Reduction of Drill String Torque and Casing Wear in Extended Reach Wells Using Non-Rotating Drill Pipe Protectors

Moore, N.B.; Mock, P.W.; Krueger, R.E.

doi:10.2523/35666-ms

Cited by 2 publications

(1 citation statement)

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“…Moore (1) et al has described the development and testing of this technology and has detailed field case studies where such technology was utilized by major operators to achieve torque reductions of 10-30% as well as prevention of casing wear in ERD applications.…”

Section: Introductionmentioning

confidence: 99%

Improved Means of Reducing Drag in ERD Applications

Jardaneh¹

2002

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe increasing number of difficult Extended Reach Drilling (ERD) applications in recent years has emphasized the need for reducing drill string drag. Drill string drag can substantially limit weight on bit and negatively effect directional control.An improved type of drill pipe deployed Non-Rotating Drill Pipe Protector (NRDPP) has been developed that was found, both in laboratory tests and in actual down-hole drilling/sliding applications, to reduce drag inside casing up to 50% of that for bare drill pipe. This new tool incorporates existing NRDPP fluid bearing technology for torque reduction along with a modified geometry and the use of low-friction wear pads to reduce drag. This paper describes the design and testing of the new "Low-Drag" NRDPP and provides a detailed discussion of three different wells that were drilled using this new tool for the purpose of providing drag, torque, and casing wear reduction. The wells, drilled by major oil companies in different regions of the world, were of varying profiles and possessed a unique set of operational circumstances.

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Section: Introductionmentioning

confidence: 99%

Improved Means of Reducing Drag in ERD Applications

Jardaneh¹

2002

All Days

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Improving Hole Cleaning by Using Distributed Damping Subs to Control Lateral Oscillations of the Drill-String

Mihai,

Ambrus,

Cayeux

2024

Day 1 Tue, March 05, 2024

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Poor hole cleaning is often the cause for drilling performance deterioration, many times leading to detrimental situations such as pack-offs and stuck pipe. In addition to high flowrate and rotational speed, lateral oscillations of the drill-string on the low-side of inclined wells were shown to improve hole cleaning. However, the drill-string lateral oscillations are usually not controlled in any way. This paper proposes a solution to trigger the lateral movement of the drill-string at certain positions, with simulation results to support the novel concept. Generally, it is desirable to damp out drill-string vibrations as they impact drilling performance, can cause severe damage to drill-string/bottom hole assembly components, or destabilize the formation rocks. A solution based on distributed damping subs along the drill-string has been proposed to eliminate stick-slip and other forms of torsional vibrations. These damping subs utilize magnetic viscous damping through eddy current braking and their design enables active control of the damping strength. The latter fact allows to consider a coordinated control of the damping strength to initiate a controlled low amplitude lateral movement of the drill-string that can facilitate hole-cleaning while simultaneously attenuating torsional oscillations of the drill-string. A simulated environment was used for verifying the proposed solution. It includes a transient stiff-string torque and drag model which accounts for axial, torsional and lateral displacements. The viscous damping subs are included in the model at defined locations along the drill-string. Several distributed control strategies have been simulated and the induced lateral movement of the drill-string has been analyzed. Simulations were performed with a well configuration from a field case. The first series of simulated experiments were focused on controlling the amount of viscous damping for all subs simultaneously with the same magnitude. It was observed that the effect on the lateral movement in this case was minor. In a second approach, subs placed at different locations had different damping strengths that were varied at specific time steps. Controlling the damping in a distributed fashion had a stronger effect on the local lateral movement and it was possible to create different localized movement patterns along the drill-string. The concept of utilizing distributed damping subs along the drill-string opens the possibility to actively control the local lateral movement of the drill-pipes and therefore enhance hole cleaning performance. At the same time, torsional oscillations are damped out. Furthermore, the damping subs reduce the overall required torque at the top-drive and facilitate weight transmission to the bit.

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Reduction of Drill String Torque and Casing Wear in Extended Reach Wells Using Non-Rotating Drill Pipe Protectors

Cited by 2 publications

References 0 publications

Improved Means of Reducing Drag in ERD Applications

Improved Means of Reducing Drag in ERD Applications

Improving Hole Cleaning by Using Distributed Damping Subs to Control Lateral Oscillations of the Drill-String

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