Oil pipe large four-way joint for Christmas tree water injection wellhead and forming process of oil pipe large four-way joint

Abstract

The invention relates to the technical field of petroleum pipelines, in particular to an oil pipe large four-way joint for a Christmas tree water injection wellhead and a forming process of the oil pipe large four-way joint for the Christmas tree water injection wellhead. Opening flattening treatment is conducted, specifically, branch ports of the four-way pipe fitting are punched or extruded and trimmed; chamfering treatment is conducted, specifically, all branch ports of the four-way pipe fitting are chamfered; surface burrs are removed, specifically, the annealed four-way pipe fitting is placed on a surface remover to remove the surface burrs; internal burrs are polished, specifically, a surface remover is operated to remove the burrs in the four-way pipeline, and polishing treatment is conducted at the same time; the four-way pipe fitting is soaked in an anti-rust oil tank for 1-3 minutes; packaging, wherein the four-way pipe fitting is subjected to rust-proof packaging treatment; the four-way pipe fitting has the beneficial effect that the problem that the machined four-way pipe fitting cannot be directly applied to a Christmas tree water injection wellhead due to the fact that more burrs and frosted surfaces on the surface, the inner wall and the corners need to be treated is solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum pipelines, and more particularly to a large oil pipe cross-piece used for a water injection wellhead of an oil tree and a forming process thereof. Background Art

[0002] Christmas trees and water injection wellheads are key equipment in oil and gas field production. Tubing fittings are used to connect, control and adjust tubing strings to ensure safe transportation of fluids (crude oil, water, natural gas) in the well. In the process of using the fittings, key parts such as crosses and tees are needed for diversion and diversion. Therefore, the products need to be processed and prepared through unique processes; a large tubing cross for Christmas tree water injection wellhead and its forming process are similar to patent number CN202411124810.8, in which the forming process specifically includes the following steps: S1: heat treatment of rods, S2: heat treatment of rods, S3: heat treatment of rods, S4: heat treatment of rods, S5: heat treatment of rods, S6: heat treatment of rods, S7: heat treatment of rods, S8: heat treatment of rods, S9: heat treatment of rods, S10: heat treatment of rods, S11: heat treatment of rods, S12: heat treatment of rods, S13: heat treatment of rods, S14: heat treatment of rods, S15: heat treatment of rods, S16: heat treatment of rods, S17: heat treatment of rods, S18: heat treatment of rods, S29: heat treatment of rods, S30: heat treatment of rods, S41 2: automatic feeding, S3: mold closing, S4: front and rear stamping, S5: cooling and demoulding, S6: machining center processing; the invention effectively solves the problem of low processing efficiency after adopting the above process; the invention replaces traditional casting with stamping, which not only improves production efficiency, but also greatly reduces costs, can effectively prevent the generation of sand holes and air holes, and improves product quality; however, the surface, inner wall and corners of the four-way pipe fittings processed by this process still have a lot of burrs and frosted surfaces that need to be processed, and cannot be directly used in the water injection wellhead of the oil tree. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the processed four-way pipe fittings still have many burrs and frosted surfaces on the surface, inner wall and corners that need to be processed, and cannot be directly used in the Christmas tree water injection wellhead.

[0004] To this end, the technical solution adopted is that a large tubing spool for a water injection wellhead of an oil tree and a molding process thereof of the present invention comprises the following steps:

[0005] S1: Annealing: The annealed tube blank is punched and sleeved to preform the four-way pipe fitting;

[0006] S2: Flat end treatment: Punching or extrusion trimming of the branch ends of the four-way pipe fittings;

[0007] S3: Chamfering: Chamfer each branch port of the four-way pipe fitting;

[0008] S4: Remove surface burrs: Place the annealed four-way pipe fitting on a surface remover to remove surface burrs;

[0009] S5: Grinding internal burrs for polishing: operating the surface remover to remove the burrs inside the cross-way pipe and perform polishing at the same time;

[0010] S6: Oil immersion: Immerse the four-way pipe fitting into the anti-rust oil tank and soak for 1 - 3 minutes;

[0011] S7: Packaging: Conduct anti-rust packaging treatment on the four-way pipe fitting.

