Mechanism helping to make traction on flat surface and non-flat surface

A towed, link mechanism technology, used in mechanical equipment, construction, earth-moving drilling, etc., can solve the problems of not allowing the pipe diameter and the inability to pull the system through the casing connection.
CN1495335AInactive Publication Date: 2004-05-12SCHLUMBERGER OVERSEAS SA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SCHLUMBERGER OVERSEAS SA
Publication Date
2004-05-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A six-bar linkage mechanism for conforming to the configuration of a tractored surface having a central link defined by a tool body and a saddle link spaced from the central link and movable for conforming with the tractored surface. A pair of front links each having pivotal connection with respective ends of the saddle link and having linearly movable pivotal connection with the central link to permit angular and spacing changes of the saddle link relative to the central link. A pair of centralizer links are located between the front links and have pivotal connections with the saddle link and pivotal connections with the central link. One of the pivotal connections is linearly movable on the central link. For tractor tools, when the tractored surface is a wellbore or well pipe, a plurality of six-bar linkages radiate from a tool body for surface conforming traction with the tractored surface.
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Description

[0001] This application claims priority to US Provisional Application 60 / 369,385, filed April 2, 2002, which is incorporated herein by reference. 【Technical field】

[0002] The invention relates to a traction mechanism used in wells. More particularly, the present invention relates to a mechanism for traction in wells having flat and uneven surfaces that adjusts or changes its configuration according to the internal surface configuration of the wellbore, well casing or tubing over which it is moved , to aid in traction. Even more particularly, the invention finds particular application in the field of wellbore tractors for conveying logging and maintenance tools in deviated or horizontal oil and gas wells or pipelines where such tools are not conveniently carried by gravity delivery. 【Background technique】

[0003] US4557327 discloses a rolling arm centering mechanism in the form of a four-bar linkage mechanism. A disadvantage of this mechanism for traction is that the fo...

Claims

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