E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/53
E21B 31/03 (2006.01)
Patent
CA 1200199
A B S T R A C T A method and apparatus for removing debris involves an elongate string operable to pump the debris from a well into the string. A pumping portion of the string includes a hollow piston with a hollow, splined piston rod fixed to the upper portion of the string, above the pumping portion, and keyed to the pumping portion to transmit rotary motion from the upper portion to the debris retaining portion below the pumping portion. A hollow piston head includes a valve, advantageously a ball valve, to prevent downward fluid flow. By reciprocating the upper portion, well debris is pumped into the debris retaining portion and solid debris is trapped therein by a one-way check valve. The liquid debris, such as heavy water, continues upwardly through the string passing through the interior of the piston and into the upper portion. The upper portion selectively receives either a ported sub, in which case the liquid is recirculated back into the well or an unported sub that prevents the return of the debris to the well. An additional check valve may be located in the upper portion to retain the liquid in the upper portion and to relieve the stress on the ball valve. The check valves, removably secured within removable subs, preferably are flap valves, including a torsion spring biased flap element with the torsion spring located out of the direct path of fluid movement to decrease valve fouling.
446958
Caldwell Donald B.
Dunsmuir George H.
LandOfFree
Method and apparatus for removal of downhole well debris does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for removal of downhole well debris, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for removal of downhole well debris will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1281856