Miniaturized lubrication evaluation instrument for laboratory

Abstract

The utility model discloses a small-sized lubrication evaluation instrument for a laboratory, which solves the technical problem that the test is difficult to carry out under a high-pressure condition. The device comprises a detection box and a maintenance part, the interior of the maintenance part is hollow and forms a maintenance cavity, a wear-resistant main shaft, a friction test ring, a supporting ring, a fixing frame, a friction test block and other components are arranged in the maintenance cavity, the maintenance part is provided with a pump injection pipeline connector and a high-pressure pipeline connector, and the pump injection pipeline connector is used for being connected with an external lubricant adding pipeline system; the maintenance chamber is provided with a high-pressure pipeline interface to add a lubricant into the maintenance chamber, the pumping mechanism is used for pumping the lubricant into the maintenance chamber, and the high-pressure pipeline interface is used for being connected with an external pressurization pipeline system to achieve pressurization of the maintenance chamber. The high-temperature and high-pressure testing device can achieve testing under high-temperature and high-pressure conditions, meanwhile can improve testing torque, and has the advantages of being convenient to operate, high in testing precision and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of lubrication test systems, and in particular relates to a miniaturized lubrication evaluation instrument for a laboratory. Background Art

[0002] Drilling fluid and its lubricant are important materials for drilling. Their function is to reduce the friction resistance between the well wall and the drill bit, the drill bit and the casing, and reduce the rotational torque and resistance. Their lubrication performance directly affects the drilling quality.

[0003] At present, EP extreme pressure lubrication instrument is usually used for testing. However, this instrument cannot perform experiments under conditions greater than atmospheric pressure, that is, it cannot perform tests under high pressure conditions, and the test torque is relatively low, generally not exceeding 10N·m. Therefore, the test conditions of the lubrication evaluation device in the related art are limited and need to be improved. Utility Model Content

[0004] In order to solve all or part of the above problems, the purpose of the utility model is to provide a laboratory miniaturized lubrication evaluation instrument that can realize testing under high pressure conditions, while improving the test torque and having the advantages of convenient operation and high test accuracy.

[0005] The utility model provides a laboratory miniaturized lubrication evaluation instrument, including a detection box, and the lubrication evaluation instrument also includes:

[0006] A maintenance part, arranged on the detection box, wherein the interior of the maintenance part is hollow and forms a maintenance chamber;

[0007] A wear-resistant main shaft is vertically rotatably connected in the curing chamber;

[0008] A friction test ring, fixedly sleeved on the wear-resistant main shaft;

[0009] A driving unit, disposed in the detection box and used to control the rotation of the wear-resistant main shaft;

[0010] A support ring is arranged in the curing chamber, the wear-resistant main shaft passes through the support ring, and the friction test ring is located on the inner side of the support ring;

[0011] A fixing frame, arranged on the inner wall of the supporting ring;

[0012] A friction test block is arranged on the fixing frame, the friction test block is in an arc-shaped structure and matches the friction test ring;

[0013] A control unit is disposed in the detection box and is used to control the horizontal movement of the support ring so that the friction test ring contacts the friction test block;

[0014] A pumping pipeline interface is provided on the maintenance part and is used to connect with an external lubricant adding pipeline system to add lubricant into the maintenance chamber;

[0015] A high-pressure pipeline interface is provided on the maintenance part and is used to connect with an external pressurized pipeline system to achieve pressurization of the maintenance chamber;

[0016] A control panel is arranged on the detection box, and the driving part, the control part, the pumping mechanism and the external pressurization pipeline system are respectively connected to the control panel.

[0017] Optionally, the friction test block is detachably connected to the fixing frame so as to replace the friction test block with one made of different materials.

[0018] Optionally, the maintenance unit includes:

[0019] A curing tube is fixed in the detection box, and the top end of the curing tube passes through the detection box;

[0020] A sealing cover, arranged at the top port of the curing tube;

[0021] A support seat, arranged at the bottom port of the curing tube;

[0022] The bottom end of the wear-resistant main shaft is rotatably connected to the support seat, and the top end is rotatably connected to the sealing cover.

[0023] Optionally, the sealing cover and the support seat are respectively detachably connected to the curing cylinder, and a rotating groove is provided on the sealing cover. The top end of the wear-resistant main shaft is inserted into the rotating groove and rotatably cooperates with the rotating groove. The bottom end of the wear-resistant main shaft passes through the support seat and is rotatably connected to the support seat through a straightening bearing.

