摘要
我国深层油气资源丰富,其高效开发对保障国家能源安全具有重大意义。钻井液是深部地层钻探的关键,但目前常规聚合物钻井液的抗温能力普遍低于220℃,且盐会大幅降低钻井液性能,钻探过程中往往由于钻井液失效引发安全事故,对深层油气开发造成重大损失。针对钻井液高温高盐条件下性能恶化的难题,合成了具有协同作用的抗高温两性离子聚合物和抗高温阴离子聚合物,通过高强度的网架结构调控钻井液流变性;合成抗超高温高效封堵剂来提高钻井液封堵性能和滤失性能,封堵泥饼和砂床,阻止压力传递。以抗高温两性离子聚合物、抗高温阴离子聚合物和抗超高温高效封堵剂为核心处理剂,构建了一套抗超高温220℃的聚合物水基钻井液体系,并评价了该钻井液的性能。实验结果表明,该钻井液具有良好的流变滤失性、沉降稳定性、封堵性和润滑性,其高温高压滤失量仅为9.6 mL,高温高压下仍保持黏度和切力稳定,直立老化72 h沉降因子仅为0.5113,砂床侵入深度仅为6 mm,老化后润滑系数和泥饼黏滞系数分别为0.1224和0.0875。该钻井液具有良好的抗温性能和稳定性,对深部油气的开发具有重要意义。
The efficient development of the abundant deep oil and gas boasted by China is of great significance for ensuring the national energy security.The regular polymer drilling fluids presently used generally have temperature resistance of less than 220℃.Salts,which are commonly used in formulating water-based drilling fluids,greatly damage the performance of the fluids.Deterioration of the properties of a drilling fluid during drilling causes downhole accidents and economic losses to the development of deep oil and gas.To deal with the deterioration of the properties of drilling fluid at high temperatures and high salinities,a high temperature zwitterionic polymer and a high temperature anionic polymer are synthesized.The two polymers have synergistic effect,and control and adjust mud rheology through high-strength network structures.To improve the plugging performance and filtration control property of a drilling fluid,an ultrahigh temperature high efficiency plugging agent is developed to plug pores in the formation,thereby stopping the transmission of pressure across the borehole wall.A water-based polymer drilling fluid is formulated with these three core additives to work in ultra-high temperature(220℃)environment.Laboratory evaluation of the performance of this drilling fluid shows that it has good rheology,filtration property,suspending capacity,plugging capacity and lubricity;the hightemperature high-pressure(HTHP)filtration rate is only 9.6 mL.The viscosity and gel strengths of the drilling fluid remains stable at HTHP,and the settling factor of the drilling fluid after being aged for 72 hours is only 0.5113 in testing with the test cell in an upright position.In sand-bed test the depth at which the drilling fluid invades into the sand-bed is only 6 mm.The friction coefficient of the drilling fluid after being aged and the mud cake frictional coefficient are 0.1224 and 0.0875,respectively.This drilling fluid has good high temperature resistance and stability,and is of great importance to the development of deep oil and gas development.
作者
刘锋报
孙金声
刘敬平
黄贤斌
孟旭
LIU Fengbao;SUN Jinsheng;LIU Jingping;HUANG Xianbin;MENG Xu(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580;PetroChina Tarim Oilfield Branch,Korla,Xinjiang 841000)
出处
《钻井液与完井液》
CAS
北大核心
2024年第2期148-154,共7页
Drilling Fluid & Completion Fluid
基金
国家自然科学基金基础科学中心项目“超深特深层油气钻采流动调控”(52288101)。
关键词
水基钻井液
抗高温
抗高矿化度
聚合物
深部地层
Water-based drilling fluids
High temperature resistant
High salinity resistant
Polymer
Deep formation
作者简介
第一作者:刘锋报,高级工程师,在读博士研究生,1985年生,毕业于中国地质大学(北京)化学工程专业,目前从事深井钻完井液技术研究与管理工作。E-mail:liufengbao100@126.com。
