Abstract
The background for initiating the research reported herein, was the limited availability of material characteristics for shales encountered when drilling for oil and gas. Even fewer results are available where in-situ seal-peal shale samples have been tested, and very few have reported results where these in-situ materials have been exposed to different mud filtrates and temperatures. The work reported herein increases the knowledge of shale behavior and shows how this behavior changes with changing downhole conditions. Seal-peal samples from three different wells in the Norwegian sector of the North Sea were tested in this work. Consolidated undrained (CU) triaxial compression tests were carried out on the aged plugs and compared to CU-tests on cylindrical specimens that had not been aged (denoted reference tests). The reference tests were carried out to determine the failure characteristics of the ``undisturbed`` (non-aged) material. From the triaxial (CU) tests, the elastic and elasto-plastic parameters for the different materials were interpreted. Using the finite element code ``Cesar``, and the parameters found from the triaxial tests, simulations of borehole behavior were carried out. For different situations of borehole pressure and mudcake efficiencies, it has been demonstrated how the behavior of the borehole wall changed with different ageing
More>>
Citation Formats
Remvik, F.
Aspects of shale behavior in the petroleum industry.
Norway: N. p.,
1993.
Web.
Remvik, F.
Aspects of shale behavior in the petroleum industry.
Norway.
Remvik, F.
1993.
"Aspects of shale behavior in the petroleum industry."
Norway.
@misc{etde_10142752,
title = {Aspects of shale behavior in the petroleum industry}
author = {Remvik, F}
abstractNote = {The background for initiating the research reported herein, was the limited availability of material characteristics for shales encountered when drilling for oil and gas. Even fewer results are available where in-situ seal-peal shale samples have been tested, and very few have reported results where these in-situ materials have been exposed to different mud filtrates and temperatures. The work reported herein increases the knowledge of shale behavior and shows how this behavior changes with changing downhole conditions. Seal-peal samples from three different wells in the Norwegian sector of the North Sea were tested in this work. Consolidated undrained (CU) triaxial compression tests were carried out on the aged plugs and compared to CU-tests on cylindrical specimens that had not been aged (denoted reference tests). The reference tests were carried out to determine the failure characteristics of the ``undisturbed`` (non-aged) material. From the triaxial (CU) tests, the elastic and elasto-plastic parameters for the different materials were interpreted. Using the finite element code ``Cesar``, and the parameters found from the triaxial tests, simulations of borehole behavior were carried out. For different situations of borehole pressure and mudcake efficiencies, it has been demonstrated how the behavior of the borehole wall changed with different ageing conditions. The simulations showed the importance of carefully designed mud systems to avoid borehole instabilities in shale formations. The simulations supported the results of the triaxial tests. 61 refs., 76 figs., 29 tabs.}
place = {Norway}
year = {1993}
month = {Jun}
}
title = {Aspects of shale behavior in the petroleum industry}
author = {Remvik, F}
abstractNote = {The background for initiating the research reported herein, was the limited availability of material characteristics for shales encountered when drilling for oil and gas. Even fewer results are available where in-situ seal-peal shale samples have been tested, and very few have reported results where these in-situ materials have been exposed to different mud filtrates and temperatures. The work reported herein increases the knowledge of shale behavior and shows how this behavior changes with changing downhole conditions. Seal-peal samples from three different wells in the Norwegian sector of the North Sea were tested in this work. Consolidated undrained (CU) triaxial compression tests were carried out on the aged plugs and compared to CU-tests on cylindrical specimens that had not been aged (denoted reference tests). The reference tests were carried out to determine the failure characteristics of the ``undisturbed`` (non-aged) material. From the triaxial (CU) tests, the elastic and elasto-plastic parameters for the different materials were interpreted. Using the finite element code ``Cesar``, and the parameters found from the triaxial tests, simulations of borehole behavior were carried out. For different situations of borehole pressure and mudcake efficiencies, it has been demonstrated how the behavior of the borehole wall changed with different ageing conditions. The simulations showed the importance of carefully designed mud systems to avoid borehole instabilities in shale formations. The simulations supported the results of the triaxial tests. 61 refs., 76 figs., 29 tabs.}
place = {Norway}
year = {1993}
month = {Jun}
}