甲酸盐无固相钻井液体系在大港滩海地区的应用

Application of Formate, Non-Solid Drilling Fluid System in Dagang Offshore Area

甲酸盐钻井液体系具有密度范围宽、无毒、可生物降解、与地层流体配伍性好、腐蚀性很小。不损害产层等优点 ,但相对成本较高。室内评价试验表明 ,该钻井液体系的抑制性很强 ,抗固相及盐污染的能力很强 ,岩心渗透率恢复率达 80 %以上 ,具有良好的油气层保护效果。在大港油田滩海地区 9口井的应用表明 ,该钻井液体系能有效地解决该地区中浅层钻井过程中井壁易坍塌 ,起下钻阻卡严重等问题 ,但其成本相对较高 。

Formate drilling fluid system has many advantages, such as wide density window, non toxic, good compatibility, low corrosive and no damage to reservoirs. The laboratory evaluation tests show that this system has strong inhibition, solid resistance and salt resistance. Field applications in nine wells in Dagang offshore area show that this drilling fluid system can effectively prevent caving and sticking during drilling operations and trips. However, its cost is relatively high.