Extreme-Environment Cementing in the Schoonebeek Heavy-Oil Field
- Dennis Denney (JPT Senior Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 2012
- Document Type
- Journal Paper
- 129 - 131
- 2012. Society of Petroleum Engineers
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- 94 since 2007
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This article, written by Senior Technology Editor Dennis Denney, contains highlights of paper SPE 150022, "Contemporary Approach Coupled With Traditional Techniques Tackles Extreme Wellbore Environment in Schoonebeek Heavy-Oil Field," by Andrew Foster, Auke Pollema, Ian Petitt, SPE, and James Heathman, SPE, Shell, and Carl Johnson, SPE, and Rudy Schlepers, Schlumberger, prepared for the 2011 SPE Heavy Oil Conference and Exhibition, Kuwait City, Kuwait, 12-14 December. The paper has not been peer reviewed.
The Schoonebeek heavy-oil field was first developed by Nederlandse Aardolie Maatschappij B.V. in the late 1940s. Because of economics, it was abandoned in 1996. In 2008, the Schoonebeek Redevelopment Project, using a gravity-assisted-steamflood (GASF) design concept, was initiated with 73 wells (44 producers, 25 injectors, and four observation wells). A key design requirement was long-term integrity of the cement sheath over an expected 25- to 30-year field life span. Complicating this requirement was the need for systems to place lightweight cement because lost-circulation issues were expected in both hole sections, particularly in the mechanically weak Bentheim sandstone.
The Schoonebeek field was discovered in 1943 and was on production until 1996. During this period, 597 vertical and deviated wells were drilled. In 1995, two horizontal wells were drilled to test borehole stability while drilling horizontals and test sand production during the production phase. Core data in numerous vertical wells show that the reservoir is coarsening upward. The lower part of the reservoir has a lower permeability than the upper part of the reservoir. One-fourth of the original oil volume was produced over the approximately 50-year period (more than 250 million bbl). Approximately 120 million bbl is expected to be produced by use of the GASF technique. Planned plateau production is 3000 m3/d, with a steam-injection plateau of 8000 to 10 000 m3/d.
Cementing thermal wells, particularly cyclic-steam-injection wells, is one of the most crucial and challenging cementing operations. Maintaining well integrity and zonal isolation over time is critical to the economic success of a steam project. The fundamental purpose of primary-cementing operations is the provision of effective zonal isolation during the life of the well. As wells become more challenging, more demands are placed on the cement-slurry design, operational practices, and in-situ properties of the well annular sealant. Uniform competent cement sheaths can minimize buckling, collapse, parting, or elongation caused by thermal stress.
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