ANALISYS OF OVERPRESSURE CHARACTERISTICS IN VEN FIELD, SOUTH SUMATRA BASIN
Ven Field is an oil and gas field in the South Sumatra Basin. The Ven Field is divided into four formations: the Gumai Formation, the Air Benakat Formation, the Muara Enim Formation, and the Kasai Formation. During drilling operations, several challenges were encountered, such as background ga...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/79348 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Ven Field is an oil and gas field in the South Sumatra Basin. The Ven Field is
divided into four formations: the Gumai Formation, the Air Benakat Formation, the
Muara Enim Formation, and the Kasai Formation. During drilling operations,
several challenges were encountered, such as background gas and kick. The
occurrence of these drilling problems may indicate the presence of overpressure
zones. Poorly studied overpressure can lead to significant financial and technical
losses during drilling operations.
The objective of this research is to estimate pore pressure values in each drilling
well using wireline log data, determine the depth of the first occurrence of
overpressure in each drilling well, identify the mechanisms causing overpressure
in each drilling well, and analyze the relationship between the occurrence of
overpressure zones in each drilling well and tectonic and stratigraphic events in
the research area. Data processing was performed on three wells using wireline
log data, mud pressure data, direct pressure test data, temperature data, and
drilling reports. The conditions of the research area were used as a reference to
estimate pore pressure.
Based on the analysis, it was found that all three wells encounter overpressure
zones. The overpressure zones occur at depths ranging from 1200 to 1240 meters.
The analysis indicates that the three wells have both hydrostatic pressure and
overpressure conditions. The mechanism of overpressure formation is influenced
by loading mechanisms with the estimated pore pressure gradient of 0.44 psi/ft to
0.83 psi/ft. The loading mechanism is caused by high sedimentation rates in the
Gumai Formation due to uplift of the Barisan Mountains. The lateral drainage
phenomenon occurs due to the presence of sandy layers between the claystone
layers, supported by the occurrence of Intra-Gumai Formation in the research area
caused by progradation events. |
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