Rotary Steerable System Design Optimisation with Roller Reamers Prevents Stuck Pipe Events

2021 ◽  
Author(s):  
Anurag Yadav ◽  
Omar Abdelazeem ◽  
Mohamed Chebab ◽  
Atef Shata ◽  
Ahmad Al-Othman ◽  
...  
Keyword(s):  
Best Practices ◽  
Drill String ◽  
Elevated Risk ◽  
Contact Forces ◽  
Operating Efficiency ◽  
Mechanical Instability ◽  
Gas Industry ◽  
Outstanding Achievement ◽  
Root Cause ◽  
Contact Points

Abstract An increasing deployment of rotary steerable system to drill through complex reservoirs demands considerable gains in operating efficiency. It is a known fact that one of the main drilling challenges faced by oil & gas industry is stuck pipe. The risk of stuck pipe is particularly elevated when using a rotary steerable system tool to drill through formations having geo-mechanical instability and alternating hard-soft interbedded layers. This elevated risk is due to the pivot stabilizers, typically used on such tools which have a limited flow by-pass area and high side loads at the contact points with formation. This study showcases how in geo-mechanically unstable formations, a stabilizer in a rotary steerable system tool can be replaced with a roller reamer technology to reduce stuck pipe events while still delivering steerability objectives. Roller reamers are known to deliver reduced contact forces and torque. The analysis focuses on how roller reamer technology was used to prevent rotary stalling of a drill string while drilling, which inadvertently had been a root cause in most stuck events. It also describes how BHA was optimized to achieve directional objective. Further, it discusses how drilling execution and monitoring procedures were modified to ensure stuck pipe is avoided without compromising directional yield of the BHA. Results are presented from actual wells, demonstrating an outstanding achievement of no stuck events on 4 back to back wells after multiple incidents of stuck pipe and lost in hole on previous wells. The best practices followed to ensure safe drilling are explored to highlight roles played by roller reamer replacement of pivot stabilizer in rotary steerable system tool, BHA optimization and real time drilling monitoring. Results prove that an engineered application of proper BHA design and effective drilling execution & monitoring can deliver efficient operations, even in most complex drilling environments.

scholarly journals Slipping–rolling transitions of a body with two contact points

2021 ◽  
Author(s):  
Mate Antali ◽  
Gabor Stepan
Keyword(s):  
Rigid Body ◽  
Contact Point ◽  
Static Friction ◽  
Rigid Body Dynamics ◽  
Contact Forces ◽  
Friction Forces ◽  
Contact Points ◽  
Body Dynamics ◽  
Coulomb Model ◽  
Rigid Surfaces

AbstractIn this paper, the general kinematics and dynamics of a rigid body is analysed, which is in contact with two rigid surfaces in the presence of dry friction. Due to the rolling or slipping state at each contact point, four kinematic scenarios occur. In the two-point rolling case, the contact forces are undetermined; consequently, the condition of the static friction forces cannot be checked from the Coulomb model to decide whether two-point rolling is possible. However, this issue can be resolved within the scope of rigid body dynamics by analysing the nonsmooth vector field of the system at the possible transitions between slipping and rolling. Based on the concept of limit directions of codimension-2 discontinuities, a method is presented to determine the conditions when the two-point rolling is realizable without slipping.

Periodic Response of a Link Coupling With Clearance

1989 ◽  
Vol 111 (2) ◽  
pp. 253-259 ◽  
Author(s):  
Y. S. Choi ◽  
S. T. Noah
Keyword(s):  
Steady State ◽  
Boundary Conditions ◽  
Solution Procedure ◽  
Contact Forces ◽  
Steady State Response ◽  
Algebraic Equations ◽  
State Response ◽  
Contact Points ◽  
Integration Schemes ◽  
Nonlinear Algebraic Equations

The nonlinear, steady-state response of a displacement-forced link coupling with clearance with finite stiffness is determined. The solution procedure is derived from satisfying the boundary conditions at the contact points and then solving the resulting nonlinear algebraic equations by setting the duration of contact as a parameter. This direct approach to determining periodic solutions for systems with clearances with finite stiffness is substantially more efficient than numerical integration schemes. Results in terms of contact forces and durations of contact are pertinent to fatigue and wear studies. Parametric relations are presented for effects of the variation of damping, stiffness, exciting displacement, and gap length on the dynamic behavior of the link pair.

