A pipe string vehicle and a pipe string construction method for an oil field wellhead

Abstract

The embodiment of the present application discloses a pipe string vehicle and a pipe string construction method for an oilfield wellhead, comprising: a vehicle body; a truss body, the truss body is rotatably arranged on the vehicle body, and is used to fix the pipe string; a guide rail, the guide rail is connected to the truss body; a fixing seat, the fixing seat is slidably connected to the guide rail, and is located at the rear end of the truss body along the travel direction; and a fixing member, the fixing member is arranged on the fixing seat, and is used to be detachably connected to the pipe string to fix the pipe string; the pipe string vehicle has a transport state and an installation state, in the transport state, the truss body is placed horizontally on the vehicle body; in the installation state, the truss body is erected, and when the fixation between the truss body and the pipe string is released, the fixing seat can slide up and down along the extension direction of the truss body. The pipe string vehicle and the pipe string construction method for an oilfield wellhead of the embodiment of the present application can solve the installation problem of working tools of different lengths during the installation process.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas exploitation, and in particular to a pipe string vehicle and a pipe string construction method at an oil field wellhead. Background Art

[0002] The pipe string, or blowout preventer assembly, is generally installed at the oil wellhead. The coiled tubing injector is installed on the top of the blowout preventer assembly. The coiled tubing connected to the coiled tubing injector passes through the pipe string and extends from the oil wellhead into the well.

[0003] Usually, the pipe string is transported to the wellhead of the oil field by a transport vehicle and then installed by lifting. Due to the limitation of the wellhead site, the different lengths of the various operating components of the pipe string, the large space occupied, and the lack of tools make the installation of the pipe string difficult. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a pipe string vehicle and a pipe string construction method for an oil field wellhead, which can solve the installation problem of working tools of different lengths during the installation process.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A first aspect of an embodiment of the present application provides a pipe string vehicle for transporting and installing pipe strings, comprising: a vehicle body; a truss body, which is rotatably arranged on the vehicle body and is used to fix the pipe strings; a guide rail, which is connected to the truss body; a fixing seat, which is slidably connected to the guide rail and is located at the rear end of the truss body along the travel direction; and a fixing member, which is arranged on the fixing seat and is used to be detachably connected to the pipe string to fix the pipe string; the pipe string vehicle has a transport state and an installation state, in which the truss body is placed horizontally on the vehicle body; in the installation state, the truss body is upright, and when the fixation of the truss body and the pipe string is released, the fixing seat can slide up and down along the extension direction of the truss body.

[0007] In one embodiment, the pipe string vehicle includes a height limiting device disposed on the truss body, and the height limiting device can abut against the fixing seat to limit its sliding distance.

[0008] In one embodiment, the height limit device includes: a pull rod, a spring cylinder and a rotating seat with a rotation center; the piston rod of the spring cylinder is connected to the pull rod; the rotating seat is hinged to the pull rod, and the rotating seat is rotatably connected to the truss body to form the rotation center; the height limit device is configured as follows: when the fixed seat rises along the truss body, the fixed seat pushes the rotating seat to rotate around the rotation center, the rotating seat drives the pull rod to move downward, and the piston rod of the spring cylinder retracts; when the fixed seat rises along the truss body to the first position that separates the fixed seat from the rotating seat, the piston rod of the spring cylinder extends outward under the action of elastic force and drives the pull rod to move upward, and the pull rod drives the rotating seat to reset, so that the rotating seat remains in a limited state where it can abut against the fixed seat.

[0009] In one embodiment, the height limiting device includes a plurality of rotating seats, and the plurality of rotating seats are arranged at intervals along the height direction of the truss body, and each of the rotating seats is hinged to the pull rod respectively to form the rotation center of each rotating seat.

[0010] In one embodiment, when the rotating seat is in the limited state, when the piston rod of the spring cylinder retracts under the action of the hydraulic oil, the piston rod of the spring cylinder drives the pull rod to move downward, and the pull rod drives the rotating seat to rotate, so that the rotating seat switches from the limited state to the avoidance state of avoiding the fixed seat.

[0011] In one embodiment, a union is provided at the end of the pipe string, and the fixing piece is threadedly connected to the union; the fixing piece is a flange, and the flange includes a disc body and a boss provided on one side of the disc body; one end of the pipe string provided with the union penetrates into the fixing seat from one side of the fixing seat, and the boss penetrates into the fixing seat from the other side opposite to the fixing seat and is threadedly connected to the union; the disc body is located outside the fixing seat and is tightly connected to the fixing seat.

[0012] In one embodiment, the fixing member is a locking pin cylinder, which includes a locking pin cylinder barrel, a locking pin piston rod arranged in the locking pin cylinder barrel, and a locking pin shaft arranged on the locking pin piston rod. A plug-in groove is radially arranged in the pipe string. When the locking pin piston rod extends axially along the locking pin cylinder barrel, the locking pin shaft is plugged into and matched with the plug-in groove.

[0013] In one embodiment, the pipe string vehicle includes a radial limiting assembly, and the radial limiting assembly includes a first limiting member and a second limiting member. The first limiting member is clamped between the guide rail and the truss body, and the second limiting member is arranged on the fixed seat and is located on the side of the fixed seat away from the guide rail. When the pipe string is loaded on the truss body, part of the structure of the pipe string is passed through the fixed seat, and the first limiting member cooperates with the second limiting member to limit the radial movement of the pipe string.

[0014] In one embodiment, the pipe string vehicle includes a mounting seat, two sets of connecting components and two guide rails; the two guide rails are arranged at intervals along the lateral direction of the truss body; the mounting seat is arranged on the truss body, and the mounting seats are respectively arranged at opposite ends of each guide rail along the extension direction, the mounting seat on at least one guide rail can adjust the lateral position relative to the truss body to adjust the lateral spacing between the two guide rails, and the mounting seat on at least one guide rail can adjust the vertical position relative to the truss body to adjust the vertical spacing between the two guide rails; two sets of connecting components are slidably connected to the two guide rails in a one-to-one correspondence; the fixed seat is connected to the two sets of connecting components.

[0015] In one embodiment, the pipe string vehicle includes a working platform and a hoisting mechanism; the hoisting mechanism includes a hoist and a wire rope wound on the hoist, the hoist is arranged on the fixed seat, the working platform has a storage state stored on the fixed seat and a working state suspended under the fixed seat, the wire rope is retracted and released to drive the working platform to switch between the storage state and the working state; when the pipe string vehicle is in the transport state, the working platform is in the storage state, the pipe string vehicle is in the installation state, and the working platform is in the working state.

[0016] In one embodiment, the pipe string vehicle includes a pipe string claw arranged on the truss body, and the pipe string claw includes: a base, two claw poles and a claw cylinder; one end of each claw pole has a first leg and a second leg, and the first leg is hinged to the base at a first hinge point; the two claw poles are arranged opposite to each other and can be in an open state or a clamped state relative to the base; the two ends of the claw cylinder are respectively hinged to the second legs of the two claw poles at the second hinge point; the claw cylinder can drive the two claw poles to switch between an open state and a clamped state.

[0017] A second aspect of the embodiment of the present application provides a pipe string construction method for an oil field wellhead, comprising:

[0018] Preassemble a pipe string; fix the pipe string to the truss body of the pipe string vehicle; when the pipe string vehicle is in an installation state, erect the truss body to make the pipe string stand upright; install an injection head on the upper end of the pipe string; suspend the pipe string; loosen the fixation between the truss body and the pipe string, adjust the height of the pipe string from the ground to form an installation space, and the fixing seat rises or falls along the vertical direction with the pipe string; install an operating tool on the pipe string in the installation space; release the fixation between the pipe string and the fixing member, and transport the pipe string to the wellhead of the oil field.

[0019] A pipe string vehicle and a pipe string construction method for an oil field wellhead in an embodiment of the present application are provided with a vehicle body, a truss body, a guide rail, a fixing seat and a fixing part. The fixing part is provided on the fixing seat and is used to be detachably connected to the pipe string to fix the pipe string. When the pipe string vehicle is in an installed state, the truss body stands upright on the vehicle body. When the fixation between the truss body and the pipe string is released, the fixing seat can slide up and down along the extension direction of the truss body, thereby facilitating the adjustment of the distance from the lower end of the pipe string to the ground, and further facilitating the installation of working tools of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the pipe string vehicle according to an embodiment of the present application, wherein the pipe string vehicle is in a transport state;

[0021] Figure 2 This is a schematic diagram of the structure of a pipe string vehicle according to an embodiment of the present application, wherein the pipe string vehicle is in an installation state;

[0022] Figure 3 for Figure 2 Right view of;

[0023] Figure 4 This is a schematic diagram of the structure of a pipe string vehicle according to an embodiment of the present application, wherein the pipe string vehicle is in a transport state and the pipe string is omitted;

[0024] Figure 5 for Figure 4 Schematic diagram of the cooperation relationship between the working platform and the truss body shown in the figure, the working platform shown in the figure is in a working state, and the guide rail is also shown in the figure;

[0025] Figure 6 for Figure 5 The schematic diagram of the matching relationship between the working platform and the fixed seat shown;

[0026] Figure 7 for Figure 4 The structural diagram of the height limiting device shown in FIG.

