CN117645688B - Preparation method of steering agent for pressure driving - Google Patents
Preparation method of steering agent for pressure driving Download PDFInfo
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- CN117645688B CN117645688B CN202410114419.3A CN202410114419A CN117645688B CN 117645688 B CN117645688 B CN 117645688B CN 202410114419 A CN202410114419 A CN 202410114419A CN 117645688 B CN117645688 B CN 117645688B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- 239000000178 monomer Substances 0.000 claims abstract description 27
- 229960003237 betaine Drugs 0.000 claims abstract description 18
- UYERIVYDSGUOJG-UHFFFAOYSA-N morpholine;prop-2-enamide Chemical compound NC(=O)C=C.C1COCCN1 UYERIVYDSGUOJG-UHFFFAOYSA-N 0.000 claims abstract description 18
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 14
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 claims abstract description 12
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 48
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 38
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 19
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- LCEDQNDDFOCWGG-UHFFFAOYSA-N morpholine-4-carbaldehyde Chemical compound O=CN1CCOCC1 LCEDQNDDFOCWGG-UHFFFAOYSA-N 0.000 claims description 16
- 239000002904 solvent Substances 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000012074 organic phase Substances 0.000 claims description 12
- 238000000605 extraction Methods 0.000 claims description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 9
- HFBMWMNUJJDEQZ-UHFFFAOYSA-N acryloyl chloride Chemical compound ClC(=O)C=C HFBMWMNUJJDEQZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 8
- 239000012279 sodium borohydride Substances 0.000 claims description 8
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- DILRJUIACXKSQE-UHFFFAOYSA-N n',n'-dimethylethane-1,2-diamine Chemical compound CN(C)CCN DILRJUIACXKSQE-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 5
- 239000007810 chemical reaction solvent Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims 4
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000002347 injection Methods 0.000 abstract description 24
- 239000007924 injection Substances 0.000 abstract description 24
- 150000003839 salts Chemical class 0.000 abstract description 5
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical group C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000007334 copolymerization reaction Methods 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
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- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- AVWKSSYTZYDQFG-UHFFFAOYSA-M dimethyl-octadecyl-prop-2-enylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC=C AVWKSSYTZYDQFG-UHFFFAOYSA-M 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- VFRQEVIIBMUKCQ-UHFFFAOYSA-M ethyl-dimethyl-(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].CC[N+](C)(C)CCOC(=O)C=C VFRQEVIIBMUKCQ-UHFFFAOYSA-M 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to the technical field of steering agents, and discloses a preparation method of a steering agent for pressure driving, which uses an acrylamide morpholine betaine monomer as a functional monomer to carry out copolymerization reaction with acrylamide and methacryloyloxyethyl trimethyl ammonium chloride to obtain the steering agent for pressure driving; functional betaine groups and a rigid large-group morpholine structure are introduced into a polymer main chain, so that the temperature resistance and salt resistance of the steering agent for driving can be improved, the steering agent for driving is injected in fracturing water injection, the steering agents for driving mutually coalesce to form a cushion pad capable of resisting compression deformation, the bearing area of the top of a crack is increased, and the pressure intensity of the top of the crack is greatly reduced. After the subsequent water injection, the water is forced to flow towards the side wings, when the pressure of the side wings is continuously increased, the side wings are opened, the cracks are forced to turn, and the expansion of the swept volume of the subsequent injected water is ensured. Thus having good injection performance and steering performance.
Description
Technical Field
The invention relates to the technical field of steering agents, in particular to a preparation method of a steering agent for pressure driving.
Background
The near-pressure driving steering technology is to perform high-pressure water injection near the fracture pressure of an oil layer, not to open a main seam near a well hole, and to open a reservoir layer to form a net seam and a seam net of the main seam, and simultaneously, the pores are also used for water absorption and oil displacement, so that a dual-medium driving mode is formed for oil displacement; after displacement for a period of time, because the water injection is formed to be suddenly advanced, the flooding steering agent is started to be injected, the front edge of the flooding water injection is regulated, the water line is restrained from advancing, the crack direction and the displacement direction are changed, the sweep volume is enlarged, the repeated alternate injection is carried out for many times, the sweep volume is further enlarged, and the method has the advantages of small daily injection quantity, easiness in operation, large sweep volume, long anhydrous oil recovery period, high recovery ratio and the like.
