Integrated Analysis of Pressure Drawdown and Buildup Test Data

• Main Authors: Ching-HsienLiu, 劉謦賢
• Other Authors: Bieng-Zih Hsieh
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/38259988966458177827

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 101 === The general method in well-testing analysis is to separately analyze the pressure drawdown and buildup data; it is rare to combine the pressure drawdown and buildup data for analysis. We developed an improved and integrated method of analyzing pressure drawdown and buildup data; it includes a theoretically derived equation for semi-log plot analysis as well as type-curve analysis. We first established and then confirmed a numerical model of a reservoir, before drawing the type-curves of integrated pressure drawdown and buildup. The numerical model was used to simulate field data that contained pressure and flow-rate data. The conclusions from this study were that (1) the theoretically derived equation of integrated pressure drawdown and buildup, which is the same as the equation of the unified semi-log plot analysis in literatures, can be used for integrated semi-log plot analysis of pressure drawdown and buildup; (2) the type-curves of integrated pressure drawdown and buildup were developed and their applications were also described; (3) semi-log plot analysis and type-curves analysis of integrated pressure drawdown and buildup can be used when analyzing a constant or variable flow-rate well; (4) in a variable flow-rate well, the results’ accuracy of the integrated semi-log plot analysis correspond almost exactly to the results of traditional semi-log plot analysis; (5) in a variable flow-rate well, the results of a type-curve analysis of integrated pressure drawdown and buildup were more accurate than other methods, no matter what surface or sandface flow-rate data the analysis used; (6) integrating the pressure drawdown and buildup data provides more useful information in a pressure test analysis. The integrated method improved the interpretation and the efficiency of analysis.