Recent Advances in Soil Response Modeling for Well Conductor Fatigue Analysis and Development of New Approaches

Zakeri, Arash; Clukey, Edward C.; Kebadze, Buba; Jeanjean, Philippe; Walker, Dan; Piercey, Gerry; Templeton, Jack; Connelly, Larry; Aubeny, Charles

doi:10.4043/25795-ms

Cited by 20 publications

(30 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Russo et al (2016) compare measured deformations and stresses obtained from monitoring a well in the North Sea to those predicted using the p-y relationships recommended by API (2011) and Zakeri et al (2016a;2016b; and conclude that the latter approach yields predictions much closer to the measurements despite uncertainties in the site's soil properties. Kannala et al (2016) used the NC clay formulation from Zakeri et al (2015) with site specific soil information for a deepwater well in the…”

Section: Background Informationmentioning

confidence: 99%

Development of novel apparatus to obtain soil resistance–displacement relationship for well conductor fatigue analysis

et al. 2017

Self Cite

View full text Add to dashboard Cite

An important aspect of deepwater well integrity is development of accurate conductor fatigue analysis due to cyclic loading during drilling operations. Fatigue damage in a structure occurs from stress changes in response to cyclic loading. In practice, the lateral cyclic soil response is typically modelled using Winkler p-y springs. However, recently developed soil models for conductor fatigue analysis were based on physical modelling in a geotechnical centrifuge.Notwithstanding the advantages of centrifuge modelling for investigating the conductor-soil interaction mechanism, development of simple laboratory tools to obtain p-y data directly from intact soil samples obtained from the field can also be very beneficial. This paper describes the development of a novel apparatus to obtain p-y and soil damping relationships from field samples specifically tailored for well conductor fatigue analysis. In addition, it compares the test results obtained using reconstituted kaolin clay and intact natural Onsøy clay to the centrifuge test results; ultimately demonstrating a satisfactory agreement between the two techniques.The results are highly encouraging and believe present a major step forward in deepwater well conductor fatigue analysis. The findings may also be beneficial to the offshore renewable energy sector.

show abstract

Section: Background Informationmentioning

confidence: 99%

Development of novel apparatus to obtain soil resistance–displacement relationship for well conductor fatigue analysis

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The objectives were to collect field data to develop a better understanding of the dynamic response of the well system (below the LMRP) and to evaluate performance of the recently developed soil models [1] for fatigue analysis in deepwater GoM clays. Sometime later, it required further operation with a drilling riser and Blowout Preventer (BOP) stack.…”

Section: Study Overviewmentioning

confidence: 99%

“…The p-y curves were generated at 1ft intervals up to 150 ft depth below the mudline based on the approach outlined by Zakeri et al [1] for normally-consolidated to lightly over-consolidated clays for each of the s u profiles. Figure 6 presents examples of the fatigue p-y curves: one at 4.0 ft within the crust and the other at 20.0 ft BML.…”

Section: Site-specific Geotechnical Information and P-y Datamentioning

confidence: 99%

“…Figure 6 presents examples of the fatigue p-y curves: one at 4.0 ft within the crust and the other at 20.0 ft BML. It should be noted that the p-y curves generated were based on the spring only parameters outlined by Zakeri et al [1] without inclusion of hysteretic damping. This was considered sufficient for system stiffness evaluation work presented herein.…”

Section: Site-specific Geotechnical Information and P-y Datamentioning

confidence: 99%

“…To that end, a study was conducted to compare displacement data obtained from a monitored top-tensioned riser well system in GoM (Figure 1) to those predicated via numerical modeling using the p-y curve recommended by Zakeri et al [1]. This paper describes the monitoring program and compares the results from predictive analysis using the recently developed fatigue p-y curve [1] derived site-specific geotechnical information to those measured in the field monitoring program.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Evaluation of Recently Developed Soil Models in Well Conductor Fatigue Analysis using Field Measurements

