Low Penetration Of The Acid Fracturing Of The Dolomite Reservoir In The Physical Model And The Research And Application Of Digital To Analog

This article principally researches the fracture acidizing technology of Carboniferous dolomite reservoir in the east of Sichuan. The universally used leakoff model and fracture three-dimensional extend model are not appropriate for the special reservoir. It is necessary to research a new acid fluid loss model, acid-rock reaction model and crack three-dimensional extend model, which are fit for the special reservoir. Accordingly, this article principally finishes the following content:(1) Research the acid-rock reaction physical model and mathematical model for dolomite reservoir;(2) research the acid leakoff physical model and mathematical model for dolomite reservoir;(3) Research the acidizing fracture three-dimensional extend mathematical model;(4) Research the three-dimensional acid flow and acid-rock reaction model;(5) Develop the three-dimensional fracture acidizing design software and its application.Through the research work, the following conclusions are derived:(1) The acid-rock reaction model and acid leakoff physical model of this article have good practicability;(2) We get acid-rock reaction dynamic parameters and dynamical equations through experiment, erect acid leakoff model which takes the erosion into account. They are more credible.(3) We get the three-dimensional fracture extend mathematical model, which takes acid flow ,acid-rock reaction and pressure change in asymmetrical longitudinal into consideration. The model approaches practical condition.(4) The article presents a fracture acidizing craft proved to be effective in field practice.With the aforesaid physical models and theory, we develop three-dimensional fracture acidizing design software by using Visual Basic 6.0 programming language. The software can supervise fracture acidizing design .