The Study On Development Law And Effective Drive Strategy Of Horizontal Well In Bottom Water Reservoir

Horizontal well development technology has been widely used in various types of reservoirs.It plays an effective role in the productivity of newly developed oilfield and the adjustment and excavating of the old oil fields.The horizontal well has been widely used in bottom water reservoirs at home and abroad because of it has larger oil discharge area and smaller production pressure.However,in the process of the development of oil and gas fields with horizontal wells,the unbalanced development condition of horizontal wells severely restricts the exploitation results of horizontal well.Therefore,providing a set of effective methods to obtain the development condition of horizontal well section is necessary.First of all,well testing method is adopted in this method to obtain the effective development length,geological parameters of horizontal wells and dynamic development parameters.Subsequently,the numerical model is proposed to establish the geologic model of the well circumference which is used to simulate the development of the block where the target well is located.By combining well testing method with reservoir engineering methods,the development condition of horizontal well section of the target well is obtained.The results show that the development condition of horizontal well section is closely related to the property of the reservoir,the structure of horizontal well and the rate of horizontal well.In homogeneous model,the horizontal well condition of the horizontal well shows a good difference between the two ends.The horizontal well section is most uniform along the horizontal section when the reservoir property is good at both ends.The development of the interlayer has obvious blocking effect on the rise of bottom water ridge.When the interlayer is far away from the horizontal well,the bottom water breaks through the barrier and breaks through the horizontal well into the bottom of the well.When the interval is closer to the horizontal well,the position of the bottom water breakthrough is changed.The distance between the interval and the horizontal well is not conducive to the uniform utilization of horizontal wells.In addition,the ratio of horizontal permeability and vertical permeability,oil and water viscosity ratio,horizontal well length,and horizontal well recovery speed are all through changing the coning velocity of bottom water and changing the moving condition of horizontal well.The higher the ratio of horizontal and vertical permeability,the smaller the viscosity ratio of oil and water,the longer the length of horizontal well and the smaller the speed of the horizontal well,the more uniform the moving condition of the horizontal well,the higher the final recovery rate of the block.For Lu 9reservoir,It is better to add artificial interlayer to control water and control the yield of horizontal well in 20 m~3/d.The finger of horizontal well is seriously out of water,it should be selectively blocked.