[0012] Preferably, the surface remover in step S5 includes a four-way pipe fitting, a base, a processing chassis, a pipe fitting clamp, a pipe fitting internal grinding and polishing device, and a surface deburring device. The four-way pipe fitting is placed on the pipe fitting clamp for clamping. The pipe fitting clamp is fixed on the processing chassis, and the processing chassis is rotatably arranged in the base; multiple pipe fitting internal grinding and polishing devices are connected to the processing chassis through anchor bolts to polish the inner wall of the four-way pipe fitting; a surface deburring device is connected to the processing chassis through anchor bolts, and the surface deburring device grinds and deburrs the surface and corners of the four-way pipe fitting.

[0013] Preferably, a protective ring is fixed at the upper end of the base and arranged around the processing chassis. The processing chassis includes a processing plate and a turntable driver. The processing plate is arranged within the protective ring and fixed on the transmission shaft of the turntable driver. The turntable driver is fixed in the base through a fixed seat.

[0014] Preferably, the pipe fitting clamp includes a pipe fitting arc-shaped support platform, a fixed bracket, a clamping top platform, a jacking cylinder, and a support disk. Multiple pipe fitting arc-shaped support platforms are provided. The multiple pipe fitting arc-shaped support platforms are respectively fixed within multiple fixed brackets. The multiple fixed brackets and the multiple jacking cylinders are all fixed on the support disk. The jacking cylinder drives the clamping top platform to slide within the fixed bracket. The support disk is fixed at the middle end of the processing plate of the processing chassis through a support rod.

[0015] Preferably, a plurality of threaded holes and circular chutes are evenly arranged on the processing plate; the pipe fitting internal grinding and polishing device includes a slide rail base, an arc-shaped slide rail, a propulsion cylinder, a propulsion seat, and a propulsion shaft support platform. The lower end of the slide rail base slides within the circular chute through the arc-shaped slide rail, and the slide rail base is fixed in the threaded hole through a bolt; a propulsion cylinder is fixed on the outer wall of the slide rail base, and the propulsion cylinder drives the propulsion seat to slide within the slide rail base in a limited manner. A propulsion shaft support platform is fixed on the propulsion seat.

[0016] Preferably, a motor drive seat is fixedly connected to the outside of the propulsion shaft support platform. The motor within the motor drive seat drives a grinding rotating shaft and an impurity blower through gear meshing. The grinding rotating shaft is rotatably connected within the propulsion shaft support platform, and an inner wall grinding device is fixed at the inner end of the grinding rotating shaft; the impeller within the impurity blower drives the motor transmission shaft within the motor drive seat through gear meshing transmission, and a flexible air duct is fixed at the inner end of the impurity blower.

[0017] Preferably, the inner wall grinding device includes a grinding addition seat and a plurality of grinding top rollers. The grinding addition seat is fixed on the grinding rotating shaft, and a plurality of grinding top rollers are evenly arranged within the grinding addition seat. The inner end of the grinding addition seat is in a conical shape.

[0018] Preferably, the grinding top roller includes a top table, a grinding roller and a top spring. A plurality of top springs are fixed between the inner wall of the top table and the grinding addition seat, and a grinding roller is rotatably arranged in the top table.

[0019] Preferably, the surface deburring device includes a fixed rail table and an addition cylinder. The fixed rail table and the addition cylinder are both fixed on the processing disk. The addition cylinder drives the slide rail bracket to slide limit on the fixed rail table. The upper end of the slide rail bracket is fixed with a longitudinal drive grinding hydraulic cylinder. The longitudinal drive grinding hydraulic cylinder drives the surface grinding driver and the surface grinding disk to slide limit longitudinally in the slide rail bracket; abrasive paper is arranged on the lower surface of the surface grinding disk; a plurality of ball groove seats are evenly fixed on the lower surface of the surface grinding disk. A spherical connecting rod is hinged in the ball groove seat through a sphere, and the lower end of the spherical connecting rod is connected with a conical grinding rod through a threaded fit. The conical grinding rod is inserted and ground at the corner of the four-way pipe fitting.

