The Optimal Application of Multi-Lateral / Multi-Branch Completions

Sugiyama, Hironori; Tochikawa, Tetsuro; Peden, J.M.; Nicoll, G.

doi:10.2523/38033-ms

“…5,6 This technology gap is significant for multilateral ER wells. 7,8 Previously, access to individual branches was not possible, 9,10 which prevented effective stimulation and production logging of individual laterals. Acid had to be bullheaded down wellbore tubulars or coiled tubing with the end of pipe near the lateral entrance.…”

Section: Spe 93500mentioning

confidence: 98%

A Novel Technique to Acidize Multilateral Open Hole ER Horizontal Wells Drilled in Carbonate Formations

Nasr‐El‐Din

¹

,

Al-Habib²,

Al-Khamis

³

et al. 2005

SPE Middle East Oil and Gas Show and Conference

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fax 01-972-952-9435. AbstractA new development strategy used by Saudi Aramco for carbonate reservoirs is to drill multilateral, extended reach, horizontal and fishbone wells. This strategy has a significant impact on reducing the development cost per bbl of oil produced, by drilling less wells and requiring less offshore platforms. This is also applied for the development of carbonate reservoirs in highly populated areas.Drilling multilateral wells is intended to maximize reservoir drainage and minimize water production due to water coning. However, inherent problems with these wells are poor accessibility and uneven acid distribution during matrix acidizing, especially in reservoirs with high permeability streaks. This paper discusses an innovative approach to treat multilateral wells. This technique comprises mechanical diversion in the wellbore and chemical diversion in the formation.In the past, reentry access to sidetracks from an open hole main wellbore was not possible. This prevented remedial operations on individual laterals and precluded effective reservoir management. To selectively enter and stimulate the desired lateral, a coiled tubing conveyed orienting tool was used. This ensured better acid distribution over the wellbore. To enhance acid diversion in the formation, a viscoelastic surfactant-based acid system was employed.Well "A" is an offshore dual open hole multilateral horizontal well with a motherbore length of 2,256 ft and a lateral section of 3,558 ft. The lateral was rotary jetted with acidic brine during the completion phase, but the well did not sustain flow after a nitrogen gas lift.A special CT conveyed multilateral tool was successfully used to enter the lateral. A viscoelastic surfactant-based acid was utilized to remove formation damage induced by drilling fluids, and to enhance the permeability of the formation in the critical wellbore area.The well responded to the acid treatment and its production exceeded expectations. Challenges, design criteria, field treatment and evaluation, lessons learned, and recommendations are discussed in this paper.

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“…Main geologic criteria for MLT application were defined based on literature review of experience [1][2][3][4][5][6][7][8][9][10][11][12][13][14] of applying MLT in Russia and over the world. Resources are however always limited, and there is no sense in constructing models and calculating parameters for all development targets.…”

Section: Subsurface Selection Of Priority Reservoirsmentioning

confidence: 99%

“…[6,1,3,4,5,2] Factor Unit Score Cumulative oil ratio var 2 (1HW+1VW) to var 1 (3VW) Cumulative oil ratio var 3 (MLT45) to var 1 (3VW) [6,1,3,4,5,2] Factor Unit Score Cumulative oil ratio var 2 (1HW+1VW) to var 1 (3VW) Cumulative oil ratio var 3 (MLT45) to var 1 (3VW) …”

Section: Weight Commentmentioning

confidence: 99%

Justification of Applying Multilateral Wells in Samotlor Field

Sunagatullin¹,

Arzhilovskiy²,

Manapov³

et al. 2010

All Days

1

0

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In this paper the authors are providing a feasibility study of drilling multilateral wells (MLT) in Samotlor field. The main objective of MLT in Samotlor is to increase reservoir sweep and improve drilling economic effectiveness.To select priority targets a ranking was made through expert evaluation. The feasibility study was conducted for development targets based on sector dynamic models. Minimal required levels of MLT design complexity were chosen for MLT economic evaluation. Work results allow taking a decision on the expediency of implementing MLT technology in the pilot block of Samotlor field, and also a range of additional efficiency of MLT wells versus horizontals wells (HW), depending on reservoir parameters. The article provides a comparative analysis of HW and MLT performance efficiency. The paper includes conclusions on MLT technology efficiency, as well as MLT applicability limits for the Samotlor targets depending on reservoir parameters. The criteria and approach used when appraising MLT can be applied to other fields.

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“…5,6 This technology gap is significant for multilateral ER wells. 7,8 Previously, access to individual branches was not possible, 9,10 which prevented effective stimulation and production logging of individual laterals. Acid had to be bullheaded down wellbore tubulars or coiled tubing with the end of pipe near the lateral entrance.…”

Section: Spe 93500mentioning

confidence: 99%

Untitled

Nasr‐El‐Din¹,

Al-Habib²,

Al-Khamis³

et al. 2005

Proceedings of SPE Middle East Oil and Gas Show and Conference

0

View full text Add to dashboard Cite

fax 01-972-952-9435. AbstractA new development strategy used by Saudi Aramco for carbonate reservoirs is to drill multilateral, extended reach, horizontal and fishbone wells. This strategy has a significant impact on reducing the development cost per bbl of oil produced, by drilling less wells and requiring less offshore platforms. This is also applied for the development of carbonate reservoirs in highly populated areas.Drilling multilateral wells is intended to maximize reservoir drainage and minimize water production due to water coning. However, inherent problems with these wells are poor accessibility and uneven acid distribution during matrix acidizing, especially in reservoirs with high permeability streaks. This paper discusses an innovative approach to treat multilateral wells. This technique comprises mechanical diversion in the wellbore and chemical diversion in the formation.In the past, reentry access to sidetracks from an open hole main wellbore was not possible. This prevented remedial operations on individual laterals and precluded effective reservoir management. To selectively enter and stimulate the desired lateral, a coiled tubing conveyed orienting tool was used. This ensured better acid distribution over the wellbore. To enhance acid diversion in the formation, a viscoelastic surfactant-based acid system was employed.Well "A" is an offshore dual open hole multilateral horizontal well with a motherbore length of 2,256 ft and a lateral section of 3,558 ft. The lateral was rotary jetted with acidic brine during the completion phase, but the well did not sustain flow after a nitrogen gas lift.A special CT conveyed multilateral tool was successfully used to enter the lateral. A viscoelastic surfactant-based acid was utilized to remove formation damage induced by drilling fluids, and to enhance the permeability of the formation in the critical wellbore area.The well responded to the acid treatment and its production exceeded expectations. Challenges, design criteria, field treatment and evaluation, lessons learned, and recommendations are discussed in this paper.

show abstract

The Optimal Application of Multi-Lateral / Multi-Branch Completions

Cited by 9 publications

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A Novel Technique to Acidize Multilateral Open Hole ER Horizontal Wells Drilled in Carbonate Formations

A Novel Technique to Acidize Multilateral Open Hole ER Horizontal Wells Drilled in Carbonate Formations

Justification of Applying Multilateral Wells in Samotlor Field

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