页岩气储层改造的体破裂理论与技术构想
发布时间:2018-11-22 17:04
【摘要】:中国页岩气可采储量居世界第一位,但是中国页岩气开发面临气藏赋存条件复杂、地质构造运动剧烈、储层渗透性极低、气藏富集区水资源匮乏等一系列难题,迫切需要创新页岩储层改造的理论和方法,探索适合中国页岩气高效开发的非常规理论与技术.本文简要分析了目前储层压裂改造的主要方法、原理及面临的难题和挑战,提出了储层改造的体破裂理论及技术构想.定义体破裂是三维岩体在载荷作用下,内部孔隙、层理裂隙及人工裂隙互相作用、充分发展和贯穿、并形成新的三维裂隙网络系统这一完整力学过程,是岩体大尺度、多裂隙、高强度的破坏和能量释放的过程.指出页岩三维断裂形态和扩展机理、人工裂隙与结构裂隙相互作用、缝网形态和演化、实现高度体破裂的载荷类型、方式与介质以及真实三维断裂过程的可视化与计算模拟新技术等构建了体破裂力学理论的研究框架.基于早期实验室以及现场实验的探索,提出和分析了实现体破裂的新技术及有待研究的关键科学问题和技术难点.
[Abstract]:The recoverable reserves of shale gas in China rank first in the world. However, the development of shale gas in China is faced with a series of difficult problems, such as complex conditions of gas reservoir occurrence, intense geological tectonic movement, extremely low permeability of reservoir, lack of water resources in rich gas reservoirs, etc. It is urgent to innovate the theory and method of shale reservoir reconstruction and to explore the unconventional theory and technology suitable for high efficiency development of shale gas in China. This paper briefly analyzes the main methods, principles, problems and challenges of reservoir fracturing at present, and puts forward the theory and technical conception of reservoir fracturing. The definition of mass fracture is a complete mechanical process, which is the interaction of internal pores, bedding fractures and artificial fissures, and the formation of a new three-dimensional fracture network system, which is a complete mechanical process of rock mass with large scale and multiple fissures. The process of high intensity destruction and energy release. It is pointed out that the three dimensional fracture morphology and propagation mechanism of shale, the interaction between artificial fracture and structural fracture, the shape and evolution of fracture net, and the load type of high body fracture can be realized. The new techniques of visualization and simulation of the real 3D fracture process, such as the mode and medium, are used to construct the research framework of the theory of bulk fracture mechanics. Based on the exploration of early laboratory and field experiments, this paper puts forward and analyzes the new technology of realizing volume rupture and the key scientific problems and technical difficulties to be studied.
【作者单位】: 四川大学能源工程安全与灾害力学教育部重点实验室;中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学煤炭资源与安全开采国家重点实验室;四川大学建筑与环境学院;
【基金】:国家重点基础研究发展计划(2011CB201201) 国家杰出青年科学基金(51125017) 国家自然科学基金(51374213,51134018) 四川省科技厅科技支撑计划(2012FZ0124)
【分类号】:TE357
[Abstract]:The recoverable reserves of shale gas in China rank first in the world. However, the development of shale gas in China is faced with a series of difficult problems, such as complex conditions of gas reservoir occurrence, intense geological tectonic movement, extremely low permeability of reservoir, lack of water resources in rich gas reservoirs, etc. It is urgent to innovate the theory and method of shale reservoir reconstruction and to explore the unconventional theory and technology suitable for high efficiency development of shale gas in China. This paper briefly analyzes the main methods, principles, problems and challenges of reservoir fracturing at present, and puts forward the theory and technical conception of reservoir fracturing. The definition of mass fracture is a complete mechanical process, which is the interaction of internal pores, bedding fractures and artificial fissures, and the formation of a new three-dimensional fracture network system, which is a complete mechanical process of rock mass with large scale and multiple fissures. The process of high intensity destruction and energy release. It is pointed out that the three dimensional fracture morphology and propagation mechanism of shale, the interaction between artificial fracture and structural fracture, the shape and evolution of fracture net, and the load type of high body fracture can be realized. The new techniques of visualization and simulation of the real 3D fracture process, such as the mode and medium, are used to construct the research framework of the theory of bulk fracture mechanics. Based on the exploration of early laboratory and field experiments, this paper puts forward and analyzes the new technology of realizing volume rupture and the key scientific problems and technical difficulties to be studied.
【作者单位】: 四川大学能源工程安全与灾害力学教育部重点实验室;中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学煤炭资源与安全开采国家重点实验室;四川大学建筑与环境学院;
【基金】:国家重点基础研究发展计划(2011CB201201) 国家杰出青年科学基金(51125017) 国家自然科学基金(51374213,51134018) 四川省科技厅科技支撑计划(2012FZ0124)
【分类号】:TE357
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