Studies of the Optimum Water Avoidance Height and the Reasonable Length of Horizontal Well in Bottom Water Reservoir

Bottom water coning is the biggest problem in the exploitation of bottom water reservoir,which prohibits the valid exploitation of horizontal wells.Green function and source function are used to find the semi-analytic expression of the pressure distribution of the horizontal well in bottom water reservoir,and the critical production formula and water breakthrough are obtained time formula.The influence of avoidance water height and horizontal section length on water breakthrough time and critical production was analysised,ascertain of the water avoidance height from the bottom water reservoiv and the horizontal section of reasonable length.This research provides the theoretic guidance enhances the effective exploitation of the horizontal well and economize the cost of mining.