Geosteering Using New Directional Electromagnetic Measurements and a 3D Rotary 
Steerable System on the Veslefrikk Field, North Sea.

Wiig, Margrethe; Berg, Eirik; Kjaerefjord, Jostein; Saltnes, Magnar; Stordal, Einar; Sygnabere, Trond Olav; Laastad, Harald; Raeper, Graham; Gustavsson, Erika; Denichou, Jean-Michel; Darquin, Alexis; Omeragić, Dževat

doi:10.2523/95725-ms

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The latter can be obtained from deep resistivity measurements, which also reveal the position of the well trajectory in the vertical cross-section of the pay zone. 3 This type of information is required to generate the spread in PI shown in Fig. 1.…”

Section: Well Productivity Modelmentioning

confidence: 99%

Method and Utility of Well Productivity Estimation during Drilling

Zhang¹,

Jalali²

2010

Proceedings of International Oil and Gas Conference and Exhibition in China

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In this paper we describe two possible use cases of well productivity estimation obtained during the reservoir drilling process. The first concerns estimating a minimum and maximum value for the remaining reservoir footage that is required (beyond bit position) to achieve a target Productivity Index for the well. Thus the only criterion is well productivity not cost. The second concerns deciding within a pre-defined window the termination point of the well based on operator's cost-benefit criteria. The paper emphasizes description of use-case rather than description of the detailed methodology for obtaining these estimates. This is because feedback is required from teams involved in planning and execution of development wells on realistic and worthwhile use-cases, before deciding which option for productivity estimation is most appropriate and most efficient. In this paper, we present a basic method and simple examples based on synthetic data and mathematical solutions available in the literature. We place this in the context of reservoir drilling operations and decision-making.

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Section: Well Productivity Modelmentioning

confidence: 99%

Method and Utility of Well Productivity Estimation during Drilling

Zhang¹,

Jalali²

2010

Proceedings of International Oil and Gas Conference and Exhibition in China

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“…Statoil, together with the former Hydro, has been pushing electromagnetic measurements (EM) while drilling for geosteering long horizontals with great success. Examples from Troll, Grane, Velsefrikk, Oseberg and Gullfaks fields demonstrate the added value from both non-directional and directional bed-boundary mapping tools in the past, where NCS has played a key role in development and testing of LWD EM-measurements (Iversen et al 2003;Wiig et al 2005;Constable et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Net pay Optimization and Improved Reservoir Mapping From Ultra-Deep Look Around LWD-measurements

Antonsen

Olsen

Stalheim

et al. 2014

Day 1 Mon, November 10, 2014

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Statoil has played a key role in testing and development of the new ultra-deep directional resistivity (DDR) logging while drilling (LWD) measurements for high angle and horizontal wells the last 4 years. Inverted resistivity images provide an overview of geological structures and fluid contacts tens of meters around the wellbore. The ultra-deep look around measurements, sensitive to resistivity contrasts up to 30 m away or even more in favorable conditions, are a step change, when it comes to possibility to position the wellbore strategically in the reservoir and to characterize reservoir structure and properties. This paper will present how the new DDR measurements have been applied with success in an operating license on the Norwegian Continental Shelf (NCS). Long horizontal wells in the reservoir sections have been identified as a key strategy to increase recovery. The main benefits from the DDR measurements in the license have been to maximize reservoir exposure by active geosteering, to optimize well placement above oil-water contact, and to increase subsurface understanding which is important input for future well plans.The DDR measurements are already a commercial service with regard to well placement and reservoir landing. Statoil is however also actively pushing for improved reservoir characterization, by coupling geomodels and DDR modeling and inversion software. This paper will also present how standard LWD logs and images can be combined with the DDR inversion results, to build a near-wellbore 3D structural model supporting all available data. This is an important step towards an extended use of the new data not only for well placement, but also for increased subsurface understanding and geomodel update.

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Production Optimization for Second Stage Field Development Using ICD and Advanced Well Placement Technology

Maggs

Raffn

Porturas

et al. 2008

Europec/Eage Conference and Exhibition

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The paper covers the application of new technology drilling and completions equipment in horizontal wells to maximize production and recovery in a thin oil rim reservoir. The parallel process applied to the engineering design, drilling and completion operations, real-time decisions, and results are presented. As part of the second stage development of a mature oil field offshore Malaysia, a shallow target was identified. Initial engineering and reservoir studies suggested that three deviated wells or two horizontal wells would be required to develop the area. While the horizontal wells option was expected to have lower costs, the well construction was far more technically challenging. To ensure maximum production and recovery a 2,000ft lateral section was required, further detailed studies indicated that for the long lateral to be successful, well placement with respect to reservoir boundaries and fluid contacts, and open-hole sand screens of a high mechanical integrity would be critical. Additionally, in order to ensure even oil production and limit early water and gas production In-flow Control Devices (ICD) would be required as part of the completion. The well was actively steered using a Rotary Steerable System (RSS), and Logging While Drilling (LWD) measurements including a deep azimuthal resistivity distance to boundary device. Drilling was very efficient with the well placed close to the top of the sand, avoiding shale contact that could cause screen plugging, and the required distance from fluid contacts. The Real-Time (RT) logs were used to select optimum settings for the adjustable ICD completion prior to running in hole. The completion was run without incident and when the well was placed on line, produced without water breakthrough and without requiring gas lift due to effective clean-up of the entire horizontal section. Production from the well has exceeded expectations and is currently over double that of traditional wells. The application of advanced well placement technology and field adjustable ICD completions has enabled the economic development a small area of remaining hydrocarbon in a mature field, while maximizing production and recoverable reserves. Even with the increased technology cost, the overall project cost was 15% less than if standard well construction techniques had been applied. The accurate placement of the wellbore close to the upper shale and even production along the lateral due to the ICD completion has resulted in a more efficient reservoir sweep increasing recoverable reserves by ~100 MSTB.

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Geosteering Using New Directional Electromagnetic Measurements and a 3D Rotary Steerable System on the Veslefrikk Field, North Sea.

Cited by 3 publications

References 2 publications

Method and Utility of Well Productivity Estimation during Drilling

Method and Utility of Well Productivity Estimation during Drilling

Net pay Optimization and Improved Reservoir Mapping From Ultra-Deep Look Around LWD-measurements

Production Optimization for Second Stage Field Development Using ICD and Advanced Well Placement Technology

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