A coiled tube high-cycle-low-cycle composite fatigue life test platform

Abstract

The present invention relates to a test platform, and in particular to a continuous tube high-cycle-low-cycle composite fatigue life test platform. The test platform is composed of a lateral vibration device A, a lateral vibration device B and an axial vibration device. An injection head is installed on one side of the lateral vibration device A, and a lateral vibration device B is arranged on the lower side of the injection head; a gooseneck is arranged above the injection head, and an axial vibration device is arranged below the injection head; a roller is arranged on the other side of the lateral vibration device A, and a hydraulic pump station is arranged on the side of the roller. The test platform can vibrate the continuous tube through the vibration device, thereby introducing high-cycle fatigue caused by vibration during the test process, and at the same time, it can make the force of the continuous tube more consistent with the actual working conditions, and make the fatigue parameters more accurate, so as to solve the problem that the existing fatigue testing machine can only perform low-cycle fatigue tests, which is inconsistent with the load of the continuous tube under the actual working conditions, resulting in inaccurate test results, and provide a fatigue test equipment that meets the actual working conditions.

Description

Technical Field

[0001] The invention relates to a test platform, in particular to a continuous tube high-cycle-low-cycle composite fatigue life test platform. Background Art

[0002] Coiled tubing, also known as flexible tubing, coiled tubing or flexible tubing, is welded from steel strips. It is a threadless joint-free pipe. The length of a single coiled tubing can reach several thousand meters or even tens of thousands of meters. It has the characteristics of high strength and high toughness. Compared with conventional operation technology, coiled tubing operation has unique advantages such as high efficiency, less formation damage, small footprint, and reusability. It has been widely used worldwide and has become one of the more cutting-edge high-end technologies in today's oil and gas industry. With the advancement of oil and gas field development technology and the expansion of the scope of operations, the operating environment of coiled tubing has become increasingly harsh. Every time an underground operation is carried out, the coiled tubing will undergo multiple large plastic deformations of bending and straightening, which greatly reduces its service life, making fatigue life one of the key factors restricting the development of coiled tubing technology.

[0003] In order to predict the fatigue life of coiled tubing, the commonly used method is fatigue test method. The existing coiled tubing low-cycle fatigue tester can simulate the bending-straightening fatigue process of coiled tubing, but it also has some shortcomings. The existing fatigue tester can only conduct low-cycle fatigue test on coiled tubing under internal pressure and bending, which is quite different from the load that coiled tubing bears during actual operation. In actual operation, coiled tubing will not only be subjected to low-cycle fatigue caused by the coupling of internal pressure, tension, bending, extrusion and multiple loads, but also suffer from high-cycle fatigue damage caused by vibration. For example, when the coiled tubing passes through the roller and gooseneck guide, the coiled tubing will produce plastic deformation of repeated bending and straightening; the coiled tubing between the roller and the gooseneck will be subjected to high-cycle fatigue damage under the action of internal pressure and the vibration caused by the downhole tool (the vibration includes axial vibration and lateral vibration); and high-cycle vibration. Therefore, the actual fatigue life of the coiled tube should belong to the high-cycle-low-cycle combined fatigue problem. It is urgent to design a coiled tube high-cycle-low-cycle combined fatigue life test platform to conduct accurate tests and obtain the dynamic fatigue parameters, static fatigue parameters and buckling parameters of the coiled tube. Summary of the invention

[0004] The purpose of the present invention is to provide a high-cycle-low-cycle composite fatigue life test platform for coiled tubing that can meet actual working conditions and perform high-cycle-low-cycle composite fatigue life tests on coiled tubing, so as to make up for the fact that existing fatigue testing machines can only perform low-cycle fatigue tests, and avoid the problem that the test results are inconsistent with the loads borne by the coiled tubing under actual working conditions, resulting in inaccurate test results.

[0005] The technical solution of the present invention is:

[0006] A coiled tube high-cycle-low-cycle composite fatigue life test platform, which consists of a lateral vibration device A, an injection head, a lateral vibration device B, a gooseneck, an axial vibration device, a roller and a hydraulic pump station, and is characterized in that: an injection head is installed on one side of the lateral vibration device A through an injection head bracket, and a lateral vibration device B is arranged below the injection head; a gooseneck is installed on the injection head bracket above the injection head through fixing bolts, an axial vibration device is arranged below the injection head, and a hanging weight is arranged at the end of the coiled tube below the axial vibration device; a roller is arranged on the other side of the lateral vibration device A, and a hydraulic pump station is arranged beside the roller, and the hydraulic pump station is connected to the roller and the axial vibration device through connecting pipes respectively.

[0007] The lateral vibration device A and the lateral vibration device B are respectively composed of a support, a support platform, a vibration motor, a turntable, a guide rail, a push rod and a pipe clamp. The support is installed with a support platform through evenly distributed buffer springs, the support is provided with a vibration motor, the output shaft of the vibration motor is installed with a turntable through a reducer, a push rod is installed on the support at the front end of the turntable through a guide rail, and the push rod is movably connected to the turntable through a pin shaft; a pipe clamp is provided at the end of the push rod.

[0008] The guide rail of the lateral vibration device A is C-shaped, and the push rod is movably plug-in connected to the two end ends of the guide rail of the lateral vibration device A; the guide rail of the lateral vibration device B is a rod-shaped body arranged in parallel, and the push rod is movably plug-in connected to the rod-shaped body of the lateral vibration device B; the push rods between the two end ends of the guide rail of the lateral vibration device A and between the rod-shaped bodies of the lateral vibration device B are respectively provided with slide grooves, and the slide grooves are movably connected to the pin shaft.

[0009] The rotating disk is provided with a plurality of adjustment holes in a radial direction, and the adjustment holes are fixedly connected with the pin shafts.

[0010] The pipe clamp is composed of parallel connection plates, connecting rods and arc rollers. The connection plates are fixedly connected by connecting rods, and arc rollers are movably installed on the inner sides of the connection plates through pins. The connection plates are hinged with the push rods.

[0011] A caliper is also arranged between the push rod and the connecting plate. One end of the caliper is hinged to the connecting plate, and the other end of the caliper is evenly distributed with positioning holes. The caliper is fixedly connected to the push rod through fixing bolts and the positioning holes.

[0012] The axial vibration device is composed of a symmetrically arranged shell, end cover and piston. The shells are fixedly connected by external flanges and fixing bolts, and rubber pads are installed between the shells through assembly holes; a piston is installed on the outer shell through the end cover; an oil inlet and an oil outlet are arranged on the end cover, and the end cover is connected to the hydraulic pump station through the oil inlet and the oil outlet.

[0013] The shell is provided with a semicircular assembly groove, the assembly groove is provided with a flow groove, and the shell at the end of the assembly groove is provided with a sealing groove.

[0014] The cross section of the piston is semicircular, and the piston is respectively connected to the assembly groove and the end cover in a sliding and sealing manner; a connecting hole A is provided on the circumferential surface of the piston, and the connecting hole A is intermittently connected to the oil inlet through the sealing groove; a connecting hole B is provided on the circumference of the piston on one side of the connecting hole A, and the connecting hole B is intermittently connected to the oil outlet through the flow groove; a piston flange is provided on the end of the piston circumferential surface on the other side of the connecting hole A, and the piston flange is connected to the sealing groove in a sliding and sealing manner; a countersunk hole is provided on the piston end surface on one side of the piston flange, and the countersunk hole is respectively connected to the connecting hole A and the connecting hole B.

[0015] Furthermore, a support plate is provided on the injection head bracket below the injection head, a straight mold is provided on the support plate on one side of the injection head outlet, and a curved mold is provided on the support plate on the other side of the injection head outlet.

