Device and method for mechanical sealing evaluation of cement ring when large fracturing is performed

A mechanical seal and cement sheath technology, which is applied in the testing of mechanical components, liquid tightness measurement using liquid/vacuum degree, and measuring devices, etc. It can solve the problems of inability to compare the performance of cement sheaths and quantitative analysis.

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Existing literature reports use the simulated wellbore to carry out qualitative analysis of the sealing performance of the cement sheath, without actual field simulation and stress-strain measurement. Therefore, the existing technology cannot obtain the results of quantitative analysis and relevant data support, so it is impossible to analyze different Therefore, it is impossible to provide experimental tests and data basis for the selection of cement slurry system

Method used

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  • Device and method for mechanical sealing evaluation of cement ring when large fracturing is performed

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] The test temperature was slowly raised from room temperature to 85°C within 24 hours, 2MPa gas was injected into the bottom annulus to keep the gas stable, and the circumferential stress of the cement annulus was measured at 0.52MPa. The temperature rose slowly to 120°C within 48 hours, the pressure at the top of the annulus was detected to be 1.9MPa, the peak value of the circumferential stress of the cement annulus was 2.3MPa, and the seal of the cement annulus failed. Confirm that the cement sheath seal fails due to thermal expansion, and record the relevant data.

example 2

[0045] The test temperature is 23°C, and the gas pressure is 2MPa injected into the bottom of the cement sheath. Pressurize the inner cylinder of the annular space model through the liquid booster pump, and the boosting rate is 10MPa / 10min. When the internal pressure is 30MPa, the circumferential stress of the cement sheath is measured to be 1.4MPa, and the top pressure is 0MPa, and no sound signal is detected by the acoustic wave detection instrument. When the internal pressure of the model is 61.5MPa, the measured circumferential stress drops from 2.3MPa to 0MPa, the bubble detector has an obvious peak, and the sound wave detects an obvious peak, and the pressure at the top of the model is 1.8MPa. It was confirmed that the internal pressure overload caused the tensile failure of the cement sheath, resulting in the failure of the cement sheath seal.

Embodiment 3

[0047] The experimental temperature rises slowly from 23°C, and the maximum temperature does not exceed 85°C. The bottom of the cement sheath is injected with a gas pressure of 2MPa, and the inner cylinder of the annulus model is pressurized through a liquid booster pump, and the experimental pressure boost rate is 10MPa / 10min. When the internal pressure is 30MPa, the circumferential stress of the cement sheath is measured to be 1.7MPa, the top pressure is 0MPa, and no sound signal is detected by the acoustic wave detection instrument. When the internal pressure of the model is 55MPa, the measured circumferential stress drops from 2.3MPa to 0MPa, the bubble detector has an obvious peak, and the sound wave detects an obvious peak, and the pressure at the top of the model is 1.8MPa.

[0048] After comparing the data of the above three examples with the cement sheath that has not been tested, it can be seen that the change of temperature and pressure leads to the sealing failure ...

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Abstract

The invention discloses a device and method for mechanical property evaluation and mechanical sealing evaluation of a cement ring when large fracturing is performed. The device comprises a to-be-measured cement ring, an inner cylinder sleeving an inner surface of the cement ring, an outer cylinder sleeving an outer surface of the cement ring, a pressure-adjustment mechanism connected with the inner cylinder to adjust a pressure acting on an inner wall of the cement ring, a temperature control mechanism connected with the cement ring and controlling temperature of the cement ring, and a detection assembly for detecting a stress state, a stress size and mechanical sealing performance of the cement ring. The device can test mechanical properties and mechanical sealing performance of the cement ring well, and a data support is provided for selection of a cement slurry system when large hydrofracture of, especially, an unconventional reservoir layer occurs.

Description

technical field [0001] The invention relates to a test and experiment device, in particular to a device and method for evaluating the mechanical seal performance of a cement sheath during large-scale fracturing, especially for large-scale hydraulic fracturing conditions. Background technique [0002] In recent years, the development of unconventional oil and gas has become a hot spot in the domestic oil industry. Because unconventional oil and gas (especially shale oil, shale gas, tight sandstone oil, tight sandstone gas, etc.) are low-porosity and low-permeability reservoirs, large-scale hydraulic fracturing is required. However, large-scale hydraulic fracturing has higher requirements on the mechanical properties of the cement sheath, such as the elasticity and toughness of the cement sheath, and requires effective isolation between stages. Therefore, it is necessary to simulate staged fracturing to evaluate the mechanical properties of the cement sheath and mechanical se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01M3/04
Inventor 陶谦周仕明杨红歧汪晓静
Owner CHINA PETROLEUM & CHEM CORP
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