CN116217791A - Water-based polymer nano microsphere high-temperature-resistant filtrate reducer and preparation method and application thereof - Google Patents
Water-based polymer nano microsphere high-temperature-resistant filtrate reducer and preparation method and application thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229920000642 polymer Polymers 0.000 title claims abstract description 89
- 239000000706 filtrate Substances 0.000 title claims abstract description 81
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 74
- 239000004005 microsphere Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 49
- 239000002002 slurry Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 239000000178 monomer Substances 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 26
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 26
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 22
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 22
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 22
- 239000003999 initiator Substances 0.000 claims abstract description 20
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000002105 nanoparticle Substances 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 28
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 24
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 15
- 239000000839 emulsion Substances 0.000 claims description 14
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 13
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000007908 nanoemulsion Substances 0.000 claims description 10
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 9
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- LXEKPEMOWBOYRF-UHFFFAOYSA-N [2-[(1-azaniumyl-1-imino-2-methylpropan-2-yl)diazenyl]-2-methylpropanimidoyl]azanium;dichloride Chemical group Cl.Cl.NC(=N)C(C)(C)N=NC(C)(C)C(N)=N LXEKPEMOWBOYRF-UHFFFAOYSA-N 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims 3
- 239000003054 catalyst Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000006116 polymerization reaction Methods 0.000 abstract description 10
- 239000007864 aqueous solution Substances 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 4
- 125000000623 heterocyclic group Chemical group 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000004927 clay Substances 0.000 description 25
- 230000032683 aging Effects 0.000 description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000012071 phase Substances 0.000 description 10
- 239000012065 filter cake Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- 239000012153 distilled water Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 238000004220 aggregation Methods 0.000 description 5
- 230000002776 aggregation Effects 0.000 description 5
- 239000008346 aqueous phase Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 4
- 239000004971 Cross linker Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- -1 sulfomethyl Chemical group 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000012688 inverse emulsion polymerization Methods 0.000 description 2
- 239000003077 lignite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004530 micro-emulsion Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000002077 nanosphere Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000010557 suspension polymerization reaction Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
- C08F2/08—Organic solvent with the aid of dispersing agents for the polymer
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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
- C09K8/035—Organic additives
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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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a water-based polymer nano microsphere high-temperature-resistant filtrate reducer, a preparation method and application thereof, wherein the water-based polymer nano microsphere high-temperature-resistant filtrate reducer is prepared by reacting the following substances in percentage by weight: 28.0 to 39.0 percent of reaction monomer, 16.0 to 20.0 percent of polyethylene glycol, 1.0 to 2.0 percent of sodium hexametaphosphate, 0.005 to 0.010 percent of cross-linking agent, 0.020 to 0.040 percent of initiator and the balance of water. The polymer nano microsphere is obtained by forming a homogeneous system in an aqueous solution with polyethylene glycol as a dispersing agent for polymerization, contains heterocycle, is favorable for improving the temperature resistance of the filtrate reducer, and has smaller particle size and good water absorption expansion performance. The high-temperature filtrate reducer slurry system with the water-based polymer nano-microspheres is added under high temperature and high pressure, the nano-microspheres are gradually swelled and deformed by water absorption, so that the high-permeability pore canal of a mud cake can be plugged, and the filtrate loss of drilling fluid is reduced.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploration, development and drilling production, and particularly relates to a water-based polymer nano microsphere high-temperature-resistant filtrate reducer, a preparation method and application thereof.
Background
With the continuous advancement of oil and gas exploration and development to the deep and high-pressure stratum fields, the requirements of high-temperature and high-pressure deep well drilling on the performance of drilling fluid are continuously improved, and the conventional drilling fluid treating agent is difficult to meet the severe requirements of deep wells on the rheological property and fluid loss wall-building performance of the drilling fluid in the aspects of physical, chemical and thermodynamic properties.
