底水油藏水平井水平段合理位置及长度的确定

底水油藏水平井垂向位置、水平段长度是影响水平井开发效果的重要因素，合理的水平段位置、长度不仅能节约开采成本，而且能使开采效果最好。在前人研究成果的基础上，研究了底水油藏水平井临界产量垂向位置变化的规律，提出了底水油藏水平井段合理位置的计算方法，建立了水平段合理长度数学模型，从而形成了一整套底水油藏水平井优化设计方法。该研究成果在现场中应用效果较好，为水平井开采底水油藏的优化设计提供了理论基础，对于实现水平井的高产稳产及延长无水开采期具有重要的理论和现实意义。

Determination of optimum horizontal section location and length for horizontal wells in bottom water reservoir

The vertical location and the horizontal section length of horizontal wells in bottom water reservoir are the important factors affecting the well production, and the optimum horizontal location and length can not only save the production cost, but also obtain the best production effect. Based on achievement of research before, the author studies the relationship between the critical production rate and the vertical location, puts forward the calculation methods of the optimum horizontal location and builds up the mathematical model of the optimum horizontal length. Thus a new systematic designing method for horizontal wells in bottom water reservoir is established. This research result worked well in the field application, and provides the theoretical basis for the optimization design of horizontal wells in reservoirs with bottom water, with theoretical and practical significance for the high and stable production and longer water free production period.