Cement interface shearing in annulus supersonic ultrasonic testing method

A testing method and technology of cement sheath, applied in the directions of surveying, earthwork drilling, wellbore/well components, etc., can solve the problem of not revealing the relationship of various parameters downhole, not revealing the hydraulic bonding strength and shear bonding strength of the cement sheath. Problems with compressive strength of cement

Inactive Publication Date: 2007-08-15
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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Problems solved by technology

[0007] However, in the prior art, the relationship between various downhole parameters has not been revealed
For example, the relationship between hydraulic bond strength, shear bond strength and cement compressive strength of the cement sheath cured under different confining pressure conditions, and the relationship between shear bond strength, cement compressive strength and logging response are not revealed. relationship, and the change of logging response after interfacial shear failure, etc.

Method used

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  • Cement interface shearing in annulus supersonic ultrasonic testing method
  • Cement interface shearing in annulus supersonic ultrasonic testing method
  • Cement interface shearing in annulus supersonic ultrasonic testing method

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Embodiment Construction

[0043] As shown in FIG. 1 , a preferred embodiment of the cement sheath interface shear ultrasonic tester includes an oil tank 10 and an oil pump 8 , and the oil tank 10 and the oil pump 8 are connected through pipelines. An upper cover 3 is arranged on the upper part of the pressure vessel 11 , and the upper cover 3 is provided with an upper cover through hole 15 . The pressure vessel 11 is provided with an outer casing 2 inside, and an inner casing 1 is arranged inside the outer casing 2 , and the height of the inner casing 1 is lower than that of the outer casing 2 . The lower part of the pressure vessel 11 is provided with a piston 7, the upper part of the piston 7 is in contact with the lower part of the inner casing 1, and the lower part of the piston 7 is provided with a thrust cylinder 6, and the piston obtains upward thrust through the thrust cylinder 6. Thrust oil cylinder 6 is provided with thrust oil cylinder hole 14 on the side, and this thrust oil cylinder hole 1...

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Abstract

The invention discloses a shearing ultrasonic testing method of cement annular interface, comprising that pouring cement pulp between an inner muffle and an outer muffle until the pulp reaches preset height, pours water into the inner muffle and outside the outer muffle until the pressure container is filled, arranging an sonic measuring device vertically and concentrically in the inner muffle, connecting a heating power circuit with all temperature and pressure sensors and the sonic measuring circuit, and connecting the power source, heating the pressure container, and pumping liquid into the pressure container when the temperature reaches preset value, to lift liquid pressure to preset value, processing sonic measurement intermitted, and processing sonic measurement when the cement reaches preset strength, and processing adhesive strength test when the system enters into the adhesive strength test step, and processing the last sonic measurement.

Description

technical field [0001] The invention relates to a cementing quality detection experiment technology, in particular to a cement sheath interface shear ultrasonic testing method. Background technique [0002] At present, the cementing engineering field generally believes that under the condition of no cement trench, the sealing performance of the cement sheath mainly depends on the two interfaces between it and the casing and the formation (referred to as the first interface and the second interface respectively). ) of the bond strength. Bonding strength is further divided into hydraulic bonding strength and shear bonding strength. Experiments have shown that the greater the hydraulic bonding strength, the greater the shear bonding strength. When the cement sheath is in close contact with the casing, the compressive strength of the cement is high, and the hydraulic bond strength and shear bond strength of the interface are also large. Unfortunately, no one has been able to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/14
Inventor 魏涛
Owner CHINA NAT OFFSHORE OIL CORP
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