In recent years, the development of a novel efficient steering agent is a research hotspot, and the invention patent CN110483689B discloses that methacryloyloxyethyl trimethyl ammonium chloride, octadecyl dimethyl allyl ammonium chloride, 1-carboxyl-N, N-dimethyl-N-methacrylamide propyl inner salt and acrylamide monomers are taken as raw materials, and the acidizing steering agent is obtained by polymerization, and has the advantages of good heat stability, strong temperature resistance, good steering effect and the like; but the diverter does not exhibit good salt resistance, injectability and blocking properties.
Disclosure of Invention
The technical problems to be solved are as follows: the steering agent for the pressure driving solves the problems of poor heat resistance and salt resistance, poor injection performance and poor plugging performance of the traditional steering agent.
Technical proposal
The preparation method of the steering agent for the pressure driving comprises the following steps: three polymeric monomers are added to water: acrylamide, acrylamide morpholine betaine monomer, methacryloxyethyl trimethyl ammonium chloride, stirring and dissolving, heating to 50-65 ℃, dropwise adding an aqueous solution containing azo diisobutylamidine hydrochloride, reacting for 4-7h, filtering, washing with water and ethanol in sequence, drying, and crushing into particles to obtain the diverter for pressure driving;
the chemical structural formula of the acrylamide morpholine betaine monomer is as follows:。
further, the mass ratio of the acrylamide to the acrylamide morpholine betaine monomer to the methacryloxyethyl trimethyl ammonium chloride is 100 (15-30) to 6-10.
Further, the mass of the azobisisobutyrimidine hydrochloride is 0.8 to 1% of the total mass of the three polymerization monomers.
Further, the preparation method of the acrylamide morpholine betaine monomer comprises the following steps:
(1) Adding N-formylmorpholine and N, N-dimethylethylenediamine into ethanol, reacting at 50-70 ℃ for 3-6h, cooling to room temperature, adding sodium borohydride, reacting for 2-5-h, concentrating to remove ethanol, adding dichloromethane and 10-20% acetic acid solution, oscillating, standing for layering, extracting, and concentrating an organic phase to obtain an intermediate A.
(2) Adding triethylamine, an intermediate A and acryloyl chloride into a reaction solvent, reacting for 20-40min at 0-10 ℃, then reacting for 4-8h at 20-35 ℃, concentrating to remove the solvent, adding dichloromethane and water, oscillating, standing for layering, and concentrating an organic phase after extraction to obtain an intermediate B.
(3) Adding 1, 3-propane sultone into acetone, reacting intermediate B, concentrating to remove solvent, recrystallizing the product in ethanol water solution to obtain acrylamide morpholine betaine monomer.
Further, in the step (1), the mass ratio of the N-formylmorpholine, the N, N-dimethylethylenediamine and the sodium borohydride is 100 (72-80) to 64-85.
Further, the reaction solvent in the step (2) comprises ethyl acetate, dichloromethane and acetone.
Further, in the step (2), the mass ratio of the triethylamine, the intermediate A and the acryloyl chloride is (50-65) 100 (48-60).
Further, in the step (3), the mass ratio of 1, 3-propane sultone to the intermediate B is (45-56) 100.
Further, the reaction temperature in the step (3) is 35-50 ℃ and the reaction time is 4-10h.
The invention has the technical effects that: the invention uses acrylamide morpholine betaine monomer as functional monomer to carry out copolymerization reaction with acrylamide and methacryloyloxyethyl trimethyl ammonium chloride to obtain the diverter for pressure driving; functional betaine groups and rigid large-group morpholine structures are introduced into a polymer main chain, so that the temperature resistance and the salt resistance of the steering agent for driving can be improved; and the betaine group has good hydrophilicity, which is beneficial to improving the hydrophilicity and expansion multiple of the diverter for pressure driving.
