Use of High-Strength Coiled Tubing in High-Pressure/High-Temperature Perforating Operations
- Karen Bybee (JPT Assistant Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- June 2011
- Document Type
- Journal Paper
- 59 - 61
- 2011. Society of Petroleum Engineers
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- 55 since 2007
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This article, written by Assistant Technology Editor Karen Bybee, contains highlights of paper SPE 143079, "Use of High-Strength Coiled Tubing in High- Pressure/High-Temperature Perforating Operations," by K. Makris, SPE, and D.A. Barclay, Halliburton, and W.D. VanArnam, NOV-Quality Tubing, originally prepared for the 2011 SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, 5-6 April. The paper has not been peer reviewed.
A major operating company demonstrated interest in the development of high-strength (greater than 125,000-psi yield) coiled tubing (HS CT) for use in high-pressure/high-temperature (HP/HT) fields in the central North Sea. The objective of the operator was to perforate underbalanced with CT using as much as 1,700 ft of guns in one run. The CT had to be sufficiently strong to avoid collapsing while pulling the weight of the bottomhole assembly (BHA) and the string from the working depth.
During last 2 decades, more unconventional reservoirs have been targeted, such as those in HP/HT fields. An HP/HT field typically has bottomhole pressure (BHP) greater than 10,000 psi and a bottomhole temperature greater than 300°F.The reasons for targeting these fields includes the high yield of hydrocarbons they offer, which justifies the high drilling and completion costs, and the depletion of the more-conventional reservoirs in areas with well-established oilfield-support services, meaning that this already-established network can offset the increased well costs.
The range of well services used in HP/HT fields includes the provision of CT services, which have proved to offer a popular way to perform certain operations in these fields, such as deploying tubing-conveyed-perforating (TCP) guns. Often, the weight of the BHA and/or the wellhead pressure after perforating prohibits running perforating guns on wireline. On the other hand, using the rig blocks to deploy, run in hole, and reverse deploy the guns can be time consuming and costly. Hence, CT often can provide a carrier solution and perform such a task faster than the rig because it is stronger and has increased potential for wellbore access when compared to wireline. However, CT is limited by the weight it can pull and the differential pressure (CT annulus vs. CT pumping pressure) it can sustain. Exceeding these limits can result in a CT failure and result in a costly and time-consuming fishing job, or even a well-control situation. While more HP/HT fields are being developed, operators are considering the use of CT to perforate deeper wells with higher wellhead pressures. For the well-intervention industry to rise to the task, the need for stronger CT is obvious.
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