CN116042191A - Composite plugging material and application thereof - Google Patents

Composite plugging material and application thereof Download PDF

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Publication number
CN116042191A
CN116042191A CN202211405286.2A CN202211405286A CN116042191A CN 116042191 A CN116042191 A CN 116042191A CN 202211405286 A CN202211405286 A CN 202211405286A CN 116042191 A CN116042191 A CN 116042191A
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fiber
plugging material
particles
fibers
composite plugging
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李强
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Sichuan Kangrong Petrochemical Technology Co ltd
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Sichuan Kangrong Petrochemical Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/08—Fiber-containing well treatment fluids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses a composite plugging material and application thereof, and relates to the technical field of oil and gas field drilling. Under the bridging action of the flexible and rigid composite fibers, specific flaky and granular filling particles are selected as bridging particles, and a shielding belt with strength and toughness can be formed with a drilling fluid solid phase during operation, so that an excellent blocking effect is shown under the action of pressure difference. Under the synergistic effect of the polymer film forming agent, the compactness and the viscoelasticity of the shielding belt are further improved, a brick mud alternating multilayer structure with a dot line and a surface combined is formed, and the problem of heterogeneous reservoir protection is solved. In addition, the method has small influence on the performances such as the flowing parameters of drilling fluid, solves the problem of plugging of large and small pore throats, can promote the formation of stable inner and outer compact mud cakes, reduces the invasion of solid and liquid, and realizes better protection effect on hydrocarbon reservoirs.

Description

Composite plugging material and application thereof
Technical Field
The invention relates to the technical field of oil and gas field drilling, in particular to a composite plugging material and application thereof, wherein C09K8/03 is adopted.
Background
Damage to the hydrocarbon reservoir can result in reduced productivity, sun Hang hydrocarbon resources, large estimated deviation of reserve production values, increased workload of oil testing, acidizing, fracturing well workover and the like, and increased operation cost. The drilling fluid is firstly contacted with the hydrocarbon reservoir, and damages to the reservoir mainly originate from solid phase blockage and filtrate invasion, so that factors such as key Guan Zhushui sensitivity, alkali sensitivity, salt sensitivity and the like improve the inhibition and blockage of the drilling fluid, reduce liquid phase invasion and can better protect the hydrocarbon reservoir. The reservoir rock Dan Wuxing of each layer has larger difference, the large throat and the small throat are difficult to consider, the reservoir damage factors are different, one layer is inevitably protected by a single protection technology to damage the other layer, and a better protection effect is difficult to achieve.
The Chinese patent application CN110872503B discloses a novel composite plugging agent for well drilling and application thereof, wherein the novel composite plugging agent comprises a particle bridging material, a particle filling material, flexible fibers and a flexible foam material, the obtained plugging agent can be suitable for cracks and holes with different width sizes, can form effective residence in a leakage channel, can form effective plugging after being compounded with particles, and has high bearing capacity of a plugging layer. Chinese patent application CN114672289A discloses a delayed expansion leakage-proof plugging working fluid for a crack leakage layer and a preparation method thereof, wherein the working fluid comprises base slurry, a delayed expansion plugging agent, rigid particles, elastic particles and fiber materials, has a delayed expansion effect, is easy to form a dense pressure-bearing plugging layer with a strong chain network structure, and improves pressure-bearing capacity and plugging performance. However, the plugging agent obtained by the technical scheme has poor compactness and viscoelasticity and can also cause certain liquid phase invasion.
Disclosure of Invention
In order to solve the above problems, the first aspect of the present invention provides a composite plugging material, which is prepared from the following raw materials: a bridging particulate fiber and a polymeric film former.
In some preferred embodiments, the mass ratio of the bridging particle fibers to the polymeric film former is (1.3 to 2.7): 1, a step of; preferably 2:1.
in some preferred embodiments, the raw materials for preparing the bridged particulate fibers include fibers and filler particles.
In some preferred embodiments, the mass ratio of filler particles to fibers is (1-10): 1, a step of; preferably (2 to 7): 1, a step of; further preferably 4:1.
in some preferred embodiments, the fibers are selected from at least one of flexible fibers, rigid fibers; flexible fibers and rigid fibers are preferred.
