Weatherford/lamb, Inc.

Other

Robert E Smallwood

James William Haslett

Frederick N Trofimenkoff

Marvin L Holbert

Paul L Camwell

Derek W Logan

Michael Nero

Tony Dopf

Clemens Horst

A compact, robust, wear resistant, and high performance electrically insulating gap sub for use with borehole EM Telemetry is disclosed. In one embodiment, the gap sub may include an externally threaded mandrel separated from an internally threaded housing by a dielectric material. Additionally, some embodiments may include an external gap ring for separating the upper and lower electrical halves of the sub which offers structural support, acts as the primary external seal, and provides an abrasion resistant non-conductive length on the exterior. Some embodiments may include torsion pins to prevent the possible unscrewing of the dielectric filled threaded sections should the dielectric material become damaged or weakened.

Electromagnetic gap sub assembly

An insulator for a subsurface signal transmitting apparatus. The insulator includes a housing, a mandrel axially disposed inside the housing, a first insulating material disposed between the housing and the mandrel, a first sleeve formed of a second insulating material disposed between the housing and a first tubular member and the first tubular member coupled to the mandrel.

Subsurface signal transmitting apparatus

A subsurface signal transmitting apparatus including an insulation coupler, a carrier device for mounting the telemetry instrumentation, and a by-pass system for avoiding pressure build-up either above or below the apparatus. The insulation coupler includes a housing member having a central opening defined by an interior surface extending in the longitudinal direction and a mandrel member having an exterior surface spaced from the interior surface of the housing member to provide a gap or clearance with an insulating bonding material occupying the clearance. The surfaces are oriented so that when the coupling is in tension at least a portion of the two surfaces experience interacting forces towards each other in the longitudinal direction of the coupling and in event of failure of the bonding material, the mandrel member is unable to withdraw from the housing member. The by-pass system includes a by-pass tube which extends through central openings of the insulation coupler and carrier device and provides for electrically insulating one end of the assembly from the other but allows for pressure equalization via a fluid passageway. The carrier device has a cylindrical body forming external channels for concealing instruments about is circumference.

The subsurface signal transmitting apparatus ( ) including an insulation coupler ( ), a carrier device ( ) for mounting the telemetry instrumentation ( ), and a by-pass system for avoiding pressure build-up either above or below the apparatus. The insulation coupler ( ) includes a housing member ( ) having a central opening ( ) defined by an interior surface ( ) extending in the longitudinal direction and a mandrel member ( ) having an exterior surface ( ) spaced from the interior surface ( ) of the housing member ( ) to provide a gap or clearance ( ) with an insulating bonding material ( ) occupying the clearance. The surfaces are oriented so that when the coupling is in tension at least a portion of the two surfaces that when the coupling is in tension at least a portion of the two surfaces experience interacting forces towards each other in he longitudinal direction of the coupling and in event of failure of the bonding material, the mandrel member is unable to withdraw from the housing member. The by-pass system includes a by-pass tube ( ) which extends through central openings ( ) of the insulation coupler ( ) and carrier device ( ) and provides for electrically insulating one end of the assembly from the other but allows for pressure equalization via a fluid passage-way ( ). The carrier device ( ) has a cylindrical body ( ) forming external channels ( ) for concealing instruments ( ) about its circumference.

A subsurface signal transmitting apparatus including an insulation coupler, a carrier device for mounting the telemetry instrumentation, and a by-pass system for avoiding pressure build-up either above or below the apparatus. The insulation coupler includes a housing member having a central opening defined by an interior surface extending in the longitudinal direction and a mandrel member having an exterior surface spaced from the interior surface of the housing member to provide a gap or clearance with an insulating bonding material occupying the clearance. The surfaces are oriented so that when the coupling is in tension at least a portion of the two surfaces experience interacting forces towards each other in the longitudinal direction of the coupling and in event of failure of the bonding material, the mandrel member is unable to withdraw from the housing member. The by-pass system includes a by-pass tube which extends through central openings of the insulation coupler and carrier device and provides for electrically insulating one end of the assembly from the other but allows for pressure equalization via a fluid passage-way. The carrier device has a cylindrical body forming external channels for concealing instruments about its circumference.

Growing community of inventors

Calgary, Canada

Robert E Smallwood