[0020] A four-way pipe for the oil production tree injection wellhead, applicable to the forming process of the four-way pipe for the oil production tree injection wellhead. Flange plates are arranged at multiple ports of the four-way pipe fitting prepared by the above forming process for connecting the injection water pipelines.

[0021] Other features and advantages of the present invention will be described in the following description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structure specifically pointed out in this application document.

[0022] The following will further describe the technical solutions of the present invention in detail through the drawings and embodiments. Description of the Drawings

[0023] The drawings are used to provide a further understanding of the present invention, and constitute a part of the description. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0024] Figure 1 is a process flow schematic diagram of the forming process of the present invention;

[0025] Figure 2 is a first-direction structural schematic diagram of the overall surface remover of the present invention;

[0026] Figure 3 is a second-direction structural schematic diagram of the overall surface remover of the present invention;

[0027] Figure 4 is a structural schematic diagram of the base of the present invention;

[0028] Figure 5 is a structural schematic diagram of the processing disk of the present invention;

[0029] Figure 6 is a schematic diagram of the structure of the pipe fitting clamp of the present invention Figure 1 ;

[0030] Figure 7 is a schematic diagram of the structure of the pipe fitting clamp of the present invention Figure 2 ;

[0031] Figure 8 is a schematic diagram of the structure of the internal grinding and polishing device for pipe fittings of the present invention Figure 1 ;

[0032] Figure 9 is a schematic diagram of the structure of the internal grinding and polishing device for pipe fittings of the present invention Figure 2 ;

[0033] Figure 10 is a schematic diagram of the structure of the internal grinding and polishing device for pipe fittings of the present invention Figure 3 ;

[0034] Figure 11 is a schematic diagram of the structure of the internal grinding and polishing device for pipe fittings of the present invention Figure 4 ;

[0035] Figure 12 is a schematic diagram of the structure of the internal wall grinding device for pipe fittings of the present invention Figure 1 ;

[0036] Figure 13 is a schematic diagram of the structure of the internal wall grinding device for pipe fittings of the present invention Figure 2 ;

[0037] Figure 14 is a schematic diagram of the structure of the grinding top roller of the present invention;

[0038] Figure 15 is a schematic diagram of the structure of the surface deburring device of the present invention;

[0039] Figure 16 is a schematic diagram of the structure of the surface grinding disc of the present invention.

[0040] In the figure: four-way pipe fitting 1; base 2; processing chassis 3; pipe fitting clamp 4; internal grinding and polishing device for pipe fitting 5; surface deburring device 6; protective ring 7; processing disk 8; turntable driver 9; arc-shaped pipe fitting support platform 11; fixed support 12; clamping top platform 13; jacking cylinder 14; support disk 15; slide rail base 16; arc-shaped slide rail 17; propulsion cylinder 18; propulsion seat 19; propulsion shaft support platform 20; grinding rotating shaft 21; motor drive seat 22; inner wall grinding device 23; impurity blower 24; grinding addition seat 25; grinding top roller 26; top platform 27; grinding rotating roller 28; jacking spring 29; fixed rail platform 30; addition cylinder 31; slide rail support 32; longitudinally driven grinding hydraulic cylinder 33; surface grinding driver 34; surface grinding disk 35; ball groove seat 36; spherical connecting rod 37; conical grinding rod 38. Detailed implementation manners

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "middle", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present application. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0043] In addition, unless otherwise clearly specified and limited, the terms "install", "connect", "connection", "fix" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is less than that of the second feature.

[0045] Embodiment 1:

[0046] As Figure 1 and Figure 2 shown, a tubing cross-over for the wellhead of an oil production tree injection well and its forming process include the following steps:

[0047] S1: Annealing: After annealing the tube blank, the cross-over fitting 1 is preformed through stamping and socket knocking;

[0048] S2: Flat mouth treatment: Punch or extrude and trim the branch ports of the cross-over fitting 1;

[0049] S3: Chamfering treatment: Chamfer each branch port of the cross-over fitting 1;

[0050] S4: Removing surface burrs: Place the annealed cross-over fitting 1 on a surface remover to remove surface burrs;

[0051] S5: Grinding and polishing internal burrs: Operate the surface remover to remove the burrs inside the cross-over pipe while performing a polishing treatment;

[0052] S6: Oil passing: Immerse the cross-over fitting 1 into an anti-rust oil tank and soak for 1 - 3 minutes;

[0053] S7: Packaging: Perform an anti-rust packaging treatment on the cross-over fitting 1.

