| At present, Puguang gas field is the largest carbonate gas field in China as well as one of the most important energy development projects. In recent years, the exploration and development of the main gas field have achieved a great deal of information, but the influence of the edge/bottom water on gas reservoir development is still not clear. In order to take precautions against adversely influence of the bottom water on the gas reservoir development, it is necessary to ascertain the storage and distribution of the edge/bottom water, to establish the distribution model of the edge/bottom water, to find out the dynamic characteristics and its effects on development of the edge/bottom water, and to forecast the dynamic development characteristics of gas reservoir, providing a reliable evidence for optimizing the development mode of the gas field. And all these are based on recognizing the reservoir distribution features and the complex relations of water and gas. This plays a vital role in maintaining the stable production, improving the ultimate recovery of gas and our Sichuan natural gas transmission-to-east project.Based on the basic geological features of the gas field, the effect of the edge/bottom water on the development of the gas reservoirs is studied by adopting the gas reservoir engineering and the numerical simulation methods. On the demand of the in-situ actual production, this paper have carried the following research work and achieved the corresponding research results:①.Through extensive literature inquiry and research, the present study situation of the production performance of high sulfur reservoir and the effect of bottom water on the gas reservoir is concluded. The production dynamic laws of high sulfur gas reservoir, the bottom water model and the water encroachment identification method lay the theoretical foundation for this paper’s future work.②.Analyzing the basic geological characteristics of Puguang gas reservoir, it shows that both the water invasion initiation conditions and the water invasion initiation factors exist; at home and abroad, the related materials of six typical developed gas field partly similar to Puguang gas reservoir are analyzed, so the development dynamic characteristics of high sulfur edge/bottom water gas reservoir are summed up in this paper.③.Using the gas reservoir engineering methods, actual production performance and the effect of the producing water state and water cut on gas production is studied, it indicates that the current production water is mainly condensate water, and once the water production is greater than the condensate water’s, the production of gas well will be seriously effected.④.Using the available information of gas reservoir, establish the detailed tridimensional geological model and the numerical simulation model is built. Using the ECLIPSE software, the influence of the edge/bottom water and gas velocity on development is inquired, and the production features of gas wells are also analyzed, it is determined that the reasonable gas rate of the gas reservoir is 4～4.5%. ⑤.Using the modified "one point method" to calculate the absolute open flow of 30 wells, combined with the features of gas production and water production, five single well production allocation programs are identified and it is determined that the scheme 1 is the basic production allocation program for optimization by numerical simulation. On the basis of scheme 1, it ultimately gives the best gas production allocation scheme through numerical simulation demonstration. |
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