The Offshore Company

Welltech, Inc.

Frank Allan Bryant

Joseph R Roche

Lawrence F Angelo

John David McLain

Vance P Overton

Edward D Briggs, Jr

Float

This invention relates to apparatus for elevating a mobile workover rig to an elevated operating position proximate wellhead. It includes a portable platform arranged for positioning proximate the wellhead with the platform having a fixed generally horizontal upper surface portion for receiving and supporting the wheels of the rig thereon. It also includes ram means comprising two longitudinally aligned portions connected to the platform for forming an inclined ramp extending from the upper surface of the platform to the ground for moving the rig thereonto. It also includes means connected to the ramp means for raising at least one of the portions of the rig to an elevated generally horizontal position substantially the same height as the upper surface of the platform while wheels of the rig are supported thereon to thereby elevate and support the rig in the elevated operating position.

Apparatus for elevating a mobile rig

Subsea cable apparatus adapted to extend from a floating structure to a subsea wellhead apparatus or stack with a marine riser pipe extending from the floating structure to the subsea wellhead, such apparatus including a cable supported on the floating structure, by a multiple roller sheave with an integral load cell for measuring tension in the cable, a clamp on the riser pipe adapted to engage the cable to support it, the cable between the clamp and the floating structure forming a free catenary loop, means for engaging and disengaging said clamp on said cable, remote, diverless means for disconnecting said clamp from said riser pipe, a telescoping connection in the lower end of said cable to absorb the shock of landing control pod attached to the lower end of the cable on the pod receptacle on the subsea wellhead apparatus and to compensate for relative movement between the cable and the subsea wellhead stack, a pod connector on the lower end of the cable, a mating pod receptacle connector on the subsea wellhead apparatus, and means for latching the connectors in mated engagement. The method of handling the cable apparatus for installation includes the steps of lowering the cable and pod and landing the pod connector on the subsea wellhead pod female receptacle, latching the pod connector in landed position, inserting the cable in the clamp, lowering and securing the clamp to the marine riser pipe, setting the clamp slips, inserting the cable in a support shoe above the clamp, supporting the cable between the clamp shoe and the floating structure in a free catenary loop, and for recovery includes the steps of retrieving the support shoe, disengaging the clamp from the cable, remotely retrieving and removing the clamp, releasing the pod latch, and raising the cable, and pod to the floating structure.

Subsea cable apparatus and method of handling same

Growing community of inventors

Houston, TX, United States of America

Frank Allan Bryant