高密度瓜胶压裂液体系的研究与应用　

Research and application of high density guar gum fracturing fluid system

崔会杰 余东合 李建平 车航 李玉涛 周汉

CUI Huijie YU Donghe LI Jianping CHE Hang LI Yutao ZHOU Han

中国石油华北油田公司，河北任丘　062552 中国石油渤海钻探井下作业公司，河北任丘　062552

Huabei Oilfield Co., PetroChina, Renqiu 062552, China Down Hole Operation Co., Bohai Drilling and Exploitation Company, Renqiu 062552, China

针对华北油田家29断块与岔71断块高压油气层压裂改造难度大的问题，室内优选出溴化钠与硝酸钠复配加重剂，研发了高密度压裂液体系。研究结果表明，该压裂液体系的密度1.20~1.55 g/cm3可调，160 ℃、170 s?1条件下剪切90 min后黏度大于100 mPa·s。在华北油田进行了4口井的现场应用，与普通压裂液相比，施工排量提高了1.0~1.5 m3/min，砂比提高了5~16个百分点，井口压力降低了7~15 MPa，压裂效果较同区块邻井显著提高。

High pressure oil and gas reservoir hydraulic fracturing is a difficult problem in Blocks J29 and C71 in Huabei oilfield. Aiming at this, a high density fracturing fluid system was developed by choosing sodium bromide and sodium nitrate as mixed weighting agent. Research showed that the density of this fracturing fluid can adjust between 1.20~1.55 g/cm3; And its viscosity is more than 100 mPa·s after 90 minites shearing under the conditions of temperature 160 ℃ and shear rate 170 s?1. 4 wells field application in Huabei oilfield has showed that, compared with common fracturing fluid, the construction output increases 1.0~1.5 m3/min with the high density fluid, and proppant concentration climbs 5~16 percentage point with the decresing of well head pressure in 7~15 MPa. The fracturing effect significantly improves compared with wells in adjacent block.