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CN-121991677-A - Slick water drag reducer and preparation method and application thereof

CN121991677ACN 121991677 ACN121991677 ACN 121991677ACN-121991677-A

Abstract

The invention discloses a slickwater drag reducer, and a preparation method and application thereof, and relates to the technical field of petroleum industry. The invention discloses a slickwater drag reducer which comprises, by weight, 200-350 parts of a solvent, 1-5 parts of a thixotropic agent, 150-200 parts of polyacrylamide and a derivative thereof, and 4-8 parts of a surfactant, wherein the thixotropic agent is silane coupling agent modified magnesium lithium silicate. According to the invention, the silane coupling agent modified magnesium lithium silicate is used as the thixotropic agent, so that better thixotropic property can be obtained under the condition of less use amount of the thixotropic agent, the content of water insoluble substances in the slickwater drag reducer is reduced, and the damage to an oil-gas reservoir is reduced.

Inventors

  • LIN HAI
  • ZHANG SHAOBIN
  • ZHAO ENDONG
  • LIU YOUMING
  • XIAO QIAN
  • LIU SHIDUO
  • WAN YOUYU
  • WANG ZHICHENG
  • ZHANG CHENGJUAN
  • ZHANG LI
  • FENG XINYUAN
  • LEI FENGYU
  • FU YING

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (10)

  1. 1. A slick water drag reducer is characterized by comprising, by weight, 200-350 parts of a solvent, 1-5 parts of a thixotropic agent, 150-200 parts of polyacrylamide and a derivative thereof, and 4-8 parts of a surfactant, wherein the thixotropic agent is silane coupling agent modified magnesium lithium silicate.
  2. 2. The slickwater drag reducer of claim 1 wherein said silane coupling agent modified magnesium lithium silicate is prepared by a process comprising: adding lithium magnesium silicate into water, adjusting the pH value to 4-7, and heating and activating to obtain activated slurry; And adding a cationic silane coupling agent solution into the activated slurry for modification treatment, and then filtering and drying to obtain the silane coupling agent modified magnesium lithium silicate.
  3. 3. The slickwater drag reducer of claim 2 wherein, The temperature of the heating and activating is 30-50deg.C, the time is 20-40min, and/or The temperature of the modification treatment is 70-90 ℃ and the time is 3-6h, and/or The cationic silane coupling agent solution comprises a cationic silane coupling agent, organic alcohol and water, wherein the mass ratio of the cationic silane coupling agent to the organic alcohol to the water is 10 (15-20) (70-75), and the cationic silane coupling agent is a C 12 -C 18 alkyl cationic silane coupling agent.
  4. 4. The slickwater drag reducer of claim 3 wherein the mass ratio of the raw cationic silane coupling agent to the lithium magnesium silicate is (5-25): 100 in the process for preparing the silane coupling agent modified lithium magnesium silicate.
  5. 5. The slickwater drag reducer of claim 3 wherein said C 12 -C 18 alkyl cationic silane coupling agent is at least one of 3- (triethoxysilyl) propyldimethyldodecylammonium chloride, 3- (triethoxysilyl) propyldimethyloctadecylammonium chloride.
  6. 6. The slickwater drag reducer of any one of claims 1 to 5, wherein the solvent is at least one of polyethylene glycol 200, polyethylene glycol 400, and ethylene glycol diethyl ester, the surfactant is at least one of fatty alcohol polyoxyethylene ether, and fluorocarbon surfactant, and the polyacrylamide and its derivatives are at least one of polyacrylamide, poly (sodium acrylamide-acrylate-2-acrylamide-2-methylpropanesulfonate), poly (acrylamide-methacryloxyethyl trimethyl ammonium chloride), and poly (sodium acrylamide-acrylate-2-acrylamide-2-methylpropanesulfonic acid-2-acrylamidoalkylsodium sulfonate).
  7. 7. The slickwater drag reducer of claim 6 wherein said fatty alcohol polyoxyethylene ether is at least one of AEO-7, AEO-9, said fluorocarbon surfactant is FS-51, and said polyacrylamide and its derivatives have a weight average molecular weight of 500-1000 tens of thousands.
  8. 8. A method of preparing a slickwater drag reducer according to any one of claims 1 to 7 comprising the steps of: s1, adding a solvent into a container according to a proportion, adding a thixotropic agent, and carrying out first homogenization to obtain a first mixed material; s2, mixing the first mixed material with a surfactant, and performing second homogenization to obtain a second mixed material; And S3, mixing the second mixed material with polyacrylamide and derivatives thereof, and carrying out third homogenization to obtain the slickwater drag reducer.
  9. 9. The method of producing a slickwater drag reducer of claim 8 wherein said first homogenizing and said second homogenizing conditions are 8000-10000rpm for 1-5 minutes.
  10. 10. Use of a slickwater drag reducer according to any one of claims 1 to 7 or a slickwater drag reducer made by a method of making according to any one of claims 8 to 9 in the manufacture of a slickwater fracturing fluid.

