摘要
Abstract
The western Unit-7 in Gudong oil field is a shallow oil reservoir with loosened consolidation and high permeability. Its depositional cycles are mainly positive rhythm. Sand production occurs during waterflooding. Especially after the enhanced water injection and enhanced production project was carried out, sand production become serious. Very high permeable zone comes into being between wells, which is called wormhole. The mechanism and influencing factors (reservoir permeability, consolidation degree of rocks, fluid viscosity, production rate) of forming wormhole were studied by modeling and doing experiments. Diagnosis and description of the wormhole were done by using the production data because of high cost of tracer. The interrelation between different factors was calculated by using Gray theory to diagnose the existence of the wormhole; and parameters of the wormhole (direction, depth, permeability, size of throat, etc.) are worked out by use of simplified math model. All above-mentioned functions are carried out in the software. This software is applied to the explanation of information from oil/water wells (totally interpreted 290 wells/times and 42 wells/units) in western Unit-7 of Gudong oil field, and wormholes are found out in 124 wells. The result is identical with that of the tracer experiment in pilot test unit. This software is characterized by low cost, convenience and practicality.关键词
高渗透储集层/出砂/高/孔隙喉道/实验室/物理模拟/机理/生产统计/灰色系统/井下诊断/参数/计算机程序Key words
Stochastic process/Numerical simulation/Sedimentary facies/Control/Reservoir model/Optimization/Mathematical model/Well data/Inspecting分类
能源科技
