页岩气体积压裂支撑裂缝长期导流能力研究现状与展望

Research and Prospect of Long-term Fracturing Conductivity in Volumetric Fracturing for Shale Gas Reservoir

水平井分段压裂形成复杂体积缝网是页岩气有效开采的关键技术之一,复杂体积缝网依靠支撑剂支撑并成为页岩气渗流的重要通道。支撑裂缝长期导流能力是影响页岩气压后产能的重要因素,而关于页岩气体积压裂支撑裂缝长期导流能力的研究尚未形成统一认识。通过分析国内外最新研究动态,阐述了支撑剂支撑裂缝长期导流能力研究的重要性;分析了目前国内外关于支撑剂长期导流能力的实验测试与理论预测方面的研究成果;剖析了非达西渗流效应、多相渗流效应、地层水性质等特殊因素对长期导流能力的影响程度;提出了页岩气体积压裂支撑裂缝长期导流能力研究方向的着重点。

Staged fracturing in horizontal wells forms complex fracturing network is one of the key and effective technologies for shale gas. The fracturing network also becomes an important channel for shale gas flow from forma-tion into the wellbore. Long-term fracturing conductivity is a principal element for shale gas productivity, but all studies has not yet form a unified cognition. Through analyzing the latest research at home and abroad, the impor-tance of long-term fracturing conductivity was expounded, analysied the research results of the prediction theory model and experiment test. the special factors impact the long-term fracturing conductivity was analyzed, such as non-darcy seepage effect, multiphase seepage effect and formation water. In the final, the future development and the problems which should be focused were proposed.