This study is conducted in order to assess the efficiency of the acid operations for the enhancement of a geothermal reservoir. The study area is located in Kuyucak geothermal license owned by SDS Energy where two production wells, namely KS-1 (3232 m) and KS-2 (3614 m) were drilled. The area is located at the northern flank of the Büyük Menderes Graben. Generalized stratigraphical succession of the area from bottom to top is Menderes Massif, Neogene sediments and Quaternary deposits. The marble unit of the Menderes Massif is the reservoir rock throughout the Büyük Menderes Graben which is also the case for KS-1 and KS-2 wells drilled at Kuyucak geothermal area. At KS-1, following the well completion operations, dynamic P-T logging and water loss test has been conducted where at this stage no artesian flow was observed. The results of the water loss test were used to identify the section(s) to perform the acidizing operation. Two reservoir sections were identified and a one-stage acidizing operation using 38 tonnes of 26% HCl was performed at the section with higher temperature values. The operations were performed while drill rig is at the site, allowing high pumping rates. After the operation, artesian flow was observed and the well was left for production for a certain period of time. At this stage, dynamic P-T logs were taken and a build-up test was performed. However, in order to further enhance the well, an additional acid operation was performed at the same reservoir using 39 tonnes of 20% HCl. In order the assess the performance of the acid operation another build-up test was performed. The analysis of the pressure transient curves indicated that the acid operation was successful which was further supported by the enhanced productivity index values. For KS-2 well, a similar operation schedule was employed. However, instead of performing two separate acidizing operations, a two stage acidizing operation with 37 tonnes of 20% HCl and 30 tonnes of 20% HCl was performed at different depths at the same reservoir. As a result of these two different operation schedules at these two wells penetrating the same reservoir, effect of acidizing operation on the enhancement of the reservoir was assessed.

Press the Back button in your browser, or search again.

Copyright 2017, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.