THE ANALYSIS OF WIRELINE FORMATION TESTER DATA TO OBTAIN RESERVOIR PERMEABILITY

• Main Author: PRAMUDIBYO (NIM: 22215019), BAGUS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/21377
• Institution: Institut Teknologi Bandung

Data permeability of a reservoir can be obtained by several methods, such as: core <br /> <br /> analysis, well log data, Drill Stem Test (DST), Wireline Formation Tester (WFT) <br /> <br /> or so-called mini-DST. Both the core and DST methods require considerable <br /> <br /> operating costs until they finally get permeability data. Such large costs result in <br /> <br /> the limitation of the use of core and DST methods in all reservoir zones present in <br /> <br /> a well. Another method for obtaining permeability data is mini-DST. Mini-DST is <br /> <br /> a well test method like DST, but the operating costs of mini-DST are much smaller, <br /> <br /> and the duration of tests from mini-DST is much shorter. Mini-DST does not use <br /> <br /> DST, but uses Wireline Formation Tester (WFT) with dual packer. <br /> <br /> By looking at build up pressure data during the data acqusition on WFT, build up <br /> <br /> pressure analysis can be done using pressure transient analysis (PTA) method in <br /> <br /> Ecrin software. If the permeability can be obtained by conventional WFT method <br /> <br /> using pressure transient analysis (PTA) method, the cost incurred to obtain the <br /> <br /> permeability data becomes smaller and the time required is also shorter than WFT <br /> <br /> which is generally used to perform mini-DST, ussualy by using dual packer. <br /> <br /> In the result of WFT data analysis, from WFT data can be obtained some <br /> <br /> permeability which are derived from some method. Those are permeability that <br /> <br /> derived from WFT mobility and permeability derived from PTA result. Compared <br /> <br /> with the permeability data that derived from well logs, the permeability data from <br /> <br /> the PTA results have a higher level of consistency and conformity than the <br /> <br /> permeability data of WFT mobility. Referring to the conformity of permeability <br /> <br /> results from PTA data of WFT data to permeability of well logs, conventional WFT <br /> <br /> can be an alternative to obtain permeability data in reservoir zones around the <br /> <br /> borehole with the most limited cost compared to other methods.