Orthogonal Numerical Test of Injection and Production Parameter Optimization for Nitrogen Foam Anti-Water-Coning

Nitrogen foam anti-water-coning is one of effective technologies to control water-coning. The key to obtain good anti-water-coning results is to choose suitable injection and production parameters. There are many injection and production parameters influencing the anti-water-coning results, and orthogonal numerical test is one of effective ways to solve these problem. In this paper, the orthogonal experimental design has been conducted on the basis of the principles of orthogonal numerical test design, by consid-eration the following seven injection and production parameters, including injection volume, injection rate, injection mode, gas-liquid ratio, shutdown days, daily fluid production rate and time of water injection. The ratio of input to output can be used as evaluation index for orthogonal numerical test. On the basis of history matching, orthogonal numerical test and numerical simulation have been finished with nitrogen foam anti-water-coning technology. The study results show that injection volume, daily fluid production rate and time of water injection have significant influence on injection and production parameters of nitrogen foam anti-water-coning. The significant order of parameters are injection volume, daily fluid production rate, time of water injection, gas-liquid ratio, injection mode, injection rate and shutdown days. The results of orthogonal numerical test can provide a theoretical guidance for injection and production parameter optimization with nitrogen foam anti-water-coning technology, and is very significant for practical application.