In some preferred embodiments, the mass ratio of flexible fibers to rigid fibers is (1.1-2.4): 1, a step of; preferably 1.5:1.
in some preferred embodiments, the flexible fibers are selected from at least one of asbestos wool, sepiolite wool, plant fibers; sepiolite wool and vegetable fibers are preferred.
In some preferred embodiments, the mass ratio of sepiolite wool to plant fiber is 1: (1-1.6); preferably 1:1.2.
in some preferred embodiments, the sepiolite wool has a flexural strength of 8 to 15MPa and a compressive strength of 400 to 600MPa; preferably, the flexural strength is 12MPa and the compressive strength is 500MPa.
In some preferred embodiments, the plant fiber is a chopped plant fiber that is free of gum and lignin to prevent foaming of the drilling fluid during drilling, thereby avoiding causing blowout accidents.
Preferably, the plant fiber is at least one selected from walnut shell, coconut shell powder, cotton seed shell, rice hull, corn stalk and wood dust; preferably wood chips.
In some preferred embodiments, the wood chips have an average length of 0.02 to 1.5m; preferably 0.8mm.
In some preferred embodiments, the wood chips of a particular particle size in the present application are obtained by pulverizing existing wood chips.
In some preferred embodiments, the rigid fibers are selected from at least one of silicate clay mineral fibers, magnesium-rich silicate mineral fibers, polyacrylonitrile fibers, polylactic acid fibers, copper fibers, carbon fibers, polyurethane fibers, aromatic polyamide fibers, polyethylene terephthalate fibers; polylactic acid fibers and polyurethane fibers are preferred.
In some preferred embodiments, the polylactic acid fiber and the polyurethane fiber are prepared by respectively using conventional electrospinning of polylactic acid and polyurethane with specific properties.
In some preferred embodiments, the polylactic acid has a melt index of 10 to 30g/10min at 190℃and a tensile strength of 40 to 55MPa at 2.16 kg; preferably, the melt index at 190℃and 2.16kg is 18g/10min and the tensile strength is 45MPa.
In some preferred embodiments, the polylactic acid fibers have a fiber fineness in the range of 10 to 45 μm and a fiber length of 1.0 to 3.0mm; preferably, the fiber fineness is in the range of 12 to 17 μm and the fiber length is 1.8mm.
In some preferred embodiments, the polyurethane has a tensile strength at break of 50 to 70MPa and a tensile strength at yield of 45 to 65MPa; preferably, the tensile strength at break is 60MPa and the tensile strength at yield is 60MPa.
In some preferred embodiments, the polyurethane fibers have a fiber titer in the range of 5 to 35 μm and a fiber length of 1.5 to 4.5mm; preferably, the fiber fineness ranges from 16 to 20 μm and the fiber length is 1.8mm.
In some preferred embodiments, the polylactic acid fiber and polyurethane fiber have a mass ratio of 1: (1-1.7); preferably 1:1.3.
the flexible fiber is added to form a net-shaped framework in the plugging process, so that the particle particles are well connected, the plugging effect of the material is increased, but the strength is poor, the material is easy to soften after meeting stratum water, the temperature resistance and the alkali resistance are poor, and more importantly, the bridging effect is not obvious. In this application, mix flexible fiber and rigid fiber, can further consolidate netted skeleton, play fine bridging effect, increase the intensity of material simultaneously, especially select polylactic acid fiber and polyurethane fiber of specific length, do benefit to more filler particles evenly dispersion in three-dimensional system, go deep into polylactic acid, near the unsaturated bond of polyurethane molecular chain and take place with electron cloud and act on, and then increase the high temperature of material, chemical stability and toughness, further increase composite plugging material's intensity, polylactic acid can be in the stratum natural degradation simultaneously, can realize the guard action to the hydrocarbon reservoir.
In some preferred embodiments, the filler particles are selected from at least one of particulate, fibrous, and platelet; preferably a combination of tablet and granule form.
In some preferred embodiments, the mass ratio of the flaky filler particles to the granular filler particles is (1 to 4): 1, a step of; preferably 2.5:1.
in some preferred embodiments, the flake filler particles are selected from at least one of mica flakes, vermiculite, shell, graphite, glass flakes; preferably mica flakes.
