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CN-122012044-A - Temperature-resistant salt-resistant long-acting low-friction-resistance continuous oil pipe drilling and grinding liquid and preparation method thereof

CN122012044ACN 122012044 ACN122012044 ACN 122012044ACN-122012044-A

Abstract

The invention provides a temperature-resistant, salt-resistant, long-acting and low-friction-resistance continuous oil pipe drilling and grinding liquid and a preparation method thereof, wherein the method comprises the steps of preparing a thickening agent for drilling and grinding and a shearing-resistant reinforcing agent according to a proportion to obtain the drilling and grinding liquid; wherein the mass fraction of the thickening agent for drilling and grinding is 0.05-0.3%, the mass fraction of the shear-resistant reinforcing agent is 0.1-0.6%, and the balance is solvent water. According to the invention, the preparation of the drilling and grinding fluid realizes temperature resistance and salt resistance by precisely controlling intermolecular supermolecule acting force by adding the compound supermolecule acting monomer in a specific proportion, and realizes long-acting shearing resistance of the drilling and grinding fluid by forward synergistic effect of the compound supermolecule acting monomer and the specific surfactant along with the change of shearing strength, thereby having the effects of temperature resistance, salt resistance, long-acting and low friction resistance.

Inventors

  • BAO JIN
  • XU TINGTING
  • GUAN BIN
  • LU XIUDE
  • LU LI
  • LI YUANYUAN
  • MENG ZHAOHAI
  • LIU ZHIYAO
  • ZHANG ZHAOYANG
  • WANG DINGLI

Assignees

  • 中国石油天然气集团有限公司
  • 中国石油集团川庆钻探工程有限公司

Dates

Publication Date
20260512
Application Date
20241108

Claims (12)

  1. 1. The preparation method of the temperature-resistant, salt-resistant and long-acting low-friction continuous oil pipe drilling and grinding fluid is characterized by comprising the following steps of: preparing a thickening agent for drilling and grinding and a shearing-resistant reinforcing agent according to a proportion to obtain drilling and grinding liquid, The weight percentage of the thickening agent for drilling and grinding is 0.05-0.3%, the weight percentage of the shearing-resistant reinforcing agent is 0.1-0.6%, and the balance is solvent water.
  2. 2. The method of claim 1, wherein the drilling and grinding thickener is a quaternary polymer prepared from a plurality of monomers by a staged initiation process.
  3. 3. The method of preparing a drilling and grinding fluid according to claim 2, wherein the plurality of monomers includes hydrophilic monomers, anionic monomers and supermolecular monomers.
  4. 4. The method for preparing a drilling and grinding fluid according to claim 3, wherein the hydrophilic monomer comprises acrylamide, and the mass fraction of the hydrophilic monomer is 63.5% -68.5% of the total mass of the monomers.
  5. 5. The method for preparing a drilling and grinding fluid according to claim 3, wherein the anionic monomers comprise sodium acrylate and 2-acrylamide-2-methylpropanesulfonic acid, and the mass percentages of the total mass of the monomers are 24.5% -26.0% and 5.0% -7.0%, respectively.
  6. 6. The method for preparing a drilling and grinding fluid according to claim 3, wherein the supermolecular acting monomer comprises a mixture of cetyl dimethyl allyl ammonium chloride and stearyl dimethyl allyl ammonium chloride mixed according to a mass ratio of 4:1, and the mass fraction of the supermolecular acting monomer is 3.5% -6.5% of the total mass of the monomers.
  7. 7. The method for preparing drilling and grinding fluid according to claim 2, wherein the composition system of the stage initiating process comprises: The azo initiator is azobisisobutylammonium hydrochloride, the dosage is 0.02% -0.035% of the total mass of the plurality of monomers, the redox initiator comprises sodium hypophosphite, sodium metabisulfite and sodium persulfate, and the dosage is 0.02% -0.035%, 0.005% -0.015% and 0.015% -0.03% of the total mass of the plurality of monomers respectively.
  8. 8. The method for preparing the drilling and grinding fluid according to claim 2, wherein the method for preparing the thickening agent for drilling and grinding comprises the following steps: Adding the multiple monomers into a reactor according to a proportion, adding urea with the dosage of 5.5-12% of the total mass of the multiple monomers, adding sodium hypophosphite, adding azo initiator, adding pure water to be fully dissolved into an aqueous solution with the mass fraction of 26-29.5% of the total monomer, and adjusting the pH value to 6.95-7.35. Controlling the reactor to 19-21 ℃, and introducing inert gas to deoxidize; Adding an oxidation-reduction reaction initiator; Continuously introducing inert gas until the inert gas can not be introduced; Preserving heat and then starting to form colloidal particles; adding sodium hydroxide aqueous solution with the mass of 2.5% -5% of the colloidal particle, uniformly mixing, and hydrolyzing at the temperature of 85-95 ℃; And drying, pulverizing, and sieving to obtain the thickening agent for drilling and grinding.
  9. 9. The method for preparing the drilling and grinding fluid according to claim 8, wherein the inert gas comprises nitrogen or inert gas, and the time for introducing the inert gas to deoxidize is 35-65 min.
  10. 10. The method for preparing a drilling and grinding fluid according to claim 8, wherein the heat preservation time is 3.5-4.5 hours, and the hydrolysis time is 1.5-2.5 hours.
  11. 11. The method for preparing the drilling and grinding fluid according to claim 1, wherein the shear strength enhancer is prepared by uniformly mixing 50% of an alkyl glycoside APG1214 aqueous solution and 50% of an alkyl glycoside APG1216 aqueous solution according to a mass ratio of 2:1-2.5:1.
  12. 12. A temperature-resistant, salt-resistant, long-acting, low-friction continuous oil pipe drilling and grinding fluid, which is characterized in that the drilling and grinding fluid is prepared by the method of any one of claims 1-11.

