Coiled Tubing Operations from a Work Boat
- Long Nick (Brunei Shell Petroleum) | Retna Raj (Dowell Schlumberger Eastern Inc) | Surasak Srisa-ard (Dowell Schlumberger Eastern Inc) | Son Hoang Nguyen (Dowell Schlumberger Eastern Inc)
- Document ID
- Society of Petroleum Engineers
- SPE/ICoTA Coiled Tubing & Well Intervention Conference and Exhibition, 5-6 April, The Woodlands, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 4.5 Offshore Facilities and Subsea Systems, 3.2.4 Acidising, 2.2.2 Perforating, 5.2 Reservoir Fluid Dynamics, 3 Production and Well Operations, 1.7.5 Well Control, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 2.4.3 Sand/Solids Control, 4.1.2 Separation and Treating, 4.5.4 Mooring Systems
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Unless there is support provided by a workover rig or temporary fixed platform, coiled tubing (CT) intervention workover on a small offshore platform is not feasible. Usually, small offshore platforms have low deck load capacity and available deck space is insufficient for CT workover operations. To puzzle out the solution to this issue, CT operations from a vessel were discussed and subsequently developed more than a decade ago. In 2002, the technique was substantially refined and
improved to improve safety and reliability, which allows well intervention from the deck of a floating anchored vessel. This technique utilizes a system which provides emergency CT disconnect and effectively compensates wave motion. The system includes the CT slack-disconnect assembly, reel control cabin, CT stabbing system, platform support gooseneck and a Pan/Tilt/Zoom Closed Circuit video system. The combination of the mentioned equipment allows CT
intervention applications to be carried out with minimum equipment on the platform in a safe and secure manner. The system is not only the solution for CT intervention on small offshore platforms but it also saves the rig up/rig down time, therefore minimizing human exposure to equipment handling. The system features improve the overall operation safety and provide an opportunity to perform CT stimulation with large treatment fluid volumes. Fundamentally, this system now forms a key part within an integrated service solution which allows CT services, pumping services, e-line, slick-line and testing services to be performed in a single smooth operation.
In Brunei, this technique has now been taken to a new level. The preferred vessel is now a relatively small self-propelled work boat, similar to those used for rig supply, albeit one fitted with a suitable pedestal crane, capable of lifting an injector head and support frame. These work boats allow swift movement between platforms and reduced reliance on support vessels such as tugs, anchor handlers or supply boats.
This paper introduces the features and benefits of a CT system which is designed to work from the deck of an anchored work boat and briefly summarizes the success of CT intervention campaigns in Brunei since 2007.
As with any mature oil and gas fields, maintaining and improving oil and gas productions is considered part of production operations. Well intervention work such as wellbore cleanout, wellbore obstruction retrieval, adding perforation, matrix acidizing, and fracturing all play an important role in maintaining and improving production. Each year, Brunei Shell Petroleum (BSP) typically selects a minimum of more than 60 wells as candidates for CT intervention. These candidates are
usually distributed to over 30 different offshore platforms. In terms of operational time, the completion of this intervention objective normally requires continuous activity for 7 to 8 months.
|File Size||350 KB||Number of Pages||9|