高原冻土区低固相成膜剂钻井液配方优选  

Optimization of drilling fluid formula with low solid film forming agent in plateau frozen soil area

作　　者：张雨晨 郝树青[1,2] 杜欣齐 ZHANG Yu-chen;HAO Shu-qing;DU Xin-qi(Schoool of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of CBM Reservoir Formation Process of Ministry of Education,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221008

出　　处：《应用化工》2023年第7期1950-1953,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目资助(51674240);中国矿业大学重大项目培育专项(重点)(2020ZDPYZD03)。

摘　　要：为解决在高原冻土层实施钻井勘探中出现井壁失稳坍塌及钻井液对储层侵害等问题,以氯化钠为抗冻剂、硅酸钠为成膜剂采用正交实验法进行室内实验,最终在多组钻井液配方中优选出两组抗低温成膜剂钻井液配方。在-5℃下使用的配方Z1(清水+15%NaCl+2.5%Na膨润土+1.5%Na-HPAN+0.3%XG+2%硅酸钠),在-10℃下使用的配方Z2(清水+20%NaCl+3.0%Na膨润土+1.5%Na-HPAN+0.4%XG+1.5%硅酸钠)。其主要性能指标是:AV值12.0,16.5 mPa·s;PV值9.0,13.0 mPa·s;YP值3.1,3.6 Pa;FL API值6.5 mL/30 min,6.3 mL/30 min。经对两组钻井液的流变参数测定及滤饼质量观测,两组配方均具有较好的流变性能并能形成致密有韧性的半透膜,故两组钻井液配方都满足在高原冻土层钻井勘探的使用要求。In order to solve the problems of wellbore instability and collapse and reservoir damage caused by drilling fluid during drilling exploration in plateau frozen soil,indoor tests were conducted by orthogonal test method with sodium chloride as antifreeze and sodium silicate as film-forming agent,and finally two groups of low-temperature resistant film-forming agent drilling fluid formulas were selected from multiple groups of drilling fluid formulas.The formula Z1(water+15%NaCl+2.5%Na bentonite+1.5%Na-HPAN+0.3%XG+2%sodium silicate),which could be used in the temperature of-5℃,and the formula Z2(water+20%NaCl+3.0%Na bentonite+1.5%Na-HPAN+0.4%XG+1.5%sodium silicate),which could be used in the temperature of-10℃.The main indicators are:AV values are 12.0 mPa·s and 16.5 mPa·s,PV values are 9.0 mPa·s and 13.0 mPa·s,YP values are 3.1 Pa and 3.6 Pa,and FL API values are 6.5 mL/30 min and 6.3 mL/30 min.According to the measurement of rheological parameters of the two groups of drilling fluids and the observation of mud cakes quality,it is found that the two groups of drilling fluids have better rheological properties and can form a dense and tough semi-permeable membrane,therefore,the two groups of drilling fluid formulas can suitable the requirements of drilling and exploration in plateau frozen soil.

关 键 词：高原冻土 低温钻井液 正交实验 流变性能 滤饼质量 

分 类 号：TQ177.4[化学工程—硅酸盐工业] TE254[石油与天然气工程—油气井工程]