Petroleum Technology Digest: Automated casing swab pump increases marginal gas well production ///

A new pump developed by Brandywine Energy and Development Co. (BEDCO) has performed satisfactorily and increased gas production from the 3,000-ft-deep Medina formation tight-gas sandstone in New York. The tool lifts 0.5 to several barrels of brine per day and has, in six wells, increased gas production 1.5 – 3.0 times that produced with previous, standard, mechanically operated casing swabs and periodic swabbing with a workover rig. One well, Lenape's Well-52, has used the tool since late 1996, and has realized more than $50,000 of increased gas revenue since installation. Among stripper gas wells, data reveal that brine accumulation is the primary reason for declining natural gas production and oftentimes subsequent well abandonment. Just a few tenths to a few barrels per day can and does kill gas production. Conventional fluid removal techniques using beam pumps, periodic swabbing of fluids with workover rigs, siphon strings and tubing plungers or rabbits have both physical limitations and significant capital, operating and maintenance cost considerations. Regular, rhythmic removal of fluids as they accumulate in the well increases gas production. Averting a brine column and a brine-wet zone in the production horizon fosters the ease of movement of gas into the well.

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