强封堵油基钻井液体系的研究和应用

基于页岩气井水平段易失稳，油基钻井液漏失将会造成巨大的经济损失，因此水平段对油基钻井液体系的性能要求越来越高。针对以上问题，通过正交试验研制了一种新型的强封堵油基钻井液体系，室内试验证明该体系具有良好的抗污染性、乳化稳定性、失水量低、流变性好、粘度和切力适中。焦页195-1HF井的现场应用和与邻井焦页200-1HF井等数口井的对比，强封堵油基钻井液体系的应用大大降低了漏失风险和漏失成本，节省了11 d的工期，在页岩气开采中具有良好的应用前景。

Research and Application of Strong Plugging Oil-based Drilling Fluid System

Due to the instability of shale gas horizontal well, oil-based drilling fluid leakage will cause a great economic loss; so the property requirement of oil-based drilling fluid system is higher and higher. In view of the above issues, a new type of strong plugging oil-based drilling fluid system has been developed by orthogonal test; the laboratory tests show that this system has excellent stain resistance, emulsifying stability, low fluid loss, good rheology, moderate viscosity and shear force. By the application of strong plugging oil-based drilling fluid system, well Jiaoye195-1HF shows that the leakage risk and loss cost are greatly reduced compared to well Jiaoye200-1HF which used common drilling fluid and several other wells; in this circumstance, 11 days are saved; this strong plugging drilling fluid system has good application prospect.