[0024] Optionally, the driving unit includes:

[0025] A servo motor is fixed in the detection box;

[0026] A reducer is fixed in the detection box, and the output shaft of the servo motor is coaxially fixedly connected with the input shaft of the reducer;

[0027] A driving wheel, fixedly sleeved on the output shaft of the reducer;

[0028] The transmission wheel is fixedly sleeved on the wear-resistant main shaft, and the driving wheel is connected with the transmission wheel through a synchronous belt.

[0029] Optionally, the control unit includes:

[0030] A transmission shaft, one end of which is fixedly connected to the support ring, and the other end of which passes through the maintenance part and is horizontally slidably matched with the maintenance part, and the transmission shaft and the maintenance part are slidably sealed by a sealing ring;

[0031] The servo electric cylinder is fixed in the detection box, and the piston shaft of the servo electric cylinder is connected with the transmission shaft through a coupling.

[0032] Optionally, a tension and compression sensor is connected between the coupling and the servo electric cylinder.

[0033] Optionally, the control unit further includes:

[0034] A guide shaft, one end of which is fixedly connected to the support ring, and the other end of which passes through the maintenance part and is horizontally slidably matched with the maintenance part, and the guide shaft and the maintenance part are slidably sealed by a sealing ring;

[0035] The guide shaft and the transmission shaft are distributed on both sides of the support ring, and the guide shaft and the transmission shaft are coaxial.

[0036] Optionally, a limiting cylinder is fixedly connected to the maintenance portion, and the guide shaft is slidably matched with the limiting cylinder.

[0037] Optionally, an agitator is provided in the curing chamber, and the agitator is located below the support ring to achieve mixing and stirring of the lubricant.

[0038] It can be seen from the above technical solution that the laboratory miniaturized lubrication evaluation instrument provided by the utility model has the following advantages:

[0039] The device pressurizes the curing chamber through an external pressurized pipeline system, so that the lubrication evaluation instrument can meet the test under high pressure conditions. At the same time, the friction test block can be replaced with different materials to simulate metal-metal, metal-core, metal-mud cake and other experimental tests of lubricity evaluation.

[0040] Other features and advantages of the present invention will be described in the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0042] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0043] Figure 2 A cross-sectional view of an embodiment of the utility model;

[0044] Figure 3 It is a cross-sectional view of the maintenance portion in the embodiment of the utility model.

[0045] Description of reference numerals:

[0046] 1. Inspection box; 2. Maintenance unit; 201. Maintenance cylinder; 202. Sealing cover; 203. Support seat; 204. Rotating groove; 205. Handle; 3. Maintenance chamber; 4. Wear-resistant spindle; 5. Friction test ring; 6. Driving unit; 61. Servo motor; 62. Reducer; 63. Driving wheel; 64. Transmission wheel; 65. Synchronous belt; 7. Support ring; 8. Fixed frame; 9. Friction test block; 10. Control unit; 101. Servo electric cylinder; 102. First through hole; 103. Transmission shaft; 104. Sealing ring; 105. Coupling; 106. Tension and compression sensor; 11. Pumping pipeline interface; 12. High-pressure pipeline interface; 13. Contact force balance pressure through hole; 14. Control panel; 15. Second through hole; 16. Guide shaft; 17. Sealing ring; 18. Limiting cylinder; 19. Agitator. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other arbitrarily without conflict.

[0048] like Figure 1 , Figure 2 , Figure 3 The utility model is shown in an embodiment, in which a laboratory miniaturized lubrication evaluation instrument is disclosed, including a test box 1, a maintenance part 2 is fixedly connected to the test box 1, and the interior of the maintenance part 2 is hollow and forms a maintenance chamber 3. A wear-resistant main shaft 4 is vertically rotatably connected in the maintenance chamber 3, and a friction test ring 5 is fixedly sleeved on the wear-resistant main shaft 4. At the same time, a driving part 6 for controlling the rotation of the wear-resistant main shaft 4 is arranged in the test box 1.

[0049] In one embodiment, Figure 2 , Figure 3 As shown, a support ring 7 is provided in the curing chamber 3, the wear-resistant main shaft 4 passes through the support ring 7, and the friction test ring 5 is located on the inner side of the support ring 7. A fixing frame 8 is fixedly connected to the inner wall of the support ring 7, and a friction test block 9 is provided on the fixing frame 8. The friction test block 9 is an arc-shaped structure and matches the friction test ring 5, that is, the friction test block 9 and the friction test ring 5 can fit tightly. At the same time, a control unit 10 for controlling the horizontal movement of the support ring 7 is provided in the detection box 1, so that the friction test ring 5 contacts the friction test block 9.