[0016] Furthermore, a simulated wellbore is arranged below the axial vibration device.

[0017] The beneficial effects of the present invention are:

[0018] Compared with the existing continuous low cycle fatigue testing machine, the coiled tube high cycle-low cycle composite fatigue life test platform has the following advantages:

[0019] (1) High cycle fatigue can be introduced into the fatigue life test of the coiled tubing through the axial vibration device, and the amplitude and frequency of the vibration device can be freely adjusted, so as to change the magnitude of the exciting force input to the coiled tubing; when the coiled tubing is pulled by the hanging weight, the force on the gooseneck tube is more in line with reality, so that more accurate strain value and fatigue life can be measured (dynamic fatigue test);

[0020] (2) A straight die and a bending die can be installed at the lower part of the injection head, and the coiled tubing can be driven by the lateral vibration device B to perform a bending and straight fatigue test (static fatigue test);

[0021] (3) In addition to conducting fatigue performance tests on coiled tubing, the test platform can also lower the coiled tubing into a simulated wellbore to conduct downhole buckling behavior research;

[0022] The invention solves the problem that the existing fatigue testing machine can only perform low-cycle fatigue test, which is inconsistent with the load on the coiled tube under actual working conditions, resulting in inaccurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 is a front cross-sectional view of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the lateral vibration device A of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the lateral vibration device B of the present invention;

[0027] Figure 5 It is a schematic diagram of the assembly of the guide rail of the lateral vibration device A of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the turntable of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the pipe clamp of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the axial vibration device of the present invention;

[0031] Fig. 9 yes Figure 8 Schematic diagram of the cross section along the AA direction;

[0032] Fig.10 yes Figure 8 Schematic diagram of the cross section along the BB direction;

[0033] Fig.11 It is a structural schematic diagram of the housing of the present invention;

[0034] Fig.12 It is a structural schematic diagram of the piston of the present invention;

[0035] Fig.13 yes Fig.12 Schematic diagram of the cross section along the CC direction;

[0036] Fig.14 It is a structural schematic diagram of the drum of the present invention;

[0037] Fig.15 is a cross-sectional schematic diagram of the drum of the present invention;

[0038] Fig.16 It is a structural schematic diagram of the static test of the present invention;

[0039] Fig.17 It is a schematic diagram of the assembly of the straight mold and the curved mold of the present invention;

[0040] Fig.18 It is a structural schematic diagram of the buckling behavior research of the present invention.

[0041] In the figure: 1, lateral vibration device A, 2, injection head, 3, lateral vibration device B, 4, gooseneck, 5, axial vibration device, 6, roller, 7, hydraulic pump station, 8, injection head bracket, 9, hanging weight block, 10, support plate, 11, straight mold, 12, bending mold, 13, simulated wellbore, 14, control cabinet, 15, continuous pipe, 101, support, 102, support table, 103, vibration motor, 104, turntable, 105, guide rail, 106, push rod, 107, buffer spring, 108, reducer, 109, pin shaft, 110, slide groove, 111, adjustment hole, 1 12. connecting plate, 113. connecting rod, 114. arc roller, 115. caliper, 116. positioning hole, 501. housing, 502. end cover, 503. piston, 504. rubber pad, 505. oil inlet, 506. oil outlet, 507. assembly groove, 508. flow groove, 509. sealing groove, 510. connecting hole A, 511. connecting hole B, 512. piston flange, 513. countersunk hole, 601. winding groove, 602. fixer, 603. rotating shaft, 604. drum motor, 605. hydraulic cylinder, 606. flexible joint, 607. connector. DETAILED DESCRIPTION

[0042] Example 1

[0043] The coiled tubing high-cycle-low-cycle composite fatigue life test platform is composed of a lateral vibration device A1, an injection head 2, a lateral vibration device B3, a gooseneck tube 4, an axial vibration device 5, a roller 6 and a hydraulic pump station 7. An injection head 2 is installed on one side of the lateral vibration device A1 through an injection head bracket 8, so that the injection head 2 drives the coiled tubing to move downward, thereby simulating the process of the injection head injecting the coiled tubing into the well; a lateral vibration device B3 is arranged on the lower side of the injection head 2, and the functions of the lateral vibration device A1 and the lateral vibration device B3 are to respectively drive the coiled tubing to vibrate laterally through the lateral vibration device A1 and the lateral vibration device B3.

[0044] The lateral vibration device A1 and the lateral vibration device B3 are respectively composed of a support 101, a support platform 102, a vibration motor 103, a turntable 104, a guide rail 105, a push rod 106 and a pipe clamp. The support platform 102 is installed on the support 101 through a buffer spring 107 evenly arranged. The function of the buffer spring 107 is to buffer the support platform 102, thereby reducing the vibration caused by the vibration motor 103; the vibration motor 103 is arranged on the support platform 102, and the turntable 104 is installed on the output shaft of the vibration motor 103 through a reducer 108. The push rod 106 is installed on the support 101 at the front end of the turntable 104 through the guide rail 105. The push rod 106 is connected to the turntable 104 through a pin 109. The function of the vibration motor 103 is to drive the turntable 104 to rotate through the reducer 108 during the rotation of the vibration motor 103, and the turntable 104 drives the push rod 106 to move through the pin 109 during the rotation of the turntable 104; the push rod 106 is in a cross shape, and the guide rail 105 of the lateral vibration device A1 is in a C shape. The push rod 106 and the two end heads of the guide rail 105 of the lateral vibration device A1 are respectively movably plug-in connected; the guide rail 105 of the lateral vibration device B3 is a rod-shaped body arranged in parallel, and the push rod 106 is respectively movably plug-in connected with the rod-shaped body of the lateral vibration device B3; the function of the guide rail 105 is to support the push rod 106 on the one hand, and on the other hand, The ends of the rod 106 are movably connected with the guide rail 105, and the guide rail 105 can limit the push rod 106 so that the push rod 106 can only move in a predetermined direction without deviation; a slide groove 110 is respectively arranged on the push rod 106 between the ends of the guide rail 105 of the lateral vibration device A1 and between the rod-shaped bodies of the lateral vibration device B3, and the slide groove 110 is movably connected with the pin shaft 109. The function of the slide groove 110 is to enable the pin shaft 109 to slide with the slide groove 110 during the movement of the push rod 106 driven by the turntable 104 through the pin shaft 109, so as to convert the circular motion of the turntable 104 into the linear motion of the push rod 106; a plurality of adjustment holes are arranged radially on the turntable 104. 111, the adjustment hole 111 is fixedly connected to the pin 109. The function of the adjustment hole 111 is to adjust the position of the pin 109 through the adjustment holes 111 at different positions, thereby adjusting the rotation radius of the pin 109, thereby adjusting the movement amplitude of the push rod 106 when the pin 109 drives the push rod 106 to move, that is, adjusting the amplitude of the push rod 106; by adjusting the speed of the vibration motor 103, the speed of the turntable 104 can be adjusted, thereby adjusting the movement speed of the push rod 106, thereby adjusting the vibration frequency of the push rod 106; by adjusting the amplitude and frequency of the push rod 106, the amplitude and frequency of the lateral vibration of the coiled tube when the push rod 106 drives the coiled tube to move are consistent with the actual working conditions, thereby ensuring the accuracy of the detection result;The end of the push rod 106 is provided with a pipe clamp, so that the push rod 106 can be connected to the continuous pipe 15 through the pipe clamp, so that the push rod 106 drives the continuous pipe to vibrate and bend laterally through the pipe clamp during the movement, thereby testing the fatigue life of the continuous pipe during the vibration and bending process of the continuous pipe; the pipe clamp is composed of a connecting plate 112, a connecting rod 113 and an arc roller 114 arranged in parallel, the connecting plates 112 are fixedly connected by the connecting rod 113, and the inner sides of the connecting plates 112 are movably installed with arc rollers 114 through pins, and the function of the arc rollers 114 is to reduce the friction between the pipe clamp and the continuous pipe through the rolling friction between the arc rollers 114 and the continuous pipe, thereby reducing the wear of the pipe clamp on the continuous pipe, thereby reducing the influence of the pipe clamp on the continuous pipe in terms of wear, and improving the test efficiency. The accuracy of the test results is ensured; the connecting plate 112 is hinged with the push rod 106; a caliper 115 is also arranged between the push rod 106 and the connecting plate 112, one end of the caliper 115 is hinged with the connecting plate 112, and the other end of the caliper 115 is evenly distributed with positioning holes 116, and the caliper 115 is fixedly connected with the push rod 106 through the fixing bolts and the positioning holes 116; the function of the caliper 115 is to adjust the angle between the pipe clamp and the push rod 106 through the positioning holes 116 on the caliper 115, so that the pipe clamp can keep parallel with the movement direction of the continuous pipe, so that the pipe clamp only generates thrust on the continuous pipe when driving the continuous pipe to move, and does not generate other forces on the continuous pipe, so that the continuous pipe is only subjected to bending stress when the pipe clamp drives the continuous pipe to move, further ensuring the accuracy of the test results.;

