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CN-117903764-B - Anti-collapse agent for drilling fluid and preparation method and application thereof

CN117903764BCN 117903764 BCN117903764 BCN 117903764BCN-117903764-B

Abstract

The invention discloses an anti-collapse agent for drilling fluid, a preparation method and application thereof, the collapse preventing agent comprises melamine, formaldehyde aqueous solution, organic phosphonate, dilute sulfuric acid, water, epoxy chloropropane and a solid acid catalyst. The preparation method of the anti-collapse agent comprises the steps of 1) uniformly mixing melamine, formaldehyde aqueous solution and water, regulating the pH value of the mixed solution to 8-9, heating to react to obtain a material flow A, 2) introducing dilute sulfuric acid into the material flow A to react to obtain a material flow B, 3) adding organic phosphonate, a solid acid catalyst and epoxy chloropropane into the material flow B, and separating and drying after the reaction is completed to obtain the anti-collapse agent. The anti-collapse agent for drilling fluid provided by the invention has good high temperature resistance, good salt resistance, temperature resistance, wall fixation and filtration reduction performance, can meet the anti-collapse wall fixation requirements of water-based slurry in drilling and production of complex well conditions such as deep wells, high bittern wells and the like, and prolongs the safe construction period.

Inventors

  • JIA WEIMING
  • WANG CHEN
  • YANG CHAO
  • SUN ZHENFENG
  • LI JIE

Assignees

  • 中国石油化工股份有限公司
  • 中石化（大连）石油化工研究院有限公司

Dates

Publication Date
20260505
Application Date
20221012

Claims (20)

