> Aerial view of coiled tubing drilling and completion operations in the Sajaa gas eld of the United Arab Emirates.
REDACoil technology has a proven record with more than 20 installations worldwide. Anadarko Petroleum has installed 12 REDACoil completions in Qatar.24
These systems were
bottom-intake configurations with annular production. These wells have 95
⁄ 8
about 4,000 ft [1,219 m] TVD with 4,000 to 6,300 ft [1,920 m] MD. The maximum well incli- nation at pump depth is 86° . The current REDACoil confi guration consists ⁄ 8
of 23 -in. casing at
-in. coiled tubing with internal power cable, a REDA lower connector, motors, universal motor base, protector, discharge head, pumps, intake and thrust protector. The 150-ft [46-m] BHA is installed inside a 7-in. liner. Fluid production ranges from 8,000 to 12,000 B/D [1,272 to 1,907 m3/d] with only about 100 Mcf/D [2,864 m3/d] of gas. The BHT is 155° F [68° C]. The lower completion contains a deep-set down- hole safety valve, sliding sleeve, permanent pressure and temperature gauges and chemical- injection mandrels.
On other REDACoil installations a mechani- cally activated FIV Formation Isolation Valve device may also be included. This ball-type valve is actuated by a stinger at the bottom of the REDACoil assembly to allow underbalanced deployment of the ESP. It is also possible to add a Phoenix MultiSensor system for continuous downhole data-gathering. This sensor monitors pump and well parameters and transmits data through the power cable.
56
Offshore, CT expands ESP applications when through-tubing installation is feasible, eliminat- ing the need for conventional rig workovers and minimizing downtime as well as deferred produc- tion. This unique, flexible technique has potential in small or marginal offshore fields where no gas-lift infrastructure exists or where conversion from gas lift to ESP is required. In the South China Sea Magpie field of Southeast Asia, Shell Brunei installed two off- shore REDACoil completions similar to those in Qatar except for using 2-in. instead of 23 coiled tubing.25
⁄ 8 -in. The well depth is 3,400 to
3,800 ft [1,036 to 1,158 m] with well inclinations of 60 to 65° . REDACoil equipment is the same as that used in Qatar, but the pumps have lower fl uid-volume output.
Shell selected the REDACoil system to meet
workover cost objectives when converting from gas lift to ESP as the field matured. Combined with technologies like an advanced gas handler and additional mechanical barriers, the REDACoil system reduced costs and increased oil production in two wells. Production from the first REDACoil installation, Magpie Well 14, increased to 2,201 B/D [350 m3/d], 56% more than the gas-lift design of 1,415 B/D [225 m3/d]. In the second well, ESP production increased to 4,560 B/D [725 m3/d], 32% more than the 3,459 B/D [550 m3/d] with a gas-lift design. Shell estimates that converting from gas lift to ESP will recover an incremental 3.4 million bbl
[540,000 m3] of oil from the fi rst well and 2 mil- lion bbl [318,000 m3] from the second. The REDACoil system in Magpie Well 14 continues to operate after more than 41
⁄ 2 years. 24. Penny RC, Patterson JC, Stamey RC and Dwiggins JL:
“ Coiled Tubing and ESP Technology Improve Field Evaluation Cost,” paper SPE 38332, presented at the SPE Western Regional Meeting, Long Beach, California, USA, June 25– 27, 1997.
Patterson JC, Pursell JC and McHugh MD: “ A Coiled Tubing Deployed Electric Submersible Pumping System Enhance Field Development Costs,” presented at the SPE ESP Workshop, Houston, Texas, USA, April 26– 28, 2000.
25. Pastor G, Knoppe R and Shepler R: “ South China Sea Gas Lifted Oil Well Conversion Utilizing Coil Tubing Electric Submersible Pumping Systems,” presented at the SPE ESP Workshop, Houston, Texas, USA, April 28– 30, 1999.
26. Lode JE, Mø ller RE, Nesvik KT, Buchanan A and Myklebust J: “ Further Developments for Coiled Tubing Floater Operations,” paper SPE 89623, presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, USA, March 23– 24, 2004.
Leising LJ, Ali AM, Young JR and Arciniegas OE:
“ Re-Enterable Through-Tubing Gravel-Pack System,” paper SPE 89524, presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, USA, March 23– 24, 2004.
27. Barclay C, Pellenbarg J, Tettero F, Pfeiffer J, Slater H, Staal T, Stiles D, Tilling G and Whitney C: “ The Beginning of the End: A Review of Abandonment and Decommis- sioning Practices,” Oil eld Rev iew 13, no. 4 (Winter 2001/2002): 28– 41.
28. Barclay IS, Johnson CR, Staal TW, Choudhary S and Al-Hamandani A: “ Utilizing Innovative Flexible Sealant Technology in Rigless Plug and Abandonment,” paper SPE 89622, presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, USA, March 23– 24, 2004.
29. Tettero F, Barclay I and Staal T: “ Optimizing Integrated Rigless Plug and Abandonment — A 60 Well Case Study,” paper SPE 89636, presented at the SPE/ICoTA Coiled Tubing Conference and Exhibition, Houston, Texas, USA, March 23– 24, 2004.
Oilfi eld Review
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