[0027] Figure 8 for Figure 4A schematic diagram of a matching relationship between the height limit device and the fixed seat shown in the figure, which shows the state when the fixed seat pushes the rotating seat to rotate around the rotation center during the rising process;

[0028] Fig. 9 for Figure 4 A schematic diagram of a second matching relationship between the height limiting device and the fixed seat shown in the figure, which shows the state when the fixed seat and the rotating seat are in contact;

[0029] Fig.10 for Figure 4 A schematic diagram of a third matching relationship between the height limiting device and the fixed seat shown in FIG. 1 , in which the fixed seat is in the second position and the rotating seat is in an avoidance state;

[0030] Fig.11 for Figure 1 A partial enlarged view of the middle A;

[0031] Fig.12 for Fig.11 The schematic diagram of the matching relationship between the lock pin cylinder and the sleeve assembly is shown in

[0032] Fig.13 This is the front view of the flange;

[0033] Fig.14 for Fig.13 A top view of

[0034] Fig.15 for Fig.13 A cross-sectional view of

[0035] Fig.16 for Figure 1 A schematic diagram of the matching relationship between the shift lever and the fixing seat is shown in the figure, and a second limiting member is shown in the figure;

[0036] Fig.17 for Figure 1 The installation diagram of the guide rail shown in FIG.

[0037] Fig.18 for Fig.17 A top view of the guide rail shown in FIG.

[0038] Fig.19 for Fig.18 A partial enlarged view of point D in the middle;

[0039] Fig. 20 for Fig.18 A partial enlarged view of point B in the middle;

[0040] Fig.21 for Fig.17 A left side cross-sectional view of the structure shown in;

[0041] Fig. 22 for Fig.21 A partial enlarged view of point C in the middle;

[0042] Fig.23 It is a schematic diagram of the matching relationship between the fixing seat and the connecting component;

[0043] Fig.24 for Figure 8 A top view of

[0044] Fig.25 It is a front view of the pipe string clamping claw of the embodiment of the present application, wherein the pipe string clamping claw is in an open state;

[0045] Fig.26 for Fig.25 A top view of

[0046] Fig. 27 This is a front view of the pipe string clamping claw of the embodiment of the present application, wherein the pipe string clamping claw is in a clamping state;

[0047] Fig.28 This is a flow chart of a pipe string construction method for an oil field wellhead according to an embodiment of the present application. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed descriptions in the specific implementation methods should be understood as explanations of the present application and should not be regarded as improper limitations on the present application.

[0049] In the description of the embodiments of the present application, "upper" and "lower" are based on the attached Figure 8 The directions or positional relationships shown; the directions or positional relationships of “left”, “right”, “front” and “back” are based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] A pipe string vehicle, such as Figures 1 to 28 As shown, it is used to transport a pipe string 900 and includes: a vehicle body 100 , a truss body 110 , a guide rail 120 , a fixing seat 130 and a fixing member 410 .

[0051] The truss body 110 is rotatably disposed on the vehicle body 100 for fixing and carrying the pipe string 900; the guide rail 120 is connected to the truss body 110; the fixing seat 130 is slidably connected to the guide rail 120, so that the fixing seat 130 can slide relative to the truss body 110, and the fixing member 410 is disposed on the fixing seat 130 for being detachably connected to the pipe string 900 to fix the pipe string 900, thereby realizing the relative fixation of the fixing seat 130 and the pipe string 900.

[0052] The pipe string vehicle has a transport state and an installation state. In the transport state, the truss body 110 is placed horizontally on the vehicle body 100, the truss body 110 is fixed to the pipe string 900, and the truss body 110 bears the entire weight of the pipe string 900; in the installation state, the truss body 110 is erected on the vehicle body 100, the fixation of the truss body 110 and the pipe string 900 is released, and the fixing seat 130 can slide up and down along the extension direction of the truss body 110, so as to facilitate the adjustment of the distance from the lower end of the pipe string 900 to the ground, and then facilitate the installation of different working tools.

[0053] Specifically, see Figures 1 to 4 ,as well as Figures 11 to 15 The vehicle body 100 bears the weight of all other components and has a corresponding power mechanism to transport the components and the pipe string 900 for transfer. Guardrails and fenders are provided on both sides of the vehicle body 100. The guardrails can ensure that personnel are isolated from the truss body 110, the guide rail 120, the fixing seat 130 and the fixing member 410 to ensure the safety of personnel when the above components are working; the fenders prevent mud from splashing during the travel process.

[0054] The truss body 110 is rotatably disposed on the vehicle body 100, and is used to fix and carry the pipe string 900. The pipe string 900 is a pipe body assembly having a certain axial length, and corresponding components, such as a blowout preventer 920, a dynamically sealed blowout preventer box 930, and a statically sealed blowout preventer 940, etc., have been pre-installed before leaving the factory. The truss body 110 is a structural frame having a certain axial length. The guide rail 120 is connected to the truss body 110; the fixing seat 130 is slidably disposed on the guide rail 120, and the fixing piece 410 is disposed on the fixing seat 130, and is used to be detachably connected to the pipe string 900 to fix the pipe string 900, that is, the fixing seat 130 can rise or fall axially relative to the truss body 110 along the guide rail 120; part of the structure of the pipe string 900, such as the lower end of the pipe string 900, is partially penetrated and fixed in the fixing seat 130; the pipe string 900 and the fixing piece 410 The pipe string 900 is detachably connected so that the pipe string 900 remains fixed to the fixing seat 130, and the fixing seat 130 rises or falls on the guide rail 120 along the extension direction (that is, the axial direction) of the truss body 110, thereby driving the pipe string 900 fixed relatively to the fixing seat 130 to rise or fall axially relative to the truss body 110, so that the staff can install working tools of different lengths on the pipe string 900 in a suitable installation space, for example, install them in the continuous oil pipe extending from the pipe string 900.

[0055] When the pipe string vehicle carries the pipe string 900 and transports it to the destination, the pipe string vehicle is in a transporting state of transporting the pipe string 900, the truss body 110 is placed horizontally, the truss body 110 leans against the vehicle body 100 in a nearly horizontal position, the truss body 110 and the pipe string 900 remain fixed, and the truss body 110 bears the entire weight of the pipe string 900; the rear end of the pipe string 900 is detachably fixed to the fixing member 410 as an axial limiter, so that the pipe string 900 is relatively fixed to the fixing seat 130. Specifically, the pipe string 900 is fixed to the truss body 110 in an almost parallel manner, the truss body 110 and the pipe string 900 remain fixed, and the weight of the pipe string 900 is borne by the truss body 110, and the truss body 110 can be provided with a pipe string claw 700 (mentioned below) to fix the radial direction of the pipe string 900, that is, the pipe string 900 also maintains a nearly horizontal posture, and the weight is transmitted downward to the vehicle body 100 through the truss body 110. The fixing seat 130 is located at the rear end of the truss body 110 along the driving direction, and the rear end of the pipe string 900 is fixed by the fixing member 410. The pipe string 900 and the fixing seat 130 are bound together by the fixing member 410, so that the bottom end of the pipe string 900 can be fixed to the fixing seat 130, and the fixing seat 130 remains fixed relative to the guide rail 120, thereby preventing the pipe string 900 from moving along the extension direction of the guide rail 120. When the pipe string vehicle encounters emergency braking, downhill driving or turning on a curve during transportation, the fixing member 410 as an axial limiting device applies an axial limiting effect to the pipe string 900, and the pipe string 900 will not move forward due to inertia, thereby improving the driving safety of the pipe string vehicle.

[0056] It should be understood that in each embodiment of the present application, the extension direction of the truss body 110 is the axial direction, the end of the vehicle body 100 facing forward along the driving direction is the front end, and the end of the vehicle body 100 facing backward away from the driving direction is the rear end, and the fixing seat 130 is located at the rear end of the truss body 110 along the driving direction.

[0057] See also Figure 2When the pipe string vehicle transports the pipe string 900 to the destination for operation, the destination is usually the wellhead of the oil field. The pipe string vehicle is in the installation state. The truss body 110 is rotated around the vehicle body 100 to a vertical state, so that the pipe string 900 is rotated to a vertical state accordingly. The injection head is lifted and installed on the upper end of the pipe string 900 by an external crane, and then the pipe string 900 is lifted by the crane. At this time, the weight of the pipe string 900 is mainly borne by the crane, and the fixation of the truss body 110 and the pipe string 900 is released. For example, the pipe string claw 700 on the truss body 110 for fixing the pipe string 900 is loosened. At this time, the truss body 110 is no longer fixed to the pipe string 900, so that the pipe string 900 and the truss body 110 are released, but the fixing piece 410 and the bottom end of the pipe string 900 are still fixed, and the fixing seat 130 can slide up and down along the guide rail 120 (that is, the extension direction of the truss body 110). The upper end of the pipe string 900 is connected to the crane by a rope, and the lower end is connected to the fixing seat 130 by a fixing piece 410. The positioning of the two ends can ensure that the pipe string 900 will not swing; then, according to the different lengths of the working tools to be installed at the lower end of the pipe string 900, the pipe string 900 is vertically lifted to a certain height from the ground by the crane, and an installation space M is formed between the bottom end of the pipe string 900 and the ground. The installation space M should be able to completely accommodate the working tools and should not be too long or too short, thereby effectively facilitating the installation work of the operator; in the process of operating the crane to make the pipe string 900 rise or fall, the lower end of the pipe string 900 drives the fixing piece 410 fixed thereto to rise and fall, thereby making the fixing seat 130 mounted on the guide rail 120 slide up and down along the extension direction of the truss body 110 (that is, the vertical direction), effectively preventing the lower end of the pipe string 900 from swinging left and right and affecting the installation process of the working tools. After the operation tool is installed, the fixing of the fixing member 410 can be released, so that the pipe string 900 and the fixing seat 130 are completely separated, and the pipe string 900 is hoisted to the wellhead of the oil field by a crane.

[0058] In addition, during the installation process, in the unexpected event of a crane failure, the fixing member 410 set on the fixing seat 130 can also serve as a bottom support for fixing the pipe string 900 at different heights, and cooperate with the height limit device (mentioned below) to prevent the pipe string 900 from pressing down on the operator performing the installation work below, thereby ensuring safety.