  1. 1. The anti-collapse agent for the drilling fluid comprises the following raw materials in parts by weight: Melamine 12 parts 20-50 Parts of formaldehyde aqueous solution 10-20 Parts of organic phosphonate 2-12 Parts of sulfuric acid 50-200 Parts of water 2.5 To 16.5 parts of epichlorohydrin 0.05-1 Part of a solid acid catalyst; The preparation method of the anti-collapse agent for the drilling fluid comprises the following steps: (1) Under the mixing condition, uniformly mixing melamine, formaldehyde aqueous solution and water, regulating the pH value of the mixed solution to 8-9, and then heating to react to obtain a material flow A; (2) Introducing dilute sulfuric acid into the material flow A obtained in the step (1) under the reaction condition to react, and obtaining a material flow B after the reaction; (3) Under the reaction condition, adding organic phosphonate, a solid acid catalyst and epichlorohydrin into the material flow B obtained in the step (2), and separating and drying after the reaction is finished to obtain the anti-collapse agent.
  2. 2. The collapse preventing agent for drilling fluids according to claim 1, wherein the raw materials of the collapse preventing agent comprise the following components in parts by weight: Melamine 12 parts 28-36 Parts of formaldehyde aqueous solution 12-18 Parts of organic phosphonate 4-10 Parts of sulfuric acid 100-150 Parts of water 5.5 To 12.5 parts of epichlorohydrin 0.2-0.8 Parts of solid acid catalyst.
  3. 3. The anti-collapse agent for drilling fluids according to claim 1, wherein the concentration of the aqueous formaldehyde solution is 30wt% to 55wt%.
  4. 4. A collapse preventing agent for drilling fluids according to claim 1, wherein the aqueous formaldehyde solution is a 37% by weight aqueous technical grade formaldehyde solution.
  5. 5. The collapse preventing agent for drilling fluids according to claim 1, wherein the mass concentration of sulfuric acid is 30% -50%.
  6. 6. The collapse preventing agent for drilling fluids according to claim 1, wherein the mass concentration of sulfuric acid is 35% -45%.
  7. 7. The anti-collapse agent for drilling fluids according to claim 1, wherein the organic phosphonate is selected from one or more of sodium aminotrimethylene phosphonate, sodium ethylenediamine tetramethylene phosphonate, sodium diallylaminomethyl phosphonate, potassium diallylaminomethyl phosphonate, calcium diallylaminomethyl phosphonate, magnesium diallylaminomethyl phosphonate, sodium diethylenetriamine pentamethylene phosphonate.
  8. 8. The anti-collapse agent for drilling fluid according to claim 1, wherein the solid acid catalyst is a solid acid catalyst containing Lewis acid sites and is selected from one or more of bentonite, montmorillonite, alumina, titania, vanadic anhydride, molybdenum trioxide, aluminum chloride, cation exchange resin and Y-type molecular sieve.
  9. 9. The anti-collapse agent for drilling fluids according to claim 1, wherein when the solid acid catalyst is a cation exchange resin, the skeleton structure/matrix is one or more of styrene-based, acrylic-based, urea-formaldehyde-based, phenolic-based, epoxy-based or vinyl chloride-based, and when the solid acid catalyst is a Y-type molecular sieve, the solid acid catalyst is one or more of NaY, HY, USY molecular sieves.
  10. 10. The anti-collapse agent for drilling fluids according to claim 1, wherein the solid acid catalyst is a cation exchange resin, and wherein the skeleton structure/matrix is a styrene-based cation exchange resin, and wherein the solid acid catalyst is a Y-type molecular sieve.
  11. 11. A method of preparing an anti-collapse agent for drilling fluids as claimed in any one of claims 1 to 10, comprising the following: (1) Under the mixing condition, uniformly mixing melamine, formaldehyde aqueous solution and water, regulating the pH value of the mixed solution to 8-9, and then heating to react to obtain a material flow A; (2) Introducing dilute sulfuric acid into the material flow A obtained in the step (1) under the reaction condition to react, and obtaining a material flow B after the reaction; (3) Under the reaction condition, adding organic phosphonate, a solid acid catalyst and epichlorohydrin into the material flow B obtained in the step (2), and separating and drying after the reaction is finished to obtain the anti-collapse agent.
  12. 12. The method for preparing the anti-collapse agent for drilling fluid according to claim 11, wherein the anti-collapse agent comprises the following components in parts by weight, melamine, formaldehyde aqueous solution, organic phosphonate, dilute sulfuric acid, water, epichlorohydrin and solid acid catalyst, wherein the components comprise, by weight, 12 parts of melamine, 20-50 parts of formaldehyde, 10-20 parts of organic phosphonate, 2-12 parts of dilute sulfuric acid, 50-200 parts of water, 2.5-16.5 parts of epichlorohydrin and 0.05-1 part of solid acid catalyst.
  13. 13. The method for preparing the anti-collapse agent for drilling fluid according to claim 11, wherein the anti-collapse agent comprises the following components in parts by weight, melamine, formaldehyde aqueous solution, organic phosphonate, dilute sulfuric acid, water, epichlorohydrin and solid acid catalyst, wherein the components comprise, by weight, 12 parts of melamine, 28-36 parts of formaldehyde, 12-18 parts of organic phosphonate, 4-10 parts of dilute sulfuric acid, 100-150 parts of water, 5.5-12.5 parts of epichlorohydrin and 0.2-0.8 part of solid acid catalyst.
  14. 14. The method for preparing the anti-collapse agent for drilling fluid according to claim 11, wherein the reaction condition in the step (1) is that the reaction temperature is 70-90 ℃ and the reaction time is 0.5-6 h.
  15. 15. The method for preparing the anti-collapse agent for drilling fluid according to claim 11, wherein the pH value of the mixed solution regulated and controlled in the step (1) is 8-9, alkali liquor is added for regulation and control, the alkali liquor is at least one selected from sodium hydroxide and potassium hydroxide, and the concentration of the alkali liquor is 2-5 mol/L.
  16. 16. The method for preparing an anti-collapse agent for drilling fluid according to claim 11, wherein the reaction conditions in the step (2) are as follows, the reaction temperature is 50-80 ℃, and the reaction time is 0.5-6 h.
  17. 17. The method for producing an anti-collapse agent for drilling fluids according to claim 11, wherein the reaction temperature in the step (2) is 10 to 30 ℃ lower than the reaction temperature in the step (1).
  18. 18. The method for producing an anti-collapse agent for drilling fluids according to claim 11, wherein the reaction temperature in the step (2) is 15 to 25 ℃ lower than the reaction temperature in the step (1).
  19. 19. The method for preparing a collapse preventing agent for drilling fluids according to claim 11, wherein the mass concentration of dilute sulfuric acid in the step (2) is 30% -50%.
  20. 20. The method for preparing a collapse preventing agent for drilling fluids according to claim 11, wherein the mass concentration of dilute sulfuric acid in the step (2) is 35% -45%.