[0054] The working principle and beneficial effects of this embodiment are as follows: After annealing the tube blank, the plasticity of the material is facilitated. Then, a preformed four-way pipe fitting 1 is processed by using a stamping sleeve or casting technology. After that, the branch ports of the four-way pipe fitting 1 are trimmed by punching or extrusion. Chamfers are made at each branch port of the four-way pipe fitting 1, and its surface is covered with burrs and frosted surfaces, making it impossible to be directly used on pipelines. The chamfered four-way pipe fitting 1 needs to be placed on a surface remover to remove the burrs and frosted surfaces on the inner wall, surface, and corners of the four-way pipe fitting. After polishing, the inner wall is polished simultaneously. After polishing, it is immersed in an anti-rust oil tank for 1 - 3 minutes and then packaged for use on the pipeline of the oil production tree injection wellhead. Thus, the problem that there are still many burrs and frosted surfaces on the surface, inner wall, and corners of the processed four-way pipe fitting, which cannot be directly applied to the oil production tree injection wellhead, is solved.

[0055] Embodiment 2:

[0056] As Figure 1 — Figure 16 As shown, a large four-way pipe for the oil production tree injection wellhead and its forming process. The surface remover in step S5 includes a four-way pipe fitting 1, a base 2, a processing chassis 3, a pipe fitting clamp 4, a pipe fitting internal grinding and polishing device 5, and a surface deburring device 6. The four-way pipe fitting 1 is placed on the pipe fitting clamp 4 for clamping. The pipe fitting clamp 4 is fixed on the processing chassis 3, and the processing chassis 3 is rotatably arranged in the base 2. A plurality of pipe fitting internal grinding and polishing devices 5 are connected to the processing chassis 3 through anchor bolts to polish the inner wall of the four-way pipe fitting 1. A surface deburring device 6 is connected to the processing chassis 3 through anchor bolts, and the surface deburring device 6 grinds and deburrs the surface and corners of the four-way pipe fitting 1.

[0057] The working principle and beneficial effects of this embodiment are as follows: By using a surface remover to deburr and polish the four-way pipe fitting 1 after facing and chamfering, the four-way pipe fitting 1 is placed on the pipe fitting clamp 4, and the pipe fitting clamp 4 is controlled to clamp the four-way pipe fitting 1. Then, a combination of pneumatic, hydraulic, and electric control is used to drive a plurality of pipe fitting internal grinding and polishing devices 5 to grind, deburr, and polish the inner wall of the four-way pipe fitting 1. By controlling the surface deburring device 6, the outer wall and the included angle of the four-way pipe fitting 1 are ground to remove the burrs and frosted surfaces on the surface.

[0058] Embodiment 3:

[0059] As Figure 1 — Figure 16 As shown, a large four-way pipe for the oil production tree injection wellhead and its forming process. A protective ring 7 is fixed at the upper end of the base 2 and is arranged around the processing chassis 3. The processing chassis 3 includes a processing disk 8 and a turntable driver 9. The processing disk 8 is arranged inside the protective ring 7 and is fixed on the transmission shaft of the turntable driver 9. The turntable driver 9 is fixed in the base 2 through a fixing seat.

[0060] The working principle and beneficial effects of this embodiment are as follows: A protective ring 7 is fixed at the upper end of the base 2 and is arranged around the processing chassis 3 to protect the use and rotation of the processing chassis 3; through the arrangement of the processing disk 8 and the turntable driver 9, the turntable driver 9 is driven to drive the processing disk 8 to rotate, so that the position of the processing disk 8 can be adjusted, facilitating the placement of the four-way pipe fitting 1 in different directions required on-site.

