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对水驱气藏采收率的新认识 ——以南海西部典型水驱气藏为例
New understanding about recovery in water drive gas reservoirs: Examples from typical ones in western South China Sea
彭小东 杨朝强 彭 旋 汪来潮 卢 艳 刘 鑫 刘 凯
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作者单位:中海石油(中国)有限公司海南分公司
中文关键字:水驱气藏 气藏生产指示曲线 物质平衡方程 气藏采收率 动态预测 敏感性分析 南海西部气田
英文关键字:Water drive gas reservoir; Production index curve; Material balance equation; Recovery; Dynamic prediction; Sensitivity analysis; Western South China Sea gasfield
中文摘要: 为揭示南海西部水驱气藏采收率普遍高于行业标准参考范围的机理,基于产水气藏物质平衡动态预测方法,选用 Carter-Tracy 非稳态水侵量计算模型,在考虑产水条件下生产指标动态预测的基础上,开展了水驱气藏采收率影响因素研究,并 结合南海西部水驱气藏生产实践重新认识了水驱气藏采收率。研究结果表明:①水驱气藏采收率与气藏水体半径、水层渗透率、 地层岩石孔隙压缩系数、地层水压缩系数以及气藏埋藏中深呈负相关,与采气速度呈正相关;②排水采气是降低废弃地层压力、 提高产水气藏采收率的首选措施;③高部位布井 + 较高采气速度,有助于渗透率较高的边水驱气藏提高采收率;④地层水中天然 气溶解度较高的水驱气藏,应考虑水溶气加剧见水的风险;⑤浅层水驱气藏采收率,高于同等水体倍数和采气速度条件下的深层 水驱气藏。
英文摘要:For most water drive gas reservoirs in western South China Sea, their recovery is often higher than an industry-standard scope. So, based on a dynamic prediction method of material balance used for water-bearing gas reservoirs, taking dynamic prediction of production index under water production into consideration, some factor affecting this recovery was studied via the Carter-Tracy model for calculating transient water invasion. In addition, combined with some practices in this area, the recovery in water drive gas reservoirs was further understood. Results show that, (1) the recovery presents negative correlation with aquifer radius and permeability, pore and formation-water compressibility, and intermediate burial depth, whereas positive correlation with gas-producing rate; (2) drainage gas recovery is the first choice to reduce abandoned formation pressure and increase the recovery in water-bearing gas reservoirs; (3) deploying wells at structural high and keeping a higher gas-producing rate are conducive to increasing the recovery in high-permeability gas reservoirs with edge water; (4) in the water drive gas reservoirs with high gas solubility, that water breakthrough severely occurs in water soluble gas should be taken into accounted; and (5) under the same aquifer multiple and gas-producing rate, the recovery in shallow water drive gas reservoirs is higher than that of deep ones. Keywords
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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