[0045] A gooseneck 4 is mounted on the injection head bracket 8 above the injection head 2 by fixing bolts. The gooseneck 4 can be replaced to study the fatigue life of the continuous pipe under different bending radii.

[0046] An axial vibration device 5 is provided below the injection head 2 to make the coiled tubing axially vibrate through the axial vibration device 5, so as to test the high cycle fatigue life of the coiled tubing through the axial vibration device 5; the axial vibration device 5 is composed of a symmetrically arranged shell 501, an end cover 502 and a piston 503, the shells 501 are fixedly connected by an outer flange and fixing bolts, a semicircular assembly groove 507 is provided on the shell 501, a flow groove 508 is provided on the assembly groove 507, and a sealing groove 509 is provided on the shell 501 at the end of the assembly groove 507; the shells 501 are fixedly connected by an outer flange and fixing bolts, and a semicircular assembly groove 507 is provided on the shell 501. The flow groove 508 is provided on the assembly groove 507. The shell 501 is provided with a sealing groove 509 at the end of the assembly groove 507. The hole is installed with a rubber pad 504, which is connected to the continuous pipe through the rubber pad 504 to increase the friction between the rubber pad 504 and the continuous pipe, so that the axial vibration device 5 drives the continuous pipe to vibrate, and the rubber pad 504 ensures the transmission of force between the axial vibration device 5 and the continuous pipe; a piston 503 is installed on the outer side of the shell 501 through the end cover 502; an oil inlet 505 and an oil outlet 506 are arranged on the end cover 502, and the end cover 502 is connected to the hydraulic pump station 7 through the oil inlet 505 and the oil outlet 506; the cross section of the piston 503 is semicircular, and the piston 503 is respectively connected to the assembly The groove 507 is slidably sealed and connected with the end cover 502; a connecting hole A510 is provided on the circumferential surface of the piston 503, and the connecting hole A510 is intermittently connected with the oil inlet 505 through the sealing groove 509; a connecting hole B511 is provided on the circumference of the piston 503 on one side of the connecting hole A510, and the connecting hole B511 is intermittently connected with the oil outlet 506 through the flow groove 508; a piston flange 512 is provided on the end of the circumferential surface of the piston 503 on the other side of the connecting hole A510, and the piston flange 512 is slidably sealed and connected with the sealing groove 509; a piston 503 end surface on one side of the piston flange 512 is provided There is a countersunk hole 513, which is connected to the communication hole A510 and the communication hole B511 respectively; the position of the piston 503 in the housing 501 has two states: 1. The communication hole A510 on the piston 503 is connected to the sealing groove 509 and the countersunk hole 513 respectively, and the communication hole B511 on the piston 503 is connected to the countersunk hole 513 and sealed with the assembly groove 507; 2. The communication hole A510 on the piston 503 is connected to the countersunk hole 513 and sealed with the assembly groove 507 respectively, and the communication hole B511 on the piston 503 is connected to the circulation groove 508 and the countersunk hole 513;When the position of the piston 503 is in state 1, the high-pressure liquid enters the sealing groove 509 between the assembly groove 507 and the piston flange 512 from the oil inlet 505 on the end cover 502, and the high-pressure liquid entering the sealing groove 509 enters the counterbore 513 from the connecting hole A510, and then enters the sealing groove 509 on the end face of the piston 503 from the counterbore 513, so that the piston 503 is pushed to move toward the circulation groove 508 under the action of the pressure and the inertia of the piston 503, so that the connecting hole A510 of the piston 503 is gradually sealed with the assembly groove 507 and the connecting hole B511 is gradually connected with the circulation groove 508, and the piston 503 is pressed against the piston 503. This causes the position of the piston 503 to change from state 1 to state 2. After the position of the piston 503 changes from state 1 to state 2, the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 flows out through the connecting hole B511, the flow groove 508, and the oil outlet 506 on the end cover 502 under the action of pressure, so that the pressure of the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 is restored to a low-pressure state; when the position of the piston 503 is in state 2, the high-pressure liquid enters the sealing groove 509 between the assembly groove 507 and the piston flange 512 from the oil inlet 505 on the end cover 502, so that the seal between the assembly groove 507 and the piston flange 512 is The pressure of the high-pressure liquid in the groove 509 gradually increases. Since the pressure of the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 is in a low-pressure state, the pressure of the high-pressure liquid in the sealing groove 509 between the assembly groove 507 and the piston flange 512 gradually increases. Under the action of the high-pressure liquid pressure, the piston flange 512 is pushed away from the flow groove 508, thereby driving the piston 503 to move. During the movement of the piston 503, under the action of the high-pressure liquid pressure and the inertia of movement, the connecting hole A510 of the piston 503 is gradually connected with the sealing groove 509 and the connecting hole B511 is gradually sealed with the assembly groove 507, so that the position of the piston 503 changes from state 2 to state 3. Transform to state 1, and repeat this cycle. When the piston 503 is transformed between state 1 and state 2 under the action of high-pressure liquid, the high-pressure liquid pushes the piston 503 to perform axial reciprocating motion, thereby causing the piston 503 to vibrate axially, thereby prompting the housing 501 to vibrate axially, so that the housing 501 can drive the continuous tube to vibrate axially through the rubber pad 504; by adjusting the pressure and flow rate of the high-pressure liquid input into the axial vibration device 5 by the hydraulic pump station 7, the speed and amplitude of the movement of the piston 503 can be adjusted, and then the axial amplitude and frequency of the axial vibration device 5 can be adjusted, and then the axial vibration device 5 can drive the continuous tube to vibrate through adjustment, thereby ensuring the accuracy of the detection result. ;

