Using Suction Technology for Deep Installation of Structural Pipe in Deepwater

Faul, Gary; Audibert, Jean M.E.; Hamilton, Thomas

doi:10.2118/39336-ms

Cited by 2 publications

(1 citation statement)

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“…Scholars have also conducted relevant work, including load-carrying capacity experiments and finite element analyses. Faul et al proposed suction technology as an attractive alternative to current well construction methods of jetting, harming, drilling or post-drilling cementing, which could improve structural casing, foundation piles and caissons in deepwater, increase structural integrity and provide significant cost savings for deepwater projects and infrastructure construction [26]. Sivertsen and Strand proposed a new subsea shallow well construction method and presented the design idea of conductor suction pile [27].…”

Section: Introductionmentioning

confidence: 99%

Research on Lateral Load Bearing Characteristics of Deepwater Drilling Conductor Suction Pile

Li,

Yang,

Zhu

et al. 2024

Energies

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The vast reserves of natural gas hydrates in offshore areas present significant challenges to development. Surface well construction technology is crucial for the extraction of deepwater natural gas hydrates. To ensure the safety of the subsea wellhead during the drilling process for deepwater natural gas hydrates, a novel conductor suction pile device has been designed, comprising a combination of suction piles and surface conductors. And research has been conducted to investigate the lateral stability characteristics of the conductor suction pile. Drawing upon the pile foundation load-bearing theory and the equilibrium of the differential element, a theoretical analysis model and corresponding governing equations of the conductor suction pile system are established. A solution for a multi-point boundary value problem by simplifying the conductor suction pile system into a two-end free beam is proposed. The governing equations are then converted into a first-order differential equation system, and the four-stage Lobatto IIIa collocation method program for the multi-point boundary value problem is developed and resolved using MATLAB 2023a. Furthermore, a case study of a well in the South China Sea elucidates the effects of wellhead load and seabed soil properties on the lateral load-bearing capacity of the conductor suction pile system, verifying the collocation method’s validity against the results from the finite difference method. After conducting a comparative analysis of the lateral load-bearing performance between conductor suction piles and traditional surface conductors, it is observed that conductor suction piles exhibit lower horizontal displacement and bending moments compared to surface conductors. Therefore, conductor suction piles demonstrate a substantial safety margin. The research findings provide a theoretical basis for the lateral stability of conductor suction piles during deepwater natural gas hydrate drilling. This offers a safe and efficient method for surface well construction in the extraction of natural gas hydrates.

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Section: Introductionmentioning

confidence: 99%

Research on Lateral Load Bearing Characteristics of Deepwater Drilling Conductor Suction Pile

Li,

Yang,

Zhu

et al. 2024

Energies

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Conductor Pre-Installation, Deepwater Brazil

Noort

Murray²,

Wise

et al. 2009

All Days

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This paper presents the requirements that led to the successful implementation of a subsea hydraulic hammer for installation of conductors offshore Brazil.The Parque das Conchas development required conductors both for wells and for the two Artificial Lift Manifolds (ALM). For the 36 inch well conductors it was important that the conductors were installed off the rig critical path and for the 48 inch ALM conductors the critical issue was the accuracy of the conductor height for subsequent manifold placement. The solution was to install the respective conductors using a subsea hammer deployed from an Anchor Handling Vessel (AHV).The ALM templates were transported offshore vertically on the AHV's A-frame, submerged and rotated to a horizontal position, and deployed to the seafloor. Once the templates were correctly positioned, the well and ALM conductors were transported offshore on a specially outfitted barge. The conductors were launched from the barge while connected by a line to the anchor handler. Then they were lowered and allowed to self-penetrate into the seabed. Once all the conductors were installed, they were hammered to depth using a subsea hydraulic hammer. Both ALM templates were placed accurately in position within 1.5 deg heading and 0.5 m in the horizontal plane and all conductors were successfully installed within verticality and height tolerances.The campaign included many industry firsts, in water depths ranging between 1650 and 1920m in relatively harsh metocean conditions. The industry firsts include:• Vertical template transportation/insertion through water plane followed by horizontal lowering from AHV • Deepwater hydraulic hammer spread deployed and operated from AHV • A new depth record (1920 m water depth) for deepwater hammering. With the installations in Brazil the operating envelope of deepwater conductor installation with a hydraulic hammer has been significantly increased and provides a viable alternative to conductor installations with a deepwater drilling rig.

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Using Suction Technology for Deep Installation of Structural Pipe in Deepwater

Cited by 2 publications

References 0 publications

Research on Lateral Load Bearing Characteristics of Deepwater Drilling Conductor Suction Pile

Research on Lateral Load Bearing Characteristics of Deepwater Drilling Conductor Suction Pile

Conductor Pre-Installation, Deepwater Brazil

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