[0059] In some embodiments, the pipe string vehicle may be provided with a working platform 140 (mentioned below), which may be suspended below the fixing seat 130 , and an operator may work on the working platform 140 , thereby facilitating installation of various working tools to the bottom end of the pipe string 900 .

[0060] In some non-limiting embodiments, the pipe string vehicle may include a sub-frame 150 and a boom cylinder 160, both of which are installed on the vehicle body 100. The sub-frame 150 is generally arranged at the rear end of the vehicle body 100, that is, the end away from the front of the vehicle; the truss body 110 is connected to the sub-frame 150 and the boom cylinder 160 in the form of three hinges through the boom cylinder 160, thereby realizing the function of rotating the truss body 110 relative to the vehicle body 100. In addition, a first leg 170 capable of swinging to both sides is provided on the sub-frame 150, and a second leg 180 capable of swinging to both sides is provided on one end of the vehicle body 100 away from the sub-frame 150; when the pipe string vehicle is in a transporting state of transporting the pipe string 900, the first leg 170 and the second leg 180 are folded and tightly attached to both sides of the vehicle body 100 to avoid affecting the driving transportation; when the pipe string vehicle is in an installation state, the first leg 170 and the second leg 180 are extended to both sides and supported on the ground to increase stability and ensure safety.

[0061] When the pipe string vehicle is in the installation state and the pipe string 900 is installed, first unfold the first leg 170 and the second leg 180 and support the vehicle body 100 until the tires are off the ground, then adjust the truss body 110 to be perpendicular to the ground, lower the working platform 140, and use a crane to install the injection head on the upper end of the pipe string 900. The crane holds the pipe string 900, releases the pipe string claw 700, adjusts the height of the pipe string 900, installs the wellhead operation tool from the working platform 140 into the blowout preventer 920 of the pipe string 900, and then uses the crane to lower the pipe string 900 and the fixing seat 130 with the injection head installed to the lowest point, releases the restriction on the fixing seat 130, and uses the crane to lift the pipe string 900 with the injection head to the wellhead to complete the corresponding installation.

[0062] In some non-limiting embodiments, the hydraulic system and the control system are integrated on the vehicle body 100, the hydraulic system can provide power to the above-mentioned various hydraulic actuators, and the control system is used to coordinate the control operations of the electrical, hydraulic and other components of the pipe-string vehicle.

[0063] In the related art, a truss body and a fixed seat that can be lifted and lowered on the truss body are provided on the pipe string vehicle. When transporting the pipe string, the truss body is leaning against the body of the pipe string vehicle, and the pipe string is fixed on the truss body and detachably connected to the fixed seat. When delivering the working tool into the continuous tubing at the well site, the truss body is switched to an upright state, and the crane first lifts the continuous tubing injector to the top of the pipe string and connects it to the pipe string, and then lifts the pipe string upward. Since the fixed seat is connected to the pipe string, during the lifting process, the fixed seat will slide upward along the truss body and drive the working platform to rise together. When the pipe string is lifted to a suitable height, the operator on the working platform can send the working tool into the continuous tubing extending from the bottom of the pipe string. However, when the continuous tubing injector, pipe string, fixed seat and working platform are lifted to a certain height from the ground by the crane, there is a possibility that the components will become unstable and fall due to the failure of the crane's hoist, thereby posing a threat to the safety of the operators who install and replace the working tools on the working platform.

[0064] In the embodiment of the present application, the pipe string vehicle limits the pipe string 900 by setting a full limiting structure, and the full limiting structure includes a height limiting device 300, a fixing member 410 as an axial limiting device, and a radial limiting assembly 500.

[0065] The pipe string vehicle is in a transport state, and the fixing part 410 as an axial limiting device and the radial limiting assembly 500 respectively limit the pipe string 900 axially and radially. When the pipe string vehicle encounters emergency braking, downhill driving or turning on a curve during transportation, the fixing part 410 as the axial limiting device applies an axial limiting effect to the pipe string 900, and the pipe string 900 will not move forward due to inertia, thereby improving the driving safety of the pipe string vehicle; when the road surface is uneven and causes the pipe string vehicle to vibrate up and down, the pipe string 900 can be prevented from moving radially during transportation, thereby avoiding damage to the various structures of the pipe string vehicle and improving the driving safety of the pipe string vehicle.

[0066] The pipe string vehicle is in the installation state. By setting the height limit device 300 on the truss body 110, in the event of a crane failure and the overall instability and falling failure of all components, the height limit device 300 can abut against the fixing seat 130 to limit its sliding distance, thereby ensuring maximum safety.

[0067] In a specific embodiment, Figures 1 to 4 ,as well as Figures 7 to 10 As shown, the height limiting device 300 includes: a pull rod 3132, a spring oil cylinder 3133 and a rotating seat 3131 having a rotation center 3131a. The rotation center 3131a of the rotating seat 3131 refers to the rotation point around which the rotating seat 3131 can rotate, which can be the center of gravity of the rotating seat 3131, and for a symmetrical rotating seat 3131, its rotation center 3131a can also be the geometric center.

[0068] The piston rod 3135 of the spring oil cylinder 3133 is connected to the pull rod 3132, the rotating seat 3131 is hinged to the pull rod 3132, and the rotating seat 3131 is rotatably connected to the truss body 110 to form a rotation center 3131a; the hinge point between the rotating seat 3131 and the pull rod 3132 is not the same as the rotation center 3131a. Therefore, the spring oil cylinder 3133, the pull rod 3132 and the rotating seat 3131 of the height limit device 300 can be connected into a whole.

[0069] The height limiting device 300 is configured as follows: when the fixed seat 130 rises along the truss body 110, the fixed seat 130 pushes the rotating seat 3131 to rotate around the rotation center 3131a, the rotating seat 3131 drives the pull rod 3132 to move downward, and the piston rod 3135 of the spring cylinder 3133 retracts, that is, the rotating seat 3131 can be pushed and rotated by the fixed seat 130, and the piston rod 3135 of the spring cylinder 3133 is retracted by driving the pull rod 3132 to avoid the rise of the fixed seat 130. It should be noted that in the initial state of the spring cylinder 3133 of the embodiment of the present application, a part of the piston rod 3135 of the spring cylinder 3133 extends out of the cylinder barrel, that is, in the initial state, the elastic member in the spring cylinder 3133 is in a natural state, and when there is an external force axially compressing the spring cylinder 3133, the elastic member is compressed, and the piston rod 3135 will retract into the spring cylinder 3133. When the fixed seat 130 rises along the truss body 110 to the first position where the fixed seat 130 is separated from the rotating seat 3131, the piston rod 3135 of the spring oil cylinder 3133 extends outward under the action of elastic force and drives the pull rod 3132 to move upward, and the pull rod 3132 drives the rotating seat 3131 to reset, so that the rotating seat 3131 remains in a limited position capable of abutting against the fixed seat 130. In other words, the piston rod 3135 of the spring oil cylinder 3133 can drive the pull rod 3132 to move upward by rebounding, so that the fixed seat 130 abuts against the reset rotating seat 3131, and the downward movement of the fixed seat 130 can be limited, so as to limit the downward movement of components such as the coiled tubing injector, the pipe string and the working platform, thereby solving the risk of the overall instability and falling of each component due to the failure of the crane hoist, and improving the safety of the operation.

[0070] It should be noted that the limiting state of the rotating seat 3131 refers to the state of the rotating seat 3131 when it is reset due to the upward movement of the pull rod 3132 under the action of the spring cylinder 3133, but the abutment between the fixed seat 130 and the rotating seat 3131 is not a necessary condition for the rotating seat 3131 to be in the limiting state.

[0071] In one embodiment, please refer to Fig. 9The fixed seat 130 includes a hook portion 131 and a fixed seat body 132 , the hook portion 131 is fixedly connected to the fixed seat body 132 , and when the rotating seat 3131 is in a limited state, the fixed seat 130 abuts against the rotating seat 3131 using the hook portion 131 .

[0072] It can be understood that the hook portion 131 refers to a hook-shaped structure that can abut against the rotating seat 3131, and can be an L-shaped hook portion.

[0073] In one embodiment, please refer to Figures 8 to 10 The height limiting device 300 includes a plurality of rotating seats 3131, which are arranged at intervals along the height direction of the truss body 110, and each rotating seat 3131 is respectively hinged to the tie rod 3132 to form a rotation center 3131a of each rotating seat 3131. The hinge points of each rotating seat 3131 and the tie rod 3132 can be the same, and the rotation center 3131a of each rotating seat 3131 can be at the same position in each rotating seat 3131. The fixed seat 130 is abutted against different rotating seats 3131 to adjust the position of the fixed seat 130, so as to facilitate the operator to send working tools of different lengths into the continuous oil pipe extending from the bottom of the pipe string at different heights.

[0074] In one embodiment, please refer to Figures 8 to 10 The height limiting device 300 also includes a plurality of rotating seat limiting plates 3134, which are located on the truss body 110. The rotating seat limiting plates 3134 can be fixedly connected to the truss body 110. When the rotating seat is in a limited state, each rotating seat limiting plate 3134 abuts against the rotating seat 3131 one by one, which can improve the safety when the fixed seat 130 abuts against the rotating seat 3131.

[0075] It should be noted that when the rotating seat 3131 is in a limited state, the fixed seat 130 can abut against one end of the rotating seat 3131, and each rotating seat limiting plate 3134 abuts against the other end of the rotating seat 3131 relative to the fixed seat 130. As a result, the bending moment applied to the rotating seat 3131 by the fixed seat 130 can be offset by the bending moment applied to the rotating seat 3131 by the rotating seat limiting plate 3134, so that the rotating seat 3131 remains stable while the stability of the fixed seat 130 is also greatly improved.

