冀东油田水平井钻井液体系的研究与应用

针对冀东油田水平井钻井液的技术难点，设计开发了无土相钻井液体系，体系配方为：海水＋0．1％NaOH＋0．15％Na2CO3＋0．7％增粘剂HVIS＋1．5％降滤失剂HFLO＋2％抑制剂HPA＋1％润滑剂HLB＋5％KCl＋5％暂堵剂QWY。研究结果表明，该体系具有很好的抑制性、抗温性、抗污染性、润滑性及储层保护性能，热滚回收率达93％，泥饼粘滞系数0．0875，LSRV达90000mPa·s以上，破胶后渗透率恢复值达90％以上。现场应用表明，该钻井液体系能满足水平井及大斜度井钻井的技术要求，具有良好的推广应用价值。

Research and Application of Drilling Fluid System for Horizontal Well in Jidong Oilfield

A clay -free horizontal drilling fluid system was developed to resolve the technical difficulty of drilling fluids for ho NaOH 0.1%, Na2 C 2%, lubricant HLB rizontal wells in Jidong Oilfield. The formula of the system was as follows： seawater, 030. 15%, viscosifier HVIS 0.7%, filtrate reducer HFLO 1.5%, inhibition agent HPA 1%, KCl 5%, and temporary blocking agent QWY 5%. The research result showed that the inhibition, temperature resistance, anti - contamination, lubrication, and reservoir protection of the drilling fluid system were excellent. The recovery rate of the system after hot rolling was as high as 93%, the viscosity factor of the mud cake was 0.0875, LSRV was up to 90,000 mPa·s, the permeability recovery after gel breaking was over 90%. The field application showed that this drilling fluid system met the technical requirement of horizontal well or high -inclination well drilling and was worthy of promotion.