Halliburton Energy Services, Inc.

Alexei Korovin

Anand Prakash

James Howell Cobb

Michael John Levchak

Kazi M Rashid

Jesse Kevin Hensarling

Brian Allen Mohon

James H Cobb

Michael S Bittar

Jin Ma

Imran Sharif Vehra

Aspects of the subject technology relate to systems and methods for packing nuclear magnetic resonance ('NMR') antennas for an NMR sensor. Specifically, a magnetic shielding layer of the NMR sensor can be formed in a first concentric layer about a mandrel of a downhole tool. A first antenna of a plurality of antennas of the NMR sensor can be formed in a second concentric layer on top of the first concentric layer through an automated machining process. Further, a second antenna of the plurality of the antennas of the NMR sensor can be formed in a third concentric layer on top of the second concentric layer through the automated machining process.

Nuclear magnetic resonance antenna packing

Logging downhole exposes components of logging tools, for example, antennas to abrasive and erosive operating conditions. A protective sleeve may disposed about an antenna assembly to protect the antenna assembly for the downhole operating conditions. To permit transmission and receipt of signals by and too the antenna assembly, slots are formed or disposed in the protective sleeve. A non-conductive composite insert is formed in the slots to protect the internal components of the protective sleeve, for example, the antenna assembly, from the operation conditions. A non-conductive composite inner liner is formed in an annulus of the protective sleeve and adheres to the protective sleeve and the non-conductive composite insert. The non-conductive component insert and inner liner allow signals to be transmitted and received by the antenna assembly so that logging operations can be completed without undue delay and the expense of repairing or replacing worn or damaged components.

Molded composite inner liner for metallic sleeves

A tool that uses antennas to evaluate an environment surrounding a borehole, the tool including an antenna assembly, and the antenna assembly including a body with a longitudinal central axis, and an antenna mounted on the body in a continuous groove comprising a plurality of circumferential portions and a plurality of transition portions, with each of the circumferential portions being formed in a plane and each of the planes being spaced apart from each other and parallel to each other; and with each of the circumferential portions at least partially extending circumferentially around the body within its respective plane and each of the transition portions transitioning the groove from an end of one of the circumferential portions to an end of an adjacent one of the circumferential portions.

Parallel coil paths for downhole antennas

A compact sub assembly and well measurement system. The compact sub assembly may comprise a deep transmitter disposed about one end of the compact sub assembly, a shallow dual transmitter disposed on the compact sub assembly between the deep transmitter and a second end of the compact sub assembly, a shallow dual-collocated receiver disposed on the compact sub assembly between the deep transmitter and a second end of the compact sub assembly, and a deep receiver disposed about the second end of the compact sub assembly. A well measurement system for decoupling a component signal may comprise a logging tool. The logging tool may comprise a first sub assembly and a conveyance attached to the logging tool. In examples the first sub assembly is a compact sub assembly comprising a deep transmitter, a shallow dual transmitter, a shallow dual-collocated receiver, and a deep receiver.

Compact logging while drilling look around and look ahead tool

A wearable sleeve to protect a sensor coupled to an object. The wearable sleeve having an axial axis, a longitudinal axis substantially perpendicular to the axial axis, a first wearable sleeve end and a second wearable sleeve end opposite the first wearable sleeve end. A first ring coupled to the first end of the first wearable sleeve end and a second ring coupled to the second wearable sleeve end. The first ring and the second ring have the same expansion properties as the object.

Wear sleeve

A single layer antenna path profile is provided. An antenna assembly for the single layer antenna profile includes a bobbin having a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis. The antenna assembly also includes one or more channels defined in the outer radial surface. In some aspects, each channel is defined by a continuously curved inner surface having a constant radius. In some aspects, the inner surface extends more than 180 but less than 360 and thereby defines an opening in the body. The antenna assembly also includes a coil including a wire wrapped about the bobbin and received within the one or more channels. In some aspects, an arcuate portion of the wire extends through the opening such that a portion of the wire protrudes out of the channel.

Single layer antenna path profile

An antenna assembly that includes a bobbin including arcuate first and second bobbin portions positioned about a tool mandrel. A protective layer is formed about the first and second bobbin portions, and a cover occludes a portion of an axially extending gap defined between the first and second bobbin portions to prevent the protective layer from extruding into the gap.

Antenna designs for wellbore logging tools

Wellbore logging tools can include a coil antenna assembly that prevents breakage of a coil wire during downhole use under elevated pressure. The antenna assembly can include an insulator base used to help insulate the wires so elevated downhole pressures do not result in a short to a tool mandrel. The insulator base provides a recessed path for the in/out portions of the wire so manufacturing fixtures of the antenna assembly will not damage them.

Insulator base for antenna assemblies

An antenna assembly includes a bobbin positionable about an outer surface of a tool mandrel, and a coil wrapped about an outer bobbin surface of the bobbin and extending longitudinally along at least a portion of the outer bobbin surface. A plurality of ferrites are positioned within a groove defined in the outer surface of the tool mandrel, and the plurality of ferrites extend circumferentially about the outer surface and interpose the tool mandrel and the coil.

Antenna assemblies using ferrites for wellbore logging tools and a method of manufacturing

A system to protect a downhole antenna from fluid penetration, in some embodiments, comprises a collar; a bobbin antenna, mounted on the collar, including multiple coil slots on an outer surface of the bobbin antenna and including one or more intra-bobbin wireways between at least one of the coil slots and an outlet of the bobbin antenna; and a collar wireway that is dedicated to the bobbin antenna.

Dedicated wireways for collar-mounted bobbin antennas

An antenna assembly for wellbore logging tools is provided. The antenna assembly includes a coil wrapped about an outer surface of a bobbin positioned within a saddle of a tool mandrel. The antenna assembly also includes an inner sleeve positioned on an outer surface of the tool mandrel within the saddle, the inner sleeve being interposed between the coil and the tool mandrel. The antenna assembly also includes a plurality of ferrite channels formed within a groove defined in an inner surface of the inner sleeve, in which the plurality of ferrite channels being laterally separated by a plurality of dividers formed in the groove. The antenna assembly also includes a plurality of ferrites disposed within respective ones of the plurality of ferrite channels.

Antennas for wellbore logging tools having a plurality of ferrite channels orthogonal to the plurality of winding grooves

Mechanisms for induction-based resistivity measurements can be provided for use in geo-steering in a drilling operations environment. An antenna assembly can provide effective protection for antenna sections without hindering propagation of electromagnetic signals. The antenna assembly can include a bobbin disposed about a collar of a tool string; an antenna disposed on an outer surface of the bobbin; an outer adhesive layer covering the antenna and at least a portion of the bobbin; and a protective layer disposed against the outer adhesive layer; wherein the outer adhesive layer fills a space radially between the bobbin and the protective layer.

Buildup and encapsulation of antenna section of downhole tool

A collar-mountable antenna for transmitting and receiving signals in a downhole environment, in at least some embodiments, comprises a bobbin having an inner surface and an outer surface, each of the inner and outer surfaces defining multiple slots, conductive wire disposed within the multiple slots on the outer surface of the bobbin, and ferrite disposed within the multiple slots on the inner surface of the bobbin.

Collar-mountable bobbin antenna having coil and ferrite slots

An antenna assembly includes a bobbin positionable about an outer surface of a tool mandrel and providing an outer bobbin surface. A coil is wrapped about and extends longitudinally along at least a portion of the outer bobbin surface. An inner sleeve interposes the bobbin and the tool mandrel and receives a plurality of ferrites that interpose the tool mandrel and the coil.

Growing community of inventors

Houston, TX, United States of America

Alexei Korovin