Abnormal down hole pressure variation by axial stick-slip of drillstring

Zhao, Dapeng; Hovda, Sigve; Sangesland, Sigbjørn

doi:10.1016/j.petrol.2016.04.004

Cited by 26 publications

(15 citation statements)

References 10 publications

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“…To analyze WOB transfer capacity, the dynamic drag and torque model is established. The basic assumptions of this model are described as follows 40,41 : (1) The drill string is in elastic deformation. (2) The gap between drill string and wellbore is ignored; the axis of drill string is coincidence with axis of wellbore.…”

Section: The Dynamic Drag and Torque Modelmentioning

confidence: 99%

Development of torque clutch drilling tool and evaluation of drag reduction performance

Wang

Chen

Huang

et al. 2018

Advances in Mechanical Engineering

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Horizontal well is one of the important methods of unconventional oil and gas resource development. As increasing length of horizontal section, there is a serious problem that axial force cannot transfer to bit. The drilling field needs a low-friction and low-cost drag reduction tool. This article summarized existing technologies of drag reduction in the horizontal and inclined well and proposes an integrated design of torque clutch. Detailed design of tool subsystems is introduced. The tool includes three subsystems: clutch, hydraulic system, and monitoring system. The clutch is consisted of multiple clutch units mounted in a parallel arrangement. Power of hydraulic control system adopts difference in pressure between inside and outside of drill pipes. It can efficiently reduce power consumption. The design function and minimum working pressure are validated and obtained by indoor test. According to theoretical calculation, reasonable distance from tool to bit can be obtained for an actual drilled well. During directional drilling mode, the tool can reduce more than 30% axial drag of drill string according to theoretical calculation. The tool can effectively improve the capacity of transfer weight to bit and overcome the excessive drag in horizontal drilling. No similar tools are reported in the current field.

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Section: The Dynamic Drag and Torque Modelmentioning

confidence: 99%

Development of torque clutch drilling tool and evaluation of drag reduction performance

Wang

Chen

Huang

et al. 2018

Advances in Mechanical Engineering

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show abstract

“…More precisely, in these models, the stick-slip phenomenon is assumed to be related to the velocity-weakening of the frictional force at the bit (Stribecklike effect) associated with typical dry friction profiles (static friction and dynamic friction) [3], [16]. However, the bit-rock interaction is not the only cause of stick-slip; for instance, it would not explain the occurrence of such oscillations in the case of bit off bottom [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

A Sensing and Computational Framework for Estimating the Seismic Velocities of Rocks Interacting With the Drill Bit

Auriol

Kazemi

Shor

et al. 2020

IEEE Trans. Geosci. Remote Sensing

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We have developed a sensing and computational framework to estimate seismic velocities of rocks interacting with the drill-bit during the drilling process. The performance of drilling depends on our knowledge of the subsurface. The interaction between the drill-bit and rock can introduce severe vibrations in the drill-string and result in safety and performance issues. However, we can use seismic waves radiated from drill-bit-rock interactions to determine seismic velocities of the rocks interacting with the drill-bit. Our approach consists of a distributed (wave equation) representation of the dynamics of the drill-string for which we show (using Riemann's invariants and a backstepping approach) that it is possible to express the force-on-bit as a function of the top-drive force and the topdrive velocity, without requiring explicit information about the subsurface properties. We also show that seismic waves generated by drill-bit-rock interaction can be modelled as functions of the force-on-bit and of rock velocities. The rock velocity independent formulation of the force-on-bit, along with modelling of the seismic waves generated by drill-bit-rock interaction as a function of force-on-bit and rock velocities allow us to estimate seismic velocities of rocks interacting with the drill-bit. We use the alternating minimization algorithm to estimate the velocities. Numerical examples on simulated data are indicators of the validity of the approach. The proposed methodology is the first step towards a subsurface-aware drilling system.

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“…Such stick slip can also occur off-bottom, and does not require a velocity weakening in the bit-rock interaction. Off-bottom stick slip is a well known phenomenon from the field, and when mentioned in literature is hypothesized to be caused by a negative difference between static and kinetic along-string Coulomb-type friction [8,15,21]. This cause is distinct [4] from stick-slip caused by the regenerative effect in the bit-rock interaction [6,11,18].…”

Section: Introductionmentioning

confidence: 99%

Estimating friction factors while drilling

Aarsnes

Auriol

Meglio

et al. 2019

Journal of Petroleum Science and Engineering

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We design and test an algorithm for estimating the bit angular velocity and side forces on a drill string using only topside measurements fed into an adaptive observer. To derive the algorithm gains the drill string is modeled as a distributed wave equation coupled with Ordinary Differential Equations (ODEs) at the boundaries which represent the lumped dynamics of the top-drive and BHA, respectively. Here, the algorithm uses only measurements from the top-drive, while the non-linear side-forces are lumped at the BHA. The obtained observer gains are then implemented on a previously validated torsional drill string model with a distributed BHA model and distributed Coulomb side forces implemented as an inclusion. This design approach combines a high fidelity model with recent theoretical developments on estimation of PDEs to find appropriate feedback gains to ensure a fast and robust tuning. The feasibility of the approach is illustrated by showing convergence in estimated friction factors to the true values when testing on simulated data. When testing on full scale field data, friction factors converge to the same value for different initial values which indicates both good estimates and a robustness of the approach. The estimates produced by the algorithm can be displayed to a driller in real time in an advisory system, and the result can be built on to help optimize the drilling operation, detect faults and unwanted incidents, aid on-site decision making, and improve control of directional drilling.

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Abnormal down hole pressure variation by axial stick-slip of drillstring

Cited by 26 publications

References 10 publications

Development of torque clutch drilling tool and evaluation of drag reduction performance

Development of torque clutch drilling tool and evaluation of drag reduction performance

A Sensing and Computational Framework for Estimating the Seismic Velocities of Rocks Interacting With the Drill Bit

Estimating friction factors while drilling

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