The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2003
Filed:
Aug. 20, 2001
Alan Martyn Eddison, Stonehaven, GB;
Ronnie Hardie, Portlethen, GB;
Andergauge Limited, Scotland, GB;
Abstract
Downhole flow pulsing apparatus comprises a housing ( ) for location in a drillstring, the housing ( ) defining a throughbore to permit passage of fluid through the housing. A valve ( ) is located in the bore and defines a flow passage ( ). The valve includes a valve member ( ) which is movable to vary the area of the passage ( ) to provide a varying fluid flow therethrough. A fluid actuated positive displacement motor ( ) is associated with the valve member ( ). In a preferred embodiment, the apparatus is provided in combination with a drill bit ( ) and a pressure responsive device, such as a shock-sub ( ), which expands or retracts in response to the varying drilling fluid pressure created by the varying flow passage area. The expansion or retraction of the shock-sub ( ) provides a percussive effect at the drill bit.