Natural gas exploitation go through formation seepage, wellbore flow and surface flow, at the same time, the composition and water cut of natural gas are different, and the whole process is a complex system engineering. Gas test design is suitable for engineering design of natural gas mining industry engineers and daily production analysis and calculation of engineers. In the exploration and development of condensate oil and gas reservoirs, it is necessary to obtain the optimal scheme of gas test through gas test research, and to carry out well testing analysis of condensate oil and gas reservoirs to obtain reservoir parameters, and finally to evaluate the productivity of condensate reservoirs, so as to form a complete gas test analysis system for condensate reservoirs, so that we can understand the actual production situation and the influence of various parameters on production, provide the basis for optimizing various production parameters, make management convenience, predict the future production trend and guide production measures.

Research on the method and system of wellbore nodal analysis for condensate oil and gas wells

Node theory under wellbore coupling flow including: The study of high pressure physical parameters of oil, gas and water, the calculation theory of phase diagram of condensate gas well, the theory of gas-liquid two-phase vertical pipe flow under wellbore condensate, the method of calculating IPR curve of condensate gas well (gas phase), the method of calculating OPR curve of condensate gas well, the calculation of condensate gas liquid capacity, the calculation of erosion flow rate and the prediction of gas well hydrate. Gas well wellbore temperature and pressure distribution calculation, gas well through nozzle throttling calculation, gas well through critical flow calculation.

Research and system development of well testing analysis and productivity evaluation method for condensate reservoir

Condensate gas seepage theory, IPR productivity evaluation and well testing theory research, the contents are as follows: The establishment of condensate gas mathematical model, considering condensate effect definition of pseudo-pressure, dimensionless parameters/equations and boundary conditions, dimensionless equation solution method, dimensionless plot analysis, condensate gas well testing analysis method, formation productivity calculation method, condensate reservoir mathematical model build (reservoir model, geological model, Wellbore model, outer boundary model).

The software development framework design of calculation method and technology. The main contents are as follows:

Software development involves complex calculation (formation, wellbore and throttle valve, etc.), complex data (fluid, formation and well parameters, etc.), software data flow, software data system, software function optimization, output results and so on.

The internal data management of the software based on XML; the parameters needed for software calculation; the formatted output of the software; the core functional algorithm function of the software; the interface of the software and the related algorithm of the output; the graphic display and printing framework of the software; and the partial framework of the software output system.

At present, the gas test design method of condensate reservoir has not been developed deeply domestic and abroad. Through gas test analysis, it is of great guiding significance for gas well productivity prediction and production guarantee to find out the factors restricting gas well production, optimize gas production process mode and recovery factor, compile matching drilling, completion, production increase measure, working system and gas production process scheme. The product realizes a set of processes of reservoir analysis, gas well working system design and productivity evaluation, which provides the basis for gas test design, forms the leading technology to improve oil recovery, realizes the efficient development of reservoir, and has a strong competitive advantage.