克拉2气田异常高压气藏衰竭开采物理模拟实验研究

SIMULATION EXPERIMENT OF DEPLETION-DRIVE DEVELOPMENT FOR ANOMALY HIGH PRESSURE GAS RESERVOIR OF KELA 2 GAS FIELD?

异常高压气藏的开采与常压气藏有很大的差异。异常高压气藏驱动弹性能量大 ,开采中压力下降可能引起部分储层明显的变形 ,使气藏的开采受到多方面的影响。为此 ,通过衰竭开采物理模拟实验对异常高压气藏的开采动态进行模拟研究 ,可确定气藏在开发过程中的地层压力 (p/Z)与累计产气量 (Gp)之间的关系 ,进而判断利用气藏早期开采数据计算的动态储量是否准确 ,以及开采过程中边、底水水体大小对气藏开发的影响。实验研究表明 ,在不考虑边、底水影响的条件下 ,对克拉 2气田利用早期 p/Z～Gp 曲线外推计算的动态储量误差约为6 .3%。

The production characteristics of anomaly high pressure gas reservoirs are different from normal pressure gas reservoirs. The elasticity drive energy of anomaly high pressure gas reservoirs is much stronger than the others. The pressure drop during recovering may cause the rock metamorphose which will affect on the production characteristics of gas reservoirs in many aspects. With the simulating experiment, the recovering performance of anomaly high pressure gas reservoirs could be simulated. The simulated results could be useful for analyzing the relationship between the formation pressure (P /Z) and the cumulative gas production (Gp), determining if the dynamic reserves of gas reservoirs calculated by the production data during early-phase are correct, and estimating the influence of the volume size of margin and bottom water on the development of anomaly high pressure gas reservoirs. The results of this simulating experiment indicate that errors of dynamic reserves calculated by the extrapolated curves of P /Z vs. Gp during earlyphase is about 6.3% without considering the effect of margin and bottom water in Kela 2 Gas field.