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Research Papers: Petroleum Engineering

Initiation Pressure and Corresponding Initiation Mode of Drilling Induced Fracture in Pressure Depleted Reservoir

[+] Author and Article Information
Qi Gao

College of Petroleum Engineering,
China University of Petroleum (East China),
Qingdao 266580, China
e-mail: 935131241@qq.com

Yuanfang Cheng

College of Petroleum Engineering,
China University of Petroleum (East China),
Qingdao 266580, China
e-mail: 731491711@qq.com

Chuanliang Yan, Long Jiang, Songcai Han

College of Petroleum Engineering,
China University of Petroleum (East China),
Qingdao 266580, China

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 16, 2018; final manuscript received June 25, 2018; published online July 23, 2018. Assoc. Editor: Arash Dahi Taleghani.

J. Energy Resour. Technol 141(1), 012901 (Jul 23, 2018) (9 pages) Paper No: JERT-18-1046; doi: 10.1115/1.4040753 History: Received January 16, 2018; Revised June 25, 2018

With the production of oil and gas from the reservoir for a long period of time, pore pressure will decline from the initial value to a lower level, which narrows the safety mud weight window, and consequently, makes it easier to generate the drilling induced fracture (DIF). In this paper, a new analytical model is proposed for predicting initiation pressure and corresponding initiation mode of DIF in the pressure depleted reservoir. The effect of pore pressure decline on stress field is considered. Formation around the borehole is divided into plastic zone and elastic zone according to the geomechanical parameters, and small deformation theory is adopted in both of the plastic zone and the elastic zone. For the plastic zone, the nonlinear constitutive relationship is captured using equivalent stress and equivalent strain. In addition, excess pore pressure theory is introduced to describe the pore pressure change during the drilling process owing to the formation of mudcake on the borehole wall. Then, the stress and pore pressure distribution in these two zones and the radius of the plastic zone are obtained. Meanwhile, the theoretical formula of initiation pressure and the corresponding initiation mode of DIF are derived. The reliability of the new model is validated by comparing the obtained results with other published models and the field measured data.

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Figures

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Fig. 1

Mechanical model of the wellbore

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Fig. 2

Variation of initiation pressure and initiation mode of DIF against reservoir depth with pore pressure drop equaling to 5 MPa

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Fig. 3

The variation of total and effective stresses with pore pressure drop at the reservoir depth of 3000 m

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Fig. 4

The variation of initiation pressure of DIFs with pore pressure drop at different reservoir depth

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Fig. 5

Variation of stresses and pore pressure with the distance from the borehole wall when elastic tensile fracture is formed at the reservoir depth of 2500 m

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Fig. 6

Variation of stresses and pore pressure with the distance from the borehole wall when plastic tensile fracture is formed at the reservoir depth of 3500 m

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Fig. 7

Variation of stresses and pore pressure with the distance from the borehole wall when plastic shear fracture is formed at the reservoir depth of 4500 m

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