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. 15, 1977
Filed:
Mar. 31, 1975
William B Nelligan, Danbury, CT (US);
Schlumberger Technology Corporation, New York, NY (US);
Abstract
In the particular embodiments described, a telemetering system for well logging receives and temporarily stores binary-coded parallel data in a downhole memory unit and continuously interrogates and transmits the stored data to the surface at fixed rate in binary-coded serial format. The system thus accommodates high instantaneous data-generation rates, such as are encountered, for example, in gamma ray spectroscopy tools, without loss of information on the cable. The stored data is compacted, by suppressing leading zeros in data words, prior to application to the cable. This affords faster memory read-out and reduces cable transmission time. The data word format and signal format utilized on the cable provide low error-rate data flow to the surface, as well as facilitating the maintenance of synchronous operation between downhole and uphole functions. In one embodiment, the system also includes multiplexed access to the memory unit for data generated both at random and at predetermined intervals, thereby enabling different types of information to be obtained with a single logging tool.