Influence of instantaneous shut-in on the pressure fluctuation in a buckling string
ZHANG Zhi1,WANG Jiawei1,QIAO Yu2,ZHANG Jiazhen2
1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
2.Drilling and Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co., Ltd., Guanghan 618300, China
Abstract:When the gas well buckles seriously, the tubing trajectory is complex, so the error of using the fluid transient model in the vertical well to solve the pressure fluctuation after shut in is too large, and the calculation results lose the reference value. Based on the perturbation method, a transient flow model suitable for the fluid in the buckling string is established in this paper. Taking into account the valve closing time, wellhead end opening and tubing buckling degree, the changes of pressure and flow rate of gas well after sudden shut in are analyzed and calculated. According to the calculation and analysis, when the tubing has spiral buckling, the local friction will be generated at the buckling part, and the pressure wave will be dissipated. Compared with the case without spiral buckling, the wellhead pressure is smaller. With the increase of valve closing time, the peak value of wellhead pressure decreases, and with the increase of valve closing time, the regularity of pressure change curve becomes less and less obvious; with the increase of valve closing time, the wellhead speed decreases more slowly, and the fluctuation amplitude and duration also decrease correspondingly. When the end opening of the valve is 0, the fluctuation of wellhead pressure lasts for a long time. The larger the pitch is, the smaller the tubing buckling is, the smaller the friction of the fluid in the tubing is, and the higher the wellhead pressure is. The calculation results of the model are closer to the real data, which has a positive guiding significance for the field operation.
张智1,王嘉伟1,乔雨2,张家振2. 瞬时关井对屈曲管柱内压力波动的影响研究[J]. 振动与冲击, 2023, 42(6): 61-68.
ZHANG Zhi1,WANG Jiawei1,QIAO Yu2,ZHANG Jiazhen2. Influence of instantaneous shut-in on the pressure fluctuation in a buckling string. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(6): 61-68.
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