A consistometer for detecting the performance of high-quality oil well cement

Abstract

This application discloses a thickener for testing the performance of high-quality oil well cement, including an operating table with an oil storage system and a test vessel mounted on it. The oil storage system and the test vessel are connected by an oil circuit system. A hydraulic pump is installed at the oil inlet of the test vessel, and a filter is installed at the oil outlet. An oil discharge system is also installed on the test vessel, and a test component is installed inside the test vessel, with a potentiometer mounted on the test component. This application, through modifications to the thickener, shortens the testing environment, allowing the cement slurry to quickly reach the pressure and temperature required for testing. After testing, it can also quickly depressurize and recover the high-pressure oil, thus quickly removing the cement slurry for cleaning and reducing cleaning difficulty. The pressure-bearing components of this application are made of non-metallic materials, reducing internal corrosion, and the high-quality pressurized oil further improves the measurement accuracy under high temperature and high pressure.

Description

Technical Field

[0001] This utility model relates to the field of oil well cement testing technology, and in particular to a thickening instrument for testing the performance of high-quality oil well cement. Background Technology

[0002] Cementing cement is a special type of cement used in oil, gas drilling, and geothermal well engineering to seal the annular space between the casing and the wellbore. Its core functions are to support the casing, isolate the formation, prevent fluid cross-flow, and ensure the integrity and long-term stability of the wellbore. Therefore, its performance is directly related to the wellbore's lifespan and safety.

[0003] In the further development of oil and gas exploration into deeper and ultra-deep formations, the complex internal environment, often accompanied by high temperature and high pressure, presents challenges to cementing engineering, including deterioration of cement slurry rheological properties, instability of thickening time, and failure caused by long-term sealing. Therefore, it is necessary to develop high-quality special cements to address these issues. The development process mainly involves two aspects: cement technology development and laboratory simulation. A realistic environmental simulation can accurately reflect cement performance. A thickener is an indispensable piece of equipment in the testing process. Traditional thickeners suffer from poor pressurization effects, require proper installation before activation, and the potentiometer's transmission is inaccurate due to prolonged high pressure, high temperature, and oil-water corrosion. Therefore, we propose a thickener for testing the performance of high-quality oil well cement to solve these problems. Utility Model Content

[0004] This application provides a thickener for testing the performance of high-quality oil well cement, which solves the problems of large measurement errors and long testing cycles in traditional thickeners, and can be further optimized.

[0005] This application provides a thickening instrument for testing the performance of high-quality oil well cement, including an operating table. An oil storage system and a test vessel are installed on the operating table. The oil storage system and the test vessel are connected by an oil circuit system. A hydraulic pump is installed at the oil inlet of the test vessel, and a filter mechanism is installed at the oil outlet of the test vessel. An oil discharge system is also installed on the test vessel. A test component is installed inside the test vessel, and a potentiometer is provided on the test component. The transmission bearing of the potentiometer is a ceramic bearing.

[0006] Preferably, the oil storage system includes an oil storage tank, a heating coil is installed inside the oil storage tank, and a pressure regulating valve is installed on the top of the oil storage tank.

[0007] Preferably, the oil discharge system includes an air pump with an air pipe installed on it, and the air pipe is connected to the test vessel.

[0008] Preferably, the oil circuit system includes an oil storage tank pipe installed at the bottom of the oil storage system and a test vessel pipe installed at the bottom of the test vessel body. The oil storage tank pipe is connected to an oil storage tank outlet pipe and an oil storage tank return pipe via a three-way valve. The oil storage tank outlet pipe is connected to the hydraulic pump, and the oil storage tank return pipe is connected to the filter mechanism. The test vessel pipe is connected to a test vessel inlet pipe and a test vessel outlet pipe via a three-way valve. The test vessel inlet pipe is connected to the hydraulic pump, and the test vessel outlet pipe is connected to the filter mechanism.

[0009] Preferably, the filtration mechanism includes a buffer tank and a filter cartridge screwed onto the buffer tank, the oil outlet pipe of the test vessel is connected to the buffer tank, and the oil return pipe of the oil storage tank is connected to the filter cartridge.

