大涝坝凝析气藏循环注气量预测

Prediction of cyclic gas injection volume in Dalaoba condensate gas reservior

陈英超 张奎 王汉

Chen Yingchao Zhang Kui Wang Han

中国石化 西北油田分公司 雅克拉采气厂, 新疆 库车 842017

Yakela Gas Production Plant, SINOPEC Northwest Company, Kuqa, Xinjiang 842017, China

大涝坝凝析气田属于深层高温高压、高含蜡、高含凝析油的边水凝析气藏。衰竭式开发过程中，受反凝析和水侵的双重影响，产能快速下降，为提高采收率，开展循环注气开发。由于大涝坝气藏属于开发中后期开展循环注气，为确保循环注气采收率及经济效益，通过模拟方法，针对大涝坝水驱凝析气藏，开展注气后凝析油含量变化与累产油、气关系曲线的研究，确定在2029年凝析油的含量降为100 g/m3，此时累计注气量为24.65×108 m3，可采地质储量在经济条件下达到最优，从而保证循环注气开发效果。

The Dalaoba condensate gas reservoir belongs to the deep condensate gas reservoir with edge water of high temperature and pressure, high wax content and condensate content. During the process of depletion deve-lopment, retrograde condensation and water invasion often occur, resulting in the sharp decline of gas well productivity. Cyclic gas injection is applied to enhance gas reservoir recovery. Since cyclic gas injection was carried out during the middle-later period of the reservoir's development, for ensuring cyclic gas injection's recovery efficiency and economic benefit, the relationship was analyzed through simulation method between condensate content changes and cumulative oil and gas output after implementing gas injection for water-drive condensate gas reservoir, such as Dalaoba condensate gas reservoir. It was determined that condensate oil content would drop to 100 g/m3 in 2029, and the cumulative volume of gas injection would reach 24.65×108 m3 at that time. The exploitable geological reserves would be optimized under economic condition, thus ensuring the development effect of cyclic gas injection.

https://doi.org/10.11781/sysydz2016S1027