底水油藏水平井水脊脊进规律

利用油气藏数值模拟软件，研究了水平井底水突破的位置。根据水平井的产量公式，推导出与垂面径向流的渗流阻力相应的生产压差。假设垂面上的生产压降满足对数分布，可得到考虑重力影响的底水脊进速度公式，并推导出油井的见水时间方程。最后，用实例验证了该方法的可靠性。研究表明，底水首先从水平井中部突破，并且随着生产时间的延长，底水脊进的速度会加快。合理增大水平井的水平段长度和避水高度，可以推迟油井的见水时间。

Water Coning Laws of Horizontal Well Production in Bottom Water Reservoirs

The position of the bottom water breakthrough in horizontal well production was studied by means of the reservoir numerical simulation software. Based on the production formulas for horizontal wells, the production pressure difference corresponding to the vertical plane radial seepage resistance was deduced. Assuming the vertical plane production pressure drop to satisfy the logarithmic distribution, the bottom water coning rate with consideration of effect of gravity can be obtained, by which the equation of water breakthrough time of oil well is derived.This method’s reliability was verified by the case study. The research shows that bottom water breakthrough starts from the middle of horizontal well section, and the longer the production time, the faster the rate of bottom water coning. Reasonably increasing the length of horizontal well section and the height of water avoidance can postpone the time of water breakthrough in oil wells