Description

Temperature-resistant salt-resistant long-acting low-friction-resistance continuous oil pipe drilling and grinding liquid and preparation method thereof Technical Field The invention relates to the technical field of petroleum engineering, in particular to a temperature-resistant salt-resistant long-acting low-friction-resistance continuous oil pipe drilling and grinding liquid and a preparation method thereof. Background The existing deep shale gas drilling and grinding fluid mainly has the problems that after long-time recycling at high temperature, the resistance reducing effect is obviously reduced, the mineralization degree of the fluid, the content of metal ions and the like are increased due to repeated use of the working fluid, and even if the resistance reducing agent is added, the resistance reducing effect is still poor, so that the long-acting low-friction drilling and grinding fluid suitable for deep shale gas drilling and grinding needs to be developed. Disclosure of Invention The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the purposes of the invention is to provide a preparation method of a temperature-resistant, salt-resistant, long-acting and low-friction-resistance continuous oil pipe drilling and grinding liquid, and the other purpose of the invention is to provide a temperature-resistant, salt-resistant, long-acting and low-friction-resistance continuous oil pipe drilling and grinding liquid. In order to achieve the above purpose, the invention provides a preparation method of a temperature-resistant, salt-resistant, long-acting and low-friction continuous oil pipe drilling and grinding fluid, which comprises the following steps: The drilling and grinding fluid is prepared by proportionally preparing a thickening agent for drilling and grinding and a shearing-resistant reinforcing agent, wherein the mass fraction of the thickening agent for drilling and grinding is 0.05-0.3%, the mass fraction of the shearing-resistant reinforcing agent is 0.1-0.6%, and the balance is solvent water. Alternatively, the drilling and milling thickener is a quaternary polymer prepared from multiple monomers by a segmented initiation process. Alternatively, the plurality of monomers includes hydrophilic monomers, anionic monomers, and supermolecular acting monomers. Optionally, the hydrophilic monomer may include acrylamide, and the mass fraction of the hydrophilic monomer is 63.5% -68.5% of the total mass of the plurality of monomers. Optionally, the anionic monomer can comprise sodium acrylate and 2-acrylamide-2-methylpropanesulfonic acid, and the mass fractions of the anionic monomer and the monomer account for 24.5% -26.0% and 5.0% -7.0% of the total mass of the monomers respectively. Alternatively, the supermolecular acting monomer can comprise a mixture of hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride mixed according to a mass ratio of 4:1, and the mass fraction of the supermolecular acting monomer accounting for the total mass of the monomers is 3.5% -6.5%. Optionally, the composition system of the staged initiation process comprises: The azo initiator comprises azobisisobutylamin hydrochloride with the dosage of 0.02-0.035 percent of the total mass of the monomers, and the redox initiator comprises sodium hypophosphite, sodium metabisulfite and sodium persulfate with the dosage of 0.02-0.035 percent, 0.005-0.015 percent and 0.015-0.03 percent of the total mass of the monomers. Optionally, the preparation method of the thickener for drilling and grinding comprises the following steps: Adding the multiple monomers into a reactor according to a proportion, adding urea with the dosage of 5.5-12% of the total mass of the multiple monomers, adding sodium hypophosphite, adding azo initiator, adding pure water to be fully dissolved into an aqueous solution with the mass fraction of 26-29.5% of the total monomer, and adjusting the pH value to 6.95-7.35. Controlling the reactor to 19-21 ℃, and introducing inert gas to deoxidize; Adding an oxidation-reduction reaction initiator; Continuously introducing inert gas until the inert gas can not be introduced; Preserving heat and then starting to form colloidal particles; adding sodium hydroxide aqueous solution with the mass of 2.5% -5% of the colloidal particle, uniformly mixing, and hydrolyzing at the temperature of 85-95 ℃; And drying, pulverizing, and sieving to obtain the thickening agent for drilling and grinding. Optionally, the inert gas comprises nitrogen, and the time for introducing the inert gas to deoxidize is 35-65 min. Optionally, the heat preservation time is 3.5-4.5 hours, and the hydrolysis time is 1.5-2.5 hours. Optionally, the shear strength enhancer is prepared by uniformly mixing 50% of an alkyl glycoside APG1214 aqueous solution and 50% of an alkyl glycoside APG1216 aqueous solution according to a mass ratio of 2:1-2.5:1. T