In some preferred embodiments, the mica flakes have a particle size of 10 to 200 mesh and a bulk density of 0.1 to 0.5g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Preferably, the particle size is 10 to 100 meshes, 0.25 to 0.4g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Further preferably, the particle size is 10 to 20 mesh and the bulk density is 0.38g/cm 3 。
In some preferred embodiments, the particulate filler particles are selected from at least one of coke particles, diatomaceous earth, calcite, marble, cotton seed hulls, dolomite powder, vermiculite, elastic graphite, elastic rubber; preferably a combination of dolomite powder, vermiculite and resilient graphite particles.
In some preferred embodiments, the dolomite powder has a particle size in the range of 1000 to 3000 mesh; preferably 1250 to 2500 mesh.
In some preferred embodiments, the vermiculite has a particle size in the range of 5 to 325 mesh, a SiO2 content of 30 to 42wt% and an Al2O3 content of 12 to 23wt%; preferably, the grain diameter ranges from 5 to 150 meshes, the SiO2 content ranges from 34 to 39 weight percent, and the Al2O3 content ranges from 15 to 20 weight percent; further preferably, the particle size is in the range of 5 to 15 mesh, the SiO2 content is 35wt%, and the Al2O3 content is 18wt%.
In some preferred embodiments, the elastic rubber particles are selected from at least one of NBR (nitrile rubber), BR (polybutadiene rubber), CSM (chlorosulfonated polyethylene), PEI (polyetherimide), polysulfide rubber.
In some preferred embodiments, the elastic graphite particles have a particle size ranging from 10 to 200 mesh, a rebound > 25% and a specific gravity of 1.40g/mL or more; preferably, the particle size is in the range of 20-80 mesh, the rebound rate is more than 50%, and the specific gravity is more than or equal to 1.58g/mL.
In some preferred embodiments, the dolomite powder, vermiculite and elastic graphite particles have a mass ratio of 1: (1.1-1.7): (0.8-1.5); preferably 1:1.3:1.2.
the addition of the granular filling particles can be supplemented at the pores of the flaky filling particles, so that the strength and the plugging performance of the bridging granular fibers are improved. The applicant finds that when the granular filling particles are added with the elastic graphite particles on the basis of dolomite powder and vermiculite, the strength of the composite plugging material can be increased, the pressure-bearing performance of the material can be improved, and the sedimentation performance of drilling fluid can be reduced. Presumably, the elastic graphite has low density, good compatibility with a system, good crushing resistance, high compression, deformation and recovery after pressure removal, so that the crack is blocked, leakage is prevented, and sedimentation of drilling fluid is reduced. Particularly, elastic fiber with the granularity range of 10-200 meshes, the rebound rate of more than 25 percent and the specific gravity of more than or equal to 1.40g/mL is selected, the elastic fiber has strong adsorption capacity to the well wall, has certain lubricating property, is easier to move and fill into cracks under the action of pressure difference, and when the rebound rate of more than 50 percent, the mass ratio of dolomite powder, vermiculite and elastic graphite particles is 1: (1.1-1.7): (0.8-1.5), the elastic graphite with the deformation degree and other components are cooperated, so that the formation strength can be increased, the pressure for cracking the bottom layer is increased, the gaps with different sizes are simultaneously met for plugging, and the plugging material can be prevented from sliding to the deep part of the crack or from spitting back due to the breathing effect of the formation.
In some preferred embodiments, the polymeric film former is prepared by: taking wood pulp and starch as raw materials, alkalizing and fibrillating the wood pulp, and then etherifying and carboxylating to obtain a component A; crosslinking, grafting and etherifying starch, and introducing sulfoethyl to obtain a component B; and finally, mixing the component A, the component B and polyvinylpyrrolidone.
Preferably, the preparation method of the polymer film forming agent comprises the following steps:
s1, dissolving wood pulp in an alkali solution for swelling for 2-3 hours, adding halogenated acid, heating to 60-75 ℃ for reaction for 1-4 hours, then adding halogenated acid salt for reaction for 1-3 hours, and standing to obtain a component A;
s2, mixing gelatinized starch with a polymer monomer for 30-40 min, adding an initiator to perform grafting reaction under the action of nitrogen for 2-4 h to form a grafted polymer, then adding sodium sulfosuccinate to react for 1-3 h, and finally adding halogenated acid to react and heating to 60-75 ℃ to react for 1-3.5 h to obtain a component B;
s3, mixing the component A and the component B, adding an auxiliary agent, and stirring to obtain the adhesive.
