库车山前超深巨厚储层缝网改造有效性评估

doi:10.3969/j.issn.1672-7703.2020.06.011

摘要/Abstract

摘要： 库车山前克深气田以白垩系巴什基奇克组为主力产层，最深探井已超8000m，储层压力达150MPa，最高温度为190℃，厚度为100～300m，极端工况条件及井控风险限制了改造后的测试手段。因此，对于该类储层能否实现体积改造及如何评估是否实现了体积改造，需要在现有技术手段下给出明确认识。通过总结库车山前超深层常用的缝网改造技术，基于影响储层改造纵向及横向缝网形成的地质条件及力学条件研究，分析了人工裂缝与天然裂缝耦合延伸形成复杂缝网的地质及工程因素；研究了暂堵转向成功时施工曲线理论变化，用暂堵转向剂进入人工裂缝后实际施工曲线与理论曲线对比分析，结合缝网改造井微地震监测解释，相互印证分析结论。综合研究认为，对于超深巨厚天然裂缝较发育储层，理论上通过压裂可实现横向缝网与纵向多层改造，但目前的缝内暂堵转向及缝口暂堵分层技术有效性不足。强化超深层暂堵分层及暂堵转向改造工艺技术研究，可为实现8000m 以深储层勘探突破及高效勘探提供强大的技术支持。

关键词: 超深储层, 缝网改造, 缝内转向, 层间转向, 评估分析

Abstract: The Cretaceous Bashijiqike Formation is the main producing layer of the Keshen gas field in the Kuqa piedmont. The deepest exploration well in the field is more than 8000 m. The reservoir pressure is 150 MPa, maximum temperature is 190 C, and the thickness is 100300 m. These extreme operating conditions and the attendant well-control risks limit the testing methods that can be used for evaluation of fracturing effects following stimulation. It is therefore necessary to develop a method for obtaining a clear understanding of whether this kind of reservoir is suitable for stimulation by volume fracturing and establish how to determine whether a reservoir has been effectively fractured. This study summarizes the network fracturing technologies commonly used for the ultra-deep reservoirs in the Kuqa piedmont. The geological and engineering factors that lead to the formation of complex fracture networks are analyzed. In doing so, interconnection and extension of artificial and natural fractures and the geological and mechanical conditions affecting the formation of longitudinal and transverse fracture networks are discussed. The theoretical change in operating curves that should result from successful temporary plugging diversion is studied. Actual operating curves and theoretical curves are then compared and analyzed after a temporary plugging diversion agent has been inserted in the artificial fractures. The conclusions are mutually verified by a combination of micro-seismic monitoring and interpretation of wells after network fracturing. The results show that, for ultra-deep and extremely-thick reservoirs with well-developed natural fractures, transverse fracture networks and longitudinal multi-layer stimulation can theoretically be achieved by fracturing. However, the temporary plugging diversion technologies currently used within fractures, and temporary plugging layering at the fracture opening, are ineffective. It is therefore important to engage in research on ultra-deep temporary plugging layering and temporary plugging diversion technologies that will provide strong technical support for efficient exploration of reservoirs deeper than 8000 m and increase the likelihood of exploration breakthroughs.

中图分类号:

杨战伟, 才博, 胥云, 刘举, 刘会锋, 王丽伟, 高莹, 韩秀玲, 王辽, 马泽元. 库车山前超深巨厚储层缝网改造有效性评估[J]. 中国石油勘探, 2020, 25(6): 105-111.

Yang Zhanwei, Cai Bo, Xu Yun, Liu Ju, Liu Huifeng, Wang Liwei, Gao Ying, Han Xiuling, Wang Liao, Ma Zeyuan. Evaluation of the effectiveness of network fracturing in ultra-deep and extremely-thick reservoir in the Kuqa piedmont[J]. China Petroleum Exploration, 2020, 25(6): 105-111.

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