Patent ID: 6343653
Filing Date: 2002-02-05
Classification: E21B

Abstract:
An apparatus for injecting a chemical into an oil well producing fluids including oil and gas from a subsurface formation, said well having a casing extending to or near the subsurface formation, a wellhead mounted on said casing, a production pipe extending through the wellhead and through at least a portion of the casing defining therewith an annulus, and a subsurface pump positioned at or near the lower end of the production pipe, said apparatus comprising:(a) a by-pass line interconnecting the production pipe and annulus, (b) a venturi nozzle mounted in the by-pass line and having an inlet and a throat, said throat having a smaller diameter than said inlet, (c) a storage container containing an oil well treatment chemical, and (d) a pipe interconnecting the storage container and the throat of the venturi nozzle whereby a portion of the fluid produced by the subsurface pump flows through the production pipe, the by-pass line, and into the well annulus thereby drawing the oil treatment chemical from the storage container into the by-pass line by action of the venturi nozzle.