Enhancing Profitability Through Technological Innovation: Inverse Gas Lift System as Game-Changer for Well Services

Abstract

This study evaluates the viability of the rigless inverse gas lift system as a technical and economical alternative to conventional gas lift systems. The rigless inverse gas lift system aims to enable gas injection at any depth within the wellbore without the need for a rig, facilitating sustained and enhanced production.

The proposed design of rigless inverse gas lift system incorporates a series of rigless interventions to kick-start wells post-shutdown without external interventions. Starting with well preparation of the installation of a gas-tight straddle system for valve isolation, deployment of a retrievable bridge plug at the tubing end to check for leaks, and placement of a shallow retrievable bridge plug to set up the intermediate spool beneath the tree. Followed by, retrofit system installation as the system includes running in hole with a lower injection valve, adjusting and securing coiled tubing via a concentric hanger, and finalizing installation with a lock nut on the tree to maintain the concentric hanger's position.

In-depth field testing and subsequent application of the proposed technology using 2-3/8″ coiled tubing for targeted single-point gas injection has validated significant enhancements in operational efficiencies across several metrics. Detailed analysis from one of the pivotal case studies, featuring a well with reservoir pressures higher than 2000 psig illustrates the robust capabilities of this system. This particular application achieved a liquid production rate of 5,000 Stb/d, despite a 100% water cut, while maintaining an optimal wellhead pressure of 70 psig. Critically, the gas injection rate was calibrated to 0.51 MMScf/d, optimizing the lift gas volume to maintain pressure stability and effective fluid lifting without necessitating an increase in operational inputs or external mechanical intervention. This setup supports the well's return to operational status post an extended shutdown and also underlines the system's ability to facilitate autonomous well management.

These field application results underscore the system's efficacy in enhancing well productivity and stability through precise control of gas lift variables. This technology innovative approach effectively minimizes operational costs, paving the way for more sustainable production methodologies in the oil and gas industry.

The inverse gas lift system introduces an innovative approach to gas lift, utilizing rigless technology to minimize operational disruptions and reduce costs associated with conventional gas lift methods. This system not only enhances well productivity but also extends the operational life of wells by allowing for more flexible, efficient gas injection strategies.