Study on the Influence Law of Gas Testing System on the Proppant Flowback

Abstract

There are more and more oil and gas wells that adopt fracturing and stimulation measures, and fracturing construction technology are also emerging, but different fracturing technology are facing the same problem of sand production after fracturing. The main sources of sand flowback after fracturing include crushed reservoir cuttings and proppant flowback. In order to study the influence of the gas testing system on the proppant flowback, a mathematical model of the proppant flowback is established based on the capillary force and shear stress in this paper. This model is mainly used to describe the relationship between the critical flow velocity and the critical production. The results show that the larger the production pressure difference is, the smaller the critical gas flow velocity can be, the more likely the proppant flowback occurs; the greater the closure pressure is, the more likely the proppant flowback occurs, and the greater the effect of fracture width on critical production; As the fracture width increases, the critical flow rate increases. The research results in this paper provide a reasonable gas testing calculation method for some areas where sand production is serious after fracturing, and provide an important reference for the study of the influence of proppant flowback.KeywordsSand production after fracturingProppant flowbackProduction pressure differenceClosure pressureFracture width