Construction of coal pitch-based HA-K grafted poly condensates and their excellent anti-temperature and viscosity-reducing properties  

作　　者：Jing Tan Wei Zhang Xiu-Ling Yan Hao Zhou Sher Bahadar Khan Seitkhan Azat Shi-You Yan Hao-Jie Ma Xin-Tai Su 

机构地区：[1]Xinjiang Key Laboratory of Clean Conversion and High Value Utilization of Biomass Resources,College of Chemistry and Chemical Engineering,Yili Normal University,Yining,835000,Xinjiang,China [2]School of Environment and Energy,Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling,South China University of Technology,Guangzhou,510006,Guangdong,China [3]Drilling Fluid Branch of CNPC Xibu Drilling Engineering Company Limited,Karamay,830046,Xinjiang,China [4]Urumchi Huatailong Chemical Additives Co.,Ltd.,Urumqi,830000,Xinjiang,China [5]Department of Chemistry,Faculty of Science,King Abdulaziz University,PO Box 80203,Jeddah,21589,Saudi Arabia [6]Faculty of Chemistry and Chemical Technology,Al-Farabi Kazakh National University,Almaty,050013,Kazakhstan

出　　处：《Petroleum Science》2024年第4期2806-2816,共11页石油科学（英文版）

基　　金：supported by the Key R&D projects in Xinjiang (2022B01042);Research and Innovation Team Cultivation Plan of Yili Normal University (#CXZK2021002)。

摘　　要：Humic acids(HAs)are widely used as filtrate and viscosity reducers in drilling fluids.However,their practical utility is limited due to poor stability in salt resistance and high-temperature resistance.Hightemperature coal pitch(CP)is a by-product from coal pyrolysis above 650℃.The substance's molecular structure is characterized by a dense arrangement of aromatic hydrocarbon and alkyl substituents.This unique structure gives it unique chemical properties and excellent drilling performance,surpassing traditional humic acids in drilling operations.Potassium humate is prepared from CP(CP-HA-K)by thermal catalysis.A new type of high-quality humic acid temperature-resistant viscosity-reducer(Graft CP-HA-K polymer)is synthesized with CP-HA-K,hydrolyzed polyacrylonitrile sodium salt(Na-HPAN),urea,formaldehyde,phenol and acrylamide(AAM)as raw materials.The experimental results demonstrate that the most favorable conditions for the catalytic preparation of CP-HA-K are 1 wt%catalyst dosage,30 wt%KOH dosage,a reaction temperature of 250℃,and a reaction time of 2 h,resulting in a maximum yield of CP-HA-K of 39.58%.The temperature resistance of the Graft CP-HA-K polymer is measured to be 177.39℃,which is 55.39℃ higher than that of commercial HA-K.This is due to the abundant presence of amide,hydroxyl,and amine functional groups in the Graft CP-HA-K polymer,which increase the length of the carbon chains,enhance the electrostatic repulsion on the surface of solid particles.After being aged to 120℃ for a specified duration,the Graft CP-HA-K polymer demonstrates significantly higher viscosity reduction(42.12%)compared to commercial HA-K(C-HA-K).Furthermore,the Graft CP-HA-K polymer can tolerate a high salt concentration of 8000 mg.L-1,measured after the addition of optimum amount of 3 wt%Graft CP-HA-K polymer.The action mechanism of Graft CP-HA-K polymer on high-temperature drilling fluid is that the Graft CP-HA-K polymer can increase the repulsive force between solid particles and disrupt bentonite's reticulation stru

关 键 词：Viscosity breaker Heat resistance Base mud Graft CP-HA-K polymer CP Salt resistance 

分 类 号：TE254.4[石油与天然气工程—油气井工程]