New technology of gas recovery by the combined drainage of pumping-velocity strings

被引：0
|
作者：
Su C. [1 ]
Wei L. [1 ]
Wu S. [2 ]
机构：
[1] Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, 610051, Sichuan
[2] University of Calgary, Calgary, T2N1N4, AB
来源：
Natural Gas Industry | 2019年 / 39卷 / 11期
关键词：
Complex drainage gas recovery; Gas lock; Hollow sucker rod; Ordos Basin; Pumping; Sand sticking; Special pump for drainage gas recovery; Sulige Gas Field; Velocity string;
D O I：
10.3787/j.issn.1000-0976.2019.11.010
中图分类号：
学科分类号：
摘要：
In order to improve the applicability of commonly used drainage gas recovery technologies while reducing the additional cost caused by the adjustment of drainage technologies, this paper improved the pumping process using the hollow sucker rod. And combined with the newly developed special air-proof hollow pump for drainage gas recovery, a gas recovery process by combined drainage of pumping-velocity string was formed. Then, field test was carried out at a water-production gas well in the Sulige Gas Field. And the following research results were obtained. First, in this new process, pumping, velocity string, gas lift, foam scrubbing and other drainage technologies can be combined freely, and drainage technologies can be flexibly adjusted according to the water production characteristics of the gas well. And thus the adaptability of the process is improved. Second, the traveling valve and the static valve adopted in this process all depend on the driving force of the pumping unit and the gravity of the hollow sucker rod to realize the forced opening and closing, so the mechanical pumping failure caused by the gas lock and sand sticking is avoided. Third, the selection principles of the gas well in this process include higher initial gas production rates (>1×104 m3/d), higher water production rates (3-30 m3/d) and short distances from the wellhead to the liquid surface (<2 500 m). Fourth, as for the gas wells with a gas production rate of 2×104 m3/d or 1×104 m3/d, it is necessary to adopt the hollow sucker rod 36 mm in outer diameter and 6 mm in wall thickness or 38 mm in outer diameter and 6 mm in wall thickness for the drainage gas recovery of velocity string. And for the gas wells with a gas production rate of 0.6×104 m3/d, it is necessary to adopt the hollow sucker rod 34 mm in outer diameter and 5.5 mm in wall thickness. In conclusion, the gas recovery process by combined drainage of pumping-velocity string can increase the stable gas production rate of water-production gas wells greatly and realize the continuous stable production of water-production gas wells, presenting good application effects. © 2019, Natural Gas Industry Journal Agency. All right reserved.
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页码：81 / 85
页数：4
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