石油钻采工艺2026，Vol.48Issue(2)：148-156,9.DOI:10.13639/j.odpt.202508037
正宁油田中生界钻井漏失机理与堵漏剂优化设计
Study on the mechanism of drilling fluid loss and optimization of lost circulation additives in Mesozoic,Zhengning Oilfield
摘要
Abstract
Frequent severe lost circulation occurs during Mesozoic drilling in Zhengning Oilfield,while the loss mechanism remains unclear and efficient plugging of loss zones fails to be achieved,which seriously restricts the exploration and development of tight oil and gas reservoirs in this block.To address this issue,the mineral composition and microstructure of the loss intervals were analyzed by X-ray diffraction and scanning electron microscopy.The results show that the content of easily hydrated minerals in the loss intervals is low and the overall dispersion capacity of the rocks is weak,while the hydration dispersion is significantly enhanced in local intervals with high illite/smectite mixed-layer content,and drilling fluid invasion may induce deterioration of the rock structure.Natural fractures are identified as dominant controlling factor for lost circulation.On this basis,an innovative fracture-width inversion m ethod based on drilling fluid properties and loss data is proposed,and a fracture-width calculation chart under different drilling fluid viscosities is established,enabling rapid quantitative evaluation of fracture width in the loss intervals.Using this chart,75 groups of historical lost-circulation data were inverted.The results indicate that natural fractures expand significantly under drilling-fluid pressure during loss events,and large fractures wider than 4 mm account for more than 55%,reaching the level of hydraulic fractures.According to the fracture dimension distribution,six different types of lost-circulation additives were systematically evaluated and optimized,and a lost circulation additives design chart corresponding to different fracture widths is established.Field applications show that this method remarkably improves the response and plugging efficiency for lost circulation.For 7 wells treated under the guidance of this chart,the success ratio of first-attempt plugging increased by 65.7%and the average operation time was reduced by 83.6%compared with conventional plugging practices,providing strong technical support for the safe and efficient development of tight oil and gas resources in Zhengning Oilfield.关键词
正宁油田/井漏/裂缝尺寸反演/堵漏剂优化/桥接堵漏Key words
Zhengning Oilfield/lost circulation/fracture dimensions inversion/optimization of lost circulation additives/bridging plugging分类
能源科技引用本文复制引用
王海洋,肖云峰,杨书港,彭方泉,苏旭,谷团,周德胜..正宁油田中生界钻井漏失机理与堵漏剂优化设计[J].石油钻采工艺,2026,48(2):148-156,9.基金项目
国家自然科学基金联合基金项目"超深储层水力压裂改造裂缝轨迹延伸机理与控制方法研究"(编号:U23B2089) （编号:U23B2089）
国家自然科学基金青年科学基金项目(C类)"渗流力作用下深层煤岩气储层水力裂缝扩展与缝网形成机理研究"(编号:52504036). （C类）