The key of the high-temperature-resistant drilling fluid is a high-temperature-resistant drilling fluid treating agent, in particular a filtrate reducer with stable performance under high temperature conditions. Currently, most commonly used drilling fluid filtrate reducers are natural or synthetic polymers with large relative molecular weight, such as: sulfonated modified products such as sulfomethyl lignite, sulfomethyl phenolic resin, sulfonated lignite resin, and sulfomethyl phenolic resin lignin, and polymer filtrate reducers prepared from monomers such as vinyl sulfonic acid monomers, acrylamide, alkylacrylamide, and N-vinyl-N-alkylamide. The filtrate reducer can reduce the filtrate loss of drilling fluid, and simultaneously can improve the viscosity of the drilling fluid to different degrees to cause the problems of high Wen Zengnian and pollution and viscosity increase. In the use process of some filtrate reducers with small relative molecular weight, the use amount is larger and larger although the field requirement is met, and the filtrate reducers can exert the due effect only by being compounded with other products, so that the input cost is gradually increased. Although there are filtrate reducers specially aiming at high temperature or ultra-high temperature abroad, the cost is high, and a large amount of application is difficult to put into domestic use.
The invention discloses a filtrate reducer for a temperature-resistant and brine-resistant drilling fluid, which is disclosed by the national intellectual property agency and has the publication number of CN113150754A, and the filtrate reducer for the temperature-resistant and brine-resistant drilling fluid and a preparation method thereof adopts raw materials of acrylamide, N-vinyl pyrrolidone, 2-acrylamide-dimethyl propane sulfonic acid and a zwitterionic monomer to be copolymerized under the action of an initiator to generate a quaternary block polymer.
Disclosure of Invention
The invention aims to provide a water-based polymer nano microsphere high-temperature-resistant filtrate reducer, which overcomes the technical problems in the prior art.
The invention also aims to provide a preparation method of the water-based polymer nanoparticle anti-high temperature filtrate reducer, which comprises the steps of dissolving a reaction monomer, an initiator and a crosslinking agent in an aqueous solution taking polyethylene glycol as a dispersing agent to form a homogeneous system for polymerization, and separating out the polymer to form a dispersed phase of the polymer nanoparticle when the molecular weight of the polymer is greater than the critical phase molecular weight along with the polymerization reaction, and suspending the dispersed phase in the aqueous phase taking the polyethylene glycol as the dispersing agent to form the water-based polymer nanoparticle emulsion.
The invention also aims to provide an application of the water-based polymer nano microsphere high-temperature-resistant filtrate reducer, which can be directly and singly used as the filtrate reducer in the drilling fluid of the high-temperature high-pressure oil-gas well and also used in combination.
Therefore, the technical scheme provided by the invention is as follows:
the water-based polymer nano microsphere high-temperature-resistant filtrate reducer is prepared by reacting the following substances in percentage by weight: 28.0 to 39.0 percent of reaction monomer, 16.0 to 20.0 percent of polyethylene glycol, 1.0 to 2.0 percent of sodium hexametaphosphate, 0.005 to 0.010 percent of cross-linking agent, 0.020 to 0.040 percent of initiator and the balance of water.
The reaction monomer comprises the following substances in percentage by weight: 20.0 to 25.0 percent of acrylamide, 6.0 to 10.0 percent of 2-acrylamido-2-methylpropanesulfonic acid and 2.0 to 4.0 percent of N-vinyl pyrrolidone.
The cross-linking agent is N, N-methylene bisacrylamide, and the initiator is 2,2' -azo diisobutyl amidine dihydrochloride.
The preparation method of the water-based polymer nano microsphere high-temperature-resistant filtrate reducer comprises the following steps:
step 1) uniformly mixing a formula amount of reaction monomer, a crosslinking agent and a proper amount of water, adjusting the pH value to 7.0, introducing nitrogen and deoxidizing to obtain a reaction monomer mixed solution;
step 2) stirring and mixing the sodium hexametaphosphate, polyethylene glycol and the residual water according to the formula amount, introducing nitrogen and deoxidizing to obtain a stable dispersing agent solution;
step 3) adding the reaction monomer mixed solution into the stable dispersing agent solution under the stirring action, heating to 50-60 ℃ under the protection of nitrogen after uniformly stirring, then dropwise adding the initiator solution, and reacting for 1-2h at 50-60 ℃ after dripping, thus obtaining the water-based polymer nano microsphere emulsion which is the water-based polymer nano microsphere high temperature resistant filtrate reducer.
An application of water-based polymer nano microsphere high-temperature-resistant filtrate reducer in oil and gas well drilling fluid.
