深层洞穴型油藏改建地下储气库的可行性

Feasibility of reconstructing deep cave reservoir into underground gas storage

为了研究深层洞穴型油藏改建地下储气库的可行性,以洞穴型油藏地质特征为基础,通过MATLAB编程计算注入压力,分析深层洞穴型油藏改建地下储气库的可行性,推导建立库容预测数学模型,并通过物理模拟实验验证库容预测数学模型的可靠性。研究结果表明:洞穴型油藏改建为储气库具有一定的可行性,但对地面注入压力条件要求较高,地面注入压力上限为45 MPa,日注气量为10×104m3时最优;物理模拟实验可较好地模拟洞穴型油藏注气采油过程,并可形成储气库;实验库容大小与数学模型计算结果误差较小,所建库容计算模型具有一定的可靠性。

In order to study the feasibility of reconstructing deep cave reservoirs into underground gas storages, program in MATLAB programming was made to calculate injection pressure, derive and establish prediction mathematical model for storage capacity based on the geological characteristics of cave reservoirs, and physical simulation experiments were conducted to verify the reliability of mathematical model for storage capacity prediction. The results show that reconstructing deep cave reservoirs into underground gas storages is feasibile to some extent, but the requirement in injection pressure is strict. The upper limit of injection pressure is 45 MPa and the best gas injection rate is 10×10^4m^3 per day. The physical simulation experiment can simulate the process of gas injection and oil production in cave reservoirs, which can form gas storage at the same time. There is little error between storage capacity in the experiment and the simulated result from mathematical model, suggesting that the storage capacity mathematical model has a certain degree of reliability. （7 Figures, 6 References）