ApplicationNo. 06/718543 filed on 04/01/1985
US Classes:175/46, Signaling or indicating condition of cutting in cuttings retainer175/244, WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE175/58Sampling of earth formations
ExaminersPrimary: Novosad, Stephen J.
Assistant: Kisliuk, Bruce M.
Attorney, Agent or Firm
International ClassesE21B 25/00 (20060101)
E21B 45/00 (20060101)
AbstractA well coring apparatus is provided with the capability for monitoring the length of the core in the inner barrel (32) of a core barrel (16) and the rate at which the core enters the inner barrel (32). The device includes a Sonic Core Monitor (78) which is disposed in the upper end of the inner barrel (32) and a piston (68) which is disposed in the lower end thereof. The Sonic Core Monitor (78) generates an ultrasonic pulse that is transmitted down to the surface of the piston (68) and reflected back up to the Sonic Core Monitor (78). The time between the transmitted and received pulse is then measured and distance determined therefrom. Both length of core and rate of core entry into the inner barrel (32) can then be determined. If the core is proceeding at too slow a rate, a valve (50) can be opened to allow drilling fluid to bypass the core barrel (16). This provides the surface operator with an indication that a jam has occurred.
Field of SearchCombined with earth removal (e.g., removing sample)
Providing identifiable indication of core position in situ for core sample orientation
Signaling or indicating condition of cutting in cuttings retainer
Sampling of earth formations
WITH MEANS MOVABLE RELATIVE TO TOOL TO RECEIVE, RETAIN, OR SEVER UNDISTURBED CORE