裂缝几何控制技术可防止Bakken井眼干扰

K. Vidma, P. Abivin, Derek Fox, M. Reid, F. Ajisafe, A. Marquez, W. Yip, J. Still
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引用次数: 5

摘要

钻井填充井的增加趋势(2017年超过60%的新井)伴随着井干扰或“压裂命中”的重大风险。在水力压裂作业中,当待压裂井与相邻的现有井之间存在直接压力通信时,就会发生压裂冲击。在极端情况下,裂缝可能会将邻近井筒填满沙子,这需要昂贵的清理干预措施。裂缝几何形状控制技术旨在通过部署远场导流技术来降低井干扰的可能性。本文介绍了一个独特的现场试验,证明了这些技术的价值和有效性。在Bakken,在现有的部分枯竭的主井两侧,分别钻了1300英尺和800英尺的子井。每口小井都包括50段滑溜水,采用拉链式压裂方式完成。在更远的井中,没有使用任何裂缝几何控制技术。在较近的井中,50级压裂中有20级(每5级1级)采用了远场导流材料。在两口处理井之间,泵送计划的所有其他参数相同。在所有作业过程中,对所有三口井(母井和两口子井)进行了高频压力监测。母井在作业过程中未受到破坏。然而,在子井处理的前35个阶段,母井的压力突增,直到稳定在预期的油藏压力附近。在本文中,每个井的干扰实例都被量化,并归因于其中一个子井的处理阶段。有趣的是,并不是所有的阶段都导致了压力的增加。值得注意的是,根据压力增加的幅度和陡峭程度,可以观察到不同程度的压裂冲击。压裂冲击与未使用远场暂堵剂的相关性是惊人的。结果清楚地表明,裂缝几何形状控制技术通过控制裂缝的生长来减少直接井干扰的发生。这些井的作业为设计现场实验提供了一个独特的机会,以评估裂缝几何形状控制技术在填充井增产过程中对井干扰的影响。结果表明,该技术减少了枯竭母井直接压裂命中的发生。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fracture Geometry Control Technology Prevents Well Interference in the Bakken
The increasing trend of drilling infill wells (more than 60% of new wells in 2017) comes with the significant risk of well interference, or "frac hits". Frac hits occur during hydraulic fracturing operations when there is direct pressure communication between the well being treated and adjacent, pre-exisiting wells. In extreme cases, the fracture may fill the adjacent wellbore with sand, which requires expensive cleanup intervention. Fracture geometry control technologies aim to reduce the likelihood of well interference by deploying far-field diversion techniques. This paper presents a unique field experiment that demonstrates the value and effectiveness of these technologies. In the Bakken, two child wells were drilled 1,300 and 800 ft, respectively, on each side of an existing, partially depleted parent well. Each child well treatment comprised 50 stages of slickwater, completed in zipper frac style. Treatments in the farther well did not utilize any fracture geometry control technology. In the nearer well, 20 of 50 stages (one every 5 stages) included far-field diversion material. All other parameters of the pumping schedules were the same between the two treated wells. Pressures were monitored in all three wells (parent and two child wells) at high frequency during all operations. The parent well was not damaged during the operation. However, during the first 35 stages of the child well treatments, the parent well's pressure increased in spurts, until it stabilized near expected reservoir pressure. In this paper, each instance of well interference is quantified and attributed to a treatment stage in one of the child wells. Interestingly, not all stages contributed to the pressure buildup. Significantly, various levels of frac hits were observed, as determined by the magnitude and steepness of the pressure increase. The correlation of frac hit with the absence of far-field diverter is striking. The results clearly demonstrate that fracture geometry control technologies reduce the occurrence of direct well interference by containing fracture growth. The operations in these wells created a unique opportunity to design a field experiment to assess the effect of fracture geometry control technology on well interference during infill well stimulation. The results demonstrate that such technologies reduce the occurrence of direct frac hits in depleted parent wells.
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