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US 6,543,533 B2Granted
Well tubing rotator
AssigneeDuhn Oil Tool, Inc.
InventorsRobert K. Meek, Rex E. Duhn
Life of this patent
Estimating the term…
Abstract
A mandrel rotator is provided is mounted in a housing for coupling to a well casing head. The mandrel rotator comprises of an annular gear having external gear teeth and an axial opening. The annular gear is coupled to a mandrel outer surface, such that rotation of the annular gear causes rotation of the mandrel. A retainer limits or prevents axial movement of gear within the housing. A second gear is coupled to the annular gear for rotating the annular gear.
Claims42
A well tubing rotator system comprising:
- a casing head;
- a mandrel rotatably mounted within the casing head, the mandrel having an inner opening and an outer surface, wherein a portion of the outer surface is polygonal having more than two sides, wherein an outer angle formed between every pair of adjacent sides is greater than 180°;
- a housing mounted on the well casing head, the housing comprising an axial opening, wherein a portion of the mandrel is surrounded by the casing head and a portion of the mandrel is surrounded by the housing;
- an annular gear comprising external teeth and an axial opening having a polygonal portion, the gear fitted within the housing axial opening and in surrounding relationship to the mandrel, wherein the polygonal portion of the opening of the gear surrounds the polygonal outer surface portion of the mandrel;
- and
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear.
3 more elements
A well tubing rotator system comprising:
- a casing head;
- a mandrel rotatably mounted within the casing head, the mandrel having an inner opening and an outer surface, wherein a portion of the outer surface is polygonal;
- a housing mounted on the well casing head, the housing comprising an axial opening, wherein a portion of the mandrel is surrounded by the casing head and a portion of the mandrel is surrounded by the housing;
- an annular gear comprising external teeth and an axial opening having a polygonal portion, the gear fitted within the housing axial opening and in surrounding relationship to the mandrel, wherein the polygonal portion of the opening of the gear surrounds the polygonal outer surface portion of the mandrel;
- and
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear, wherein the housing axial opening comprises four coaxial sections, a first section extending to an end of the housing furthest from the well casing head and having a first diameter, a second section extending from the first section and having a second diameter greater than the first diameter, a third section extending from the second section having a third diameter greater than the second diameter, and a fourth section extending from the third section having a fourth diameter greater than the third diameter, wherein a housing first annular shoulder is defined on the third section extending to the second section, and wherein a housing second annular shoulder is defined on the fourth section extending to the third section.
3 more elements
A well tubing rotator system comprising:
- a casing head;
- a mandrel rotatably mounted within the casing head, the mandrel having an inner opening and an outer surface, wherein a portion of the outer surface is polygonal;
- a housing mounted on the well casing head, the housing comprising an axial opening, wherein a portion of the mandrel is surrounded by the casing head and a portion of the mandrel is surrounded by the housing;
- an annular gear comprising external teeth and an axial opening having a polygonal portion, the gear fitted within the housing axial opening and in surrounding relationship to the mandrel, wherein the polygonal portion of the opening of the gear surrounds the polygonal outer surface portion of the mandrel;
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear;
- a hanger fitted within the well casing head wherein the mandrel is coupled to the hanger, wherein a portion of the mandrel extends beyond the hanger in a direction away from the annular gear;
- a retainer coupled to said mandrel portion extending beyond the hanger for retaining said mandrel portion extending beyond the hanger;
- and wherein the retainer is retainer nut threaded on threads formed on the outer surface of Said portion extending beyond the hanger.
5 more elements
A well tubing rotator system for rotating a well mandrel having a polygonal outer surface section, the system comprising:
- a housing for mating with a well casing head, the housing comprising an axial opening;
- an annular gear having an axial opening having a polygonal portion for fitting over the polygonal outer surface section of the mandrel, wherein the polygonal portion comprises more than two sides, wherein an inner angle formed between every pair of adjacent sides is less than 180°, and wherein the gear is fitted within the housing axial opening;
- and
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear.
1 more element
A well tubing rotator system for rotating a well mandrel having a polygonal outer surface section, the system comprising:
- a housing for mating with a well casing head, the housing comprising an axial opening;
- an annular gear having an axial opening having a polygonal portion for fitting over the polygonal outer surface section of the mandrel, the gear fitted within the housing axial opening;
- and
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear, wherein the housing axial opening comprises four coaxial sections, a first section extending to an end of the housing and having a first diameter, a second section extending from the first section and having a second diameter greater than the first diameter, a third section extending from the second section having a third diameter greater than the second diameter, and a fourth section extending from the third section having a fourth diameter greater than the third diameter, wherein a housing first annular shoulder is defined on the third section extending to the second section, and wherein a housing second annular shoulder is defined on the fourth section extending to the third section.
1 more element
A well tubing rotator system for rotating a well mandrel, the system comprising:
- a housing for mating with a well casing head, the housing comprising an axial opening;
- an annular gear for driving the mandrel, said annular gear, wherein said annular gear is fitted within the housing axial opening;
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear;
- and
- a retainer within the housing located below the annular gear and interfacing with the annular gear via a reduced friction surface, wherein the reduced friction surface reduces rotational friction between the annular gear and the retainer.
2 more elements
A well tubing rotator system comprising:
- a casing head;
- a mandrel rotatably mounted within the casing head, the mandrel having an inner opening and an outer surface, wherein a portion of the outer surface is polygonal;
- a housing mounted on the well casing head, the housing comprising an axial opening, wherein a portion of the mandrel is surrounded by the casing head and a portion of the mandrel is surrounded by the housing;
- an annular gear comprising external teeth and an axial opening having a polygonal portion, the gear fitted within the housing axial opening and in surrounding relationship to the mandrel, wherein the polygonal portion of the opening of the gear surrounds the polygonal outer surface portion of the mandrel;
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear;
- and
- an annular retainer below the annular gear, the annular surrounding the mandrel, wherein the annular gear is sandwiched between the housing and the annular retainer.
4 more elements
A well tubing rotator system for rotating a well mandrel having a polygonal outer surface section, the system comprising:
- a housing for mating with a well casing head, the housing comprising an axial opening;
- an annular gear having an axial opening having a polygonal portion for fitting over the polygonal outer surface section of the mandrel, the gear fitted within the housing axial opening;
- a second gear coupled to the annular gear, wherein rotation of the second gear causes rotation of the annular gear;
- and
- a retainer below the annular gear, wherein the annular gear is sandwiched between the housing and the retainer.
2 more elements
Dependencies are inferred from the claim text.