Estimation of Graphite Dust Production in a Pebble-Bed Type Nuclear Reflector

2014 ◽  
Author(s):  
Ji-Ho Kang ◽  
Eung Seon Kim ◽  
Seungyon Cho
Keyword(s):  
Adhesive Wear ◽  
Cell Model ◽  
Estimation Method ◽  
Unit Cell ◽  
Contact Forces ◽  
Dust Explosion ◽  
Dust Production ◽  
Pebble Bed ◽  
Normal Contact ◽  
Contact Points

In this study, an estimation method of graphite dust production in the pebble-bed type reflector region of Korean HCSB (Helium-Cooled Solid Breeder) TBM (Test Blanket Module) in the ITER (International Thermonuclear Experimental Reactor) project using FEM (Finite Element Method) was proposed and the amount of dust production was calculated. A unit-cell model of uniformly arranged pebbles was defined with appropriate thermal and mechanical loadings. A commercial FEM program, Abaqus V6.10 was used to model and solve the stress field under multiple contact constraints between pebbles in the unit-cell. Resulting normal contact forces and slip distances on contact points were applied into the Archard adhesive wear equation to calculate the amount of graphite dust. The friction effect on contact points was investigated. The calculation result showed that the amount of graphite dust production was estimated to 2.22∼3.67e−4 g/m3 which was almost linearly proportional to the friction coefficient. The analysis results will be used as the basis data for the consecutive study of dust explosion.

scholarly journals Repeatability Analysis of Overconstrained Kinematic Coupling Using a Parallel-Mechanism-Equivalent Model

2020 ◽  
Author(s):  
Jianzhong Ding ◽  
Xueao Liu ◽  
chunjie wang
Keyword(s):  
Parallel Mechanism ◽  
Sampling Method ◽  
Contact Forces ◽  
Equivalent Model ◽  
Parallel Mechanisms ◽  
Kinematic Coupling ◽  
Contact Points ◽  
Prismatic Joints ◽  
Type Coupling ◽  
Additional Support

Abstract A novel method for repeatability analysis of overconstrained kinematic coupling using a parallel-mechanism-equivalent-model is proposed. An overconstrained Kelvin-type coupling with one additional support is introduced and used for method illustration. Contact forces of the overconstrained coupling under preload are computed with Moore-Penrose inverse and the deformations are obtained using the Hertz theory. The couping is equivalently modeled as a 7-SPS parallel mechanism, spherical joints of which represent the centers of the supporting balls and the contact points, respectively, and prismatic joints are used to simulate the deformations. Therefore, pose error of the coupling arisen from preload is analyzed using the well-appraised incremental method for forward kinematics analysis of parallel mechanisms. The uncertainties of the preload are discussed and a boundary-sampling method is proposed for repeatability analysis. The main contribution of this study lies in that the proposed parallel-mechanism-equivalent-model and the boundary-sampling method greatly simplify the repeatability analysis of overconstrained kinematic couplings. Finally, the proposed methods are validated by case study.

