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Geotechnica l considera tions throughout the entire project lifecycle : from perception to executionGülin Yetginer, Equinor Leading Advisor Geotechnics
Open 25 September 20 19
Equinor: sha ping the future of energy«We a im to be the world's most ca rbon-efficient oil a nd ga s producer, a nd a re investing a ctive ly in renewa bles.»
Turning na tura l resources into energy for people a nd progress for society
3 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Explora tionDevelopment a nd productionRefining a nd processingMa rketing a nd tra ding
Ca na da
Mexico
Colombia
Argentina
USA
Nica ra gua
Ba ha ma s
Surina meVenezue la
Bra zil
Russia
China
Austra lia
Algeria
UKIre la nd
Greenla nd
Norwa y
Denma rk
Belgium
Netherla ndsGerma ny
Turkey Azerba ija n
UAE
Nigeria
Ta nza niaAngola
South AfricaUrugua y
Libya
South Korea
Indonesia
New Zea la nd
Singa pore
Opera tor of a sse tsJ oint venturePresence
Open 25 September 20 19
How ca n we ensure tha t considera tions do not become cha llenges?
cha llenge = unidentified risk
4 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 195 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 196 | Geotechnica l considera tions throughout the entire project lifecycle: from perception to execution
Open 25 September 20 19
Project Lifecycle : «The Ca pita l Va lue Process»
7 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
EngineeringEa rly Pha se
Prospect
Open 25 September 20 19
• “Memory”: the soil response depends on the geologica l a nd ma n-ma de pa st (ha s it been loa ded before? decrea sed porosity a nd wa ter content)
• “Mood”: the soil response depends on how we trea t it a nd loa d it (how much dra ina ge is expected)
• “Temper”: it is possible to trigger a n unexpected fa ilure if the bigger picture is not well understood (regiona l geology)
• Importa nt to perform a good qua lity soil investiga tion to a ssess the a bove a nd construct a ground model tha t presents the comple te picture
Ea rly Pha se : Understa nding the Soil
8 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Ea rly Pha se : Geoha za rds
• Pore pressure modelling• Slope sta bility• Sha llow ga s a nd other drilling ha za rds• Ea rthqua kes
9 | Geotechnica l considera tions throughout the entire project lifecycle: from perception to execution
Open 25 September 20 19
Desktop Study
• Informa tion sourcestypica lly a va ila ble during the desktop study pha sefor a new projectdevelopment in a ma turea rea (e .g. North Sea ):
• Geologica l se tting• Prelimina ry
geophysica linforma tion
• Geotechnica linforma tion from thela rger developmenta rea
• Insta lla tion experience
10 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Desktop Study
• Informa tion sourcestypica lly a va ila ble during the desktop study pha sefor a new projectdevelopment in a newa rea (e .g. Ta nza nia ):
• Geologica l se tting• Prelimina ry
geophysica linforma tion
11 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Ea rly Pha se : Soil Investiga tion Scope of Work Definition
12 | Geotechnica l considera tions throughout the entire project lifecycle: from perception to execution
“The scope of work for the ABC Development Area soil investigation consists of:• A detailed soil investigation at TEMPLATE X where geotechnical
information is required for foundation design purposes• Optional soil investigation at an additional template location • Optional soil investigation for an UnMannedWellhead Platform• Pipeline routes between the new template locations and existing
infrastructure to determine pipe soil interaction properties and to assess trenchability”
Open 25 September 20 19
Ea rly Pha se (a nd beyond): Opera tions
• Selection of geotechnica l drilling equipment: • Remoteness• Wa ter depth• Expected soil conditions• Potentia l geoha za rds
• Design a nd se lection of founda tion concept• All of the a bove• Insta lla tion / penetra tion
13 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Ea rly Pha se : Soil Investiga tion Cha llenges / La b Testing Considera tions
Tjelta , T.I. & Yetginer, A.G. 20 10 . Luva deepwater site investigation programme and findings. Proc. 2nd ISFOG.
14 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Ea rly Pha se : La b Testing
Worldwide Offshore Database Dogger Bank
15 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Loss of memory
Open 25 September 20 19
Engineering: Na tura l Va ria bility
10 0 9-1 10 0 9-1A Dista nce: 3m
16 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Engineering: Na tura l Va ria bility
• Da ta from boreholes kilometers a pa rt in a comple te ly different geologica l se tting
17 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Pla nned scope of work for the development a rea
A Moving Ta rge t?
18 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Fa cilities la yout upda ted oncethe subsurfa ce informa tion is further ma tured
Open 25 September 20 19
Execution: Wha t you see is not wha t you get!
19 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Wha t you see is not wha t you get!
• Na tura l e rosion of the sea bed due to scour
20 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 1921 | Geotechnica l considera tions throughout the entire project lifecycle: from perception to execution
Open 25 September 20 19
Wha t you see is not wha t you get!
• Ma nma de erosion of the sea bed due to drilling
22 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
Wha t you see is not wha t you get!
• Ma nma de erosion of the sea bed due to drilling
23 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
ISO 13628-15:20 11 Subsea Structures a nd Ma nifolds
24 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
Open 25 September 20 19
There is however one considera tion which will a lwa ys rema in a cha llenge…
25 | Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution
© Equinor ASAThis presentation, including the contents and arrangement of the contents of each individual page or the collection of the pages, is owned by Equinor. Copyright to a ll ma teria l including, but not limited to, written ma teria l, photogra phs, dra wings, ima ges, ta bles a nd da ta rema ins the property of Equinor. All rights reserved. Any other use , reproduction, tra nsla tion, a da ption, a rra ngement, a ltera tion, distribution or stora ge of this presenta tion, in whole or in pa rt, without the prior written permission of Equinor is prohibited. The informa tion conta ined in this presenta tion ma y not be a ccura te , up to da te or a pplica ble to the circumsta nces of a ny pa rticula r ca se , despite our efforts. Equinor ca nnot a ccept a ny lia bility for a ny ina ccura cies or omissions.
Gülin Yetginer, Equinor Lea ding Advisor Geotechnics
Geotechnica l considera tions throughout the entire project lifecycle : from perception to execution