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Sealing method of differential strain method ground stress test element

A technology for testing pieces and in-situ stress, which is applied in natural gas geology, exploration and development projects, and petroleum fields. It can solve problems such as inability to ensure uniform sealant, influence of sealant on rock sample components, and complicated methods, and achieve heat curing and water resistance. Strong performance and simple encapsulation method

Active Publication Date: 2019-11-15
克拉玛依市昂科能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses sealant to cover the rock sample. Even if the sealant is scraped with a scraper, it cannot ensure that the sealant does not contain air bubbles and is uniform.
[0006] Chinese patent 201410599253 discloses a method for calculating in-situ stress by differential strain analysis. When sealing a rock sample, first put the rock sample into a square mold, then pour the sealant into the mold to fill the rock sample, and at the same time vacuum the rock sample To discharge the air in the sealant, but the method of using vacuum to discharge the air in the sealant is more complicated, and the process of vacuuming may affect the rock sample components and even the sealant

Method used

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  • Sealing method of differential strain method ground stress test element
  • Sealing method of differential strain method ground stress test element
  • Sealing method of differential strain method ground stress test element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The method for sealing the stress test piece of the differential strain method comprises the following steps:

[0057] Make rock samples according to the requirements, polish the surface of the rock samples smoothly, then dry them in an oven, wipe the surface of the rock samples with anhydrous ethanol, wipe the rock samples clean, and paste the strain gauges on the corresponding positions of the test pieces. The location of the slice is as follows figure 1 shown;

[0058] Make sealing molds, sealing molds such as image 3 As shown, the inner groove of the sealing mold matches the shape of the rock sample, and the size of the inner groove is slightly larger than the rock sample for the rock sample to be put in. The sealing mold is made of metal, and its size is 4.1cm*5.4cm*6.5cm; Apply a lubricant to the inner surface of the sealed mold, the lubricant is preferably lubricating silicone grease;

[0059] Preparation of sealant: Weigh 6101 bisphenol A epoxy resin, methyl...

Embodiment 2

[0065] The method for sealing the stress test piece of the differential strain method comprises the following steps:

[0066] Make rock samples according to the requirements, polish the surface of the rock samples smoothly, then put them in an oven to dry, wipe the surface of the rock samples with acetone, wipe the rock samples clean, and paste the strain gauges on the corresponding positions of the test pieces;

[0067] Make a sealing mold, open an inner groove on the metal sealing mold, the inner groove matches the shape of the rock sample, and the size of the inner groove is slightly larger than the rock sample for the rock sample to be put in; the size of the sealing mold is 4.1cm*5.4cm* 6.5cm; and apply lubricating silicone grease on the surface forming the inner groove;

[0068] Preparation of sealant: Weigh 6101 bisphenol A epoxy resin, methyl tetrahydrophthalic anhydride, dibutyl phthalate, activated nano-alumina and polyurethane and pour them into paper cups, the rati...

Embodiment 3

[0073] The method for sealing the stress test piece of the differential strain method comprises the following steps:

[0074] Make rock samples according to the requirements, polish the surface of the rock samples smoothly, then put them in an oven to dry, wipe the surface of the rock samples with acetone, wipe the rock samples clean, and paste the strain gauges on the corresponding positions of the test pieces;

[0075] Make a sealing mold, open an inner groove on the metal sealing mold, the inner groove matches the shape of the rock sample, and the size of the inner groove is slightly larger than the rock sample for the rock sample to be put in; the size of the sealing mold is 4.1cm*5.4cm* 6.5cm; and apply lubricating silicone grease on the surface forming the inner groove;

[0076] Preparation of sealant: Weigh 6101 bisphenol A epoxy resin, methyl tetrahydrophthalic anhydride, dibutyl phthalate, active nano silicon oxide and polyurethane and pour them into a paper cup, the ...

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Abstract

The invention belongs to the field of petroleum and natural gas geology and exploration and development engineering, and mainly relates to a sealing method of a stratum ground stress test element by using a differential strain method. The method comprises the following steps of grinding and wiping the test element; bonding a strain sheet in a corresponding position of the test element; making a sealing mold used for sealing the test element; preparing a sealant; then, putting the test element bonded with the strain sheet into the sealing mold; performing sealant filling for sealing; performingintegral thermocuring on the sealing mold; and performing demolding to obtain the sealed test element. The sealing mold and the prepared sealant are used for sealing the test element, and the flatness degree of the sealant on the surface of the test element is ensured; meanwhile, by using the sealing method provided by the invention, the obtained sealant has few bubbles; each position of the sealant layer subjected to thermocuring is uniform; and the accuracy and the reliability of test data are ensured.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas geology and exploration and development engineering, and mainly relates to a method for sealing a stratum stress test piece by using a differential strain method. Background technique [0002] In-situ stress is the stress existing in rock mass before human engineering activities, also known as rock mass initial stress, absolute stress or original rock stress. The study of geostress has a wide range of applications. For example, the magnitude and change of in-situ stress is one of the factors that control the distribution of oil and gas enrichment areas, the expansion of hydraulic fractures, the distribution of reservoir fractures, the long-term external load of oil well casing, and the fracture pressure and collapse pressure of drilling formations. It is also an indispensable basic data for the formulation of oil and gas field development plans and oil well engineering design. [0003] A...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01L5/00G01N1/36G01N1/32G01N1/44
CPCG01L5/00G01N1/32G01N1/36G01N1/44G01N3/12G01N2001/366
Inventor 邱潇焦福生闫旭华
Owner 克拉玛依市昂科能源科技有限公司
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