兴隆1井钻井液工艺技术

兴隆1井位于霸县凹陷，是渤海湾盆地冀中坳陷北部一个西断东超的箕状断陷，该井是高家堡地区的一口风。险探井，完钻井深为5500m。该地区地层以膏岩、膏泥岩、膏盐岩和含膏泥岩为主，地层胶结性较差，可塑性强，极易发生井漏、井塌、盐层卡钻等复杂事故。该井二开用高抑制性钻井液，三开用抗高温、抗污染高密度钻井液，四开用欠平衡钻井液。三开钻井液解决了该地区大井眼携岩、井壁稳定、膏盐层污染、电测和欠平衡保护油气层等钻井问题。现场应用表明，高抑制性钻井液确保了该井段井眼畅通，起下钻、电测完和下套管顺利；抗污染、抗高温、抗高密度钻井液利于井壁稳定，能抑制油页岩、泥页岩、膏泥岩互层引起的剥落掉块，满足了钻井施工的要求；欠平衡钻井液具有良好的保护井壁稳定的能力，较好地保护了油气层。

The Drilling Fluid Technology in Well XingLong-1

The well XingLong-1, located in Gaojiapu in Middle-Hebei Sag (which is dustpan-shaped sag) in the Bohai Bay, is a risk exploratory well which is completed at a depth of 5500 m. The formations in this area are characteristic of being massive gypsum, salt and shales. The formations have poor cementation and strong plasticity. Mud losses, borehole collapse, pipe sticking in the salt-containing formations are not uncommon. The mud used to drill this well are as follows: Highly inhibitive mud in the second section, high density mud in the third section, and drilling fluid for under-balanced drilling in the fourth section. The mud in the third section successfully solved the cutting-carrying, borehole stability, contamination by salt and gypsum, and the reservoir protection problems. Field application showed that different muds in the different sections have satisfied the requirement for a successful drilling. Using the inhibitive mud, a near-gauge hole had been obtained in formations containing water-sensitive shales, and tripping, electric logging and cementing had all been done successfully. The high density mud controlled borehole instability by exerting a mechanical force on the sloughing formations, while the mud for under-balanced drilling protected the reservoir from being impaired.