Seepage Characteristics of High Production Deep Water Reservoirs
The pore pressure distribution around an injection or production well is of great importance to petroleum engineers in such areas as formation evaluation, fluid flow analysis and well drilling design etc. Well testing is one of the widely used methods to obtain it. In order to gain an accurate pressure, its fundamental theory should describe the seepage characteristics correctly. However, the non-Darcy flow is usually neglected for the assumption of creeping flow. For deep water reservoirs, such as Gulf of Mexico, Brazil, West Africa (Angola, Nigeria), in order to improve development efficiency, it should drill very few wells with high productivity to reduce investment and shorten payback period. When single well production is very high, the highvelocity non-Darcy flow will occur in the near wellbore zone. Based on lzbash equation, a non-linear flow model is established which combined Darcy and non-Darcy flow in the reservoir. A methodology to solve the diffusion equation with combined flow patterns is proposed. The solution technique, which is based on Boltzmann transform, is very suitable to solve the analytic solution of pressure distribution. After analyzing the typical curves of bottom-hole pressure and pressure derivative, seepage characteristics of non-Darcy flow and its influence factors are determined. All factors, such as integrated non-Darcy coefficient combined by formation permeability, porosity and fluid property, power index and so on are discussed. The research result can be used to provide theoretical basis for well-testing interpretation and productivity evaluation in deep water reservoirs.
Deep water reservoirs High production with larger well spacing non-Darcy flow in Porous Media coupled theory
YAO Yuedong FU Libing
MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing, China, 102249
国际会议
成都
英文
197-203
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）