How they can make you money.
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Oil wells where line pressure is higher than well pressure.

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Oil wells where lower back pressure (hydrostatic) on formation will increase fluids and gas volumes.

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Gas wells where rod pumping is necessary to remove water.

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For use in oil wells where gas locking of bottom hole pumps is a problem.

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Oil wells where there is a prohibition from venting gas to the atmosphere.

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For marginal wells where increased production will eliminate the need to plug.