fibers. Then processed into 6mm length 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 is 30 μm, length is 6mm), 10 weight percent of walnut shell powder (100 meshes), 10 weight percent of calcium carbonate particle (100-300 meshes of gradation), 10 weight percent of calcium carbonate particle (300-500 meshes of gradation), 10 weight percent of calcium carbonate particle (500-1000 meshes of gradation), 10 weight percent of calcium carbonate particle (1000-2000 meshes of gradation), 20 weight percent of sulfonated asphalt (FT-1), 10 weight percent of tire rubber (500-1000 meshes of gradation, SDRUB-1) and 10 weight percent of tire rubber (1000-2000 meshes of gradation) are stirred and mixed to prepare the fiber reinforced plugging material S1 for the drilling fluid.
Example 2
According to the method of example 1, except that when preparing the fiber reinforced plugging material for drilling fluid, according to the weight percentage, 10 weight percent of modified polypropylene fiber (diameter 30 μm and length 12mm), 10 weight percent of walnut shell powder (100 meshes), 10 weight percent of calcium carbonate particles (100-plus-300 mesh grading), 10 weight percent of calcium carbonate particles (300-plus-500 mesh grading), 10 weight percent of calcium carbonate particles (500-plus-1000 mesh grading), 10 weight percent of calcium carbonate particles (1000-plus-2000 mesh grading), 20 weight percent of sulfonated asphalt, 10 weight percent of tire rubber (500-plus-1000 mesh grading) and 10 weight percent of tire rubber (1000-plus-2000 mesh grading) are stirred and mixed to prepare the fiber reinforced plugging material for drilling fluid S2.
Example 3
According to the method of example 1, except that when preparing the fiber-reinforced plugging material for drilling fluid, according to the weight percentage, 20 weight percent of modified polypropylene fiber (diameter 30 μm, length 6mm), 10 weight percent of walnut shell powder (100 mesh), 5 weight percent of calcium carbonate particles (100-mesh 300 mesh gradation), 10 weight percent of calcium carbonate particles (300-mesh 500 mesh gradation), 10 weight percent of calcium carbonate particles (500-mesh 1000 gradation), 10 weight percent of calcium carbonate particles (1000-mesh 2000 mesh gradation), 20 weight percent of sulfonated asphalt, 5 weight percent of tire rubber (500-mesh 1000 mesh gradation) and 10 weight percent of tire rubber (1000-mesh 2000 gradation) are stirred and mixed to prepare the fiber-reinforced plugging material for drilling fluid S3.
Example 4
1. Preparation of modified Polypropylene fiber
(1) Weighing 50g of superfine calcium carbonate (1200 meshes), pouring into a three-neck flask, adding 100mL of distilled water, placing the three-neck flask into a water bath kettle, heating and stirring, heating to 90 ℃, stirring for 30min, adding 2g of stearic acid for activation modification, stirring for 60 min, stopping heating and stirring, performing suction filtration by using a vacuum pump, placing the modified superfine calcium carbonate into an oven for drying (100 ℃) after suction filtration, and obtaining the modified superfine calcium carbonate.
(2) And (2) mixing 20g of modified superfine calcium carbonate and 100g of polypropylene resin particles, adding the mixture into a double-screw extruder, performing melt blending for 30min at the temperature of 200 ℃, extruding and granulating, drying in a 90 ℃ oven for 24h, and then performing melt spinning to prepare the filled polypropylene fiber.
(3) Preparing a silane coupling agent (SCA-903) into a dilute solution with the concentration of 3% by using absolute ethyl alcohol, soaking filled polypropylene fibers in the solution, heating the solution to 60 ℃, treating the solution for 50min, cooling the solution, washing the cooled solution with clear water in a refluxing manner for 2h to remove the excess silane coupling agent on the surfaces of the fibers, and drying the solution to obtain the modified polypropylene fibers. Then processed into 6mm length 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 is 30 mu m, length is 6mm), 20 weight percent of coconut shell powder (100 meshes), 10 weight percent of calcium carbonate particle (100-300 meshes of gradation), 10 weight percent of calcium carbonate particle (500-1000 meshes of gradation), 10 weight percent of calcium carbonate particle (1000-2000 meshes of gradation), 10 weight percent of natural asphalt (NFT-1), 5 weight percent of tire rubber (100-1000 meshes of gradation) and 5 weight percent of tire rubber (1000-2000 meshes of gradation) are stirred and mixed to prepare the fiber reinforced plugging material S4 for the drilling fluid.
