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Research Papers: Petroleum Engineering

Investigating the Relation Between Sorption Tendency and Hydraulic Properties of Shale Formations

[+] Author and Article Information
Vahid Dokhani

YU Technologies, Inc.,
7633 E. 63rd Pl. STE 245,
Tulsa, OK 74133
e-mail: Vahid-dokhani@yutechnologies.com

Mengjiao Yu

McDougall School of Petroleum Engineering,
University of Tulsa,
2450 East Marshall Street,
Tulsa, OK 74104
e-mail: Mengjiao-yu@utulsa.edu

Chao Gao

McDougall School of Petroleum Engineering,
University of Tulsa,
2450 East Marshall Street,
Tulsa, OK 74104
e-mails: Chao-gao@utulsa.edu; Gaochaoseu@gmail.com

James Bloys

Chevron Corporation,
1400 Smith Street,
Houston, TX 77002
e-mail: Ben.bloys@chevron.com

1Present address: Petroleum and Geosystems Engineering Department, University of Texas at Austin, 200 E. Dean Keeton, Austin, TX 78712.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 21, 2016; final manuscript received July 6, 2017; published online August 22, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(1), 012902 (Aug 22, 2017) (9 pages) Paper No: JERT-16-1035; doi: 10.1115/1.4037480 History: Received January 21, 2016; Revised July 06, 2017

Routine measurement of hydraulic diffusivity of ultralow permeability rocks, such as shale, is a prolonged process. This study explores the effects of a sorptive characteristic of the porous medium on hydraulic diffusivities of shale rocks. The examined rock types include Mancos Shale, Catoosa Shale, Eagle Ford Shale, and core samples from the Gulf of Mexico. First, the adsorption isotherms of the selected shale rocks were obtained. Then, the hydraulic properties of the selected shale rocks were determined using Shale/Fluid Interaction Testing Cell, which employs pore pressure transmission technique. The experimental results show that the moisture content of shale is correlated with water activity using a multilayer adsorption theory. It is found that the adsorption isotherms of various shale formations can be scaled using their respective cation exchange capacity (CEC) into a single adsorption curve. Analyzing the transient pore pressure response in the downstream side of shale sample allows calculating the transport coefficients of shale samples. Hydraulic properties of shales are obtained by matching the pore pressure history with one-dimensional coupled fluid flow model. The experimental results indicate that sorptive properties can be inversely related to the hydraulic diffusivity of shale rocks. It is found that with an increase in the magnitude of sorption potential of shale, the hydraulic diffusivity decreases. This study is useful for shale characterization and provides a correlation, which can have various applications including, but not limited to, wellbore stability prediction during well planning.

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Topics: Pressure , Sorption , Rocks , Shales , Fluids
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Figures

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Fig. 1

Schematic of experimental setup of SFITC

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Fig. 2

Sorption isotherms of several shale formations

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Fig. 3

CEC-normalized sorption isotherm for different shale formations

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Fig. 4

Pore pressure response of Mancos Shale (MSP#1) using distilled water

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Fig. 5

Pore pressure response of Mancos Shale (MSP#14) tested with mud filtrate

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Fig. 6

Pore pressure response of Mancos Shale (MSP#24) tested with a solution of 1% w/w KCl

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Fig. 7

Pore pressure response of Mancos Shale (MSP#35) tested with a solution of 1% w/w CaCl2

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Fig. 8

Pore pressure response of Mancos Shale (MSP#37) tested with a solution of 2% w/w KCl

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Fig. 9

Comparison of experimental and modeling results of Catoosa Shale sample tested with 1% w/w KCl

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Fig. 10

Comparison of experimental and modeling results of GOM Shale sample tested with 10% w/w KCl

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Fig. 11

Comparison of experimental and modeling results of Eagle Ford Shale sample tested with 3% w/w KCl

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Fig. 12

Comparing the hydraulic diffusivity and monolayer moisture content of the selected shale types

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Fig. 13

Workflow for wellbore stability analysis for shale formations

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