[0076] It should be noted that since the spring cylinder 3133 and the pull rod 3132 in the height limiting device 300 are connected as a whole with each rotating seat 3131, the number of each rotating seat limiting plate 3134 can be the same as the rotating seat 3131, or can be less than the rotating seat 3131. That is to say, each rotating seat limiting plate 3134 stabilizes the rotating seat 3131 abutting against it, and due to the action of the pull rod 3132, the rotating seat 3131 that is not abutting against the rotating seat limiting plate 3134 is also stabilized. Therefore, the number and position of multiple rotating seat limiting plates 3134 can be set as needed.

[0077] In one embodiment, please refer to Fig.10 When the rotating seat 3131 is in the limited state, when the piston rod 3135 of the spring oil cylinder 3133 retracts under the action of the hydraulic oil, the fixed seat 130 is in a position that does not hinder the rotation of the rotating seat 3131, that is, it does not abut against the rotating seat 3131. The piston rod 3135 of the spring oil cylinder 3133 drives the pull rod 3132 to move downward, and the pull rod 3132 drives the rotating seat 3131 to rotate, so that the rotating seat 3131 switches from the limited state to the avoidance state of avoiding the fixed seat 130, which can facilitate the fixed seat 130 to rise or fall along the truss body 110 to adjust the position, so as to facilitate the installation work of the operator.

[0078] Specifically, when the fixed seat 130 descends from above the rotating seat 3131 along the truss body 110 to below the rotating seat 3131, the rotating seat 3131 is rotated by the hydraulic oil of the spring cylinder 3133, thereby switching from the limit state to the avoidance state. When the fixed seat 130 rises from below the rotating seat 3131 along the truss body 110 to above the rotating seat 3131, the rotating seat 3131 is rotated by the thrust of the fixed seat 130.

[0079] In one embodiment, please refer to Fig.10 , the fixed seat 130 is in a state of abutment with the rotating seat 3131. When the fixed seat 130 rises along the truss body 110 to the second position to avoid the rotating seat 3131, the piston rod 3135 of the spring cylinder 3133 retracts under the action of the hydraulic oil. It should be noted that the second position can be the same position as the first position in which the rotating seat 3131 is pushed to rotate and then rises and separates from the rotating seat 3131, or it can be a different position.

[0080] The piston rod 3135 of the spring oil cylinder 3133 drives the pull rod 3132 to move downward, and the pull rod 3132 drives the rotating seat 3131 to rotate, and the rotating seat 3131 switches from the limited state to the avoidance state of avoiding the fixed seat 130, so that the fixed seat 130 can freely fall along the truss body 110. It is convenient for the fixed seat 130 to rise or fall along the truss body 110 to adjust the position, so as to facilitate the installation work of the operator.

[0081] It should be noted that free descent means that when the rotating seat 3131 is in the avoidance state, the fixed seat 130 can freely descend along the truss body 110 without being constrained by any rotating seat 3131, that is, the fixed seat 130 can freely descend from the truss body 110 above the top rotating seat 3131 to the truss body 110 below the bottom rotating seat 3131.

[0082] In one embodiment, in order to make the fixed seat 130 more stable and safe, two sets of height limit devices 300 can be arranged at lateral intervals along the pipe string vehicle. When the rotating seat 3131 is in a limited state, the fixed seat 130 abuts against the rotating seats 3131 of the two sets of height limit devices 300. Multi-point limiting can make the fallen pipe string 900, the fixed seat 130 and the working platform 140 more stable and prevent it from tipping over. At the same time, the bearing pressure of each set of height limit devices 300 can be reduced, thereby improving the safety performance of the device.

[0083] In one embodiment, please refer to Figures 1 to 4 ,as well as Figures 11 to 15 When the pipe string 900 is loaded on the truss body 110 , part of the structure of the pipe string 900 is inserted into the fixing seat 130 .

[0084] Specifically, a part of the structure of the pipe string 900 is inserted into the fixing seat 130 and is bound to the fixing seat 130 through the fixing member 410, which plays a role in fixing the pipe string 900, and can prevent the pipe string 900 from moving forward under the action of inertia, thereby improving driving safety. When the pipe string vehicle is in a state of transporting the pipe string 900, the truss body 110 leans against the vehicle body 100 in a nearly horizontal position. During the transportation process, when the pipe string vehicle encounters emergency braking, downhill driving or turning on a curve, the fixing member 410 as an axial limiting device applies an axial limiting effect to the pipe string 900, and the pipe string 900 will not move forward due to the action of inertia, thereby improving the driving safety of the pipe string vehicle.

[0085] In one embodiment, please refer to Figures 11 to 15 The fixing member 410 is tightly connected to the fixing seat 130 , a union 910 is provided at one end of the pipe string 900 , and the fixing member 410 is threadedly connected to the union 910 , thereby realizing a detachable connection between the fixing member 410 and the pipe string 900 .

[0086] Specifically, the pipe string 900 may be provided with a union 910, which is threadedly connected to the fixing member 410 through the threaded joint of the union 910, thereby realizing the binding of the pipe string 900 and the fixing seat 130, thereby achieving the purpose of fixing the pipe string 900. During transportation, when the pipe string vehicle encounters emergency braking, downhill driving or turning on a curve, the fixing member 410 as an axial limiting device applies an axial limiting effect to the pipe string 900, and the pipe string 900 will not move forward due to inertia, thereby improving the driving safety of the pipe string vehicle.

[0087] In one embodiment, please refer to Fig.11 , Figures 13 to 15 The fixing member 410 is a flange 420, which includes a disk body 421 and a boss 422 arranged on one side of the disk body 421. One end of the union 910 penetrates into the fixing seat 130 from one side of the fixing seat 130, and the boss 422 penetrates into the fixing seat 130 from the other side opposite to the fixing seat 130 and is threadedly connected to the union 910. The disk body 421 is located outside the fixing seat 130 and is tightly connected to the fixing seat 130.

[0088] Specifically, the fixing member 410 as the axial limiting device can be connected to the union 910 by the flange 420 to fix the pipe string 900. The flange 420 includes a disc body 421 and a boss 422, wherein the boss 422 can be a hollow cylinder with a pipe thread on the outer surface, the boss 422 is threadedly connected to one end of the union 910, the pipe string 900 is connected to the other end of the union 910, and part of the structure at the end of the pipe string 900 can be embedded in the boss 422. In addition, the boss 422, the union 910 and the pipe string 900 are all inserted into the fixing seat 130, and the disc body 421 is located outside the fixing seat 130 and is tightly connected to the fixing seat 130. In this way, the pipe string 900 and the axial limiting device can be more stable.

[0089] In a specific embodiment, the disc 421 is located behind the fixing seat 130 along the driving direction of the pipe string vehicle, and is fastened to the fixing seat 130, wherein the fastening connection can be connected by bolts, screws and other fasteners having a fastening effect. In addition, during the transportation of the pipe string vehicle, when the pipe string vehicle is in emergency braking, driving downhill or turning on a curve, the pipe string 900 will move forward in the driving direction due to inertia. Therefore, the disc 421 will directly abut against the fixing seat 130, and the force between the two will not be transmitted to the fastener, which can prevent the fastener from being damaged and improve the driving safety of the pipe string vehicle.

[0090] In one embodiment, please refer to Fig.11The fixing member 410 may be a locking pin cylinder 430, which includes a locking pin cylinder barrel 431, a locking pin piston rod 432 disposed in the locking pin cylinder barrel 431, and a locking pin shaft 433 disposed on the locking pin piston rod 432. A plug-in groove is radially provided in the pipe string 900. When the locking pin piston rod 432 extends axially along the locking pin cylinder barrel 431, the locking pin shaft 433 is plugged into and matched with the plug-in groove.

[0091] Specifically, the pipe string 900 and the fixing seat 130 can be bound together by plugging the locking pin cylinder 430 with the pipe string 900, so as to enrich the types of fixing parts used as axial limiting devices. According to actual needs, the locking pin cylinder 430 and the fixing seat 130 can be detachably connected or fixedly connected. Thus, the locking pin shaft 433 is inserted into the plug-in slot under the action of the piston to prevent the pipe string 900 from axial movement.

[0092] It should be noted that when the fixing member 410 is the locking pin cylinder 430 , the pipe string 900 may not include the union 910 .

[0093] In a specific embodiment, please refer to Fig.11 According to the actual situation, the locking pin cylinder 430 and the flange 420 can also be provided at the same time to serve as the fixing member 410 respectively, so as to ensure that the pipe string 900 does not move and improve the driving safety.

[0094] In a specific embodiment, please refer to Fig.11 The plug-in slot may be located at the shaft neck of the pipe string 900 , that is, the locking pin cylinder 430 may be inserted at the shaft neck of the pipe string 900 for limiting.

[0095] In one embodiment, please refer to Fig.12 The locking pin cylinder 430 also includes a ball head rod 434 and a connecting seat 437. The ball head rod 434 includes a connecting rod 435 and a ball head 436 arranged at one end of the connecting rod 435. The connecting seat 437 has a ball groove, and the ball head 436 is rotatably arranged in the ball groove. One of the connecting rod 435 and the connecting seat 437 is connected to the locking pin piston rod 432, and the other is connected to the locking pin shaft 433, and the axis of the ball head rod 434 extends along the telescopic direction of the locking pin piston rod 432.

