Experimental device for hydraulically simulating non-uniform confining pressure of casing pipe and using method
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An experimental device and non-uniform technology, applied in the field of simulation experiments, to achieve the effect of preventing casing instability and damage, preventing instability and damage
Pending Publication Date: 2020-04-21
SOUTHWEST PETROLEUM UNIV
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[0003] At present, there are many devices that can simulate the casing under uniform confining pressure under
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Embodiment 1
[0042] Embodiment 1. Embodiment 1 is an experimental device for hydraulically simulating non-uniform confining pressure of casings with 4 groups of pressurized components
[0043] Such as figure 1 , figure 2 , image 3 As shown, a hydraulic simulation experiment device for casing non-uniform confining pressure of the present invention comprises kettle cover 1, casing upper cover 2, cement sprue 3, kettle body 4, casing 5, cement sheath 6, rubber Cylinder 7, double semicircular cylinder liner 8, built-in data line 9, air valve 10, pneumatic hydraulic pump 11, hydraulic push rod 12, mechanical pusher 13, strain patch 14, strain gauge 15, strain gauge data line 16, top sealant Ring 17, water inlet 18, thermocouple 19, water outlet 20, bottom sealing rubber ring 21, casing lower cover 22.
[0044] The experimental device includes a kettle body assembly, an experimental assembly, a data acquisition assembly, and a pressurization assembly.
[0045] The kettle body assembly incl...
Embodiment 2
[0058] Embodiment 2. Embodiment 2 is an experimental device for hydraulic simulation of casing non-uniform confining pressure of 8 groups of pressurized components
[0059] Such as figure 1 , figure 2 , Figure 4 As shown, the structure of this embodiment 2 is basically the same as that of embodiment 1, the difference is that the number of pressurized components is 8 groups, the angle between the pressurized components and the center line of the kettle body is 45°, and the distribution density is higher. The higher the pressure, the greater the distribution of the confining pressure that the pressurizing component can achieve when applying pressure to the casing 5, and the more realistic simulation of the impact of the non-uniform confining pressure in the formation on the casing 5 and the cement sheath 6.
[0060] The test method of embodiment 2 is:
[0061] First, the strain gauge 15 is evenly attached to the corresponding position on the inner wall of the casing 5, and ...
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Abstract
The invention provides an experimental device for hydraulically simulating non-uniform confining pressure of a casing pipe and a using method. The experimental device comprises a kettle body assembly,an experimental assembly, a pressurizing assembly and a data acquisition assembly, wherein the kettle body assembly comprises a kettle body and a kettle cover; the casing pipe in the experiment assembly is arranged in the kettle body, the casing pipe, a casing pipe upper cover, a casing pipe lower cover and a rubber cylinder form a sealed interlayer for curing cement, the outer layer of the rubber cylinder is wrapped with a double-semicircle cylinder sleeve, and the cement is injected into the sealed interlayer by means of a cement injection port of the casing pipe upper cover to be cured into a cement sheath; on the side surface of the kettle body, the pressurizing assembly composed of a pneumatic hydraulic pump, a hydraulic push rod and a mechanical pushing hand applies non-uniform confining pressure to the casing pipe in a direction perpendicular to the axial direction of the casing pipe, so as to simulate non-uniform load under the stratum condition; and the obtained experimentaldata are collected by means of strain gauges in the data acquisition assembly on inner side of the casing pipe and strain patches on the surface of the mechanical pushing hand and are transmitted to acomputer in real time by means of data lines, the experimental result is visual and precise, and the compression condition of the casing pipe under the real stratum condition can be effectively simulated.
Description
technical field [0001] The invention relates to the field of simulation experiments in the development of petroleum and natural gas, in particular to a hydraulic experimental device for simulating non-uniform confining pressure of a casing and a method for using it. Background technique [0002] Casing can form oil and gas flow channels, and is widely used in oil and gas well cementing and well completion operations, effectively ensuring the stability of the well wall and smooth drilling. In the actual operation of oil and gas wells, the casing will face the non-uniform in-situ stress of the plastic creep formation and the high pressure difference and alternating stress caused by the complex completion method, and the failure of the casing under complex terrain conditions is increasingly becoming an influence. Important issues in current oil well operations. Therefore, it is very necessary to study the mechanical behavior of the cement sheath and the production casing under...
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