塔里木油田跃满西区块高温恒流变钻井液研究与现场试验  

Study and Field Test of Drilling Fluid with Constant Rheology at High Temperature in West Yueman Block,Tarim Oilfield

作　　者：舒义勇 孙俊 曾东 徐思旭 周华安 席云飞 SHU Yiyong;SUN Jun;ZENG Dong;XU Sixu;ZHOU Huaan;XI Yunfei(Xinjiang Branch of CNPC Chuanqing Drilling Engineering Company Limited,Korla,Xinjiang,841000,China;Drilling Fluid Technical Service Company of CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan,610051,China)

机构地区：[1]中国石油集团川庆钻探工程有限公司新疆分公司,新疆库尔勒841000 [2]中国石油集团川庆钻探工程有限公司钻井液技术服务公司,四川成都610051

出　　处：《石油钻探技术》2021年第5期39-45,共7页Petroleum Drilling Techniques

摘　　要：塔里木油田跃满西区块深部地层钻井液安全密度窗口窄,易出现井漏、井塌、卡钻和盐水侵等井下复杂情况,目前所用钻井液存在高温增稠、抗CO_(3)^(2–)/HCO_(3)^(–)和劣质土污染能力差等问题。为解决这些问题,研究了以抗高温聚合物降滤失剂APS220和新型高温稳定剂HTS220为主剂的高温恒流变钻井液,在试验分析主要试剂性能的基础上确定了基本配方。通过室内试验,评价了该钻井液的高温恒流变性、抗CO_(3)^(2–)/HCO_(3)^(–)污染性能和抗钠膨润土污染性能,试验发现,其100与180℃时的塑性黏度比值为1.3,动切力比值为1.5,初切力比值为1.7,终切力比值为1.2,随温度升高各流变参数的变化幅度明显低于常用钻井液,可抗2.0%的CO_(3)^(2–)/HCO_(3)^(–)复合污染、10.0%的钠膨润土污染。高温恒流变钻井液在跃满西区块2口井现场试验中,流变性能稳定,钻后井眼畅通,减少了井下复杂情况,取得了显著效果。Safe density window of drilling fluids in the deep formations of the West Yueman Block in Tarim Oilfield is narrow,and as a result,downhole complications such as lost circulation,well collapse,drill string sticking,and salt water contamination are frequently encountered.Some drawbacks exist in available drilling fluids including thickening at high temperature and a weak resistance to pollution by CO_(3)^(2–)/HCO_(3)^(–)and poor quality soil.In this paper,a drilling fluid with constant rheology at high temperature was studied,with a high-temperature-resistant polymer fluid loss additive(APS220)and a new high-temperature stabilizer(HTS220)as the base.The basic formula was determined on the basis of the performance analysis of the main agents.Laboratory tests were performed to evaluate the constant rheology at high temperature and the resistance to CO_(3)^(2–)/HCO_(3)^(–)and sodium bentonite pollution of the drilling fluid.The results showed that,the drilling fluid had a plastic viscosity ratio of 1.3,dynamic shear ratio of 1.5,initial shear ratio of 1.7 and final shear ratio of 1.2 at 100℃ and 180℃.As temperatures rose,it presented a variation range of rheological parameters significantly lower than that of other commonly used drilling fluids,with the resistance to pollution by 2%CO_(3)^(2–)/HCO_(3)^(–)and 10%sodium bentonite.In the field test of two wells in the West Yueman Block,the drilling fluid demonstrated stable rheological properties,with smooth drilled borehole and considerable downhole complication reduction.

关 键 词：高温 稳定剂 聚合物降滤失剂 恒流变 钻井液 跃满西区块 塔里木油田 

分 类 号：TE254.3[石油与天然气工程—油气井工程]