In frac water injection, the hydraulic force advances in the direction of maximum pressure, and the injected water can only clean crude oil along the vicinity of the fracture. The water injection is faster. After a certain amount of water is injected, the steering agent for pressure driving is injected, and the steering agents for pressure driving are mutually coalesced to form a cushion pad capable of resisting compression deformation, so that the bearing area of the top of the crack is increased, and the pressure intensity of the top of the crack is greatly reduced. After the subsequent water injection, the water is forced to flow towards the side wings, when the pressure of the side wings is continuously increased, the side wings are opened, the cracks are forced to turn, the expansion of the swept volume of the subsequent injected water is ensured, and therefore, the water injection device has good injection performance and turning performance. By utilizing the extrusion shrinkage resistance of the steering agent, hydraulic impact is relieved, meanwhile, the acting force at the top is dispersed, injection pressure is forced to concentrate to the side part, a new water injection crack is generated, the swept area is further enlarged, water channeling is controlled, and the recovery ratio is improved. After the steering agent is injected, a large amount of steering agent can be automatically adhered, expanded and accumulated along the main water drive direction, so that the top pressure of the main crack is reduced, the pressure at two sides of the crack wall is increased to force the secondary crack to be opened, and the wide wave range of the crack is enlarged. Meanwhile, the large throat is blocked and filtered, the displacement of the small throat crude oil is increased, and good blocking performance is shown.
Detailed Description
Example 1
(1) 5g N-formylmorpholine and 4g of N, N-dimethylethylenediamine are added into 80mL of ethanol to react for 4 hours at 50 ℃, then the mixture is cooled to room temperature, 3.6g of sodium borohydride is added to react 5h, the ethanol is removed by concentration, dichloromethane and acetic acid solution with the mass fraction of 10% are added, oscillation, standing and layering are carried out, and an organic phase is concentrated after extraction, thus obtaining an intermediate A.
(2) 3g of triethylamine, 6g of intermediate A and 2.9g of acryloyl chloride are added into a dichloromethane solvent to react for 40min at 0 ℃, then the mixture is reacted for 4h at 35 ℃, the solvent is removed by concentration, dichloromethane and water are added, oscillation, standing and delamination are carried out, and an organic phase is concentrated after extraction, thus obtaining an intermediate B.
(3) 4.2g of 1, 3-propane sultone and 8g of intermediate B are added into acetone for reaction for 6 hours at 35 ℃, the solvent is removed by concentration after the reaction, and the product is recrystallized in 60 percent ethanol water solution by volume fraction to obtain the acrylamide morpholine betaine monomer. The reaction formula:
(4) To 100mL of water, 30g of acrylamide, 4.5g of acrylamide morpholine betaine monomer and 1.8g of methacryloxyethyl trimethyl ammonium chloride were added, the temperature was raised to 50 ℃ after stirring and dissolution, an aqueous solution containing 0.29g of azobisisobutylamidine hydrochloride was added dropwise, the reaction was carried out for 7 hours, the mixture was filtered, and the mixture was washed, dried and crushed into particles in order of water and ethanol, thereby obtaining a diverter for press-driving.
Example 2
(1) 5g N-formylmorpholine and 3.6g of N, N-dimethylethylenediamine are added into 80mL of ethanol to react for 6 hours at the temperature of 70 ℃, then the mixture is cooled to room temperature, 4g of sodium borohydride is added to react 2 h, the ethanol is removed by concentration, dichloromethane and acetic acid solution with the mass fraction of 15% are added, oscillation, standing and layering are carried out, and an organic phase is concentrated after extraction, thus obtaining an intermediate A.
(2) 3.9g of triethylamine, 6g of intermediate A and 2.9g of acryloyl chloride are added into an acetone solvent to react for 20min at 10 ℃, then the mixture is reacted for 8h at 20 ℃, the solvent is removed by concentration, dichloromethane and water are added, shaking, standing and layering are carried out, and an organic phase is concentrated after extraction, so as to obtain an intermediate B.
