Analysis On Critical Production Of Low Permeability Gas Field Development And Its Application

In the recent years, it has been explored that there are highly90%low permeability gas reservoir in the natural gas reserves in China and its proportion has raised up gradually year after year. As a result of it, it has become urgent that exploration and development have focused on the low permeability gas reservoir. If the production of natural gas increases for the investment and cost increases greatly, the profits of unit production of natural gas will definitely decrease even loss, which damaging the profits of natural gas companies. Under this circumstance, it will be less if the production of natural gas is higher. In order to explore low permeability gas reservoir more economically and efficiently and satisfy targeting revenue for these companies, it has been essential that economic critical production has been studied deeply in the exploration of low permeability gas reservoir, while enhancing exploration quality and management of these companies.After analyzing different characteristics, investment costs, natural gas constitute and vibration in the different exploration period, there are economic critical production models for the natural gas in the four steps of low permeability gas reservoir exploration, such as preliminary stage, middle stage, middle-later stage and later stage, which combining with practical business conditions for the companies, introducing capacity calculation coefficient and capacity building and other economic indicators critical value, and applying net present value method, marginal analysis and dynamic break-even analysis. All these models have been applied in the practical production of N gas field. The model of each stage has absolutely contained all sorts of economic indicators such as price, production, operation costs, investment, business tax and surcharges and commodity rates, which making the results of calculations match the real ones. These models could not only calculate economic critical production of natural gas in the different stages, but also can analyze sensibility of several economic parameters such as price, base earnings ratio and operation costs. It has been remarkable for gas exploration companies that low permeability gas field has been researched deeply for acquiring maximum profits, reducing production and investment cost, enforcing reservoir operation and management, and improving the ability of organizing production and investment decision.