准噶尔南缘高泉背斜钻井液技术难点与对策

Drilling Fluid Technology for Gaoquan Anticlinal Wells in the Southern Margin of Junggar Basin

徐生江 吴宝成 徐新纽 叶成 黄鸿

XUShengjiang WUBaocheng XUXinniu YECheng HUANGHong

中国石油新疆油田公司工程技术研究院, 新疆 克拉玛依 834000 中国石油新疆油田公司勘探事业部, 新疆 克拉玛依 834000

Research Institute of Engineering Technology, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China Exploration Division, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

针对准噶尔盆地南缘高泉背斜构造钻遇地层特点，通过分析已钻井资料，结合矿物成分及力学特征，指出该地区钻井存在安全密度窗口窄、冬季地面与地下温差大的技术难点。结合现场情况，给出了分别适应上部地层和中下部地层的钻井液体系，上部地层采用强抑制性水基体系；中下部地层塔西河组硬脆性泥岩地层，采用中等密度、强封堵油基钻井液，安集海河组等强水敏地层采用高密度、低滤失量的油基钻井液体系。结果表明，南缘高泉背斜上部地层采用强抑制水基钻井液体系可有效防塌、防黏卡；中下部地层采用的高密度油基钻井液具有优良的防塌、防漏性能，其耐温区间为-10~240 ℃，可抗高达40%盐水侵，可抗10%水敏性岩屑污染。钻井液技术为高泉构造油气重大发现提供了重要技术支撑，可为类似地区及构造探井提供钻井液方案参考。

In view of the characteristics of the strata encountered in drilling the Gaoquan structure in the southern margin of Junggar Basin, the technical difficulties in this area were proposed. We analyzed the drilled well data and mineral composition and mechanical characteristics and found problems like a narrow drilling safety density window and large surface-subsurface temperature difference. Combined with the field conditions, the drilling fluid systems adapted to upper strata and middle and lower strata respectively are given. We proposed that a strong inhibiting water-based system; a medium density and strong sealing oil-based drilling fluid system is applied to the hard and brittle mudstone formation of Taxihe Formation in the middle and lower strata; and oil-based drilling fluid system with low filtration loss is applied to strong water-sensitive formation of Anjihaihe Formation. The results show that the strong inhibiting water-based drilling fluid system can effectively prevent collapse and pipe stuck in the upper part of the Gaoquan anticline formation on the southern margin; the high-density oil-based drilling fluid used in the middle and lower part of the formation has excellent anti-collapse and anti-leakage performance, with a temperature resistance range of -10 ℃ to 240 ℃, and can resist up to 40% brine intrusion and 10% water-sensitive cuttings contamination. The drilling fluid technology provides important technical support for the major oil and gas discovery in the Gaoquan structure, and can be used as a reference for drilling fluid solutions for exploratory wells in similar areas and formations.

10.11885/j.issn.1674-5086.2021.04.29.08