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本报告论述了在一口水平井中,对一个两层气藏所获得的压力恢复数据的解释。该水平井所钻到的岩层是粒状灰岩,上覆于一厚层低渗透性的白云岩之上。为了确定井筒和气藏的一些性质,实施了措施前的压力恢复试井。所获参数是,水平井段的有效长度,表皮效应和单层水平渗透率和垂直渗透率。分析解释主要依赖于双对数压力和导线曲线,来确定储存系数和传导率的重要变化以及分离出适当的数据段进行直线分析。特别要强调的是,在压力导数计算中专门考虑了开采速度变化的影响。在本文献中发表的方程用于计算不同流动状态的开始和结束,从而获得所需参数,以提供分析的一致性和可靠性。压力恢复数据表明的特征与层状系统理论是一致的。虽然早期存储系数增大,受上层高渗透性地层的影响,但终究还是整个系统作用的结果。由于在分析中作了总体考虑。就可能得到有效的所需参数。从结论看出,为产量作出贡献的水平段小于井筒长度,而且对地层的伤害是很轻的。分析计算出的渗透率与从岩心、模型、邻近井筒的试验所获数据结果是一致的,并且表明两层气藏有长期排流的可能性。
This report addresses the interpretation of pressure recovery data obtained in a two-layer reservoir in a horizontal well. The horizontal well drilled was grained limestone overlying a thick, low permeability dolomite. In order to determine some of the properties of the wellbore and gas reservoir, a pressure recovery well test before the measure was implemented. The parameters obtained are the effective length of the horizontal well section, the skin effect and the horizontal and vertical permeability of the monolayer. Analytical interpretation relies mainly on double logarithmic pressure and wire curves to determine important changes in storage and conductivity, as well as to isolate the appropriate data segments for straight-line analysis. In particular, the impact of changes in production rates has been specifically considered in the calculation of pressure derivatives. The equations published in this document are used to calculate the start and end of different flow regimes to obtain the required parameters to provide analysis consistency and reliability. Pressure recovery data show that the characteristics of the layered system theory is consistent. Although the early storage coefficient increases, affected by the high permeability of the formation, but after all, is the result of the entire system. Due to the overall consideration in the analysis. It is possible to obtain the valid required parameters. From the conclusion, it can be seen that the horizontal section contributing to the production is smaller than the length of the wellbore and the damage to the formation is very light. The calculated permeability is consistent with the data obtained from the tests of the core, model and adjacent wellbores and shows the potential for long-term drainage of the two gas reservoirs.