Non-uniform Acid-etched Process in X Block Carbonate Reservoir
The development of X Block carbonate rock oil field depends mainly on the method of acid pressure,but the acid-etched solution of single acid is not ideal for the degree of stratum recon-struction,and can not form an effective yield increase.In view of the problem of insufficient acid-etched conductivity under the conditions of high temperature and high closing pressure in X Block ar-ea,this paper studies the effect of single acid solution and non-uniform acidification on the acid-etched conductivity by using indoor acid-etched experiment,and the morphological characteristics of the acid-etched crack are characterized.The results show that the surface of the crack is uniform in the acid etching,and the cross-linked acid and non-uniform acidification can form dissolved pores,but the non-uniform acidification is more complicated and diverse;the complex acid-etched hole formed by non-uniform acidification is under high closing pressure.It can effectively support the cracks,form a better seepage channel,and has a larger conductivity.The field has been successful-ly implemented in SHB-X Well.The non-uniform acidification can significantly increase oil produc-tion,and the daily output has remained stable without significant reduction,which proves the feasi-bility of non-uniform acidification in large-scale application in X Block Oilfield.
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