Description

Anti-collapse agent for drilling fluid and preparation method and application thereof Technical Field The invention relates to the field of oil field exploration and development, in particular to an anti-collapse agent for drilling fluid, a preparation method and application thereof. Background At present, along with the acceleration of the development process of oil and gas exploration, the number of complex wells such as deep wells, ultra-deep wells and the like is increased, and the problems of lost circulation, collapse, diameter shrinkage, well wall instability and the like in the process of drilling complex stratum are urgently solved. The high-performance collapse-preventing wall-fixing agent is a key for improving the stability of a well wall, reducing complex well conditions and prolonging the safe construction period. At present, researchers develop a great deal of research around the high-performance anti-collapse wall-fixing agent, and report on the preparation and application of the anti-collapse wall-fixing agent with different working mechanisms. Patent CN104151493A discloses that N-vinyl pyrrolidone, (3-methacrylamide) propyl trimethyl ammonium chloride is used as a polymerization monomer, and an emulsion type anti-collapse agent with high molecular weight and good water solubility is obtained by an inverse emulsion method. CN 108456286A uses acrylic ester monomer and acrylic acid as main raw materials, the anti-collapse agent prepared by dispersion polymerization method has good adhesive property to rock particles of well wall, can effectively improve the strength of well wall, and CN 108485613A discloses a preparation method of white asphalt anti-collapse agent, which uses paraffin, stearic acid, glyceryl tristearate, fatty alcohol polyoxyethylene ether, polyethylene glycol monomethyl ether methacrylate, nano calcium carbonate and sodium carboxymethyl cellulose as raw materials, and obtains low fluorescence white asphalt by spray granulation, and has good high temperature high pressure drop and filtration performance. In combination with the analysis of the prior art, the prior art discloses a preparation method and application of different types of anti-collapse wall fixing agents, which respectively aim at improving the viscosity of drilling fluid, optimizing the quality of mud cakes, reducing the leakage of filtrate into stratum, reducing the activity of water, coating, inhibiting hydration expansion of clay, slowing down slurry making and peeling off, blocking hydration channels, slowing down pressure transmission, keeping the stability of a well wall and other different angles, achieve a certain effect, and pay attention to the dispersion performance, environmental protection performance, high temperature resistance and fluorescence performance of the water-based drilling fluid anti-collapse wall fixing agent so as to meet the requirements of well wall stability and logging in the drilling and production process of deep wells and complex wells. However, the prior art has little attention on the salt resistance and the calcium resistance of the collapse-preventing wall-fixing agent, and the research on the high-temperature high-bittern reservoir well wall stabilization collapse-preventing agent is still in depth. Disclosure of Invention Aiming at the defects of the prior art, the invention mainly aims to provide the anti-collapse agent for the drilling fluid, and the preparation method and the application thereof, wherein the anti-collapse agent takes melamine resin as a framework, and has the advantages of good salt resistance, temperature resistance, wall fixation, filtration loss reduction performance, environmental protection, low fluorescence, good water solubility and the like. The technical scheme of the invention mainly comprises the following aspects: 1. The invention provides an anti-collapse agent for drilling fluid, which comprises the following raw materials in parts by weight: Melamine 12 parts 20-50 Parts of formaldehyde aqueous solution 10-20 Parts of organic phosphonate 2-12 Parts of sulfuric acid 50-200 Parts of water 2.5 To 16.5 parts of epichlorohydrin 0.05-1 Part of solid acid catalyst. Further preferably, the anti-collapse agent comprises the following raw materials in parts by weight: Melamine 12 parts 28-36 Parts of formaldehyde aqueous solution 12-18 Parts of organic phosphonate 4-10 Parts of sulfuric acid 100-150 Parts of water 5.5 To 12.5 parts of epichlorohydrin 0.2-0.8 Parts of solid acid catalyst. Further, according to an embodiment of the present invention, the concentration of the aqueous formaldehyde solution is 30wt% to 55wt%, specifically, the concentration of the aqueous formaldehyde solution may be 37wt%,44wt%, 50wt%, and more preferably, the concentration of the aqueous formaldehyde solution is 37wt% of the technical grade aqueous formaldehyde solution. Further, according to one embodiment of the present invention, the sulfuric acid is dilute sulfu