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Abstract Field Delta located 95 Km North West of the city of Mumbai is producing through 13 wellhead platforms through approximately 60 oil wells mostly operating on gas lift. The recent flowing gradient surveys recorded in the wells have indicated drop in liquid level thus resulting in de-optimized gas lift system. Many wells in the field have also ceased to flow due to liquid loading and gradual drop in liquid level below the last operating gas lift valves. Recompleting the wells with smaller tubing sizes and Gas Lift Valves upto the bottom of the well using workover rig in offshore is cost intensive and time taking and may not be economically viable for all the wells. Therefore various revival strategies which do not require workover and can be used for extending the operating life of mature wells have been discussed in the paper through various case studies. These technologies provide a sustainable & reliable means to retrofit gas lift to reach the deepest point. Methodology adopted to carry out the designing by matching the existing valve depths and possibility to go deeper considering the system limitation has been discussed in the paper with few examples. Simulation indicated that in 6 wells scope exists for enhancing production by replacing dummies at deeper depths with CVs with the available gas injection Pressure. 19 wells have been identified in which scope exists for deeper injection below current injection depth (last Gas Lift Mandrel) through rig-less applications like single point gas lift and rigless coiled tubing gas lift system below the packer. A comparative analysis of different technologies to revive production from liquid loaded wells have been brought out in the paper through various case studies.
Devsali et al. (Thu,) studied this question.
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