[0047] A hanging weight block 9 is arranged below the axial vibration device 5. After the coiled tubing is lowered into the well, a long section of the coiled tubing will be in the well. The gravity of the coiled tubing in the well will form a pulling force on the coiled tubing on the well. The longer the length of the coiled tubing in the well, the greater the pulling force of the coiled tubing in the well on the well. The function of the hanging weight block 9 is to simulate the weight of the coiled tubing in the well to form a pulling force on the coiled tubing through the weight of the hanging weight block 9, so as to simulate the pulling force of the coiled tubing in the well on the coiled tubing, thereby making the force of the coiled tubing in the fatigue test more in line with the actual situation; a roller 6 is arranged on the other side of the lateral vibration device A1, and a plurality of winding grooves 601 are arranged on the roller 6, so that the coiled tubings of different specifications can be wound through the plurality of winding grooves 601, so as to facilitate the fatigue test of the coiled tubing of different specifications. The winding groove 601 is provided with a fixture 602 for fixing the end of the coiled tube. During the rotation of the drum 6, the coiled tube that does not need to be tested is prevented from falling through the fixture 602. The rotating shaft 603 of the drum 6 is connected with a drum motor 604, so that the drum 6 is driven to rotate by the drum motor 604, so that the coiled tube is unwound or reeled in during the rotation of the drum 6. The base of the drum 6 is provided with a hydraulic cylinder 605 for driving the drum 6 to move axially, so that when the hydraulic cylinder 605 drives the drum 6 to move axially and the drum 6 is unwound or reeled in, the coiled tube can be evenly wound on the drum 6 when it is reeled, or the coiled tube can be unwound on the drum 6 when it is unwound. The reel is unwound at a uniform speed; the rotating shaft 603 of the drum 6 is a hollow cylinder with one end closed, and the other end of the rotating shaft 603 of the drum 6 is provided with a flexible joint 606. The rotating shaft 603 inside the drum 6 is provided with a connector 607 for connecting the continuous pipe. The continuous pipe is connected to the flexible joint 606 through the connector 607 and the rotating shaft 603 in sequence, and then high-pressure liquid is injected into the continuous pipe through the flexible joint 606, the rotating shaft 603, and the connector 607 in sequence to form an internal pressure in the continuous pipe to simulate the internal pressure of the drilling fluid on the continuous pipe under actual working conditions; a hydraulic pump station 7 is provided on the side of the drum 6, and the hydraulic pump station 7 is connected to the drum 6 and the axial vibration device 5 through a connecting pipe, specifically: the hydraulic pump station 7 is connected to the axial vibration device through a connecting pipe The oil inlet 505 and the oil outlet 506 of the roller 5 are connected, so that the hydraulic pump station 7 supplies liquid to the axial vibration device 5 through the oil inlet 505 and returns oil through the oil outlet 506; the hydraulic pump station 7 is connected with the hydraulic cylinder 605 and the flexible joint 606 of the roller 6 through the connecting pipe, so that the hydraulic pump station 7 drives the hydraulic cylinder 605 to move, and can sequentially inject high-pressure liquid into the continuous tube through the connecting pipe, the flexible joint 606, the rotating shaft 603, and the connecting head 607, so that internal pressure is formed in the continuous tube; the function of the flexible joint 606 is to prevent the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from rotating through the flexible joint 606 during the rotation of the rotating shaft 603, thereby preventing the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from being broken.

[0048] The coiled tubing high-cycle-low-cycle composite fatigue life test platform also includes a control cabinet 14, a control unit of which is electrically connected to the drum motor 604, the hydraulic pump station 7, the injection head 2, the lateral vibration device A1, and the vibration motor 103 of the lateral vibration device B3, respectively, so as to control the pressure and flow rate of the high-pressure liquid input into the coiled tubing and the axial vibration device 5 by the hydraulic pump station 7 through the control cabinet 14, thereby controlling the internal pressure of the coiled tubing and the vibration frequency and amplitude of the axial vibration device; and controlling the rotation speed of the vibration motor 103 of the lateral vibration device A1 and the lateral vibration device B3 through the control cabinet 14, thereby controlling the vibration frequency of the lateral vibration device A1 and the lateral vibration device B3, thereby ensuring the accuracy of the test results.

[0049] When the coiled tube high-cycle-low-cycle composite fatigue life test platform performs a dynamic test to determine the dynamic fatigue parameters of the coiled tube, the specifications of the gooseneck tube 4 are selected as required, and the selected gooseneck tube 4 is installed on the injection head bracket 8 above the injection head 2; the weight of the hanging weight 9 is selected as required, and after the coiled tube port below the injection head 2 is closed, the hanging weight 9 is hung on the end of the coiled tube to be tested; the rotation speeds of the lateral vibration device A1 and the lateral vibration device B3, the output pressure of the hydraulic pump station 7 to the coiled tube, and the output pressure and flow rate to the axial vibration device 5 are set on the control cabinet 14 as required; the adjustment hole 111 for the pin shaft 109 to be inserted is selected as required, Insert the pin 109 into the selected adjustment hole 111; after the adjustment is completed, start the vibration motors 103 of the lateral vibration device A1 and the lateral vibration device B3 respectively through the control cabinet 14, start the hydraulic pump station 7 to supply oil to the coiled tube and the axial vibration device 5 respectively, and start the roller motor 604; after the hydraulic pump station 7 is started, firstly, inject high-pressure liquid into the coiled tube so that the pressure of the high-pressure liquid in the coiled tube reaches the test requirement; secondly, after the high-pressure liquid is injected into the coiled tube, the hydraulic pump station 7 supplies liquid to the axial vibration device 5 so that the axial vibration device 5 drives the coiled tube to vibrate; after the vibration motor 103 of the lateral vibration device A1 is started, the lateral vibration device A1 The vibration motor 103 of the transverse vibration device B3 drives the pipe clamp to vibrate through the reducer 108, the turntable 104, the pin 109, and the push rod 106 in sequence, thereby driving the continuous pipe between the gooseneck pipe 4 and the roller 6 to vibrate horizontally; after the vibration motor 103 of the transverse vibration device B3 is started, the vibration motor 103 of the transverse vibration device B3 drives the pipe clamp to vibrate through the reducer 108, the turntable 104, the pin 109, and the push rod 106 in sequence, thereby driving the continuous pipe under the injection head 2 to vibrate horizontally through the pipe clamp; after the roller motor 604 is started, the roller motor 604 drives the roller 6 to rotate through the rotating shaft 603, so that the roller 6 unwinds the continuous pipe, and the unwinding After a certain length (the length is determined by the height between the injection head 2 and the ground, and the hanging weight 9 at the end of the coiled tube does not fall to the ground during unwinding), the drum motor 604 rotates in the opposite direction, thereby driving the drum 6 to reverse, so that the drum 6 rewinds the coiled tube (the rewinding length is equal to the unwinding length), so that the coiled tube performs an unwinding and rewinding cycle during the test to simulate the unwinding and rewinding process of the coiled tube; the high cycle fatigue of the coiled tube under actual working conditions is simulated by the lateral vibration device and axial vibration of the coiled tube, thereby simulating the fatigue effect of the coiled tube under actual working conditions on the test platform, and after the coiled tube is continuously tested on the test platform, the fatigue parameters of the coiled tube are detected.

[0050] The test platform can make the coiled tube vibrate axially through the axial vibration device 5, thereby introducing high-cycle fatigue during the test process. At the same time, the suspended weight block 9 can make the force on the coiled tube more consistent with the actual working condition, making the fatigue parameters more accurate, thereby solving the problem that the existing fatigue testing machine can only perform low-cycle fatigue tests, which is inconsistent with the load on the coiled tube under the actual working condition, resulting in inaccurate test results.

[0051] Example 2

[0052] The coiled tubing high-cycle-low-cycle composite fatigue life test platform is composed of a lateral vibration device A1, an injection head 2, a lateral vibration device B3, a gooseneck tube 4, an axial vibration device 5, a roller 6 and a hydraulic pump station 7. An injection head 2 is installed on one side of the lateral vibration device A1 through an injection head bracket 8, so that the injection head 2 drives the coiled tubing to move downward, thereby simulating the process of the injection head injecting the coiled tubing into the well; a lateral vibration device B3 is arranged on the lower side of the injection head 2, and the functions of the lateral vibration device A1 and the lateral vibration device B3 are to respectively drive the coiled tubing to vibrate laterally through the lateral vibration device A1 and the lateral vibration device B3.

