High Moisture Content Post-reservoir Alteration Of The Percolation Mechanism Of Gas Storage And Applied Research

To guarantee the economy rapidly developing, the energy strategic projection(delivery west gas to east, absorbing Russian gas north and delivery Sichuan and Chongqing gas to HuBei and HuNan provinces) needs to establish some gas storages in middle ,east and littoral zones, while parts of the oil fields in middle and east zones are developed by the method of water injection, nowadays producing fluid in those fields has high water saturation, and those field have the better conditions to establish gas storages, they will become the potential structural to build gas storages.This paper first simulates the percolation specificity in high water saturation formation under multiple establishments , injecting and producing conditions by means of physical analogue; and studies the mechanism of lots of factors affecting the storage capacity, injection-production ability; the research results are as following:(1) in high pore and permeability formation or in homogeneous formation, storage capacity rise with the rise of injecting gas speed;(2) when establishing gas storage in high water saturation later oil field with active edge water, the water-gas mutual flooding experiments suggest: the gas-liquid biphase region becomes strictured , it shows that the mutual flooding times rise, the gas percolation ability declines; it is better to establish gas storage in blocked reservoir than in reservoir with active edge and bottom water;(3) the 8 times water-gas mutual flooding experiments in high water saturation later blocked oil reservoir shows that: the mutual flooding times rise, the storage capacity and gas percolation ability accrescence; and in later experiments, the storage capacity and gas percolation ability rise slowly;(4) during the process of multiple injection-production in gas storage, the high permeability layers are more sensitive to pressure varity than lower ones; but with the injection-production times rising, the stress sensitiveness declines and the productivity changes little;(5) the microscopic flow experiments shows: gas floods fluid in high water saturation and large tilt angle oil layer, in experiment infancy the gas phase overlaps liquid phase, the gas-liquid interphase is not uniform;(6) screen the addresses to establish gas storage among lots of high water saturation later oil fields on the base on fuzzy hierarchical analysis, the method can effectively solve the compositive appreciative project related multifactor, multilayer and multi objects;(7) appraise and study the practical oil field and forecast dynamical index of multiple programs to establish gas storage ,the results show that establishing gas storage in high water saturation later oil field has favourable prospect.The research of percolation mechanism and application about gas storage shows that the first improved physical analogue method to research percolation mechanism of establishing gas storage in high water saturation late oil field has high theory exploration sense and application value.