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Research Papers: Petroleum Engineering

A New Technique to Predict In Situ Stress Increment Due to Biowaste Slurry Injection Into a Sandstone Formation

[+] Author and Article Information
Sherif M. Kholy

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: skholy@advantekinternational.com

Ahmed G. Almetwally

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: agalal@advantekinternational.com

Ibrahim M. Mohamed

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: imohamed@advantekinternational.com

Mehdi Loloi

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: mehdi@advantekinternational.com

Ahmed Abou-Sayed

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: asa@advantekinternational.com

Omar Abou-Sayed

Advantek Waste Management Services,
11000 Richmond Avenue, Suite #190,
Houston, TX 77042
e-mail: omar@advantekinternational.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received February 26, 2018; final manuscript received September 17, 2018; published online October 12, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 140(12), 122905 (Oct 12, 2018) (9 pages) Paper No: JERT-18-1159; doi: 10.1115/1.4041542 History: Received February 26, 2018; Revised September 17, 2018

Underground injection of slurry in cycles with shut-in periods allows fracture closure and pressure dissipation which in turn prevents pressure accumulation and injection pressure increase from batch to batch. However, in many cases, the accumulation of solids on the fracture faces slows down the leak off which can delay the fracture closure up to several days. The objective in this study is to develop a new predictive method to monitor the stress increment evolution when well shut-in time between injection batches is not sufficient to allow fracture closure. The new technique predicts the fracture closure pressure from the instantaneous shut-in pressure (ISIP) and the injection formation petrophysical/mechanical properties including porosity, permeability, overburden stress, formation pore pressure, Young's modulus, and Poisson's ratio. Actual injection pressure data from a biosolids injector have been used to validate the new predictive technique. During the early well life, the match between the predicted fracture closure pressure values and those obtained from the G-function analysis was excellent, with an absolute error of less than 1%. In later injection batches, the predicted stress increment profile shows a clear trend consistent with the mechanisms of slurry injection and stress shadow analysis. Furthermore, the work shows that the injection operational parameters such as injection flow rate, injected volume per batch, and the volumetric solids concentration have strong impact on the predicted maximum disposal capacity which is reached when the injection zone in situ stress equalizes the upper barrier stress.

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Figures

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Fig. 1

Injection history of the biosolids injector

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Fig. 2

G-function analysis for the biosolids injector

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Fig. 3

Wireline well logs for the biosolids injector

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Fig. 4

Injection test falloff data for the biosolids injector

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Fig. 5

log–log diagnostic plot for the biosolids injector

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Fig. 6

Mechanical properties' calculations for the biosolids injector

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Fig. 7

Pressure and stress estimations for the biosolids injector

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Fig. 8

G-function analysis for four injection batches in the biosolids injector

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Fig. 10

Stress increment evaluation for different injection intervals

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Fig. 9

Predicted fracture closure pressure for the biosolids injector

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