Device for monitoring a drilling or coring operation and installation comprising such a device

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 at least one chamber and the or each groove are annular and further comprising an annular sleeve to close off the groove and the superposed components of the measuring equipment.

A device comprising autonomous monitoring equipment for measuring and storing, for subsequent analysis, downhole parameters of a drilling or coring operation by means of a drillbit fixed to the end of a drill string, wherein the measurement equipment is housed in at least one chamber made in a coupling that is designed to be interposed between the drillbit and a first, in use lowermost, drill string pipe such that the coupling is located in the immediate vicinity of the drillbit, wherein the coupling is cylindrical and the chamber includes an annular groove made on the periphery of the coupling, wherein the measurement equipment includes at least two measurement components that are radially superposed in the groove in a direction transverse to the axis (X) of symmetry of the coupling such that one of the at least two components is further away from the rotation axis (X) of the coupling and is on top of the other one of the at least two components, and wherein the coupling is engaged in a sheath that closes off the or each groove, the fastening of the sheath to the coupling is designed to allow the coupling to deform freely under the effect of an axial tensile force and/or an axial compressive force and/or a bending force and/or a twisting force.

A device comprising autonomous monitoring equipment for measuring and storing, for subsequent analysis, downhole parameters of a drilling or coring operation by means of a drillbit fixed to the end of a drill string, wherein the measurement equipment is housed in at least one chamber made in a coupling that is designed to be interposed between the drillbit and a first, in use lowermost, drill string pipe such that the coupling is located in the immediate vicinity of the drillbit, wherein the coupling is cylindrical and the chamber includes an annular groove made on the periphery of the coupling, wherein the measurement equipment includes at least two measurement components that are radially superposed in the groove in a direction transverse to the axis (X) of symmetry of the coupling such that one of the at least two components is further away from the rotation axis (X) of the coupling and is on top of the other one of the at least two components, wherein the other one of the at least two components comprises at least one strain gauge, which is place in the bottom of the groove, and the one of the at least two components comprises an electronic circuit placed above the strain gauge, and wherein the electronic circuit is placed on a bracket that straddles the strain gauge.

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, and wherein the coupling is engaged in a sheath that closes off the or each groove, the fastening of the sheath to the coupling is designed to allow the coupling to deform freely under the effect of an axial tensile force and/or an axial compressive force and/or a bending force and/or a twisting force.