Research On Production Technology Of Remaining Gas In Su10、Su11 Area

With the development of Su10 and Su11 block, several problems appear such as low contral reserves of vertical and single wells, low production and inefficiency of gas wells, a sharp decline in formation pressure, the increasing of low production wells and the poor development effect of partial horizontal wells.According to the production status of Sue 10 and Sue 11 block and the study of low yield in the changqing oil field at home and abroad,we select the typical low production and inefficiency wells to analyze the reasons about these two block. Finally, we determine the main reasons of the low production and inefficiency problem in five aspects and provide the basis for further measures; At the same time, we depict the remaining gas distribution rule in the studied area with the mall layers of oil gas reservoir sand body, the reservoir plane distribution, the small layers of sedimentary microfacies and the change of porosity and permeability, building the foundation of lateral drilling arrangement and selectionConsidering the characteristics of gas reservoir, the present situation and the low production and inefficiency well synthetically, we need to tap into the potentials of old wells, evaluate and analyze the sidetracking horizontal wells, repeated fracturing wells and tone up wells in the area.Through the analysis of the distribution of residual gas and all kinds of well production rule, we conclude that the output of gas wells fall with the extension of production time, a considerable part of the gas reserves output is mined at low pressure stage. So we need to strengthen the management of old well, make reasonable measures of tapping the potential of the low production and inefficiency wells, extend the gas well production cycle maximally, improve reserves producing level. At the same time, the measure of making the corresponding measures countermeasures for different types of low gas well can be popularized in Su Li Ge gas field and other tight gas reservoir, having high reference value to the production and management of unconventional oil and gas.