In some preferred embodiments, the alkali in the alkali solution in S1 is at least one selected from sodium hydroxide, potassium hydroxide, barium hydroxide, ammonium hydroxide, and hydroxide calcium hydroxide; sodium hydroxide is preferred.
In some preferred embodiments, the solvent of the alkaline solution in S1 is selected from at least one of water, ethanol, isopropanol, toluene; water and isopropanol are preferred.
In some preferred embodiments, the volume ratio of water to isopropyl alcohol is 1: (1.5-3); preferably 1:2.4.
in some preferred embodiments, the ratio of the mass of wood pulp to the volume of the alkaline solution in S1 is 1: (9-13); preferably 1:10.5.
in some preferred embodiments, the mass ratio of wood pulp to halogenated acid in S1 is 1: (0.7-2); preferably 1:0.9.
in some preferred embodiments, the haloacid salt in S1 is selected from at least one of sodium monochloroacetate, sodium dichloroacetate, sodium trichloroacetate; preferably sodium monochloroacetate; further preferred is an ethanol solution of sodium monochloroacetate.
In some preferred embodiments, the mass percentage of sodium monochloroacetate in the ethanol solution of sodium monochloroacetate is 40-55%; preferably 50%.
In some preferred embodiments, the starch in S2 is at least one selected from corn starch, wheat starch, potato starch, sweet potato starch; preferably potato starch.
In some preferred embodiments, the polymer monomer contains hydroxyl, preferably at least one of acrylonitrile, acrylamide, acrylic acid, and acrylic acid ester; acrylamide is preferred.
In some preferred embodiments, the mass ratio of gelatinized starch to polymer monomer in S2 is 1: (0.2-1); preferably 1:0.5.
in some preferred embodiments, the initiator is selected from at least one of potassium persulfate, ammonium cerium nitrate, ammonium cerium sulfate, urea thio, hydrogen peroxide, potassium permanganate; cerium nitrate is preferred.
In some preferred embodiments, the initiator comprises 0.05 to 1.0wt% of the monomer; preferably 0.3%.
In some preferred embodiments, the mass ratio of gelatinized starch to sodium sulfosuccinate in S2 is 1: (0.75-0.85): preferably 1:0.8.
in some preferred embodiments, the halogenated acid in S1 and S2 is selected from at least one of monochloroacetic acid, dichloroacetic acid, trichloroacetic acid; preferably monochloroacetic acid; more preferably an ethanol solution of monochloroacetic acid.
In some preferred embodiments, the mass percentage of monochloroacetic acid in the ethanol solution of monochloroacetic acid is 50-60%; preferably 55%.
In some preferred embodiments, the halogenated acid in S1 and S2 is added multiple times; preferably 2 to 5 times; further preferably 3 times.
In some preferred embodiments, the mass ratio of the component A, the component B and the polyvinylpyrrolidone in the S3 is (4-5): (3.5-4.5): 1, a step of; preferably 4.7:4.1:1.
under the bridging action of the flexible and rigid composite fibers, specific flaky and granular filling particles are selected as bridging particles, and a shielding belt with strength and toughness can be formed with a drilling fluid solid phase during operation, so that an excellent blocking effect is shown under the action of pressure difference. But it cannot further prevent invasion of the solid and liquid phases. Therefore, the polymer film forming agent added into wood pulp and starch as raw materials can carry out the re-sealing and blocking of the formed shielding belt, particularly, sulfoethyl is introduced after acrylamide modified starch is selected, the film forming agent is formed by the treated wood pulp under the action of polyvinylpyrrolidone, the film forming performance is good, meanwhile, the film forming efficiency is excellent, active groups contained in the grafted polymer can be compatible and adsorbed with a plurality of substances to form hydrogen bonds and form 'bridging' between adsorbed ions, the strong adsorption is realized, the compactness and the viscoelasticity of the shielding belt are further improved on the basis of high-efficiency wind intensity, the diameter of a pore throat of a reservoir layer is not required to be accurately known, and further invasion of solid and liquid is prevented.
