CPC E21B 43/12 (2013.01) [E21B 33/068 (2013.01); E21B 34/02 (2013.01); E21B 47/00 (2013.01)] | 8 Claims |
1. A method for pumping chemicals down a wellbore, the method comprising:
passing a well material comprising at least one of a fluid or gas from the wellbore at a well material pressure to a wellhead assembly in communication with the wellbore, wherein the well material is material extracted from a subterranean hole through the wellbore;
maintaining a wellhead pressure portion of the wellhead assembly at a wellhead pressure equal to the well material pressure by passing at least a portion of the well material to the wellhead pressure portion of a pumping chamber through a wellhead pressure inlet valve positioned between the wellhead assembly and the wellhead pressure portion, wherein the wellhead pressure inlet valve is operable between a closed position and an open position, so as to control the portion of the well material passed from the wellhead assembly to the wellhead pressure portion, thereby applying a force on a movable plate positioned within the pumping chamber, wherein the pumping chamber defines the wellhead pressure portion and a chemical portion separated by the movable plate;
applying a pressure on chemicals positioned in the chemical portion of the pumping chamber with the movable plate; and
moving the chemicals from the chemical portion of the pumping chamber to the wellbore.
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