When the filtrate reducer is used independently, the dosage is 3.0-6.0% of the volume percentage of the slurry.
The filtrate reducer and water-based SiO 2 When the nano emulsion is compounded and used, the mass percent of the filtrate reducer is 50.0-70.0%, and the mass percent of the water-based SiO is the same as that of the filtrate reducer 2 The mass percentage of the nano emulsion is 30.0-50.0%.
The SiO is 2 The particle size of the nano particles is 20 nm-200 nm.
The beneficial effects of the invention are as follows:
the water-based polymer nano microsphere high-temperature-resistant filtrate reducer is prepared by dissolving a reaction monomer, an initiator and a cross-linking agent in an aqueous solution taking polyethylene glycol as a dispersing agent to form a homogeneous system for polymerization, and the polymer nano microsphere contains heterocycle, so that the temperature resistance of the filtrate reducer is improved.
The water-based polymer nano microsphere high-temperature filtrate reducer has the advantages of small nano microsphere particle size (the median particle size is 50-200 nm), and good water absorption expansion performance (the water absorption expansion multiplying power is 100-300). Under high temperature and high pressure, the water-based polymer nano microsphere high temperature filtrate reducer slurry system is added, and the organic polymer nano microsphere gradually absorbs water to expand and deform, so that the high-permeability pore canal of the mud cake can be plugged, and the filtrate loss of drilling fluid is reduced.
The invention is to dissolve the reaction monomer, initiator and cross-linking agent in the aqueous solution using polyethylene glycol as dispersing agent to form a homogeneous system for polymerization. Along with the progress of the polymerization reaction, when the molecular weight of the polymer is larger than the molecular weight of the critical phase, the polymer is separated out to form a dispersed phase of the nano polymer microsphere and is suspended in an aqueous phase taking polyethylene glycol as a dispersing agent to form the water-based polymer nano microsphere emulsion. Compared with the inverse suspension polymerization and inverse emulsion polymerization methods, the preparation method of the polymer microsphere has the characteristics of simple synthesis process operation, fast reaction heat transfer, stable system, low polymerization system viscosity, environmental friendliness and the like.
The water-based polymer nano microsphere and SiO of the invention 2 When the nano emulsion is compounded and used together, inorganic SiO 2 The nano particles provide a huge quantity of nucleation center particles, so that clay particles in drilling fluid are aggregated and grown around the huge quantity of nucleation particles, the clay particles are not aggregated and grown too much, and the filling and blocking of micro-gaps and micro-pores of a rock wall are realized through the permeation and bridging effects of micro-nano particles.
Further details will be described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a graph showing the initial particle size test results of the nanoparticle of PAAN-1 of example 1;
FIG. 2 is a graph showing the results of the particle size measurement after swelling of the nanomicrospheres in PAAN-1 of example 1;
FIG. 3 is a graph of clay particle size distribution prior to slurry aging;
FIG. 4 is a graph showing clay particle size distribution after aging of the base slurry;
FIG. 5 is a graph showing clay particle size distribution prior to aging with PAAN-1 mud;
FIG. 6 is a graph showing clay particle size distribution after aging with PAAN-1 mud;
FIG. 7 is a clay particle aggregation state after aging of the base slurry;
FIG. 8 is a graph showing clay particle aggregation after aging with PAAN-1 mud;
FIG. 9 is a scanning electron microscope image (5000 times) of the filter cake surface after high temperature aging of the base slurry;
FIG. 10 is a scanning electron microscope image (5000 times) of the filter cake after high temperature aging with PAAN-1 mud.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments is not intended to be limiting of the invention.
The invention provides a water-based polymer nano microsphere high-temperature resistant filtrate reducer, which is prepared by reacting the following substances in percentage by weight: 28.0 to 39.0 percent of reaction monomer, 16.0 to 20.0 percent of polyethylene glycol, 1.0 to 2.0 percent of sodium hexametaphosphate, 0.005 to 0.010 percent of cross-linking agent, 0.020 to 0.040 percent of initiator and the balance of water.
The reaction monomer comprises the following substances in percentage by weight: 20.0 to 25.0 percent of acrylamide, 6.0 to 10.0 percent of 2-acrylamido-2-methylpropanesulfonic acid and 2.0 to 4.0 percent of N-vinyl pyrrolidone.