[0096] Specifically, the ball head 436 is rotatably arranged in the ball groove, so that the lock pin shaft 433 and the lock pin piston rod 432 connected to the ball head rod 434 and the ball groove can rotate relative to each other by a certain angle, and the lock pin oil cylinder 430 is arranged on the fixed seat 130. Therefore, when the pipe string vehicle is in emergency braking, driving downhill or turning on a curve, and the pipe string 900 has a tendency to move axially under the action of inertia, the pipe string 900 will apply a force along the radial direction of the lock pin shaft 433 to the lock pin shaft 433, and the lock pin shaft 433 can transfer the force to the fixed seat 130 by rotating relative to the lock pin piston rod 432, so that the force on the lock pin piston rod 432 of the lock pin oil cylinder 430 is greatly reduced, thereby improving the safety performance of the lock pin oil cylinder 430, making the force transmission smoother, and improving the limiting effect on the pipe string 900.

[0097] In addition, one of the connecting rod 435 and the connecting seat 437 is connected to the locking pin piston rod 432, and the other is connected to the locking pin shaft 433, which means that the locking pin piston rod 432 can be connected to the connecting rod 435, and the locking pin shaft 433 is connected to the connecting seat 437, or the locking pin piston rod 432 can be connected to the connecting seat 437, and the locking pin shaft 433 is connected to the connecting rod 435.

[0098] It should be noted that the axis of the ball head rod 434 extends along the telescopic direction of the locking pin piston rod 432, which means that the axis of the ball head rod 434 and the axis of the locking pin piston rod 432 can be parallel or have a certain small angle, but the directions of the two are consistent.

[0099] In one embodiment, please refer to Fig.12 The axis of the lock pin shaft 433 extends along the telescopic direction of the lock pin piston rod 432.

[0100] It should be noted that, that is to say, the axis of the locking pin shaft 433 and the axis of the ball head rod 434 are both along the extension and retraction direction of the locking pin piston rod 432. The axis of the locking pin shaft 433 and the locking pin piston rod 432 can be set in parallel or not. What is meant here is that the extension direction is consistent, which can make the force transmission smoother.

[0101] In one embodiment, please refer to Fig.12 The axial limiting device also includes a sleeve assembly 440 having an installation channel 441. The sleeve assembly 440 is arranged on the fixed seat 130. One end of the locking pin cylinder 431 close to the locking pin shaft 433 is connected to the sleeve assembly 440. Part of the structure of the locking pin shaft 433 is inserted into the installation channel 441.

[0102] Specifically, when the lock pin shaft 433 is deflected under the action of the pipe string 900 , the force can be transmitted to the sleeve assembly 440 , and then to the fixing seat 130 , thereby protecting the lock pin cylinder 430 and the fixing seat 130 .

[0103] In one embodiment, please refer to Figures 1 to 4 , Fig.11 , Fig.12 and Fig.16 The pipe string vehicle includes a radial limit assembly 500; the radial limit assembly 500 includes a first limit piece 510 and a second limit piece 520, the guide rail 120 is connected to the truss body 110, the fixed seat 130 is slidably connected to the guide rail 120, the first limit piece 510 is clamped between the guide rail 120 and the truss body 110, the second limit piece 520 is arranged on the fixed seat 130 and is located on the side of the fixed seat 130 away from the guide rail 120, when the truss body 110 is loaded with a pipe string 900, part of the structure of the pipe string 900 is penetrated in the fixed seat 130, and the first limit piece 510 cooperates with the second limit piece 520 to limit the radial movement of the pipe string 900.

[0104] Specifically, the first stopper 510 is sandwiched between the guide rail 120 and the truss body 110, the fixed seat 130 is slidably connected to the guide rail 120, and the second stopper 520 is arranged on the fixed seat 130 and is located on the side of the fixed seat 130 away from the guide rail 120. In other words, the first stopper 510 is arranged on the side of the fixed seat 130 close to the guide rail 120, and the second stopper 520 is arranged on the side of the fixed seat 130 away from the guide rail 120. Part of the structure of the pipe string 900 is penetrated in the fixed seat 130, and the first stopper 510 and the second stopper 520 cooperate to limit the radial movement of the pipe string 900. In other words, the second stopper 520 arranged on one side of the fixed seat 130 limits the upward movement of the pipe string 900, and the second stopper 520 arranged on the other side of the fixed seat 130 limits the downward movement of the guide rail 120, thereby limiting the downward movement of the fixed seat 130 and the pipe string 900. Therefore, when the road surface is uneven and causes the pipe string vehicle to vibrate up and down, the pipe string 900 can be prevented from moving radially during transportation, thereby avoiding damage to the various structures of the pipe string vehicle and improving the driving safety of the pipe string vehicle.

[0105] In one embodiment, please refer to Fig.16 The pipe string vehicle further includes a shift rod 530 detachably disposed on the fixing seat 130 , and the second position limiting member 520 is connected to the shift rod 530 .

[0106] Specifically, the second stopper 520 may be connected to the shift lever 530, and may be detachably arranged on the fixing seat 130 through the shift lever 530, so that the second stopper 520 may be detachably arranged on the fixing seat 130. That is to say, when the pipe string 900 is inserted into the fixing seat 130, the shift lever 530 connected with the second stopper 520 and the fixing seat 130 may be removed first, and after the pipe string 900 and the fixing seat 130 are assembled, the second stopper 520 and the shift lever 530 may be installed on the fixing seat 130. In this way, it is possible to avoid the pipe string 900 being heavy and being prone to directly hit the second stopper 520 arranged on the fixing seat 130 under the action of inertia when the pipe string 900 and the fixing seat 130 are assembled, thereby causing damage to various components, and at the same time, the installation is safer and more convenient, and the installation difficulty is reduced.

[0107] In addition, the detachable setting method can be a threaded connection, a snap connection, a fastened connection, a hinge connection, or other methods that can achieve a detachable setting of the gear lever 530 on the fixing seat 130.

[0108] In one embodiment, please refer to Fig.16 , the fixing seat 130 is fastened to the lever 530. Specifically, the fastening connection refers to fastening the fixing seat 130 and the lever 530 by bolts, screws and other fasteners having a fastening effect, so that the structure is stable and the installation is more convenient.

[0109] In one embodiment, please refer to Fig.16 The fixing seat 130 has two first plug-in grooves 130a arranged at intervals along the transverse direction. The gear lever 530 is a curved pipe 540, for example, it can be a U-shaped curved pipe. The opposite ends of the curved pipe 540 are respectively inserted into the corresponding first plug-in grooves 130a and are fastened to the side walls of the first plug-in grooves 130a.

[0110] Specifically, the two ends of the elbow 540 are plugged into the two plug-in slots in a one-to-one correspondence and then fastened by fasteners. Thus, the position of the second stopper 520 provided on the elbow 540 along the axial direction of the pipe string 900 can be adjusted by fastening the elbow 540 at different positions of the plug-in slots according to actual needs. In addition, the side wall of the first plug-in slot 130a refers to each wall surface forming the first plug-in slot 130a.

[0111] In a specific embodiment, according to actual needs, the number of the first plugging slots 130a can also be one or more.

[0112] In a specific embodiment, the extension direction of the first plugging slot 130 a may also be parallel to the radial direction of the tube string 900 , so that the radial relative position between the second limiting member 520 and the tube string 900 can be adjusted.

[0113] In one embodiment, please refer to Fig.11 The radial limiting assembly 500 includes a plurality of first limiting members 510 , and the plurality of first limiting members 510 are arranged at intervals along the axial direction of the guide rail 120 , thereby better stabilizing the guide rail 120 .

[0114] In one embodiment, please refer to Figures 1 to 4 , Fig.17 as well as Fig.18 The pipe string vehicle includes a mounting seat 610, two sets of connection components 620 and two guide rails 120. The two guide rails 120 are arranged at intervals along the lateral direction of the truss body 110 and extend along the length direction of the truss body 110. The mounting seat 610 is arranged on the truss body 110, and the mounting seats 610 are respectively arranged at the opposite ends of each guide rail 120 along the extension direction. In other words, each guide rail 120 is provided with at least one mounting seat 610 at both ends to stabilize the guide rail 120. In addition, mounting seats 610 can also be added to other positions of each guide rail 120 to improve the stability of the guide rail 120. The mounting seat 610 on at least one guide rail 120 can adjust the lateral position relative to the truss body 110 to adjust the lateral spacing between the two guide rails 120, and the mounting seat 610 on at least one guide rail 120 can adjust the vertical position relative to the truss body 110 to adjust the vertical spacing between the two guide rails 120. That is to say, the lateral and vertical spacing between the two guide rails 120 can be adjusted by adjusting the lateral position and vertical position of the mounting seat 610 relative to the truss body 110, respectively, and can be achieved by adjusting the lateral position and vertical position of the mounting seat 610 on one guide rail 120, or by adjusting the lateral position and vertical position of the mounting seat 610 on both guide rails 120 at the same time, or by adjusting the lateral position of the mounting seat 610 on one guide rail 120 and the vertical position of the mounting seat 610 on the other guide rail 120. The two sets of connecting components 620 are slidably connected to the two guide rails 120 in a one-to-one correspondence, and the fixing seat 130 is connected to the two sets of connecting components 620. In this arrangement, the position size between the two guide rails 120 can meet the installation requirements by adjusting the lateral and vertical spacing between the two guide rails, thereby reducing the installation difficulty of the guide rails 120 and making the installation more convenient.

[0115] It should be noted that the lateral and vertical positions of the mounting seat 610 along the truss body 110 are adjustable before and during installation. The relative positions of the two guide rails 120 can be adjusted by adjusting the installation position of the mounting seat 610 to meet the requirements of installation accuracy and improve installation convenience. After installation, the position of the mounting seat 610 cannot be moved to stabilize the guide rail 120.