[0050] In one embodiment, Figure 2 , Figure 3As shown, the maintenance part 2 is provided with a pumping pipeline interface 11, which is used to connect to an external lubricant adding pipeline system to add lubricant to the maintenance chamber 3. The maintenance part 2 is also provided with a high-pressure pipeline interface 12, which is used to connect to an external boosting pipeline system to achieve pressurization of the maintenance chamber 3, and can at least increase the pressure to 15MPa. A heating jacket is provided on the outside of the maintenance part 2, and the heating jacket can heat the maintenance chamber 3 to at least 200°C, thereby realizing testing under high temperature conditions. In this embodiment, a contact force balancing pressure through hole 13 is provided on the maintenance part 2, and the high-pressure pipeline interface 12 is coaxial with the contact force balancing pressure through hole 13.

[0051] In one embodiment, Figure 1 , Figure 2 As shown, a control panel 14 is provided on the detection box 1, and the driving unit 6, the control unit 10, the external lubricant adding pipeline system and the external boosting pipeline system are respectively connected to the control panel 14, that is, the control panel 14 can control the opening and closing of the driving unit 6, the control unit 10, the external lubricant adding pipeline system and the external boosting pipeline system to improve the convenience of operation.

[0052] In one embodiment, Figure 2 , Figure 3 As shown, the friction test block 9 is detachably connected to the fixing frame 8 to replace the friction test block 9 of different materials. In this embodiment, the friction test block 9 and the fixing frame 8 can be connected by countersunk screws, or by snap-on or other detachable connection methods. In this embodiment, the friction test ring 5 is made of high-hardness steel. By replacing the friction test block 9 of different materials, experimental tests for lubricity evaluation such as metal-metal, metal-core, and metal-mud cake can be simulated.

[0053] In one embodiment, Figure 2 , Figure 3 As shown, the curing part 2 includes a curing tube 201 fixed in the detection box 1, and the top end of the curing tube 201 passes through the detection box 1, a sealing cover 202 is threadedly connected at the top port of the curing tube 201, and a support seat 203 is detachably connected at the bottom port, that is, the sealing cover 202 and the support seat 203 jointly block the two ports of the curing tube 201, and form a curing chamber 3 between the curing tube 201, the sealing cover 202 and the support seat 203. In other embodiments, the support seat 203 can be detachably connected to the curing tube 201 by threaded connection, or by fastening components such as fastening screws.

[0054] In one embodiment, Figure 2 , Figure 3As shown, a rotation groove 204 is provided at the center of the lower surface of the sealing cover 202, and the top end of the wear-resistant main shaft 4 is inserted into the rotation groove 204 and rotates with the rotation groove 204. In this embodiment, a bearing and a rotating sealing O-ring can also be installed in the rotation groove 204 to support the wear-resistant main shaft 4, balance the pressure and seal the curing chamber 3, the purpose of which is to provide a curing environment for the simulated drilling fluid in the high temperature and high pressure state on site. At the same time, a handle 205 is fixedly connected to the sealing cover 202 to facilitate the extraction and installation of the sealing cover 202.

[0055] In one embodiment, Figure 2 , Figure 3 As shown, the bottom end of the wear-resistant main shaft 4 passes through the support seat 203 and is rotatably connected to the support seat 203 through the straightening bearing, and a rotating sealing O-ring is also arranged between the wear-resistant main shaft 4, the straightening bearing and the support seat 203, which can not only support the wear-resistant main shaft 4, but also improve the sealing effect.

[0056] In one embodiment, Figure 1 , Figure 2 As shown, the driving part 6 includes a servo motor 61 and a reducer 62 fixed in the detection box 1, and the output shaft of the servo motor 61 is coaxially fixedly connected with the input shaft of the reducer 62. A driving wheel 63 is fixedly sleeved on the output shaft of the reducer 62, and a transmission wheel 64 is fixedly sleeved at the bottom end of the wear-resistant main shaft 4, and the driving wheel 63 and the transmission wheel 64 are connected by a synchronous belt 65. In this embodiment, the servo motor 61 adopts a large torque motor to ensure that the wear-resistant main shaft 4 can output a torque of 80N·m.