The second aspect of the invention provides application of the composite plugging material in oil and gas layer protection.
Compared with the prior art, the invention has the following beneficial effects:
(1) Under the bridging action of the flexible and rigid composite fibers, specific flaky and granular filling particles are selected as bridging particles, and a shielding belt with strength and toughness can be formed with a drilling fluid solid phase during operation, so that an excellent blocking effect is shown under the action of pressure difference. Under the synergistic effect of the polymer film forming agent, the compactness and the viscoelasticity of the shielding belt are further improved, a brick mud alternating multilayer structure with a dot line and a surface combined is formed, and the problem of heterogeneous reservoir protection is solved.
(2) According to the invention, by reasonably matching filling particles, fibers and polymer film forming agents with different particle diameters, the obtained composite plugging material has high strength, good pressure bearing performance and small influence on the performances such as the flow parameters of drilling fluid, solves the plugging problem of large and small pore throats, can promote the formation of stable inner and outer compact mud cakes, reduces the invasion of solid and liquid, and realizes better protection effect on hydrocarbon reservoirs.
Detailed Description
Example 1
1. A composite plugging material is prepared from the following raw materials: a bridging particulate fiber and a polymeric film former.
The mass ratio of the bridging particle fiber to the polymer film forming agent is 2:1.
the preparation raw materials of the bridging particle fiber comprise fibers and filling particles.
The mass ratio of the filling particles to the fibers is 4:1.
the fibers are flexible fibers and rigid fibers.
The mass ratio of the flexible fiber to the rigid fiber is 1.5:1.
the flexible fiber is sepiolite velvet and plant fiber.
The mass ratio of the sepiolite velvet to the plant fiber is 1:1.2.
the sepiolite wool has a flexural strength of 12MPa and a compressive strength of 500MPa (Hebei Heng Ming Co., ltd.).
The plant fiber is a chopped plant fiber which does not contain colloid and lignin. The plant fiber is wood dust.
The average length of the wood chips was 0.8mm.
The wood chips having a specific particle size in the present application are obtained by pulverizing existing wood chips.
The rigid fibers are polylactic acid fibers and polyurethane fibers.
The polylactic acid fiber and the polyurethane fiber are prepared by respectively utilizing the polylactic acid with specific properties and the polyurethane with conventional electrostatic spinning.
The melt index of the polylactic acid at 190 ℃ and 2.16kg is 18g/10min, and the tensile strength is 45MPa (Anhuifeng Probiotics Co., ltd., FY 404).
The fiber fineness of the polylactic acid fiber ranges from 12 to 17 mu m, and the fiber length is 1.8mm.
The polyurethane had a tensile strength at break of 60MPa and a tensile strength at yield of 60MPa (Korschun, TPU DP 9380A).
The fiber fineness of the polyurethane fiber ranges from 16 mu m to 20 mu m, and the fiber length is 1.8mm.
The mass ratio of the polylactic acid fiber to the polyurethane fiber is 1:1.3.
the filler particles are a combination of flakes and particles.
The mass ratio of the flaky filling particles to the granular filling particles is 2.5:1.
the flaky filler particles are mica flakes.
The granularity of the mica sheet is 10-20 meshes, and the loose density is 0.38g/cm 3 (processing plant of the Jiayuan mineral product of the Mingzhou county).
The granular filling particles are the combination of dolomite powder, vermiculite and elastic graphite grains.
The particle size of the dolomite powder ranges from 1250 to 2500 meshes (the mineral products sales limited company of the Ministry of life and county).
The grain size of the vermiculite is 5-15 meshes, the SiO2 content is 35wt%, and the Al2O3 content is 18wt% (Shijia Ruichang agricultural technology Co., ltd.).
The granularity range of the elastic graphite particles is 20-80 meshes, the rebound rate is more than 50%, and the specific gravity is more than or equal to 1.58g/mL (TXT-500 of Qingdao rock-sea carbon materials Co., ltd.).
