PFL系列超高温聚合物降滤失剂在徐闻X3井的应用

Application of PFL Series Ultra-High Temperature Polymer Filtrate Reducer in Xuwen X3 Well

田璐李胜杨小华王琳王治法

TIAN Lu LI Sheng YANG Xiao-Hua WANG Lin WANG Zhi-Fa

PFL系列聚合物降滤失荆具有黏度低、耐温抗盐降滤失效果显著等特点。质量分数为1％的PFL-L、PFL-H水溶液的表观黏度分别为12mPa·s和26mPa·8。在240℃滚动老化16h情况下，加有5％PFL—L的盐水泥浆（4％膨润土浆＋36％NaCl）的滤失量由226mL（空白样）降至32mL；加有4％PFL．H的盐水泥浆的滤失量由226mL（空白样）降至8．2mL；加有1．5％PFL-H的淡水泥浆（4％膨润土浆）的滤失量为由100mL（空白样）降为9．6mL。以PFL系列超高温聚合物降滤失剂为主，结合磺化类降滤失剂、抑制剂、防塌剂、稀释剂，形成了抗200℃强抑制盐水及淡水钻井液体系。现场应用表明，PFL系列超高温聚合物降滤失剂抗高温能力强，降滤失效果显著，确保井深5974m、电测温度为211℃的徐闻x3井顺利钻至井深6010m。表5参4

PFL series polymer filtrate reducer is characterized of low viscosity,good capacities of depressing the filter loss,heat resistance and salt tolerance.The apparent viscosity of 1% PFL-L aqueous solution and 1% PFL-H aqueous solution were 12 mPa · s and 26 mPa · s,respectively.After aging at 240℃/16 h,with the addition of 5%PFL-L,the filer loss(FL) of the saturated salt water mud(SSWM),composed of 4% bentonite and 36% NaCl,decreased from 226 mL(blank group) to 32 mL;with the addition of 4%PFL-H,the FL of the SSWM decreased from 226 mL(blank group)to 8.2 mL;with the addition of 1.5% PFL-H,the FL of fresh water mud,composed of 4% bentonite,decreased from 100 mL(blank goup)to 9.6 mL.Based on the PFL series ultra-high temperature polymer filtrate reducer and the optimized sulfonating filtrate reducer,inhibitor,lubricant,thinner,the strong inhibited brine and fresh drilling fluids,which were heat resistant to 200℃,were formed.The field application manifested that the PFL series ultra-high temperature polymer filtrate reducer showed strong heat resistance and good capacities of depressing the filter loss,making sure that the Xuwen X3 well was drilled to 6010 m and the logging temperature of 211℃ at the depth 5974 m.