Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 138-144.doi: 10.12108/yxyqc.20210314

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

New model of gas-liquid two-phase choke flow and its application

LI Nanxing1,2, ZHANG Peng1,3, ZHENG Rui2, MA Long1,2, YANG Chengliang1,2   

  1. 1. Gas-lift Technology Innovation Center, PetroChina Tuha Oilfield Company, Shanshan 838202, Xinjiang, China;
    2. Research Institute of Engineering and Technology, PetroChina Tuha Oilfield Company, Shanshan 838202, Xinjiang, China;
    3. College of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China
  • Received:2020-05-18 Revised:2020-07-30 Published:2021-06-03

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Abstract: In order to obtain larger profits，it is important to choose reasonable choke size and extend the flowing period. However，the existing choke flow model is difficult to meet the demands of North Azadegan Oilfield. By using the dimensional analysis principle of Rayleigh method，least square method and multiple linear regression method based on field data，a new choke flow model suitable for North Azadegan Oilfield was established by adding the three parameters of API gravity，crude oil viscosity and water cut to the critical choke flow formula. The results show that the average relative error of the mass flow rate predicted by the new model is 1.1%， the average absolute error is 6.5%，the correlation coefficient is 0.876，and the comprehensive evaluation coefficient is 0.933. The average relative error of the predicted production rate is 2.9%，the average absolute error is 8.4%，the correlation coefficient is 0.829，and the comprehensive evaluation coefficient is 0.900. Compared with other evaluation models，the new model has higher accuracy. Field application shows that the production rate in different stages calculated by the new model has excellent consistency with the on-site production data. Not only the change trend of the production rate is more consistent，but also the average relative error and absolute error of the corresponding data are within 10%. Compared with other models，the new model is more consistent with the production characteristics of the oilfield and can meet the demands of oil well production rate calculation and prediction. The establishment of the new model provides a theoretical basis for the reasonable selection of choke size， the completion of daily production rate and the extension of the flowing period in this oilfield. Furthermore，it has reference and guiding significance for other similar oilfields.

Key words: flowing well, two-phase choke flow, model evaluation, critical state, North Azadegan Oilfield

CLC Number: 

  • TE355.2+1
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