Abstract: A drill stem element for drilling a well with flow of a drilling fluid around the element and in a direction extending from a drilling well bottom towards the surface, including a member and a coupling mounted for rotation about the member. The coupling includes at least two abutment zones on a wall of the well during drilling, each abutment zone externally includes at least one abutment portion having an outer diameter greater than a diameter of other portions of the element, each abutment zone having a convex rounded shape generated by revolution, each abutment zone being axially remote from at least one other abutment zone. The coupling further includes an intermediate zone between the two abutment zones, an opening being provided between the coupling and the member for the flow of drilling fluid between the coupling and the member forming a fluid bearing.

Abstract: A tubular component for oil exploration includes an electromagnetic half-coupler that can be coupled to a half-coupler of another tubular component to allow data transmission, wherein an end portion of the tubular component includes a housing accommodating the half-coupler, the half-coupler including a coupling element and an annular armature for the coupling element, the coupling element including an annular body formed from a material with a high magnetic permeability and an electrical conductor having turns, the armature including a first portion and a second portion configured to accommodate the coupling element, the armature being partially surrounded by an isolating and impervious material to protect the half-coupler against infiltration.

Abstract: A component for a drill stem including a tubular body with at least one first end zone and a second end zone. The component includes a sheath for passage of a cable extending inside the tubular body between the first end and the second end zone and at least one liner which lines at least a portion of the inside of the tubular body in the first end zone. At least a first end portion of the sheath includes a first threading. The liner supports a second threading. The first and second threading are screwed together.

Abstract: A tubular component for a drill stem, for drilling a hole, the component including a first end section including a first threading, a second end section including a second threading, and a substantially tubular central section, a hole being provided in at least one of the first and second end sections, and a tensioner for a communications tube disposed in the hole, the tensioner operating by deformation of a regular section of the communications tube, the tensioner being disposed in a housing provided in at least the section, at a distance from the ends of the communications tube, the housing intersecting with the hole.

Abstract: A drill-string liner element includes at least one hardbanding layer. The hardbanding layer includes one or more strands of filler metal, each having a width between 1 and 5 millimeters and deposited in adjacent manner to form a substantially continuous layer over a zone of the element. The hardness in the thickness of the layer varies by less than 10 HRC over the zone.

Abstract: A tubular component for a drill stem that can be cabled includes a first end zone, a second end zone, a sheath, the sheath extends between the first end zone and the second end zone, and a liner fixed in a bore of the first end zone. The liner includes at least one take-up chamber for a cable disposed in the sheath.

Abstract: A rotary drill stem for a well including a central tubular element, and first and second connectors each including a threaded portion that can connect the element to another element. At least one of the connectors includes a chamber in communication with a pressure outside the chamber. The connector includes an annular signal transmission coupler. The annular coupler includes a ring having an annular coupling surface. The coupler includes an insulating support that leaves the annular coupling surface free. The coupler includes a piston surface axially opposite to the annular coupling surface. The annular coupler forms a piston.

Abstract: A pair of contact or capacitive HF couplers for drill stem components. Each of the first and second couplers includes a central conductor, a supplemental conductor, and an annular dielectric mechanism. The dielectric mechanism is disposed between the conductors. The conductors are isolated from each other. The supplemental conductor includes two electrical contact surfaces. The central conductor includes an electrical contact surface or electrode such that the couplers are capacitive. The central conductors of the first and second couplers interact electrically in the coupled state. The supplemental conductors of the first and second couplers are in electrical contact in the coupled state. The supplemental conductors surround the central conductors. In the mounted state, the supplemental conductors form a shielding for the central conductors.

Abstract: A coupler for coupling a first and a second section of a transmission line embedded in a first and a second component respectively, includes a first half-coupler including a first electrically conductive housing, a first electrically conductive structure, and a first structure of dielectric material, and a second half-coupler including a second electrically conductive housing, a second electrically conductive structure, and a second structure of dielectric material. When the first and second components are connected end-to-end, the first and second housings come into contact to form together an electromagnetic cavity, inside which the first and second conductive structures are separated from each other by the first and second dielectric structures, so as to allow the first and second conductive structures to be in electromagnetic communication with each other.

Abstract: Tubular drill string component for drilling a hole with circulation of a drilling fluid around the component and in a direction going from a drill hole bottom to the surface. The component includes a first end including a female threading, a second end including a male threading, and a substantially tubular central zone. The component includes a communication tube arranged at least in the central zone and in contact with a bore of the central zone. A signal transmission cable is arranged in the tube. The communication tube includes a body formed from at least one metal strip arranged with an annular component. The body includes, in section along a plane passing through the axis of the tube, at least two axially elongated lengths, partially overlapping one another with an axial play selected to accommodate the maximum elastic deformation of the component under axial compressive and/or bending stress.

Abstract: A drill string element including a main pipe with connection ends and a protective mechanism for at least one wire. The protective mechanism extends within a central bore of the main pipe. The main pipe presents a first hole in one of the connection ends and a second hole in the other connection end, both holes communicating with the central bore. The protective mechanism includes a guide tube arranged for housing the wire, both ends of which being respectively disposed within the first hole and the second hole. A retaining mechanism is arranged in at least one of the first hole and the second hole for the respective end of the guide tube. The retaining mechanism is configured to prevent the respective end of the guide tube from moving relative to the one of the first hole and the second hole according to at least one longitudinal direction of the hole.

Abstract: A stabilizer device (20, 120, 220) for a drill stem, in particular for a bottom hole assembly, which is rotatable about a longitudinal axis (X), the device comprising a tubular central body (21) and connection means (22, 23) at its axial ends for connecting to elements of the stem, the device being provided with a helical protrusion (24, 25, 26) on the surface of the body intended to come into contact with a wall of the drilled hole, said helical protrusion turning in the clockwise direction (W) about the axis of the central body viewed from an upstream axial end in the direction of a downstream axial end, characterized in that a crest (33, 33?, 33?) of the helical protrusion comprises a leading edge (35, 35? and 35?) and a trailing edge (36, 36? and 36?) defined in the direction of rotation, the leading edge comprising a convex portion such that a first portion (38) of said convex portion has a radius of curvature of more than 3.5 mm over an angular arc of at least 20°.

Abstract: A component for a drill stem including a tubular body with at least one first end zone and a second end zone. The component includes a sheath for passage of a cable extending inside the tubular body between the first end and the second end zone and at least one liner which lines at least a portion of the inside of the tubular body in the first end zone. At least a first end portion of the sheath includes a first threading. The liner supports a second threading. The first and second threading are screwed together.

Abstract: A tubular component for a drill stem, for drilling a hole, the component including a first end section including a first threading, a second end section including a second threading, and a substantially tubular central section, a hole being provided in at least one of the first and second end sections, and a tensioner for a communications tube disposed in the hole, the tensioner operating by deformation of a regular section of the communications tube, the tensioner being disposed in a housing provided in at least the section, at a distance from the ends of the communications tube, the housing intersecting with the hole.

Abstract: A drill stem element for drilling a well with flow of a drilling fluid around the element and in a direction extending from a drilling well bottom towards the surface, including a member and a coupling mounted for rotation about the member. The coupling includes at least two abutment zones on a wall of the well during drilling, each abutment zone externally includes at least one abutment portion having an outer diameter greater than a diameter of other portions of the element, each abutment zone having a convex rounded shape generated by revolution, each abutment zone being axially remote from at least one other abutment zone. The coupling further includes an intermediate zone between the two abutment zones, an opening being provided between the coupling and the member for the flow of drilling fluid between the coupling and the member forming a fluid bearing.