Inderscience Publishers

Study on the wellbore flow and phase transition during formation H 2 S invasion

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Considering the special physical properties of hydrogen sulphide (H
2
S) and its phase transition in the wellbore, a mathematical model for wellbore flow and heat transfer during formation H
2
S invasion was established. Heat transfer and pressure were calculated along with H
2
S physical properties parameters, and a solution method of the model was proposed. The results indicate that liquid H
2
S transforms into gas state during its rising process in the annulus when choke pressure is low; the flow above phase transition point is two-phase flow while the flow below phase transition point is single-phase flow in the annulus. The paper exhibits the results and the reasons of the bottom-hole pressure and the depth of phase transition varying with different H
2
S influx rate, injection rate, choke pressure, and land surface temperature. The study is of certain significance for improving the safety during the exploration of acidic oil and gas reservoirs.

Keywords: H 2 S invasion, well control, wellbore flow, heat transfer, phase transition, bottom-hole pressure, BHP

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