RUTH - A Comprehensive Norwegian R & D program on IOR

Abstract

Leif Hinderaker, SPE, Norwegian Petroleum Directorate, Rolf H. Utseth, SPE, Statoil, Odd Steve Hustad and Idar Akervoll, SPE, IKU Petroleum Research, Mariann Dalland, Bjorn Arne Kvanvik, Tor Austad, and John Eirik Paulsen, SPE, RF-Rogaland Research. Abstract RUTH (1992-1995) was a four year Norwegian research program on improved oil recovery funded by Norwegian authorities and 18 participating oil companies. This paper describes how the program was organized and highlights the main results. Research was performed within six main themes: Gas flooding, combined gas-water injection including WAG, foam, polymer-gels, surfactant flooding, and microbial method. Applications in Norwegian fields are discussed with special focus on field pilot tests. The program contributed to establish a pilot-activity on three new methods, WAG, foam, and polymer-gel, on the Norwegian continental shelf. Introduction An important goal for Norwegian petroleum policy has been to secure the best possible exploitation of the petroleum resources. The initiation and implementation of IOR R&D programs have been an essential part of the strategy to reach this goal. Several major Norwegian IOR programs have therefore been initiated since the nineteen eighties. These are listed on Table 1. The Joint Chalk Research program, dedicated to improving hydrocarbon production from Norwegian and Danish chalk fields, was launched in 1982 on the initiative of Norwegian and Danish authorities. The state sponsored SPOR program, which was carried out during 1985 through 1991, focused on IOR and EOR methods, and had as its main goal to build a national Norwegian IOR expertise. Two follow-up programs were initiated after SPOR: The PROFIT program, concentrating on "Reservoir Characterization" and "Near Well Flow", and RUTH. PROFIT was a collaborative program between 13 oil companies and the Norwegian Petroleum Directorate (NPD). About 50 million USD have been invested in these programs, including RUTH. RUTH (Reservoir Utilization through advanced Technological Help) was a cooperative IOR effort conducted by the Research Council of Norway, the Norwegian Petroleum Directorate, Norwegian research organizations, and 18 oil companies. The total program budget was 106 million NOK. The Research Council of Norway funded 55 million NOK, and 51 million NOK was funded by the participating oil companies (1 USD is about 6.50 NOK). The program lasted 4 years (1992-1995), and a total of 32 projects were performed. RUTH aimed at following tip the research topics included in the SPOR program which were not conducted by other programs, and to include new subjects of strategic importance. The main objectives were:–Contribute to increase oil recovery from sandstone and chalk reservoirs on the Norwegian continental shelf by 300 million Sm3.–Meet the authorities' specific and long-term requirements for research on advanced oil recovery.–Help Norwegian research groups to further develop an internationally recognized expertise that can be of use to the oil companies. Additional objectives were to concentrate on applied research that is related to advanced recovery methods and to help qualify advanced technology by means of field tests. Of the three main objectives, we believe the first objective will be reached through the use of the developed technologies, and that the other two objectives have been met. P. 251

Management of Water Alternating Gas (WAG) Injection Projects

“…This is good since several WAG processes proposed in mature reservoirs and secondary recovery projects are planned to be conducted below the minimum miscibility pressure (Refs. 2,3,4).…”

“…The importance of understanding and using the geologic features of these fields presents the biggest opportunities to today's integrated multi-disciplinary teams (Ref. 2).…”

An experimental and numerical study of chemically enhanced water alternating gas injection

“…CO 2 gas injection is more desirable compared to other injection gases due to its lower injectivity problems, lower formation volume factor, abundance of reserves, and higher incremental oil recovery (Kulkarni 2003;Al-Abri and Amin 2010). The microscopic sweep efficiency of CO 2 injection is good; however, the mobility ratio which controls the volumetric sweep efficiency between CO 2 and oil is poor (Hinderaker et al 1996;Faisal et al 2009). Most of the CO 2 field projects have experienced early gas breakthrough at the producers (Martin et al 1988).…”

EOR Survey in the North Sea

“…Since 1982, several major Norwegian IOR programs 125 , as listed in Table 1, have been initiated for additional oil recovery. About 50 million USD have been invested in these Norwegian research programs (1982 -1995).…”