Network Fracturing Technology Applied to Xu 5 Tight Gas Reservoirs in the Xinchang Gas Field
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摘要: 新场气田须五气藏为砂泥岩互层致密气藏,具有储层埋藏深、非均质性强、裂缝局部发育、含水特征明显、多层叠置等特征,自然产能低,经济开发难度大。为解决该问题,在深入研究该气藏的工程地质特征的基础上,借鉴国内外页岩气体积压裂改造理念,以经济压裂为核心,研究形成了以低成本高性能组合压裂液体系、大排量双通道注入管柱及缝网压裂优化设计方法为核心的缝网压裂集成技术。21口井的现场应用情况表明,该集成技术针对性较强, 能使储层产能充分释放, 技术方案合理可靠, 为须五致密气藏的经济高效开发提供了的技术支撑。Abstract: The Xu 5 gas reservoir in the Xinchang Gas Field is a tight gas reservoir composed of interbeds of sandstones and mudstones. It is characterized by deep burial depth, strong heterogeneity, local fracture development, distinct water bearing properties, multi-layer superposition, low natural productivity and positive economic development is difficult. In order to solve these problems, an integrated technology which combines a low-cost high-performance fracturing fluid system, high flow rate and a two-way injection string with network fracturing optimization design was developed, taken the economic fracturing as the core and volumetric fracturing of shale-gas-reservoir as new concept. Field application in 21 wells showed that the integrated technology was of deep importance and could unlock steps that would result in efficient productivity. The technical scheme was considered to be reliable, and it can provide a strong technical support for, in the future, developing the gas reservoirs efficiently.
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