Disposal of Oily Cuttings by Downhole Periodic Fracturing Injections, Valhall, North Sea: Case Study and Modeling Concepts
| Autor: | D.C. Gardner, R.W. Veatch, Z.A. Moschovidis, G.V. Sund |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | SPE Drilling & Completion. 9:256-262 |
| ISSN: | 1930-0204 1064-6671 |
| Popis: | Summary This paper presents the results of a pilot study for the injection of cuttings at great depth [8,094 ft total vertical depth (TVD)] in Paleocene/Eocene shale by periodic fracturing injections in two wells in the Valhall field in the North Sea. Injection is necessary to meet environmental requirements (< 1 vol% of oil in the cuttings disposed in the sea) that went into effect Jan. 1,1993. Valhall is an Upper Cretaceous chalk oil reservoir ≈ 180 miles offshore southern Norway. Amoco operates the field for Amerada Hess Norge A/S, Elf Petroleum Norge A/S, and Enterprise Oil Norge Ltd. Simulations were performed with a new conceptual model for disposal of cuttings (called the "disposal domain"). The actual pressure response during cuttings injections supports the model predictions. The cuttings are contained within a limited region of the formation (the disposal domain) where a system of hydraulic fractures have been created. The same model then was used to estimate the capacity of the formation to contain cuttings without increasing the treating pressure (and the closure stress) beyond the capacity of the tubulars. |
| Databáze: | OpenAIRE |
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