[0057] In one embodiment, Figure 2 , Figure 3 As shown, the control unit 10 includes a servo electric cylinder 101 fixed in the detection box 1, a first through hole 102 is opened on the curing tube 201, a transmission shaft 103 is horizontally slidably penetrated in the first through hole 102, one end of the transmission shaft 103 is fixedly connected to the support ring 7, and the other end is connected to the piston shaft of the servo electric cylinder 101 through a coupling 105. At the same time, a sealing ring 104 is arranged between the transmission shaft 103 and the first through hole 102 to achieve a seal between the two. A tension and compression sensor 106 is also connected between the coupling 105 and the servo electric cylinder 101 to achieve pressure detection. In this embodiment, the force of the servo electric cylinder 101 is greater than 1500N, so that the friction test block 9 and the friction test ring 5 can be tested under the characteristic condition of 1500N contact force.

[0058] The servo electric cylinder 101 is used as the actuator of the push-pull function in the contact force instrument, the tension and compression sensor 106 is used as the force measuring element in the contact force instrument, and the coupling 105 is used as a connecting device to ensure the concentricity of the transmission shaft 103 and other components. The servo electric cylinder 101 pushes the friction test block 9 and the friction test ring 5 to contact, and the tension and compression sensor 106 measures the contact force between the friction test block 9 and the friction test ring 5, that is, the positive pressure. In this embodiment, the fixed frame 8 can also be installed with a sand disk for filtration to meet the friction measurement experiments of metal-metal, metal-mud cake, and metal-rock.

[0059] In one embodiment, Figure 2 , Figure 3 As shown, a second through hole 15 is provided on the curing tube 201, and a guide shaft 16 is horizontally slidably penetrated in the second through hole 15, and the guide shaft 16 is fixedly connected to the support ring 7. The guide shaft 16 and the transmission shaft 103 are distributed on both sides of the support ring 7, and the guide shaft 16 and the transmission shaft 103 are coaxial, so that the support ring 7 can slide smoothly. At the same time, a sealing ring 17 is provided between the guide shaft 16 and the second through hole 15 to improve the sealing effect between the two.

[0060] In one embodiment, Figure 3 As shown, the curing cylinder 201 is fixedly connected with the limiting cylinder 18, and the guide shaft 16 is located inside the limiting cylinder 18 and slidably cooperates with the limiting cylinder 18 to support and straighten the guide shaft 16. At the same time, a sealing rubber ring is fixedly sleeved on the guide shaft 16 to improve the sealing effect between the guide shaft 16 and the limiting cylinder 18.

[0061] In one embodiment, Figure 1 , Figure 2 As shown, a stirrer 19 is provided in the curing chamber 3 and is located below the support ring 7 to achieve mixing and stirring of the lubricant so that it remains uniform during the curing process and prevents sedimentation.

[0062] The laboratory miniaturized lubrication evaluation instrument in this embodiment has the function of simulating the 200°C high temperature and 15MPa high pressure environment when simulating the actual use of drilling fluid indoors. The 80N·m torque provides a wider range of simulated rotation conditions, and the 1500N contact force characteristic further improves the test conditions, reducing the constraints of laboratory simulation field conditions.

[0063] At the same time, the device is capable of injecting lubricant under high pressure conditions, and the accuracy of injecting lubricant can reach 0.01ml, and the volume is less than 800mm×500mm×800mm. It requires less medium, and only 350ml-400ml is needed to meet experimental tests.

[0064] Moreover, the device is easy to operate and is equipped with a replaceable friction test block 9. The selection of the arc-shaped friction test block 9 is more in line with the actual use on site, and friction test blocks 9 of different materials are provided for simulating metal-metal, metal-core, metal-mud cake and other experimental tests for lubricity evaluation.

[0065] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by technicians in the field to which the present invention belongs.

