Two-phase Flow Model Study In Aerated Under-balanced Drilling

In the present time ,the under-balanced drilling technology is used widely in foreign oil field , and also increased quickly in our country. But the research on two-phase flow discipline during under-balanced drilling is not sufficient for the oil field practice. So in this paper, it focuses on the base of gas-liquid two-phase flow in under-balanced drilling and modeling study. Comparing Guo model with Hasan-Kabir model,the study discusses the models using in under-balanced drilling. It proofs that the two-phase flow model Hasan-Kabir model is better by the comparative analysis. In order to raise the accuracy,by the prerequisite of considering gas compressibility factor and acceleration,my study amends H-K model and we get a new model called advanced H-K model. By the use of actual measurement data, we do example calculation and compareing with H-K model the results demonstrate that the model has less corrigendum and better practicability. This model provides foundation for under-balanced drilling design and calculation.On the basis of advanced H-K model we compile software and using the actual measurement data we do example calculation and the results demonstrate that the software has good practicability and the advanced H-K model has viability by comparing with the international advanced software HUBS.This study combines theoretical model and software simulation and oil field actual measurement data, it proofs that the software has good practicability and the advanced H-K model has accuracy. Then it demonstrates that my study has significance on the area of under-balanced drilling research.