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The single well chemical tracer (SWCT) test can be used to evaluate an Improved oil recovery (IOR) process quickly and inexpensively. The one-spot procedure takes advantage of the nondestructive nature of the SWCT method. The single-well (one-spot) pilot is carried out in three steps. First, Sor for the target interval is measured (see Residual oil evaluation using single well chemical tracer test. Then an appropriate volume of the IOR fluid is injected into the test interval and pushed away from the well with water.
Islam, M. S. (Dhofar University Salalah, Oman) | Kleppe, J.. (Norwegian University of Science and Technology, Trondheim, Norway) | Rahman, M. M. (Rahman, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh) | Abbasi, F.. (Dhofar University Salalah, Oman)
Abstract Low salinity water-flooding (LSW) is a promising Improved Oil Recovery (IOR) process in which the salinity of the injected water is controlled to progress oil recovery over conventional seawater-flooding and other EOR methods. Published laboratory studies and field test cases in the last two decades have suggested several mechanisms of oil recovery by LSW, which is still an immature area of research. However, the commercial reservoir simulators have limited capability to model LSW accurately. The principal objective of this paper is to evaluate the potential of IOR using LSW for the Norne Field's E- segment. There is about 60% oil is still trapped as residual oil especially in the Ile and Tofte formations of the Norne Field's E-Segment even after the completion of primary recovery and seawater-flooding as a secondary recovery technique. LSW simulation is, therefore, run for a period of 18 years from 2005 to 2022 to extract this residual oil adhered to rock wall. LSW simulation studies using original wells indicated that water injection with optimal salt concentration of 1,000 ppm TDS (total dissolved salts) or kg/m yields substantially higher oil production (34.13 MSCM) compared to seawater-flooding (32.95 MSCM). With the encouraging finding of LSW, the next stage of the study is involving simulation of different scenarios. Six different cases have been investigated. Case 1 is the base case with seawater- flooding using the existing wells. The other five cases are all LSW, with the following well configurations: (2) using the original wells, (3) using the original wells in addition to a new producing well, (4) using the original wells in addition to a re-completed producing well, (5) using the original wells in addition to a new injection well, and (6) using the original wells in addition to a re-completed injection well. Case 3 indicated the highest oil recovery (50.10 MSCM) compare to other five cases. Thus, it could be concluded that the Norne Field's E-Segment is a good candidate for LSW to extract the residual or trapped oil. In this study, LSW simulation results have shown the alteration of wettability from neutral-wet to strongly water-wet, which in turn is resulting in a favorable mobility ratio, is the most important IOR mechanism for the Norne Field's E-Segment. LSW in this case is found to give near to piston-like displacement.
IOR methods, for this study, consist of Comparing these criteria with values from processes in which an injection fluid is the reservoir of interest yields an indication used to improve the recovery of oil from a of success of the IOR projects Defining qualitative variables was another hydrocarbon reservoir. IOR includes the By its nature, screening can be considered data-quality issue. Aquifer strength was following processes: waterflood; miscible only a coarse judgment on the suitability of particular concern.
Evaluation of IOR Potential of Petroleum Reservoirs Evaluation of IOR Potential of Petroleum Reservoirs Alex T. Turta, Fred Wassmuth, Brij B. Maini and Ashok K. Singhal Petroleum Recovery Institute, Calgary Abstract. A consistent screening technique was developed to quickly evaluate the Improved Oil Recovery (IOR) potential of oil reservoirs. This evaluation consists of : checking reservoir's geological /production data for consistency, selection of technically feasible IOR processes, performance projection for the selected IOR processes, and generating a complete IOR report, containing all the production and injection plots. A software (PRIzeTM) was built based on this screening technique. This computer program generates information on the feasibility of IOR processes based on the average reservoir parameter values, the driving mechanisms, and the current understanding of IOR processes; analytical models are used for most predictions. These analytical models have been selected by distilling a significant number of forecasting methods in the open literature. This paper discusses the PRIzeTM-based experience in evaluating the potential of waterflooding, chemically assisted waterflooding, miscible gas injection (CO2, hydrocarbon, and N2), and thermal recovery processes (steam drive, SAGD and in-situ combustion). Options for using horizontal wells in conventional oil recovery and IOR processes are also addressed. Although PRIzeTM is not a numerical simulator, it allows one to establish, to a first order approximation, the likely performance for determining economic viability of a given IOR process. can, in turn, be used for risk and economic
analyses. The screening criteria are based on Selection of Improved Oil Recovery statistics of successful commercial IOR (IOR) process is extremely important projects worldwide. All reservoir because, as a rule only 10% of the total IOR engineering equations and algorithms used pilots have been developed into to generate the oil recovery forecasts of semi-commercial and commercial individual IOR schemes have been operations. This figure was generated from established by distillation of a significant a 2-decade statistics on IOR pilots in number of forecast methods existing in the USA1,2. Many of IOR field pilots have open technical literature. When necessary failed because the most appropriate IOR they were improved using our own method was not chosen. To assist in this, a experience. specialized software, PRIzeTM, was created With the exception of steam in 1992, and has been continuously assisted gravity drainage (SAGD), the updated and improved since. Our intent screening and the prediction calculations are here is to present the technical content of performed only for IOR methods, which are this software. proven via commercial operations. A general IOR method, applicable However, we included SAGD because of an to the complete range of field situations, impressive success in a semi-commerci