Description

Slick water drag reducer and preparation method and application thereof Technical Field The invention relates to the technical field of petroleum industry, in particular to a slickwater drag reducer, a preparation method and application thereof. Background With the lifting of hot flashes generated in unconventional oil and gas resource exploitation, volume fracturing has become an effective measure for the transformation of a tight reservoir, and the slick water fracturing technology is beneficial to communication of microcracks. The technology has higher general construction discharge capacity, and the drag reducer in the slickwater fracturing fluid in construction operation has better friction resistance reducing performance to better reduce the construction pressure, thereby meeting the requirement of large-discharge construction and reducing the construction difficulty. Slick water fracturing fluids are a great demand for water, but in western regions of our country, the use of such large amounts of water for reservoir fracturing can threaten other communities to obtain fresh water and the cost of obtaining water and transporting it to well sites is high. In order to meet the demands for fresh water and save the cost, various water treatment technologies are adopted, and chemical and mechanical measures are utilized to remove solids and impurities in the return water so as to recycle the return water, but the desalination operation cost is high and the economy is poor. Therefore, the fresh water consumption is reduced to the maximum extent, the produced water and the fresh water are diluted in proportion to prepare the slickwater fracturing fluid, the wastewater treatment is reduced, and the method is the only way for reducing the operation cost and improving the oil and gas recovery ratio of unconventional stratum. The anti-drag agent is widely applied at present, namely an anti-drag emulsion system, namely an anti-drag ratio is good, the salt tolerance is less than or equal to 40000mg/L, the anti-drag agent is only suitable for medium-low mineralization water quality environments, the oil-based suspension emulsion system is large in polymer molecules, the anti-drag ratio is excellent, the salt tolerance is adjustable, but a large amount of modified bentonite is added in the production and preparation process, so that the water insoluble content of fracturing fluid is artificially increased, and the damage to a reservoir is increased. Thus, there is a need to provide a slickwater drag reducer that has both good drag reduction and salt tolerance, and that has little damage to the reservoir. Disclosure of Invention The invention mainly aims to provide a slickwater drag reducer, and a preparation method and application thereof, so as to solve the problems that the slickwater drag reducer in the prior art cannot have strong salt resistance and has little damage to a reservoir. In order to solve the technical problems, according to the first aspect of the invention, a slickwater drag reducer is provided, which comprises, by weight, 200-350 parts of a solvent, 1-5 parts of a thixotropic agent, 150-200 parts of polyacrylamide and a derivative thereof, and 4-8 parts of a surfactant, wherein the thixotropic agent is silane coupling agent modified magnesium lithium silicate. Further, the preparation method of the silane coupling agent modified magnesium lithium silicate comprises the following steps: adding lithium magnesium silicate into water, adjusting the pH value to 4-7, and heating and activating to obtain activated slurry; And adding a cationic silane coupling agent solution into the activated slurry for modification treatment, and then filtering and drying to obtain the silane coupling agent modified magnesium lithium silicate. Further, the temperature of the heating and activating is 30-50 ℃ and the time is 20-40min, and/or the temperature of the modifying treatment is 70-90 ℃ and the time is 3-6h. Further, the cationic silane coupling agent solution comprises a cationic silane coupling agent, organic alcohol and water, wherein the mass ratio of the cationic silane coupling agent to the organic alcohol to the water is 10 (15-20) (70-75), and the cationic silane coupling agent is C 12-C18 alkyl cationic silane coupling agent. Further, in the preparation method of the silane coupling agent modified magnesium lithium silicate, the mass ratio of the cationic silane coupling agent to the magnesium lithium silicate serving as the raw materials is (5-25) 100. Further, the C 12-C18 alkyl cationic silane coupling agent is at least one of 3- (triethoxysilyl) propyl dimethyl dodecyl ammonium chloride and 3- (triethoxysilyl) propyl dimethyl octadecyl ammonium chloride. Further, the solvent is at least one of polyethylene glycol 200, polyethylene glycol 400 and ethylene glycol diethyl ester, the surfactant is at least one of fatty alcohol polyoxyethylene ether and fluorocarbon surfactant, and the polyacrylamide and