Refrac Screening Processes in Unconventional Reservoirs, A Geomechanics Perspective

Yarlong Wang, M. Dusseault
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Abstract

Refracturing is often required in shale and tight gas formations because of inadequate initial HF design or unexpectedly rapid production decline. Water blocking because of fracturing liquid incompatibility, unexpected proppant embedment and crushing, shorter or curved primary fracture length because of premature screen off, general pressure depletion, primary fracture mis-orientation from stress shadowing, unfavourable poroelastic effects limiting the performance of the stimulated volume, and, in general, formation permeability reduction from stress sensitivity may all contribute to unsatisfactory or rapidly declining production. We emphasize the role of geomechanics in candidate screening and review the major factors leading to production decline in unconventional reservoirs. Although the fracture geometry may be altered in a staged fracturing process, the primary focus should be given to the formation permeability enhancement either due to shear dilation or induced fractured network elongation.
非常规储层裂缝筛分过程:地质力学视角
在页岩和致密气地层中,由于初始高频设计不足或产量意外快速下降,通常需要重复压裂。由于压裂液不相容导致的水堵塞、意外的支撑剂嵌入和破碎、过早关闭筛管导致的主裂缝长度变短或弯曲、普遍的压力枯竭、应力阴影导致的主裂缝定向错误、不利的孔隙弹性效应限制了增产体积的性能,以及通常由于应力敏感性导致的地层渗透率降低,这些都可能导致产量不理想或迅速下降。我们强调了地质力学在候选油藏筛选中的作用,并回顾了导致非常规油藏产量下降的主要因素。尽管在分段压裂过程中可能会改变裂缝的几何形状,但主要的重点应该放在由于剪切膨胀或诱导裂缝网络延伸而提高地层渗透率上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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