Skip to Main Content
Book Chapter

Induced Fractures in Core

Published:
January 01, 1990

Abstract

Fractures induced in core are fractures that develop during drilling, coring, or subsequent handling. Such fracture scan be grouped into three distinct categories. Drillinginduced fractures propagate in the rock ahead of the bit during drilling. Because they may extend laterally beyond the column to be drilled they may be present in the borehole wall. Coring-induced fractures can develop anywhere within the core barrel. However, they generally form near the bit and before, or at, the scribe knives. Coring-induced fractures that form at specific locations within the barrel can possess distinctive characteristics. Handling-induced fractures form primarily during removal of the core from the core barrel, or during the plugging and slabbing process. Such fractures also may be induced when core is transported or when core lengths are sized to permit boxing for shipment and storage. Handling-induced fractures include desiccation cracks that may develop during core storage.

Drilling- and coring-induced fractures are initiated by the coupling of stress states related to drilling, burial, or insitu stresses within the undisturbed rock, as well as stress imbalances caused by removal of overburden pressure. Handling-induced fractures generally are attributed to stresses caused by three-point bending and impact. In all cases, development of induced fractures may also be influenced by preexisting mechanical anisotropies such as microfractures, natural fractures, faults, bedding planes, cross-bedding, solution cleavage, and residual stresses. In short, induced fractures can be attributed to unique stress states that may develop before, at, or behind the bit, at the scribe knives, within the core barrel, or

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Methods in Exploration

Fractured Core Analysis: Interpretation, Logging, and Use of Natural and Induced Fractures in Core

B. R. Kulander
B. R. Kulander
Department of Geological Sciences Wright State University Dayton, Ohio, U.S.A.
Search for other works by this author on:
S. L. Dean
S. L. Dean
Department of Geology University of Toledo Toledo, Ohio, U.S.A.
Search for other works by this author on:
B. J. Ward, Jr.
B. J. Ward, Jr.
Amoco Production Company Research Center Tulsa, Oklahoma, U.S.A.
1
Currently with Associated Fracture Consultants, Broken Arrow, Oklahoma, U.S.A.
Search for other works by this author on:
American Association of Petroleum Geologists
Volume
8
ISBN electronic:
9781629811260
Publication date:
January 01, 1990

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal