Application And Study On The Well Testing Analysis Method In The Low Permeable Gas Reservoirs

Well testing analysis technique is a very important method and basis to realize and evaluate the reservoirs as well as dynamic production monitoring. By means of reasonable gas well testing analysis, we can familiar and know gas reservoirs' characteristics, predict its productivity and realize its dynamic production so as to exploit the gas reservoirs effectively. The purpose of this paper is to study and apply the well testing analysis technique in the low permeable reservoirs.With the development of the new gas reservoirs production techniques, lots of low permeable reservoirs put into production and many well testing data have shown the non-Darcy flow law. So we must analyze and illustrate the non-Darcy flow mechanism and set up the related interpretation models to evaluate the gas well testing data in the low permeable reservoirs. Then we can evaluate the low permeable reservoirs at the early stage, define the formation pollution, formation parameters and its productivity to guide the gas reservoirs production.The paper has fully studied the non-liner flow characteristics, geological flow model, mathematical model and comprehensive low permeable well testing analysis model in the low permeable reservoirs. Especially for the comprehensive well testing interpretation in the low permeable, low velocity non-Darcy flow, the paper has used the new mathematical processing method to establish the mathematical models of the face infinite formation, double media infinite formation, round hermetic formation, round fixed pressure formation and models with faults. Furthermore, the new interpretation sample curves, double pores media and multi-media low permeable, low velocity non-Darcy flow law sample curves which are applicable in the low permeable gas reservoirs have been developed to enrich the comprehensive low permeable well testing analysis theory, which has provide the basis for realizing, evaluating the low permeable gas reservoirs' productivity and for exploiting the low permeable gas reservoirs efficiently. The paper has the significant importance to guide the reservoirs production with the similarities of the Daqing peripheral oil and gas field. The method can be used in the peripheral oil and gas fields in Daqing extensively and achieve the economical and social benefits.