[0010] Preferably, the test vessel is provided with a heat preservation cavity, and a heat preservation coil is installed in the heat preservation cavity.

[0011] Preferably, the test assembly includes a slurry cup with open ends. An upper cover and a lower cover are threaded onto the upper and lower ends of the slurry cup, respectively. The lower cover is provided with a corresponding screw that corresponds to the drive positioning hole of the test vessel. A non-metallic sealing ring, a sealing diaphragm, and a pressure cap are sequentially provided between the upper cover and the slurry cup. A test mechanism is also provided inside the slurry cup.

[0012] Preferably, the testing mechanism includes a rotating shaft, a frame-type blade mounted on the rotating shaft, and a horizontal blade, wherein the horizontal blade is located inside the frame-type blade, and the rotating shaft passes through the upper cover and corresponds to the potentiometer.

[0013] Preferably, the non-metallic sealing ring is made of fluororubber.

[0014] Preferably, the ceramic bearing is a zirconia ceramic bearing.

[0015] As can be seen from the above technical solution, this application provides a thickening instrument for testing the performance of high-quality oil well cement. In use, the pressurized oil in the oil storage system is first preheated to the test temperature. Then, the test cement slurry is loaded into the test component and installed into the test vessel. The test vessel is sealed with a sealing cap on the operating table. Pressurized oil is pumped into the test vessel using a hydraulic pump until it leaks from the sealing cap on the operating table. A thermometer is then installed, and the test vessel is completely sealed. The hydraulic pump is started to reach the set pressure and maintain it. The equipment is then started for testing. After the test is completed, the oil circuit system of the test vessel is switched to the return oil pipeline. The high-pressure oil is filtered by the filter mechanism and then flows back into the oil storage system. When the pressure in the test vessel is insufficient, the oil draining system is started to accelerate the draining of oil. After the pressurized oil is drained, the test vessel is opened, and the test component is removed for cleaning.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. Through the oil storage system and oil circuit system, the pressurized oil can be preheated before using the equipment, which improves the system response speed. In addition, this application can quickly complete the refueling work through the hydraulic pump and can provide a large oil pressure to simulate the high pressure and ultra-high pressure working environment, so as to make its simulation effect better.

[0018] 2. Through the setting of the filtration mechanism and oil drainage system, the oil drainage work can be completed quickly after the test, which speeds up the cleaning time of cement slurry, reduces the solidification of slurry, facilitates cleaning, and can perform certain filtration during the oil drainage process, improve the quality of high-pressure oil, thereby reducing the impact on the transmission bearing and improving its measurement accuracy.

[0019] 3. By using non-metallic bearings and other pressure-bearing components, corrosion and deformation under high temperature and high pressure environments can be reduced, which not only improves measurement accuracy but also extends the service life of the components.

[0020] In summary, this application, through modifications to the thickener, can shorten the testing environment, enabling the cement slurry to quickly reach the pressure and temperature required for testing. After testing, it can also quickly depressurize and recover the high-pressure oil, thus allowing for rapid removal of the cement slurry for cleaning and reducing cleaning difficulty. The pressure-bearing components of this application are made of non-metallic materials, reducing internal corrosion, and the high-quality pressurizing oil further improves the measurement accuracy under high temperature and high pressure. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a thickening instrument for testing the performance of high-quality oil well cement proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the test component structure of a thickener for detecting the performance of high-quality oil well cement, as proposed in this utility model.

[0024] Figure 3 This is a schematic diagram of the oil circuit system structure of a thickener for testing the performance of high-quality oil well cement, as proposed in this utility model.

[0025] Figure 4This is a schematic diagram of the internal structure of a thickener for testing the performance of high-quality oil well cement, as proposed in this utility model.

[0026] Figure 5 This is a schematic diagram of the testing mechanism of a thickening instrument for detecting the performance of high-quality oil well cement, as proposed in this utility model.

