THE IMPORTANCE OF GEOMECHANICAL EVALUATION OF DEVELOPMENT WELL TO SUPPORT WELL ECONOMY IN THE WEST MADURA OFFSHORE (WMO) FIELD, NORTHEAST JAVA BASIN, EAST JAVA
The WMO Field was discovered in January 2002 through the drilling of K-40-1 Well. This field is then developed through the drilling of seven development wells with recovered reserves of 3.36 MMSTB and 42 BSCF. In this study, an analysis was conducted on the P-40-A8 Well. This well was drilled o...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/79779 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The WMO Field was discovered in January 2002 through the drilling of K-40-1
Well. This field is then developed through the drilling of seven development wells
with recovered reserves of 3.36 MMSTB and 42 BSCF. In this study, an analysis
was conducted on the P-40-A8 Well. This well was drilled on January 20, 2022 with
a proposed cost of USD 13,870,625 and a planned Total Depth (TD) to a depth of
8668 ftMD (-5060 ft TVDSS) with a drilling duration of 61 days. However, the
actual drilling of P-40-A8 Well cost more and was longer than the plan, as much
as USD 25,303,398 and a TD realization of up to 9550 ftMD (-5248 ft TVDSS) with
a drilling duration of 150 days.
The increase in drilling costs and duration was caused by drilling operational
problems, especially related to drill hole stability. Borehole stability is controlled
by various factors including in-situ pressure, pore pressure, rock strength, direction
of the well drill and specific gravity of mud. In this research, geomechanics model
approach was carried out using reference data from surrounding wells. The data
used is well log data, Leak Off Test (LOT) pressure as validation data, and regional
stress data.
The results of this study suggest that there is a change in the stress regime of P-40-
A8 Well, from a normal fault to strike-slip. This change is observed from the onedimensional geomechanical model. This is expected to greatly contribute to
problems related to the borehole stability during the drilling of P-40-A8 Well, such
as stuck pipe due to shale collapse during drilling because the specific gravity of
mud used is less than the collapse pressure value, which has significantly increased
the cost and duration of the drilling. |
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