Example 5
1. Preparation of modified Polypropylene fiber
(1) Weighing 50g of superfine calcium carbonate (1200 meshes), pouring into a three-neck flask, adding 100mL of distilled water, placing the three-neck flask into a water bath kettle, heating and stirring, heating to 90 ℃, stirring for 30min, adding 1g of stearic acid for activation modification, stirring for 60 min, stopping heating and stirring, performing suction filtration by using a vacuum pump, placing the modified superfine calcium carbonate into an oven for drying (100 ℃) after suction filtration, and obtaining the modified superfine calcium carbonate.
(2) And (2) mixing 20g of modified superfine calcium carbonate and 80g of polypropylene resin particles, adding the mixture into a double-screw extruder, performing melt blending for 30min at the temperature of 200 ℃, extruding and granulating, drying in an oven at the temperature of 100 ℃ for 18h, and then performing melt spinning to prepare 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 fiber in the solution, heating to 60 ℃, treating for 50min, cooling, washing with clear water under reflux for 2h to remove the excess silane coupling agent on the surface of the fiber, and drying to obtain the modified polypropylene fiber. Then processed into 6mm length 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 μm, length 6mm), 15 weight percent of apricot shell powder (120 meshes), 5 weight percent of calcium carbonate particle (100-300 mesh gradation), 10 weight percent of calcium carbonate particle (300-500 mesh gradation), 10 weight percent of calcium carbonate particle (500-1000 mesh gradation), 10 weight percent of calcium carbonate particle (1000-2000 mesh gradation), 15 weight percent of coal tar pitch (CFT-1), 5 weight percent of tire rubber (300-500 mesh gradation) and 5 weight percent of styrene butadiene rubber (1000-2000 mesh gradation, SBR1500) 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 is replaced by the common polypropylene fiber (the length is 3-50mm, and the density is less than 0.95 g/cm) when the fiber reinforced plugging material for the drilling fluid is prepared3And 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 the drilling fluid, (1) 50g of ultrafine calcium carbonate (1200 meshes) is weighed and poured into a three-neck flask, 500mL of distilled water is added, the three-neck flask is placed in a water bath to be heated and stirred, the heating temperature is 90 ℃, after stirring for 20min, 1.5g 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 ultrafine calcium carbonate is placed in an oven to be dried (100 ℃) to obtain the modified ultrafine calcium carbonate.
(2) Mixing 20g of modified superfine calcium carbonate and 80g of polypropylene resin particles, adding the mixture into a double-screw extruder, performing melt blending for 30min at the temperature of 200 ℃, extruding and granulating, drying the mixture in a drying oven at the temperature of 100 ℃ for 12h, then preparing filled polypropylene fibers by melt spinning, and processing the filled polypropylene fibers into a length of 6mm by a cutting machine, wherein the finally prepared plugging material is D2.
Comparative example 3
According to the method of the embodiment 1, except that when preparing the fiber reinforced plugging material for the drilling fluid, (1) 20g of ultrafine calcium carbonate (1200 meshes) and 80g of polypropylene resin particles are mixed, added into a double-screw extruder, extruded and granulated after being melted and blended for 30min at the temperature of 200 ℃, dried in an oven at the temperature of 100 ℃ for 12h, and then melt-spun to prepare the filled polypropylene fiber.
(2) Preparing a silane coupling agent into a dilute solution with the weight percent of 2 by using absolute ethyl alcohol, soaking the filled polypropylene fiber in the solution, heating the solution to 50 ℃, treating the solution for 40min, cooling the solution, washing the cooled solution by using clear water in a refluxing manner for 2h to remove the excess silane coupling agent on the surface of the fiber, and drying the fiber to obtain the modified polypropylene fiber. And then the mixture is processed into 6mm in length by a cutting machine, and the finally prepared plugging material is D3.
Comparative example 4
According to the method of the embodiment 1, except that when preparing the fiber reinforced plugging material for the drilling fluid, (1) 20g of modified superfine calcium carbonate and 30g of polypropylene resin particles are mixed, added into a double-screw extruder, and subjected to melt blending at 200 ℃ for 30min, then extruded and granulated, and then dried in an oven at 100 ℃ for 12h, and finally the filled polypropylene fiber is prepared through melt spinning.
