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- Title
高含硫气井钻完井技术新进展与发展展望.
- Authors
张 智; 付建红; 白 杨; 尹 虎; 赵苑瑾; 黄 媚
- Abstract
There are abundant high-sulfur natural gas resources in China, but they are generally characterized by high temperature, high pressure, and high corrosive gas content, and their production tends to suffer gas invasion, well kick, pipe corrosion and other safety hazards, so the safe and efficient drilling and completion is of great significance to ensure the stable production and production increase of high-sulfur natural gas in China. In this paper, the fluid phase characteristics and wellbore pressure in the drilling process of high-sulfur natural gas well are analyzed. Then, from the perspective of wellbore pressure control, the domestic and foreign new breakthroughs and progresses in the key technologies for drilling, drilling fluid and wellbore integrity of high-sulfur gas wells in recent years are summarized and analyzed. Finally, the development trend of the drilling and completion technologies for 10 000 m deep wells are forecasted. And the following research results are obtained. First, gas solubility has a greater influence on wellbore flow pressure, so in the drilling process of high-sulfur gas well, it is necessary to consider the influence of acid gas solution on the multiphase flow in the wellbore. Second, the precisely managed pressure drilling technology and the managed pressure cementing technology can accurately control the wellbore pressure within the safe density window, so as to prevent acidic gases from entering the wellbore during the drilling, and ensure stable pressure and no leakage during the cementing. Third, the drilling fluid technology suitable for H2S strata is researched and developed, which can not only ensure wellbore stability and reservoir protection, but also improve the rate of penetration. Fourth, the quantitative assessment method of integrity risk and the low-cost anti-corrosion technology are studied with the optimized design of downhole string structure as the beginning point, which can realize the whole-life-cycle wellbore integrity and reduce the safety hazards in the drilling, completion and production of high-sulfur gas wells. In conclusion, the systematic analysis on the new progresses of high-sulfur gas well drilling and completion technologies is of great realistic significance to the safe and efficient development of high-sulfur natural gas reservoirs, and provides the research ideas and directions for the development of the technologies for the safe and efficient drilling and completion of deep and ultra deep wells in high-sulfur gas reservoirs.
- Subjects
CHINA; GAS well drilling; GAS reservoirs; DRILLING fluids; GAS wells; DRILLING muds; GAS condensate reservoirs; NATURAL gas
- Publication
Natural Gas Industry, 2023, Vol 43, Issue 9, p25
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2023.09.003