[0053] The lateral vibration device A1 and the lateral vibration device B3 are respectively composed of a support 101, a support platform 102, a vibration motor 103, a turntable 104, a guide rail 105, a push rod 106 and a pipe clamp. The support platform 102 is installed on the support 101 through a buffer spring 107 evenly arranged. The function of the buffer spring 107 is to buffer the support platform 102, thereby reducing the vibration caused by the vibration motor 103; the vibration motor 103 is arranged on the support platform 102, and the turntable 104 is installed on the output shaft of the vibration motor 103 through a reducer 108. The push rod 106 is installed on the support 101 at the front end of the turntable 104 through the guide rail 105. The push rod 106 is connected to the turntable 104 through a pin 109. 4 is movably connected. The function of the vibration motor 103 is to drive the turntable 104 to rotate through the reducer 108 during the rotation of the vibration motor 103. During the rotation of the turntable 104, the turntable 104 drives the push rod 106 to move through the pin 109; the guide rail 105 of the lateral vibration device A1 is C-shaped, and the push rod 106 is movably plug-in connected to the two end heads of the guide rail 105 of the lateral vibration device A1; the guide rail 105 of the lateral vibration device B3 is a rod-shaped body arranged in parallel, and the push rod 106 is movably plug-in connected to the rod-shaped body of the lateral vibration device B3; the function of the guide rail 105 is to support the push rod 106 on the one hand, and on the other hand, due to the push rod 106 The ends of both ends are movably connected with the guide rail 105, and the guide rail 105 can limit the push rod 106 so that the push rod 106 can only move along a predetermined direction without deviation; a slide groove 110 is respectively arranged on the push rod 106 between the ends of the guide rail 105 of the lateral vibration device A1 and between the rod-shaped bodies of the lateral vibration device B3, and the slide groove 110 is movably connected with the pin shaft 109. The function of the slide groove 110 is to enable the pin shaft 109 to slide with the slide groove 110 during the movement of the push rod 106 driven by the turntable 104 through the pin shaft 109, so as to convert the circular motion of the turntable 104 into the linear motion of the push rod 106; a plurality of adjustment holes 110 are arranged radially on the turntable 104. 1. The adjusting hole 111 is fixedly connected to the pin 109. The adjusting hole 111 is used to adjust the position of the pin 109 through the adjusting holes 111 at different positions, thereby adjusting the rotation radius of the pin 109, thereby adjusting the movement amplitude of the push rod 106 when the pin 109 drives the push rod 106 to move, that is, adjusting the amplitude of the push rod 106; by adjusting the speed of the vibration motor 103, the speed of the turntable 104 can be adjusted, thereby adjusting the movement speed of the push rod 106, thereby adjusting the vibration frequency of the push rod 106; by adjusting the amplitude and frequency of the push rod 106, the amplitude and frequency of the lateral vibration of the coiled tube when the push rod 106 drives the coiled tube to move are consistent with the actual working conditions, thereby ensuring the accuracy of the detection result;The end of the push rod 106 is provided with a pipe clamp, so that the push rod 106 can be connected to the continuous pipe through the pipe clamp, so that the push rod 106 drives the continuous pipe to vibrate and bend laterally through the pipe clamp during the movement, thereby testing the fatigue life of the continuous pipe during the vibration and bending process of the continuous pipe; the pipe clamp is composed of a connecting plate 112, a connecting rod 113 and an arc roller 114 arranged in parallel, the connecting plates 112 are fixedly connected by the connecting rod 113, and the inner sides of the connecting plates 112 are movably installed with arc rollers 114 through pins, and the function of the arc rollers 114 is to reduce the friction between the pipe clamp and the continuous pipe through the rolling friction between the arc rollers 114 and the continuous pipe, thereby reducing the wear of the pipe clamp on the continuous pipe, thereby reducing the influence of the pipe clamp on the continuous pipe in terms of wear, and improving the test The accuracy of the results; the connecting plate 112 is hinged with the push rod 106; a caliper 115 is also arranged between the push rod 106 and the connecting plate 112, one end of the caliper 115 is hinged with the connecting plate 112, and the other end of the caliper 115 is evenly distributed with positioning holes 116, and the caliper 115 is fixedly connected to the push rod 106 through the fixing bolts and the positioning holes 116; the function of the caliper 115 is to adjust the angle between the pipe clamp and the push rod 106 through the positioning holes 116 on the caliper 115, so that the pipe clamp can keep parallel with the movement direction of the continuous pipe, so that the pipe clamp only generates thrust on the continuous pipe when driving the continuous pipe to move, and does not generate other forces on the continuous pipe, so that the continuous pipe is only subjected to bending stress when the pipe clamp drives the continuous pipe to move, further ensuring the accuracy of the test results.;

[0054] A gooseneck 4 is mounted on the injection head bracket 8 above the injection head 2 by fixing bolts. The gooseneck 4 can be replaced to study the fatigue life of the continuous pipe under different bending radii.

[0055] An axial vibration device 5 is provided below the injection head 2, and a hanging weight block 9 is provided below the axial vibration device 5; a roller 6 is provided on the other side of the transverse vibration device A1, and a plurality of winding grooves 601 are provided on the roller 6, so that the continuous pipes of different specifications can be wound through the plurality of winding grooves 601, so as to facilitate fatigue testing of the continuous pipes of different specifications; a fixture 602 for fixing the end of the continuous pipe is provided on the winding groove 601, so that after the end of the continuous pipe is fixed by the fixture 602, the continuous pipe that does not need to be tested passes through the fixture 602 during the rotation of the roller 6 to prevent the continuous pipe from scattering; a roller motor 604 is connected to the rotating shaft 603 of the roller 6 , so that the roller 6 is driven to rotate by the roller motor 604, so that the continuous tube is unwound or reeled in the process of the roller 6 rotating; a hydraulic cylinder 605 for driving the roller 6 to move axially is provided on the base of the roller 6, so that when the hydraulic cylinder 605 drives the roller 6 to move axially and the roller 6 unwinds or reels the continuous tube, the continuous tube can be evenly wound on the roller 6 when it is reeled, or the continuous tube can be unwound at a uniform speed on the roller 6 when it is unwound; the rotating shaft 603 of the roller 6 is a hollow cylinder with one end closed, and the other end of the rotating shaft 603 of the roller 6 is provided with a movable joint 606, and the rotating shaft 603 inside the roller 6 3 is provided with a connector 607 for connecting the coiled tubing, and the coiled tubing is connected to the flexible joint 606 through the connector 607, the rotating shaft 603, and the connector 607 in sequence, and then the high-pressure liquid is injected into the coiled tubing through the flexible joint 606, the rotating shaft 603, and the connector 607 in sequence, so that the internal pressure is formed in the coiled tubing to simulate the internal pressure of the drilling fluid on the coiled tubing under actual working conditions; a hydraulic pump station 7 is provided on the side of the drum 6, and the hydraulic pump station 7 is connected to the drum 6 and the axial vibration device 5 through a connecting pipe, specifically: the hydraulic pump station 7 is connected to the oil inlet 505 and the oil outlet 506 of the axial vibration device 5 through the connecting pipe, so that the hydraulic pump station 7 is connected to the oil inlet 505 and the oil outlet 506 of the axial vibration device 5 through the connecting pipe, so that the hydraulic pump station 7 is connected to the oil inlet 505 and the oil outlet 506 of the axial vibration device 5 through the connecting pipe. 505 supplies oil to the axial vibration device 5, and returns oil through the oil outlet 506; the hydraulic pump station 7 is connected with the hydraulic cylinder 605 and the flexible joint 606 of the drum 6 through the connecting pipe, so that the hydraulic pump station 7 drives the hydraulic cylinder 605 to move, and can sequentially inject high-pressure liquid into the continuous tube through the connecting pipe, the flexible joint 606, the rotating shaft 603, and the connecting head 607, so that internal pressure is formed in the continuous tube; the function of the flexible joint 606 is to prevent the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from rotating through the flexible joint 606 during the rotation of the rotating shaft 603, thereby preventing the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from being twisted off.

