KCl聚磺钻井液在TP338H井三开的应用

Application of KCl polysulfonate drilling fluid in the third drilling of well TP338H

在TP338H井的几口邻井施工时,三开井段均采用常规聚磺钻井液体系,在钻井过程中,PDC钻头泥包、井壁失稳垮塌、下钻大段划眼等复杂情况时有发生,严重影响了钻井施工进度。通过查询和调研相关钻井液资料,决定在TP338H井三开使用KCl聚磺钻井液体系,以聚磺钻井液为基础,通过加入KCl来增强其抑制性和防塌性能。室内性能评价表明,KCl聚磺钻井液的抑制防塌性、高温稳定性、抗污染性、润滑性及流变性能均优于常规聚磺钻井液体系。该井三开井段施工顺利,未出现钻头泥包、严重垮塌等复杂情况,KCl聚磺钻井液体系在该井取得了良好的应用效果,对以后该区块的钻井液施工具有很好的参考意义。

In the construction of adjacent wells of well TP338H, the third drilling sections all adopted the conventional polysulfo？nate drilling fluid. In the process of drilling, some complex situations often occurred, including PDC bit balling, wellbore instability and long section reaming, which affected the drilling construction schedule seriously. Through researching the related materials of drilling fluid, in the third drilling of well TP338H, KCl polysulfonate drilling fluid system was adopted. Using polysulfonate drilling fluid as the foundation, the inhibition and anti collapse properties were enhanced by adding KCl. The indoor results show that, the performances of KCl polysulfonate drilling fluid system are superior to those of conventional polysulfonate drilling fluid system, among them, the performances include inhibition and anti collapse, high temperature stability, anti pollution ability, lubricity and rheological properties. The third drilling construction of this well was smooth, and the complex situations including bit balling and serious collapse were not happened. KCl polysulfonate drilling fluid system achieves good results in the well, thereby offering good references for future construction in this block.