US 6,640,892 B1Granted

Tubing string rotator

AssigneeGadu, Inc.

InventorAndrew J. Wright

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Abstract

A tubing string rotator is disclosed that comprises an outer housing, a gear mandrel, and a tubing string hanger. The outer housing has an internal bore extending from its upper to its lower. The gear mandrel is received and supported within the bore of the outer housing. The gear mandrel has an internal bore extending from its upper to its lower end. The tubing string hanger has a series of circumferentially positioned generally downwardly oriented teeth and is receivable and suspendable within the internal bore of the gear mandrel such that the teeth on the tubing string hanger engage a series of generally upwardly oriented teeth circumferentially positioned about the internal surface of the gear mandrel. Rotational force applied to the gear mandrel is at least partially transferred to the tubing string hanger through engagement of the teeth on the gear mandrel with the teeth on the hanger causing the tubing string hanger to rotate with the gear mandrel.

Claims18

Dependent claims

A tubing string rotator comprising:

(i) an outer housing having an upper end and a lower end with an internal bore extending therethrough from said upper to said lower end;
(ii) a gear mandrel receivable and supportable within said internal bore of said outer housing, said gear mandrel having an upper end and a lower end and an internal surface that defines an internal bore extending through said gear mandrel from said upper to said lower end;
and,
(iii) a tubing string hanger having an upper end, a lower end and an external surface, said external surface of said tubing string hanger having a series of circumferentially positioned generally downwardly oriented teeth, said tubing string hanger receivable and suspendable within said internal bore extending through said gear mandrel such that said teeth on said tubing string hanger engage a series of generally upwardly oriented teeth circumferentially positioned about said internal surface of said gear mandrel whereby rotational force applied to said gear mandrel is at least partially transferred to said tubing string hanger through engagement of said generally upwardly and said generally downwardly oriented teeth causing said tubing string hanger to rotate with said gear mandrel.

1 more element

A tubing string rotator comprising:

(i) an outer housing having a generally hollow interior and having an internal bore extending through said housing from an upper end to a lower end of said housing;
(ii) a gear mandrel receivable within said hollow interior of said outer housing, said gear mandrel having an upper end and a lower end and an internal surface that defines an internal bore extending through said gear mandrel from said upper to said lower end;
(iii) a drive gear engaging said gear mandrel such that rotation of said drive gear causes rotation of said gear mandrel about an axis generally parallel to said internal bore extending through said gear mandrel;
and,
(iv) a tubing string hanger receivable and suspendable within said internal bore of said gear mandrel, said tubing string hanger having an external surface having mounted thereon a plurality of circumferentially positioned generally downwardly oriented teeth, said generally downwardly oriented teeth engaging a plurality of compatibly shaped generally upwardly oriented teeth circumferentially positioned about said internal surface of said gear mandrel when said tubing string hanger is received within said gear mandrel such that said tubing string hanger may be rotated through the transference of rotational force applied to said gear mandrel to said tubing string hanger through engagement of said generally upwardly and said generally downwardly oriented teeth.

2 more elements

A tubing string rotator comprising:

(i) an outer housing having an upper end and a lower end, said lower end adapted to be received upon an oil well casing or wellhead, said outer housing having an internal bore extending therethrough from said upper end to said lower end;
(ii) a gear mandrel received and supported within said internal bore of said outer housing, said gear mandrel having an internal surface that defines an internal bore extending therethrough, said internal surface of said gear mandrel including a reduced diameter portion having circumferentially positioned thereabout a plurality of generally upwardly oriented teeth;
and,
(iii) a tubing string hanger receivable and suspendable within said internal bore through said gear mandrel, said tubing string hanger having an exterior surface containing a plurality of circumferentially positioned generally downwardly oriented teeth engagable with said generally upwardly oriented teeth of said gear mandrel when said tubing string hanger is received within said internal bore in said gear mandrel such that rotational force applied to said gear mandrel is at least partially transferred to said tubing string hanger through engagement of said generally upwardly and said generally downwardly oriented teeth causing said tubing string hanger to rotate with said gear mandrel, and wherein at least a portion of the weight of said tubing string hanger is transmitted to and borne by said gear mandrel through engagement of said generally upwardly and said generally downwardly oriented teeth.

1 more element

Dependencies are inferred from the claim text.