Closure device
A closure device connectible to a well head through which the polished rod of a rod string extends into a well tubing for operating pump means for moving well fluids to a surface flow conductor, the closure device having a tubular ram provided with a packing or plug for closing an annular passage between the polished rod and a tubular body connected to the well head above a lateral port of the tubular body, the tubular ram and the tubular body having thread means for moving the plug between an operative lower position wherein it closes the annular passage when the rod string is stationary and on inoperative upper position; seal means between the ram and the polished rod spaced above the plug; and a plurality of independent seal means between the ram and the tubular body operative when the plug is in its inoperative position. The plug of the closure device is especially adapted to operate under high temperature and pressure conditions of the well, as during steam injection operations when the rod string is stationary, to protect the seal means from high pressures and temperatures as well as any fluids which may be corrosive or otherwise deleterious to the substance of which the seal means are made.
- Assignee:
- EDB-86-014455
- Patent Number(s):
- US 4522368
- OSTI ID:
- 6322786
- Resource Relation:
- Patent File Date: Filed date 19 Dec 1983; Other Information: PAT-APPL-562821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
CLOSURES
NATURAL GAS WELLS
STEAM INJECTION
OIL WELLS
WELLHEADS
CORROSION RESISTANCE
DRILL PIPES
FLOW REGULATORS
MECHANICAL PROPERTIES
PUMPS
RODS
THERMODYNAMIC PROPERTIES
WELL CASINGS
WELL RECOVERY EQUIPMENT
CONTROL EQUIPMENT
DRILLING EQUIPMENT
EQUIPMENT
FIELD PRODUCTION EQUIPMENT
FLUID INJECTION
PHYSICAL PROPERTIES
PIPES
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing