Development of the Industry's First Slimhole Point-the-Bit Rotary Steerable System

Stroud, Daryl; Russell, M.K.; Peach, Simon

doi:10.2118/84449-ms

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…The roller cartridge locking mechanism es (cusps) to focus the locking forces cale horizontal drilling rig (as described by Stroud et al, 2003) that enables utilizes two opposing tapered conical wedg along the body of the tool. This allows a narrower pocket, for increased flow-by area and creates high locking forces that ensure roller retention.…”

Section: Figure 1: Rss Overview and Basic Tool Operationmentioning

confidence: 99%

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Roller Reamer Fulcrum in Point-The-Bit Rotary Steerable System Reduces Stick-Slip and Backward Whirl

Stroud

Bird

Norton

et al. 2012

IADC/SPE Drilling Conference and Exhibition

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An increasing proportion of wells are drilled using RSS, whose BHA dynamic behaviour is very different to that of steerable mud motors. This return to rotary drilling has renewed industry interest in detrimental dynamic phenomena such as backward whirl . Preventing these undesirable dynamics is crucial to drilling efficiency and it is widely recognised that the nature of BHA/borehole contact points plays a key role in preventing backward whirl. Side-loads applied to stabilizers by the RSS for the means of controlling the trajectory of the wellbore can increase traction with the well bore. Although these borehole contact points are designed to be low friction; even a well engineered sliding contact surface can never be as effective as a rolling bearing element in preventing traction.The use of roller reamers in BHAs to prevent stick-slip being generated at contact points under high side-load is well known. In addition, Sowers et al (2009) pointed out how backward whirl creates high side-forces at borehole contact points leading to stick-slip and proved that replacing stabilizers with roller reamers can be an effective method of decoupling BHA whirl and stabilizer torque. They also speculated that roller reamers are more effective at smoothing out borehole features created by whirl. In addition, roller reamers are field proven technology and could potentially gain rapid widespread acceptance.This investigation focuses on how roller reamer technology can be adapted for use as a key component in a rotary steering assembly to prevent borehole traction WITHOUT causing side-cutting and hole enlargement, and without adversely affecting system steerability. It describes how a custom design roller reamer can be used to replace a stabilizer as the fulcrum for a point-the-bit rotary steerable system (RSS).Results of laboratory and field test programs are presented, showing a dramatic reduction in dysfunctional drilling conditions caused by traction between the fulcrum stabilizer and borehole. Full scale laboratory testing explores the impact of custom design and strategically placed rolling contact elements in a point-the-bit RSS. Results confirm that rolling contact elements are effective at preventing backward whirl at borehole contact points.

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Section: Figure 1: Rss Overview and Basic Tool Operationmentioning

confidence: 99%

“…This paper focuses on the development and testing of one of the latest generation point-the-bit RSS (Stroud et al, 2003). The RSS comprises three main elements; downhole electronic control module, mechanical bias unit and pivot stabilizer (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Roller Reamer Fulcrum in Point-The-Bit Rotary Steerable System Reduces Stick-Slip and Backward Whirl

Stroud

Bird

Norton

et al. 2012

IADC/SPE Drilling Conference and Exhibition

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“…Laboratory tests performed using a full-scale horizontal drilling rig (as described by Stroud et al, 2003) that enables drilling of 80ft long concrete blocks filled with various aggregate to simulate different formation types. This facility (as shown in Figure 9) gives the unique opportunity to iteratively increase bit gauge length whilst keeping all other parameters constant.…”

Section: Description and Application Of Equipment And Processesmentioning

confidence: 99%

Exploration of the Interaction Between Drill Bit Gauge Profile and Point-The-Bit Rotary Steerable Systems

2011

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This paper describes an investigation of bit passive gauge profiles for a latest generation point-the-bit Rotary Steerable System (RSS) shown in Figure 1. Using theoretical analyses, a methodology has been developed for exploiting lateral stability afforded by extended passive gauge, without limiting steerability or creating stick-slip or high torque. Results of laboratory testing and field studies are presented, showing a step-change improvement in drilling performance and efficiency. Figure 1: Schematic diagram of a point-the-bit rotary steerable systemFull scale laboratory testing and field studies explore the impact of extended passive gauge in maintaining lateral stability. Results show that typically much longer passive gauge length than is common can be applied without adversely affecting steerability or stick-slip. These practical results are fully explained by theoretical analyses that predict critical gauge lengths. The optimum gauge profile is shown to be dependent on hole size and formation type.

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“…To overcome theshortcoming of point-the-bit 4,5 and push-the-bit improve the quality of bore hole, a novel structure of rotary steerable drilling tool which used a universal joint 6 as a connection to the rotating mandrel and offset mandrel is presented in this paper. Our new designed drilling tool uses a universal joint to avoid producing alternating stress produced by the increasing ultimate displacement 7 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a New Rotary Steerable Drilling Tool

Wang

Niu

et al. 2012

AMM

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This paper presents a novel Rotary Steerable System which used a universal joint to avoid the alternating press in the drilling process. The mechanics model is established on the basis of simplifying structure and supporting of rotation axis in directive RSS. Dynamic model of the offset mandrel is derived by means of Hamilton principle, which could be used to control system design. Location of offset force acting on the offset mandrel is optimized and vibration equation of universal joint is deduced by means of transfer matrix method, then the results of natural frequency are compared with the calculated results of the finite element to verify the kinetic model. Both dynamic model and simulation analysis are expected to provide useful good guidance for the design of control system, detail design, structure optimization and the dynamic vibration of the RSS.

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Development of the Industry's First Slimhole Point-the-Bit Rotary Steerable System

Cited by 15 publications

References 2 publications

Roller Reamer Fulcrum in Point-The-Bit Rotary Steerable System Reduces Stick-Slip and Backward Whirl

Roller Reamer Fulcrum in Point-The-Bit Rotary Steerable System Reduces Stick-Slip and Backward Whirl

Exploration of the Interaction Between Drill Bit Gauge Profile and Point-The-Bit Rotary Steerable Systems

Dynamic Analysis of a New Rotary Steerable Drilling Tool

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