Tools To Manage Gas/Condensate Reservoirs: Novel Fluid-Property Correlations Based on Commonly Available Field Data

摘要

Certain fluid properties are required for studies related to management of gas condensate reservoirs or prediction of condensate reserves. Often these studies must begin before laboratory data become available or possibly when laboratory data will not become available. Correlations to estimate values of these properties have been developed based solely on commonly available field data. These properties are (1) the dewpoint pressure of the reservoir fluid, (2) changes in the specific gravity of the reservoir gas as reservoir pressure declines, and (3) changes in the surface yield of condensate as reservoir pressure declines. No correlations for any of these properties based on field data have been published. The field data required are initial producing gas- condensate ratio from the first stage separator, initial stock- tank liquid gravity in ~O API, specific gravity of the initial reservoir gas, reservoir temperature, and selected values of reservoir pressure. The dewpoint pressure correlation is based on data of 615 samples of gas condensates with worldwide origins. The other two correlations are based on 851 lines of constant volume depletion data from 190 gas condensate samples, also with worldwide origins.