Effect of expandable cement on increasing sealing ability of cement sheath in shale gas wells

Liu, Kui; Gao, Deli; Yang, Jin; Wang, Zhengxu

doi:10.1016/j.petrol.2019.01.077

Journal of Petroleum Science and Engineering

2019

DOI: 10.1016/j.petrol.2019.01.077

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Effect of expandable cement on increasing sealing ability of cement sheath in shale gas wells

Kui Liu

Deli Gao

Jin Yang

et al.

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Cited by 13 publications

(1 citation statement)

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“…15,16 The tangential and radial stresses in the cement sheath can be obtained based on elastic-plastic theory. 17 Li et al 18 provided an analytical solution to simulate the effect of cement/formation stiffness on well integrity evaluation in carbon sequestration projects. Xi et al 19 combined an integrated method of analytical and numerical simulation to analyze the transient stress variation in the cement sheath when the temperature at the bottom of the well changed.…”

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confidence: 99%

Formation mechanism of continuous gas leakage paths in cement sheath during hydraulic fracturing

Lian

Qian

et al. 2020

Energy Science & Engineering

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Shale gas reservoirs are characterized by low porosity and permeability. As a result, conventional development methods cannot be used for commercial production of the gas. Therefore, hydraulic fracturing technology is required to achieve higher yields. [1][2][3][4][5] However, this method can seriously threaten the integrity (eg, sealing failure) of the cement sheath, leading to sustained casing pressure (SCP). 6 The reason for SCP is that the down-hole fluid migrates to the wellhead through continuous leakage paths, such as a microannulus between the casing and cement sheath or between the cement sheath and formation, microcracks in cement sheath, and casing threads, and then, the gas accumulates at the wellhead. [7][8][9] That is, the formation of SCP has two necessary conditions. 10,11 One is the gas/fluid source, and the other is the continuous leakage paths.Because the cement sheath is an important part of the wellbore barrier, it has been the focus of extensive research. The failure modes of the cement sheath usually include debonding,

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confidence: 99%

Formation mechanism of continuous gas leakage paths in cement sheath during hydraulic fracturing

Lian

Qian

et al. 2020

Energy Science & Engineering

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Mechanism of Cement Stone Porosity and Permeability Structures for Downhole Fluid Packing

Liu

et al. 2022

Arab J Sci Eng

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Mechanical properties of high-ferrite oil-well cement used in shale gas horizontal wells under various loads

Zhang

Cheng

et al. 2022

Construction and Building Materials

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Effect of expandable cement on increasing sealing ability of cement sheath in shale gas wells

Cited by 13 publications

References 21 publications

Formation mechanism of continuous gas leakage paths in cement sheath during hydraulic fracturing

Formation mechanism of continuous gas leakage paths in cement sheath during hydraulic fracturing

Mechanism of Cement Stone Porosity and Permeability Structures for Downhole Fluid Packing

Mechanical properties of high-ferrite oil-well cement used in shale gas horizontal wells under various loads

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