在石油鉆采方面，高粘度HEC主要用作完井液和整理液的增粘劑。低粘度HEC用作降濾失劑。在鉆井、完井、固井和壓裂操作所需的各種操作液中，HEC作為增稠劑使泥漿獲得良好的流動性和穩(wěn)定性。鉆井中可提高泥漿攜巖屑能力，延長鉆頭的使用壽命。在低固相鉆井、完井液中，HEC優(yōu)良的降失水性能可防止大量水份從操作液中滲入井壁，可提高井壁穩(wěn)定能力。

In oil dillig industrv,high-viscosity HEC is mainly used as viscosifier in well-completing orfinishing fluid; while low-viscosity HEC is mainly used as water loss controller. HEC usedasthickener will impart good mobility and stability to various slurries necessary for driling.completion, cementing and fracturing operations. In drilling. HEC can increase the sand carryingcapability of the slurry and extend the service life of drll bits Inlow-solid content completionfluidand cementing fluid, the excellent water loss control performance of HEC canprevent largeamount of water in the slurry from entering into the oill reservoir and enhancing the stabilizingcapability of the wallofthe reservoir.