Calculation of Contact Forces of Large-Scale Heavy Forging Manipulator Grippers

2009 ◽  
Vol 419-420 ◽  
pp. 645-648 ◽  
Author(s):  
Qun Ming Li ◽  
Dan Gao ◽  
Hua Deng
Keyword(s):  
Large Scale ◽  
Optimization Method ◽  
Contact Forces ◽  
Robotic Hand ◽  
Closure Condition ◽  
Contact Points ◽  
Robot Hands ◽  
Calculation Results ◽  
Forging Manipulator ◽  
Gripping Force

Different from dexterous robotic hands, the gripper of heavy forging manipulator is an underconstrained mechanism whose tongs are free in a small wiggling range. However, for both a dexterous robotic hand and a heavy gripper, the force closure condition: the force and the torque equilibrium, must be satisfied without exception to maintain the grasping/gripping stability. This paper presents a gripping model for the heavy forging gripper with equivalent friction points, which is similar to a grasp model of multifingered robot hands including four contact points. A gripping force optimization method is proposed for the calculation of contact forces between gripper tongs and forged object. The comparison between the calculation results and the experimental results demonstrates the effectiveness of the proposed calculation method.

The Root Cause Analysis and Successful Control of an Oilwell Blowout in the Middle East

2021 ◽  
Author(s):  
Rahman Ashena ◽  
Farzad Ghorbani ◽  
Muhammad Mubashir ◽  
Mahdi Nazari Sarem ◽  
Amin Iravani
Keyword(s):  
Adverse Effect ◽  
Middle East ◽  
Inclination Angle ◽  
Drill String ◽  
Control Methods ◽  
Well Drilling ◽  
Causal Factors ◽  
Cause Analysis ◽  
Root Cause ◽  
Successful Control

Abstract In 2017, a blowout and explosion occurred in a drilling oilwell in the Middle East. After drilling to the depth of 2,610 m, tripping was decided in order to change the bit. When the crew were pulling the drill string out of the hole with the drill-string being at the depth of 1332 m, blowout and explosion occurred. The well was a development well drilling almost horizontally (82 degrees inclination angle) into a highly-pressured gas-cap and oil pay-zone of the oilfield. In this work, following a brief explanation of the root causal factors of the incident, we give an account of the blowout control methods applied to put an end to the blowout. Both the top-kill method and the bottom-kill method by relief well drilling, were simultaneously implemented to control the blowout. Finally, the blowout was successfully controlled by the bottom-kill after 58 days. During top-kill operations, all equipment was cleared away and this contributed to proceeding to permanent abandonment immediately after the relief well success. Finally, the adverse effect of the blowout on the environment (HSE) was qualitatively discussed.

Modeling of a Finger-Follower Cam System With Verification in Contact Forces

1993 ◽  
Author(s):  
Wensyang Hsu ◽  
Albert P. Pisano
Keyword(s):  
Constraint Equation ◽  
Contact Forces ◽  
Valve Train ◽  
Dynamic Responses ◽  
Valve Lift ◽  
Distributed Parameter ◽  
Contact Points ◽  
Frictional Forces ◽  
Contact Position ◽  
Force Data

Abstract A lumped/distributed-parameter, dynamic model is developed to investigate the dynamic responses of a finger-follower valve train with the effects of an oscillating pivot, frictional forces between sliding surfaces, and a hydraulic lash adjuster. Based on the measured force data at low speed, an algorithm is derived to determine the dynamic Coulomb friction coefficients around maximum valve lift simultaneously at three contact points. A constraint equation is formulated to find the contact position between the cam and the follower kinematically. This makes it possible for the model to simulate the dynamic response of the cam system when the pivot is moving. A hydraulic lash adjuster acting as the pivot of the follower is also modeled with the effects of oil compressibility and oil refill mechanism. The model is numerically integrated and shown to have good agreement between simulation results and experimental data of contact forces at three different speeds. The maximum operating speed is limited by valve toss, loss contact between components. The model predicts toss between the hydraulic lash adjuster and the follower at 2535 rpm, and experiment indicates toss starting at 2520 rpm of camshaft speed.

