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Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting

A Brazilian splitting and tensile strength technology, used in measuring devices, using stable tension/pressure to test material strength, strength characteristics, etc. Problems such as inability to apply confining pressure to the core

Active Publication Date: 2021-04-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a rock core tensile strength testing device and method under confining pressure conditions based on Brazilian splitting. The technical problems to be solved include the inability to apply confining pressure to the rock core in the prior art to simulate the geological environment in oil and gas development, and the difficulty Accurate positioning of small-volume cores leads to insufficient accuracy of experimental results, so as to achieve accurate positioning of small-volume cores and facilitate the application of confining pressure

Method used

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  • Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting
  • Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting
  • Device and method for testing tensile strength of rock core under confining pressure condition based on Brazilian splitting

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Embodiment 1

[0053] Such as Figure 2 to Figure 3 , Figure 6 to Figure 7 The shown rock core tensile strength test device under the confining pressure condition based on Brazil splitting, wherein figure 2 and image 3 It is a schematic diagram of the same structure in different sections; it includes a cylinder body 1, and the upper and lower ends of the cylinder body 1 are respectively detachably connected to the upper pressure head 2 and the lower pressure head 3; the cylinder body 1 is provided with a guide cylinder 6 and a rubber sleeve 7, It also includes a pressing rod 4 passing through the upper pressing head 2 and the guide cylinder 6 in the axial direction, and a support rod 5 passing through the lower pressing head 3 in the axial direction. The pressing rod 4 is slidingly fitted with the upper pressing head 2 and the guiding cylinder 6, The supporting rod 5 is detachably fixedly connected with the lower pressing head 3, and the bottom end of the pressing rod 4 and the top end ...

Embodiment 2

[0069] Such as Figure 4 to Figure 7 The shown rock core tensile strength test device under the confining pressure condition based on Brazil splitting, wherein Figure 4 and Figure 5 It is a schematic diagram of the same structure in different sections; the difference between this embodiment and Embodiment 1 is that it also includes an annular piston 14 outside the pressure rod 4, the outer wall of the annular piston 14 is in contact with the inner wall of the upper pressing head 2, and the annular piston 14 is in contact with the pressure rod. 4 is relatively fixed in the axial direction; it also includes a piston fluid inlet 15 provided on the barrel 1 and / or the upper pressure head 2, and the fluid applied to the piston fluid inlet 15 pushes the annular piston 14 downward. The top of the pressure rod 4 is sleeved with a hollow tightening bolt 16. The pressure rod 4 includes a diameter-expanding portion 401. The tightening bolt 16 is located above the diameter-expanding po...

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Abstract

The invention discloses a device and method for testing the tensile strength of a rock core under the confining pressure condition based on Brazilian splitting. The device comprises a cylinder, and the upper end and the lower end of the cylinder are connected with an upper pressing head and a lower pressing head correspondingly; and a guide cylinder, a rubber sleeve, a pressing rod penetrating through the upper pressing head and the guide cylinder and a supporting rod penetrating through the lower pressing head are arranged in the cylinder, and the bottom end of the pressing rod and the top end of the supporting rod are both inserted into the rubber sleeve. The bottom surface of the guide cylinder and the top surface of the supporting rod are cambered surfaces matched with the outer diameter of a rock core to be measured, and when the pressing rod descends to the bottom end of the stroke, the expanding part on the pressing rod is in contact with the top end of the guide cylinder; a splitting tool bit is arranged at the bottom of the pressing rod; and a closed annulus is formed between the rubber sleeve and the cylinder body, and a confining pressure inlet is formed in the cylinder body. The device is used for solving the problems that in the prior art, confining pressure cannot be applied to a rock core to simulate the geological environment in petroleum and natural gas development, and accurate positioning of a small-size rock core is difficult to meet, so that the accuracy of an experiment result is insufficient, and the purposes of accurately positioning the small-size rock core and conveniently applying the confining pressure are achieved.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a device and method for testing rock core tensile strength under confining pressure conditions based on Brazilian splitting. Background technique [0002] In the field of oil and gas, the tensile strength of formation rock is an important geological parameter, which is closely related to the wellbore stability during drilling and hydraulic fracturing during stimulation. Tensile strength is a basic concept in rock mechanics courses, an important mechanical property of rocks, and an important parameter in the stability analysis of rock structures. As a typical brittle material, the tensile strength of rock is much smaller than its compressive strength. When the tensile stress on the rock is higher than the tensile strength of the rock, the rock will undergo tensile failure, and its failure is usually controlled by the tensile strength. Therefore, the rock Accurate measurem...

Claims

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Application Information

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IPC IPC(8): G01N3/10G01N3/08G01N3/04
Inventor 辜思曼丁瑜胡刚杜培伟华晓航
Owner SOUTHWEST PETROLEUM UNIV
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