(2) Preparing a silane coupling agent into a dilute solution with the weight percent of 2 by using absolute ethyl alcohol, soaking the filled polypropylene fiber in the solution, heating the solution to 50 ℃, treating the solution for 40min, cooling the solution, washing the cooled solution by using clear water in a refluxing manner for 2h to remove the excess silane coupling agent on the surface of the fiber, and drying the fiber to obtain the modified polypropylene fiber. And then the mixture is processed into 6mm in length by a cutting machine, and the finally prepared plugging material is D4.
Comparative example 5
According to the method of example 1, except that when preparing the fiber reinforced plugging material for the drilling fluid, according to the weight percentage, 5 weight percent of modified polypropylene fiber (with the diameter of 30 μm and the length of 6mm), 15 weight percent of walnut shell powder (100 meshes), 10 weight percent of calcium carbonate particles (100-plus-300 mesh grading), 10 weight percent of calcium carbonate particles (300-plus-500 mesh grading), 10 weight percent of calcium carbonate particles (500-plus-1000 mesh grading), 10 weight percent of calcium carbonate particles (1000-plus-2000 mesh grading), 20 weight percent of sulfonated asphalt, 10 weight percent of tire rubber (500-plus-1000 mesh grading) and 10 weight percent of tire rubber (1000-plus-2000 mesh grading) are stirred and mixed to prepare the fiber reinforced plugging material for the drilling fluid, and the finally prepared plugging material is D5.
Comparative example 6
According to the method of the embodiment 1, except that when the fiber reinforced plugging material for the drilling fluid is prepared, according to the weight percentage, 10 weight percent of modified polypropylene fiber (with the diameter of 30 μm and the length of 6mm), 10 weight percent of walnut shell powder (100 meshes), 40 weight percent of calcium carbonate particles (800 meshes), 20 weight percent of sulfonated asphalt, 10 weight percent of tire rubber (500-2000-mesh gradation) and 10 weight percent of tire rubber (1000-2000-mesh gradation) are taken and stirred and mixed to prepare the fiber reinforced plugging material for the drilling fluid, and the finally prepared plugging material is D6.
Comparative example 7
According to the method of the embodiment 1, except that when the fiber-reinforced plugging material for the drilling fluid is prepared, according to the weight percentage, 10 weight percent of modified polypropylene fiber (with the diameter of 30 μm and the length of 6mm), 10 weight percent of walnut shell powder (100 meshes), 10 weight percent of calcium carbonate particles (100-mesh 300-mesh gradation), 10 weight percent of calcium carbonate particles (300-mesh 500-mesh gradation), 10 weight percent of calcium carbonate particles (500-mesh 1000-mesh gradation), 10 weight percent of calcium carbonate particles (1000-mesh 2000-mesh gradation), 20 weight percent of sulfonated asphalt and 20 weight percent of tire rubber (1000 meshes) are stirred and mixed to prepare the fiber-reinforced plugging material for the drilling fluid, and the finally prepared plugging material is D7.
The results of the tests 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 results of the tests on the appearance, the water content and the shear strength of the fiber-reinforced plugging material for drilling fluid are shown in table 2.
TABLE 1
TABLE 2
Table 2 (continuation)
As can be seen from Table 1, the modified polypropylene fiber obtained by the method of the present invention can be uniformly dispersed in water (as shown in FIG. 1), the unmodified polypropylene fiber in comparative example 1 (as shown in FIG. 2) is easily agglomerated in water, and the modified polypropylene fiber in comparative example 2 is also easily agglomerated and cannot be well dispersed in water. The breaking strength of the modified polypropylene fibers obtained in the examples is much improved compared with that of the unmodified polypropylene fibers, and if the superfine calcium carbonate is not modified by stearic acid in advance (comparative document 3) or the filled polypropylene fibers are not modified by the silane coupling agent (comparative document 2), the breaking strength of the modified polypropylene fibers is improved to a small extent.
In each embodiment, the modified polypropylene fiber has small mass loss after being soaked in acid solution, alkali solution and salt solution, and does not soften, break filaments and the like.