(3) 4.5g of 1, 3-propane sultone and 8g of intermediate B are added into acetone for reaction for 10 hours at 35 ℃, the solvent is removed by concentration after the reaction, and the product is recrystallized in 60 percent ethanol water solution by volume fraction to obtain the acrylamide morpholine betaine monomer.
(4) 30g of acrylamide, 6.8g of acrylamide morpholine betaine monomer and 2.2g of methacryloxyethyl trimethyl ammonium chloride are added into 150mL of water, the temperature is raised to 65 ℃ after stirring and dissolution, an aqueous solution containing 0.32g of azo diisobutylamidine hydrochloride is added dropwise for reaction for 5 hours, the mixture is filtered, and the water and ethanol are washed, dried and crushed into particles in sequence, so that the steering agent for the press-driving is obtained.
Example 3
(1) 5g N-formylmorpholine and 3.6g of N, N-dimethylethylenediamine are added into 80mL of ethanol to react for 3 hours at 70 ℃, then the mixture is cooled to room temperature, 4g of sodium borohydride is added to react 5h, the ethanol is removed by concentration, dichloromethane and acetic acid solution with the mass fraction of 15% are added, oscillation, standing and layering are carried out, and an organic phase is concentrated after extraction, thus obtaining an intermediate A.
(2) 3.6g of triethylamine, 6g of intermediate A and 3.6g of acryloyl chloride are added into an ethyl acetate solvent to react for 40min at 0 ℃, then the mixture is reacted for 6h at 25 ℃, the solvent is removed by concentration, dichloromethane and water are added, shaking, standing and layering are carried out, and an organic phase is concentrated after extraction to obtain an intermediate B.
(3) 3.6g of 1, 3-propane sultone and 8g of intermediate B are added into acetone for reaction for 4 hours at 50 ℃, the solvent is removed by concentration after the reaction, and the product is recrystallized in 60 percent ethanol water solution by volume fraction to obtain the acrylamide morpholine betaine monomer.
(4) 30g of acrylamide, 9g of acrylamide morpholine betaine monomer and 3g of methacryloxyethyl trimethyl ammonium chloride are added into 180mL of water, the temperature is raised to 65 ℃ after stirring and dissolution, an aqueous solution containing 0.43g of azo diisobutylamidine hydrochloride is added dropwise for reaction for 7 hours, filtration, water and ethanol are sequentially washed, dried and crushed into particles, and the diverter for press driving is obtained.
Comparative example 1
30g of acrylamide and 1.8g of methacryloxyethyl trimethyl ammonium chloride are added into 100mL of water, the temperature is raised to 50 ℃ after stirring and dissolution, an aqueous solution containing 0.29g of azodiisobutylamidine hydrochloride is added dropwise for reaction for 7 hours, the mixture is filtered, washed with water and ethanol in sequence, dried and crushed into particles, and the diverter for press driving is obtained.
Comparative example 2
(1) 5g N-formylmorpholine and 4g of N, N-dimethylethylenediamine are added into 80mL of ethanol to react for 4 hours at 50 ℃, then the mixture is cooled to room temperature, 3.6g of sodium borohydride is added to react 5h, the ethanol is removed by concentration, dichloromethane and acetic acid solution with the mass fraction of 10% are added, oscillation, standing and layering are carried out, and an organic phase is concentrated after extraction, thus obtaining an intermediate A.
(2) Adding 3g of triethylamine, 6g of intermediate A and 2.9g of acryloyl chloride into a dichloromethane solvent, reacting for 40min at 0 ℃, then reacting for 4h at 35 ℃, concentrating to remove the solvent, adding dichloromethane and water, oscillating, standing for layering, concentrating an organic phase after extraction to obtain an intermediate B #）。
(3) 30g of acrylamide, 4.5g of intermediate B and 1.8g of methacryloxyethyl trimethyl ammonium chloride are added into 100mL of water, the temperature is raised to 50 ℃ after stirring and dissolution, an aqueous solution containing 0.29g of azodiisobutylamidine hydrochloride is added dropwise for reaction for 7 hours, the mixture is filtered, and the water and ethanol are washed, dried and crushed into particles in sequence, so that the diverter for press driving is obtained.
