低渗薄层油藏压裂开发技术经济界限

摘要

低渗薄层油藏开发难度大，实施压裂改造投资高、风险大。因此，在进行压裂开发之前要评估压裂的经济可行性，同时为方案优选提供依据。采用油藏数值模拟方法和经济学中的盈亏平衡分析原理，确定低渗薄层油藏合理压裂开发的渗透率经济界限和有效厚度经济界限；并应用正交分析方法，对油价、井距、开采年限等进行敏感性分析，确定各因素对经济界限的影响程度。只有确定了各项开发指标的经济极限点，才能有的放矢地对低渗薄层油田开发实施合理的管理。得到以下结论：对渗透率经济界限影响最大的是生产年限，其次依次为有效厚度，油价和井距；对有效厚度经济界限影响最大的是渗透率，其次依次为井距、生产年限和油价；各影响因素与经济界限呈反相关，随影响因素值增大，经济界限值减小。%Due to the difficulties in developing low permeability and thin-layer reservoirs, and high investment and great risk in fracturing, it is necessary to evaluate economic feasibility before fracturing development and provide basis for the plan optimization. Reservoir numerical simulation method and breakeven analysis in economics are used to determine the permeability economic boundaries and effective thickness economic boundaries of the rational fracturing development of low permeability and thin-layer reservoirs. The orthogonal analysis is used to analyze the sensitivity of oil price, inter well distance and production life to determine the impact of each factor on the economic boundaries. Only by determining the economic limit point can the targeted management of the development of low permeability and thin-layer reservoir implement reasonably. It is proved that the production life influenc⁃es the permeability economic boundaries most, while the following are effective thickness, oil price and inter well distance. The per⁃meability influences the effective thickness boundaries most, while the following are inter well distance, production life and oil price. Each factor is inversely correlated with the economic boundaries, that is, the bigger the influence factor value is, the smaller the economic boundaries will be.