Patent ID: 7556100

Claim:
A method of delivering at least one treatment chemical in a liquid form into an underground hydrocarbon well equipped with a reciprocating plunger, the method comprising: when the plunger is at an upstroke, retaining the plunger above the well; shutting in the well; continuing to hold the plunger above the well; with the use of at least one chemical pump, dispensing at least one treatment chemical in a liquid form into the well; and releasing the plunger promptly after the at least one liquid treatment chemical is dispensed into the well, allowing the plunger to drop in the well after the at least one treatment chemical and assist in dispersing the at least one liquid treatment chemical throughout at least part of the well, distributing the at least one liquid treatment chemical along at least part of the inner surface of the well, pushing at least some of the at least one liquid treatment chemical to the bottom of the well or a combination thereof.