Screenless Completions as a Viable Through-Tubing Sand Control Completion

摘要

Screenless sand control completions provide a cost-effective means of completing wells in the Gulf of Mexico by eliminating the need to have a rig on location. To date, six screenless completions have been performed for a major operator in the Gulf of Mexico. Each of the six treatments provided significant cost savings, as well as excellent return on investment for the operator. Screenless completions are an integrated solution that involve many field-proven technologies such as reservoir characterization, perforating, coiled-tubing intervention, matrix acidizing, resin consolidation, optimized fracturing with proppant flowback control, and fines migration prevention. The proper candidate selection, treatment design, treatment execution, production management and co-ordination of all services are essential to the success of the screenless completion. In this paper, the common sequence of events for a screenless completion is presented as well as the key technologies involved, from perforating to production. Each of the six case histories are examined in detail and will show that screenless completions provide effective through-tubing sand control in a variety of well conditions. Screenless completions have been proven effective in reservoirs from 10 to 60 ft in thickness, at depths from 4,000 to 10,500-ft true vertical depth, in casings from 3-1/2 to 9-5/8-in. and in oil and gas reservoirs at rates of up to 600 BOPD, 1750 BFPD or 3.5 MMSCFD and in wells deviated as high as 42o. The technique can also be applied in different wellbore configurations to target pay behind casing, and also zones that are located behind both tubing and casing.