A waterflood prediction study has been developed for the Dodsland Viking demonstrates the im-land Viking field in Saskatchewan. 7'his s d Portance of the geological descnptton used to accountforfieldwide variations in PVT properties. The methodology identifies the sig-nificance of @l wellbore effects (hydraulic fracture stimulations). The use of a modern simulator, which is fully implicit and uses improved Orthomin-type matrix solvers, enables modelling of this problem where older technolo f ils Finally, the r Its ar co gy a esu e m-Pared against actual offset Production Performance and models which do not account for local wellbore effects. Introduction in 95 ts oca The Dodsland-Hoosier Viking field was discovered 1953 tion in southwestern Saskatchewan is shown in Figure 1. The field consists of a complex series of oil and gas pools, as depicted in Figure 2. Development occurred rapidly during the late 1950s, fol-lowed by unitization arid subsequent waterfloods. A resurgence of development owmed during the early 1980s in response to govem-ment incentives.The Kiyiu Lake Voluntary Unit No. I was developed in 1983 and 1984. A waterflood was p@ed and goveminent approval ob-tarried during 1985. However, the dramatic dip m oil prices in ear-ly 1986 delayed implementation of the project. A detailed re-evaluation was commissioned by J.C. International Petroleum Ltd. to more closely evaluate waterflood econormcs under the more severe economic conditions of 1988. Geology The geology of the field was comprehensively documented m a paper by W.E. Evans(l). Two main factors control the occurrence of ofl and gas: (1) the separate linear sandstone bodies, which overlap; and, (2) the structure, which is controlled by underlying solution collapse and post depositional compaction. Figure 3 shows the axes of the overlapping members and Figure 4 displays the stratigraphic relationship of the sandstone bodies. Cross sections through the centre of the members (Fig. 5) demon-Keywords: Simulation, Waterflood, Dodsland, Viking, Hydraulic fractures. Paper reviewed and accepted for publication by the Editorial _ January 1992, Volume 31, No. 1 L4.land-iking id FIGURE 1. Map of showing location of the d-H Fidd. grate how both of the above factors resulted in a system of oil and gas accumulations shown earlier in Figure 2. The lithology of the field has been studied in detail by Tooth et al (2). The vast majority of the reservoir rock consists of fmely interlaminated sands, siltstone, and shales. These laminations are typically 13 nun (0.5 in.) thick. Core analysis, from wells near the study area, had porosities ranging from 1607o to 2401o and permea-bifities ranging from 0. I mD to 40.0 mD. The average porosity and permeability was 20.707o and 6.3 MD, respectively. A basal chert conglomerate is also found in some members, but is not thought to be present in si@cant amounts within the study area. Over-all, th, Viking formation in @s field is of poor quality. Production Characteristics production from such a low permeability reservoir required...
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