[0061] Embodiment 4:

[0062] As Figure 1 — Figure 16 shown, a tubing four-way joint for an oil production tree injection wellhead and its forming process, the pipe fitting clamp 4 includes a pipe fitting arc-shaped support platform 11, a fixed bracket 12, a clamping top platform 13, a jacking cylinder 14 and a support disk 15. There are multiple pipe fitting arc-shaped support platforms 11, and multiple pipe fitting arc-shaped support platforms 11 are respectively fixed in multiple fixed brackets 12. Multiple fixed brackets 12 and multiple jacking cylinders 14 are both fixed on the support disk 15. The jacking cylinder 14 drives the clamping top platform 13 to slide in the fixed bracket 12, and the support disk 15 is fixed at the middle end of the processing disk 8 of the processing chassis 3 through a support rod.

[0063] The working principle and beneficial effects of this embodiment are as follows: Place the four-way pipe fitting 1 on multiple pipe fitting arc-shaped support platforms 11 according to the required direction. The arc-shaped setting on the pipe fitting arc-shaped support platform 11 just fits and holds up the four-way pipe fitting 1 to prevent it from shaking and affecting the processing. By controlling the jacking cylinder 14 to drive the clamping top platform 13 to slide in the fixed bracket 12, the four-way pipe fitting 1 is clamped and fixed, facilitating its grinding process; the support disk 15 is fixed at the middle end of the processing disk 8 of the processing chassis 3 through a support rod, which not only plays a role in supporting the height but also facilitates the addition and grinding operations at the corresponding positions.

[0064] Embodiment 5:

[0065] As Figure 1 — Figure 16 shown, a tubing four-way joint for an oil production tree injection wellhead and its forming process, multiple threaded holes and circular slides are uniformly arranged on the processing disk 8; the internal grinding and polishing device 5 for the pipe fitting includes a slide rail base 16, an arc-shaped slide rail 17, a propulsion cylinder 18, a propulsion seat 19 and a propulsion shaft support platform 20. The lower end of the slide rail base 16 slides in the circular slide through the arc-shaped slide rail 17, and the slide rail base 16 is fixed in the threaded hole through a bolt; a propulsion cylinder 18 is fixed on the outer wall of the slide rail base 16, the propulsion cylinder 18 drives the propulsion seat 19 to slide in a limited way on the slide rail base 16, and a propulsion shaft support platform 20 is fixed on the propulsion seat 19.

[0066] The working principle and beneficial effects of this embodiment are as follows: By arranging a plurality of threaded holes and circular chutes evenly on the processing disk 8, the position of the internal grinding and polishing device 5 of different pipe fittings can be changed, so as to process non-standard four-way and three-way pipe fittings correspondingly.

[0067] The lower end of the slide rail base 16 slides in the circular chute through the arc-shaped slide rail 17, and the slide rail base 16 is fixed in the threaded hole by bolts; it is convenient for installation, disassembly and replacement of the angular position, and for grinding and processing of different styles of pipe fittings; a propulsion cylinder 18 is fixed to the outer wall of the slide rail base 16, and the propulsion cylinder 18 drives the propulsion seat 19 to slide limit on the slide rail base 16. A propulsion shaft support platform 20 is fixed on the propulsion seat 19, so as to realize the propulsion and retraction of the propulsion seat 19 and the propulsion shaft support platform 20, which is convenient for the control of the addition and retraction of the grinding.

[0068] Embodiment 6:

[0069] As Figure 1 — Figure 16 As shown, a large four-way pipe for an oil production tree injection wellhead and its forming process. A motor drive seat 22 is fixedly connected to the outside of the propulsion shaft support platform 20. The motor in the motor drive seat 22 drives the grinding rotating shaft 21 and the impurity blower 24 through gear meshing. The grinding rotating shaft 21 is rotatably connected in the propulsion shaft support platform 20, and an inner wall grinding device 23 is fixed to the inner end of the grinding rotating shaft 21; the fan impeller in the impurity blower 24 is driven by the motor drive shaft in the motor drive seat 22 through gear meshing transmission, and a flexible air duct is fixed to the inner end of the impurity blower 24.

