Summary Connection and total gas measurements were used qualitatively for decades in drilling oil... more Summary Connection and total gas measurements were used qualitatively for decades in drilling oil and gas wells to identify overbalanced, underbalanced, or near-underbalanced pressure conditions (mud hydrostatic pressure relative to shale pore pressure). Results often conflicted with directly measured sand pore pressures (PP) and the pre-existing perceptions of shale PP. We propose a technique that allows mud gases to be used in a quantitative manner when (1) there is an increased understanding of the relationship between mud gases and shale PP, (2) the development of the logging-while-drilling (LWD) -based annular-pressure measurement allows for the real-time monitoring of downhole hydrostatic pressures, and (3) differences between sand and shale PP may exist as a result of the sand's structural position. This paper presents time-based equivalent-circulating-density (ECD) behavior relative to block movement, flow rate, and total gas from Gulf of Mexico (GOM) wells, and explains...
Connection and total gas measurements have been used qualitatively for decades in drilling oil an... more Connection and total gas measurements have been used qualitatively for decades in drilling oil and gas wells to identify over-balanced, under-balanced or near-under-balanced pressure conditions (mud hydrostatic relative to shale pore pressure). Results often conflicted with sand direct measured pore pressures and the pre-existing perceptions of shale pore pressure. We propose a technique that allows mud gases to be used in a quantitative manner, given that: (1) there is an increased understanding of the relationship between mud gases and shale pore pressure, (2) the development of the LWD based annular pressure measurement allows real-time monitoring of down hole hydrostatic pressures, and (3) differences between sand and shale pore pressure may exist as a result of the sand's structural position. This paper presents time-based ECD behavior of block movement, flow rate, and total gas from Gulf of Mexico wells, and explains the relationship to shale pore pressure. These examples ...
Summary Connection and total gas measurements were used qualitatively for decades in drilling oil... more Summary Connection and total gas measurements were used qualitatively for decades in drilling oil and gas wells to identify overbalanced, underbalanced, or near-underbalanced pressure conditions (mud hydrostatic pressure relative to shale pore pressure). Results often conflicted with directly measured sand pore pressures (PP) and the pre-existing perceptions of shale PP. We propose a technique that allows mud gases to be used in a quantitative manner when (1) there is an increased understanding of the relationship between mud gases and shale PP, (2) the development of the logging-while-drilling (LWD) -based annular-pressure measurement allows for the real-time monitoring of downhole hydrostatic pressures, and (3) differences between sand and shale PP may exist as a result of the sand's structural position. This paper presents time-based equivalent-circulating-density (ECD) behavior relative to block movement, flow rate, and total gas from Gulf of Mexico (GOM) wells, and explains...
Connection and total gas measurements have been used qualitatively for decades in drilling oil an... more Connection and total gas measurements have been used qualitatively for decades in drilling oil and gas wells to identify over-balanced, under-balanced or near-under-balanced pressure conditions (mud hydrostatic relative to shale pore pressure). Results often conflicted with sand direct measured pore pressures and the pre-existing perceptions of shale pore pressure. We propose a technique that allows mud gases to be used in a quantitative manner, given that: (1) there is an increased understanding of the relationship between mud gases and shale pore pressure, (2) the development of the LWD based annular pressure measurement allows real-time monitoring of down hole hydrostatic pressures, and (3) differences between sand and shale pore pressure may exist as a result of the sand's structural position. This paper presents time-based ECD behavior of block movement, flow rate, and total gas from Gulf of Mexico wells, and explains the relationship to shale pore pressure. These examples ...
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