Research On Well And Layer Selection Method Of Carbonate Repeat Acid Fracturing

As the innovation of acid technical system and the constant improvement of acid fracturing technique,Acid fracturing modification technology has become the main technology method of stimulation forcarbonate reservoir. Acid fracturing modification technology has brought huge economic benefits for thecarbonate oilfield, but relative to the sand fracturing, the validity of the acid fracturing is usually shorter,and quadratic transformation is usually used to restore the single well capacity. Problems such as morewells and layers, more old failure wells, worse reservoir variation and worse transformation effects haveappeared due to long time of production and continuous construction. It the key for performing repeat acidfracturing modification technique to optimize some wells that still have potential yield. It’s extremelyimportant to exploit the potential capacity of old failure wells, realizing high utilization and efficient ofthose wells for the problems of carbonate repeat acid reconstruction. Therefore, it’s has very importantsignificance for the production of actual oil field to research on the well and layer selection method ofcarbonate repeat acid fracturing.This article has learnt from foreign experience and combined with actual carbonate oil field overseasclosely before study on the reservoir structure, lithology, fluid, temperature and pressure characteristics ofKazakhstan Zanarol oil field, And the acid corrosion mechanism of repeated carbonate reservoir acidfracturing modification and the past situation of acid production stimulation of Zanarol have also beanalyzed. On basis of this, well and layer selection model of repeat acid fracture has been established usingthe neural network, production statistics and multiple regression method, and solving and realizingprocedure have also been offered. Applying this theoretical achievements in south Дand north Д ofZanarol.Optimizing of acid carbonation fracturing of twenty wells in south Дand north Д with threedifferent methods and the optimizing results has provided a theoretical basis for the oil field construction.