A thorough analysis of the reservoir current state and constant monitoring of operational parameters, which characterize the reserves production intensity, are required to ensure gas and gas-condensate production target and optimal planning for further development with the most efficient resources usage. However, current wells operation diagnosing is sometimes difficult due to the recording sensors installing problems at the bottomhole or tool failures under high temperature and pressure conditions. The developed technology for evaluation of the gas-condensate wells operational parameters based on field data is described in the paper. The technology includes an approximation of the dependence of the condensate-gas and water-gas factor on bottmhole pressure based on a wellhead flowmeter measurements and three-component gas-liquid flow model in a wellbore. Volumetric gas flow is estimated by gas flow model through the choke, water flow and gas condensate flow is estimated by obtained approximations. Differential equations system, which uses the basic conservation laws, empirical functions for various flow modes and wellbore geometry, is iteratively solved to determine bottomhole pressure and temperature. The resulting operational parameters estimates can be used to monitor wells operation, control, record and forecast its production. The calculation module prototype was developed on the base of described methodology and was tested on more than 25 wells. The calculation results showed higher convergence with the data from metering installations than previously used approaches, especially for significant water cut wells.
References
1. Brill J.P., Mukherjee H., Multiphase flow in wells, SPE Monograph, Henry L. Dogherty Series, V.17, 1999, 164 p.
2. Maron V.I., Gidravlika dvukhfaznykh potokov v truboprovodakh (Hydraulics of two-phase flows in pipelines), St. Petersburg: Lan Publ., 2012, 256 p.
3. Kalitkin N.N., Chislennye metody (Numerical methods), Moscow: Nauka Publ., 1978, 512 p.
