潜山裂缝气藏连续封隔体复合控水实验评价--以HZ凝析气田为例

Experimental evaluation of composite water control for continuous packer in buried hill fractured gas reservoir:a case study of HZ condensate gas field

为了探究潜山裂缝气藏控水机制,以HZ凝析气田HZ26-6-2井参数为基础,通过实验参数设计、潜山裂缝地层设计和连续封隔体工艺设计,完成了底水气藏连续封隔体复合控水实验。研究表明:连续封隔体控水技术延缓了无水采气期,使水体推进更加均匀;不同裂缝形态气藏开采见水时间和采气量略有差别,网状裂缝模型采气周期短、采气速度快;平行裂缝较未采取措施时间延长占比为11.1%,采收率提高13.6百分点;网状裂缝较未采取措施时间延长占比为10.3%,采收率提高14.3百分点。总结了裂缝凝析气藏水平井控水效果的因素:裂缝强导流能力是气藏见水风险的重要控制因素,合理的钻采策略是气藏控水的必要因素。气藏开发更应重视前期控水工艺的实施,后期见水以堵水工艺为主。

In order to explore the water control mechanism of buried hill fractured gas reservoir,based on the parameters of well HZ26-6-2 in HZ condensate gas field,the composite water control experiment of continuous packer in bottom water gas reservoir was completed through experimental parameter design,buried hill fractured formation design and continuous packer process design.The research shows that the continuous packer water control technology delays water-free gas production period and makes the water body advance more evenly.The water breakthrough time and gas production of gas reservoirs with different fracture morphology are slightly different,and the mesh fracture model has short gas production cycle and fast gas production rate.The gas production time of parallel fractures was 11.1%longer than that of the untreated fractures,and the recovery rate increased by 13.6 percentage points.The gas production time of mesh fractures was 10.3%longer than that of the untreated fractures,and the gas recovery rate increased by 14.3 percentage points.The factors influencing the water control effect of horizontal wells in fractured condensate gas reservoir are summarized as follows:the strong conductivity of fractures is an important factor controlling the water breakthrough risk of gas reservoir,and the reasonable drilling and production strategy is an indispensable factor for water control in gas reservoir.More attention should be paid to the implementation of water control technology in the early stage and water plugging technology in the later stage.