New progresses and development prospects of drilling and completion technologies of high-sulfur gas wells

被引：0
|
作者：
Zhang Z. [1 ]
Fu J. [1 ]
Bai Y. [1 ]
Yin H. [1 ]
Zhao Y. [1 ]
Huang M. [2 ]
机构：
[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan, Chengdu
[2] PetroChina Southwest Oil & Gasfield Company, Sichuan, Chengdu
来源：
Natural Gas Industry | 2023年 / 43卷 / 09期
关键词：
Drilling fluid; Drilling technology; High sulfur; Ultra-deep well; Wellbore integrity; Wellbore pressure;
D O I：
10.3787/j.issn.1000-0976.2023.09.003
中图分类号：
学科分类号：
摘要：
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. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
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页码：25 / 33
页数：8
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