Ejectors extend producing life of aging coalbed methane wells

Installation of ejectors has extended the life of 17 mature coalbed methane wells operated by BP America Production Co. in northwestern New Mexico and southwestern Colorado.David Simpson, senior staff mechanical engineer for BP in Farmington, NM, says "The main thing we're doing is applying a little extra horsepower to pull on the tubing in the wellbore, while we produce most of the gas in the tubing-casing annulus."He explains that these wells are late in their lives and because of the low reservoir pressure, as low as 45-60 psi, rod pumps require more net positive suction head (NPSH) than is available, and in some cases, 100 ft of water above a pump is more backpressure than the res...

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