Viscosity test of diverter for press driving: adding the diverter for pressure driving into deionized water to prepare a solution with the concentration of 1.5%, and testing the apparent viscosity of the solution by adopting a viscosimeter at the test temperature of 25-80 ℃ and the test rotating speed of 100 r/min.
Table 1 viscosity test of diverter for pressure flooding
Examples 1-3 have a viscosity of only 2.3-4.9 mPas at 25 ℃; and the viscosity is only 4.6-9.5 mPas at 80 ℃.
And (3) testing the dispersibility of the steering agent for the pressure driving: adding the diverter for pressure flooding into deionized water or formation water to prepare a solution with the concentration of 1.5%, standing for 14 days at 25 ℃ and observing whether the solution has precipitation or layering.
Table 2 test of dispersibility of steering agent for pressure flooding
The diverter for press-driving prepared in examples 1 to 3 contains functional betaine groups, and can improve the hydrophilicity and the dispersibility in water of the diverter for press-driving.
And (3) testing expansion times of the steering agent for pressure driving: weighing a certain mass of steering agent for pressure driving, soaking in deionized water for 24 hours at 25-80 ℃, taking out and wiping surface moisture, weighing, and calculating expansion multiple W, wherein W= (M-M) 0 ）/M 0 The method comprises the steps of carrying out a first treatment on the surface of the M is the mass after water absorption, M 0 Is the mass before water absorption.
Table 3 expansion fold test of steering agent for pressure driving
The diverter for press driving prepared in the examples 1-3 contains functional betaine groups, can improve the hydrophilicity and the temperature resistance of the diverter for press driving, and can maintain good expansion coefficient of water absorption at high temperature.
The injection performance test of the steering agent for the pressure driving adopts an injection performance test device to test the injection capability of the steering agent for the pressure driving, and the injection performance test device is as follows: the device comprises distilled water, an ISCO advection pump, an intermediate container, a precise pressure gauge, a storage simulation system, a sleeve pump, a back pressure valve, a metering device and a pressure-converging pump.
The injection capacity of the steering agent for the pressure drive is represented by the resistance coefficient, and the smaller the resistance coefficient is, the better the injection performance is.
Extracting a natural rock core, drying and measuring dry weight; saturated water of the core is measured for wet weight, and the pore volume and the core permeability are calculated; injecting the diverter solution for pressure driving with the concentration of 1.5% into the diverter solution for pressure driving with the concentration of 5PV at the pump speed of 0.5mL/min, and recording the pressure change; changing the core permeability, and repeating the steps; and calculating a resistance coefficient. Resistance coefficient calculation formula: drag coefficient cd=f/(0.5·p·v) 2 A); f is the resistance, p is the density, v is the velocity, and A is the orthographic projected area.
Table 4 injection performance test of diverter for pressure flooding
The steering agent for press driving prepared in examples 1-3 has a resistance coefficient of only 1.6-2.6 and has good injection performance.
The plugging performance test of the diverter for pressure driving comprises the steps of extracting a natural rock core, drying and measuring dry weight; saturated water of the core is measured for wet weight, and the pore volume and the core permeability are calculated; the diverter solution for pressure flooding was injected at a concentration of 1.5% at a pump rate of 0.5mL/min to 5PV of diverter solution for pressure flooding, and the pressure change was recorded. Placing the core in an oil reservoir, aging for 7 days, performing subsequent water flooding, and recording pressure change; changing the core permeability, and repeating the steps; and testing the plugging rate.
Table 5 test of plugging properties of diverter for pressure flooding
In examples 1-3, acrylamide and acrylamide morpholine betaine monomer (methyl acryloyloxyethyl trimethyl ammonium chloride) are used as polymerization monomers, and the prepared diverter for pressure driving has a blockage of 87.9-95.8%.
