Wells – Processes – Cleaning or unloading well
Patent
1994-12-16
1996-04-09
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
134198, 137808, 175323, 175 67, 2395891, E21B 724, E21B 718, E21B 2100, E21B 3700
Patent
active
055052622
ABSTRACT:
A fluid accelerating and pulsation generating apparatus for minimizing loss in fluid energy through frictional pressure drop for fluid passing through the apparatus is characterized by a body having a generally cylindrical chamber formed by a cylindrical inner wall and opposed transverse end walls. One of the end walls has one or more fluid inlet ports arranged therein and defined by passages which intersect the end wall at an angle with respect to a plane normal to the central longitudinal axis of the chamber and generally tangentially with respect to the cylindrical inner wall. Plural discharge passages intersect the opposite end wall at a curved wall portion formed between the cylindrical inner wall and the opposite end wall. The discharge passages may also be arranged to have their axes extending tangentially with respect to the inner cylindrical wall and at a predetermined angle with respect to a plane normal to the central longitudinal axis of the chamber. Pulsation generating ball members may be disposed in the chamber and engageable with the curved wall portion to momentarily cover the discharge passages as the ball members are propelled by spiral fluid flow through the chamber. The apparatus minimizes fluid pressure losses for fluid flowing therethrough and is operable to generate pulsed flow. The apparatus may be used as a fluid mixing and application device, for jet blast cleaning, material removal, and in wellbore operations for wellbore cleanout, fluid flow inducement and improved well drilling.
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