[0116] In one embodiment, please refer to Fig.21 and Fig. 22The connecting assembly 620 includes a claw seat 621 and a slider 622 connected to the claw seat 621, the slider 622 is slidably connected to the guide rail 120, and the claw seat 621 is connected to the fixed seat 130. That is, by connecting the claw seat 621 to the fixed seat 130 and the slider 622 connected to the claw seat 621 to the guide rail 120, the fixed seat 130 can slide up and down along the guide rail 120. In one embodiment, please refer to Figure 21 to Figure 23 The slider 622 is a ring-shaped structure with an opening having an angle less than 180 degrees, and the slider 622 is sleeved on the guide rail 120 .

[0117] It should be noted that when the truss body 110 is in a vertical state, since the slider 622 is sleeved on the guide rail 120, the slider 622 can still slide up and down along the guide rail 120 and is not easy to derail. In addition, the opening of the slider 622 is less than 180 degrees, which is convenient for the installation of the slider 622 on the one hand, and is also conducive to reducing the requirements for installation accuracy on the other hand. During installation, the connecting assembly 620 can be sleeved on the guide rail 120 first, and then the guide rail 120 is connected to the mounting seat 610 and the truss body 110, and finally the fixing seat 130 is connected to the claw seat 621.

[0118] In one embodiment, please refer to Fig.18 and Fig.19 The guide rail mounting structure also includes a fastener 630. The mounting seat 610 has a first fastening hole 611, and the truss body 110 has a second fastening hole 110a. The fastener 630 passes through the first fastening hole 611 and the second fastening hole 110a to fasten the mounting seat 610 and the truss body 110. It should be noted that the fastener 630 can be a component that can achieve a fastening connection effect, such as a bolt, a stud, a screw, an assembly, a connection pair, etc. The first fastening hole 611 on the laterally adjustable mounting seat 610 is a waist-shaped hole extending in the transverse direction of the truss body 110, or the second fastening hole 110a corresponding to the laterally adjustable mounting seat 610 is a waist-shaped hole extending in the transverse direction of the truss body 110. That is to say, the fastening holes on the mounting seat 610 or the truss body 110 can be set as waist-shaped holes so that before the fastener 630 fastens the mounting seat 610 and the truss body 110, the mounting seat 610 can move laterally along the truss body 110 to adjust the lateral position, thereby adjusting the lateral spacing between the two guide rails 120 so that the lateral spacing between the two guide rails 120 meets the installation requirements.

[0119] In a specific embodiment, please refer to Fig.23 and Fig.24In order to facilitate installation, the fixing seat 130 may further include a track clamping plate 133, which is connected to the fixing seat body 132 of the fixing seat 130, and the claw seat 621 may be connected to the track clamping plate 133. Specifically, the guide rail mounting structure 11 includes four claw seats 621, and the four claw seats 621 are respectively connected to the four track clamping plates 133 in a one-to-one correspondence. It should be noted that the four claw seats 621 are respectively connected to a slider 622, so that the fixing seat 130 can slide up and down along the guide rail 120 more stably.

[0120] In a specific embodiment, please refer to Fig.19 and Fig. 20 A plurality of first fastening holes 611 may be provided on the mounting seat 610, and the corresponding truss body 110 may have the same number of second fastening holes 110a. A fastener 630 is passed between each first fastening hole 611 and the second fastening hole 110a to make the mounting seat 610 and the truss body 110 more stable.

[0121] In a specific embodiment, the vertical and horizontal position adjustment of the mounting seat 610 and the truss body 110 can be achieved by setting a gasket, or the vertical and horizontal position adjustment of the mounting seat 610 and the truss body 110 can also be achieved by setting a waist-shaped hole. In one embodiment, one of the mounting seat 610 with adjustable horizontal position and the truss body 110 has a slide rail, and the other of the mounting seat 610 with adjustable horizontal position and the truss body 110 has a slide groove, the slide groove extends along the horizontal direction of the truss body 110, and the slide rail and the slide groove slide in cooperation. In other words, the horizontal position adjustment of the mounting seat 610 relative to the truss body 110 can be achieved by setting a slide groove and a slide rail extending horizontally between the two. When the mounting seat 610 with adjustable horizontal position adjusts the horizontal spacing between the two guide rails 120 to the right position by sliding, the mounting seat 610 with adjustable horizontal position is welded to the truss body 110. When each component is installed, the mounting seat 610 can be slid horizontally to a suitable position to adjust the horizontal distance between the two guide rails 120 . The adjusted mounting seat 610 is then fixed by welding to the truss body 110 to stabilize the guide rail 120 and the fixing seat 130 .

[0122] In one embodiment, one of the vertically adjustable mounting seat 610 and the truss body 110 has a slide rail, and the other of the vertically adjustable mounting seat 610 and the truss body 110 has a slide groove, which extends vertically along the truss body 110, and the slide rail and the slide groove slide in cooperation. In other words, the vertical position adjustment of the mounting seat 610 relative to the truss body 110 can be achieved by providing a vertically extending slide groove and a slide rail between the two. When the vertically adjustable mounting seat 610 adjusts the vertical spacing between the two guide rails 120 to the desired position by sliding, the vertically adjustable mounting seat 610 is welded to the truss body 110. The vertical spacing requirement between the two guide rails 120 is met by vertical sliding during installation, and the purpose of stabilizing the slide rail and the fixing seat 130 is achieved by welding after installation.

[0123] In one embodiment, if Figures 1 to 7 As shown, the pipe string vehicle includes a working platform 140 and a hoisting mechanism 200. The hoisting mechanism 200 includes a hoist 210 and a wire rope wound on the hoist 210. The hoist 210 is arranged on a fixed seat 130. The hoist 210 can also be arranged inside the fixed seat 130. The working platform 140 has a storage state stored on the fixed seat 130 and a working state suspended below the fixed seat 130. The wire rope is retracted and released to drive the working platform 140 to switch between the storage state and the working state.

[0124] Thus, the pipe string vehicle is in the installation state and the working platform 140 is in the working state, that is, the working platform 140 is suspended under the fixed seat 130 by lowering the wire rope to facilitate operation; the pipe string vehicle is in the transportation state and the working platform 140 is in the storage state, that is, the working platform 140 is stored on the fixed seat 130 by reeling in the wire rope, so as to avoid the tail of the pipe string vehicle protruding too long due to the setting of the working platform 140 in the transportation state, thereby affecting driving safety.

[0125] In one embodiment, if Figures 1 to 7As shown, the hoisting mechanism 200 includes a first guide wheel 230 and a first hanging part, the first hanging part includes a first hanging member and a second hanging member, the first guide wheel 230 is arranged on the working platform 140, the first hanging member is arranged on the fixed seat 130, the second hanging member is connected to one end of the wire rope, the end of the wire rope connected to the second hanging member passes around the first guide wheel 230, and the second hanging member is hung with the first hanging member, that is, the wire rope and the fixed seat 130 can be hung through the first hanging part, the first guide wheel 230 is arranged on the working platform 140, the end of the wire rope connected to the second hanging member passes around the first guide wheel 230, the first guide wheel 230 plays a guiding role to guide the wire rope, the first guide wheel 230 is a movable pulley, and the wire rope is hung with the fixed seat 130 after passing under the first guide wheel 230. When the winch 210 rotates to hoist the wire rope, the wire rope drags the first guide wheel 230 by retracting and releasing, thereby enabling the working platform 140 to rise to the storage state to enhance driving safety, or to descend to the working state to facilitate the work of the operator. In addition, the design of the movable pulley reduces the tension on the wire rope by half, ensuring safety.

[0126] In a specific embodiment, the second hanging member can be a hook, and the first hanging member can be a hook, a hanging ring, a hanging rod or other objects that can cooperate with the hook of the second hanging member to realize the hanging of the wire rope and the fixed seat 130. The first guide wheel 230 can be set at the bottom of the working platform 140, or the first guide wheel 230 can be set at the top of the working platform 140.

[0127] In one embodiment, please refer to Figure 5 The working platform retractable structure 12 also includes a second guide wheel 220, which is arranged on the fixed seat 130. The second guide wheel 125 is a fixed pulley. The wire rope passes around the second guide wheel 220. The second guide wheel 220 guides and promotes the retraction of the wire rope.

[0128] In one embodiment, the working platform retractable structure 12 also includes a second hanging part, that is, the working platform retractable structure 12 can also include only the second hanging part, without the need to set a guide wheel, the second hanging part includes a third hanging member and a fourth hanging member, the third hanging member is arranged on the top of the working platform 140, the fourth hanging member is connected to one end of the wire rope, and the fourth hanging member is hung with the third hanging member, so that the wire rope is directly hung with the working platform 140, and the wire rope is hoisted by the winch 210, so that the wire rope drives the working platform 140 to rise or fall through the retraction and extension, which can greatly shorten the use length of the wire rope under the condition that the wire rope meets the safety requirements.

[0129] In one embodiment, please refer to Figures 1 to 7The working platform 140 is a working basket, that is, the working platform 140 can be a basket-shaped structure, which can make the operator safer during operation. When the working platform 140 is in the storage state, at least part of the structure of the fixing seat 130 is located in the working basket, that is, in the storage state, the working basket can wrap at least part of the structure of the fixing seat 130, which can further enhance driving safety.

[0130] In one embodiment, please refer to Figures 1 to 4 ,as well as Figure 25 to Figure 27 As shown, the pipe string vehicle includes a pipe string claw 700 ; the pipe string claw 700 is disposed on the truss body 110 to fix the truss body 110 and the pipe string 900 .

[0131] Specifically, the pipe string vehicle is mainly used to transport the pipe string 900. During the transportation process, the pipe string 900 is fixed on the truss body 110 by the pipe string claw 700. When it arrives at the work site, when working at the wellhead, the truss body 11 is rotated around the vehicle body 100 to a vertical state, the pipe string claw 700 is released, the pipe string 900 is lowered, and then various working tools and continuous pipes are installed.

