Well test analysis using pressure derivative for fractured reservoir | |
| Author | Vijak Khupviwat |
| Call Number | AIT Thesis no.GE-13-04 |
| Subject(s) | Oil fields--Vietnam Reservoirs--Vietnam Basements--Vietnam |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineeringwith Areaof Specialization in Geo-exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-13-04 |
| Abstract | Hydrocarbon field producing from the igneous rock reservoir can be found worldwide. For example, oil is produced from fractured granite basement in Bach Ho (White Tiger) oil field of Vietnam. Porosity and permeability in igneous rock reservoir is governed by fracture systems. Well test analysis is used to characterize reservoir properties (fracture permeability, skin factor, storage ratio of fracture system, and inter-porosity flow) which are needed for reservoir simulation, operation, production planning and management.Summary of hydrocarbon in and around igneous rock (Schutter, 2003) was reviewed and a GPS-based databased was constructed using ArcGIS Explorer. Distribution map and charts of reservoir lithology, volume of reserve, and depth to the igneous rock reservoir were created. Flow behavior of double porosity reservoir was studied by two parallel semi-log straight lines from pressure vs. time. In this study, pressure derivative analysis is used to characterize well testing data from double porosity reservoir. Pressure derivative analysis utilized the characteristic points to interpret well testing data. Three flow regimes were observed from well testing data, and namely the first radial flow, transition flow, and the second radial flow. During first and second radial flow pressure derivatives are constantly at 0.5. The transition flow is characterized by a down-dip in pressure derivative. However, wellbore storage effect can distort the flow behavior of first radial flow and transition flow by shifting the minimum of pressure derivative. The indicator of wellbore storage effect is the peak in the pressure derivative.Well testing data from two wells of RangDong (Break of the Day), BD-1 and BD-2 studied by Minh (2005) were restudied in this research. Semi-log and pressure derivative analysis were used to characterize well testing data. BD-1 well test curve showed parallel straight lines in semi-log plot, while BD-2 curve showed only single semi-log straight line. Pressure derivatives of both well showed the down-dip during transition flow. Results obtained from both methods were then compared with results of curve matching analysis by Minh (2005).From results of this study, the pressure derivative analysis was found to be usefulto analyzewell testing data from a double porosity reservoir. Further investigation on the relationship between reservoir parameters and characteristic point should be investigated for other fractured igneous rock reservoirs. |
| Year | 2014 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-13-04 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Pham, Huy Giao; |
| Examination Committee(s) | Noppadol Phien-wej;Pinan Dawkrajai; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2014 |