Determination of proper bottom-hole fluid pressure for low-permeability and high gas-to-oil ratio wells

To low permeability oil wells,proper bottom-hole fluid pressure is a key to the high and stable yield of the wells.The steps for determining the proper bottom-hole fluid pressure of the wells are proposed.Firstly,the liquid yield of the well is calculated according to the inflow performance of oil-gas-water three-phase flow at well bottom.And then,it is modified by fitting coefficient and oil-well perfect coefficient.Lastly,the proper bottom-hole fluid pressure is determined by means of the static and dynamic parameters of the oil well and the pressure sensibility property of the low permeability reservoir.The calculation of a case shows that the bottom-hole fluid pressure determined by this method is of universality and high accuracy.