Drill string vibration simulation test system

Abstract

The invention relates to the technical field of petroleum drilling, and discloses a drill string vibration simulation test system which comprises a detection table, a driving motor, a drill chuck, a simulation wellbore, a drill string, an axial force applying device and a detection system, the detection table is rectangular, one end of the detection table is provided with the driving motor, and the driving motor is connected with a speed regulator; the drill chuck is connected with an output shaft of the driving motor through a coupler, the simulation wellbore is horizontally installed on the portion, on the rear side of the drill chuck, of the detection table through a retainer, the simulation wellbore and the drill chuck are coaxially arranged, the drill column is rotatably sleeved with the simulation wellbore through a stabilizer, and one end of the drill column is connected with the drill chuck. The other end of the drill column is connected with an axial force applying device installed at the tail end of the detection table, a plurality of sensors for detecting the vibration characteristics of the drill column in real time are installed on the simulation shaft, and the sensors are connected with a detection system. According to the invention, friction generated by mutual friction between the drill column and the rock debris and vibration generated by mutual collision between the drill column movement and the rock debris and the shaft can be rapidly established and simulated.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, in particular to a drill string vibration simulation test system. Background Art

[0002] The demand for oil and gas exploration and development is the indicator of the development of drilling projects and the biggest driving force for the advancement of drilling technology. During the drilling process, the drill string vibrates and buckles, and the actual contact between the drill string at the bottom of the well and the well wall is difficult to obtain. In addition, the longer the horizontal drill string is, the greater the vibration caused by the friction between the drill string and the cuttings generated in the wellbore, and the more difficult it is to control the drilling direction of the drill bit. The application number is: 202410611140.6, which discloses an indoor experimental method and device for measuring the friction between the drill string and the rock bed. The patent discloses the use of a displacement motor to simulate the friction resistance generated by the movement of the drill pipe and the cuttings, and then uses a data acquisition module to analyze the friction resistance of the drill string. It has the advantages of being able to simulate actual working conditions, clarify the influencing factors of the friction resistance of the drill string during drilling, accurately predict the height of the cuttings bed during drilling, and reduce the friction resistance between the drill pipe and the cuttings bed. However, it can only analyze the influencing factors of the friction resistance of the drill string. In actual drilling projects, the actual contact between the bottom drill string and the well wall is complicated, and the vibration generated by the mutual movement of the drill string and the cuttings also has a serious impact on its work and cannot be avoided. Especially in some scenes with high precision requirements, it is often necessary to consider the friction resistance generated by the friction between the drill string under pressure and the cuttings and the vibration generated by the collision between the drill string movement and the cuttings and the wellbore. Therefore, a method is needed to simulate the collision between the drill string and the well wall according to the vibration of the drill string. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the background technology and provide a drill string vibration simulation test system, which can observe the contact and collision between the drill string and the well wall according to the vibration of the drill string to avoid avoidable problems.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A drill string vibration simulation test system comprises a test bench, a drive motor, a drill chuck, a simulated wellbore, a drill string, an axial force applying device and a test system, wherein the test bench is rectangular, a drive motor is installed at one end of the test bench, a speed regulator is connected to the drive motor, the drill chuck is connected to the output shaft of the drive motor through a coupling, the simulated wellbore is horizontally installed on the test bench at the rear side of the drill chuck through a retaining frame, the simulated wellbore and the drill chuck are coaxially arranged, the drill string is rotatably mounted in the simulated wellbore through a stabilizer, one end of the drill string is connected to the drill chuck, and the other end of the drill string is connected to the axial force applying device installed at the end of the test bench, a plurality of sensors for real-time detection of the vibration characteristics of the drill string are installed on the simulated wellbore, and the plurality of sensors are connected to the test system.

[0006] The stabilizer includes a sealing end cover, a fixed convex frame, a fixed concave frame and a bearing. The sealing end covers of the two stabilizers are fixedly installed at both ends of the simulated wellbore, the fixed convex frame is installed on the drill string, the bearing is sleeved on the fixed convex frame, the fixed concave frame is installed on the outside of the bearing, and the fixed concave frame is connected to the retaining frame.

