Study on the wellbore flow and phase transition during formation H2S invasion. (1st January 2013)

• Record Type: Journal Article
• Authors: Dou, Liangbin; Li, Gensheng; Shen, Zhonghou; Huang, Zhongwei; Song, Xianzhi
• Is Part Of: International journal of oil, gas and coal technology. Volume 6:Number 6(2013)
• Page Start: 658
• Page End: 674
• Publication Date: 2013-01-01
• Subjects: H2S invasion -- well control -- wellbore flow -- heat transfer -- phase transition -- bottom-hole pressure -- BHP; Petroleum as fuel -- Periodicals; Gas as fuel -- Periodicals; Coal -- Periodicals; Biomass energy -- Periodicals; Hydrogen as fuel -- Periodicals; 662.6
• Languages: English
• ISSNs: 1753-3309

Abstract

Considering the special physical properties of hydrogen sulphide (H2 S) and its phase transition in the wellbore, a mathematical model for wellbore flow and heat transfer during formation H2 S invasion was established. Heat transfer and pressure were calculated along with H2 S physical properties parameters, and a solution method of the model was proposed. The results indicate that liquid H2 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 H2 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.