Measurement of Hydrocarbon Dew Point for Natural Gas of Titas Gas Field in Bangladesh

Abstract

Hydrocarbon dew point (HCDP) measurement is universally used in the natural gas industry as an important quality parameter and it is noteworthy for the transportation of natural gas safely through the pipelines. Necessary measures should be taken to avoid hydrocarbon condensation as it can create ice or plug in the pipe line if the hydrocarbon dew point of pipelined natural gas is too high. This problem is rising in single phase transportation. Thus, for the best use of natural gas maintaining all safety measures prediction of hydrocarbon dew point is a must. In this study a scientific investigation has been conducted by the authors to scientifically investigate the hydrocarbon dew point of several gas wells (Location-A, C, E, G) of Titas Gas fields in Bangladesh. As per latest Petrobangla re-estimation, total recoverable gas reserve of Titas gas field is 7,582 billion cubic feet (BCF). Commercial gas production from this field was commenced in April 1968 and till May 31, 2018 total 4545.491 billion cubic feet gas or 59.95% of reserves has been recovered. Applying various experiments has been conducted for this measurement with a view to finding the effect of the volume of the sample gas, the chamber’s temperature and the sample conditioning. It is observed that, no volume effect or sample conditioning effect was found. Despite chamber’s temperature is observed that ranges from 73 to 90 °C which has an effect of approximately 0.9 °C on the measured dew points. This research depicts the another challenging issue is adsorption phenomena which is observed of heavy hydrocarbons inside the rig, which is common in HCDP measurements, this effect is more predominant in gases consisting of heavier compounds, as in the case of the real gas.