首页|A micro-crosslinked amphoteric hydrophobic association copolymer as high temperature-and salt-resistance fluid loss reducer for water-based drilling fluids

A micro-crosslinked amphoteric hydrophobic association copolymer as high temperature-and salt-resistance fluid loss reducer for water-based drilling fluids

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During ultradeep oil and gas drilling,fluid loss reducers are highly important for water-based drilling fluids,while preparing high temperature-and salt-resistance fluid loss reducers with excellent rheology and filtration performance remains a challenge.Herein,a micro-crosslinked amphoteric hydrophobic association copolymer(i.e.,DADC)was synthesized using N,N-dimethyl acrylamide,diallyl dimethyl ammonium chloride,2-acrylamido-2-methylpropane sulfonic acid,hydrophobic monomer,and pen-taerythritol triallyl ether crosslinker.Due to the synergistic effects of hydrogen bonds,electrostatic interaction,hydrophobic association,and micro-crosslinking,the DADC copolymer exhibited outstanding temperature-and salt-resistance.The rheological experiments have shown that the DADC copolymer had excellent shear dilution performance and a certain degree of salt-responsive viscosity-increasing per-formance.The DADC copolymer could effectively adsorb on the surface of bentonite particles through electrostatic interaction and hydrogen bonds,which bring more negative charge to the bentonite,thus improving the hydration and dispersion of bentonite particles as well as the colloidal stability of the drilling fluids.Moreover,the drilling fluids constructed based on the DADC copolymer exhibited satis-factory rheological and filtration properties(FLHTHP=12 mL)after aging at high temperatures(up to 200 ℃)and high salinity(saturated salt)environments.Therefore,this work provided new insights into designing and fabricating high-performance drilling fluid treatment agents,demonstrating good po-tential applications in deep and ultradeep drilling engineering.

Fluid loss reducerTemperature-and salt-resistanceHydrophobic associationAmphotericMicro-crosslinking

Jian Li、Yu-Xi Ji、Xiao-Xiao Ni、Kai-He Lv、Xian-Bin Huang、Jin-Sheng Sun

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School of Petroleum Engineering,China University of Petroleum (East China),Qingdao,266580,Shandong,China

Key Laboratory of Unconventional Oil & Gas Development,China University of Petroleum (East China),Qingdao,266580,Shandong,China

Inspection and Testing Center of Huabei Oil Field Company,PetroChina,Renqiu,062552,Hebei,China

Drilling Fluid Research Institute,CNPC Engineering Technology R&D Company Limited,Beijing,102206,China

School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,266580,Shandong,China

Key Laboratory of Unconventional Oil & Gas Development,China University of Petroleum(East China),Qingdao,266580,Shandong,China

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National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationPostdoctoral Innovation Talent Support of Shandong Province

522040232022M713465SDBX2022033

2024

石油科学(英文版)
中国石油大学(北京)

石油科学(英文版)

EI
影响因子:0.88
ISSN:1672-5107
年,卷(期):2024.21(3)