Workpackages 2 - Research

WP 2.03: Advanced geothermal drilling

Objectives of WP 2.03 was to improve data logging en monitoring system for drilling rigs to:

  • Improving success rate of drillings;
  • Decreasing drilling time;
  • Decreasing needed experts: scarcity of experts in Indonesia.

Slim holes

Slim holes can supply industrial users with sustainable heat.

  • In case of hot water production for single industrial users, a payback period is estimated at 8 years. The investement required is estimated at 6 M$.
  • Compared to standard (large scale) geothermal wells, small projects using slim holes will be much easier to realize, due to
    • much lower investments
    • small projects are easier to organize (only one user/heat-consumer required)
    • Due to a better match with the local demands, it fits for purpose and therefore it can be used more widely
    • The impact of several risks are limited
    • Space requirements are limited

Indonesia has large geothermal potential. This potential can be used for direct heating purposes for efficient and sustainable heating purposes in industry. Due to the limited size, slim holes can be used for a large range of industrial single users, making stakeholder management much easier compared to standard (large) geothermal projects. Once realized, a first project can set an example for more slim hole projects, or for a more large scale projects were multiple users combine their efforts. To initiate this opportunity, the following steps are suggested:

  • Find a launching customer. Focus on the industrial estates within a sedimentary basin, such as Jababeka industrial Estate or Karawang International Industrial City.
  • Determine, together with the industrial client, possible integration concepts.
  • Update the analyses, using one or multiple integration options.
  • In case of a positive business case, many more steps will be required. These next steps can be worked in more detail once a customer is involved, but will at least consist of getting required permits, environmental impact analyses, perform a more detailed geological study, update integration options and business case and organizing financing. Also, additional exploration may be required.  

In the major cities a lot of big buildings (offices, hospitals, etc.) are present. All these buildings have a cooling demand. With absorption cooling, thermal heat can be converted in cooling energy. This method is a proven technology as a sustainable alternative for building air conditioning systems. The energy demand (cooling) is estimated between 1 – 2 MW thermal energy. The required temperatures vary between 100 – 150 °C. Therefore absorption cooling could be an interesting case to work out in future for the slimhole drilling concept in sedimentary basins.

More information on this work package can be found in the GEOCAP Handbook