Drilling is one of the most significant cost contributors in oil and gas or geothermal projects. Therefore, geothermal developers should plan thoroughly and adequately monitor the drilling cost to optimize the entire geothermal development cost. Many previous studies have argued that drilling teams can achieve cost optimization when the risk mitigation and optimization plan have been thoroughly formulated early in the planning phase and implemented carefully during the drilling operation. However, a drilling project is a very complex operation involving various services and activities, especially in the exploration phase. Those complexities make it impossible for the drilling engineers to address and devise mitigation plans for potential drilling problems single-handedly. Creating a proper drilling program requires excellent and intensive communication between personnel from various backgrounds and expertise. One tool commonly used in this communication and coordination process is Drill-Well-on-Paper (DWOP). DWOP is common in oil and gas drilling projects to identify potential drilling problems that may result in non-productive-time (NPT) and increase total drilling costs. However, its application in geothermal drilling in Indonesia still leaves much room for improvement, as some may treat DWOP as just another custom in the industry without fully realizing its importance. When used correctly, DWOP can serve as a solid communication media that connects the engineers creating the drilling program with the drilling personnel carrying out the operation on the field. The importance of DWOP becomes even higher when it is associated with the large number of geothermal projects in Indonesia, which are in the exploratory drilling stage. The lack of data and lessons learned in the exploration stage makes it essential for communication sessions such as the DWOP to be held properly. This paper summarizes the study of analyzing the DWOP practices conducted by drilling personnel in Indonesia. The research assesses the effectiveness of DWOP practices in a geothermal drilling project in Indonesia. Several aspects were evaluated, such as the participants' awareness of the DWOP's significance and objectives, the DWOP activity structure, the participants' composition, the facilitators' competency, and the end-product of the DWOP. The data gathering for the research was done through a literature study and, distributing questionnaires / interviewing geothermal drilling personnel in Indonesia. Finally, this study intends to obtain a preliminary mapping of DWOP effectiveness in Indonesia's current geothermal industry and identify best practices for conducting DWOP. The geothermal drilling community in Indonesia can use these best practices as a guideline for conducting future DWOP, which will lead to cost optimization in exploration drilling and the whole geothermal project.

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