克依构造带保护气藏的钻井液完井液试验研究  

Experimental study on gas reservoir protection of drilling/completion fluid for KeYi structural zone

作　　者：李天太[1] 徐自强[1] 张喜凤[1] 董悦[1] 杜小勇[2] 许世军[2] 

机构地区：[1]西安石油大学石油工程学院 [2]中国石油塔里木油田公司

出　　处：《钻井液与完井液》2005年第5期13-16,19,共5页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金重点资助项目(复杂条件下钻井技术基础研究;NO:50234030)部分研究成果

摘　　要：针对克依构造带气藏主要伤害因素是固相和液相侵入造成的水锁、水敏、固相堵塞伤害的特点,进行了保护储层钻井液性能和配方试验研究。通过试验,确定了克依构造带屏蔽暂堵粒子最佳尺寸分布范围为2.5~10μm和1~4μm;确定了滤液中Cl-的合理含量为:克拉区块应大于57200 mg/L,依南区块应大于18000 mg/L。通过聚磺欠饱和盐水钻井液体系与配方评价试验,优选出了适合于克依构造带气藏的钻井完井液体系与配方如下。①克拉区块:3%膨润土+0.1%PAC-HV+6%SMP-1+5%SPNH+3%FT-1+3%YL-100+1%MHR-86+2%多元醇+12%KCl+0.5%K2SiO3+0.3%NaOH+0.3%ABSN+2%超细碳酸钙+2%XC-2+加重剂(BGH∶重晶石=1∶1);②依南区块:3%膨润土+0.15%PAC-HV+4%SMP-1+3%SPC+3%PSC+2%FT-1+1%MHR-86+2%多元醇+3.5%KCl+0.5%K2SiO3+0.15%NaOH+0.3%ABSN+3%超细碳酸钙+(1%~3%)碳酸钙粉+加重剂(BGH∶重晶石=1∶1)。经试验验证,优选出的钻井液能够防止固相颗粒和液相沿大喉道深层侵入而造成固相堵塞和水锁;具有较强的抗盐、抗钙能力;各项性能满足钻井完井工程的要求。Water shutoff,water sensitive,solid plugging due to solid and liquid invasion are the major damage factors in KeYi structural zone.To solve these problem,a series of experimental study on formulation and properties of drilling fluid for reservoir protection were conducted.Laboratory showed that shielding-temporary plugging solids′size distribution should be 2.5～10 μm and 1～4 μm.And the rational concentration of Cl^-in filtration should be: more than 57200 mg/L in KeLa block;more than 18000 mg/L in YiNan block. The polysulfonate undersaturated brine drilling/ completion fluid system for the gas reservoir in KeYi structural zone was optimized through evaluation tests,and formulations were as followed: ① KeYi block: 3%bentonite+0.1%PAC-HV+6%SMP-1+5%SPNH+3%FT-1+3%YL-100+1%MHR-86+2%polyatomic alcohol+12%KCl+0.5%K_2SiO_3+0.3%NaOH+0.3%ABSN+2%ultrafine CaCO_3+2%XC-2+heavy weight additive(BGH∶barite= 1∶1);② YiNan block: 3%bentonite+ 0.15%PAC-HV+ 4%SMP-1+ 3%SPC+ 3%PSC+ 2%FT-1+ 1%MHR-86+ 2%polyatomic alcohol+ 3.5%KCl+ 0.5%K_2SiO_3+ 0.15%NaOH+ 0.3%ABSN+ 3%ultrafine CaCO_3+(1%~ 3%) CaCO_3 powder+ heavy weight additive(BGH∶barite=1∶1).By laboratory tests,drilling fluids performances can meet the operations of drilling and completion.

关 键 词：气藏 防止地层损害 钻井完井液 临时性封堵 聚磺欠饱和盐水钻井液 多元醇 水锁 水敏 克依构造带 

分 类 号：TE254.3[石油与天然气工程—油气井工程]