The mass ratio of dolomite powder, vermiculite and elastic graphite particles is 1:1.3:1.2.
the preparation method of the polymer film forming agent comprises the following steps:
s1, dissolving wood pulp in an alkali solution for swelling for 2.5 hours, adding halogenated acid, heating to 70 ℃ for reaction for 3 hours, adding halogenated acid salt for reaction for 2 hours, and standing to obtain a component A;
s2, mixing gelatinized starch with a polymer monomer for 35min, adding an initiator to perform a grafting reaction under the action of nitrogen for 3h to form a grafted polymer, then adding sodium sulfosuccinate to react for 2h, and finally adding halogenated acid to react and heating to 70 ℃ to react for 2.5h to obtain a component B;
s3, mixing the component A and the component B, adding polyvinylpyrrolidone, and stirring to obtain the modified polyvinyl pyrrolidone.
The alkali in the alkali solution in the step S1 is sodium hydroxide.
The solvent of the alkaline solution in the S1 is water and isopropanol.
The volume ratio of the water to the isopropanol is 1:2.4.
the volume ratio of the mass of the wood pulp to the alkaline solution in the S1 is 1:10.5.
in the S1, the mass ratio of wood pulp to halogenated acid is 1:0.9.
the halogenated acid salt in the S1 is ethanol solution of sodium monochloroacetate.
The mass percentage of the sodium monochloroacetate in the ethanol solution of the sodium monochloroacetate is 50%.
The starch in the step S2 is potato starch.
The polymer monomer contains hydroxyl and is acrylamide.
The mass ratio of the gelatinized starch to the polymer monomer in the S2 is 1:0.5.
the initiator is cerium nitrate.
The initiator comprises 0.3% of the monomer.
The mass ratio of the gelatinized starch to the sodium sulfosuccinate in the S2 is 1:0.8.
the halogenated acid in S1 and S2 is ethanol solution of monochloroacetic acid.
The mass percentage of the monochloroacetic acid in the monochloroacetic acid ethanol solution is 55 percent.
The halogenated acid in S1 and S2 is added for a plurality of times, specifically 3 times.
In the S3, the mass ratio of the component A to the component B to the polyvinylpyrrolidone is 4.7:4.1:1.
2. an application of a composite plugging material in the protection of hydrocarbon reservoirs.
Example 2
1. A composite plugging material differing from example 1 in that:
the mass ratio of the bridging particle fiber to the polymer film forming agent is 1.7:1.
2. an application of a composite plugging material in the protection of hydrocarbon reservoirs.
Example 3
1. A composite plugging material differing from example 1 in that:
the mass ratio of the polylactic acid fiber to the polyurethane fiber is 1:2.5.
2. an application of a composite plugging material in the protection of hydrocarbon reservoirs.
Example 4
1. A composite plugging material differing from example 1 in that:
the mass ratio of the flaky filling particles to the granular filling particles is 0.5:1.
2. an application of a composite plugging material in the protection of hydrocarbon reservoirs.
Example 5
1. A composite plugging material differing from example 1 in that:
the granular filling particles are the combination of dolomite powder and elastic graphite particles; the mass ratio is 1:1.2.
2. an application of a composite plugging material in the protection of hydrocarbon reservoirs.
Example 6
1. A composite plugging material differing from example 1 in that:
the preparation raw material is bridging particle fiber.
2. An application of a composite plugging material in the protection of hydrocarbon reservoirs.
Performance testing
The supramolecular composite plugging materials obtained in examples 1-6 were tested as follows. The specific test results are shown in Table 1.
1. Blocking property: the drilling fluid plugging property comparison before and after adding the supermolecule composite plugging materials obtained in examples 1-6 in the oil and gas layer is carried out indoors by using a PPA plugging tester, a test medium is a 5D ceramic disc, the test temperature is set to 80 ℃, the pressure is 7MPa, and the leakage (unit: mL) is recorded.
2. Core permeability recovery value evaluation: jidong outcrop core (87 # core in examples 1-5 and 112# core in example 6) is selected, 80 ℃ is set as a test temperature, and the change of the permeability recovery value of the drilling fluid core before and after the addition of the supermolecule composite plugging material obtained in examples 1-6 is measured.
