Publications

Two-Rate Flow Test method has been used in Langkat Field Pertamina Unit EP-I, to estimate the average reservoir pressure, formation permeability and skin-factor. The required pressure data were obtained by observation of the transient bottomhole pressure behakor after the stabilized producing rate of the well was changed to another lower rate.Other parameters required for the analysis of Two-Rate Flow Test were similar to those used for the conventional pressure build-up analysis.The advantage of applying this new method was that the extended shut in periods experienced with conventional build-ups because of long, low rate after production periods were eliminated by flow tests.In 1983, Langkat Field carried out 17 Two-Rate Flow Test measurements, which could avoid a total production loss of about 201 m3.The analysis of flowing bottom hole pressure data gave the same value of P* (P extrapolation) as pressure build-up test, except in oil producing wells with high water cut (water cut > 50 %).It was also found that the application of Two-Rate Flow Test could indicate the effect of a fault.