Concentric Coiled Tubing Technology for Well Cleaning and Evaluation in Complex Horizontal Wells: A 3 Wells Case Study from Heavy Oil Field, Kuwait
- Nikita Kothari (Baker Hughes, a GE Company) | Mounir Ababou (Baker Hughes, a GE Company) | Srinivas Rao (Kuwait Oil Company) | Jose Gregorio Garcia (Kuwait Oil Company)
- Document ID
- Society of Petroleum Engineers
- SPE/ICoTA Well Intervention Conference and Exhibition, 26-27 March, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 3.1 Artificial Lift Systems, 3 Production and Well Operations, 2.1.3 Completion Equipment, 3.5 Well Intervention, 1.8 Formation Damage, 3.1.3 Hydraulic and Jet Pumps, 3 Production and Well Operations
- concentric coiled tubing, kuwait, horizontal wells, heavy oil
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- 116 since 2007
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A few horizontal wells were drilled in Kuwait, heavy oil field, as a part of cold production testing. Various workover interventions were performed on these wells. However, some of the wells showed sharp production decline and were producing below expectations. It was suspected that formation damage may have occurred in these ultra-low reservoir pressure wellbores due to the overbalance of the fluids used during interventions.
Concentric coiled tubing (CCT) technology comprising of a downhole jet pump, was recently employed for the first time in Kuwait and was determined to be an effective method to clean the horizontal sections and investigate the reasons for the production problems. The single phase cleanout fluid is circulated down the inner string to power the jet pump, creating a localized drawdown that vacuums the formation solids or fluids out of the wellbore and the combined sand/fluid stream returns via the CCT annulus. The multiple operating modes provided the benefit of cleaning and treating the wellbore in the same run.
This specialized system was successfully utilized to remove sand, evaluate the formation damage and enhance production; meeting all objectives in a single well intervention. Pressure and temperature gauges run below the tool on two wells recorded bottomhole pressure of only 150 psi. Post-production results has pushed the boundaries of the well interventions in heavy oil field in Kuwait and has unlocked several wellbore cleanout and formation damage evaluation opportunities using the CCT technology.
This paper reviews the benefits of the concentric coiled tubing technology and provides a comprehensive case study of the first three horizontal wells. The analysis of the sand and fluid influx profiles obtained during the vacuuming process assisted in to evaluating well production provided crucial data in formulating a management strategy.
|File Size||1 MB||Number of Pages||16|
S. Rao, J. Garcia, A. Al-Bahri, M Al-Faudari, A. Al-Naqi: Concentric Coiled Tubing technology for Well Cleaning & Evaluation in Shallow Horizontal Wells: A Case Study from Heavy Oil Filed Kuwait, SPE 193782 presented at the 2018 SPE International Heavy Oil Conference and Exhibition, 10-12 December 2018, Kuwait.
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Rodolfo Pineda, B.J. Lindsey, Michael Taggart, Simon Smith, Mounir Ababou: A Chronological Review of Concentric Coiled Tubing Vacuum Technology: Past, Present and Future, SPE 163937 presented at the SPE/ICoTA Coiled Tubing & Well Intervention Conference & Exhibition held in The Woodlands, Texas, USA, 26-27 March 2013.
Li, J.,A. Crabtree, M. Kutchel, J. Diaz, W. Reyes, R. Dugarte, L. Peña: Sand/Well Vacuuming Technology with Concentric Coiled Tubing : Best Practices and Lessons Learned from Over 600 Operations" paper SPE-116673-MS presented at SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 20-22 October, 2008