Patent ID: 8556000
Filing Date: 2013-10-15
Classification: E21B

Abstract:
1. A device comprising autonomous passive downhole measurement equipment for autonomously measuring, monitoring and storing for subsequent analysis parameters of a drilling or coring operation by means of a drillbit fixed to an end of a drill string, comprising a coupling co-axially and removably interposed between two drill string pipes or between the drillbit and a drill string pipe, wherein the measurement equipment is compact and is housed in at least one compact chamber in the coupling, wherein the coupling is cylindrical and the or each chamber includes a groove made on the periphery of the coupling, and wherein the measurement equipment includes at least two measurement components radially superposed in the or each groove in a direction transverse to the axis of symmetry of the coupling, wherein the two components comprise at least one strain gauge, and an electronic circuit placed radially above the strain gauge, and wherein the electronic circuit includes a regulating member for automatically starting up the measurement equipment or for automatically putting it on standby.