A New Methodology for Designing Instrumentation of Production Wells for Inflow Profile Estimation
- G. Nævdal (RF-Rogaland Research) | E. Vefring (RF-Rogaland Research) | A. Berg (RF-Rogaland Research) | T. Mannseth (RF-Rogaland Research) | J.E. Nordtvedt (RF-Rogaland Research)
- Document ID
- Society of Petroleum Engineers
- SPE/DOE Improved Oil Recovery Symposium, 3-5 April, Tulsa, Oklahoma
- Publication Date
- Document Type
- Conference Paper
- 2000. Society of Petroleum Engineers
- 4.2 Pipelines, Flowlines and Risers, 5.5 Reservoir Simulation, 5.1 Reservoir Characterisation
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A new methodology for designing the instrumentation of production wells is presented. Using a well flow simulator, we can estimate the inflow profile of a production well, solving the inverse problem associated with the mathematical model for fluid flow in the well and the data. The accuracy in the estimated inflow profiles using different design of instrumentation can be computed, and an efficient way of searching for good designs of instrumentation is presented.
Knowledge about the inflow profile is important for optimal control of a production well. It also gives useful information for reservoir characterization and thereby helps to increase the oil recovery. Information about the inflow profile can be obtained from measurements in the well. To keep the cost low, but still getting maximum benefit of the measurements, the instrumentation must be designed with care.
The use of downhole pressure and temperature sensors is increasing, and the technology is advancing making measurements of other quantities possible as well. New technology also increases the opportunity for the engineers to control the production, for instance by shutting off water producing zones.
With the methodology we have developed, we can estimate the inflow profile of a production well. An analysis for comparing how well an inflow profile can be estimated with different designs of instrumentation is presented. Moreover, it can be searched for efficient designs of the instrumentation in order to get low error bounds on the estimated inflow profile. Cost constraints on the instrumentation can be taken into account, and use of redundant instruments can be avoided. Using the methodology presented it will be possible to obtain guidelines for the design of necessary instrumentation in existing and future wells.
Through a series of examples, we show that by selecting the correct instrumentation one can obtain great improvements in the accuracy of the estimated inflow profile. We also include an example on estimating the inflow profile from measured data.
A schematic picture of an instrumented well is shown in Figure 1.
Since we do not have any direct access to the inflow profile to the well, an indirect approach is needed to determine the inflow profile. For a given inflow profile, a well flow simulator can compute the values that different instruments located at different positions in the well will produce. This makes it possible to compare the measured data with simulated data for different inflow profiles, and to search for inflow profiles that will reconcile the measured data.
|File Size||443 KB||Number of Pages||9|