Title:

New Well Test Measurement Technique for Low Enthalpy Geothermal Wells

Authors:

Umran Serpen and Niyazi Aksoy

Key Words:

Well testing, low enthalpy, modern well test analysis

Geo Location:

Dikili-Kaynarca, Turkey

Conference:

Stanford Geothermal Workshop

Year:

2007

Session:

Reservoir Engineering

Language:

English

File Size:

288KB

View File:

Abstract:

A new well test was devised to utilize for testing the low enthalpy, non-artesian geothermal wells. The test is simple and easy to apply in newly completed wells. There is no need to run a pressure recording gauge into the well. Usually, injection tests are being conducted after the completion of geothermal wells during the heating-up period. Sometimes, transmissivity figures obtained by injection tests do not comply with the results of production tests (build-up and drawdown) for various reasons. The new method enables us to carry out a drawdown test just after the completion of geothermal wells. Only drawdown tests can be conducted by this method.

The application of this method is similar to air lifting or inducing of well to discharge. Production tubing is submerged into water column within the geothermal well to a pre-calculated depth and tubing head is connected to a compressor. The test starts with compressed air flowing through tubing and air lifting the water column in the annulus, and subsequently the well starts to discharge. During the test compressed air flow is held constant, tubing wellhead pressure is recorded by a sensitive manometer and well production rate is measured by a weir. As the well produce, water level in the wellbore starts to decline because of reservoir pressure drop in response to production.

Two drawdown tests were conducted in Dikili geothermal field of Turkey. Dikili geothermal field is situated on the Aegean cost of Turkey. Exploration efforts until now resulted in several shallow wells with temperatures ranging 90o C to 135oC. At natural state, 200 L/sec of geothermal fluid with temperatures of 85oC were outflowing, and all wells were artesian. In recent years, the field was extensively exploited for greenhouse heating and water table dropped. The geothermal field heats 300 decare of greenhouses.

The drawdown test in this field were conducted in two different wells with temperatures of 90oC and 105oC, and lasted 2 and 5 hours. They were analyzed by conventional and modern well test methods, and their results were reported.


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