Wells – Above ground apparatus – With assembly or disassembly means
Reexamination Certificate
1999-07-13
2001-05-01
Bagnell, David (Department: 3672)
Wells
Above ground apparatus
With assembly or disassembly means
C166S075140, C166S085500, C166S086100, C166S368000
Reexamination Certificate
active
06223819
ABSTRACT:
TECHNICAL FIELD
This invention relates to wellheads and more specifically wellheads for use with a well pumping system including a pump rod string between a surface mounted prime mover and a downhole pump.
BACKGROUND OF THE INVENTION
Wells, particularly oil wells, which penetrate subterranean formations in which the natural formation pressure is depleted to the level that the oil will not flow to the surface require that the oil be lifted to the surface by various means including pumping the oil from the producing formation to surface facilities.
One of the several available pumping units for raising and lowering a pump rod to drive a downhole pump includes a hydraulic fluid operated cylinder attached to the pump rod to raise and lower the rod to operate the pump. One particular hydraulic system utilizing a cylinder for driving the pump rod is the Tieben Pumping Unit manufactured and sold by Tieben Inc. West McArtor Road, Dodge City, Kans. 67801. The Tieben Pumping Unit is disclosed and claimed in U.S. Pat. No. 4,762,473 issued Aug. 9, 1988. The Tieben Pumping Unit may be mounted directly on the tubing pumping tee with the hydraulic cylinder shaft connected directly to the rod string which drives the downhole pump. The Tieben Pumping Unit may be mounter with a conventional stuffing box and blowout preventer or directly mounted eliminating the stuffing box. The direct mount arrangement results in the pump barrel seals serving the stuffing box function. With such a direct mount arrangement, when the hydraulic cylinder is serviced to change out the seals it is necessary to shut in the well and support the rod string during the servicing.
SUMMARY OF THE INVENTION
The improved wellhead of the present invention provides the structure required to supply the stuffing box and pump rod support functions when utilizing a well pumping system such as the Tieben Pumping Unit. In accordance with the invention, a wellhead is provided which includes a pump rod string hanger having a safety lock, a cylindrical rod seal for sealing around the rod string in the wellhead, and a blowout preventer having rams which may function as a master valve co-acting with the rod string or may seal on zero in the event of breakage of the rod string allowing the rod string to drop below the wellhead.
REFERENCES:
patent: 4600054 (1986-07-01), Miller et al.
patent: 4762473 (1988-08-01), Tieben
patent: 5860478 (1999-01-01), Coutts et al.
patent: 5944111 (1999-08-01), Bridges
patent: 6000469 (1999-12-01), Bassinger
Bagnell David
Double-E Inc.
Hawkins Jennifer M
Jenkens & Gilchrist
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