Kannala

Zakeri

et al. 2016

Day 3 Wed, May 04, 2016

Self Cite

View full text Add to dashboard Cite

American Petroleum Institute (API) [2] recommendations for modeling the lateral soil resistancedisplacement (p-y) response were not developed for fatigue analysis of deepwater wells. The recently developed soil models [1] is aimed to fill this knowledge gap. Based on extensive physical testing in a geotechnical centrifuge and complementary numerical modelling, a more accurate approach was developed for soil modeling specific to well conductor fatigue analysis. The approach was presented at OTC2015 [1]. While the approach proposed in [1] performed very well in predicting the fatigue damage in the model tests, its performance is yet to be evaluated against actual field data obtained in the field. This paper evaluates the performance of the recently developed soil models in predicting field measurements and fatigue damage obtained from a monitored well in the Gulf of Mexico (GoM). Important considerations for modeling soil response (e.g., modeling of soil crust near mudline) are also discussed. The new approaches are applicable to fatigue analysis of conductors pertaining to subsea wells worldwide. The motion monitoring loggers collect acceleration and angular rate information at the point of installation. The objective was to investigate the fatigue performance of the wellhead and conductor system. Fatigue was estimated based on the motion data collected from the data loggers. The measured motions and fatigue damage obtained from the loggers were compared to those estimated from predictive methods using the proposed soil model. This paper demonstrates that the recently developed soil models perform satisfactorily in predicting the deformations (displacements and rotations) measured at the top of the lower marine riser package (LMRP); hence, providing a more accurate prediction of the system (LMRP, wellhead and casings) response and thereby, its fatigue damage.

show abstract

Influence of soil–structure modelling techniques on offshore wind turbine monopile structural response

Sunday

2022

Wind Energy

View full text Add to dashboard Cite

The importance of appropriate offshore wind turbine (OWT) monopile structural modelling technique cannot be overstated in the successful design and installation of a new generation of larger and heavier structures to deliver the increasing capacity demand. The lack of clear design guidance and acceptable structural modelling techniques across the industry results in a range of conservative but expensive design and installation techniques. Most of the OWT monopile modelling efforts lie in the substructure (foundation) and interaction with the supporting soil which is highly nonlinear along the length of the embedment depth of the monopile structure. Typically, monopile offshore wind turbine structural modelling can be completed using, amongst others, one of the following techniques: 3D finite element modelling with mass soil foundation, API p-y curve soil springs, JeanJean soil springs, and the newly developed PISA modelling approach. The study presented in this paper considers the application of the 3D finite element modelling with mass soil, API p-y soil springs, and the JeanJean soil springs technique. By comparing the structural response, the 3D finite element modelling with mass soil results in an improved natural frequency and harmonic response. Furthermore, a reduced displacement was observed in the 3D finite element model with mass soil which will ultimately result in a corresponding improvement in the structure's useful operational design life. The application of the API p-y soil springs, JeanJean soil springs, and other modelling techniques requires extensive calibration to ensure the correct structural response and behaviour are achieved. This becomes a key factor as the boundaries of the size of the structure and turbine capacity are pushed even further for the new concept generation offshore wind turbines, which are required to deliver a higher capacity of 12 to 15 MW with the aim of achieving 20 MW, whilst achieving an efficient cost-effective engineering design and installation process.

show abstract

Recent Advances in Soil Response Modeling for Well Conductor Fatigue Analysis and Development of New Approaches

Cited by 20 publications

References 6 publications

Development of novel apparatus to obtain soil resistance–displacement relationship for well conductor fatigue analysis

Development of novel apparatus to obtain soil resistance–displacement relationship for well conductor fatigue analysis

Performance Evaluation of Recently Developed Soil Models in Well Conductor Fatigue Analysis using Field Measurements

Influence of soil–structure modelling techniques on offshore wind turbine monopile structural response

Contact Info

Product

Resources

About