[0027] In the diagram: 1. Operating platform; 2. Oil storage system; 21. Oil storage tank; 22. Heating coil; 23. Pressure stabilizing valve; 3. Oil discharge system; 31. Air pump; 32. Air pipe; 4. Oil circuit system; 41. Oil pipe of oil storage tank; 42. Oil outlet pipe of oil storage tank; 43. Oil return pipe of oil storage tank; 44. Oil pipe of test vessel; 45. Oil inlet pipe of test vessel; 46. Oil outlet pipe of test vessel; 5. Hydraulic pump; 6. Filtration mechanism; 61. Buffer tank; 62. Filter cartridge; 7. Test vessel body; 71. Insulation cavity; 72. Insulation coil; 8. Slurry cup; 9. Test mechanism; 91. Rotating shaft; 92. Frame-type blade; 93. Horizontal blade; 10. Lower cover; 11. Non-metallic sealing ring; 12. Sealing diaphragm; 13. Pressure cap; 14. Upper cover; 15. Potentiometer; 151. Ceramic bearing. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0029] See Figure 1-5 This application discloses a thickening instrument for testing the performance of high-quality oil well cement. It is used for performance testing of high-pressure and ultra-high-pressure high-quality oil well cement, enabling rapid testing and further reducing system errors during the testing process, thus improving the accuracy of measurement data. Specifically, it includes an operating table 1 for controlling the specific adjustments of each system. The operating table 1 is equipped with an oil storage system 2 and a test vessel 7, which are connected via an oil circuit system 4. The oil circuit system 4 enables the high-pressure oil between the oil storage system 2 and the test vessel 7 to circulate and achieve rapid switching, thereby improving testing efficiency. Furthermore, the oil circuit system 4 of this application has a hydraulic pump 5 installed at the oil inlet of the test vessel 7. Using the hydraulic pump 5 for pressure supply not only has high efficiency but also simulates higher pressure conditions, with a higher simulation upper limit and faster response speed.

[0030] Because some cement impurities may not be completely cleaned during the testing process and enter the test vessel 7, causing these impurities to enter the bearings and affect the test results, a filter mechanism 6 is installed at the oil outlet of the test vessel 7 in the oil circuit system 4. When the oil returns after the test, it can filter the high-pressure oil under high pressure to improve its quality, thereby extending its service life and avoiding frequent replacements. Furthermore, an oil draining system 3 is also installed on the test vessel 7. When the oil in the test vessel 7 cannot be completely drained, the oil draining system 3 can assist in draining the oil, improving the draining efficiency and further reducing the test cycle. It also assists in filtration. A test assembly is installed inside the test vessel 7 to hold the test cement slurry. The test assembly is equipped with a potentiometer 15, and the transmission bearing of the potentiometer 15 is a ceramic bearing 151. Compared with traditional metal bearings, ceramic bearings 151 are less prone to corrosion in high-temperature environments, resulting in higher measurement accuracy. Furthermore, the ceramic bearing 151 is a zirconia ceramic bearing with a Vickers hardness of 1300 HV and a corrosion resistance rating of ISO. The C5 grade of the 9227 standard is superior to traditional metal bearings and has a longer service life, thereby improving measurement accuracy while reducing costs.

[0031] In this utility model, the oil storage system 2 includes an oil storage tank 21, and a heating coil 22 is installed inside the oil storage tank 21. In this application, the oil storage system 2 can be preheated before testing. After installation, oil can be supplied and pressure is applied directly to conduct testing, thereby improving testing efficiency. Pressure fluctuations will occur in the oil storage tank 21 during the high-pressure oil return and heating process. Therefore, a pressure stabilizing valve 23 is installed on the top of the oil storage tank 21 to regulate the pressure balance inside the oil storage tank 21 and ensure the normal operation of oil supply and return.

[0032] In this invention, the oil drainage system 3 includes an air pump 31, on which an air pipe 32 is installed. The air pipe 32 is connected to the test vessel 7. When the pressure in the test vessel 7 is insufficient during the oil drainage process, the air pump 31 can pressurize the test vessel 7 to increase its internal pressure, accelerate the oil drainage, and improve the oil drainage work after the measurement is completed. This allows the sample to be quickly removed for cleaning after the experiment, avoiding the cement slurry from solidifying due to excessive time, which would increase the difficulty of cleaning.