[0066] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A laboratory miniaturized lubrication evaluation instrument, comprising a detection box (1), characterized in that: The lubrication evaluation instrument also includes: A curing portion (2) is arranged on the detection box (1), the interior of the curing portion (2) being hollow and forming a curing chamber (3); A wear-resistant main shaft (4) is vertically rotatably connected to the curing chamber (3); A friction test ring (5) is fixedly sleeved on the wear-resistant main shaft (4); A driving unit (6) is arranged in the detection box (1) and is used to control the rotation of the wear-resistant main shaft (4); A support ring (7) is arranged in the curing chamber (3), the wear-resistant main shaft (4) passes through the support ring (7), and the friction test ring (5) is located on the inner side of the support ring (7); A fixing frame (8) is arranged on the inner wall of the supporting ring (7); A friction test block (9) is arranged on the fixing frame (8), the friction test block (9) is in an arc-shaped structure and matches the friction test ring (5); A control unit (10) is arranged in the detection box (1) and is used to control the horizontal movement of the support ring (7) so that the friction test ring (5) contacts the friction test block (9); A pumping pipeline interface (11) is arranged on the maintenance part (2) and is used to connect to an external lubricant adding pipeline system so as to add lubricant into the maintenance chamber (3); A high-pressure pipeline interface (12) is arranged on the maintenance portion (2) and is used to connect to an external pressurizing pipeline system to achieve pressurization of the maintenance chamber (3); A control panel (14) is arranged on the detection box (1); the drive unit (6), the control unit (10), the external lubricant adding pipeline system and the external boosting pipeline system are respectively connected to the control panel (14).

2. The laboratory miniaturized lubrication evaluation instrument according to claim 1, characterized in that: The friction test block (9) is detachably connected to the fixing frame (8) so as to replace the friction test block (9) with a different material.

3. The laboratory miniaturized lubrication evaluation instrument according to claim 1, characterized in that: The maintenance part (2) comprises: A curing tube (201) is fixed in the detection box (1), and the top end of the curing tube (201) passes through the detection box (1); A sealing cover (202) is arranged at the top port of the curing tube (201); A support seat (203) is arranged at the bottom port of the curing tube (201); The bottom end of the wear-resistant main shaft (4) is rotatably connected to the support seat (203), and the top end is rotatably connected to the sealing cover (202).

4. The laboratory miniaturized lubrication evaluation instrument according to claim 3, characterized in that: The sealing cover (202) and the support seat (203) are respectively detachably connected to the curing tube (201); a rotation groove (204) is provided on the sealing cover (202); the top end of the wear-resistant main shaft (4) is inserted into the rotation groove (204) and rotatably cooperates with the rotation groove (204); the bottom end of the wear-resistant main shaft (4) passes through the support seat (203) and is rotatably connected to the support seat (203) via a straightening bearing.

5. The laboratory miniaturized lubrication evaluation instrument according to claim 4, characterized in that: The driving unit (6) comprises: A servo motor (61) is fixed in the detection box (1); A reducer (62) is fixed in the detection box (1), and the output shaft of the servo motor (61) is coaxially fixedly connected with the input shaft of the reducer (62); A driving wheel (63) is fixedly sleeved on the output shaft of the reducer (62); The transmission wheel (64) is fixedly sleeved on the wear-resistant main shaft (4), and the driving wheel (63) is connected to the transmission wheel (64) via a synchronous belt (65).

6. The laboratory miniaturized lubrication evaluation instrument according to claim 1, characterized in that: The control unit (10) comprises: A transmission shaft (103), one end of which is fixedly connected to the support ring (7), and the other end of which passes through the maintenance portion (2) and is horizontally slidably matched with the maintenance portion (2), and the transmission shaft (103) and the maintenance portion (2) are slidably sealed via a sealing ring (104); The servo electric cylinder (101) is fixed in the detection box (1), and the piston shaft of the servo electric cylinder (101) is connected to the transmission shaft (103) via a coupling (105).

7. The laboratory miniaturized lubrication evaluation instrument according to claim 6, characterized in that: A tension and compression sensor (106) is connected between the coupling (105) and the servo electric cylinder (101).

8. The laboratory miniaturized lubrication evaluation instrument according to claim 6, characterized in that: The control unit (10) further includes: A guide shaft (16), one end of which is fixedly connected to the support ring (7), and the other end of which passes through the maintenance portion (2) and is horizontally slidably matched with the maintenance portion (2), and the guide shaft (16) and the maintenance portion (2) are slidably sealed via a sealing ring (17); The guide shaft (16) and the transmission shaft (103) are distributed on both sides of the support ring (7), and the guide shaft (16) and the transmission shaft (103) are coaxial.

9. The laboratory miniaturized lubrication evaluation instrument according to claim 8, characterized in that: The maintenance portion (2) is fixedly connected to a limiting cylinder (18), and the guide shaft (16) is slidably matched with the limiting cylinder (18).

10. The laboratory miniaturized lubrication evaluation instrument according to claim 1, characterized in that: The curing chamber (3) is provided with a stirrer (19), and the stirrer (19) is located below the support ring (7) to achieve mixing and stirring of the lubricant.

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