新型水基钻井液体系在页岩气钻井中应用探讨

Discussion on Application of New Water-Based Drilling Fluid System in Shale Gas Drilling

摘要:

目前中国页岩气水平井水平段钻井主要使用油基钻井液，但油基岩屑处理费用昂贵，急需开发和应用一种具有环境保护特性的高性能水基钻井液体系。通过室内实验，优选出适合于水基钻井液的封堵剂、降失水剂等主要处理剂，进而研制出了钾铵基聚磺成膜钻井液体系配方，并进行了抗温性、润滑性、防塌抑制性、封堵性、抗污染性性能评价实验。结果表明：钾铵基聚磺钻井液流变性能良好，抗温可达150 ℃；润滑性能优良，具有较好的抗盐、抗钙污染性能和防漏封堵性能，防塌抑制性强。

Abstract:

Oil-based drilling fluid is mainly used for horizontal sections drilling of shale gas horizontal well in China. Due to the expensive cost of cutting treatment, it is urgent to develop and apply a high performance water-based drilling fluid system with environmental protection characteristics. By the laboratory experiments, main treatment agents of plugging agent and filtration-reducing agent were optimizingly selected, and the formula of potassium ammonium chloride based film-forming drilling fluid system was developed with evaluation experiments on temperature resistance, lubrication, anti-collapse and inhibition, plugging and anti-pollution properties. The experimental results show that this drilling fluid has good rheology with excellent temperature resistance up to 150℃, it is also featured by good lubrication performance, strong resistance to salt and calcium pollution, leakage proof and plugging as well as strong anti-collapse and inhibition.