CN209945889U - Reliability testing device for rubber cylinder under corrosion and stress action - Google Patents
Reliability testing device for rubber cylinder under corrosion and stress action Download PDFInfo
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- CN209945889U CN209945889U CN201920534984.XU CN201920534984U CN209945889U CN 209945889 U CN209945889 U CN 209945889U CN 201920534984 U CN201920534984 U CN 201920534984U CN 209945889 U CN209945889 U CN 209945889U
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Abstract
A reliability testing device of a rubber cylinder under the action of corrosion and stress is characterized in that: the device consists of a central shaft, a nut, a pressure ring, a packer rubber cylinder, a test sleeve, a square block, a concentric circle bottom plate, a high-temperature strain gauge, a high-temperature lead and a strain gauge; the testing device is assembled and then placed in a high-temperature high-pressure autoclave, and the contact stress between the packer rubber cylinder and the testing sleeve under various working conditions can be tested by setting the temperature, the pressure and the corrosion medium of the high-temperature high-pressure autoclave, so that the change rule of the contact stress between the packer rubber cylinder and the sleeve in the corrosion process of the packer rubber cylinder is obtained; the corrosion resistance and the sealing performance of the packer rubber cylinder in a corrosive medium environment under a stress state can be tested simultaneously, and the reliability of the packer rubber cylinder is further evaluated.
Description
Technical Field
The utility model belongs to the technical field of the oil is equipped, especially, relate to a packing element is corroding reliability testing arrangement under the effect of stress.
Background
The packer is an important underground device in the process of oil and gas field exploitation, and production zone separation is realized through radial deformation of a packer rubber sleeve under load in the processes of well completion, reservoir transformation, zonal exploitation and the like. The packer is composed of a steel piece and a rubber sleeve, and the sealing performance of the rubber sleeve is of great importance to construction safety, well structure and the like. During the acidification or production process, certain corrosion and damage of the packer rubber sleeve exist by the high-temperature and high-pressure construction working fluid or formation fluid, so that the packer fails, and the integrity of a shaft is damaged. Therefore, the corrosion of the packer rubber cylinder by the test fluid under high temperature and high pressure is simulated, and the relation between the contact pressure and the sealing property of the packer rubber cylinder and the test casing in the corrosion process is clear, so that the method has important significance for the material selection and the protection of the packer rubber cylinder.
At present, a simulation test of a packer rubber cylinder under a high-temperature and high-pressure environment is a basic and important component part for reliability research of a packer, but the performance of the packer rubber cylinder is not only influenced by high temperature and high pressure, but also influenced by a complex fluid environment, and in addition, the packer rubber cylinder is in a stress state when working, so that the difficulty of the simulation test is increased to a great extent. At present, a plurality of devices are used for researching the sealing performance of the packer rubber cylinder under high temperature and high pressure, but the influence of corrosive media on the packer rubber cylinder is ignored, the device is complex, the experiment cost is high, and the reliability test of the packer rubber cylinder is inconvenient.
Aiming at the limitation of the current packer rubber tube testing device, the device for testing the reliability of the rubber tube under the action of corrosion and stress is provided, and the device has a simple structure and is easy to process, can test the contact stress between the packer rubber tube and a testing sleeve in various corrosion environments, and obtains a relation curve of the contact stress and the experimental time; after the packer rubber cylinder is assembled on a testing device, the packer rubber cylinder is directly placed in a high-temperature high-pressure multiphase flow corrosion experimental method and device (CN102654446B), so that the corrosion resistance and the sealing property of the packer rubber cylinder in a stress state can be tested simultaneously, and reference is provided for the optimized material selection and protection of the packer rubber cylinder.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for testing the reliability of a rubber sleeve under the action of corrosion and stress, which is used for testing the contact stress between the packer rubber sleeve and a sleeve under different corrosion environments to obtain a relation curve of the contact stress and the experimental time, thereby obtaining the change rule of the contact stress between the packer rubber sleeve and the sleeve in the corrosion process of the packer rubber sleeve; the corrosion resistance and the sealing performance of the packer rubber cylinder under a stress state are tested, and reference is provided for the optimized material selection and protection of the packer rubber cylinder.
The utility model adopts the following technical scheme: the utility model provides a packing element is at reliability test device under corruption and stress action which characterized in that: the device consists of a central shaft, a nut, a pressure ring, a packer rubber cylinder, a test sleeve, a square block, a concentric circle bottom plate, a high-temperature strain gauge, a high-temperature lead and a strain gauge;
the upper part of the central shaft is provided with a male thread, the middle part is provided with a smooth rod, the lower part is provided with a step with the height of 20mm, and the diameter d of the male thread1Diameter d of smoother rod24-5 mm small and smooth rod length h1Specific packer packing element thickness L110-15 mm in size;
the step surface of the central shaft and the compression ring are provided with chamfers, and the thickness L of the compression ring240-50 mm; the outer diameter d of the packer rubber cylinder4Specific test of the inner diameter d of the casing3The size is 3-5 mm;
the test sleeve is connected with the concentric round bottom plate through a welding seam A; the concentric circle bottom plate is connected with the central shaft through a welding seam B; the central shaft is connected with the square block through a welding seam C;
the high temperature foil gage totally 8 pieces to evenly paste in the interval of 45 degrees apart from test sleeve bottom L department, the high temperature foil gage passes through the external strain gauge of high temperature wire to use corrosion-resistant material encapsulation high temperature foil gage and high temperature wire, wherein L calculation mode as follows:
in the formula: l is the height from the bottom end of the test casing, mm; l is1The thickness of the packer rubber cylinder; l is3A compression moment when a packer rubber cylinder is loaded;
the nut is matched with the central shaft through threads, and is rotated downwards to apply pressure to the packer rubber cylinder through the pressure ring to form setting; the packer rubber cylinder forms a sealing cavity together with the central shaft, the test sleeve and the concentric round bottom plate after being set, and a display agent is placed in the sealing cavity; the testing device is assembled and then placed in a high-temperature high-pressure kettle.
The utility model has the advantages that:
(1) the working condition of the packer rubber cylinder in service in the well is simulated, the contact stress between the packer rubber cylinder and the test sleeve in various corrosion environments can be tested, and the change rule of the contact stress between the packer rubber cylinder and the sleeve in the corrosion process of the packer rubber cylinder is obtained; the corrosion resistance and the sealing performance of the packer rubber cylinder in a corrosive medium environment in a stress state can be tested simultaneously;
(2) simple structure, processing is easy, and the equipment is simple and easy: after the packer rubber cylinder is arranged on the central shaft, the pressure can be loaded by screwing the nut, and the setting is simulated; the device is placed in a high-temperature high-pressure kettle for testing, safety guarantee is provided by the high-temperature high-pressure kettle, and safety of a simulation experiment is improved.
Drawings
Fig. 1 is a schematic structural diagram of the packer rubber cylinder in the testing device of the present invention when it is not set.
Figure 2 is the structure schematic diagram of the packer packing element after the packing in the testing device of the utility model.
Fig. 3 is a dimension indicating diagram of each component in the testing device of the present invention.
Fig. 4 is a schematic top view of a test socket in a testing apparatus of the present invention.
Fig. 5 is a schematic top view of a square block in the testing device of the present invention.
In the figure: 1-central shaft, 2-nut, 3-pressure ring, 4-packer rubber cylinder, 5-annular cylinder, 6-welding point A, 7-welding point B, 8-welding point C, 9-square block, 10-concentric circle bottom plate, 11-high temperature strain gauge, 12-high temperature wire, 13-strain gauge, 14-sealed cavity, 15-display agent and 16-high temperature autoclave.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The utility model simulates the service working condition of the packer rubber cylinder through the high-temperature autoclave, and tests the corrosion resistance of the packer rubber cylinder during setting in a corrosive medium environment; the stress state of the packer rubber barrel during underground setting is simulated by screwing the nut to load the packer rubber barrel, the contact stress of the sleeve and the packer rubber barrel is tested by adopting a strain gauge, and the sealing performance of the packer rubber barrel in the corrosion process is tested by combining a display agent.
