根据水区压力变化特征辨识高含硫边水气藏水侵规律

高含硫气藏产地层水严重影响生产，其安全清洁开发要求准确掌握水侵规律。储层非均质性强的边水气藏通常在某些方向水侵强度更大，表现出局部活跃水侵特征。经典水驱物质平衡分析方法基于全气藏平均地层压力进行计算分析，对局部水侵动态敏感性弱，早期研判和预测这类水侵影响较困难。为此，以水侵通道上水区观察井压力变化分析为重点，研究形成了诊断水侵特征、估算气藏开发全过程潜在水侵量大小的方法。与过去利用靠近水侵前缘的生产气井压力恢复数据分析局部水侵特征方法比较，围绕观察井录取动态资料作分析对气藏生产影响小且测压数据几乎不受生产制度变化的干扰。结论认为，多种方法配合能深入认识水侵规律，增强气藏开发治水提高采收率的针对性。

Identification of the water invasion law in high-sulfur and edge-water gas reservoirs based on the characteristics of pressure variation in the water zone

Formation water invasion will inevitably influence the production of high sulfur gas reservoirs, so it is quite essential for us to know well the regularity of this nuisance, thus to ensure the development of such reservoirs in a safe, clean and highly efficient way. Rather more serious the water invasion occurs in some directions of the edge water gas reservoirs with great heterogeneity which show the characteristic of partial active water invasion. It is rather difficult to judge and predict the said type of water invasion especially at the early stage although by use of the classic water drive material balance analysis method based on the average strata pressure of the whole reservoir which has less sensitivity to dynamic occurrence of partial water invasion. In view of this, focusing on the analysis of the pressure variation of the observation well on the water zone in the water invasion channel, a method is thus developed for diagnosing the symptom of water invasion and estimating the potential water invasion quantity in the whole process of production of a gas reservoir. Compared with the previous analysis method of partial water invasion by use of the pressure data recovery in a gas production well in the advancing front of water invasion, this newly developed analysis method by use of the dynamic data from the observation well has little impact on the actual production and the tested pressure data will hardly be interfered by any change in the production scheduling and control. In combination with multiple methods, the regularity of water invasion will be better known; thereby water invasion will be accordingly controlled to enhance the recovery of gas reservoirs.