支撑剂沉降规律对页岩气压裂水平井产能的影响

发布时间：2018-06-04 22:54

本文选题：支撑剂沉降 + 敏感性分析　；参考：《石油钻采工艺》2017年05期

【摘要】：压裂工艺后支撑剂的分布及裂缝形态对页岩气井的产能有很大影响。为了研究支撑剂沉降规律,建立了综合考虑页岩气吸附解吸附及应力敏感的气藏数值模型,并在模型中提出了表征支撑剂沉降的方法。通过对比分析不同射孔位置、不同沉降程度、裂缝导流能力、储层基质渗透率等参数变量,考虑了支撑剂沉降的页岩气藏压力分布和产能特征,得出影响支撑剂沉降后气井产能的主控因素。结果表明,支撑剂沉降大幅度降低了气井产能;考虑压裂过程中支撑剂运移沉降,应在油气藏中下部进行射孔;页岩气藏裂缝导流能力达到4μm~2·cm即可满足气井的有效开采,选用40/70目支撑剂进行压裂施工,建议优先造主缝;基质渗透率越高,支撑剂沉降对气井产能影响越大,高渗带要采取防止支撑剂沉降的措施。此模型考虑了支撑剂沉降的特性,对页岩气井产能的预测和现场压裂施工具有重要指导意义。
[Abstract]:The distribution of proppant and fracture morphology after fracturing process have great influence on the productivity of shale gas wells. In order to study the law of proppant settlement, a numerical model of gas reservoir with comprehensive consideration of shale gas adsorption desorption and stress sensitivity was established, and a method to characterize the settlement of proppant was put forward in the model. By comparing and analyzing parameter variables such as different perforation location, different settlement degree, fracture conductivity and reservoir matrix permeability, the pressure distribution and productivity characteristics of shale gas reservoir with proppant sedimentation are considered. The main controlling factors of gas well productivity after proppant sedimentation are obtained. The results show that the proppant subsidence greatly reduces the gas well productivity, considering the proppant migration and settling during the fracturing, perforation should be carried out in the middle and lower part of the reservoir, and the fracture conductivity of the shale gas reservoir reaches 4 渭 m ~ 2 cm, which can satisfy the effective production of the gas well. Using 40 / 70 mesh proppant for fracturing operation, it is suggested that priority should be given to the construction of main fractures; the higher the matrix permeability, the greater the influence of proppant sedimentation on gas well productivity, and the measures to prevent proppant sedimentation should be taken in high permeability zone. This model takes into account the characteristics of proppant sedimentation and is of great significance for prediction of shale gas well productivity and field fracturing operation.
【作者单位】：中国石油大学(北京)石油工程学院;大庆油田有限责任公司采油工程研究院;
【基金】：国家自然科学基金“页岩气储层压裂液滞留机理与模拟研究”(编号:51504266) 高等学校博士学科点专项科研基金课题“页岩气藏大规模非对称体积改造基础理论研究”(编号:20120007110004)
【分类号】：TE377

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