缝洞型碳酸盐岩凝析气藏注水开发物理模拟研究

Physical simulation of exploiting fractured-vuggy carbonate gas condensate reservoirs by water injection

彭松 郭平

Peng Song Guo Ping

“油气藏地质及开发工程”国家重点实验室, 西南石油大学, 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China

与一般砂岩凝析气藏不同，缝洞型碳酸盐岩凝析气藏发育有大小不同、形状各异的裂缝和孔洞，使其具有非均质性强，流体流动规律复杂等特征。如何提高该类气藏的采收率是值得研究的问题。技术成熟的注水技术具有开发成本低、水气流度比好、水驱波及效率高等优点。以塔中86井为例，采用露头碳酸盐岩经过人工技术制成全直径缝洞型岩心，在原始地层条件下(140.6 ℃，58 MPa)完成注水开发物理模拟实验。结果表明，采用注水保压方式开发高含凝析油的缝洞型碳酸盐岩凝析气藏效果较好；凝析油的采收率受缝洞连通方式、缝洞充填与否、压力保持水平等因素的影响。

Due to the development of fissures and cavities with different sizes and shapes, fractured-vuggy carbonate gas condensate reservoirs are distinct from the general sand gas condensate reservoirs, hence are characterized by strong heterogeneity and complicated flow regularity. To these reservoirs, it is a question of concern that which developing strategy is benefit to maximize the recoveries of oil and gas. As a mature technology, water injection possesses advantages such as lower cost, better gas-water mobility ratio, and higher sweep efficiency. Taking well TZ86 as a target, we accomplished a physical simulation research under initial reservoir conditions (140.6 ℃,58 MPa) by using an artificial fractured-vuggy full-diameter core which was made from an outcrop of carbonate rock. The experimental results show that the effectiveness of exploiting fractured-vuggy carbonate gas condensate reservoirs by water injection is significant. The factors such as the connectivity pattern between fissure and cavern, the pressure maintenance level of water injection, and cavern whether or not filling have effects on the recovery of condensate oil.

高校博士点基金“高温高压多组分凝析气非平衡相态理论模型研究”(20115121110002)资助。

https://doi.org/10.11781/sysydz201405645