[0033] In this invention, the oil circuit system includes an oil tank pipe 41 installed at the bottom of the oil storage system 2 and a test vessel pipe 44 installed at the bottom of the test vessel body 7. This application installs the test vessel pipe 44 at the bottom of the test vessel body 7. During oil supply, this reduces the upward movement of particles, thereby reducing the likelihood of particles entering the upper ceramic bearing 151 and improving detection accuracy. Further oil discharge also occurs through this pipe, allowing the removal of particles deposited at the bottom for filtration. The oil tank pipe 41 is connected to an oil tank outlet pipe 42 and an oil tank return pipe 44 via a three-way valve. Oil pipe 43 and oil tank outlet pipe 42 are connected to hydraulic pump 5. Oil tank return pipe 43 is connected to filter mechanism 6. Test vessel oil pipe 44 is equipped with test vessel inlet pipe 45 and test vessel outlet pipe 46 through a three-way valve. Test vessel inlet pipe 45 is connected to hydraulic pump 5, and test vessel outlet pipe 46 is connected to filter mechanism 6. The three-way valve realizes the actions of oil discharge, oil supply and shut-off. The oil discharge and oil supply processes are all carried out through oil tank oil pipe 41 and test vessel oil pipe 44, and then the three-way valve is used for specific division, realizing the process of adding oil, pressurizing, returning oil and process.

[0034] In this utility model, the filtration mechanism 6 includes a buffer tank 61 and a filter cartridge 62 screwed onto the buffer tank 61. The filter cartridge 62 can be disassembled for cleaning. The oil outlet pipe 46 of the test vessel is connected to the buffer tank 61, and the oil return pipe 43 of the oil storage tank is connected to the filter cartridge 62. The oil from the oil outlet pipe 46 of the test vessel enters the buffer tank 61, is filtered by the filter cartridge 62, and then returns to the oil storage tank through the oil return pipe 43.

[0035] In this invention, a heat-insulating cavity 71 is provided inside the test vessel 7, a heat-conducting medium is provided inside the heat-insulating cavity 71, and a heat-insulating coil 72 is installed inside the heat-insulating cavity 71. During the test, the temperature inside the test vessel 7 is maintained by the heat-insulating coil 72.

[0036] In this invention, the testing component includes a slurry cup 8 with open ends. An upper cover 14 and a lower cover 10 are threaded onto the upper and lower ends of the slurry cup 8, respectively. The lower cover 10 has corresponding screws that correspond to the driving positioning holes of the testing vessel. When pouring cement slurry, the lower cover 10 is screwed into the slurry cup 8, the testing mechanism 9 is installed, and then cement slurry is added. A non-metallic sealing ring 11, a sealing diaphragm 12, and a pressure cap 13 are sequentially arranged between the upper cover 14 and the slurry cup 8. The non-metallic sealing ring 11 is made of fluororubber, with a temperature resistance of -20℃ to 250℃ and a pressure resistance of 100MPa, achieving a dynamic sealing life of over 2000 hours. The testing mechanism 9 is also installed inside the slurry cup 8. The non-metallic sealing ring 11, sealing diaphragm 12, pressure cap 13, and upper cover 14 are then sequentially installed. It is worth noting that the cement slurry must fill the entire slurry cup 8.

[0037] In this utility model, the testing mechanism 9 includes a rotating shaft 91, a frame-type blade 92 mounted on the rotating shaft 91, and a horizontal blade 93. During testing, the horizontal blade 93 is 2-3mm away from the cup of the paddle cup 8, which can reduce the situation of sticking to the wall and solidifying, and facilitate quick cleaning. The horizontal blade 93 is located inside the frame-type blade 92. The rotating shaft 91 passes through the upper cover 14 and corresponds to the potentiometer 15. During the rotation of the paddle cup 8, the force is transmitted to the potentiometer 15 through the rotating shaft 91 for measurement.

