Minimum Miscibility Pressure estimation in the lower sands of Colombia en Paz oilfield

Abstract

In Colombia en paz Oil Field, the opportunity to increase productivity through the implementation of secondary recovery methods is visualized. The project aims at basal sands because the quality of its fluid is better compared to the upper sands (30 ° API vs 20 ° API, respectively). The main objective is to evaluate the effect of gas reinjection on oil production.

Today, the field has a gas lift network (Gas Lift) with an available pressure of 1,200 psi. Which would be used for the implementation of the process both cyclic and continuous and with flow rates between 100 - 1,000 kscfpd (kilo standard cubic feet per day). Oil production is expected to increase due to pressurization in the well drainage area and increased mobility by partial solubility of the gas in the crude.

At the Center of Innovation and Technology - Instituto Colombiano del Petróleo, the recovery of crude oil was measured by the injection of production gas. The technical standard GTN-I-009 was used to conduct runs with production gas. The tests were performed at 138 ° F reservoir temperature, 440 scf / STB Gas Oil Ratio and crude with Basic Sediments and Water (BS&W) less than 1% as required by the experimental protocols.

At the laboratory, the total recovered crude with production gas was 18 % at the maximum operating pressure of 1,600 psi for the Gas Lift system. The Minimum Miscibility Pressure was estimated at 8,407 psi by linear extrapolation using experimental data taken from Slim Tube Equipment.

Keywords: Gas injection, Slim Tube, Minimum Miscibility Pressure.