The cross-linking agent is N, N-methylene bisacrylamide, and the initiator is 2,2' -azo diisobutyl amidine dihydrochloride.
Example 1:
the embodiment provides a water-based polymer nanoparticle high temperature resistant filtrate reducer, which is prepared by taking 100g of polymer nanoparticle as an example and is prepared by reacting the following substances in mass: 23.0g of Acrylamide (AM), 8.0g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and 3.0. 3.0g N-vinylpyrrolidone (NVP), 18.0g of polyethylene glycol, 1.5g of sodium hexametaphosphate, 0.008g of crosslinking agent, 0.025 g of initiator and the balance of water.
In this example, the weight percent of the reactive monomer was 34.0%, the weight percent of polyethylene glycol was 18.0%, the weight percent of sodium hexametaphosphate was 1.5%, the weight percent of the crosslinker was 0.008%, and the weight percent of the initiator was 0.025%.
The principle of the invention is as follows:
the water-based polymer nano microsphere has smaller particle size (the median particle size is between 50nm and 200 nm), good elasticity, small influence on the viscosity of the drilling fluid in the drilling fluid, and extremely easy deformation due to water absorption at high temperature, and a relatively compact network structure film is formed on the surface of a filter cake through embedding, covering and crosslinking, so that the filtration loss of slurry at high temperature is effectively reduced. Wherein, the polyethylene glycol can lead the clay particles to be dispersed stably and prevent the clay particles from gathering; the sodium hexametaphosphate plays a role in dispersing, and can be used together with polyethylene glycol to better stabilize the generated double-aqueous phase polymer microsphere emulsion. However, the dispersing effect is not obvious when the aqueous double-phase polymer microsphere emulsion is singly used, and the aqueous double-phase polymer microsphere emulsion can be demulsified when the aqueous double-phase polymer microsphere emulsion is combined with polyethylene glycol.
The preparation process comprises the following steps:
step 1) weighing 1.5g of sodium hexametaphosphate, placing the sodium hexametaphosphate into a four-neck flask, adding 16.0g of distilled water under stirring, adding 18.0g of polyethylene glycol into the four-neck flask after the sodium hexametaphosphate is dissolved, stirring for dissolving, introducing nitrogen, and deoxidizing to prepare a stable dispersing agent solution.
Step 2) weighing 23.0g of acrylamide and 8.0g of 2-acrylamido-2-methylpropanesulfonic acid, placing 0.008g of N, N-methylene bisacrylamide into a beaker, adding the rest of distilled water, stirring to completely dissolve the acrylamide, dropwise adding 3.0g N-vinyl pyrrolidone under stirring to fully dissolve and mix the acrylamide and the N, N-methylene bisacrylamide, adding sodium hydroxide solution with the mass fraction of 40% to adjust the pH value to 7.0, introducing nitrogen to remove oxygen, and preparing a reaction monomer mixed solution.
And 3) adding a reaction monomer mixed solution into the prepared stable dispersing agent solution under stirring, uniformly stirring, then heating to 55 ℃, dropwise adding 2.5g of 1.0% 2,2' -azobisisobutylaminidine dihydrochloride aqueous solution under the protection of nitrogen, dropwise adding for about 30min, controlling the reaction temperature to 55 ℃, reacting for 1.5h, and stopping the reaction to obtain the water-based polymer P (AM/AMPS/NVP) nanoparticle emulsion, namely the water-based polymer nanoparticle high-temperature filtrate reducer (PAAN-1).
The invention is to dissolve the reaction monomer, initiator and cross-linking agent in the aqueous solution using polyethylene glycol as dispersing agent to form a homogeneous system for polymerization. Along with the progress of the polymerization reaction, when the molecular weight of the polymer is larger than the molecular weight of the critical phase, the polymer is separated out to form a dispersed phase of the nano polymer microsphere and is suspended in an aqueous phase taking polyethylene glycol as a dispersing agent to form the water-based polymer nano microsphere emulsion. Compared with the inverse suspension polymerization and inverse emulsion polymerization methods, the preparation method of the polymer microsphere has the characteristics of simple synthesis process operation, fast reaction heat transfer, stable system, low polymerization system viscosity, environmental friendliness and the like.
