摘要
深层超高温致密碳酸盐岩储层具有埋藏深、温度高、闭合应力高以及非均质性强的特点,常规酸压工艺有效作用距离短、裂缝导流能力下降快,压后产量差异大、措施有效性差等诸多难题.通过室内岩心实验和软件模拟,开展储层地质特征分析、缝网可行性评价、酸压方案优化设计等研究,分析天然裂缝、岩石力学特征、矿物组成、脆性指数以及水平应力差等因素,评价复杂"缝网"形成条件,最终形成了大排量滑溜水造缝、大规模清洁酸扩缝、加砂支撑保持长期裂缝导流能力的缝网酸压技术;同时,以"最大化改造体积"为目标,模拟优化施工排量、用液强度、用酸强度、支撑剂用量等参数.该技术在杨税务潜山应用 3 口井,平均日产气 24.3×104 m3,日产油 39.49 m3,实现深层潜山气藏"少井高产"高效开发,对深层超高温气藏的效益开发具有技术指导意义.
Abstract
Deep,ultra-high-temperature,and tight carbonate reservoirs are characterized by deep burial,high temperature,high closure stress,and strong heterogeneity.Conventional acid fracturing techniques face numerous challenges,including limited effective reach,rapid decline in fracture conductivity,significant variability in post-fracturing production,and overall poor measure effectiveness.Through laboratory core experiments and software simulations,studies,such as analysis of reservoir geological characteristics,evaluation on the feasibility of fracture networks,and optimized designs for acid fracturing,were performed.Factors such as natural fractures,rock mechanics properties,mineral composition,brittleness index,and horizontal stress differences were analyzed to evaluate the conditions for forming complex fracture networks.Fracture network acid fracturing technologies,such as high displacement slickwater for fracture formation,large-scale clean acid for fracture extension,and sand propping to maintain long-term fracture conductivity,were finally established.Additionally,aiming to maximize the stimulation volume,the parameters,such as operating displacement,fluid intensity,acid intensity,and proppant volume,were simulated and optimized.This technology was applied to three wells in the Yangshuiwu buried hill,achieving an average daily gas production of 24.3×104 m3 and an average daily oil production of 39.49 m3.This demonstrated the potential for efficient development of deep buried hill gas reservoirs with"fewer wells and higher production,"providing a valuable technical guidance for the profitable development of deep ultra-high-temperature gas reservoirs.
基金项目
中国石油华北油田分公司科研项目(2023-HB-D05)
NETL
NSTL
万方数据