[0132] See also Figure 25 to Figure 27 The pipe string clamp 700 includes: a base 71, two claw poles 72 and a clamp cylinder 73; one end of each claw pole 72 has a first leg 721 and a second leg 722, and the first leg 721 is hinged to the base 71 at a first hinge point 723; the two claw poles 72 are arranged opposite to each other and can be in an open state or a clamped state relative to the base 71; the two ends of the clamp cylinder 73 are respectively hinged to the second legs 722 of the two claw poles 72 at a second hinge point 724; the clamp cylinder 73 can drive the two claw poles 72 to switch between the open state and the clamped state; in one claw pole 72, the line connecting the first hinge point 723 and the second hinge point 724 has an angle G with the axial direction of the clamp cylinder 73; in the process of switching the two claw poles 72 from the clamped state to the open state, the angle G gradually increases.

[0133] One end of each claw pole 72 has a first leg 721 and a second leg 722, and the first leg 721 is hinged to the base 71 at a first hinge point 723, that is, the claw pole 72 can rotate around the first hinge point 723, and the two claw poles 72 are arranged opposite to each other. When the ends of the two claw poles 72 away from the first hinge point 723 are rotated to be close to each other, they can be in a clamped state relative to the base 71. At this time, the pipe string 900 can be effectively limited in the circumferential direction to prevent it from moving around; when the ends of the two claw poles 72 away from the first hinge point 723 are rotated to be away from each other, they can be in an open state relative to the base 71, the claw pole 72 no longer limits the pipe string 900, and the pipe string 900 can be separated from the truss body 110.

[0134] The two ends of the claw cylinder 73 along the axial direction are respectively hinged to the second legs 722 of the two claw poles 72 at the second hinge point 724, and the axial direction here refers to the direction of the axis of the claw cylinder body 31 of the claw cylinder 73; the claw cylinder 73 can drive the two claw poles 72 to switch between the open state and the clamped state; that is, by controlling the overall length of the claw cylinder 73, the length between the second hinge points 724 of the second legs 722 of the two claw poles 72 is changed. Since the first leg 721 is hinged to the base 71 at the first hinge point 723, the length between the first hinge points 723 of the first legs 721 of the two claw poles 72 is fixed, thereby realizing the rotation of the claw poles 72 relative to the base 71 around the first hinge point 723.

[0135] In one claw pole 72 , a line connecting the first hinge point 723 and the second hinge point 724 forms an angle G with the axis direction of the claw cylinder 73 ; during the process of the two claw poles 72 switching from the clamping state to the opening state, the angle G gradually increases.

[0136] See also Figures 1 to 4 , Fig.25 and Fig. 27 As shown, when the overall length of the claw cylinder 73 becomes shorter, the length between the second hinge points 724 of the second legs 722 of the two claw poles 72 becomes shorter, and the second leg 722 of the left claw pole 72 drives the whole to rotate counterclockwise around the first hinge point 723 of the first leg 721, and the second leg 722 of the right claw pole 72 drives the whole to rotate clockwise around the first hinge point 723 of the first leg 721; the line connecting the first hinge point 723 and the second hinge point 724 of each claw pole 72 has an angle G with the axial direction of the claw cylinder 73; the two claw poles 72 switch from the clamping state to the open state, and the angle G gradually increases, the claw pole 72 no longer limits the pipe string 900, and the pipe string 900 can be separated relative to the truss body 110.

[0137] On the contrary, when the overall length of the claw cylinder 73 becomes longer, the length between the second hinge points 724 of the second legs 722 of the two claw poles 72 becomes longer, the second leg 722 of the left claw pole 72 drives the whole to rotate clockwise around the first hinge point 723 of the first leg 721, and the second leg 722 of the right claw pole 72 drives the whole to rotate counterclockwise around the first hinge point 723 of the first leg 721. The line connecting the first hinge point 723 and the second hinge point 724 of each claw pole 72 has an angle G with the axial direction of the claw cylinder 73; the two claw poles 72 switch from the open state to the clamped state, and the angle G gradually decreases. The claw poles 72 effectively limit the circumferential position of the pipe string 900 to prevent it from moving around.

[0138] It should be understood that the angle G of one claw pole 72 here refers to the angle formed by the line connecting the first hinge point 723 and the second hinge point 724 and the axis of the claw cylinder 73, and the angle at which the opening is aligned with the other claw pole 72. The angle can be an acute angle or an obtuse angle.

[0139] In the related art, one claw pole is controlled by one claw cylinder to open and close, and two claw poles require two claw cylinders to cooperate. However, if the two claw poles are not synchronized, after one claw pole is in place to clamp the pipe string, the other claw pole may not be in place yet, resulting in the pipe string being loosely fixed in the circumferential direction, which poses a safety hazard. In the related art, one pipe string clamp requires two claw cylinders to control it, and each claw cylinder requires a corresponding control valve and is connected to a long hydraulic pipeline, making the hydraulic system of the pipe string vehicle complex and costly.

[0140] In the embodiment of the present application, a claw cylinder 73 is used to control the length between the second hinge points 724 of the second legs 722 of the two claw poles 72, so that the two claw poles 72 can move synchronously. When one claw pole 72 holds the pipe string 900 in place, the claw cylinder 73 drives the other claw pole 72 to hold tightly. This avoids the use of two claw cylinders to move, achieves synchronization of the claw poles 72, and saves half of the corresponding control valves and hydraulic pipelines, thereby reducing costs, making the hydraulic system simpler and more reliable, and achieving good economic benefits.

[0141] In one embodiment, please refer to Figure 25 to Figure 27 The claw cylinder 73 includes a claw cylinder body 731 and a claw piston rod 732 , wherein the second leg 722 of one claw pole 72 is hinged to the claw cylinder body 731 , and the second leg 722 of the other claw pole 72 is hinged to the claw piston rod 732 .

[0142] Specifically, the second leg 722 of one claw pole 72 is hinged to one end of the claw cylinder 731 away from the claw piston rod 732 , and the second leg 722 of the other claw pole 72 is hinged to one end of the claw piston rod 732 away from the claw cylinder 731 . The claw cylinder 731 is provided with an oil inlet and an oil outlet; when oil enters the claw cylinder 731, the claw piston rod 732 extends relative to the claw cylinder 731, the overall length of the claw cylinder 73 becomes longer, and the length between the second hinge points 724 of the second legs 722 of the two claw poles 72 becomes longer, the second leg 722 of the left claw pole 72 drives the whole to rotate clockwise around the first hinge point 723 of the first leg 721, and the second leg 722 of the right claw pole 72 drives the whole to rotate counterclockwise around the first hinge point 723 of the first leg 721, the two claw poles 72 switch from an open state to a clamped state, the angle G gradually decreases, and the claw pole 72 effectively limits the circumferential position of the pipe string 900 to prevent it from moving around. When oil is discharged from the claw cylinder 731, the claw piston rod 732 retracts relative to the claw cylinder 731, and the length between the second hinge points 724 of the second legs 722 of the two claw poles 72 becomes shorter. The second leg 722 of the left claw pole 72 drives the whole body to rotate counterclockwise around the first hinge point 723 of the first leg 721, and the second leg 722 of the right claw pole 72 drives the whole body to rotate clockwise around the first hinge point 723 of the first leg 721; the two claw poles 72 switch from the clamping state to the open state, and the angle G gradually increases. The claw pole 72 no longer limits the pipe string 900, and the pipe string 900 can be separated relative to the truss body 110.

[0143] In one embodiment, please refer to Figure 25 to Figure 27 The end of the body 725 close to the first leg 721 is formed with a positioning notch 7251, which can be a right-angled notch to facilitate the application of rotational torque. The second leg 722 is a triangular plate, and one of the corners of the second leg 722 is matched with the positioning notch 7251, that is, the angle can also be a right angle accordingly. The shapes of the two are matched, so that the peripheral side of the second leg 722 can fit on the side wall of the positioning notch 7251. The other corner of the second leg 722 away from the first leg 721 is formed with a second hinge point 724.

[0144] In one embodiment, please refer to Figure 25 to Figure 27 The end of the body 725 away from the first leg 721 is formed with a positioning portion 726, and the positioning portions 726 of the two claw poles 72 are adapted to each other to achieve fixation. The two claw poles 72 are in a clamped state, and are further locked by the positioning portion 726 to prevent the claw cylinder 73 from leaking oil, resulting in a change in the loose state. The positioning portion 726 can be two buckles or two misaligned plates with bolt holes formed on the plates. After the two are aligned, the pin is inserted, thereby effectively limiting the circumferential position of the pipe string 900.

[0145] In one embodiment, please refer to Figure 25 to Figure 27 The pipe string claw includes an adjustment pad 727, which is arranged on the side of the body 725 of the two claw poles 72. The shape of the adjustment pad 727 can also be generally rhombus or semi-circular. The outer side of the adjustment pad 727 is close to the side of the body 725 to increase the force area. The inner side of the adjustment pad 727 is directly in contact with the peripheral side of the pipe string 900, so its inner side is generally a cylindrical surface to make the force uniform. The adjustment pad 727 is generally a high-strength alloy such as steel alloy to adapt to harsh working environments. The adjustment pad 727 can be connected to the body 725 by bolts, which is convenient for maintenance and replacement. Different adjustment pads 727 can be selected according to different pipe bundles, which is more flexible to use. The inner side of the adjustment pad 727 can be added with a shock-resistant buffer rubber pad as needed, and an anti-slip protrusion or a friction layer can be provided to avoid wear of the pipe string 900 during transportation.