[0056] The coiled tubing high-cycle-low-cycle composite fatigue life test platform also includes a control cabinet 14, a control unit of which is electrically connected to the drum motor 604, the hydraulic pump station 7, the injection head 2, and the vibration motors 103 of the lateral vibration device A1 and the lateral vibration device B3, respectively, so as to input the pressure and flow rate of the high-pressure liquid of the coiled tubing and the axial vibration device 5 through the hydraulic pump station 7 of the control cabinet 14, thereby controlling the internal pressure of the coiled tubing and the vibration frequency and amplitude of the axial vibration device; controlling the rotation speed of the vibration motors 103 of the lateral vibration device A1 and the lateral vibration device B3 through the control cabinet 14, thereby controlling the vibration frequency of the lateral vibration device A1 and the lateral vibration device B3; thereby making the internal pressure, axial vibration and lateral vibration of the coiled tubing consistent with the actual working conditions, and ensuring the accuracy of the test results.

[0057] Before the coiled tube high-cycle-low-cycle composite fatigue life test platform performs a static test to determine the static fatigue parameters of the coiled tube, the axial vibration device 5 and the hanging weight 9 below the injection head 2 are removed, a support plate 10 is installed on the injection head bracket 8 below the injection head 2, a straight die 11 is installed on the support plate 10 on one side of the injection head 2 outlet, and a bent die 12 is installed on the support plate 10 on the other side of the injection head 2 outlet.

[0058] When the coiled tube high-cycle-low-cycle composite fatigue life test platform performs a static test to determine the static fatigue parameters of the coiled tube, after the coiled tube port below the injection head 2 is closed, the specifications of the gooseneck tube 4 are selected as required, and the selected gooseneck tube 4 is installed on the injection head bracket 8 above the injection head 2; the rotation speed of the lateral vibration device B3 and the output pressure of the hydraulic pump station 7 to the coiled tube are set on the control cabinet 14 as required; the adjustment hole 111 into which the pin shaft 109 is inserted is selected as required, and the pin shaft 109 is inserted into the selected adjustment hole 111; after the adjustment is completed, the vibration motor 103 of the lateral vibration device B3 and the hydraulic pump station 7 are respectively started through the control cabinet 14 to respectively supply pressure to the coiled tube. After the hydraulic pump station 7 is started, high-pressure liquid is injected into the coiled tube, so that the pressure of the high-pressure liquid in the coiled tube reaches the test requirement; after the high-pressure liquid is injected into the coiled tube, the vibration motor 103 of the lateral vibration device B3 is started, and the vibration motor 103 of the lateral vibration device B3 drives the tube clamp to vibrate through the reducer 108, the turntable 104, the pin 109, and the push rod 106 in sequence, thereby driving the coiled tube under the injection head 2 to move horizontally through the tube clamp, so that the coiled tube is repeatedly bent and straightened between the bending die 12 and the straight die 11 during the lateral movement. The low-cycle fatigue behavior of the continuous tube is studied, the continuous tube is subjected to a bending and straightening test, and the fatigue parameters of the continuous tube after continuous bending and straightening are measured.

[0059] The test platform can perform bending and straightening tests on the coiled tube by using the lateral vibration device B3 in conjunction with the straight die 11 and the bending die 12, and then measure the static fatigue parameters of the coiled tube, ensuring that a simple low-cycle fatigue test can be performed when the test machine is not running.

[0060] Example 3

[0061] The coiled tubing high-cycle-low-cycle composite fatigue life test platform is composed of a lateral vibration device A1, an injection head 2, a lateral vibration device B3, a gooseneck tube 4, an axial vibration device 5, a roller 6 and a hydraulic pump station 7. An injection head 2 is installed on one side of the lateral vibration device A1 through an injection head bracket 8, so that the injection head 2 drives the coiled tubing to move downward, thereby simulating the process of the injection head injecting the coiled tubing into the well; a lateral vibration device B3 is arranged on the lower side of the injection head 2, and the functions of the lateral vibration device A1 and the lateral vibration device B3 are to respectively drive the coiled tubing to vibrate laterally through the lateral vibration device A1 and the lateral vibration device B3.

[0062] A gooseneck 4 is mounted on the injection head bracket 8 above the injection head 2 by fixing bolts. The gooseneck 4 can be replaced to study the fatigue life of the continuous pipe under different bending radii.

