Integrity tests of cement sheath for shale gas wells under strong alternating thermal loads

被引：0
|
作者：
Lin Y. [1 ]
Deng K. [1 ]
Yi H. [2 ]
Zeng D. [1 ]
Tang L. [3 ]
Wei Q. [1 ]
机构：
[1] State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan
[2] Research Institute of Petroleum Engineering, Sinopec Northwest Oilfield Company, Urumqi, 830011, Xinjiang
[3] Chongqing Xinyu Pressure Vessel Manufacturing Co. Ltd., Chongqing
来源：
Deng, Kuanhai (dengkuanhai@163.com) | 1600年 / Natural Gas Industry Journal Agency卷 / 40期
关键词：
Cement sheath integrity; Full-scale test; Interfacial mechanical property; Production casing-cement sheath-intermediate casing; Shale gas well; Strongly alternating thermal load; Temperature difference;
D O I：
10.3787/j.issn.1000-0976.2020.05.010
中图分类号：
学科分类号：
摘要：
During large-scale hydraulic fracturing in shale gas horizontal wells, a cement sheath easily loses its integrity due to the fluctuation and continuous change of wellbore temperature and pressure and the cyclic loading and unloading, which will threaten wellbore integrity. The failure mechanism of cement sheath integrity under strong alternating thermal loads and the prevention of cement sheath barrier failure during large-scale hydraulic fracturing in shale gas horizontal wells were studied using the independently developed experimental device. Integrity experimental results of two kinds of full-scale cement sheaths (conventional and high-strength cement sheaths) under three kinds of strong alternating thermal loads (cycle number for the occurrence of discontinuous CO2 bubble: 4 and 14; cycle number for the occurrence of continuous CO2 bubble: 5 and 15; alternating thermal load: 30-120℃ and 30-150℃) were obtained. Alternating thermal load had a significant negative impact on the integrity of cement sheath, and with the increase of alternating temperature and temperature difference, the thermal cycle number characterizing the sealing integrity of cement sheath reduced sharply. The interfacial mechanical property indicators that characterize the shearing force between cement sheath and casing and the axial and radial bonding strength decreased with the increase of the alternating temperature. The micro annulus in cement sheath was mainly caused by discordant deformation between the casing and the cement sheath materials, and the mechanical degradation and deterioration of the set cement induced by the alternating thermal load aggravated the failure of the sealing integrity of cement sheath to a certain degree.
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页码：81 / 88
页数：7
相关论文
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