Top drive washpipe system

Inactive Publication Date: 2008-09-25
NAT OILWELL VARCO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention, in certain aspects, provides a shaft sealing assembly in which an auxiliary shaft rotated by a rotating main shaft is connected to and rotates with the shaft via a speed reducer, e.g., a gear drive apparatus, between the main shaft and the auxiliary shaf

Problems solved by technology

Due to the high pressures and surface speeds involved in this arrangement, service life of the washpipe packing is limited.
Drilling fluid

Method used

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  • Top drive washpipe system
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Examples

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Example

[0025]Presently preferred embodiments of the invention are shown in the above-identified figures and described in detail below. Various aspects and features of embodiments of the invention are described below and some are set out in the dependent claims. Any combination of aspects and / or features described below or shown in the dependent claims can be used except where such aspects and / or features are mutually exclusive. It should be understood that the appended drawings and description herein are of preferred embodiments and are not intended to limit the invention or the appended claims. On the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims. In showing and describing the preferred embodiments, like or identical reference numerals are used to identify common or similar elements. The figures are not necessarily to scale and certain features and certain views of ...

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PUM

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Abstract

A top drive system for wellbore operations, the top drive system, in at least certain aspects, including a motor, a main shaft driven by the motor, the main shaft having a top end and a bottom end, a speed reduction system interconnected with the main shaft, a washpipe shaft interconnected with the speed reduction system for driving the washpipe shaft at a speed of rotation less than a speed of rotation of the main shaft. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.P.R. 1.72(b).

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present invention and the application for this patent claim priority under the U.S. Patent law §120 of U.S. Application Ser. No. 60 / 902,798 filed Feb. 22, 2007.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention is directed to wellbore drilling top drive systems; to washpipe apparatuses for such systems; and to sealing systems for rotating members.[0004]2. Description of Related Art[0005]Drilling fluids are transmitted to drilling swivels and top drive drilling systems through a high-pressure swivel apparatus known as a “washpipe” with a seal known as a “washpipe packing” assembly. This packing assembly consists of a tubular component which is held stationary, and through which the drilling fluid flows under high pressure. A rotating seal assembly of contact lip seals is mechanically fixed to and rotates with the main shaft of the top drive or swivel, and forms a dynamic seal against the outer surface of the ...

Claims

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Application Information

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IPC IPC(8): E21B3/00
CPCE21B33/02E21B21/02
Inventor STUBSTAD, SVEIN
Owner NAT OILWELL VARCO LP
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