Example 2:
the embodiment provides a water-based polymer nanoparticle high temperature resistant filtrate reducer, which is prepared by taking 100g of polymer nanoparticle as an example and is prepared by reacting the following substances in mass: 24.0g of Acrylamide (AM), 6.0g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and 4.0g of g N-vinylpyrrolidone (NVP), 16.0g of polyethylene glycol, 1.0g of sodium hexametaphosphate, 0.005g of crosslinking agent, 0.020 g of initiator and the balance of water.
In this example, the weight percent of the reactive monomer was 34.0%, the weight percent of polyethylene glycol was 16.0%, the weight percent of sodium hexametaphosphate was 1.0%, the weight percent of the crosslinker was 0.005%, and the weight percent of the initiator was 0.020%.
The preparation process comprises the following steps:
step 1) weighing 1.0g of sodium hexametaphosphate, placing the sodium hexametaphosphate into a four-neck flask, adding 16.0g of distilled water under stirring, adding 16.0g of polyethylene glycol into the four-neck flask after the sodium hexametaphosphate is dissolved, stirring for dissolving, introducing nitrogen, and deoxidizing to prepare a stable dispersing agent solution.
Step 2) weighing 24.0g of acrylamide and 6.0g of 2-acrylamido-2-methylpropanesulfonic acid, placing 0.005g of N, N-methylene bisacrylamide into a beaker, adding the rest of distilled water, stirring to completely dissolve the acrylamide, dropwise adding 4.0g N-vinyl pyrrolidone under stirring to fully dissolve and mix the acrylamide and the N, N-methylene bisacrylamide, adding sodium hydroxide solution with the mass fraction of 40% to adjust the pH value to 7.0, introducing nitrogen to remove oxygen, and preparing a reaction monomer mixed solution.
And 3) adding a reaction monomer mixed solution into the prepared stable dispersing agent solution under stirring, uniformly stirring, then heating to 50 ℃, dropwise adding 2.0g of 1.0% 2,2' -azobisisobutylaminidine dihydrochloride aqueous solution under the protection of nitrogen, dropwise adding for about 30min, controlling the reaction temperature to 50 ℃, reacting for 2.0h, and stopping the reaction to obtain the water-based polymer P (AM/AMPS/NVP) nanoparticle emulsion, namely the water-based polymer nanoparticle high-temperature filtrate reducer (PAAN-2).
Example 3:
the embodiment provides a water-based polymer nanoparticle high temperature resistant filtrate reducer, which is prepared by taking 100g of polymer nanoparticle as an example and is prepared by reacting the following substances in mass: 20.0g of Acrylamide (AM), 10.0g of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and 2.0g of g N-vinylpyrrolidone (NVP), 18.0g of polyethylene glycol, 2.0g of sodium hexametaphosphate, 0.010g of crosslinking agent, 0.030 g of initiator and the balance of water.
In this example, the weight percent of the reactive monomer was 32.0%, the weight percent of polyethylene glycol was 18.0%, the weight percent of sodium hexametaphosphate was 12.0%, the weight percent of the crosslinker was 0.010%, and the weight percent of the initiator was 0.030%.
The preparation process comprises the following steps:
step 1) weighing 2.0g of sodium hexametaphosphate, placing the sodium hexametaphosphate into a four-neck flask, adding 16.0g of distilled water under stirring, adding 18.0g of polyethylene glycol into the four-neck flask after the sodium hexametaphosphate is dissolved, stirring for dissolving, introducing nitrogen, and deoxidizing to prepare a stable dispersing agent solution.
Step 2) weighing 20.0g of acrylamide and 10.0g of 2-acrylamido-2-methylpropanesulfonic acid, placing 0.01g of N, N-methylene bisacrylamide in a beaker, adding the rest of distilled water, stirring to completely dissolve the acrylamide, dropwise adding 2.0g N-vinyl pyrrolidone under stirring to fully dissolve and mix the acrylamide and the N, N-methylene bisacrylamide, adding sodium hydroxide solution with the mass fraction of 40% to adjust the pH value to 7.0, introducing nitrogen to remove oxygen, and preparing a reaction monomer mixed solution.
