Having successfully demonstrated prototype system viability in a test well, aproduction Cable-Deployed Pumping System (CDPS) is being readied for fieldtesting. This paper provides details of the structure and capabilities of COPS, which was jointly developed by several U.S. manufacturers with petroleumindustry support. The principal technical contributions in the deployment ofelectric submersible pumps made by this new system are:
A new composite CAPSR Cable designed to withstand the rigors ofdownhole service and capable of being spliced.
A new approach to cable handling using a modified reeled tubinginjector.
New downhole completion options existing technology and equipmentconventional and inverted pump configurations.
Employment of new downhole electrical penetration Methods readily adaptableto either pump configuration.
Longer service possibilities for inverted electric submersible pump (ESP)motors, due to continuous lubrication oil purge from the surface.
Deploying submersible pumps from electrical support cables has long beenrecognized as an opportunity for a more cost-effective alternative toconventional tubing deployment in many production situations1,2,3.Cable deployment combines the advantages of faster installation and retrievalwith smaller workover equipment. These features can be significant in manyapplications, such as:
Platforms: where it can eliminate the need to interrupt drillingoperations to service ESPs.
Remote Locations: where it is difficult to transport derricks tolocations causing long delays and lost production.
Subsea Completions: where deployment from service vessels combined withsubsea wet connectors now being developed12 promises to allow theuse of ESPs in these applications for the first time.
A unique high-strength CAPS Cable utilizing specialized materials has made itpossible to deploy ESPs using a modified, field-proven reeled tubing injector.A full scale cable-deployed pumping system has been successfully evaluated in atest well. Ongoing work has increased COPS versatility to include bothconventional and inverted ESP units8. In addition, several differentwellhead completion options are now available, and specific completionarrangements have been designed to meet a wide variety of productionrequirements.
Continuing development of this technology offers new opportunities forhigh-volume artificial lift applications to benefit from the many advantages of ESPs.
A schematic overview of a cable deployed pumping system using a conventional ESP pump and motor is shown in Figure 1. Basic system components include:
Service unit consisting of reeled tubing injector and hydraulically drivenpayoff reel
CAPS Cable with splice when required
Umbilical cable containing hydraulic lines
Electrical penetrator and connectors
Subsurface safety valves and casing packer.
Electrical Components Main Cable: As shown in Figure 3, the tension members of the CAPS Cableconsist of two steel wire ropes located on either side of the electrical cablecore with a combined tensile strength of 80,000 lbs. High strength "vertebrae"blocks shown in Figure 9 enclose. support and protect the electrical core in afl at configuration.