The Late High Water Cut Reservoir And Aquifer Structure Converted To Gas Storage

Natural gas is high quality and clear fuel and material, people put more and more recognition on it. And the consumption of natural gas has non-equilibration, prevailing method of handling this problem is to utilize underground gas storage to shift peaking. At the moment producing fluid has high water saturation in most oil field, and those fields have better conditions to establish gas storages, the transfusion mechanism experimental study of rebuilding gas storage in high water saturation formation has practical purpose.This article study transfusion feature and the capacity of injection and production with physical analogue and node analysis, consider lots of factor that affect the capacity of gas storage, 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 region becomes narrow, 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 increase; 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 change 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 interface is not uniform, which suggest the effect of gravitational displace is indistinct. The increase of gas injection rate result in increase of capacity in closed reservoir, once forming gas injection channel.6. We analysis injection and extraction capability of rebuilding gas storage in high water saturation and aquifer with nodal method, which suggest gas storage volume increase with injection and production frequency upgrade.