[0007] The retaining frame includes a lower bracket, a gasket, an upper cover and bolts. The upper cover is connected to the top of the lower bracket through the gasket. A limiting portion adapted to the contour of the simulated wellbore or stabilizer is processed between the upper cover and the lower bracket. The upper cover is fixedly connected to the lower bracket by bolts, and the bottom of the lower bracket is connected to the inspection platform by bolts.

[0008] The axial force applying device includes a rock formation simulation frame, a planar push rod and a thrust spring. The two rock formation simulation frames are fixed on the detection table. The planar push rod vertically passes through the two rock formation simulation frames and can slide back and forth between the two rock formation simulation frames. One end of the planar push rod is in contact with the drill string. The thrust spring is sleeved on the planar push rod near one end of the drill string.

[0009] The sensor includes a base, a magnetic sheet, a detection component, a transmission line and a retaining ring. The base is mounted on the outer end of the simulated wellbore, and both ends of the base are fixed to the simulated wellbore through the retaining ring. The detection component is connected to the base through the magnetic sheet, and the detection component uses the transmission line to transmit the detection data to the detection system.

[0010] The detection system includes a data collector, a data line and a computer. The data collector receives data collected by multiple sensors and transmits the data to the computer through the data line, and generates a frequency spectrum using software installed in the computer.

[0011] The drill string vibration simulation test system provided by the present invention has the following beneficial effects:

[0012] (1) The friction resistance generated by the friction between the drill string and the cuttings and the vibration generated by the collision between the drill string movement and the cuttings and the wellbore can be quickly built by driving the motor, drill chuck, simulated wellbore, drill string and axial force application device. In addition, the size and speed of the drill string can be quickly changed, thereby increasing the test range;

[0013] (2) By setting a speed regulator to control the speed of the drive motor, the speed can be easily adjusted, thereby increasing the scope of application;

[0014] (3) By setting up an axial force applying device, the axial force applied by the rock formation on the rotating rod at the end of the drill string can be simulated, which can make the entire experimental results more accurate;

[0015] (4) By setting up sensors and detection systems, the vibration characteristics of the drill string can be detected in real time, realizing intuitive visualization of data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention.

[0018] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present invention.

[0019] Figure 3 A schematic diagram of the connection between a drive motor and a drill chuck provided in an embodiment of the present invention.

[0020] Figure 4 A schematic diagram of the structure of a stabilizer provided in an embodiment of the present invention.

[0021] Figure 5 A schematic structural diagram of a retaining frame provided in an embodiment of the present invention.

[0022] Figure 6 A schematic structural diagram of an axial force applying device provided in an embodiment of the present invention.

[0023] Figure 7 A schematic diagram of the structure of a sensor provided in an embodiment of the present invention.

[0024] Figure 8 A control block diagram provided for an embodiment of the present invention.

[0025] 1. Test bench; 2. Drive motor; 21. Speed ​​regulator; 3. Drill chuck; 4. Simulated wellbore; 5. Drill string; 6. Axial force applying device; 61. Rock formation simulation frame; 62. Plane push rod; 63. Thrust spring; 7. Sensor; 71. Base; 72. Magnetic sheet; 73. Test assembly; 74. Transmission line; 75. Retaining ring; 8. Test system; 81. Collector; 82. Data line; 83. Computer; 9. Stabilizer; 91. Sealing end cover; 92. Fixed protrusion; 93. Fixed recess; 94. Bearing; 10. Retaining frame; 101. Lower bracket; 102. Washer; 103. Upper cover; 104. Bolt. DETAILED DESCRIPTION

