低渗透气藏不稳定产能分析方法

Instable deliverability analysis technique for gas reservoirs with low permeability

李源源 王怒涛 黄炳光 罗志锋 张风波

西南石油大学石油工程学院，四川 成都 610500

(Petroleum Engineering Institute,Southwest Petroleum University, Chengdu 610500, China),

低渗透气藏储量在四川盆地占有相当大的比例，但是，由于它普遍具有低孔、低渗的特点，使得启动压力梯度、滑脱效应、水锁效应等因素影响其渗流特征，使其具有与常规气藏不同的渗流机理。低渗透气藏的产能数据资料较难获得，所以，通过日常的生产动态数据来准确得出拟合度较高的产能曲线显得尤为重要。

The reserves of gas reservoir with low permeability in China, especially in Sichuan Basin, hold a considerable proportion. Because it has generally low porosity and permeability characteristics, actuating pressure gradient, slippage effect, water blocking effects and other factors affect the flow characteristics. All of the above factors make it have different percolation mechanism compared to conventional gas reservoirs. It is difficult to obtain the production data for the low-permeability gas reservoirs, so it is especially important to draw out the deliverability curve accurately fit to the real situation through the day-to-day production data.