Abstract

Temperature wellbore studies are widely applied for well testing and logging at the stages of exploration and development. However, in nowadays practice the interpretation is still done mainly qualitatively. In last few years different approaches to joint interpretation of temperature along with pressure and flow rates are discussed more and more widely. In particular, there is a special interest in determination of flow profile and individual properties of near-wellbore zone of perforated wells in multi-layer reservoirs from analysis of transient temperature and pressure during different transitional regimes.

In this work an application of mathematical modeling to quantitative interpretation of field temperature data from multi-layer wells is discussed.

For assessing flow rates and hydrodynamic parameter of individual layers of a multi-layer well, different approaches to inverse problem solution are analyzed. It is pointed out that for reaching higher reliability it is necessary to use for interpretation all available field data, including unsteady temperature logging data. Reasons of disagreement between field and simulation data are discussed.

The analysis of uncertainties arising in interpreting data from deviated wells is presented that indicates necessity to apply additional methods of analysis. It is shown that making use of supplementary simulations allows reaching better agreement between field and simulation data.

Therefore, the complex approach to interpretation of thermal logging data comprising application of sophisticated numerical temperature simulators to interpretation of the full available field data set of temperature logs and fixed-depth measurements accompanied by uncertainty analysis allows, on the one hand, to increase reliability of qualitative interpretation results and, on the other, to provide quantitative analysis of flow profiles and hydrodynamic properties of multi-layer well.

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