微粉重晶石改善钻井液性能室内研究  

Laboratory Study on Improvement of Drilling Fluid Performance by Micro Powder Barite

作　　者：王建华 季一辉[2] 张忠民[3] 闫丽丽 王立辉 冯杰 李爽 

机构地区：[1]中国石油集团钻井工程技术研究院 [2]中国石油大学(北京)石油工程学院 [3]中国石油勘探开发研究院油田化学所

出　　处：《钻井液与完井液》2014年第4期23-25,96,共3页Drilling Fluid & Completion Fluid

基　　金：国家高技术研究发展计划(863计划)课题"海上大位移井钻井液关键技术研究"(2012AA091502)

摘　　要：为了改善钻井液的流变性和沉降稳定性,制备出了粒径(D90)小于5μm的微粉重晶石。分别在大位移水基钻井液和深井油基钻井液配方中进行了性能评价,室内实验结果表明,与API重晶石加重钻井液相比,用微粉重晶石和API重晶石混合加重的水基钻井液和油基钻井液塑性黏度更低,动切力更大,能明显降低钻井液当量循环压耗,在水基钻井液中极压润滑系数能降低8%以上,用其加重的高密度油基钻井液具有更好的沉降稳定性。因此,微粉重晶石是大位移井和高温高压深井理想的加重材料。A barite having D90 of less than 5 μm(micro powder barite) was developed to improve the rheology and sedimentation stability of drilling fluid. Laboratory study shows that water base and oil base drilling fluids treated with mixed micro powder barite and API barite have lower plastic viscosity and higher yield point than that of the drilling fluids treated with API barite only. The micro powder barite treated drilling fluids remarkably reduces the equivalent circulation pressure loss. Water base drilling fluid treated with micro powder barite has extreme pressure friction coefficient reduced by more than 8%, and oil base drilling fluid treated with micro powder barite has an improved sedimentation stability. Micro powder barite is an ideal weighting agent for use in extended reach horizontal well and HTHP well.

关 键 词：微粉重晶石 流变性 沉降稳定性 高密度钻井液 

分 类 号：TE254.4[石油与天然气工程—油气井工程]