Comprehensive Methods For Identifying The Location Of Water Breakthrough Of Horizontal Well Of The Edge-bottom Water Reservoir

With the bottom pressure of oil wells decline,the horizontal wells are prone to occur water coning.The existing well testing analysis methods do not take into account the nonuniform production of horizontal wells,and have not been able to effectively determine the location of high production of horizontal wells.Nowadays,there is no effective method to diagnose the location of high production of horizontal wells.This article analyzes the flooding law of horizontal wells in a typical block;establishes a number of simulation models of the reservoir,analyzes the influence of interlayers,well trajectories and other factors,summarizes the distribution pattern of interlayers,and analyzes each variation characteristics of the water content and its derivative curve of horizontal wells in the distribution mode,a method to eliminate small fluctuations in water content and its derivative curves is proposed,and a method for finding water in horizontal well reservoir engineering is explored.The bottom hole pressure solution considering skin and well storage is obtained.Typical curve characteristics of well tests are analyzed and sensitivity factors analysis are carried out.When bottom water exists in the lower part of the oil layer,the pressure derivative curve of the irregular production well test model shows a linear flow stage;this lays the foundation for diagnosing the location of high production of horizontal wells.When the bottom water energy is particularly strong or the vertical permeability is large,There is no linear flow section,and the position of high production of horizontal wells cannot be diagnosed.The correctness of the model is verified by comparing with the existing well test model of commercial software.Using the model of this paper to explain field examples,the curve fitting effect is good,the interpretation result is reasonable,and the interpretation result provides an important basis for identifying the location of high production of horizontal wells and formulating development adjustment countermeasures.