涪陵页岩气田低黏低切聚合物防塌水基钻井液研制及现场试验

摘要

During drilling in Jiaoshiba Block of Fuling Area ,problems were encountered in the second spudding as high viscosity of drilling fluid ,high drag ,large torque and that WOB could not be transmitted to the bit during directional drilling .To address these problems ,a kind of polymer collapse‐resistant wa‐ter‐based drilling fluid with low viscosity and low gel strength was developed .Laboratory tests showed that the water‐based drilling fluid demonstrated good inhibition ,lubricity ,plugging properties and con‐tamination resistance ,high temperature resistance up to 100 ℃ .It was successfully implemented in the second‐spudding in the Jiaoshiba Block ,and the problems that caused by formation hydration ,including high viscosity and high density as well as ineffective transmission of WOB were solved effectively ,so as to keep normal drilling ,shorten drilling cycle time and improve drilling efficiency .%为了解决涪陵地区焦石坝区块二开钻井过程中钻井液黏度高、摩阻高、扭矩大及定向托压严重等问题，研究了一种低黏低切聚合物防塌水基钻井液。室内试验表明，该水基钻井液抑制性、润滑性、封堵性良好，抗温能达100℃，且具有很好的抗污染能力。该钻井液在涪陵地区焦石坝区块二开井段进行了现场试验，有效解决了因地层钻屑水化造浆而造成的钻井液黏度升高、密度升高及井下托压严重等问题，保证了井下作业的正常进行，缩短了钻井周期，提高了钻井效率。