Method for testing pressure bearing capacity of oil well cement lightening admixture

A technology of oil well cement and pressure bearing capacity, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., which can solve the problem that the test of the pressure bearing capacity of the lightening agent is not unified, so as to ensure the safety of cementing construction , to ensure stable performance and improve the effect of cementing quality

Inactive Publication Date: 2019-04-02
CNPC BOHAI DRILLING ENG
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Problems solved by technology

[0003] At present, there is no unified standard experimental method for testing the pressure-bearing capacity of lightening agents. Therefore, a method for testing the pressure-bearing capacity of lightening agents is designed. The actual pressure-bearing capacity of lightening materials can be evaluated by testing the breakage rate of lightening materials under different pressure conditions.

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  • Method for testing pressure bearing capacity of oil well cement lightening admixture

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments in no way limit the present invention.

[0018] A method for testing the pressure bearing capacity of an oil well cement lightening agent, such as figure 1 shown, including the following steps:

[0019] 1) Weigh a certain amount of water and lightening agent, and pour the mixed liquid into a plastic bag after fully stirring;

[0020] 2) Drain and seal the air in the plastic bag, and put the plastic bag containing the mixed liquid into the thickened pulp cup;

[0021] 3) Slowly add paraffin oil along the inner wall of the pulp cup, and put the pulp cup into the pressurized thickener;

[0022] 4) Carry out a pressurization experiment on the thickener, and take out the slurry cup after holding the pressure for two hours;

[0023] 5) Pour the mixed liquid in the plastic bag of the slurry cup into the prepared beaker, ...

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Abstract

The invention discloses a method for testing pressure bearing capacity of an oil well cement lightening admixture. The method comprises the following steps: pouring a mixed liquid of water and a lightening admixture into a plastic bag; putting the plastic bag into a thickening pulp cup; adding paraffin oil into the thickening pulp cup along the inner wall of the thickening pulp cup, and putting the thickening pulp cup into a pressurization thickening instrument; performing a pressurization test on the thickening instrument; standing for two hours, separating floating materials and sedimented materials and drying; and calculating the pressure bearing capacity of the oil well cement lightening admixture by virtue of mass of the obtained floating materials and sedimented materials. The methodfor testing the pressure bearing capacity of the oil well cement lightening admixture is easy to operate, the actual pressure bearing capacity of a lightening material is evaluated by testing breakage rates of the lightening material under different pressure conditions, then low-density cement paste with high pressure bearing capacity is prepared, stable performance and density of the cement paste as well as cement strength are guaranteed, well cementation construction safety is guaranteed, and well cementation quality is improved.

Description

technical field [0001] The invention relates to the technical field of oil field drilling, in particular to a method for testing the pressure bearing capacity of an oil well cement lightening agent. Background technique [0002] After the low-density cement slurry is injected into the bottom of the well, there is a trend of increasing density, which is likely to cause cement slurry leakage in the fractured formation, thereby increasing the occurrence of cementing accidents, reducing cementing benefits, increasing cementing complexity, and prolonging Construction time. At the same time, it affects the stability, density and cement strength of cement slurry. [0003] At present, there is no uniform standard experimental method for testing the pressure-bearing capacity of lightening agents. Therefore, a method for testing the pressure-bearing capacity of lightening agents is designed. The actual pressure-bearing capacity of lightening materials can be evaluated by testing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N5/00
CPCG01N3/08G01N5/00
Inventor 田宝振高飞宋元洪和建勇蒋世伟戴振刚覃毅陈斌张伟陈欣彤
Owner CNPC BOHAI DRILLING ENG
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