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:
Mar. 06, 1990
Filed:
May. 09, 1988
Applicant:
Inventor:
Rainer Jurgens, Celle, DE;
Assignee:
Eastman Christensen Company, Salt Lake City, UT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V / ; E21B / ; E21B / ;
U.S. Cl.
CPC ...
175232 ; 166320 ; 367 83 ; 367 85 ;
Abstract
An apparatus for producing pressure pulses in an oil well fluid medium is established which includes a main valve member moveable relative to a supporting member by a pressure gradient between two flow channels. The main valve body is longitudinally moveable relative to the supporting body, and a gap is provided between the two bodies. The gap is opened for fluid flow which prevents the development of dead water zones and the buildup of sedimentary deposits to prevent restriction of movement between the two bodies. The gap includes one or more throttle zones to assist in maintaining the necessary gradient between the two flow channels.