强底水油藏水平井见水时间及水锥动态研究

底水锥进是影响底水油藏水平井开发效果的重要因素,其中水锥形态和水锥突破时间是底水锥进的关键参数。基于底水油藏水平井下部为半圆柱状向心流的假设,推导出水平井见水前在任一时刻的水锥高度隐函数,进一步确定了底水油藏水平井的水锥突破时间和不同时刻水锥形态。结果表明,水锥突破时间主要与避水高度、水平段长度正相关,与水平井初期产量反相关,且随着时间的延长,水锥半径越来越大。将计算结果与渤海油田底水油藏一口水平井生产实例进行比较,两者误差在10%以内。

Breakthrough Time Prediction and Water Coning Shape Dynamic Simulation of Horizontal Well in Strong Bottom Water Reservoirs

Bottom water coning is an important factor influencing the development effect of bottom water reservoir by horizontal well. The water coning shape and breakthrough time are key parameters of bottom water coning. There is a hypothesis about the percolation below the lateral segment of horizontal well, that is semicircular cylinder flow. Based on this model, an implicit function is derived, which is for water coning height at any time in any radius away from the vertical line between the lateral segment and WOC. Thus, the bottom water breakthrough time and water coning shape at different time can be conducted and they are related with water avoidance height, horizontal section length and initial potential. The calculation error is less than 10% compared to Bohai oilfield production practice.