Mechanical interference properties of two parallel strings in a deepwater dual-derrick drilling system

Liu, Xiuquan; Shi, Yan; Li, Yanwei; Liu, Zhaowei; Qiu, Na; Chang, Yuanjiang; Chen, Guo-Ming

doi:10.1016/j.oceaneng.2023.113720

Cited by 7 publications

(8 citation statements)

References 35 publications

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“…In practice, F(t) is produced by the top tensioner and it is essentially nonlinear with respect to the displacement x 1 (t). In the works, [5][6][7]12,14,17,27,28 the linearization method based on Taylor series is used to obtain an affine linear function F(t) = F 0 − k 1 x 1 (t) − u(t) and some linear control strategies are proposed, where F 0 = P h a r − P l a p and k…”

Section: Riser-tensioner Modelmentioning

confidence: 99%

“…The nonlinearities of riser-tensioner system (9) mainly comes from the nonlinear terms 1∕(V h + a r x 1 (t)) 𝜅 and 1∕(V l − a p x 1 (t)) 𝜅 and u(v(t)) in F(t), which can directly affect the system dynamics and recoil control effect. In the existing literature, [5][6][7]12,17,27,28 a linearization method based on Taylor series is used to handle the F(t) at the point x 1 (t) = 0, and the saturation nonlinearity is not considered. However, in this article, the auxiliary system combining with the change of coordinates is constructed to generate the signals 𝜇 i (t) (i = 1, … , 6) that compensate for effect of the u(q(t)).…”

Section: Nn-based Adaptive Backstepping Control Designmentioning

confidence: 99%

“…Similar to the model of DDRSs in References 5–7,12,14,17,27, and 28, considering the tension force with saturated control input (1) and the friction force (5), we describe the dynamic equations of the riser‐tensioner system by

({, \begin{matrix} left \\ array m_{1} {\ddot{x}}_{1} (t) = F (t) - m_{1} g - k_{2} (x_{1} (t) - x_{2} (t)) - c_{2} ({\dot{x}}_{1} (t) - {\dot{x}}_{2} (t)) - c_{1} {\dot{x}}_{1} (t) - {\overline{f}}_{1} (t) + f_{b_{1}}, \\ array m_{2} {\ddot{x}}_{2} (t) = k_{2} (x_{1} (t) - x_{2} (t)) + c_{2} ({\dot{x}}_{1} (t) - {\dot{x}}_{2} (t)) - m_{2} g - c_{3} (...</p>) \end{matrix})

…”

Section: System Modeling and Problem Formulationmentioning

confidence: 99%

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Adaptive finite‐time recoil control of deepwater drilling riser systems with nonlinear forces and saturation input using switched event‐triggered scheme

Cheng,

Zhang,

Zhu

2024

Intl J Robust & Nonlinear

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This article investigates the finite‐time recoil control problem of deepwater drilling riser systems with nonlinear friction force, tension force and saturation input. For the friction force, a new approximation model based on radial basis function neural networks is presented, which not only can ensure a better approximation effect than the sine‐function type and exponential‐polynomial‐function type computational models, but also can be easily used for control design. Different from the existing linear optimal control methods, a neural‐network‐based adaptive backstepping control method is proposed to deal with the nonlinear friction and tension forces, which can achieve better recoil control responses. An auxiliary system combining with the change of coordinates is employed to compensate the saturation input effect. To prolong the average release interval of control input while preserving satisfied control performance, a new switched event‐triggered control (ETC) scheme is developed, in which the triggering conditions are switched between the fixed and relative thresholds based on the strength of control signal. With the event‐triggered controller, the practical finite‐time stability condition of recoil control system is derived and the Zeno behavior is avoided. Numerical results are given to show the advantages of the proposed methods in handling the model nonlinearities, finite‐time stability and ETC performance of riser‐tension systems.

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Section: Riser-tensioner Modelmentioning

confidence: 99%

Section: Nn-based Adaptive Backstepping Control Designmentioning

confidence: 99%

({, \begin{matrix} left \\ array m_{1} {\ddot{x}}_{1} (t) = F (t) - m_{1} g - k_{2} (x_{1} (t) - x_{2} (t)) - c_{2} ({\dot{x}}_{1} (t) - {\dot{x}}_{2} (t)) - c_{1} {\dot{x}}_{1} (t) - {\overline{f}}_{1} (t) + f_{b_{1}}, \\ array m_{2} {\ddot{x}}_{2} (t) = k_{2} (x_{1} (t) - x_{2} (t)) + c_{2} ({\dot{x}}_{1} (t) - {\dot{x}}_{2} (t)) - m_{2} g - c_{3} (...</p>) \end{matrix})

…”

Section: System Modeling and Problem Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Adaptive finite‐time recoil control of deepwater drilling riser systems with nonlinear forces and saturation input using switched event‐triggered scheme

Cheng,

Zhang,

Zhu

2024

Intl J Robust & Nonlinear

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show abstract

“…In turn, the recommended safe operating time, s operating condition window and BOP trolley design restraint reaction force resu throughout the year are given. At the same time, the following assumptions are made facilitate the solution of the finite element model: (1) the landing string is an isomet slender rod, ignoring the effects of joints and section changes; (2) the material of the pi column is linear elastic, homogeneous and isotropic; (3) the top of the string is connect to the platform, and the bottom is regarded as the free end, ignoring the influence of t platform movement on the string.…”

Section: Stage Analysismentioning

confidence: 99%

“…During casing operation of drilling without riser section in the deep-water surface, the landing string is in contact with the sea water, and bending deformation occurs under the action of wind force, sea current force and wave force [1][2][3]. The upper part of the string is connected to the drilling platform, and the deformation of the string cannot be reduced by changing the top tension [4,5].…”

Section: Introductionmentioning

confidence: 99%

Loads Calculation and Strength Calculation of Landing String during Deepwater Drilling

et al. 2023

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As an important drilling tool, the landing string will be directly exposed to seawater during surface riserless drilling operations, and it will undergo complex deformation under the action of environmental loads such as ocean currents and waves and the displacement, heave and vibration of the drilling platform. At the same time, with the increase in water depth, the floating weight of drill pipe and casing also increases significantly, and the landing string will bear great tensile loads, which can easily cause accidents. Therefore, in this paper, based on ANSYS software, the finite element analysis models of three stages of the landing string lowering operation were established, and finite element simulations under different combinations of working conditions were carried out. Through theoretical analysis and numerical simulation, the ultimate load and stress distribution of the string under different operating sea conditions were obtained, and the external force requirements for restraining the lateral displacement of the string were proposed according to the existing standards of the industry. Thereby, the recommended safe operating time, safe operating conditions window and the required restraint reaction force of the support mechanism are given for landing string lowering operation throughout the year.

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A fully coupled nonlinear dynamic model for drilling riser system

Liu,

Li,

Tian

et al. 2024

Nonlinear Dyn

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Mechanical interference properties of two parallel strings in a deepwater dual-derrick drilling system

Cited by 7 publications

References 35 publications

Adaptive finite‐time recoil control of deepwater drilling riser systems with nonlinear forces and saturation input using switched event‐triggered scheme

Adaptive finite‐time recoil control of deepwater drilling riser systems with nonlinear forces and saturation input using switched event‐triggered scheme

Loads Calculation and Strength Calculation of Landing String during Deepwater Drilling

A fully coupled nonlinear dynamic model for drilling riser system

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