SUBSURFACE SIGNAL TRANSMITTING APPARATUS

WIPO Patent Application WO1996041931

B1

A subsurface signal transmitting apparatus (10) including an insulation coupler (11), a carrier device (12) for mounting the telemetry instrumentation (75), and a by-pass system for avoiding pressure build-up either above or below the apparatus. The insulation coupler (11) includes a housing member (13) having a central opening (16) defined by an interior surface (22) extending in the longitudinal direction and a mandrel member (14) having an exterior surface (32) spaced from the interior surface (22) of the housing member (13) to provide a gap or clearance (33) with an insulating bonding material (29) 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 (120) which extends through central openings (3, 61) of the insulation coupler (11) and carrier device (12) and provides for electrically insulating one end of the assembly from the other but allows for pressure equalization via a fluid passage-way (121). The carrier device (12) has a cylindrical body (57) forming external channels (74) for concealing instruments (75) about its circumference.

HOLBERT MARVIN L (CA)
HASLETT JAMES W (CA)
SMALLWOOD ROBERT E (CA)
TROFIMENKOFF FREDERICK N (CA)

PCT/CA1996/000407

April 05, 2001

June 11, 1996

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MCALLISTER PETROLEUM SERVICES (CA)
HOLBERT MARVIN L (CA)
HASLETT JAMES W (CA)
SMALLWOOD ROBERT E (CA)
TROFIMENKOFF FREDERICK N (CA)

E21B17/00; E21B47/12; E21B47/01; F16L25/02; (IPC1-7): E21B17/00; E21B47/01

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