Cement-Slurry Design To Prevent Destabilization of Hydrates in Deepwater Environment
- Krishna Ravi (Halliburton) | Benjamin Iverson (Halliburton) | Seth Moore (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2009
- Document Type
- Journal Paper
- 373 - 377
- 2009. Society of Petroleum Engineers
- 1.10 Drilling Equipment, 1.14.3 Cement Formulation (Chemistry, Properties), 3 Production and Well Operations, 1.14 Casing and Cementing, 2 Well Completion, 5.9.1 Gas Hydrates, 1.6 Drilling Operations, 4.3.1 Hydrates, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating
- cement slurry, de-stabilization, hydrates, deepwater , heat of hydration
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- 985 since 2007
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Hydrates present challenges to drilling, cementing, and producing in deepwater environments. If the hydrates are destabilized during well operations, gas or solids could rise to the surface and create problems. Therefore, there is a compelling need to prevent destabilization of hydrates from drilling to producing operations in the life of the well.
The volume of cement slurry in the surface casing is great because of the large annulus, and this slurry volume results in a great amount of heat generated during slurry hydration. Further, during production, hydrocarbons could increase the temperature of the surrounding formation. These factors could destabilize the hydrates.
Cement slurries are designed to lower the heat of hydration while meeting or exceeding the other properties needed for successful deepwater cementing. Heat of hydration is reduced by a factor of more than two when compared to the conventional cement-slurry design. The improved cement-slurry designs lower considerably the thermal conductivity of the set cement sheath.
Laboratory tests designed to measure and optimize the heat of hydration are discussed and field implementation of these slurries and results are presented. Results presented in this paper should help the industry construct and produce wells without destabilizing the hydrates, thus, promoting well safety and economics.
As the global demand for hydrocarbons increases, the industry is exploring for resources in challenging environments such as deeper waters and extremely high-pressure/high-temperature formations (Barcelos et al. 1994; Biezen and Ravi 1999). There are many challenges in the construction and production of deepwater wells (Ravi et al. 1999). One topic not discussed in any detail, at least in the open literature, is the challenge posed by the presence of hydrates. The current paper discusses solutions to the challenges posed by hydrates during cementing. However, the challenge posed by hydrates in deepwater environments cannot be analyzed in isolation from the other challenges.
|File Size||453 KB||Number of Pages||5|
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