[0026] Example

[0027] like Figures 1 to 8As shown, the drill string 5 vibration simulation test system provided in this embodiment includes a test platform 1, a drive motor 2, a drill chuck 3, a simulated wellbore 4, a drill string 5, an axial force applying device 6 and a detection system 8. The test platform 1 is rectangular, and the test platform 1 is a long frame shape spliced ​​by aluminum profiles, angle codes, and gaskets. The drive motor 2 is installed at one end of the test platform 1, and the drive motor 2 is connected to a speed regulator 21. The speed regulator 21 is used to adjust the rotation speed of the drive motor 2 to simulate the rotation speed of the drilling rig driving the rotating rod. The drill chuck 3 is connected to the output shaft of the drive motor 2 through a coupling. The simulated wellbore 4 is horizontally installed on the test platform 1 at the rear side of the drill chuck 3 through a retaining frame 10. The simulated wellbore 4 is coaxially arranged with the drill chuck 3. The drill string 5 is rotatably mounted in the simulated wellbore 4 through a stabilizer 9. One end of the drill string 5 is connected to the drill chuck 3. The drill chuck 3 can realize the rapid disassembly of the drill string 5 to facilitate the replacement of drill strings 5 ​​of other sizes, thereby obtaining a larger test range. The other end of the drill string 5 is connected to the drill chuck 3 installed on the detection system 8. The axial force applying device 6 at the end of the test platform 1 is connected, and the axial force applying device 6 is used to simulate the axial force applied by the rock formation to the drill string 5. A plurality of sensors 7 for real-time detection of the vibration characteristics of the drill string 5 are installed on the simulated wellbore 4. The sensor 7 includes a base 71, a magnetic sheet 72, a detection component 73, a transmission line 74 and a retaining ring 75. The base 71 is sleeved on the outer end of the simulated wellbore 4, and the two ends of the base 71 are fixed to the simulated wellbore 4 through the retaining ring 75. The detection component 73 is connected to the base 71 through the magnetic sheet 72. The detection component 73 transmits the detected data to the detection system 8 by using the transmission line 74. The detection system 8 includes a data acquisition device 81, a data line 82 and a computer 83. The data acquisition device 81 receives the data collected by the plurality of sensors 7, and transmits the data to the computer 83 through the data line 82. The frequency spectrum is generated by using the software installed in the computer 83, and then the vibration force of the drill string 5 is intuitively displayed, so as to facilitate the study of the friction experiment between the drill string 5 and the cuttings river.

[0028] In order to improve the accuracy of the experiment, Figure 4 , Figure 5As shown, the stabilizer 9 includes a sealing end cover 91, a fixed convex frame 92, a fixed concave frame 93 and a bearing 94. The sealing end covers 91 of the two stabilizers 9 are fixedly installed at both ends of the simulated wellbore 4. The sealing end covers 91 can close the simulated wellbore 4 to simulate the closed environment of drilling. The fixed convex frame 92 is installed on the drill string 5. The bearing 94 is sleeved on the fixed convex frame 92. The fixed concave frame 93 is installed on the outside of the bearing 94, and the fixed concave frame 93 is connected to the retainer 10. The retainer 10 includes a lower bracket 101, a gasket 102, an upper cover 103 and a bolt 104. The upper cover 103 is connected to the top of the lower bracket 101 through the gasket 102. A limiting portion adapted to the contour of the simulated wellbore 4 or the stabilizer 9 is processed between the upper cover 103 and the lower bracket 101. The upper cover 103 is fixedly connected to the lower bracket 101 through bolts 104. The bottom of the lower bracket 101 is connected to the test bench 1 through bolts. The retainer 10 is used to fix the simulated wellbore 4.

[0029] like Figure 6 As shown, the axial force applying device 6 includes a rock formation simulation frame 61, a plane push rod 62 and a thrust spring 63. The two rock formation simulation frames 61 are fixed on the detection platform 1. The plane push rod 62 vertically passes through the two rock formation simulation frames 61 and can slide back and forth between the two rock formation simulation frames 61. One end of the plane push rod 62 is in contact with the drill string 5. The thrust spring 63 is mounted on the plane push rod 62 near one end of the drill string 5. During the rotation of the drill string 5, the plane push rod 62 applies axial force to the drill string 5 under the action of the thrust spring 63.

[0030] The method of using the present invention is:

[0031] When in use, the drill chuck 3 is used to clamp the drill string 5, and then the speed is adjusted by the speed regulator 21. The speed regulator 21 also serves as a starting switch for the drive motor 2. After the drive motor 2 is started, the drive motor 2 drives the drill string 5 to rotate in the simulated wellbore 4 through the coupling and the drill chuck 3, and the rear end of the drill string 5 is subjected to axial force under the action of the thrust spring 63. During this process, the data acquisition device 81 collects the vibration characteristics of the multiple sensors 7 and transmits them to the computer 83 through the data line 82 for analysis and spectrum generation.

