靖南地区水平井钻井液技术研究及应用

Study and Application of Horizontal Well Drilling Fluid Technology in Jingnan Region

摘要:

针对鄂尔多斯靖南地区水平井钻井过程中存在的煤层、碳质泥地层井壁失稳和定向钻井托压问题，开展了钻井液抑制防塌、地层封堵和润滑减阻技术研究，形成了具有良好防塌、润滑能力的钻井液配方，页岩滚动一次回收率≥98%，极压润滑系数达0.05。通过现场2口井的应用试验，应用井段平均井径扩大率为1.71%和4.06%，钻具摩阻40～80 kN，钻井、完井顺利。

Abstract:

According to the borehole instability of coal bed and carbonaceous mud strata and support pressure of directional drilling in the course of horizontal drilling in Jingnan region of Erdos, the study was carried out on anti-caving and formation blocking as well as lubricating and resistance-reducing technologies of drilling fluid. A drilling fluid formula with good anti-caving and lubrication ability was developed, which brought shale rolling recovery ≥98% and extreme pressure lubrication coefficient up to 0.05. In the application tests of 2 wells in the field, the average well diameter expansion rate in application well sections were 1.71% and 4.06%, respectively and the drilling tool friction resistance was 40～80kN. Drilling and well completion was conducted successfully.