克拉2气田时间推移试井技术

Time lapse well testing technology in Kela 2 gas field

为解决克拉2气田开发存在的数值模拟模型的选取、见水井水侵模式不明确及未见水井见水风险难预测等问题,系统梳理了历年试井资料,排除井间干扰对试井资料的影响,合理选择试井解释模型、分析储层物性参数变化及产能变化规律,与地质、生产动态、地应力相结合,分析判断见水井水侵模式、评价未见水井见水风险,首次对克拉2气田开展时间推移试井技术研究。选取单孔介质模型,对物性参数解释结果进行产能评价。结果表明,见水井无阻流量下降幅度远大于未见水井,明确了见水井水淹模式,评价了未见水井风险,其中有7口未见水井见水风险较大。时间推移试井技术分析为气田开发对策的调整提供了依据,对类似气田的开发具有借鉴作用。

In order to solve the problems existing in the development of Kela 2 gas field,such as the selection of numerical simulation model,the unclear water invasion mode of water breakthrough wells and the difficulty in predicting the water breakthrough risk of wells without producing water,well test data after eliminating the influence of inter-well interference over the years was systematically summarized in this paper.Meanwhile the interpretation model of well test was reasonably selected and the variation law of reservoir physical parameters and productivity was analyzed.By combining with geology,production performance and in-situ stress,the water invasion mode of water-breakthrough wells was determined and the water breakthrough risk of water-breakthrough wells was evaluated.Time-lapse well testing technology was studied for the first time in Kela 2 gas field.In addition,the single porous medium model was chosen and the productivity evaluation of the interpretation results of physical parameters was carried out.The results showed that the open flow rate decline of water-breakthrough was much larger than that of non-water-breakthrough wells.The water breakthrough mode of water-breakthrough wells was defined and the risk of non-water-breakthrough wells was evaluated.The results showed that 7 wells without water producing were at high risk of water-breakthrough.Time lapse well testing technology analysis provides a basis for the adjustment of gas field development countermeasures and can be used for reference to the development of similar gas fields.