Mechanism and law of heavy oil sand production in multi-component thermal fluid development
This paper takes the huff and puff development of multi-component thermal fluid as the main research object,based on the reservoir characteristics of multi-component thermal flu-id in the development of heavy oil,through searching relevant literature and carrying out for-mation simulation experiments of multi-component thermal fluid core displacement,cavitation water jet rock breaking and other experiments,it is found that the dissolution of high-tempera-ture components of multi-component thermal fluid,cavitation,viscosity reduction,and compo-sition changes of multi-component thermal fluid will lead to reservoir sand production.Further-more,through the sand production simulation experiment of multi-component thermal fluid huff and puff,it is found that the soaking time is the main factor affecting sand production.In view of the multi-round characteristics of huff and puff development,multi-round sand produc-tion simulation experiments are also carried out in this paper.In view of the multi-round characteristics of huff and puff development,multiple rounds of sand production simulation experiments were carried out.As the huff and puff rounds change,the influence of various factors on sand production becomes more and more obvious,that is,temperature has the stron-gest influence,and injection speed is the second.In short,the pressure is the weakest.This study is helpful to guide fine sand control,set up a reasonable production and mining system,and play a very important role in prolonging the life of oil and gas wells and improving economic benefits.
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