深层页岩气水平井体积压裂技术

发布时间：2018-08-07 12:01

【摘要】：深层(深度超过3 500 m)页岩气储层地应力高、水平两向应力差异大、层理和天然裂隙分布复杂、岩石塑性特征强,导致水力裂缝破裂延伸困难、裂缝复杂性程度及改造体积低、导流能力低且递减快,极大制约了深层页岩气的经济有效开发。为此提出了针对性与现场可操作性均强的深层页岩气水平井体积压裂技术方案,即以平面射孔、多尺度造缝、全尺度裂缝充填及高角度天然裂缝延伸控制为核心,配套形成了多级交替注入模式(酸、滑溜水、胶液)以及以变黏度、变排量、混合粒径及小粒径支撑剂为主体的工艺方法,最大限度地提高了深层页岩气的有效改造体积(ESRV)。在四川盆地永川、威远及焦石坝南部等深层页岩气井的压裂中,部分成果获得应用,实施效果显著。其中,永页1HF及威页1HF压后初产分别为14.1×10~4 m~3/d和17.5×10~4 m~3/d。深层页岩气水平井体积压裂技术的突破,对确保涪陵二期深层3 500~4 000 m深度范围内50×10~8 m~3页岩气产能建设目标的实现、垂深不超过6 000 m以内的巨大页岩气资源量的经济开发动用,都具有十分重要的现实指导意义。
[Abstract]:Deep shale gas reservoirs (depth more than 3 500 m) have high in-situ stress, great difference in horizontal two direction stresses, complex distribution of bedding and natural fractures, strong plastic characteristics of rock, resulting in difficulty of fracture extension, low degree of fracture complexity and low reconstruction volume. The low conductivity and rapid decline greatly restrict the economic and effective exploitation of deep shale gas. In this paper, a new method of volume fracturing for deep shale gas horizontal wells is proposed, which is based on plane perforation, multi-scale fracturing, full-scale fracture filling and high angle natural fracture extension control. The multi-stage alternative injection mode (acid, slippery water, glue liquid) and the process method with variable viscosity, variable displacement, mixed particle size and small particle size proppant were formed to maximize the improvement volume (ESRV). Of deep shale gas. In the fracturing of deep shale gas wells in Yongchuan, Weiyuan and the south of Jiaoshiba in Sichuan Basin, some achievements have been applied and the effect is remarkable. Among them, the initial production of 1HF and 1HF were 14.1 脳 10 ~ (4) m ~ (3 / d) and 17.5 脳 10 ~ (4) m ~ (3 / d) / d respectively. The breakthrough of volume fracturing technology of deep shale gas horizontal well can ensure the realization of productivity construction target of 50 脳 10 ~ 8 m ~ (-3) shale gas in the depth range of 3 500 ~ 4 000 m deep in Fuling Phase II. The economic exploitation and utilization of huge shale gas resources with a vertical depth of less than 6 000 m are of great practical significance.
【作者单位】：中国石化石油工程技术研究院;页岩油气富集机理与有效开发国家重点实验室;
【基金】：国家自然科学基金“页岩油气高效开发基础研究”(编号:51490653) 国家重大科技专项“彭水地区常压页岩气勘探开发示范工程”(编号:2016ZX05061-002) 中国石化科技攻关课题“涪陵区块页岩气层改造技术研究”(编号:P14091)
【分类号】：TE377

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