Research On Formation Damage Diagnosis During The Production

Formation damage has significant influences during the production. Because of complex reasons it is difficult to diagnose the damage. Expert system, which can solve damage problems quickly, has been mainly used in drilling, but it can't solve the problem effectively, so it is urgent to develop a new technique for damage diagnosis during production. According to data analysis and research on mechanism of formation damage, sensitivity degree and fine particle migration, solid invasion, hydration expansion and scaling problem are focused on. Main influencing factors and their relationship with main damage type are found and models with expert system are set up for those damage problems. Also, fuzzy mathematics is used here and the new technique for formation damage diagnosis was propounded with the result from expert system model. Field application indicates that two methods are available for formation damage diagnosis. The damage type, reason and degree can be diagnosed effectively, and proportion of every damage type can be quantitatively obtained by integrating two models. The result is useful for proposing broken down and optimization measures, and it's also important to guide the field operation on production.