As shown in Table 2, the fiber-reinforced plugging material for drilling fluid is grayish brown after being uniformly mixed, and has a water content of less than 10%. The cohesion of the fiber reinforced plugging material for the drilling fluid is evaluated, and the cohesion 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 blocking layer is obviously increased, and the shear strength is increased. If the polypropylene fiber is not subjected to dispersive modification and the addition amount of the modified polypropylene fiber in the raw materials is less, the prepared fiber reinforced plugging material for the drilling fluid has lower cohesive force.
Application example 1
Preparing a drilling fluid:
preparing base slurry: 4% bentonite slurry, 0.2% xanthan gum, 0.4% high viscosity sodium carboxymethyl cellulose, and barite is weighted to 1.2g/cm3。
Based on the weight of the base slurry, 2 wt% of S1 was added to the base slurry, and the mixture was stirred at high speed.
Application examples 2 to 8
This is achieved by adding 2% by weight of S2 to the base stock, 2% by weight of S3 to the base stock, 2% by weight of S4 to the base stock, 2% by weight of S5 to the base stock, 2% by weight of D5 to the base stock, 2% by weight of D6 to the base stock and 2% by weight of D7 to the base stock, respectively.
The results of the rheological fluid loss properties of the drilling fluids of application examples 1-5, the sand bed invasion depth and the leakage of the drilling fluids of application examples 1-8 are shown in table 3.
TABLE 3
Table 3 (continuation)
Note: in table 3, AV is the drilling fluid apparent viscosity; PV is the drilling fluid plastic viscosity; YP is drilling fluid cutting force; API is the amount of lost water under pressure in the drilling fluid.
As can be seen from the data in Table 3, after the fiber reinforced plugging material for the drilling fluid is added, the system viscosity shear force is slightly increased, and the API water loss is reduced, which shows that the fiber reinforced plugging material for the drilling fluid has small influence on the performance of the drilling fluid and has good compatibility. The fiber reinforced plugging material for the drilling fluid is added into the base slurry, so that the invasion depth of a sand bed can be effectively reduced, and the plugging can be effectively carried out aiming at the porosity leakage.
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 which are respectively used as application examples 9, 10, 11 and 12, and crack plugging experimental evaluation is carried out on the plugging formulas, and the specific results are shown in Table 4.
TABLE 4
Note: in Table 4, the depth of the crack is about 10cm, and a x b mm, a represents the width of the opening at the upper end of the crack, and b represents the width of the opening at the lower end of the crack.
The results in table 4 show that the fiber reinforced plugging material for drilling fluid can be matched with bridging filling particles and elastic deformation particles to plug millimeter-scale cracks with different openings, fiber distribution is formed at the inner part of a formed plugging layer, and the fiber material is matched with the superfine particle reinforced plugging material to further reduce the permeability and reduce the leakage; due to the toughening effect of the fibers, a plugging layer formed by the fiber plugging system is more compact, the shear strength of the plugging layer is improved, and the integrity of a bridge plug section can be improved.
In conclusion, the fiber reinforced plugging material for the drilling fluid has good compatibility with the drilling fluid and wide applicability, can be added into the drilling fluid in the process of drilling without influencing normal drilling, effectively solves the problem of leakage of seepage strata such as pores, microcracks and the like, can be compounded with other granular and flaky plugging materials to perform plugging operation of fractures with different opening degrees, and improves the plugging capability and the pressure-bearing capability of the fracture strata.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A process for preparing modified polypropylene fibre includes such steps as
(1) The superfine calcium carbonate and the polypropylene resin are blended, melted and spun to prepare filled polypropylene fiber;
(2) the filled polypropylene fiber is subjected to surface modification by a silane coupling agent to prepare the modified polypropylene fiber.
2. The production method according to claim 1, wherein the step (1) includes: mixing the superfine calcium carbonate and the polypropylene resin according to the mass ratio of 1:4-5, then performing melt blending at the temperature of 180 ℃ and 250 ℃ for 20-40min, then extruding, granulating and drying, and then preparing the filled polypropylene fiber by adopting melt spinning.
3. The production method according to claim 1, wherein the step (2) includes: preparing 0.5-3 wt% ethanol solution with silane coupling agent, soaking filled polypropylene fiber in the ethanol solution with silane coupling agent, treating at 40-60 deg.C for 30-50min, and oven drying to obtain modified polypropylene fiber.