And 3) adding a reaction monomer mixed solution into the prepared stable dispersing agent solution under stirring, uniformly stirring, then heating to 60 ℃, dropwise adding 3.0g of 1.0% 2,2' -azobisisobutylaminidine dihydrochloride aqueous solution under the protection of nitrogen, dropwise adding for about 30min, controlling the reaction temperature to 60 ℃, reacting for 1.0h, and stopping the reaction to obtain the water-based polymer P (AM/AMPS/NVP) nanoparticle emulsion, namely the water-based polymer nanoparticle high-temperature filtrate reducer (PAAN-3).
Example 4:
the embodiment provides application of a water-based polymer nano microsphere high-temperature-resistant filtrate reducer in oil and gas well drilling fluid.
When the filtrate reducer is used independently, the dosage is 3.0-6.0% of the volume percentage of the slurry.
Application performance test:
(1) Base slurry preparation method
400mL tap water is taken, 12.0 g sodium bentonite and 1.2g sodium hydroxide are added, stirring is carried out for 20 min at high speed, the stirring is interrupted at least twice to scrape off the sample adhered to the wall of the cup, and the sample is maintained in a sealed manner at the temperature of (25+/-1) ℃ for 24 h.
(2) Slurry preparation method
To 400mL of the base slurry was added a volume fraction of 6.0% water-based polymer nanosphere high temperature filtrate reducer PAAN-1, and stirring was carried out at high speed for 20 min, with at least two interruptions therebetween to scrape off the sample adhering to the cup wall. The sample slurry was transferred to a curing tank, rolled at 200℃for 16h, taken out of the curing tank, cooled and opened.
(3) High temperature and high pressure fluid loss performance test
According to national standard of the people's republic of China GB/T16783.1-2006 "Petroleum and Natural gas industry drilling fluid field test part 1: test method in Water-based drilling fluid "the water-based polymer nanoparticle high temperature filtrate loss additives PAAN-1, PAAN-2 and PAAN-3 prepared in examples 1-3 were subjected to performance tests. The high-temperature high-pressure filtration loss HTHP of the water-based polymer nano microsphere high-temperature filtrate reducer slurry after being aged for 16 hours at 200 ℃ is shown in table 1.
Table 1 high temperature high pressure fluid loss of water based polymer nanoparticle high temperature fluid loss additives
In order to further illustrate the application performance of the water-based polymer nano microsphere in high-temperature fluid loss, taking the water-based polymer nano microsphere high-temperature fluid loss agent PAAN-1 as an example, the initial particle size distribution of the nano microsphere is shown in figure 1, the median value of the initial particle size is 115.6nm, the median value of the particle size of the microsphere after swelling in water for 24 hours is 27.5 mu m, and the swelling multiplying power is 238 times, and is shown in figure 2.
After the base slurry and the slurry containing the water-based polymer nano-microsphere high-temperature filtrate reducer PAAN-1 roll at 200 ℃ for 16h, the particle size distribution of clay particles before and after aging of the base slurry and the slurry containing the water-based polymer nano-microsphere high-temperature filtrate reducer PAAN-1 is shown in figures 3-6, the median value of the particle sizes of the clay particles before and after aging of the base slurry is 8.82 mu m and 155.25 mu m, the median value of the particle sizes of the clay particles before and after aging of the slurry containing the water-based polymer nano-microsphere high-temperature filtrate reducer PAAN-1 is 7.85 mu m and 19.69 mu m, the particle sizes of the clay particles before aging of the base slurry and the slurry containing the water-based polymer nano-microsphere high-temperature filtrate reducer PAAN-1 are equivalent, and the particle sizes of the clay particles in the base slurry after aging are far larger than those of the slurry containing the water-based polymer nano-microsphere high-temperature filtrate reducer PAAN-1.
The microscopic pictures of the aggregation state of clay particles of the slurry of the base slurry and the water-based polymer nano-microsphere added high-temperature filtrate reducer PAAN-1 after aging are shown in figures 7-8, the pictures show that the aggregation volume of the clay particles in the base slurry is large, the aggregation volume of the clay particles of the slurry of the water-based polymer nano-microsphere added high-temperature filtrate reducer PAAN-1 is small, and the observation result is consistent with the particle size distribution of the clay particles of the slurry of the base slurry and the water-based polymer nano-microsphere added high-temperature filtrate reducer PAAN-1.
