The Study On Development Strategy To Keep Gas Pool Stable Production For Carbonate-rock Gas Reservoir With Water

Changqing gas field in Ordos Basin is the biggest gas field in China. It is also a great discovery in petroleum gas industry of China in recent years. From on production in 1997 to 2002, Paleozoic Erathem carbonate-rock gas pool in Changqing gas field has built up accumulative production capacity of 39.8 X 108m3 a year and then has met the demand of using natural gas in some big or middle cities, such as Peking, Sian, Yinchuan Municipality and so on. Up to now, Changqing gas field is undertaking the important mission to supply gas from west to east and to the capital Peking. According to the integrated planning of gas field, a accumulative production capacity of 60 X 10 m a year is going to build up at the end of the year 2003 in Changqing gas field. Therefore, the study on development technique to keep Jingbian gas pool stable production has vital practical significance.In the paper, aiming at the specific problems in the process of enlarging the off-take potential scale of natural gas production and on the basis of widely surveying reference and the systemic analysis of gas field development, the comprehensive research on development strategy to keep Jingbian gas pool stable production has been finished with multidisciplinary technology and methods, such as geology, gas reservoir engineering, numerical reservoir simulation and a variety of mathematical methods. The key of the research is to study and recognize the geologic characteristic of Jingbian gas pool over again with making the most of the date of all new wells and finally accomplish the gas reservoir description with the combination of static and dynamic data and estimate the geologic reserve of natural gas and the recoverable reserves by pressure drop in the gas pool. And then according to the dynamic state rule of gas reservoir development, this paper bring forward the scientific and reasonable technique strategy to keep Jingbian gas pool stable production by means of the studies on hydrodynamic system of gas pool and numerical reservoir simulation for gas field next development.In this paper, for the sake of stable natural gas production of gas pool, a series of study methods and technology suitable for this kind of gas pool which belongs to Paleozoic Erathem lithology-stratigraphic combination trap in Jingbian gas field have been established with multidisciplinary technology and methods based upon the combination of static and dynamic data. This paper has sought for some new ways to study the development technique to keep stable natural gas production for this kind of gas reservoirs.In the thesis, there are some novel discusses and researches. Aiming at the series of geologic features of Jungian gas reservoir, for example complicated distribution of erosion grooves, many types of low relief structures and strong reservoir heterogeneity and so on, the paper establishes for the first time a suit of reservoir fine description approaches which is suitable for the weathering crust gas pool with fracture-pore reservoir space by multidisciplinary technology and methods based upon the combination of static and dynamic data.In this paper, the integrated method of geostatistics with artificial intelligence expert system is first adopted. With the integrated method, the quantitative geologic model of Jingbian gas reservoir has been built.In this paper, the way to takes full advantage of integrating static and dynamic data to study and recognize with care the geologic and developing characteristics of Jingbian gas pool over again has widely referenced significance for the effective development of carbonate-rock gas pool with water in our country, especially for the effective development of all kinds of equipped gas fields in Ordos Basin.