Subsea wellhead arrangement for hydraulically pumping a well
View Patent ↗A subsea well pumping system for installing and retrieving a hydraulically actuated down hole pump employed within the tubing suspended within casing extending from above a seabed, the system having a wellhead assembly affixed to the upper end of the casing for supporting the tubing and including provision for hydraulically communicating with the interior of the casing and the tubing, a remotely controllable main valve affixed to the tubing at its upper end, a tubular pump lubricator affixed at its lower end to the main valve, a removable pump latch sealably closing the pump lubricator at its upper end and having a pump catcher extending downwardly therefrom for removably latching onto the pump and a system for guiding the pump suspended form the pump catcher into the pump lubricator whereby the pump can be moved downwardly in the tubing into a pumping position by fluid injected into the tubing and can be moved upwardly in the tubing into a retrievable position for grasping by the pump catcher by fluid injected into the casing.
1. A subsea well pumping system for installing and retrieving a hydraulically actuated down hole pump employed within tubing suspended within casing extending from above a seabed, the system including:
a wellhead assembly affixed to the upper end of the casing for supporting the tubing and including provision for hydraulically communicating with the interior of the casing and the tubing;
a remotely controllable main valve affixed to the tubing at its upper end;
a tubular pump lubricator affixed at its lower end to said main valve;
a removable pump latch sealably closing said pump lubricator at its upper end and having a pump catcher extending downwardly therefrom for removably latching onto the hydraulically actuated down hole pump; and
a system for guiding the hydraulically actuated down hole pump suspended from said pump catcher into said pump lubricator whereby the down hole pump can be moved downwardly in the tubing into a pumping position by fluid injected into the tubing and can be moved upwardly in the tubing into a retrievable position for grasping by said pump catcher by fluid injected into said casing.
2. A subsea well pumping system according to the claim 1 including:
a remotely controllable manifold valve system interrelating the flow into and out of the tubing, casing and said pump lubricator.
3. A subsea well pumping system according to the claim 1 including:
a standing valve supported within a lower portion of said tubing for sealably receiving the down hole pump when in said pumping position.
4. A subsea well pumping system according to claim 1 including:
a wire line guide assembly including at least one wire line secured at its lower end in fixed relation to said wellhead; and
a wire line installation and retrieval assembly forming said system for guiding the hydraulically activated down hole pump into said pump lubricator.
5. For use in a well pumping system employing an unsupported hydraulically actuated down hole pump and tubing suspended in casing by a wellhead, a pump insertion and removal system comprising:
a tubular pump lubricator having open upper and lower ends, having sidewall fluid inlets adjacent said upper and lower ends and configured to fully receive the unsupported hydraulically actuated down hole pump therein; and
a main valve secured to and for sealably closing said lower end of said pump lubricator when in a closed condition and for permitting said unsupported down hole pump to pass therethrough when open permitting said pump lubricator to be flushed.