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Research Papers: Petroleum Engineering

Drag-Reduction and Resonance Problems of a Jointed Drillstring in the Presence of an Axial Excitation Tool

[+] Author and Article Information
Xueying Wang, Lei Zhang, Peng Wang

Research Institute of Unconventional Oil & Gas
and Renewable Energy,
China University of Petroleum,
Qingdao 266580, China

Hongjian Ni

Research Institute of Unconventional Oil & Gas
and Renewable Energy,
China University of Petroleum,
Qingdao 266580, China
e-mail address: nhj_upc@126.com

Ruihe Wang

School of Petroleum Engineering,
China University of Petroleum,
Qingdao 266580, China

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received December 19, 2017; final manuscript received July 20, 2018; published online October 4, 2018. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 141(3), 032904 (Oct 04, 2018) (8 pages) Paper No: JERT-17-1722; doi: 10.1115/1.4041155 History: Received December 19, 2017; Revised July 20, 2018

Axial excitation tools (AETs) have the ability to improve slide-drilling efficiency by reducing the friction between the drillstring and the wellbore wall. However, drag-reduction effects are not always satisfactory, and excessive vibration may cause failures of downhole tools in some cases. Thus, a mathematical model was proposed to simulate the vibration responses of a drillstring. In the model, velocity-dependent friction is adopted to calculate the friction-reduction effect. The effect of drillstring joints on the weight on bit (WOB) was first investigated. The simulation results indicate that the joints intensify the stick-slip motion of the drillstring system. The effect of the location of an AET was then examined. The results show that it is better to place an AET near the drill bit rather than near the rear of a build section. Because the frictional drag acting on the lower portion of the drillstring dominates the axial stick-slip motion of a drill bit. Finally, the resonance responses were examined in terms of the drillstring system acceleration. The results show that resonance moderately increases the accelerations of a long horizontal drillstring system in a heavy-damping environment but that the growth of the exciting force can profoundly increase the accelerations.

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Figures

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Fig. 1

A typical layout of a horizontal well drilled with an AET

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Fig. 2

Common drill pipe without intermediate intensification

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Fig. 3

Horizontal drillstring model: (a) without joints and (b) with joints

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Fig. 4

Finite rigid body model of the drillstring

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Fig. 5

Forces acting on a drillstring segment

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Fig. 6

Flow chart of the solution procedure

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Fig. 7

Contact force and axial force in a horizontal section: (a) with joints and (b) without joints

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Fig. 8

Simulated WOB curves with and without joints

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Fig. 9

Maximum velocity of each segment along the drillstring

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Fig. 10

Well profile of a two-dimensional horizontal well

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Fig. 11

Contact force distribution along the drillstring

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Fig. 12

Weight on bits when AET is placed at a different location

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Fig. 13

Simulated WOB curve at an exciting force of 20 kN and 20 Hz: (a) 0–10 s and (b) 9–10 s

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Fig. 14

Displacement amplitudes along the drillstring at different frequencies

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Fig. 15

The location of an MWD tool in the drillstring

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Fig. 16

Absolute values of accelerations of an MWD tool at an exciting force of 10 kN: (a) 12 Hz and (b) 13 Hz

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Fig. 17

Absolute values of accelerations of an MWD tool at an exciting force of 20 kN: (a) 12 Hz and (b) 13 Hz

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