钻井液与完井液2024，Vol.41Issue(2)：148-154,7.DOI:10.12358/j.issn.1001-5620.2024.02.002
抗超高温220℃聚合物水基钻井液技术
A Polymer Water Based Drilling Fluid for 220℃ Bottomhole Temperature
摘要
Abstract
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 high-temperature 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.关键词
水基钻井液/抗高温/抗高矿化度/聚合物/深部地层Key words
Water-based drilling fluids/High temperature resistant/High salinity resistant/Polymer/Deep formation分类
能源科技引用本文复制引用
刘锋报,孙金声,刘敬平,黄贤斌,孟旭..抗超高温220℃聚合物水基钻井液技术[J].钻井液与完井液,2024,41(2):148-154,7.基金项目
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). （52288101）
