苏里格砂泥薄互储层缝控压裂造缝机制及穿层判别准则
谢锦阳(1999-),男,辽宁葫芦岛人,中国石油大学(北京)在读博士生,目前主要从事多岩性薄互层穿层压裂及页岩分布式光纤监测水力压裂等方面的研究工作。地址:北京市昌平区府学路18号,中国石油大学(北京)石油工程学院,邮政编码:102249。E-mail:xiejinyangcupb@foxmail.com |
Copy editor: 唐俊伟
收稿日期: 2024-06-03
修回日期: 2024-09-25
网络出版日期: 2024-10-15
基金资助
国家重点研发计划-中美政府间国际合作项目(2022YFE0129800)
中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项(ZLZX2020-02)
Fracture-controlled fracturing mechanism and penetration discrimination criteria for thin sand-mud interbedded reservoirs in Sulige gas field, Ordos Basin, China
Received date: 2024-06-03
Revised date: 2024-09-25
Online published: 2024-10-15
针对苏里格气田二叠系盒8段砂泥薄互储层压裂施工中裂缝穿层扩展判别与压裂效果评价存在的问题,建立考虑层间非均质性的砂泥薄互储层地质力学模型,开展水力裂缝穿层扩展实验,揭示砂泥薄互储层中人工裂缝的起裂-延伸-交互-穿层机制。基于非常规裂缝模型的数值模拟,阐明了裂缝在薄互层中的垂向起裂与扩展特征,构建了裂缝穿层的判别准则与压裂效果评价方法。研究表明:层间应力差是直接影响穿层压裂裂缝形态的主要地质因素,苏里格气田层间应力差异系数(ξIL)小于0.40时,裂缝可突破隔层在目标砂岩层内扩展;0.40≤ξIL<0.45时,裂缝突破隔层但无法在目标砂层内有效扩展;ξIL≥0.45时,裂缝仅在射孔储层扩展,无法实现穿层扩展。提高压裂液黏度与排量能弥补能量损耗并突破隔层限制,苏里格气田压裂施工参数控制区域内采用高黏度(50~100 mPa·s)压裂液、高排量(12~18 m3/min)施工条件有利于裂缝穿层。
谢锦阳 , 侯冰 , 何明舫 , 刘欣佳 , 魏靖依 . 苏里格砂泥薄互储层缝控压裂造缝机制及穿层判别准则[J]. 石油勘探与开发, 2024 , 51(5) : 1150 -1159 . DOI: 10.11698/PED.20240366
Considering the problems in the discrimination of fracture penetration and the evaluation of fracturing performance in the stimulation of thin sand-mud interbedded reservoirs in the eighth member of Shihezi Formation of Permian (He-8 Member) in the Sulige gas field, a geomechanical model of thin sand-mud interbedded reservoirs considering interlayer heterogeneity was established. The experiment of hydraulic fracture penetration was performed to reveal the mechanism of initiation-extension-interaction-penetration of hydraulic fractures in the thin sand-mud interbedded reservoirs. The unconventional fracture model was used to clarify the vertical initiation and extension characteristics of fractures in thin interbedded reservoirs through numerical simulation. The fracture penetration discrimination criterion and the fracturing performance evaluation method were developed. The results show that the interlayer stress difference is the main geological factor that directly affects the fracture morphology during hydraulic fracturing. When the interlayer stress difference coefficient is less than 0.4 in the Sulige gas field, the fractures can penetrate the barrier and extend in the target sandstone layer. When the interlayer stress difference coefficient is not less than 0.4 and less than 0.45, the factures can penetrate the barrier but cannot extend in the target sandstone layers. When the interlayer stress difference coefficient is greater than 0.45, the fractures only extend in the perforated reservoir, but not penetrate the layers. Increasing the viscosity and pump rates of the fracturing fluid can compensate for the energy loss and break through the barrier limit. The injection of high viscosity (50-100 mPa·s) fracturing fluid at high pump rates (12-18 m3/min) is conducive to fracture penetration in the thin sand-mud interbedded reservoirs in the Sulige gas field.
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