4. The preparation method according to any one of claims 1 to 3, wherein in the step (1), the ultrafine calcium carbonate is prepared by heating and mixing 0.1 to 0.5g/mL of calcium carbonate solution and stearic acid at 85 to 100 ℃ for 15 to 30min, and the mass ratio of the calcium carbonate raw material to the stearic acid in the calcium carbonate solution is 25 to 50: 1; the particle size of the calcium carbonate raw material is 1000-1500 meshes.
5. The modified polypropylene fiber prepared by the preparation method of any one of claims 1 to 4, 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/cm3。
6. The fiber reinforced plugging material for the drilling fluid comprises the following components in percentage by weight based on the total amount of the fiber reinforced plugging material for the 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 in claim 5.
7. The fiber-reinforced plugging material for the drilling fluid as claimed in claim 6, wherein the plant plugging agent is fruit shell powder; preferably the shell is a nutshell and/or a fruit shell; the calcium carbonate filler is a mixture of at least one calcium carbonate particle with the particle size in the range of 100-300 meshes, 300-500 meshes, 500-1000 meshes and 1000-2000 meshes; the asphalt is selected from at least one of natural asphalt, coal tar asphalt, sulfonated asphalt and modified asphalt; the rubber filler is a mixture of at least one rubber particle with the particle size in the range of 100-300 meshes, 300-500 meshes, 500-1000 meshes and 1000-2000 meshes.
8. The fiber reinforced plugging material for drilling fluid as recited in claim 7, wherein the rubber particles are made of at least one selected from the group consisting of natural rubber, tire rubber, styrene butadiene rubber, butadiene rubber and butyl rubber.
9. A drilling fluid, which comprises base slurry and the fiber reinforced plugging material for the drilling fluid as claimed in any one of claims 6 to 8, wherein the addition amount of the fiber reinforced plugging material for the drilling fluid is 1 to 4 percent by weight based on the weight of the base slurry.
10. Use of the drilling fluid of claim 9 in drilling wells.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113173750A (en) * | 2021-04-27 | 2021-07-27 | 西南大学 | Preparation method of antibacterial high-performance fiber concrete |
| CN113214806A (en) * | 2021-04-02 | 2021-08-06 | 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 |
| CN113943560A (en) * | 2020-07-17 | 2022-01-18 | 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 |
| 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 |
| CN114456778A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Drilling fluid plugging material |
| CN115029926A (en) * | 2022-07-13 | 2022-09-09 | 中国石油大学(华东) | Fiber grafted expandable resin plugging material composition, preparation method and application thereof in well cementation, leakage prevention and plugging |
| CN115418204A (en) * | 2022-09-22 | 2022-12-02 | 四川金江建材科技有限公司 | Plugging agent for oil field drilling fluid and preparation method thereof |
| 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 |
| CN115872681A (en) * | 2022-12-26 | 2023-03-31 | 浙江龙游通衢建材有限公司 | Modified polypropylene fiber concrete and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140364535A1 (en) * | 2013-06-05 | 2014-12-11 | Halliburton Energy Services, Inc. | Methods and Cement Compositions Utilizing Treated Polyolefin Fibers |
| 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 |
-
2018
- 2018-08-08 CN CN201810897394.3A patent/CN110820066B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140364535A1 (en) * | 2013-06-05 | 2014-12-11 | Halliburton Energy Services, Inc. | Methods and Cement Compositions Utilizing Treated Polyolefin Fibers |
| 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 (3)
| Title |
|---|
| 刘鸿铭等: "表面亲水改性聚丙烯纤维的性能研究", 《化工时刊》 * |
| 曹玲玲等: "超细CaCO_3/PP复合纤维的制备和亲水行为研究", 《合成技术及应用》 * |
| 柯扬船等: "聚丙烯超短复合纤维的制备与性能", 《高分子材料科学与工程》 * |
Cited By (15)
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| 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 |
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| CN115029926A (en) * | 2022-07-13 | 2022-09-09 | 中国石油大学(华东) | Fiber grafted expandable resin plugging material composition, preparation method and application thereof in well cementation, leakage prevention and plugging |
| 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 |
| CN115418204A (en) * | 2022-09-22 | 2022-12-02 | 四川金江建材科技有限公司 | Plugging agent for oil field drilling fluid and preparation method thereof |
| 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 |
| CN115872681A (en) * | 2022-12-26 | 2023-03-31 | 浙江龙游通衢建材有限公司 | Modified polypropylene fiber concrete 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 |
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