The scanning electron microscope pictures of the surface of the filter cake after the aging of the base slurry and the water-based polymer nano microsphere added PAAN-1 slurry are shown in figures 9-10, and the pictures show that the network structure of the base slurry filter cake is loose, the surface is rough, and the network structure of the surface of the filter cake of the slurry added with the water-based polymer nano microsphere added PAAN-1 slurry is compact, flat and fine. Test results show that the nano microspheres in the water-based polymer nano microsphere high-temperature filtrate reducer PAAN-1 have good water absorption expansion performance and strong dispersion capacity, can effectively prevent clay particles in slurry from being aggregated at high temperature, can form a relatively compact network structure film on the surface of a filter cake, and can effectively reduce the filtrate loss of the slurry at high temperature.
Example 5:
based on example 4, this example provides an application of a water-based polymer nanoparticle anti-high temperature filtrate reducer in oil and gas well drilling fluid, the filtrate reducer and water-based SiO 2 When the nano emulsion is compounded and used, the mass percent of the filtrate reducer is 50.0-70.0%, and the mass percent of the water-based SiO is the same as that of the filtrate reducer 2 The mass percentage of the nano emulsion is 30.0-50.0%.
The SiO is 2 The particle size of the nano particles is 20 nm-200 nm.
In the embodiment, only the water-based polymer nano microsphere high-temperature filtrate reducer PAAN-1 is taken as an example, and the specific process is as follows:
putting the water-based polymer P (AM/AMPS/NVP) nanometer microsphere emulsion into a container, stirring, and slowly adding water-based SiO 2 The nano emulsion is uniformly mixed to obtain the organic/inorganic nano microsphere composite high-temperature filtrate reducer. The composition of the water-based organic/inorganic nano microsphere composite high-temperature filtrate reducer and the high-temperature high-pressure filtrate loss after rolling for 16h at 200 ℃ are shown in Table 2.
TABLE 2 Water-based Polymer nanospheres and SiO 2 Nano emulsion compound filtration loss
The invention relates to a water-based polymer nano microsphere high-temperature filtrate reducer and inorganic nano SiO 2 The microemulsion is compounded and used as a drilling fluid high-temperature filtrate reducer, the characteristics of high-temperature dimensional stability, high surface activity, high-temperature deformability, embedding, covering, crosslinking and the like of an inorganic nano material can be utilized to achieve the purpose of reducing the drilling fluid filtrate loss at high temperature and high pressure, and the high-temperature micro-nano filtrate reducer can be prepared by adjusting the mass ratio of the organic nano microsphere emulsion and the inorganic micro-nano emulsion according to the field reality, so that the field production requirement is met.
As can be seen from tables 1 and 2, although the water-based polymer nanoparticle high temperature filtrate reducer and the inorganic nano SiO 2 The filtering loss of the microemulsion composite is larger than that of the single water-based polymer nano microsphere at high temperatureThe filtrate loss reducer, as seen in comparative example 1, is much smaller than the inorganic nano SiO alone 2 Due to the inorganic nano SiO 2 Easy to obtain, low in cost and inorganic nano SiO 2 The particles can provide a large number of nucleation center particles, so that clay particles in drilling fluid can be gathered and grown around the large number of nucleation particles, the dispersion of the clay particles can be promoted, the clay particles are not gathered and grown too much, and therefore, under the condition that the fluid loss meets the field requirement, the clay particles and the clay particles are selected to be compounded.
And the filling and the blocking of the micro-gaps and the micro-pores of the rock wall are realized through the permeation and bridging effects of the micro-nano particles, meanwhile, the organic nano particles are easy to expand and deform at high temperature, inlay, cover and crosslink, micropores in a filter cake are blocked, a network structure film is formed on the surface of a mud cake, and the drilling fluid loss is reduced.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (8)
1. A water-based polymer nano microsphere high temperature resistant filtrate reducer is characterized in that: the catalyst is prepared by reacting the following substances in percentage by weight: 28.0 to 39.0 percent of reaction monomer, 16.0 to 20.0 percent of polyethylene glycol, 1.0 to 2.0 percent of sodium hexametaphosphate, 0.005 to 0.010 percent of cross-linking agent, 0.020 to 0.040 percent of initiator and the balance of water.
