Application of Underbalanced Drilling Using the Guo-Ghalambor Method Approach in Lahendong Geothermal Field, Sulawesi Utara

Abstract

Sometimes a drilling operation in a geothermal field needs to be evaluated for the purpose of oprimizing the drilling itself. Therefore, it is necessary to carry out qualitative calculations to analyze whether the drilling operation is running optimally or not. The aim of using aerated drilling is to reduce zones with low pressure in the formation which could potentially cause lost circulation. The main purpose of using this method is to lift the cutting towards the well’s surface. The parameters considered in aerated drilling include well bottom pressure, drill cutting removal and well geometry. So by using this data, Liquid-Gas Rate Window boundaries are formed which will later be used as a reference for determining the optimal gas flow rate for cutting removal. The Kick Off Point (KOP) starts at a depth

Sometimes a drilling operation in a geothermal field needs to be evaluated for the purpose of oprimizing the drilling itself. Therefore, it is necessary to carry out qualitative calculations to analyze whether the drilling operation is running optimally or not. The aim of using aerated drilling is to reduce zones with low pressure in the formation which could potentially cause lost circulation. The main purpose of using this method is to lift the cutting towards the well’s surface. The parameters considered in aerated drilling include well bottom pressure, drill cutting removal and well geometry. So by using this data, Liquid-Gas Rate Window boundaries are formed which will later be used as a reference for determining the optimal gas flow rate for cutting removal. The Kick Off Point (KOP) starts at a depth of 497 m-MD with a maximum inclination of 30° and a total depth of 1974 m-MD. The geothermal well has the following casing configuration: 30” casing, 20” casing. 13-3” casing, 10-” casing, 10-” liner dan 8-” liner.

of 497 m-MD with a maximum inclination of 30° and a total depth of 1974 m-MD. The geothermal well has the following casing configuration: 30” casing, 20” casing. 13-3” casing, 10-” casing, 10-” liner dan 8-” liner.