Test method for measuring Biot coefficient of set cement
A test method and cement stone technology, which can be used in measuring devices, material inspection products, instruments, etc., and can solve problems such as complex test methods.
Pending Publication Date: 2022-02-22
BC P INC CHINA NAT PETROLEUM CORP +1
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[0004] Main purpose of the present invention is to provide a kind of test method of measuring cement stone Biot coefficient, to solve the complicated problem of the test method of measuring cement stone Biot coefficient in the prior art
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[0025] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0026] The Biot coefficient in this application refers to the poroelastic coefficient, which actually reflects the influence of the rock pore space on the overall properties of the rock, and it is a parameter in the poroelastic properties.
[0027] In order to solve the problem of complex test methods for measuring the Biot coefficient of cement stone in the prior art, the present invention provides a test method for measuring the Biot coefficient of cement stone.
[0028] Please refer to figure 1 and figure 2 , the test method for measuring the cement stone Biot coefficient includes step S1: put the cement stone sample 10 in a saturated state into a container 20, so that the container is wr...
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The invention provides a test method for measuring Biot coefficient of set cement, the test method comprises the following steps: step S1: putting a set cement sample in a saturated water state into a container, so that the container wraps the outer side of the set cement sample, and the container is made of a flexible material; s2, communicating a pressure device with one end of the container so as to control the water pressure in pores of the set cement sample; s3, loading different confining pressures on the set cement sample to obtain a first stress-strain curve of the set cement sample, and calculating the bulk modulus K of the set cement sample according to the first stress-strain curve; s4, under the condition that the confining pressure loaded on the set cement sample is not changed, applying different pressures to water in pores of the set cement sample to obtain a second stress-strain curve of the set cement sample; and S5, obtaining the Biot coefficient of the set cement sample according to the bulk modulus K and the second stress-strain curve. The test method solves the problem that the test method for measuring the Biot coefficient of the set cement in the prior art is complex.
Description
technical field [0001] The invention relates to the technical field of cement measurement, in particular to a test method for measuring the Biot coefficient of cement stone. Background technique [0002] Cement stone refers to the hardened cement paste, including various hydration products, residual clinker minerals and water condensed in the pores, etc. It has a certain mechanical strength and porosity, and its shape and many properties are similar to natural stone. Widely used in civil construction, water conservancy, national defense, oil and gas and other projects. In the process of oil and gas production, in order to strengthen the well wall and ensure continuous drilling and isolation of oil, gas and water layers, it is necessary to run casing, and fill cement in the annulus of the wellbore and casing, and solidify to form a cement sheath. Long-term stable oil and gas production channels. [0003] The cement sheath does not undergo mechanical damage during its servic...
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CPCG01N33/383
Inventor 沈吉云丁嘉迪王鹏李季纪宏飞刘慧婷夏修建靳建洲齐奉忠于永金丁志伟吕斌张硕张正荣陈艺鑫
Owner BC P INC CHINA NAT PETROLEUM CORP