[0070] The working principle and beneficial effects of this embodiment are as follows: The motor in the motor drive seat 22 drives the grinding rotating shaft 21 and the fan impeller of the impurity blower 24 to rotate; the propulsion shaft support platform 20 is driven to push in and withdraw, and then drives the motor drive seat 22 to slide limit on the slide rail base 16 and push in and withdraw synchronously; the grinding rotating shaft 21 is rotatably connected in the propulsion shaft support platform 20, and an inner wall grinding device 23 is fixed to the inner end of the grinding rotating shaft 21, so that the inner wall grinding device 23 is added to the pipeline for grinding and polishing; the fan impeller of the impurity blower 24 rotates to blow air. Because a flexible air duct is fixed to the inner end of the impurity blower 24, its air outlet can be correspondingly adjusted in position for blowing to remove the impurities after grinding and prevent them from affecting polishing and grinding.

[0071] Embodiment 7:

[0072] As Figure 1 — Figure 16As shown in the figure, a tubing cross-over for the injection wellhead of a Christmas tree and its forming process. The inner wall grinder 23 includes a grinding addition seat 25 and a plurality of grinding top rollers 26. The grinding addition seat 25 is fixed on the grinding rotating shaft 21. A plurality of grinding top rollers 26 are evenly arranged in the grinding addition seat 25. The inner end of the grinding addition seat 25 is conical in shape.

[0073] The working principle and beneficial effects of this embodiment are as follows: The inner end of the grinding addition seat 25 being conical in shape facilitates its addition into pipes with different diameters for use. Since a plurality of grinding top rollers 26 are evenly arranged in the grinding addition seat 25, when the rotating grinding addition seat 25 drives the plurality of grinding top rollers 26 to rotate, they can polish the inner wall of the pipe. By controlling the reciprocating automatic operation of the propulsion cylinder 18, inner wall polishing and grinding at different depths can be achieved.

[0074] Embodiment 8:

[0075] As Figure 1 — Figure 16 As shown in the figure, a tubing cross-over for the injection wellhead of a Christmas tree and its forming process. The grinding top roller 26 includes a top platform 27, a grinding rotating roller 28, and a top spring 29. A plurality of top springs 29 are fixed between the top platform 27 and the inner wall of the grinding addition seat 25. A grinding rotating roller 28 is rotatably arranged in the top platform 27.

[0076] The working principle and beneficial effects of this embodiment are as follows: Since the grinding rotating roller 28 is rotatably arranged in the top platform 27, the grinding rotating roller 28 rotates during grinding, effectively improving the grinding effect. Since a plurality of top springs 29 are fixed between the top platform 27 and the inner wall of the grinding addition seat 25, the grinding rotating roller 28 is pressed tightly against the inner wall of the pipe by the plurality of top springs 29, ensuring the efficiency of grinding and polishing. Springs of different styles and specifications can be used in combination according to different environments.

[0077] Embodiment 9:

[0078] As Figure 1 — Figure 16As shown in the figure, a tubing cross for the oil production tree injection wellhead and its forming process are provided. The surface deburring device 6 includes a fixed rail platform 30 and an adding cylinder 31. Both the fixed rail platform 30 and the adding cylinder 31 are fixed on the processing disk 8. The adding cylinder 31 drives the slide rail bracket 32 to slide limit on the fixed rail platform 30. The upper end of the slide rail bracket 32 is fixed with a longitudinal driving grinding hydraulic cylinder 33. The longitudinal driving grinding hydraulic cylinder 33 drives the surface grinding driver 34 and the surface grinding disk 35 to slide limit longitudinally within the slide rail bracket 32. The lower surface of the surface grinding disk 35 is provided with abrasive paper. A plurality of ball groove seats 36 are evenly fixed on the lower surface of the surface grinding disk 35. A spherical connecting rod 37 is hinged in the ball groove seat 36 through a sphere. The lower end of the spherical connecting rod 37 is connected with a conical grinding rod 38 through a threaded fit. The conical grinding rod 38 is inserted and ground at the corner of the cross pipe fitting 1.