[0146] In one embodiment, please refer to Figure 25 to Figure 27 As shown, the pipe string claw includes a limit stopper 74 fixed on the base 71, and the two can be connected by bolts or welding. When the two claw poles 72 are in an open state, the top of the limit stopper 74 contacts the other side of the body 725 of the two claw poles 72, thereby preventing them from opening infinitely and preventing the claw cylinder 73 from being damaged. The range of the angle G can be set to 15° to 145° as required. The top surface of the limit stopper 74 can be an arc surface to adapt to the arc of the other side of the body 725 of the claw pole 72, so that the force-bearing area of ​​the two is larger.

[0147] In one embodiment, if Figure 25 to Figure 27 As shown, during the process of the two claw poles 72 switching from the clamped state to the open state, the claw cylinder 73 moves away from the line connecting the first hinge points 723 of the two claw poles 72, that is, the claw cylinder 73 is not fixed relative to the base 71, and during the process of the pipe string claw switching from the clamped state to the open state, the normal direction of the axis of the claw cylinder 73 moves away from the line connecting the first hinge points 723 of the two claw poles 72.

[0148] The present application further provides a pipe string construction method for an oilfield wellhead, comprising:

[0149] S10, pre-assemble the pipe string 900. The pipe string 900 is a pipe assembly with a certain axial length, and the corresponding components are pre-assembled before leaving the factory, such as the blowout preventer 920, the blowout preventer box 930 with dynamic seal, and the blowout preventer 940 with static seal, etc. Since the blowout preventer 920, the blowout preventer box 930 with dynamic seal, and the blowout preventer 940 with static seal are pre-assembled in the factory, the space is less restricted and the construction is convenient.

[0150] S20, placing the pipe string on the truss body of the pipe string vehicle. The pipe string 900 is placed on the truss body 110 by a crane, and the pipe string 900 is limited by the fixing seat 130, the pipe string claw 700, the height limiting device 300, the fixing member 410 as the axial limiting device, and the radial limiting assembly 500.

[0151] S30, the pipe string vehicle is in the installation state, and the truss body 110 is erected on the vehicle body 100 to make the pipe string 900 stand upright. First, the first leg 170 and the second leg 180 are unfolded and the vehicle body 100 is supported until the tires are off the ground, and then the truss body 110 is driven by the luffing cylinder 160 to be vertical to the ground, ready to install the working tool.

[0152] S40, installing the injection head at the upper end of the pipe string. Use a crane to install the injection head at the upper end of the pipe string 900 to facilitate subsequent connection and assembly.

[0153] S50, hoisting the pipe string 900. The pipe string 900 is hoisted by a crane, and the hoisting position may be the upper end of the pipe string 900.

[0154] S60, loosen the fixing of the truss body 110 and the pipe string 900, adjust the height of the pipe string 900 from the ground to form an installation space M, and the fixing seat 130 rises or falls along the vertical direction with the pipe string 900. Since the truss body 110 and the pipe string 900 are fixed in the transportation state, the fixing of the truss body 110 and the pipe string 900 should be released first, for example, the pipe string claw 700 is loosened, so as to facilitate the adjustment of the height of the pipe string 900 by the crane.

[0155] S70 , installing the working tool on the pipe string 900 in the installation space M. The height of the pipe string 900 from the ground can facilitate the installation of the working tool at the wellhead on the pipe string 900 , for example, installing it in the blowout preventer 920 .

[0156] S80, release the fixing of the pipe string 900 and the fixing member 410, and transport the pipe string 900 to the wellhead of the oil field. That is, release the position limit of the pipe string 900 by the fixing seat 130, and then the pipe string 900 is basically separated from the pipe string vehicle, and the crane bears the entire weight of the pipe string 900, and the pipe string 900 equipped with the injection head is lifted to the wellhead by the crane to complete the corresponding installation.

[0157] Between steps S20 and S30, step S21 may also be included:

[0158] S21, the pipe string vehicle is in a transport state, the truss body 110 is placed horizontally on the vehicle body 100, and the pipe string 900 is transported to the wellhead of the oil field.

[0159] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0160] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipe string vehicle, used for transporting and installing pipe strings, characterized in that: include: Vehicle body; a truss body, the truss body being rotatably disposed on the vehicle body and being used for fixing the pipe string; A guide rail connected to the truss body; A fixing seat, which is slidably connected to the guide rail and is located at the rear end of the truss body along the travel direction; a fixing member, which is arranged on the fixing seat and is used to be detachably connected to the pipe string to fix the pipe string; the pipe string vehicle has a transport state and an installation state, in which the truss body is placed horizontally on the vehicle body; in the installation state, the truss body is erected, and when the fixation between the truss body and the pipe string is released, the fixing seat can slide up and down along the extension direction of the truss body; A height limiting device is arranged on the truss body, and the height limiting device comprises: a pull rod, a spring oil cylinder and a plurality of rotating seats; the piston rod of the spring oil cylinder is connected to the pull rod; A plurality of rotating seats are arranged at intervals along the height direction of the truss body, and each of the rotating seats is hinged to the pull rod respectively to form a rotation center of each rotating seat; the height limiting device is configured as follows: when the fixed seat rises along the truss body, the fixed seat pushes the rotating seat to rotate around the rotation center, the rotating seat drives the pull rod to move downward, and the piston rod of the spring cylinder retracts; when the fixed seat rises along the truss body to a first position that separates the fixed seat from the rotating seat, the piston rod of the spring cylinder extends outward under the action of elastic force and drives the pull rod to move upward, and the pull rod drives the rotating seat to reset, so that the rotating seat remains in a limited state in which it can abut against the fixed seat; when the rotating seat is in the limited state, when the piston rod of the spring cylinder retracts under the action of hydraulic oil, the piston rod of the spring cylinder drives the pull rod to move downward, and the pull rod drives the rotating seat to rotate, so that the rotating seat switches from the limited state to an avoidance state that avoids the fixed seat.

2. The pipe string vehicle according to claim 1, characterized in that: The end of the pipe string is provided with a union, and the fixing piece is threadedly connected to the union; The fixing member is a flange, which includes a disk body and a boss arranged on one side of the disk body. The pipe string is provided with an end of the union that penetrates into the fixing seat from one side of the fixing seat, and the boss penetrates into the fixing seat from the other side opposite to the fixing seat and is threadedly connected to the union. The disk body is located outside the fixing seat and is tightly connected to the fixing seat.

3. The pipe string vehicle according to claim 1, characterized in that: The fixing part is a locking pin cylinder, which includes a locking pin cylinder barrel, a locking pin piston rod arranged in the locking pin cylinder barrel, and a locking pin shaft arranged on the locking pin piston rod. A plug-in groove is radially arranged on the pipe string. When the locking pin piston rod extends axially along the locking pin cylinder barrel, the locking pin shaft is plugged into and matched with the plug-in groove.

4. The pipe string vehicle according to claim 1, characterized in that: The pipe string vehicle includes a radial limiting assembly, which includes a first limiting member and a second limiting member. The first limiting member is clamped between the guide rail and the truss body, and the second limiting member is arranged on the fixing seat and is located on the side of the fixing seat away from the guide rail. When the pipe string is loaded on the truss body, part of the structure of the pipe string is passed through the fixing seat, and the first limiting member cooperates with the second limiting member to limit the radial movement of the pipe string.

5. The pipe string vehicle according to claim 1, characterized in that: The pipe string vehicle comprises a mounting seat, two sets of connection components and two guide rails; The two guide rails are arranged at intervals along the lateral direction of the truss body; The mounting seat is arranged on the truss body, and the mounting seats are respectively arranged at opposite ends of each guide rail along the extension direction, the mounting seat on at least one guide rail can adjust the lateral position relative to the truss body to adjust the lateral spacing between the two guide rails, and the mounting seat on at least one guide rail can adjust the vertical position relative to the truss body to adjust the vertical spacing between the two guide rails; The two sets of the connection components are slidably connected to the two guide rails in a one-to-one correspondence; The fixing seat is connected to two sets of the connecting components.

6. The pipe string vehicle according to claim 1, characterized in that: The pipe string vehicle comprises a working platform and a winch mechanism; The hoisting mechanism includes a hoist and a steel wire rope wound on the hoist, the hoist is arranged on the fixed seat, the working platform has a storage state stored on the fixed seat and a working state suspended below the fixed seat, and the steel wire rope is retracted and released to drive the working platform to switch between the storage state and the working state; The pipe string vehicle is in the transport state, the working platform is in the storage state, the pipe string vehicle is in the installation state, and the working platform is in the working state.

7. The pipe string vehicle according to claim 1, characterized in that: The pipe string vehicle comprises a pipe string claw arranged on the truss body, and the pipe string claw comprises: a base, two claw poles and a claw cylinder; One end of each claw pole has a first leg and a second leg, and the first leg is hinged to the base at a first hinge point; the two claw poles are arranged opposite to each other and can be in an open state or a clamped state relative to the base; The two ends of the clamping claw oil cylinder are respectively hinged to the second legs of the two claw poles at the second hinge point; the clamping claw oil cylinder can drive the two claw poles to switch between an open state and a clamped state.

8. A pipe string construction method for an oil field wellhead, characterized in that: include: Pre-assembled pipe strings; Fixing the pipe string to the truss body of the pipe string vehicle according to any one of claims 1 to 7; The pipe string vehicle is in an installation state, and the truss body is erected to make the pipe string stand upright; Install the injection head at the upper end of the pipe string; Hanging the pipe string; Loosen the fixation between the truss body and the pipe string, adjust the height of the pipe string from the ground to form an installation space, and the fixing seat rises or falls along the vertical direction with the pipe string; Installing a working tool on the pipe string in the installation space; The fixing of the pipe string and the fixing member is released, and the pipe string is transported to the wellhead of the oil field.

Images