As shown in the attached drawing 1, for using the method, the utility model provides a rubber sleeve reliability testing device under the effect of corrosion and stress, mainly include center pin 1, nut 2, clamping ring 3, packer rubber sleeve 4, test tube 5, square 9, concentric circle bottom plate 10, high temperature foil gage 11, high temperature wire 12, strain gauge 13.
The upper part of the central shaft 1 is provided with male threads, the middle part is a smooth rod, the lower part is provided with steps with the height of 20mm, and the diameter d of the male threads1Diameter d of smoother rod24-5 mm small and smooth rod length h1Thickness L of packer rubber sleeve 4110-15 mm in size; the step surface of the central shaft 1 and the pressure ring 3 are provided with chamfers, and the thickness L of the pressure ring 3 is240-50 mm; the packer rubber sleeve 4 has an outer diameter d4Inner diameter d of casing 53The size is 3-5 mm; the packer rubber 4 forms a sealing cavity 14 with the central shaft 1, the testing casing 5 and the concentric circle bottom plate 10 after setting, and a display agent 15 is placed in the sealing cavity 14; the testing device is assembled and then placed in a high-temperature high-pressure kettle 16; the high-temperature strain gauge 11 is 8 pieces and is uniformly adhered to the bottom of the test sleeve 5 at 45-degree intervalsAt the end L, the high-temperature strain gauge 11 is externally connected with a strain gauge 13 through a high-temperature lead 12, and the high-temperature strain gauge 11 and the high-temperature lead 12 are packaged by using a corrosion-resistant material; the test sleeve 5 is connected with the concentric circle bottom plate 11 through a welding seam A; the concentric circle bottom plate 11 is connected with the central shaft 1 through a welding seam B; the central shaft 1 is connected with the square block 9 through a welding seam C.
Utilize the utility model provides a test method and device carry out contact stress and corrosion test to a compression type packer packing element in being in service in hydrogen sulfide and carbon dioxide corrosion medium, and concrete test process includes following step:
step 1: attaching high-temperature strain gauges 11 at intervals of 45 degrees to the bottom end L of the test sleeve 5, and connecting the high-temperature strain gauges 11 with a strain gauge 13 through high-temperature leads 12, as shown in the accompanying drawings 1 and 4;
step 2: fixing the square block 9, putting a display agent 15 into a space formed by the test sleeve 5 and the concentric bottom plate 10, stringing the packer rubber cylinder 4 into the central shaft 1, screwing the nut 2 to enable the press ring 3 to move downwards to compress the packer rubber cylinder 4, radially expanding and deforming the packer rubber cylinder 4 to be in contact with the inner wall of the test sleeve 5, and compressing until a set compression moment of the packer rubber cylinder 4 stops compressing, as shown in figure 2;
and step 3: the circumferential strain epsilon of the outer wall of the test casing 5 is collected by a strain gauge 13iAnd calculating the contact stress P of the test sleeve 5 and the packer rubber cylinder 4 after the packer rubber cylinder 4 is compressedi：
And 4, step 4: the compressed test unit is placed in a high temperature autoclave 16 containing corrosive media, as shown in figure 2. Heating the high-temperature autoclave 16 to the preset experimental temperature after deoxidizing, introducing carbon dioxide, hydrogen sulfide gas and nitrogen with preset contents, boosting the pressure to the preset experimental pressure, and carrying out a heat-preservation pressure-maintaining corrosion experiment;
and 5: in the corrosion experiment process, the method described in the step 3 is used for obtaining the contact stress P in the corrosion test processiPlotting contact stress PiObserving the change rule of the contact stress along with the experiment time according to the relation curve of the contact stress and the experiment time;
step 6: and taking out the testing device after 72-168 hours of experiment, and taking out the packer rubber cylinder 4 after cleaning the liquid on the upper part of the packer rubber cylinder 4. Measuring the rebound quantity of the packer rubber 4, observing the deformation condition and the morphology of the packer rubber 4, and evaluating the corrosion resistance of the packer rubber 4;
and 7: taking out the indicator 15, and evaluating the sealing performance of the packer rubber cylinder 4 in a stress state in a high-temperature high-pressure corrosion environment; and the accuracy of the result of the display agent 15 is demonstrated by combining the relation curve of the contact stress and the experimental time;
and 8: if the relationship curves of the display agent 15, the contact stress and the experiment time show that the sealing performance of the packer rubber cylinder 4 fails, the corrosion evaluation is carried out on the test casing 5: a. cutting the test sleeve 5 open, and observing the inner wall corrosion macro morphology; b. cutting a steel sheet sample at the setting contact position of the test sleeve 5 and the packer rubber cylinder 4, observing the corrosion micro-morphology of the inner wall of the test sleeve 5 by using a scanning electron microscope and an energy spectrometer, cleaning a test piece, and measuring the corrosion three-dimensional morphology and the corrosion depth of the inner wall of the test sleeve 5 by using a super depth-of-field three-dimensional microscope; c. scraping the corrosion product on the inner wall, and analyzing the corrosion product of the test sleeve 5 in the corrosion environment by using an X-ray photoelectron spectrum and an X-ray diffractometer; d. and comprehensively analyzing the corrosion influence of the failure of the packer rubber sleeve 4 on the test casing 5.
