Methods and apparatus for underbalance condition assurance in depleted volatile oil reservoirs

Abstract

A method is disclosed that includes deploying a jet pump assembly from a surface location into a production tubing of a depleted volatile oil reservoir, the jet pump assembly including retractable tubing, a jet pump and a retractable packer operatively connected with the retractable tubing. The jet pump assembly is positioned within the production tubing, the retractable packer is engaged to bridge a space between the jet pump assembly and a surface of the production tubing, and the jet pump is activated to pump toward the surface location a mixture comprising a power fluid and reservoir fluid. The method further includes disengaging the retractable packer and determining whether there is an underbalance condition. Also disclosed are a related jet pump assembly and bi-directional valve arrangement. The valve arrangement includes upper and lower valves, and retains power fluid in retractable tubing during retraction of a jet pump assembly from production tubing.