塔河油田九区碳酸盐岩[]缝洞型凝析气藏开发技术探讨

Exploration technology for fractured-vuggy condensate gas reservoirs in block 9 of the Tahe Oil Field

张伟

Zhang Wei

中国石化西北油田分公司采油一厂, 新疆轮台 841600

No.1 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xingjiang 841600, China

塔河油田九区奥陶系为碳酸盐岩缝洞型凝析气藏,它具有较强的非均质性,多相流体渗流机理不符合达西渗流规律,气井具有"高压、高含蜡、高含H2S、高凝固点"四高的特点,当前缺少成熟的开发理论和技术。经过近两年的探索实践,通过无阻流量法、二项式产能切线法、气井差异对比法等多方法结合,确定了缝洞型凝析气藏气井合理采气量,提出适合进行降压开采的开发政策;针对"四高"问题形成了优化流速、改进高压机械清蜡工艺、段塞式正注3种防堵技术,改善了缝洞型凝析气藏的开发效果。

The Ordovician fractured-vuggy condensate gas reservoirs in block 9 of the Tahe Oil Field are characterized by complex reservoir geology and complicated seepage flow law of multi-phase fluid through porous media. The gas wells have high pressure, high paraffin content, high H2S content and high setting points. Currently, there are few mature exploration experiences and techniques for reference.After two years' practice, several methods such as open-flow potential, binomial production equation as well as divergences comparison bet-ween gas wells are used comprehensively. The reasonable gas production rate per well in fractured-vuggy condensate gas reservoirs was determined and a depressurizing development strategy was established. Meanwhile, three anti-blocking technologies involving fluid velocity optimizing, modified paraffin removal mechanical tech-nology under high pressure and positive injection of fluid slugs were proposed. Thus, the development effect on fractured-vuggy condensate gas reservoirs has been successfully improved.

https://doi.org/10.11781/sysydz2015S1066