Claims (1)
1. The utility model provides a packing element is at reliability test device under corruption and stress action which characterized in that: the method mainly comprises the following steps: the device comprises a central shaft (1), a nut (2), a pressure ring (3), a packer rubber cylinder (4), a test sleeve (5), a square block (9), a concentric circle bottom plate (10), a high-temperature strain gauge (11), a high-temperature lead (12) and a strain gauge (13);
the upper part of the central shaft (1) is provided with male threads, the middle part is provided with a smooth rod, the lower part is provided with a step with the height of 20mm, and the diameter d of the male threads1Diameter d of smoother rod24-5 mm small and smooth rod length h1Is thicker than the thickness L of a packer rubber cylinder (4)110-15 mm in size;
the step surface of the central shaft (1) and the pressure ring (3) are provided with chamfers, and the thickness L of the pressure ring (3)240-50 mm; the outer diameter d of the packer rubber cylinder (4)4Inner diameter d of the casing (5) to be tested3The size is 3-5 mm;
the test sleeve (5) is connected with the concentric circle bottom plate (10) through a welding seam A (6); the concentric circle bottom plate (10) is connected with the central shaft (1) through a welding seam B (7); the central shaft (1) is connected with the square block (9) through a welding seam C (8);
the high-temperature strain gauges (11) are 8 in number and are uniformly adhered to the position L away from the bottom end of the test sleeve (5) at intervals of 45 degrees, the high-temperature strain gauges (11) are externally connected with a strain gauge (13) through high-temperature leads (12), and the high-temperature strain gauges (11) and the high-temperature leads (12) are packaged by using corrosion-resistant materials;
in the formula: l is the height from the bottom end of the test sleeve (5) in mm; l is1The thickness of the packer rubber cylinder (4); l is3A compression moment when the packer rubber cylinder (4) is loaded;
the nut (2) is matched with the central shaft (1) through threads, and the nut (2) is rotated downwards to apply pressure to the packer rubber sleeve (4) through the compression ring (3) to form setting; the packer rubber cylinder (4) forms a sealing cavity (14) with the central shaft (1), the testing casing pipe (5) and the concentric circle bottom plate (10) after setting, and a display agent (15) is placed in the sealing cavity (14); the test device is placed in a high-temperature autoclave (16) with a corrosive medium after being assembled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920534984.XU CN209945889U (en) | 2019-04-19 | 2019-04-19 | Reliability testing device for rubber cylinder under corrosion and stress action |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920534984.XU CN209945889U (en) | 2019-04-19 | 2019-04-19 | Reliability testing device for rubber cylinder under corrosion and stress action |
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| CN209945889U true CN209945889U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916731A (en) * | 2019-04-19 | 2019-06-21 | 西南石油大学 | A kind of packing element is corroding and the RTA reliability test assembly and method under stress |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109916731A (en) * | 2019-04-19 | 2019-06-21 | 西南石油大学 | A kind of packing element is corroding and the RTA reliability test assembly and method under stress |
| CN109916731B (en) * | 2019-04-19 | 2023-10-13 | 西南石油大学 | Reliability testing device and method for rubber cylinder under corrosion and stress effects |
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