Claims (8)
1. The preparation method of the steering agent for the pressure driving is characterized by comprising the following steps of: three polymeric monomers are added to water: acrylamide, acrylamide morpholine betaine monomer, methacryloxyethyl trimethyl ammonium chloride, stirring and dissolving, heating to 50-65 ℃, dropwise adding an aqueous solution containing azo diisobutylamidine hydrochloride, reacting for 4-7h, filtering, washing with water and ethanol in sequence, drying, and crushing into particles to obtain the diverter for pressure driving;
the chemical structural formula of the acrylamide morpholine betaine monomer is as follows:
；
the mass ratio of the acrylamide to the acrylamide morpholine betaine monomer to the methacryloxyethyl trimethyl ammonium chloride is 100 (15-30) to 6-10.
2. The method for producing a steering agent for press-driving according to claim 1, wherein the mass of the azobisisobutyrimidine hydrochloride is 0.8 to 1% of the total mass of the three kinds of polymerized monomers.
3. The method for preparing a diverter for press-driving according to claim 1, wherein the method for preparing an acrylamide morpholinobetaine monomer comprises the steps of:
(1) Adding N-formylmorpholine and N, N-dimethylethylenediamine into ethanol, reacting at 50-70 ℃ for 3-6 hours, cooling to room temperature, adding sodium borohydride, reacting for 2-5 hours, concentrating to remove ethanol, adding dichloromethane and acetic acid solution, oscillating, standing for layering, extracting, and concentrating an organic phase to obtain an intermediate A;
(2) Adding triethylamine, an intermediate A and acryloyl chloride into a reaction solvent, reacting for 20-40min at 0-10 ℃, then reacting for 4-8h at 20-35 ℃, concentrating to remove the solvent, adding dichloromethane and water, oscillating, standing for layering, and concentrating an organic phase after extraction to obtain an intermediate B;
(3) Adding 1, 3-propane sultone into acetone, reacting intermediate B, concentrating to remove solvent, recrystallizing the product in ethanol water solution to obtain acrylamide morpholine betaine monomer.
4. The method for preparing a diverter for pressure flooding according to claim 3, wherein the mass ratio of N-formylmorpholine, N-dimethylethylenediamine and sodium borohydride in the step (1) is 100 (72-80): 64-85).
5. The method of producing a diverter for press-driving according to claim 3, wherein the reaction solvent in the step (2) comprises ethyl acetate, methylene chloride, and acetone.
6. The method for producing a pressure-sensitive steering agent for a pressure-sensitive drive according to claim 3, wherein the mass ratio of triethylamine, intermediate A and acrylic acid chloride in the step (2) is (50-65) to (48-60) 100.
7. The method of producing a pressure-sensitive steering agent for a vehicle according to claim 3, wherein the mass ratio of 1, 3-propane sultone to intermediate B in step (3) is (45-56) to 100.
8. The method for preparing a diverter for press-driving according to claim 3, wherein the reaction temperature in the step (3) is 35-50 ℃ and the reaction time is 4-10h.
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| CN110483689A (en) * | 2019-08-21 | 2019-11-22 | 西南石油大学 | A kind of acidification steering polymer, preparation method, acidified diverting agent |
| CN113322053A (en) * | 2021-04-14 | 2021-08-31 | 中国石油天然气股份有限公司 | Temporary blocking steering system and preparation method thereof |
| CN114380946A (en) * | 2020-10-22 | 2022-04-22 | 中国石油天然气股份有限公司 | Self-tackifying steering acid liquid thickener and preparation method and application thereof |
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| US20230055352A1 (en) * | 2020-01-10 | 2023-02-23 | The Curators Of The University Of Missouri | Re-crosslinkable particle for conformance control and temporary plugging |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483689A (en) * | 2019-08-21 | 2019-11-22 | 西南石油大学 | A kind of acidification steering polymer, preparation method, acidified diverting agent |
| CN114380946A (en) * | 2020-10-22 | 2022-04-22 | 中国石油天然气股份有限公司 | Self-tackifying steering acid liquid thickener and preparation method and application thereof |
| CN113322053A (en) * | 2021-04-14 | 2021-08-31 | 中国石油天然气股份有限公司 | Temporary blocking steering system and preparation method thereof |
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