[0038] As can be seen from the above technical solution, when using this application, the pressurized oil in the oil storage system 2 is first preheated to reach the test temperature, then the test cement slurry is loaded into the test component, and then installed into the test vessel 7. The test vessel 7 is sealed by the sealing cover on the operating table 1. Pressurized oil is pumped into the test vessel 7 by the hydraulic pump 5 until it leaks from the sealing cover on the operating table 1. A thermometer is installed, the test vessel 7 is completely sealed, the hydraulic pump 5 is started to reach the set pressure and maintain it, and the equipment is started for testing. After the test is completed, the oil circuit system 4 of the test vessel 7 is switched to the return oil pipeline. The high-pressure oil is filtered by the filter mechanism 6 and then flows back into the oil storage system 2. When the pressure of the test vessel 7 is insufficient, the oil discharge system 3 is started to accelerate the oil discharge. After the pressurized oil is drained, the test vessel 7 is opened and the test component is taken out for cleaning.

[0039] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0040] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A thickening instrument for testing the properties of high-quality oil well cement, comprising an operating table (1), characterized in that: The operating table (1) is equipped with an oil storage system (2) and a test vessel (7). The oil storage system (2) and the test vessel (7) are connected by an oil circuit system (4). A hydraulic pump (5) is installed at the oil inlet end of the test vessel (7) of the oil circuit system (4). A filter mechanism (6) is installed at the oil outlet end of the test vessel (7) of the oil circuit system (4). An oil discharge system (3) is also installed on the test vessel (7). A test component is installed inside the test vessel (7). A potentiometer (15) is installed on the test component. The transmission bearing of the potentiometer (15) is a ceramic bearing (151).

2. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The oil storage system (2) includes an oil storage tank (21), a heating coil (22) is installed inside the oil storage tank (21), and a pressure regulating valve (23) is installed on the top of the oil storage tank (21).

3. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The oil discharge system (3) includes an air pump (31) with an air pipe (32) installed on it, and the air pipe (32) is connected to the test vessel (7).

4. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The oil circuit system includes an oil tank pipe (41) installed at the bottom of the oil storage system (2) and a test vessel pipe (44) installed at the bottom of the test vessel body (7). The oil tank pipe (41) is equipped with an oil tank outlet pipe (42) and an oil tank return pipe (43) through a three-way valve. The oil tank outlet pipe (42) is connected to the hydraulic pump (5), and the oil tank return pipe (43) is connected to the filter mechanism (6). The test vessel pipe (44) is equipped with a test vessel inlet pipe (45) and a test vessel outlet pipe (46) through a three-way valve. The test vessel inlet pipe (45) is connected to the hydraulic pump (5), and the test vessel outlet pipe (46) is connected to the filter mechanism (6).

5. A thickening instrument for testing the properties of high-quality oil well cement according to claim 4, characterized in that, The filtration mechanism (6) includes a buffer tank (61) and a filter cartridge (62) screwed onto the buffer tank (61). The oil outlet pipe (46) of the test vessel is connected to the buffer tank (61), and the oil return pipe (43) of the oil storage tank is connected to the filter cartridge (62).

6. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The test vessel body (7) is provided with a heat preservation cavity (71), and a heat preservation coil (72) is installed in the heat preservation cavity (71).

7. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The test assembly includes a slurry cup (8), which has open ends. An upper cover (14) and a lower cover (10) are threaded onto the upper and lower ends of the slurry cup (8), respectively. The lower cover (10) is provided with a corresponding screw that corresponds to the drive positioning hole of the test vessel. A non-metallic sealing ring (11), a sealing diaphragm (12), and a pressure cap (13) are also arranged sequentially between the upper cover (14) and the slurry cup (8). A test mechanism (9) is also provided inside the slurry cup (8).

8. A thickening instrument for testing the properties of high-quality oil well cement according to claim 7, characterized in that, The testing mechanism (9) includes a rotating shaft (91), a frame blade (92) mounted on the rotating shaft (91), and a horizontal blade (93). The horizontal blade (93) is located inside the frame blade (92). The rotating shaft (91) passes through the upper cover (14) and corresponds to the potentiometer (15).

9. A thickening instrument for testing the properties of high-quality oil well cement according to claim 7, characterized in that, The non-metallic sealing ring (11) is made of fluororubber.

10. A thickening instrument for testing the properties of high-quality oil well cement according to claim 1, characterized in that, The ceramic bearing (151) is a zirconia ceramic bearing.

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