Geothermal Well Behaviour Prediction After Air Compress Stimulation Using One-Dimensional Transient Numerical Modelling

Authors: Windra Yusman, Sparisoma Viridi, Sudjati Rachmat

The non-discharges geothermal wells have been a main problem in geothermal development process and well discharge stimulation is required to initiate a flow. Air compress stimulation is one of the methods to trigger a fluid flow from geothermal reservoir. The result of this process can be predicted by using by Af/Ac method [3] but sometimes this method show uncertainty result in several geothermal wells and does not take into account the time required for the process. This paper presents a simulation model of non-discharges well under air compress stimulation to predict well behavior and time process required. The component of this model consists of geothermal well data during heating-up process such as pressure, temperature and mass flow in water column and main feed zone level (based on several geothermal wells). One-dimensional transient numerical model is run in the Single Fluid Volume Element (SFVE) simulator [4] and the input data is read in to model. Based on simulation result, the geothermal well behavior prediction after air compress stimulation will be valid under two specific circumstance such as single phase fluid density between 1 – 28 kg/m3 and above 28.5 kg/m3. The first condition shows that successful well discharge and the last condition represent failed well discharge after air compress stimulation (only for two wells data). Discharge time is about 80 s or less, which is too short compared to a couple hours as observed field data. This models need to improve by updating more geothermal well data and modified fluid phase condition inside the wellbore.

Comments: Pages. IOP Conference Series: Earth and Environmental Science 29 (1), 012008 (2016); DOI: 10.1088/1755-1315/29/1/012008

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Submission history

[v1] 2015-04-26 04:42:39
[v2] 2015-07-16 10:17:00

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