[0063] An axial vibration device 5 is provided below the injection head 2 to make the coiled tubing axially vibrate through the axial vibration device 5, so as to test the high cycle fatigue life of the coiled tubing through the axial vibration device 5; the axial vibration device 5 is composed of a symmetrically arranged shell 501, an end cover 502 and a piston 503, the shells 501 are fixedly connected by an outer flange and fixing bolts, a semicircular assembly groove 507 is provided on the shell 501, a flow groove 508 is provided on the assembly groove 507, and a sealing groove 509 is provided on the shell 501 at the end of the assembly groove 507; the shells 501 are fixedly connected by an outer flange and fixing bolts, and a semicircular assembly groove 507 is provided on the shell 501. The flow groove 508 is provided on the assembly groove 507. The shell 501 is provided with a sealing groove 509 at the end of the assembly groove 507. The hole is installed with a rubber pad 504, which is connected to the continuous pipe through the rubber pad 504 to increase the friction between the rubber pad 504 and the continuous pipe, so that the axial vibration device 5 drives the continuous pipe to vibrate, and the rubber pad 504 ensures the transmission of force between the axial vibration device 5 and the continuous pipe; a piston 503 is installed on the outer side of the shell 501 through the end cover 502; an oil inlet 505 and an oil outlet 506 are arranged on the end cover 502, and the end cover 502 is connected to the hydraulic pump station 7 through the oil inlet 505 and the oil outlet 506; the cross section of the piston 503 is semicircular, and the piston 503 is respectively connected to the assembly The groove 507 is slidably sealed and connected with the end cover 502; a connecting hole A510 is provided on the circumferential surface of the piston 503, and the connecting hole A510 is intermittently connected with the oil inlet 505 through the sealing groove 509; a connecting hole B511 is provided on the circumference of the piston 503 on one side of the connecting hole A510, and the connecting hole B511 is intermittently connected with the oil outlet 506 through the flow groove 508; a piston flange 512 is provided on the end of the circumferential surface of the piston 503 on the other side of the connecting hole A510, and the piston flange 512 is slidably sealed and connected with the sealing groove 509; a piston 503 end surface on one side of the piston flange 512 is provided There is a countersunk hole 513, which is connected to the communication hole A510 and the communication hole B511 respectively; the position of the piston 503 in the housing 501 has two states: 1. The communication hole A510 on the piston 503 is connected to the sealing groove 509 and the countersunk hole 513 respectively, and the communication hole B511 on the piston 503 is connected to the countersunk hole 513 and sealed with the assembly groove 507; 2. The communication hole A510 on the piston 503 is connected to the countersunk hole 513 and sealed with the assembly groove 507 respectively, and the communication hole B511 on the piston 503 is connected to the circulation groove 508 and the countersunk hole 513;When the position of the piston 503 is in state 1, the high-pressure liquid enters the sealing groove 509 between the assembly groove 507 and the piston flange 512 from the oil inlet 505 on the end cover 502, and the high-pressure liquid entering the sealing groove 509 enters the counterbore 513 from the connecting hole A510, and then enters the sealing groove 509 on the end face of the piston 503 from the counterbore 513, so that the piston 503 is pushed to move toward the circulation groove 508 under the action of the pressure and the inertia of the piston 503, so that the connecting hole A510 of the piston 503 is gradually sealed with the assembly groove 507 and the connecting hole B511 is gradually connected with the circulation groove 508, and the piston 503 is pressed against the piston 503. This causes the position of the piston 503 to change from state 1 to state 2. After the position of the piston 503 changes from state 1 to state 2, the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 flows out through the connecting hole B511, the flow groove 508, and the oil outlet 506 on the end cover 502 under the action of pressure, so that the pressure of the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 is restored to a low-pressure state; when the position of the piston 503 is in state 2, the high-pressure liquid enters the sealing groove 509 between the assembly groove 507 and the piston flange 512 from the oil inlet 505 on the end cover 502, so that the seal between the assembly groove 507 and the piston flange 512 is The pressure of the high-pressure liquid in the groove 509 gradually increases. Since the pressure of the high-pressure liquid in the sealing groove 509 on one side of the end face of the piston 503 and the counterbore 513 is in a low-pressure state, the pressure of the high-pressure liquid in the sealing groove 509 between the assembly groove 507 and the piston flange 512 gradually increases. Under the action of the high-pressure liquid pressure, the piston flange 512 is pushed away from the flow groove 508, thereby driving the piston 503 to move. During the movement of the piston 503, under the action of the high-pressure liquid pressure and the inertia of movement, the connecting hole A510 of the piston 503 is gradually connected with the sealing groove 509 and the connecting hole B511 is gradually sealed with the assembly groove 507, so that the position of the piston 503 changes from state 2 to state 3. Transform to state 1, and repeat in this way. When the piston 503 is transformed between state 1 and state 2 under the action of high-pressure liquid, the high-pressure liquid pushes the piston 503 to perform axial reciprocating motion, thereby causing the piston 503 to vibrate axially, thereby causing the housing 501 to vibrate axially, so that the housing 501 can drive the continuous tube to vibrate axially through the rubber pad 504; by adjusting the pressure and flow rate of the high-pressure liquid input into the axial vibration device 5 by the hydraulic pump station 7, the speed and amplitude of the movement of the piston 503 can be adjusted, and then the axial amplitude and frequency of the axial vibration device 5 can be adjusted, and then the axial oscillation device 5 can drive the continuous tube to vibrate through adjustment, thereby ensuring the accuracy of the detection result. ;

[0064] A hanging weight 9 is arranged below the axial vibration device 5; a roller 6 is arranged on the other side of the transverse vibration device A1, and a plurality of winding grooves 601 are arranged on the roller 6, so that the continuous pipes of different specifications can be wound through the plurality of winding grooves 601, so as to facilitate fatigue testing of the continuous pipes of different specifications; a fixture 602 for fixing the end of the continuous pipe is arranged on the winding groove 601, and the continuous pipe that does not need to be tested is prevented from scattering by the fixture 602 during the rotation of the roller 6; a roller motor 604 is connected to the rotating shaft 603 of the roller 6, so that the roller 6 can be driven to rotate by the roller motor 604, so as to facilitate fatigue testing of the continuous pipes of different specifications; a fixing device 602 for fixing the end of the continuous pipe is arranged on the winding groove 601, and the continuous pipe that does not need to be tested is prevented from scattering by the fixing device 602 during the rotation of the roller 6; a roller motor 604 is connected to the rotating shaft 603 of the roller 6, so as to drive the roller 6 to rotate through the roller motor 604, so as to facilitate fatigue testing of the continuous pipes of different specifications; The continuous tube is unwound or wound during the rotation process; a hydraulic cylinder 605 for driving the roller 6 to move axially is arranged on the base of the roller 6, so that when the hydraulic cylinder 605 drives the roller 6 to move axially and the roller 6 unwinds or winds the continuous tube, the continuous tube can be wound evenly on the roller 6 when winding, or the continuous tube can be unwound at a uniform speed on the roller 6 when unwinding; the rotating shaft 603 of the roller 6 is a hollow cylinder with one end closed, and the other end of the rotating shaft 603 of the roller 6 is provided with a flexible joint 606, and the rotating shaft 603 inside the roller 6 is provided with a connector 607 for connecting the continuous tube The coiled tubing is connected to the flexible joint 606 through the connector 607 and the rotating shaft 603 in sequence, and then the high-pressure liquid is injected into the coiled tubing through the flexible joint 606, the rotating shaft 603 and the connector 607 in sequence, so that the internal pressure is formed in the coiled tubing to simulate the internal pressure of the drilling fluid on the coiled tubing under actual working conditions; a hydraulic pump station 7 is arranged on the side of the drum 6, and the hydraulic pump station 7 is connected to the drum 6 and the axial vibration device 5 through a connecting pipe, specifically: the hydraulic pump station 7 is connected to the oil inlet 505 and the oil outlet 506 of the axial vibration device 5 through the connecting pipe, so that the hydraulic pump station 7 can pump oil to the axial vibration device 5 through the oil inlet 505. The hydraulic pump station 7 is connected with the hydraulic cylinder 605 and the flexible joint 606 of the drum 6 through the connecting pipe, so that the hydraulic pump station 7 drives the hydraulic cylinder 605 to move, and can sequentially inject high-pressure liquid into the continuous pipe through the connecting pipe, the flexible joint 606, the rotating shaft 603, and the connecting head 607, so that internal pressure is formed in the continuous pipe; the function of the flexible joint 606 is to prevent the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from rotating through the flexible joint 606 during the rotation of the rotating shaft 603, thereby preventing the connecting pipe between the flexible joint 606 and the hydraulic pump station 7 from being broken.

[0065] The coiled tubing high-cycle-low-cycle composite fatigue life test platform also includes a control cabinet 14, a control unit of which is electrically connected to the drum motor 604, the hydraulic pump station 7, the injection head 2, the lateral vibration device A1, and the vibration motor 103 of the lateral vibration device B3, respectively, so as to input the pressure and flow rate of the high-pressure liquid of the coiled tubing and the axial vibration device 5 through the hydraulic pump station 7 of the control cabinet 14, thereby controlling the internal pressure of the coiled tubing and the vibration frequency and amplitude of the axial vibration device; and controlling the rotation speed of the vibration motor 103 of the lateral vibration device A1 and the lateral vibration device B3 through the control cabinet 14, thereby controlling the vibration frequency of the lateral vibration device A1 and the lateral vibration device B3, thereby ensuring the accuracy of the test results.

[0066] Before the coiled tubing high-cycle-low-cycle composite fatigue life test platform is used to study the buckling behavior and determine the buckling parameters of the coiled tubing, the hanging weight 9 below the axial vibration device 5 is removed from the coiled tubing, and a simulated wellbore 13 is set below the injection head 2 so that the injection head 2 can lower the coiled tubing into the simulated wellbore 13.

