Valhall Field: Microfracture Acquisition Using Wireline-Formation-Tester Tools 
To Validate Fracture Confinement

Olson, Karen L.; O'Keefe, Micheel; Nicolaysen, Arild; Cameron, D.

doi:10.2523/96773-ms

Cited by 5 publications

(3 citation statements)

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“…Within six months, chalk influx, lost productivity, and liner deformations were severe and caused lost access to most of the horizontal sections. 32 As of 2005, over 200 propped fracs have been performed from horizontal wells in the field 33 , and current completion design has evolved to aggressive (TSO) designs with increasing proppant diameter and curable resin coatings to minimize proppant flowback. New horizontal wells were stimulated with 16/20 LWC and aggressive TSO designs, resulting in twice the productivity and 150% the cash flow of conventional wells.…”

Section: Comparison To Other Published Resultsmentioning

confidence: 99%

Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples

Palisch¹,

Vincent²,

Voronkov³

2006

Proceedings of SPE Russian Oil and Gas Technical Conference and Exhibition

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractNon-Darcy and multiphase flow effects in hydraulic fractures have been well documented during the last several years. The pressure losses due to these phenomena are widely accepted to be of great significance in most gas well completions in the United States and elsewhere. While the importance in gas wells is evident, the authors pose the question of whether non-Darcy and multiphase flow effects are of concern in typical oil wells in Russia.For the analysis, the authors evaluate three primary categories of Russian production wells: gas wells, oil wells producing above the bubble point, and oil wells producing below the bubble point. For each category, the authors describe the significance of non-Darcy and multiphase flow effects using fracture flow theory as well as state-of-the-art fracture production models. This paper will illustrate that non-Darcy and multiphase flow effects can substantially decrease the production potential of gas wells, as well as many of the oil wells found in Russia that are producing below the bubble point.Historically, Russian oil wells have been intentionally operated above the bubble point. However, more aggressive well designs have recently been shown to increase production by over three-fold. The authors explore the economics of producing these wells below the bubble point and show that for these more aggressive strategies, the effects of non-Darcy and multiphase flow can be significant and should be accommodated during fracture design.The authors propose solutions for mitigating these effects through various modifications to the fracture design including the impact of proppant selection on performance. Several operators within Russia have already successfully accounted for these phenomena in their fracture designs, and new field examples are explored, analyzed and presented in the paper. Recent field results are presented for Gazpromneft's Achimovskoya formation BV8 in Tomsk region (Western Siberia) and BP-TNK's field near Buzuluk in the Orenburg region (Volga-Urals). The results found here are compared to published results from the Achimovskoya sandstone in the Kalchinskoye oilfield, the BP12 formation of the Vyngayakhinskoe field, the Priobskoye and Sugmutskoe oilfields, and Gazprom's Yamburskoe gas condensate development.

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Section: Comparison To Other Published Resultsmentioning

confidence: 99%

Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples

Palisch¹,

Vincent²,

Voronkov³

2006

Proceedings of SPE Russian Oil and Gas Technical Conference and Exhibition

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“…Besides monitoring parameters such as rates, volumes, pressures, proppant loading and chemical concentrations some of them both on the surface and downhole, engineers now have resources such as tiltmeters, microseismic and various wirelines tools [48][49][50][51] .…”

Section: Key Aspects For Designing and Implementing Horizontal Complementioning

confidence: 99%

Horizontal Well Completion and Stimulation Techniques--A Review With Emphasis on Low-Permeability Carbonates

Rodrigues

Neumann

Torres

et al. 2007

Proceedings of Latin American &Amp; Caribbean Petroleum Engineering Conference

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fax 01-972-952-9435. AbstractThis paper presents a brief review of the available techniques in the oil and gas industry to complete and stimulate horizontal wells, with emphasis on low permeability carbonates. These techniques can also be applied in non-conventional reservoirs, particularly in tight formations. The paper starts by reviewing the lessons learned in some chalk fields in the North Sea (Dan, Halfdan, South Arne, Valhall and Eldfisk) and in a few pilot projects offshore Brazil (Congro and Enchova). Based on these lessons learned and in the broad literature, the paper devises some considerations on the methodology to select completion and stimulation techniques for horizontal wells. Cased and cemented horizontal wells, in addition to open hole and perforated/slotted liners wells are addressed. The macro aspects of field/area management are stressed as the completion and stimulation drivers. The key parameters for designing, implementing and evaluating horizontal completion and stimulation are presented, emphasizing the most common failures and the controversial aspects. The paper presents a summary of mature field and new scenarios that are candidate to horizontal completion and stimulation in Brazil and other Latin America countries. Then it makes a few comments on the resources available in Latin America to face the mentioned opportunities and related challenges. It is supposed that this brief review will be useful for the low permeability scenarios in Latin America and worldwide. Completion and Stimulation of North Sea Low-Permeability CarbonatesThe North Sea low permeability chalks are taken here as a reference due to the outstanding technological evolution verified there in the last decades. Amongst more than ten fields producing from these reservoirs in the North Sea this paper focuses on the Dan, Halfdan, South Arne, Valhall and Eldfisk fields. The main characteristics of these fields are: shallow waters (43 to 69 m), dry completion, high volumes of OOIP (1.6 to 2.9 billions barrel), low permeability carbonates (0.2 md to 10 md) with microfractures in the central areas (10 md to 120 md), high porosities (up to 48%), soft to very soft chalks, small to medium net pays (15 m to 65 m), high oil saturation (up to 97%), and light oils ( about 36 o API). What most distinguishes these fields is their over-pressured soft chalks which are subjected to a high degree of compaction under pore pressure depletion, resulting in loss of drilling fluids, rapid production decline, well failures and seafloor subsidence. On the other hand the positive effects of rock compaction as a reservoir drive energy, outweigh by far the negative ones. The recovery factor under primary recovery can be as high as 30%. In general the North Sea chalks experienced an evolution from vertical/directional wells stimulated with acid treatments to multiple fractured horizontal wells.

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“…)На Рисунок 20 показан профиль добычи для одного из интервалов месторождения Купарук. По данным 2005 года на этом месторождении было проведено свыше 200 ГРП 33 ,. Повторный ГРП был проведен на более чем 185 из 380 скважин к началу 1991.…”

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Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples (Russian)

Dedurin¹,

Majar²,

Voronkov³

et al. 2006

SPE Russian Oil and Gas Technical Conference and Exhibition

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Valhall Field: Microfracture Acquisition Using Wireline-Formation-Tester Tools To Validate Fracture Confinement

Cited by 5 publications

References 0 publications

Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples

Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples

Horizontal Well Completion and Stimulation Techniques--A Review With Emphasis on Low-Permeability Carbonates

Designing Hydraulic Fractures In Russian Oil And Gas Fields To Accommodate Non-Darcy And Multiphase Flow-Theory And Field Examples (Russian)

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