Method for testing normal cementation parameters of casing cement sheath interface
A technology of parameter testing and cement sheath, which is applied in the direction of measuring devices, instruments, and mechanical devices, can solve the problems of undiscovered test methods for normal bond stiffness and normal bond fracture energy, and achieve the effect of improving test efficiency
Active Publication Date: 2022-01-28
CHINA UNIV OF PETROLEUM (BEIJING)
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[0006] At present, the existing patents only involve the test of normal bond strength, and there is no test method for normal bond stiffness and normal bond fracture energy
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[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0059] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer" and the like are based on the orientation or positional relationship shown in the accompanying drawings, and are only for It is convenient to describe the present invention and simplify the description, but does not indicate or imply that the system or el...
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The invention relates to a method for testing the normal cementation parameters of a casing cement sheath interface, which comprises the following steps of: preparing a normal cementation parameter testing device which comprises a casing infinitesimal piece and cement bonded with the casing infinitesimal piece, an interface formed between the cement and the casing infinitesimal piece being a casing cement sheath interface; continuously loading the casing infinitesimal piece until the casing infinitesimal piece is separated from the cement, and recording and storing load-displacement data in the loading process; converting the load-displacement data into stress and strain data; and drawing a stress-strain curve graph according to the stress and strain data, and obtaining normal bond strength, normal bond rigidity and normal bond fracture energy according to the curve graph. The normal cementation parameter testing method provided by the invention not only can be used for testing the normal cementation strength of the casing cement sheath interface, but also can be used for further testing the normal cementation rigidity and the normal cementation fracture energy of the casing cement sheath interface.
Description
technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for testing cementation parameters in the normal direction of the casing cement sheath interface. Background technique [0002] In the gas storage multi-round injection-production process and CO 2 During the reinjection process, the wellbore will be subjected to alternating fluctuating internal pressure. When the internal pressure increases during gas injection, the casing will expand, and the internal pressure will decrease during the gas production process. The casing will shrink again. During the repeated expansion and contraction process, the casing and cement The difference in the mechanical properties of the annulus is prone to inconsistent deformation of the two, which leads to the separation of the casing-cement sheath interface to form a micro-annulus. During the subsequent gas injection and production process, the gas will escape along the micro-ann...
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IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 汪衍刚冯永存邓金根闫伟李晓蓉王孔阳
Owner CHINA UNIV OF PETROLEUM (BEIJING)