Device for measuring resistivity in a wellbore

A device for measuring resistivity adapted to be mounted on a downhole tool intended to be lowered in a wellbore and comprising:

• a watertight body,
• a first electrode, a second electrode electrically insulated from the first electrode and surrounding the first electrode with respect to a reference axis of the device, and a third electrode insulated from the first and second electrodes and disposed between the first and the second electrodes so that the electrodes are concentric electrodes, arranged in the body at a proximal end of the device relative to the reference axis, wherein the first, second and third electrodes are used to perform resistivity measurements,
• an electrical connecting module arranged in the body and comprising a first contacting element electrically coupled to the first electrode, a second contacting element electrically coupled to the second electrode and a third contacting element electrically coupled to the third electrode,
• wherein the second contacting element has a generally hollow cylindrical shape, and is configured so that it surrounds the first contacting element with respect to the reference axis, with interposition of an electrically insulating material between the first and second contacting element,
• wherein the third contacting element is arranged between the first and second contacting elements with interposition of an electrically insulating material on each side of the third contacting element, wherein the third contacting element has a generally hollow cylindrical shape, and is positioned so as to surround the first contacting element wherein the second contacting element is configured to surround the third contacting element;
• wherein the contacting elements projects from the body at a distal end of the device so as to form an electrical interface.