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Research Papers: Petroleum Engineering

Experimental Investigation of the Effect of Shale Anisotropy Orientation on the Main Drilling Parameters Influencing Oriented Drilling Performance in Shale

[+] Author and Article Information
A. N. Abugharara

Department of Process Engineering,
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John’s, NL, A1B3X5, Canada
email: a_nasar@mun.ca

Bashir Mohamed

Department of Process Engineering,
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John’s, NL, A1B3X5, Canada
e-mail: bsim26@mun.ca

C. Hurich

Faculty of Science—Earth Sciences,
Memorial University of Newfoundland,
St. John’s, NL, A1B3X5, Canada
email: churich@mun.ca

J. Molgaard

Department of Mechanical Engineering,
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John’s, NL, A1B3X5, Canada
e-mail: jmolgaard@mun.ca

S. D. Butt

Department of Process Engineering,
Faculty of Engineering and Applied Science,
Memorial University of Newfoundland,
St. John’s, NL, A1B3X5, Canada
e-mail: sdbutt@mun.ca

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received May 26, 2018; final manuscript received April 7, 2019; published online April 22, 2019. Assoc. Editor: Fanhua Zeng.

J. Energy Resour. Technol 141(10), 102904 (Apr 22, 2019) (8 pages) Paper No: JERT-18-1381; doi: 10.1115/1.4043435 History: Received May 26, 2018; Accepted April 07, 2019

The influence of shale anisotropy and orientation on shale drilling performance was studied with an instrumented laboratory drilling rig with a 38.1-mm dual-cutter polycrystalline diamond compact (PDC) bit, operating at a nominally fixed rotational speed with a constant rate of flow of drilling fluid—water. However, the rate of rotation (rpm) was affected by the weight on bit (WOB), as was the torque (TRQ) produced. The WOB also affected the depth of cut (DOC). All these variables, WOB, rpm, TRQ, and DOC, were monitored dynamically, for example, rpm with a resolution of one-third of a revolution (samples at time intervals of 0.07 s.) The shale studied was from Newfoundland and was compared with similar tests on granite, also from a local site. Similar tests were also conducted on the concrete made with fine aggregate, used as “rock-like material” (RLM). The shale samples were embedded (laterally confined) in the concrete while drilled in directions perpendicular, parallel, and at 45 deg orientations to bedding planes. Cores were produced from all three materials in several directions for the determination of oriented physical properties derived from ultrasonic testing and oriented unconfined compressive strength (OUCS). In the case of shale, directions were set relative to the bedding. In this study, both primary (or compression) velocity Vp and shear ultrasonic velocity Vs were found to vary with orientation on the local shale samples cored parallel to bedding planes, while Vp and Vs varied, but only slightly, with orientation in tests on granite and RLM. The OUCS data for shale, published elsewhere, support the OUCS theory of this work. The OUCS is high perpendicular and parallel to shale bedding, and is low oblique to shale bedding. Correlations were found between the test parameters determined from the drilling tests on local shale. As expected, ROP, DOC, and TRQ increase with increasing WOB, while there are inverse relationships between ROP, DOC, and TRQ with rpm on the other hand. All these parameters vary with orientation to the bedding plane.

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Figures

Grahic Jump Location
Fig. 1

(a) Procedure of shale-oriented physical measurement, (b) procedure of RLM and shale-oriented strength measurement, and (c) procedure of laboratory shale-oriented drilling representing various field scenarios

Grahic Jump Location
Fig. 2

Procedure of preparing oriented RLM samples for RLM-oriented physical and mechanical measurements

Grahic Jump Location
Fig. 3

(a) Diagram of anisotropic typical “U-Strength” curve and a developed 3-orientation “syncline-strength” curve, (b) literature data of shale OUCS following the 3-orientation “syncline-strength” curve, and (c) relationship between shale strength AVG of literature data in (b) and shale ROP-AVG of this work

Grahic Jump Location
Fig. 4

Circular wave measurements of (a) RLM, (b) granite, and (c and d) shale circular wave measurements in bar and polar data plots

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Fig. 5

Oriented shale ROP at various sets of WOB, (W1:79 kg, W3: 114 kg, W5: 131 kg, W7: 148 kg, W9: 165 kg)

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Fig. 6

As a function of orientation at various sets of WOB with their average values: (a) ROP, (b) DOC, (c) rpm, and (d) torque

Grahic Jump Location
Fig. 7

(a)–(c) Average ROP with DOC, torque, and rpm of shale drilling as a function of shale bedding orientation, respectively. (d)–(f) Average ROP with DOC, torque, and rpm of RLM drilling as a function of RLM orientation, respectively

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