[0032] The entire simulation system adopts a modular design and can be quickly adjusted according to specific parameters, so that real-time data of the vibration simulation characteristics of the drill string 5 can be quickly obtained to provide guiding data for oil and gas exploration.

[0033] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention shall be included in the protection scope of the present invention. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitation of the present invention.

Claims

1. A drill string vibration simulation test system, characterized in that: The invention comprises a test platform (1), a drive motor (2), a drill chuck (3), a simulated wellbore (4), a drill string (5), an axial force applying device (6) and a test system (8); the test platform (1) is rectangular; a drive motor (2) is installed at one end of the test platform (1); a speed regulator (21) is connected to the drive motor (2); the drill chuck (3) is connected to the output shaft of the drive motor (2) via a coupling; the simulated wellbore (4) is horizontally installed behind the drill chuck (3) via a retaining frame (10). On a test bench (1) on the side, a simulated wellbore (4) and a drill chuck (3) are coaxially arranged, the drill string (5) is rotatably mounted in the simulated wellbore (4) via a stabilizer (9), one end of the drill string (5) is connected to the drill chuck (3), and the other end of the drill string (5) is connected to an axial force applying device (6) installed at the end of the test bench (1), and a plurality of sensors (7) for real-time detection of vibration characteristics of the drill string (5) are installed on the simulated wellbore (4), and the plurality of sensors (7) are connected to a detection system (8).

2. The drill string (5) vibration simulation test system according to claim 1, characterized in that: The stabilizer (9) comprises a sealing end cover (91), a fixed convex frame (92), a fixed concave frame (93) and a bearing (94); the sealing end covers (91) of the two stabilizers (9) are fixedly mounted at both ends of the simulated wellbore (4); the fixed convex frame (92) is mounted on the drill string (5); the bearing (94) is sleeved on the fixed convex frame (92); the fixed concave frame (93) is mounted on the outside of the bearing (94); and the fixed concave frame (93) is connected to the retaining frame (10).

3. The drill string (5) vibration simulation test system according to claim 1 or 2, characterized in that: The retaining frame (10) comprises a lower support (101), a gasket (102), an upper cover (103) and bolts (104); the upper cover (103) is connected to the top of the lower support (101) via the gasket (102); a limiting portion adapted to the contour of a simulated wellbore (4) or a stabilizer (9) is processed between the upper cover (103) and the lower support (101); the upper cover (103) and the lower support (101) are fixedly connected via bolts (104); and the bottom of the lower support (101) is connected to the detection platform (1) via bolts.

4. The drill string (5) vibration simulation test system according to claim 1, characterized in that: The axial force applying device (6) comprises a rock formation simulation frame (61), a planar push rod (62) and a thrust spring (63). The two rock formation simulation frames (61) are fixed on the detection platform (1). The planar push rod (62) vertically passes through the two rock formation simulation frames (61) and can slide back and forth between the two rock formation simulation frames (61). One end of the planar push rod (62) is in contact with the drill string (5). The thrust spring (63) is mounted on the planar push rod (62) near one end of the drill string (5).

5. The drill string (5) vibration simulation test system according to claim 1, characterized in that: The sensor (7) comprises a base (71), a magnetic sheet (72), a detection component (73), a transmission line (74) and a retaining ring (75); the base (71) is sleeved on the outer end of the simulated wellbore (4); both ends of the base (71) are fixed to the simulated wellbore (4) via the retaining ring (75); the detection component (73) is connected to the base (71) via the magnetic sheet (72); and the detection component (73) transmits the detected data to the detection system (8) via the transmission line (74).

6. The drill string (5) vibration simulation test system according to claim 5, characterized in that: The detection system (8) comprises a data collector (81), a data line (82) and a computer (83). The data collector (81) receives data collected by a plurality of sensors (7) and transmits the data to the computer (83) via the data line (82). The frequency spectrum is generated using software installed in the computer (83).

Images