Research Of Draninage Gas Recovery For Gas Well Used In Offshore Oil And Gas Field

Nowadays in the offshore oil and gas production platform, a permanent packer tubing string structure is used for the gas well in accordance with safety requirements of the offshore oil and gas production. Filled with preservative liquid in the tubing-casing annulus above the permanent packer set, this particular production structure keeps a good protection for the casing string from corrosion. However, this structure can't establish an effective channel of circulation between the pipeline and tubing-casing annulus. Without the circulation, which is completely necessary for the production, there is huge problem for the successful implementation of long-term stabile production and the increase of the productivity. In order to ensure the stable development of oil and gas wells after the well encounters water, the research of effective dewatering gas production technology and appropriate tubing string structure are needed, which two aspects will also extend the productive life of gas wells.After researching on the numerical simulations and history matching of the existing gas reservoir and production wells this study, taking the high-pressure gas as the power source, chooses the multi-phase flow formula which is suitable for the pressure of the well borehole and temperature distributionThis study demonstrates the feasibility of using gaslift technology to dewater the gas by analyzing the adaptation of the reservoir conditions, the feasibility of oil production and the implementation of engineering. Considering the tubing string structure of production wells should be fixed in the tube column, and then adapt to meet the entire period of gas production system and process changes, this study, on the basis of predicting index of the panning development and the theoretical calculations data, after researching whether the water amount can meet the needs of continuous lifting, brings to the completion tubing string structure of the gas well, and different design methods according to the changes of water amount.With the advantage of a simple process design and long-term exempting from repair, it completely uses its own high-pressure gas of the field, achieves a smooth way to product oil, and effectively extended the life of exploitation. At the same time, the popularization and application of gas-lift gas dewatering technology, can not only fulfill the the completion of oil production, but also can achieve energy-saving reduction, reduce costs, improve production efficiency, and achieve the object of efficient and smooth development of the oil and gas oilfield.