[0079] The working principle and beneficial effects of this embodiment are as follows: The fixed rail platform 30 and the adding cylinder 31 are both fixed at the designated positions on the processing disk 8. By controlling the adding cylinder 31 to drive the slide rail bracket 32 to slide limit on the fixed rail platform 30, the addition, propulsion, and withdrawal of the slide rail bracket 32 are carried out, so that the longitudinal driving grinding hydraulic cylinder 33 and the surface grinding driver 34 fixed at the upper end of the slide rail bracket 32 can be advanced to the designated positions to specify the grinding positions on the outer wall of the pipe fitting. The longitudinal driving grinding hydraulic cylinder 33 drives the surface grinding driver 34 and the surface grinding disk 35 to slide limit longitudinally within the slide rail bracket 32, thereby realizing the adjustment and control of longitudinal sliding. Furthermore, it is used in combination to automatically grind longitudinally and reciprocally at the corner. The surface grinding driver 34 drives the surface grinding disk 35 to rotate. The abrasive paper provided on the lower surface of the surface grinding disk 35 can control the grinding of the outer surface of the pipe fitting when rotating. A plurality of ball groove seats 36 are evenly fixed on the lower surface of the surface grinding disk 35. A spherical connecting rod 37 is hinged in the ball groove seat 36 through a sphere. The lower end of the spherical connecting rod 37 is connected with a conical grinding rod 38 through a threaded fit, so as to prevent interference during the grinding process. The conical grinding rod 38 is inserted and ground at the corner of the cross pipe fitting 1, thereby realizing the selective grinding of the outer surface and the corner of the pipe fitting automatically, so that the operator will not be injured by burrs during use.

[0080] Example 10:

[0081] As Figure 1 — Figure 16 As shown in the figure, a tubing cross for the oil production tree injection wellhead, applicable to the forming process of the tubing cross for the oil production tree injection wellhead. Flange plates are provided at multiple ports of the cross pipe fitting 1 prepared by the above forming process for connecting the injection pipelines.

[0082] The working principle and beneficial effects of this embodiment are as follows: Flange plates are provided at multiple ports of the four-way pipe fitting 1 for connecting the water injection pipelines, which is convenient for sealing connection and use at specified pipeline positions. Different numbers and specifications of flanges can be selected and set on the four-way pipe fitting 1 according to different scenarios.

[0083] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention also belong to the protection scope of the present invention.

Claims

1. A process for forming a large four-way oil pipe for a Christmas tree water injection wellhead, characterized in that: The following steps are involved: S1: Annealing: The annealed tube blank is subjected to stamping and sleeve tapping to preform a four-way pipe fitting (1); S2: Flat end treatment: Punching or extruding the branch ends of the cross-way pipe fitting (1); S3: Chamfering: chamfering each branch port of the cross pipe fitting (1); S4: removing surface burrs: placing the annealed cross-shaped pipe fitting (1) on a surface remover to remove surface burrs; S5: Grinding internal burrs for polishing: operating the surface remover to remove the burrs inside the cross-way pipe and perform polishing at the same time; S6: Oiling: immerse the cross-shaped pipe fitting (1) in an anti-rust oil tank for 1 to 3 minutes; S7: Packaging: The cross pipe fitting (1) is packaged to prevent rust.

2. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 1, characterized in that: The surface remover in step S5 comprises a four-way pipe fitting (1), a base (2), a processing chassis (3), a pipe fitting clamp (4), a pipe fitting internal grinding and polishing device (5) and a surface deburring device (6); the four-way pipe fitting (1) is placed on the pipe fitting clamp (4) for clamping; the pipe fitting clamp (4) is fixed on the processing chassis (3); the processing chassis (3) is rotatably arranged in the base (2); a plurality of pipe fitting internal grinding and polishing devices (5) are connected to the processing chassis (3) via anchor bolts to polish the inner wall of the four-way pipe fitting (1); the surface deburring device (6) is connected to the processing chassis (3) via anchor bolts, and the surface deburring device (6) grinds and removes burrs on the surface and corners of the four-way pipe fitting (1).

3. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 2, characterized in that: A protective ring (7) is fixed at the upper end of the base (2) and is arranged on the periphery of the processing chassis (3). The processing chassis (3) includes a processing disk (8) and a turntable driver (9). The processing disk (8) is arranged in the protective ring (7) and fixed on the transmission shaft of the turntable driver (9). The turntable driver (9) is fixed in the base (2) through a fixing seat.

4. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 2, characterized in that: The pipe clamp (4) comprises a pipe arc support (11), a fixed bracket (12), a clamping top platform (13), a clamping cylinder (14) and a support plate (15). A plurality of pipe arc supports (11) are provided. The plurality of pipe arc supports (11) are respectively fixed in the plurality of fixed brackets (12). The plurality of fixed brackets (12) and the plurality of clamping cylinders (14) are all fixed on the support plate (15). The clamping top platform (13) is driven by the clamping cylinder (14) to slide in the fixed bracket (12). The support plate (15) is fixed to the middle end of the processing plate (8) of the processing chassis (3) through a support rod.

5. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 3, characterized in that: The processing disk (8) is evenly provided with a plurality of threaded holes and circular slideways; the pipe internal grinding and polishing device (5) comprises a slide rail base (16), an arc-shaped slide rail (17), a propulsion cylinder (18), a propulsion seat (19) and a propulsion shaft support platform (20); the lower end of the slide rail base (16) slides in the circular slide rail through the arc-shaped slide rail (17); the slide rail base (16) is fixed in the threaded hole by bolts; the outer wall of the slide rail base (16) is fixed with a propulsion cylinder (18); the propulsion cylinder (18) drives the propulsion seat (19) to slide on the slide rail base (16) in a limited manner; and the propulsion seat (19) is fixed with a propulsion shaft support platform (20).

6. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 5, characterized in that: The outer side of the propulsion shaft support platform (20) is fixedly connected to the motor drive seat (22), and the motor in the motor drive seat (22) drives the grinding shaft (21) and the impurity blower (24) through gear meshing. The grinding shaft (21) is rotatably connected in the propulsion shaft support platform (20), and the inner end of the grinding shaft (21) is fixed with an inner wall grinder (23); the impeller in the impurity blower (24) drives the motor drive shaft in the motor drive seat (22) through gear meshing, and the inner end of the impurity blower (24) is fixed with a flexible blowing pipe.

7. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 6, characterized in that: The inner wall grinder (23) comprises a grinding and adding seat (25) and a plurality of grinding top rollers (26); the grinding and adding seat (25) is fixed on the grinding shaft (21); a plurality of grinding top rollers (26) are evenly arranged in the grinding and adding seat (25); and the inner end of the grinding and adding seat (25) is in a conical shape.

8. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 7, characterized in that: The grinding top roller (26) comprises a top platform (27), a grinding rotating roller (28) and a tensioning spring (29). A plurality of tensioning springs (29) are fixed between the top platform (27) and the inner wall of the grinding adding seat (25). A grinding rotating roller (28) is rotatably arranged inside the top platform (27).

9. The process for forming a large cross-piece of an oil pipe for a water injection wellhead of an oil tree according to claim 7, characterized in that: The surface deburring device (6) comprises a fixed rail platform (30) and an adding cylinder (31), wherein the fixed rail platform (30) and the adding cylinder (31) are both fixed on the processing plate (8), the adding cylinder (31) drives the slide rail bracket (32) to slide on the fixed rail platform (30), and a longitudinal driving grinding hydraulic cylinder (33) is fixed on the upper end of the slide rail bracket (32), and the longitudinal driving grinding hydraulic cylinder (33) drives the surface grinding driver (34) and the surface grinding The disc (35) slides longitudinally in the slide rail bracket (32) with limited position; the lower surface of the surface grinding disc (35) is provided with sandpaper; a plurality of ball groove seats (36) are evenly fixed on the lower surface of the surface grinding disc (35); a ball connecting rod (37) is provided in the ball groove seat (36) through a ball hinge; the lower end of the ball connecting rod (37) is connected with a conical grinding rod (38) through a threaded fit; the conical grinding rod (38) is plugged and polished at the corner of the four-way pipe fitting (1).

10. A large tubing spool for a Christmas tree water injection wellhead, suitable for the large tubing spool molding process for a Christmas tree water injection wellhead according to any one of claims 1 to 9, characterized in that: The four-way pipe fitting (1) prepared by the above-mentioned molding process is provided with flanges at multiple ports for connecting with water injection pipes.

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