Novel Technology of Concentric Coiled Tubing Enhances Ultra-Low Pressure Reservoir Wellbore Cleanouts in Kuwait
- Mohammed Ahmad AlMatar (Kuwait Oil Company) | Faisal Shayea Alshammari (Baker Hughes, GE) | Naser Bader Alhouti (Kuwait Foreign Petroleum Exploration Co)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 12-15 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- Heavy oil, Kuwait, South ratqa, Sand cleanout, Concentric Coiled tubing
- 4 in the last 30 days
- 72 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 5.00|
|SPE Non-Member Price:||USD 28.00|
Wells in the South Ratqa field often fill with sand. Ultra low bottom-hole pressure did not allow efficient sand cleanouts in several wells. Despite using massive amounts of nitrogen during clean out, and largest available CT size (2.375") to ensure enough annular velocity; severe fluid losses occurred into the formation, which resulted in decreased well production post clean outs, moreover handling energized returns has always been a logistic and safety hazard
Recently, concentric coiled tubing (CCT) technology was employed for the first time in Kuwait and five wells were identified as viable fill cleanout candidates for which traditional cleanout methods had proved inefficient at best and many times unsuccessful. The system uses concentric coiled tubing and a special vacuum tool designed to apply a localized drawdown, which would deliver the sand particles through the Coiled Tubing / Coiled tubing annulus to surface. Returns were handled using H2S resistant lines into a desander.
A carefully engineered cleanout program enabled removal of more than 12 MT of sand from four vertical wells, and also identified the formation damage in a horizontal wellbore. The identification of wellbore damage revealed the best intervention to cure the damage and eliminated speculative remedies that sometimes increased the damage done to reservoir. Additionally, the layout of well plots was designed in a very congested way to maximize output but made it impractical to have return pits, requiring mobile tanks to handle returns, while the energized nature of returns in conventional nitrogen jobs are dangerous to handle in a closed tank environment. CCT eliminated that hazard as the returns are not energized.
The campaign has pushed the boundaries of the coiled tubing interventions in Kuwait and has unlocked several wellbore cleanout opportunities using the CCT technology
|File Size||753 KB||Number of Pages||8|
Li. J., A. Crabtree, M. Kutchel, J. Diaz, BJ Services company, W. Reyes, R. Dugarte, L. Pena, PDVSA. 2008 SPE 115303 Sand/Well Vacuuming Technology with Concentric Coiled Tubing: Best Practices and Lessons learned from over 600 Operations. Prepared for presentation at the SPE Asia Pacific Oil and Gas Conference and Exhibition, Perth, Australia, 20 – 22 October 2008.
I. Benzaquen, J. Romero, J. Zambrano, P. Henao, and A. Ortiz, Petroleos de Venezuela S.A. 2006 SPE 102436 – Cleaning effectivity of Concentric Coiled Tubing in Horizontal wells, Cerro Negro Area, Carabobo Field, Venezuela. Prepared for presentation at the 2006 SPE international Oil and Gas Conference and Exhibition in China held in Beijing, China, 5 – 7 December 2006
Phil Rafferty, BJ Services Company; Jim Ennis, SPE, ConocoPhillips Alaska Inc.; and Jason Skufca, SPE and Steven Craig, SPE, BJ Services Company. 2007 SPE 107010 Enhanced Solids Removal Techniques from Ultra Low Pressure Wells Using Concentric Coiled Tubing Vacuum Technology. Prepared for presentation at the 2007 SPE/ICoTA coiled tubing and well intervention conference and Exhibition held in the Woodlands, Texas, USA, 20 – 21 March 2007.
M. Ababou, Baker Hughes Oman, R. Al Mujaini, C. Velazco Quesada, W. Afify Taha, Petroleum Development Oman. 2012 SPE 161819. Concentric Coiled Tubing Helps Solve Challenging Acid Flow Back in High H2S Content Well. Prepared for presentation at the Abu Dhabi International Petroleum Exhibition and Conference held in Abu Dhabi, UAE, 11 – 14 November 2012.
J. Skufca and J. Li, BJ Services Company. 2009 SPE 121498 Cleaning Large Dimeter Proppant in Low Bottom Hole Pressure, Extended Reach wells with Concentric Coiled Tubing Vacuuming Technology. Prepared for presentation at the 2009 SPE / ICoTA Coiled Tubing and Well Intervention Conference and Exhibition held in the Woodlands, Texas, USA, March 31st – April 1st 2009.