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Regeneration of Georgian Geothermal Fields

#G-1042


Modeling the Processes of Regeneration Georgian Geothermal Fields Using the Geothermal Circulation Systems

Tech Area / Field

  • NNE-GEN/Geothermal Energy/Non-Nuclear Energy
  • ENV-APC/Air Pollution and Control/Environment

Status
3 Approved without Funding

Registration date
21.06.2003

Leading Institute
Center for Coordination and Implementation of Scientific, Technological and Socio-Economic Projects, Georgia, Tbilisi

Supporting institutes

  • Caucasian Institute of Raw Materials (CIRM), Georgia, Tbilisi\nGeorgian Geophysical Society, Georgia, Tbilisi

Collaborators

  • El Cerrito Geothermal, USA, CA, El Cerrito\nGeothermex, Inc., USA, VA, Richmond

Project summary

Against the background of the world energy and ecology crisis, searches for the renewable sources of energy and their rational usage are of great importance. Among them, the Earth’s internal heat is of special importance.

It is worth noting that by 2000 the estimated heat power of the world geothermal fields was 16209 Mt, the annual production of geothermal energy amounted to 162 009 TJ/yr. while fluids flow made 64 416 kg/s. Over the last five years 1028 geothermal wells have been drilled.

The sphere of usage of geothermal waters is quite vast. They are used in thermal power industry, balneology, for sanitary and hygienic purposes, in generating electricity, in perfumery and for the mineral water production.

The explorations carried out in the 70’s showed that Georgia has been rich in geothermal resources and that their development will allow to save over a year 500 000 tons of conventional fuel and to reduce CO2 emission into the air by 1.22 megatons.

If we take into account that Georgia has no sufficient organic fuel resources of its own, it will be clear that the searches for the local renewable energy resources and their development are of top priority.

The goals of the project are: to avert the depletion of producing geothermal fields in Georgia and to prolong their life for a long time; to considerably reduce CO2 emission and to protect the atmosphere from the carbon dioxide pollution by substituting the traditional fuel for the geothermal one.

Up to the present, thermal waters in Georgia have been used as follows: well -> consumer -> sewerage. The changes of hydrodynamic and hydro-chemical parameters in the fields have not been monitored in time. This caused gradual reduction of wells’ flow and very often the fields stopped existing.

To preserve pressure in the water-bearing aquifer and to prolong the field’s life, the world practice has been pumping wastewater back underground (re-injection). Thereby, an artificial geothermal circulation system (GCS) is created.

To create GCS, it is necessary to know hydrodynamic parameters of the wells and aquifers. The project provides for calculations of parameters needed for creating GCS using mathematical modeling and for determining scientifically rational operation regime for geothermal fields in Georgia.

The project can be regarded as an applied research.

To perform the project’s objectives, three basic fields in two main thermal water-bearing horizons have been selected. The results of the studies of the hydrodynamic regime and the basic fields rational production will be used for the following projects of development of other fields of the same water-bearing horizons in Georgia.

Data obtained over the years at the three basic fields will be gathered, processed and summarized. Thereby a database will be created allowing analyzing the fields’ hydrodynamic evolution in time.

Test hardware and instrumentation will be set up on the basic fields for well tests and monitoring.

Monitoring and well tests will be conducted.

The three-dimensional computer-based models for the fields will be constructed. Hydrodynamic parameters and the boundary conditions of the basic fields will be determined using special programs.

After the re-injection modeling is completed, actual resources of the fields will be calculated and their optimum production regime will be determined.

On the basis of the obtained results, the schematic diagrams of usage of geothermal energy for the heating, hot water supply and air conditioning in the cities and towns will be constructed. The potentialities for generating electricity will be determined; and economic and ecological effect of the geothermal heating will be calculated.

The project meets the requirements of the International Science and Technology Center (ISTC). It will allow the main performers of the project, previously engaged in arms sphere to apply their knowledge and skills for developing geothermal energy industry; to contribute to the solution of the problem of global warming; to create prerequisites for development and extension of the sphere of usage of geothermal energy in Georgia. And also to contribute significantly to improvement of waste-less production; to advertise the technology of extraction of geothermal heat and the spheres of its application; and finally, it will contribute to attracting foreign investments.

The main performers of the project have skills and experience needed for hydrogeological, hydrodynamic, economic, ecological and power studies at the geothermal fields as well as for mathematical modeling. They succeeded in implementation of a series of projects in cooperation with international organizations such as USAID (1997-1998), the Eurasian Foundation (1998), UNDP/GEF (1999-2000), and the World Bank (2001).

The project is the continuation of the above-mentioned works.

It will allow to promote the existing and to establish new relations with foreign counterparts. The experience gained when working at the project will allow carrying out similar studies on other thermal water fields both in Georgia and in other countries.


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The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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