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You searched for subject:(rock geomechanical properties). Showing records 1 – 2 of 2 total matches.

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The Ohio State University

1. Gong, Yiwen. Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives.

Degree: PhD, Chemical Engineering, 2020, The Ohio State University

The advancements of hydraulic fracturing techniques ensure the improved fracture surface areas that are open to fluids flow. The induced microcracks accelerate the fluid communications between fractures and the fracture adjacent rock matrix at fracture surface. In brittle rocks, the generated fracture network puzzles engineers since the induced hydraulic fractures and activated pre-existing fractures challenge the stimulated reservoir volume (SRV) characterizations. Furthermore, the necessary engineered justifications of each stage due to lateral heterogeneity of the reservoir and the stress shadow effect (in-situ stress increase along the wellbore) even introduce another level of complexity of the effective fracture drainage complexity. Simultaneous fracture growth becomes difficult, resulting in variations of fracture half lengths, within a stage, and among stages. The failure planes of the rock, from mode I, mode II and the combination of them, are not smooth and parallel; instead, they are usually associated with certain surface roughness and non-planar morphology, which in turn inhibit the ideal Poiseuille flow in the fracture. As a result, the fundamental studies of non-planar and rough complex fracture paths to the proppant transport are essentially inevitable.To gain better understanding of the fracture network and the geomechanical aspects that form the complex fracture network, the objective of this work is firstly to quantitatively measure the rock damage from the induced microcracks at the adjacent matrix of the hydraulic fracture; we will then investigate the rock geomechanical properties which essentially dominant the fracture generation using machine learning approaches with cross-disciplinary data sources, including well logs, petrophysical properties, and rock microstructures information. Lastly, we will probe proppant transport characteristics in bifurcated fracture system. To achieve the aforementioned adjectives, this dissertation is structured into two major parts: the microstructure diagnosis of fractured tight rocks and geomechanical rock property estimations beyond the traditional approach as the first part and the proppant transport considering the induced microfracture/bifurcated fractures as the second part. To be more specific, the microstructure analysis is achieved by SEM image analysis while the geomechanical study is conducted optimizing the data usage from machine learning techniques. The second major part is to build the complex fracture network modeling by including non-planarity, and secondary fractures and tertiary fractures in the computational fluid dynamics modeling frame (Eulerian-Eulerian) in the field scale as well as computational fluid dynamics – discrete element method coupling frame (Eulerian- Lagrangian) in the flow-unit scale, respectively. The proppant transport loss passing the bifurcated fractures are evaluated. Advisors/Committee Members: El-Monier, Ilham (Advisor), Tomasko, David (Committee Co-Chair).

Subjects/Keywords: Chemical Engineering; Petroleum Engineering; Proppant transport; machine learning; rock geomechanical properties; CFD; CFD-DEM

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APA (6th Edition):

Gong, Y. (2020). Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1605633687308252

Chicago Manual of Style (16th Edition):

Gong, Yiwen. “Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives.” 2020. Doctoral Dissertation, The Ohio State University. Accessed April 12, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1605633687308252.

MLA Handbook (7th Edition):

Gong, Yiwen. “Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives.” 2020. Web. 12 Apr 2021.

Vancouver:

Gong Y. Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives. [Internet] [Doctoral dissertation]. The Ohio State University; 2020. [cited 2021 Apr 12]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1605633687308252.

Council of Science Editors:

Gong Y. Toward Better Understandings of Unconventional Reservoirs - Rock Mechanical Properties and Hydraulic Fracture Perspectives. [Doctoral Dissertation]. The Ohio State University; 2020. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1605633687308252


Missouri University of Science and Technology

2. Abbas, Ahmed Khudhair. An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq.

Degree: PhD, Petroleum Engineering, Missouri University of Science and Technology

”The Zubair Formation is the most prolific reservoir in Iraq, which is comprised of sandstones interbedded with shale sequences. Due to the weak nature of the shale sequence, the instability of a wellbore is one of the most critical challenges that continuously appears during drilling across this formation. Historically, over 90% of wellbore problems in the Zubair Formation were due to wellbore instability. Problems associated with wellbore instability, such as tight hole, shale caving, stuck logging tools along with subsequent fishing, stuck pipe, and sidetracking result in increasing the non-productive time. This non-productive time has cost an enormous amount of money. The main objective of this research is to reduce the drilling time and cost for 8 ½” phase of wells in Zubair Formation by minimizing wellbore stability problems. This will be achieved by different laboratory tests on core samples from the targeted formation to obtain the rock mechanical properties and by applying a geomechanical model based on offset well data coupled with suitable rock failure criteria to obtain a safe mud weight and an appropriate well trajectory. Furthermore, this project presents some of the primary laboratory and wellsite testing techniques that are often used by mud engineers to characterize and remediate drilling fluids and shale interactions to improve the selection of chemical additives for clay inhibit. The present research work can be applied as a cost-effective tool to assess and address existing wellbore instability problems and to guide future neighboring wells for better drilling efficiency by reducing the non-productive time and well costs” – Abstract, page iv.

Subjects/Keywords: Clay Inhibit; Geomechanical Model; Rock Mechanical Properties; Safe Mud Weight; Wellbore Instability; Geological Engineering; Geology; Petroleum Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Abbas, A. K. (n.d.). An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq. (Doctoral Dissertation). Missouri University of Science and Technology. Retrieved from https://scholarsmine.mst.edu/doctoral_dissertations/2904

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Chicago Manual of Style (16th Edition):

Abbas, Ahmed Khudhair. “An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq.” Doctoral Dissertation, Missouri University of Science and Technology. Accessed April 12, 2021. https://scholarsmine.mst.edu/doctoral_dissertations/2904.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7th Edition):

Abbas, Ahmed Khudhair. “An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq.” Web. 12 Apr 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Abbas AK. An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq. [Internet] [Doctoral dissertation]. Missouri University of Science and Technology; [cited 2021 Apr 12]. Available from: https://scholarsmine.mst.edu/doctoral_dissertations/2904.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Abbas AK. An integrated wellbore stability study to mitigate expensive wellbore instability problems while drilling into Zubair shale/sand sequence, southern Iraq. [Doctoral Dissertation]. Missouri University of Science and Technology; Available from: https://scholarsmine.mst.edu/doctoral_dissertations/2904

Note: this citation may be lacking information needed for this citation format:
No year of publication.

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