The advantages and economics that make CT attractive for drilling and remedial interventions also apply for well completions. For example, techniques for running an electrical submersible pump (ESP) on coiled tubing expand artifi cial- lift options for remote locations with limited rig availability, for areas with high workover costs and for offshore wells.
Artificial Lift A CT-deployed ESP lifts fluid through the coiled tubing or up the annulus around a coiled tubing string. Prior to being purchased by Schlumberger, CAMCO company REDA installed the first submergible pump on coiled tubing in 1992 and the fi rst coiled tubing ESP and power cable system in the UK in 1994. Today, REDACoil submergible pump technology installs and sup- ports the ESP power cable inside 2-in. or 23 coiled tubing (right).
⁄ 8 -in.
The self-supporting Friction Deployed sub- mergible pump power cable minimizes CT unit and installation costs. The cable is no longer banded to the coiled tubing during deployment at a wellsite, but remains protected in an inhib- ited fl uid. The coiled tubing can also be used as a hydraulic conduit for pressure actuation of packers, subsurface safety valves or other down- hole equipment. Controlling wells with kill-weight fl uids prior to an ESP installation is expensive and time- consuming, and often results in lower well pro- ductivity because of formation damage. The REDACoil system allows for quick, safe coiled tubing deployment into a well under pressure. Placing the power cable inside coiled tubing assures a secure seal within the BOP and stripper head during installation.
Recent advances in REDACoil technology, including internal power, data and fiber-optic cables, have made it possible to produce high
fl ow-rate wells at up to 20,000 B/D [3,180 m3/d] of fluid inside 7-in. casing. For well conditions that do not allow flow up the casing, placing a REDACoil system inside 7-in. production pipe isolates produced fl uids from both the 95 casing and the ESP power cable.
⁄ 8 -in. well
22. Dahroug A, Al-Marzooqi A, Al-Ansara F, Chareuf A and Hassan M, “ Selective Coiled-Tubing Access into Multilateral Wells in Upper Zakum Field: A Two-Well Case Study from Abu-Dhabi,” paper SPE 81716, presented at the SPE/IcoTA Coiled Tubing Conference, Houston, Texas, USA, April 8– 9, 2003.
23. Al Farsi N, Ojulari B, Hook P and Staal TW: “ A Combined Diagnosis and Treatment Service for Multilateral Injector Wells,” paper SPE 84403, presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA, October 5– 8, 2003.
> Arti cial-lift deployment. REDACoil CT-deployed electrical submersible pump (ESP) systems with internal power cables reduce installation expenses and production downtime associated with remote or high-cost wells and offshore platforms where space and rig availability are limited.
Friction Deployed power cable
Friction Deployed power cable
2 3⁄ 8-in. coiled tubing
CoilTOOLS connector REDA lower connector
Motors
Universal motor base (UMB) Protector
7-in. production tubing 9 5⁄ 8-in. casing
Special discharge head Pump
Shrouded intake
Protector with UMB 5.5-in. x 15-ft shrouded tube
2 3⁄ 8-in. coiled tubing
Fluted centralizer 7-in. retrievable packer
Spring 2004
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