Special Considerations in the Design Optimization of the Production Casing in High-Rate, Multistage-Fractured Shale Wells

Sugden, Catherine; Johnson, John L.; Chambers, M. R.; Ring, Gary; Suryanarayana, Phanish

doi:10.2118/151470-pa

Cited by 33 publications

(8 citation statements)

References 10 publications

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“…Yin et al (2018a), Yin et al 2018b, Yin et al 2018c proposed that variation of annular pressure caused by cold fracturing fluid increases the risks of casing deformation. Sugden et al (2012), Xi et al (2019), Lian et al (2020), Guo et al (2018), Guo et al (2019 and others proposed that the cementing quality problems such as casing eccentricity and lack of cement sheath cause asymmetric load on the casing, and the effects of fracturing fluid on the difference of temperature from the heel to the toe end of the lateral increases the risks of casing failure at the heel end stages.…”

Section: Introductionmentioning

confidence: 99%

Casing Deformation Response and Controlling Technology Based on Diagnostics of Shale Gas Fracturing Curve

Cheng¹,

Zeng²,

Wu³

et al. 2022

Front. Energy Res.

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Casing deformation (CD) will seriously affect the fracturing progress and stimulation effect of shale gas. Taking 105 gas wells in the Luzhou shale gas area in southern Sichuan as an example, the CD prediction model was established by introducing the fracture operation curve diagnosis method to analyze the changes in net pressure and propagation mode during fracturing. The fracturing stage induced by CD is called the excited (ET) stage, and the fracturing stage that occurs during CD is called the CD stage. It is concluded that the change of net pressure and the propagation mode are coupled with each other. By natural fracture development, formation curvature and horizontal well trajectory, natural fractures and bedding have been active by high fracturing strength, or because of the frequent crossing-layer in single stage, local stress reverse, makes the net pressure decrease and makes the formation in strike-slip stress state to reverse fault stress state, liquid leak-off and blocked fracture propagation time are increased, thus inducing CD. According to the response law induced by CD, the CD pre-control mode is formed, and the CD pre-control technology is established to quantitatively evaluate the wellbore risk and optimize the fracturing operation order and time arrangement. The CD rate is reduced from 56% in the early stage to 20%, and the integrity of the wellbore is guaranteed to be 100%. The method has strong applicability in the field and can be further popularized.

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Section: Introductionmentioning

confidence: 99%

Casing Deformation Response and Controlling Technology Based on Diagnostics of Shale Gas Fracturing Curve

Cheng¹,

Zeng²,

Wu³

et al. 2022

Front. Energy Res.

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show abstract

“…The engineering factors include casing eccentricity, poor cementing quality, large curvature of the wellbore trajectory, and high operation pressure during fracturing. Sugden et al 9 noted that thermal stress generated by temperature change during hydrofracturing increases the casing bending stress in the building section and decreases the pressure in the annulus fluid, which causes the casing strength to decrease. On the basis of Sugden's opinion, Yin and Gao 10 inferred that casing damage is caused by the thermal expansion of the bound fluid in the wellbore annulus and squeezing the casing.…”

Section: Introductionmentioning

confidence: 99%

Effect of fracture-induced stress on casing integrity during fracturing in horizontal wells

Yin

Zhao

et al. 2022

Advances in Mechanical Engineering

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As a necessary technical method for shale gas development, hydraulic fracturing technology may cause casing failure while realizing actual reservoir reformation. The fracture-induced inhomogeneous stress generated while the hydraulic fracture is one of the main reasons for the non-uniform compression and failure of the casing. The fracture-induced stress field is mainly related to the fracture net pressure and is unrelated to the initial in-situ stress. The non-uniform load difference near the fracture is more significant, and the mechanical environment of the casing deteriorates. In this study, we combined the fracture-induced stress calculation model and the casing-cement-formation system stress distribution model to analyze the mechanical properties of the system during hydrofracturing. We used the model to calculate the casing stress distribution under fracture-induced stress and analyzed various influencing factors that affect the maximum equivalent stress (MES) on the casing. The studies show that the closer to the fracture, the greater the induced stress and MES in the casing, and the risk of casing collapse increases. The wall thickness of the casing has an influence on the MES. The larger the wall thickness, the smaller the MES. The MES of the casing reaches the maximum value when the elastic modulus of the cement stone is close to that of the stratum. Softer formation increases the potential that the fracture-induced stress transfers to the casing. The potential is responsible for the greater stress of the casing. By increasing hydraulic fracturing stages, reducing hydraulic fracturing wellhead pressure, increasing casing wall thickness and reducing the elastic modulus of cement stone can reduce the casing stress and alleviate casing damage.

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“…(3) Damage of well structure. In the hydraulic fracturing process, fracturing fluid may enter the natural fractures that intersect the wellbore along a particular channel, causing the fluid pressure in the fracture to increase [29,30]. When the pressure of fracture increases to a critical value, the combined force of the frictional force on the fracture surface and the shear stress generated by the wellbore resisting the fracture surface slippage will be less than the shear stress of the formation slippage.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Research on Improvement Effect of Ultrasonic Waves on Seepage Characteristics of Coalbed Methane Reservoir

Zhang

et al. 2021

Energies

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The matrix pores of a coalbed methane (CBM) reservoir are mostly nanoscale pores, with tiny pore throats and poor connectivity, which belong to the category of low–permeability gas reservoirs. The matrix particles and organic pore surfaces adsorb a large amount of CBM. These problems are the main reasons that limit the increase in CBM production. At present, the primary measure to increase CBM production is hydraulic fracturing. However, due to the technical characteristics and geological conditions of CBM reservoirs, applying this technology to CBM exploitation still has some key issues that need to be resolved. Therefore, it is essential to develop a new technology that can effectively increase the production of CBM. This paper proposed a method that uses ultrasonic waves to improve the seepage characteristics of CBM reservoir and theoretically verifies the feasibility of this idea using numerical simulation. In this paper, we firstly coupled the temperature, pressure, and seepage parameters of the CBM reservoir and built a CBM seepage model under the action of ultrasonic waves. Secondly, by comparing the numerical simulation results with the experiment, we verified the accuracy of the model. Finally, on the basis of the mathematical model, we simulated the change characteristics of pore pressure, reservoir temperature, permeability, and porosity under the action of ultrasonic waves. Research results show that under the action of ultrasonic waves, the pressure-drop funnel of CBM reservoir becomes more apparent. The boundary affected by the pressure drop also increases. With the increase of the action time of ultrasonic waves, the temperature of CBM reservoir also increases, and the action distance is about 4 m. With decreased pore pressure, the permeability and porosity of CBM reservoir significantly increase under the action of ultrasonic waves. With increased ultrasonic power, its effect on reservoir permeability and porosity becomes more significant.

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Special Considerations in the Design Optimization of the Production Casing in High-Rate, Multistage-Fractured Shale Wells

Cited by 33 publications

References 10 publications

Casing Deformation Response and Controlling Technology Based on Diagnostics of Shale Gas Fracturing Curve

Casing Deformation Response and Controlling Technology Based on Diagnostics of Shale Gas Fracturing Curve

Effect of fracture-induced stress on casing integrity during fracturing in horizontal wells

Numerical Simulation Research on Improvement Effect of Ultrasonic Waves on Seepage Characteristics of Coalbed Methane Reservoir

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