Case Histories of the Resolution of Bolted Joint Leakage in the Oil and Gas Industry

2016 ◽  
Author(s):  
Warren Brown ◽  
Geoff Evans ◽  
Lorna Carpenter
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Lessons Learned ◽  
Bolted Joint ◽  
Case Histories ◽  
Gas Industry ◽  
Root Cause ◽  
The Past ◽  
Cause Of Failure ◽  
Assessment Techniques

Over the course of the past 20 years, methods have been developed for assessing the probability and root cause of bolted joint leakage based on sound engineering assessment techniques. Those methods were incorporated, in part, into ASME PCC-1-2010 Appendix O [7] and provide the only published standard method for establishing bolted joint assembly bolt load. As detailed in previous papers, the method can also be used for troubleshooting joint leakage. This paper addresses a series of actual joint leakage cases, outlines the analysis performed to determine root cause of failure and the actions taken to successfully eliminate future incidents of failure (lessons learned).

How to avoid aches and pains in your joint ventures

2016 ◽  
Vol 56 (2) ◽  
pp. 559
Author(s):  
Brent Steedman
Keyword(s):  
Joint Ventures ◽  
Joint Venture ◽  
Oil And Gas ◽  
Cost Savings ◽  
Oil And Gas Industry ◽  
Capital Allocation ◽  
Operating Efficiency ◽  
Global Business ◽  
Gas Industry ◽  
The Right

The Australian oil and gas industry is in a period of substantial challenges, including a significant decline in oil prices, fluctuating spot gas prices, a relentless drive for operating efficiency, and tight capital allocation, together with increased regulatory scrutiny and a reputation for below-standards productivity. On the upside, these market challenges provide significant opportunities for companies to bring in new investors, implement new operating models, apply innovation to update processes and practices, and restructure activities. Making material step-changes, requires companies to review, amend, and update joint venture operating agreements (JVOAs). KPMG has worked with many of Australia’s leading oil and gas companies on a range of joint venture engagements. This extended abstract outlines why JVOAs need to be reviewed with respect to the following key opportunities and challenges: Fast-changing global business operating models. Available cost savings by eliminating inconsistent management and operating models between joint ventures. Planning for potential restructuring, including separation of infrastructure (e.g. plants, pipelines, support) from reserve ownership. Sharing of services (e.g. maintenance and logistics) between unrelated joint ventures. Transparency of costs and asset performance. Improved joint venture governance (not more or over-governance) between participants to attract investment. Effective resourcing, noting the right transition of capabilities between deal-makers and joint venture operators. With this extended abstract the authors aim to provide ideas for consideration. Each of these ideas will impact JVOAs. The authors’ proposition is that now is the right time to complete a comprehensive review of JVOAs to enable organisations to move fast as new and innovative opportunities arise.

Decommissioning: taking control of your committed investment

2018 ◽  
Vol 58 (2) ◽  
pp. 739 ◽  
Author(s):  
Robin Polson
Keyword(s):  
Best Practices ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Board Members ◽  
Window Of Opportunity ◽  
Australian Government ◽  
Community Groups ◽  
Gas Industry ◽  
Challenges And Opportunities ◽  
Oil And Gas Companies

At the APPEA 2017 Conference in Perth, Bernadette Cullinane and Susan Gourvenec drew our attention to the looming challenge for Australia’s oil and gas industry in decommissioning its aging assets (Cullinane and Gourvenec 2017). While Cullinane and Gourvenec’s paper focussed on the experience challenge for the Australian industry, this paper will drill down to explore the funding and financial challenges and opportunities for decommissioning in the decades ahead. In approaching the decommissioning of their assets, oil and gas companies must consider a broad range of stakeholders, beyond their immediate shareholders and board members. As we have seen in the development of new projects, Australian Government, environmental organisations and community groups, all have increasingly significant impact. These stakeholders have been considered and managed with (at best) varying degrees of effectiveness in the recent past. This impact will continue to grow for decommissioning of existing assets. However, right now, with few decommissioning projects in play, the industry has a limited window of opportunity to set the agenda for how, when and under what kind of funding arrangements and financial structures decommissioning can take place. By getting ahead of the game and establishing best practices from the outset, the industry can demonstrate to Australian Government, environmental organisations and community groups a level of commitment and accountability that will allow us to move ahead on decommissioning, with reduced outside interference. The window of opportunity is closing. The time to act is now.

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