摘要
长7页岩油储层致密但流体流动性好,砂岩储层存在微米级孔隙,加上存在断层构造,导致钻进过程中渗透性漏失、裂缝性漏失甚至失返性漏失频发,常规堵漏材料无法满足钻井施工要求,造成非生产时间和成本大幅度增加,严重制约了勘探开发进程。借助超分子化学理论,通过合成优化配方,研发出了新型超分子聚合物防漏堵漏材料,并对其微观结构、剪切稀释性和恶性漏失承压堵漏能力进行了表征与测试。研究结果表明,超分子聚合物堵漏材料不仅具有优异的剪切稀释性和黏附能力,而且对两层钢珠床(钢珠直径8~10 mm)模拟的大孔隙性漏失和直缝板(缝宽2~6 mm)模拟的裂缝性漏失均具有较强的承压堵漏效果,承压达6 MPa。在长7页岩油区块典型恶性漏失井应用表明,超分子聚合物堵漏技术可以有效提高裂缝性漏层的承压能力,减少漏失量并降低综合堵漏成本,助力长7页岩油勘探开发,值得进一步研究和推广。
The Chang 7 shale oil reservoir is tight but has good fluid fluidity, which has micron-scale pores and fracture structure,leading to frequent permeable loss, fractured loss and total loss during the drilling process. Conventional plugging materials cannot meet the drilling construction requirements, resulting in a significant increase in non-production time and costs, and severely restricting the exploration and development process. Based on the theory of supramolecular chemistry, this research developed a new type of supramolecular polymer plugging material through synthesis formula optimization, and characterized and tested its microstructure, shear thinning and loss mitigation and pressure-bearing plugging ability. The research results show that the supramolecular gel plugging material not only has excellent shear thinning properties and adherence abilities, but also has a strong pressure-bearing plugging effect in large pore loss zones simulated by two-layer steel ball beds(the steel ball diameters are 8 mm ~ 10 mm) and fractured loss zones simulated by longitudinal slotted plate(the fracture widths are 2 mm~6 mm), with a pressurebearing capacity up to 6 MPa. Its application of typical total loss well in Chang 7 shale oil block shows that supramolecular gel plugging technology can effectively improve the pressure-bearing capacity of fractured loss zones reducing loss volume and comprehensive plugging costs, and helps Chang 7 shale oil exploration and development. Thus, it is worthy of further research and promotion.
作者
艾磊
宫臣兴
谢江锋
蒋官澄
崔凯潇
邓正强
AI Lei;GONG Chenxing;XIE Jiangfeng;JIANG Guancheng;CUI kaixiao;DENG Zhengqiang(Research Institute of Oil&Gas Technology,PetroChina Changqing Oilfield Company,National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an,Shaanxi,710018,China;State Key Laboratory of Petroleum Resources and Prospecting,MOE Key Laboratory of Petroleum Engineering,China University of Petroleum,Beijing 102249,China)
出处
《钻井液与完井液》
CAS
北大核心
2021年第6期705-714,共10页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项鄂尔多斯盆地致密油开发示范工程“致密油水平井钻完井技术研究与应用”(2017ZX05069004)。
关键词
井漏
裂缝性漏失
超分子聚合物
长7页岩油
Lost circulation
Fractured loss
Supramolecular polymer
Chang 7 shale oil