2. The water-based polymer nanoparticle high temperature resistant fluid loss additive of claim 1, wherein: the reaction monomer comprises the following substances in percentage by weight: 20.0 to 25.0 percent of acrylamide, 6.0 to 10.0 percent of 2-acrylamido-2-methylpropanesulfonic acid and 2.0 to 4.0 percent of N-vinyl pyrrolidone.
3. The water-based polymer nanoparticle high temperature resistant fluid loss additive of claim 1, wherein: the cross-linking agent is N, N-methylene bisacrylamide, and the initiator is 2,2' -azo diisobutyl amidine dihydrochloride.
4. The method for preparing the water-based polymer nanoparticle high-temperature-resistant filtrate reducer, which is characterized in that: the method comprises the following steps:
step 1) uniformly mixing a formula amount of reaction monomer, a crosslinking agent and a proper amount of water, adjusting the pH value to 7.0, introducing nitrogen and deoxidizing to obtain a reaction monomer mixed solution;
step 2) stirring and mixing the sodium hexametaphosphate, polyethylene glycol and the residual water according to the formula amount, introducing nitrogen and deoxidizing to obtain a stable dispersing agent solution;
step 3) adding the reaction monomer mixed solution into the stable dispersing agent solution under the stirring action, heating to 50-60 ℃ under the protection of nitrogen after uniformly stirring, then dropwise adding the initiator solution, and reacting for 1-2h at 50-60 ℃ after dripping, thus obtaining the water-based polymer nano microsphere emulsion which is the water-based polymer nano microsphere high temperature resistant filtrate reducer.
5. The use of a water-based polymer nanoparticle anti-high temperature fluid loss additive in oil and gas well drilling fluid according to claim 1.
6. The application of the water-based polymer nano microsphere high-temperature-resistant filtrate reducer in oil and gas well drilling fluid, which is characterized in that: when the filtrate reducer is used independently, the dosage is 3.0-6.0% of the volume percentage of the slurry.
7. The application of the water-based polymer nano microsphere high-temperature-resistant filtrate reducer in oil and gas well drilling fluid, which is characterized in that: the filtrate reducer and water-based SiO 2 When the nano emulsion is compounded and used, the mass percent of the filtrate reducer is 50.0-70.0%, and the mass percent of the water-based SiO is the same as that of the filtrate reducer 2 The mass percentage of the nano emulsion is 30.0-50.0%.
8. The water-based polymer nanoparticle high-temperature-resistant filtrate reducer for oil and gas well drilling according to claim 7The application in well liquid is characterized in that: the SiO is 2 The particle size of the nano particles is 20 nm-200 nm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111909306A (en) * | 2020-08-14 | 2020-11-10 | 西安石油大学 | Double-aqueous-phase PAM/AMPS nano microsphere latex as well as preparation method and application thereof |
| CN112341570A (en) * | 2020-11-28 | 2021-02-09 | 西安石油大学 | Double-aqueous-phase polyacrylamide terpolymer nano microsphere emulsion and preparation method thereof |
| US20210155730A1 (en) * | 2019-11-25 | 2021-05-27 | Yangtze University | Temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer and preparation method thereof |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210155730A1 (en) * | 2019-11-25 | 2021-05-27 | Yangtze University | Temperature-resistant and anti-collapse multi-branched polymer fluid loss reducer and preparation method thereof |
| CN111909306A (en) * | 2020-08-14 | 2020-11-10 | 西安石油大学 | Double-aqueous-phase PAM/AMPS nano microsphere latex as well as preparation method and application thereof |
| CN112341570A (en) * | 2020-11-28 | 2021-02-09 | 西安石油大学 | Double-aqueous-phase polyacrylamide terpolymer nano microsphere emulsion and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| YUXIU AN等: "Synthesis of nanop-plugging agent based on AM/AMPS/NVP terpolymer", 《JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING》, vol. 135, pages 505 - 514, XP029308863, DOI: 10.1016/j.petrol.2015.10.014 * |
| 李羚露: "醇水介质中阳离子型聚丙烯酰胺的制备与表征", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 2, pages 014 - 207 * |
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