Assessing Fluid Migration and Quantifying Remaining Oil Saturation in a Mature Carbonate Reservoir: Dukhan Arab D
- Levin Jose Barrios Vera (Qatar Petroleum) | Tajjul Muhamad Rais (Qatar Petroleum) | Ali Trabelsi (Qatar Petroleum) | Ibrahim Al-Qarshubi (Qatar Petroleum) | Hussain Abdulla Al-Ansi (Qatar Petroleum)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 7-9 December, Doha, Qatar
- Publication Date
- Document Type
- Conference Paper
- 2009. International Petroleum Technology Conference
- 4.6 Natural Gas, 5.3.4 Reduction of Residual Oil Saturation, 5.4.1 Waterflooding, 5.6.2 Core Analysis, 5.8.7 Carbonate Reservoir, 5.1 Reservoir Characterisation, 5.3.2 Multiphase Flow, 5.5.8 History Matching, 5.5 Reservoir Simulation, 4.3.4 Scale, 5.6.1 Open hole/cased hole log analysis, 1.6 Drilling Operations, 5.2.1 Phase Behavior and PVT Measurements, 1.6.9 Coring, Fishing, 5.2 Reservoir Fluid Dynamics, 3.3 Well & Reservoir Surveillance and Monitoring, 5.5.2 Core Analysis, 5.6.5 Tracers, 5.1.1 Exploration, Development, Structural Geology, 5.7.2 Recovery Factors
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The large, mature Dukhan field is located onshore Qatar. The Arab D is the main oil reservoir in terms of size and production potential. The development of the reservoir commenced from North to South, which created initial differential pressure depletion between two of the southern sectors of the reservoir.
It is believed that differential depletion resulted in considerable fluid migration across sector boundaries. Therefore, it has introduced uncertainty in quantifying the remaining oil in place, recovery efficiency and reserves.
This paper describes the use of conventional material balance and volumetric techniques to investigate the reservoir behavior in order to shed light on fluid migration, the current oil in place and recovery efficiency, as well as identifying limitations and uncertainties. Material balance and fluid migration results indicated new scenarios for oil and water migration between the two southern sectors. The technique has proven to be valuable in understanding a complex reservoir engineering problem.
In order to better understand the migration process and to complement and validate the results of the material balance, and support the numerical simulation study, a data collection programme was carried out by drilling wells and low invasion cores in partially swept zones of the reservoir. The cores are used to determine remaining oil saturation (ROS), residual oil saturation (Sorw), wettability and relative permeability (SCAL) data. The preliminary results of this programme are presented in this paper.
Integration of the available and additional ROS and SCAL data will be instrumental during the subsequent stages of the reservoir study in defining the remaining reserves of the field and future upside potential of the reservoir. Therefore the work programme, assumptions and results presented in this paper may be of general interest and used as a reference for this kind of application.
The development of the remaining oil in some areas of the Arab D reservoir will largely depend on the understanding of the fluid migration. As part of the ongoing reservoir studies, conventional material balance and volumetric analyses were carried out on the Arab D reservoir with the aim of characterizing the current drive mechanism and quantifying fluid migration between reservoir sectors.
The first part of this paper describes this analysis which was performed in stages as follows:
- Collection and validation of input data.
- Analysis of production, injection and pressure histories.
- Single tank material balance analysis.
- Multi tank material balance and sensitivity analysis of fluid migration.
- Estimation of unswept remaining oil above the current oil-water contact by volumetric analysis.
- Determination of waterflood sweep efficiency.
|File Size||630 KB||Number of Pages||9|