Table 1 test results of the composite plugging materials obtained in the examples
Figure BDA0003936488090000101
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Claims (10)

1. The composite plugging material is characterized by comprising the following preparation raw materials: a bridging particulate fiber and a polymeric film former;
the mass ratio of the bridging particle fiber to the polymer film forming agent is (1.3-2.7): 1.
2. the composite plugging material according to claim 1, wherein the raw materials for preparing the bridging particle fibers comprise fibers and filler particles;
the mass ratio of the filling particles to the fibers is (1-10): 1.
3. the composite plugging material according to claim 2, wherein said fibers are selected from at least one of flexible fibers, rigid fibers;
the flexible fiber is at least one selected from asbestos wool, sepiolite wool and plant fiber;
the rigid fiber is at least one selected from silicate clay mineral fiber, magnesium-rich silicate mineral fiber, polyacrylonitrile fiber, polylactic acid fiber, copper fiber, carbon fiber, polyurethane fiber, aromatic polyamide fiber and polyethylene terephthalate fiber.
4. A composite plugging material according to claim 2 or 3, wherein said filler particles are selected from at least one of particulate, fibrous, and platelet.
5. The composite plugging material of claim 4, wherein said filler particles are a combination of flakes and particles;
the mass ratio of the flaky filler particles to the granular filler particles is (1-4): 1.
6. the composite plugging material according to claim 5, wherein said flaky filler particles are at least one selected from the group consisting of mica flakes, vermiculite, shell, graphite, and glass flakes.
7. The composite plugging material according to claim 6, wherein said granular filler particles are selected from at least one of coke particles, diatomaceous earth, calcite, marble, cotton seed hulls, dolomite powder, vermiculite, elastic graphite, and elastic rubber.
8. The composite plugging material of claim 7, wherein said particulate filler particles are a combination of dolomite powder, vermiculite and resilient graphite particles;
the mass ratio of dolomite powder, vermiculite and elastic graphite particles is 1: (1.1-1.7): (0.8-1.5).
9. The composite plugging material according to claim 1 or 8, wherein the preparation method of the polymer film forming agent comprises the following steps: taking wood pulp and starch as raw materials, alkalizing and fibrillating the wood pulp, and then etherifying and carboxylating to obtain a component A; crosslinking, grafting and etherifying starch, and introducing sulfoethyl to obtain a component B; and finally, mixing the component A, the component B and polyvinylpyrrolidone.
10. Use of a composite plugging material according to any one of claims 1-9 in hydrocarbon reservoir protection.
CN202211405286.2A 2022-11-10 2022-11-10 Composite plugging material and application thereof Pending CN116042191A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793505A (en) * 2005-12-30 2006-06-28 湖北达雅化工技术发展有限公司 Water-retaining agent for coating of coated paper and preparation method thereof
CN101314920A (en) * 2008-05-12 2008-12-03 湖北达雅化工技术发展有限公司 Complex printing gum for reactive dye and preparation method thereof
CN110776888A (en) * 2018-07-30 2020-02-11 中国石油化工股份有限公司 Composite water-soluble temporary plugging agent for oilfield turning fracturing construction
CN110872502A (en) * 2018-09-04 2020-03-10 中石化石油工程技术服务有限公司 Composite plugging agent for well drilling and application thereof
CN110872503A (en) * 2018-09-04 2020-03-10 中石化石油工程技术服务有限公司 Novel composite plugging agent for well drilling and application thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793505A (en) * 2005-12-30 2006-06-28 湖北达雅化工技术发展有限公司 Water-retaining agent for coating of coated paper and preparation method thereof
CN101314920A (en) * 2008-05-12 2008-12-03 湖北达雅化工技术发展有限公司 Complex printing gum for reactive dye and preparation method thereof
CN110776888A (en) * 2018-07-30 2020-02-11 中国石油化工股份有限公司 Composite water-soluble temporary plugging agent for oilfield turning fracturing construction
CN110872502A (en) * 2018-09-04 2020-03-10 中石化石油工程技术服务有限公司 Composite plugging agent for well drilling and application thereof
CN110872503A (en) * 2018-09-04 2020-03-10 中石化石油工程技术服务有限公司 Novel composite plugging agent for well drilling and application thereof

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