Impact of Successive Squeezes on Treatment Lifetime and Well Productivity: Comparative Assessment of Viscosified and Nonviscosified Treatments
- Niall Fleming (StatoilHydro ASA) | Kari Ramstad (StatoilHydro ASA) | Sam Kidd (Scaled Solutions) | Laurien W. Hoeth (Scaled Solutions)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- February 2010
- Document Type
- Journal Paper
- 99 - 110
- 2010. Society of Petroleum Engineers
- 1.14 Casing and Cementing, 1.2.3 Rock properties, 5.2 Reservoir Fluid Dynamics, 2.2.2 Perforating, 1.8 Formation Damage, 5.6.5 Tracers, 5.2.1 Phase Behavior and PVT Measurements, 3 Production and Well Operations, 4.1.2 Separation and Treating, 5.5.3 Scaling Methods, 2.4.3 Sand/Solids Control, 2.4.5 Gravel pack design & evaluation, 1.6.9 Coring, Fishing, 4.3.4 Scale, 4.2.3 Materials and Corrosion
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Over the lifetime of a well, it is possible that several squeeze operations will be performed depending on scaling severity. Downhole squeeze operations have been performed for many years and generally have been an effective scale-management tool. However, the long-term impact that successive squeezing has on treatment lifetime and well productivity has received little attention. Fleming et al. (2008) detailed the results of a unique sequence of long-term corefloods that were designed to replicate five successive treatments on the kaolinite-rich, Middle Tarbert core from Oseberg Sør. Relatively few squeeze treatments have been performed on this field, and the coreflood results were upscaled to provide a potential prediction of the effects of long-term squeezing on treatment lifetime and on well productivity on Oseberg Sør. Furthermore, the laboratory results were cross-checked by a comparison with the Heidrun field that has been squeezed for many years. Heidrun is an analog of Oseberg Sør, with kaolinite-rich producing intervals and similar productivity issues related to kaolinite mobilization.
In recent years, viscosified squeeze treatments have become popular for improved inhibitor placement within horizontal wells and have been used on Heidrun and Norne. However, the long-term impact that such squeezing has on treatment lifetime and well productivity has not been examined until now. This paper will give details of an identical sequence of long-term corefloods in which the inhibitor was viscosified. All testing parameters have been kept identical between viscosified and nonviscosified treatments, including the core material and scale inhibitor. The impact on squeeze lifetimes will be demonstrated along with potential formation-damage mechanisms.
|File Size||1 MB||Number of Pages||12|
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