Comprehensive Mini-Frac Testing in the Gullfaks Field as a Tool for Characterization of Reservoir Structure and Rock Mechanics

Bale, Arthur; Fossen, Haakon; Berg, Eirik; Mjelde, Øystein; Kui, Trond

doi:10.2523/iptc-11968-ms

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…The quantitative evaluation of drillability has vital importance on both drilling bit selection and drilling parameters optimization. Currently there are mainly two types of drillability evaluation methods: one is the indoor micro drill bit experimental method [2][3][4]; the other is logging data evaluation method [5][6][7][8][9][10][11][12]. These existing evaluation methods are usually conducted at atmospheric pressure, the result of which deviates heavily from the real Rock Drillability under complex bottom hole stress conditions, thus can't contribute to the design of underbalanced drilling and ultra-deep drilling practice.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Formation Rock Drillability under Complex Bottom Hole Stress Conditions

Zhang¹,

Zhao²,

Zheng³

et al. 2017

dteees

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Abstract. The rock drillability measurements are usually conducted at atmospheric pressure, the results deviate heavily from the real Rock Drillability under complex bottom hole stress conditions. In this paper, a newly devised rock drillability testing apparatus with a cone bit is utilized to investigate the rock drillability under various bottom hole differential pressures and different effective stress conditions. The experimental results showed that both bottom hole differential pressure and effective stress have great impact on rock drillability: the smaller the bottom hole differential pressure, the smaller the formation rock drillability index and thus the easier to break the rock; the greater the effective stress, the larger the formation rock drillability index and thus the harder to crush the rock. Mathematical statistics methods have been applied to analyze the correlation between rock drillability index and bottom hole differential pressure, effective stress as well as the rock drillability index at atmospheric pressure. This model provided an important approach to forecast rock drillability under various bottom hole differential pressure conditions based on rock drillability measured at atmospheric pressure. Compared to directly testing under bottom hole stresses, this method is easier to conduct and cost saving.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Formation Rock Drillability under Complex Bottom Hole Stress Conditions

Zhang¹,

Zhao²,

Zheng³

et al. 2017

dteees

View full text Add to dashboard Cite

show abstract

A contribution to the petrophysical knowledge of the Lourinhã Formation as an analogue for the Statfjord Formation in the North Sea oil and gas fields

Ludovico-Marques¹

2020

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The Lourinhã Formation in the western region of Portugal is an analogue for the Statfjord Formation in the oil and gas fields of the Norwegian Northern North Sea. This petrophysics study encompasses a specific sandstone variety (M variety) of the Lourinhã Formation. This lithic arkose shows an average value of effective porosity of 18.5% and a permeability range of 20–30 mD, and is representative of the distribution range in the petrophysics models of the reservoirs of the Statfjord Formation. The petrographical, physical and mechanical characterization of the M variety sandstone is compared with the main features of the oil- and gas-producing sandstones of the Statfjord Formation in a reference well in the Norwegian Northern North Sea. Efficient enhanced oil recovery (EOR) projects in the oil and gas fields of the Norwegian Gullfaks hub are always needed, and this study intends to provide a contribution to that endeavour.

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Comprehensive Mini-Frac Testing in the Gullfaks Field as a Tool for Characterization of Reservoir Structure and Rock Mechanics

Cited by 2 publications

References 2 publications

Experimental Investigation of Formation Rock Drillability under Complex Bottom Hole Stress Conditions

Experimental Investigation of Formation Rock Drillability under Complex Bottom Hole Stress Conditions

A contribution to the petrophysical knowledge of the Lourinhã Formation as an analogue for the Statfjord Formation in the North Sea oil and gas fields

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