[0067] When the coiled tube high-cycle-low-cycle composite fatigue life test platform is used to study the buckling behavior, after the coiled tube port below the injection head 2 is closed, the specifications of the gooseneck tube 4 are selected as needed, and the selected gooseneck tube 4 is installed on the injection head bracket 8 above the injection head 2; the output pressure of the hydraulic pump station 7 to the coiled tube is set on the control cabinet 14 as needed; after the adjustment is completed, the hydraulic pump station 7 is started through the control cabinet 14 to supply oil to the coiled tube and the axial vibration device 5 respectively, and the roller motor 604 is started; after the hydraulic pump station 7 is started, the high-pressure liquid is first injected into the coiled tube to make the pressure of the high-pressure liquid in the coiled tube meet the test requirements; secondly, after the high-pressure liquid is injected into the coiled tube, the hydraulic pump station 7 supplies oil to the axial vibration device 5, so that the axial vibration device 5 drives the coiled tube to vibrate; after the roller motor 604 is started, the roller motor 604 drives the roller 6 to rotate through the rotating shaft 603, so that the roller 6 The coiled tubing is unwound and outputted to the simulated wellbore 13 through the injection head 2. During the process of continuously outputting the coiled tubing into the simulated wellbore 13, after the end of the coiled tubing reaches the bottom of the simulated wellbore 13, the coiled tubing cannot continue to move downward. During the process of the injection head 2 continuing to lower the coiled tubing into the simulated wellbore 13, the coiled tubing will buckle in the simulated wellbore. When the coiled tubing contacts the inner wall of the simulated wellbore 13 during the buckling process, the friction between the coiled tubing and the simulated wellbore 13 will prevent the coiled tubing from continuing to move to the bottom of the simulated wellbore (friction resistance between the coiled tubing and the simulated wellbore 13). After the coiled tubing is buckled in the simulated wellbore 13, the high-pressure liquid pressure and flow rate of the axial vibration device 5 supplied by the hydraulic pump station 7 are changed, and the vibration frequency and amplitude of the axial vibration device 5 are changed to test the fatigue parameters after buckling and the influence of the axial vibration on the friction resistance between the coiled tubing and the simulated wellbore 13.

[0068] The test platform can study the buckling behavior of the coiled tubing by using the axial vibration device 5 in conjunction with the simulated wellbore 13, and further determine the buckling fatigue parameters of the coiled tubing and the parameters of the influence of vibration on the friction between the coiled tubing and the inner wall of the wellbore, thereby performing multi-faceted measurements on the coiled tubing, solving the problem that the existing fatigue testing machine can only perform low-cycle fatigue tests, and providing a multifunctional testing device.

Claims

1. A coiled tubing high-cycle-low-cycle composite fatigue life test platform, comprising a lateral vibration device A (1), an injection head (2), a lateral vibration device B (3), a gooseneck tube (4), an axial vibration device (5), a roller (6) and a hydraulic pump station (7), characterized in that: An injection head (2) is mounted on one side of the transverse vibration device A (1) via an injection head bracket (8), and a transverse vibration device B (3) is arranged on the lower side of the injection head (2); a gooseneck tube (4) is mounted on the injection head bracket (8) above the injection head (2) via fixing bolts, an axial vibration device (5) is arranged below the injection head (2), and a hanging weight (9) is arranged below the axial vibration device (5); a roller (6) is arranged on the other side of the transverse vibration device A (1), and a hydraulic pump station (7) is arranged on the side of the roller (6), and the hydraulic pump station (7) is connected to the roller (6) and the axial vibration device (5) respectively via connecting pipes; The axial vibration device (5) is composed of a symmetrically arranged housing (501), an end cover (502) and a piston (503); the housings (501) are fixedly connected via an outer flange and fixing bolts; a rubber pad (504) is installed between the housings (501) via an assembly hole; a piston (503) is installed on the outer side of the housing (501) via the end cover (502); an oil inlet (505) and an oil outlet (506) are provided on the end cover (502); the end cover (502) is connected to the hydraulic pump station (7) via the oil inlet (505) and the oil outlet (506); The housing (501) is provided with a semicircular assembly groove (507), the assembly groove (507) is provided with a flow groove (508), and the housing (501) at the end of the assembly groove (507) is provided with a sealing groove (509); The cross section of the piston (503) is semicircular, and the piston (503) is respectively connected to the assembly groove (507) and the end cover (502) in a sliding and sealing manner; a connecting hole A (510) is provided on the circumferential surface of the piston (503), and the connecting hole A (510) is intermittently connected to the oil inlet (505) through the sealing groove (509); a connecting hole B (511) is provided on the circumference of the piston (503) on one side of the connecting hole A (510), and the connecting hole B (511) ) is intermittently connected to the oil outlet (506) through the circulation groove (508); a piston flange (512) is provided at the end of the circumferential surface of the piston (503) on the other side of the connecting hole A (510), and the piston flange (512) is connected to the sealing groove (509) in a sliding and sealing manner; a countersunk hole (513) is provided on the end surface of the piston (503) on one side of the piston flange (512), and the countersunk hole (513) is respectively connected to the connecting hole A (510) and the connecting hole B (511).

2. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 1, characterized in that: The lateral vibration device A (1) and the lateral vibration device B (3) are respectively composed of a support (101), a support platform (102), a vibration motor (103), a turntable (104), a guide rail (105), a push rod (106) and a pipe clamp. The support platform (102) is mounted on the support (101) via uniformly arranged buffer springs (107). The vibration motor (103) is arranged on the support platform (102). The turntable (104) is mounted on the output shaft of the vibration motor (103) via a reducer (108). A push rod (106) is mounted on the support (101) at the front end of the turntable (104) via a guide rail (105). The push rod (106) is movably connected to the turntable (104) via a pin shaft (109). A pipe clamp is arranged at the end of the push rod (106).

3. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 2, characterized in that: The guide rail (105) of the lateral vibration device A (1) is C-shaped, and the push rod (106) is movably plugged and connected to the two end heads of the guide rail (105) of the lateral vibration device A (1); the guide rail (105) of the lateral vibration device B (3) is a rod-shaped body arranged in parallel, and the push rod (106) is movably plugged and connected to the rod-shaped body of the lateral vibration device B (3); the push rod (106) between the two end heads of the guide rail (105) of the lateral vibration device A (1) and between the rod-shaped bodies of the lateral vibration device B (3) is respectively provided with a slide groove (110), and the slide groove (110) is movably connected to the pin shaft (109).

4. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 2, characterized in that: The rotating disk (104) is provided with a plurality of adjustment holes (111) in a radial direction, and the adjustment holes (111) are fixedly connected to the pin shaft (109).

5. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 2, characterized in that: The pipe clamp is composed of connecting plates (112), connecting rods (113) and arc-shaped rollers (114) arranged in parallel. The connecting plates (112) are fixedly connected by the connecting rods (113). The inner sides of the connecting plates (112) are movably mounted with arc-shaped rollers (114) via pins. The connecting plates (112) are hinged to the push rods (106). A caliper (115) is further provided between the push rod (106) and the connecting plate (112). One end of the caliper (115) is hinged to the connecting plate (112), and the other end of the caliper (115) is evenly distributed with positioning holes (116). The caliper (115) is fixedly connected to the push rod (106) via fixing bolts and the positioning holes (116).

6. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 1, characterized in that: A support plate (10) is provided on the injection head bracket (8) below the injection head (2), a straight die (11) is provided on the support plate (10) on one side of the injection head (2) outlet, and a curved die (12) is provided on the support plate (10) on the other side of the injection head (2) outlet.

7. The coiled tube high-cycle-low-cycle composite fatigue life test platform according to claim 1, characterized in that: A simulated wellbore (13) is arranged below the axial vibration device (5).

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