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• W1983834652 abstract "Abstract Gjøa is an oil and gas field located off the Norwegian Coast that is due to be developed with subsea infrastructure tied back to a floating production facility. Nine horizontal oil producers and four S-shaped gas producers are planned and all will require some form of sand prevention. Extensive rock mechanical work using Statoil's finite element modeling method suggests that oriented perforations can prevent sand production in the horizontal wells. This was offered as an alternative to mechanical sand control in the long horizontal wells due to traverse several shale and sand bodies of varying quality. Perforation tunnels with optimal structural stability for the given inherent material strength of the formation rock can be achieved by targeting perforations in the most stable direction with respect to the in-situ stress field. For high angle wells this normally equates to shooting in the vertical plane through the well path. Over a decade of production experience with this technique on the Norwegian Continental Shelf (NCS) confirms that oriented perforating can be a good sand prevention measure in suitable fields. Despite this track record and the rock mechanical analysis performed, the Gjøa project team wanted to conduct laboratory tests to confirm its applicability and also to optimize perforating parameters. An extensive laboratory test program was conducted on representative core and outcrop material. Five modified API RP 19B Section IV tests were performed to assess the influence of static and dynamic wellbore pressure conditions and wellbore fluid on perforation clean-up and PI. In addition, two tests were conducted on field core material in order to evaluate the sanding propensity of oriented perforations under conditions approximating those predicted during pressure depletion. The laboratory conditions required to induce sand production were quite extreme and vastly exceed the production scenario for the planned oil wells in the field. However, the cell geometry, boundary conditions and stress field in these experiments are not truly representative of the in-situ conditions around a true perforation in a well. In order to translate the sanding results into a conclusion relating to the validity of oriented perforating for the field, a finite element model was built to reproduce the lab conditions. This model correctly predicted the conditions required for sand failure as observed in the lab. This agreement provided validation of the operator's general sand prediction methodology and gave good confidence in the earlier rock mechanical predictions made for the field. Introduction A rock mechanical analysis for the Gjøa field (Figure 1) has concluded that all the wells will require some form of sand control measure installed in the reservoir section to prevent sand production. For the long horizontal oil wells that are due to be drilled sub parallel to the dip direction and that will penetrate several sand formations of varying quality, liner completions with oriented perforations (0/180 or 10/350o phasing) were ranked higher than more traditional mechanical sand control options. Stand Alone Screen (SAS) solutions are perceived to have a higher risk wrt running to TD, hole stability and plugging potential along a well path crossing significant intrareservoir shale packages. For Open Hole Gravel Pack (OHGP) completions the length of the planned wells (up to 2500 m) would incur both technical and logistical/cost challenges in addition to the risks associated with running screens." @default.
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• W1983834652 date "2008-02-13" @default.
• W1983834652 modified "2023-09-26" @default.
• W1983834652 title "Determination of Optimum Perforation Design and Sanding Propensity in Long Horizontal Wells Based on Modified RP 19B Section IV Tests and Numerical Sand Prediction" @default.
• W1983834652 doi "https://doi.org/10.2118/112050-ms" @default.
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