Research On Water Incursion Law Of P Gas Reservoir And Deliverability And Rational Proration Of Gas Wells

Sour gas reservoir with edge water occupies a large proportion in china,which commonly has rich reserve.The influence of water incursion on the development of gas reservoir with edge water is the eternal and crucial research topic.Based on the fully investigation of the related literatures,the thesis took P gas reservoir as example to completed some researches,including the comprehensive analysis of water incursion law of the overall reservoir,the-calculation of the bottom hole flowing pressure and the deliverability and rational proration of gas wells.Then some conclusions have been drawn.On the basis of mechanism of water incursion and the analysis of the dynamic production data of gas wells,the producing water gas ratio was established as the identification basis of the early water incursion.The water incursion regularity was concluded by analyzing the water gas ratio change of all wells-the active edge water advanced from west to east toward the high part structure,and the speed of water advance in the south region was faster than that in the north.What's more,the physical parameters of the high sulfurous natural gas were calculated by several conventional empirical equations.And the results were compared with the PVT experiment for the optimization of the calculation methods for the compressibility factor.Based on the pressure drop equation in the wellbore,the methods of calculating the bottom hole pressure were established.Then the equation to predict the sulfur deposition saturation in the layer was deduced.The apparent skin factor was used to estimate the gas well deliverability damage from the sulfur deposition.The result shows that the influence of sulfur deposition to the deliverability is very little,which can be neglected.Two kinds of deliverability interpretation methods for the conventional production wells were established.The gas-water two phase generalized stress was defined and the deliverability equation of the high water gas ration well was deduced based on the gas-water two phase percolation mechanism.Then the water incursion damage to well production was estimated.Finally,production proration methods were studied,including critical flow rate of carrying liquid,gas productivity curve analysis and node analysis of production system.The researches in this thesis provide theoretical foundation for the water control measure and the adjustment of wells production,which is in favor of the rational exploitation of highly sour gas reservoirs with edge water.