Analyze of some complications taking place reasons while exploitation of gas showing jacks

The last phase of field exploitation is generally characterized with low layer pressure, bottom hole zone disfunction, sludging and so on. In order to eliminate this or other complication it is necessary to investigate the factors causing this process. The gases in field productive series enter into the bottomhole zone together with the liquid. This is dissolved gas and generally layers functioning in mixed regime. Both of oil and gas move in porous medium together, but as it is known, the medium permeability is different for each phase and is defined by the phase permeability curves. The fact that there is free gas in the pores influences the rock permeability in comparison with oil (liquid). This takes place due to gas rock sticking in the pores and preventing the liquid movement. It is necessary to note that in the degree of porous medium water saturation oil viscosity correlation to water viscosity ) affects the oil content in liquid flow. It is also necessary to know that as a general rule in the old oil fields there is a three-phase movement and bottom hole pressure decreasing excessively causes oil degassing and this in its turn, increases oil viscosity and consequently, ) correlation too. As a result, oil decreases in the liquid taken in the same quantity. So, in order to remove the gas-sand showing it is necessary to give special attention to operation regime optimization.