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针对东方1—1气田储层岩石胶结疏松,细砂岩孔隙度在14.3%~21.1%,渗透率范围值在0.28×10-3~3.2×10-3μm2,具极强水敏性和弱的酸敏性及碱敏性。为此,开发出了满足钻井工程和储层保护要求的快速弱凝胶水平井钻井液,该钻井液具有无固相、快速弱凝胶特性。室内实验和现场应用均表明,该钻井液具有独特的流变性,维护简单和优异的储层保护性能,特别适用于水平井水平段的钻进。
In view of the loosely cemented rock in the reservoir of East 1-1, the porosity of fine sandstone is in the range of 14.3% ~ 21.1% and the permeability is in the range of 0.28 × 10-3 ~ 3.2 × 10-3μm2 with strong water sensitivity and weak acid Sensitivity and alkali sensitivity. To this end, we have developed a fast weak gel horizontal well drilling fluid that meets the requirements of drilling engineering and reservoir protection. The drilling fluid has the characteristics of no solid phase and fast weak gel. Laboratory experiments and field applications show that the drilling fluid has unique rheological properties, simple maintenance and excellent reservoir protection performance, especially suitable for horizontal well horizontal drilling.