TAILIEUCHUNG - An algorithm for simultaneous determination of pressure and temperature distribution in oil producing tube flow and the counter flow in gas lift annulus

The algorithm is based on a double loop iterative procedure and shooting method. The two-phase fiow calculation for pressure Used in the algorithm is baSed on improved methods of Beggs and Brills, Orkiuewski or Hagedorn and Brown. The numerical implementation for an example is presented to assure the applicability of proposed algorithm. | Vietnam Jourrial of Mechanics, NCST of Vietnam VoL :U, 1999, No 2, (99 - 115) AN ALGORITHM FOR SIMULTANEOUS DETERMINATION OF PRESSURE AND TEMPERATURE DISTRIBUTION IN OIL-PRODUCING TUBE FLOW AND THE COUNTER FLOW IN GAS-LIFT ANNULUS BY HA NGOC HIEN* ,NGUYEN VAN DIEP* I DUONG NGOC HAI*, NGUYEN VAN CANH* * * Institute of Mechanics, NCST of Vietnam **Institute a/Offshore Oil-Gas Research Design, JV Vietsovpetro . . ABSTRACT. An algorithm for simultaneous determination of pressure and temperature distribution in oil-producing tube flow and the counter flow in gas-lift annulus has been proposed. The algorithm is based on a double loop iterative procedure and shooting method. The two-phase fiow calculation for pressure Used in the algorithm is baSed on improved methods of Beggs and Brills, or Hagedorn Brown. The numerical implementation for an example is presented to assure the applicability of proposed algorithm. 1. Introduction The problem of accurately predicting pressure drops in oil-producing well has been developed in the last 50 years. In general, heat transfer calculations were not been considered, and the temperature distribution was usually assumed to be linear between the surface temperature and bottom hole temperature. In many cases this assumption will not introduce significant errors. Nevertheless, the heat transfer calculations can be very important when the liquid rate of a well is changed, in gas-lift:-injection wells, flow of nigh paraffin oil, etc. Various algorithms for coupling pressure and heat losses calculation in oilproducing well were presented in [1, 2]. These algorithms have been performed without considering the case of counter flow of gas in gas-lift annulus. This paper presents an algorithm for simultaneous calculation of pressure and heat losses in oil-producing tube. as well as in gas-lift annulus. Assuming the liquid production rate and gas injection rate are known, the pressure and temperature 99 distributions in th~

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