Wellhead pressing oil pipe setting device

Abstract

The invention relates to the technical field of oil production engineering, in particular to a well mouth pressing oil pipe setting device. The well mouth pressing oil pipe setting device comprises a radish head adjusting assembly, an upper bearing beam combination assembly, two large oil cylinder assemblies and a base assembly, the two large oil cylinder assemblies comprise the first large oil cylinder assembly and the second large oil cylinder assembly, and the two large oil cylinder assemblies are arranged on the two sides of the upper bearing beam combination assembly respectively. A wellhead is arranged at the lower end of the base assembly, and a casing head is arranged at the lower end of the wellhead. According to the well mouth pressing oil pipe setting device, the radish head adjusting assembly and the large oil cylinder assembly are connected together through the upper bearing beam combination assembly, the weight of a whole underground oil pipe column acts on the upper bearing beam combination assembly, the large oil cylinder assembly controls the upper bearing beam combination assembly to move, the base assembly tightly holds an oil pipe in the center of a well mouth, and the oil pipe in the center of the well mouth is adjusted. And the oil sleeve annulus can be sealed at any time, so that the aims of step-by-step setting and step-by-step sealing examination of the multi-stage packer are fulfilled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production engineering, and particularly relates to a wellhead down pressure tubing setting device. BACKGROUND

[0002] The downhole oil-water separation injection and production process technology is a kind of oilfield production technology currently used, which realizes the simultaneous injection and production by separating the produced fluid in the wellbore. This technology can improve the oilfield recovery and realize the sustainable development of the oilfield. When the downhole oil-water separation injection and production process technology is implemented, the downhole packer is used to isolate the injection layer to ensure that all the separated water in the downhole is injected into the injection layer. If the injection layer needs to be layered for water injection, the injection layer needs to be finely divided into multiple small layers, and then the multiple-stage downhole packer is used to isolate the multiple small layers. The setting mode of the multiple-stage downhole packer is compression setting, that is, the downhole tubing string is compressed and set at the wellhead. When setting down, each packer should be subjected to sufficient setting force to ensure that each packer is effectively sealed. In order to realize the step-by-step setting and sealing, the multiple-stage downhole packer adopts a delay packer. When the uppermost packer and the lowermost packer are set at the same time, the two packers need to be sealed. If the sealing is qualified, the downhole tubing string needs to be continuously pressed at the wellhead to set and seal the middle packer or two packers. SUMMARY

[0003] (I) Technical problem to be solved The present application provides a wellhead down pressure tubing setting device to overcome the problem that the existing technology cannot effectively seal and step-by-step seal the multiple-stage downhole packer.

[0004] (II) Technical scheme To achieve the above-mentioned purpose, the present application provides a wellhead down pressure tubing setting device, which comprises a radish head adjusting assembly, an upper bearing beam combined assembly, two large oil cylinder assemblies and a base assembly. The two large oil cylinder assemblies comprise a first large oil cylinder assembly and a second large oil cylinder assembly. The upper bearing beam combined assembly is connected with the radish head adjusting assembly, and the radish head adjusting assembly presses the upper bearing beam combined assembly. The two large oil cylinder assemblies are respectively arranged on the two sides of the upper bearing beam combined assembly. The base assembly is provided with a wellhead at the lower end. The base assembly is connected with the wellhead through a plurality of wellhead bolts. The plurality of wellhead bolts are respectively fixed by wellhead nuts. The wellhead is provided with a casing head at the lower end. The casing head is connected with the wellhead through a plurality of casing head bolts. The plurality of casing head bolts are respectively fixed by casing head nuts.

[0005] Preferably, the radish head adjustment assembly includes: a coupling, a lifting sub, a variable threaded connector, a locking cap, a lifting tube, an adjustment spare cap, a transmission sleeve, several bolts, packing, a radish head, a telescopic tube fixing sleeve, a telescopic tube shorting O-ring, a lifting tube O-ring, a telescopic tube shorting, and a protective sleeve. The coupling is located at the upper end of the lifting section. The upper end of the variable buckle joint is connected to the lifting section, and the lower end of the variable buckle joint is connected to the lifting tube. The locking cap, adjusting cap, transmission sleeve, and radish head are sequentially fitted onto the lifting tube from top to bottom. The transmission sleeve is located at the upper end of the radish head and is connected to the radish head by several bolts. The lower end of the radish head is connected to the telescopic tube fixing sleeve, and the lower end of the telescopic tube fixing sleeve is connected to the protective sleeve. The lifting tube passes through the inside of the radish head and is short-connected to the telescopic tube. The outer wall of the telescopic tube short joint and the inner wall of the telescopic tube fixing sleeve are provided with trapezoidal threads, and the telescopic tube fixing sleeve can drive the radish head to move axially by rotation; An O-ring is provided between the lifting tube and the telescopic tube short joint. The lifting tube O-ring is used to seal the interface between the lifting tube and the telescopic tube short joint. An O-ring is fitted on the upper end of the telescopic tube short joint. The telescopic tube short joint O-ring is used to seal the gap between the telescopic tube fixing sleeve and the telescopic tube short joint.

[0006] Preferably, the upper load-bearing beam assembly includes: two load-bearing blocks, two stiffening plates, two upper liners, two lifting lugs, two lower liners, a bearing housing, a main shaft, bearing A, bearing B, a spare cap, a lug plate, and an intermediate connecting plate. The load-bearing blocks have a circular through hole in the center. The two load-bearing blocks include a left load-bearing block and a right load-bearing block. The bearing housing is fitted with the main shaft, bearing A, and bearing B in sequence from top to bottom. The main shaft has a through hole in the center. The load-bearing blocks, lower liners, stiffening plates, upper liners, and lifting lugs are symmetrically arranged on the left and right sides of the main shaft, respectively. The right side of the left load-bearing block has a lower liner, stiffening plate, upper liner, and lifting lug in sequence from bottom to top. The lower liner, stiffening plate, upper liner, and lifting lug are welded to the bearing housing. The spare cap is located at the upper end of the main shaft and is used to position bearing A and bearing B. The bearing block is provided with ear plates on the front and rear sides respectively. The ear plates are connected by a middle connecting plate. The main shaft is provided with a through hole at the center. The size of the through hole matches the lifting tube. The upper bearing beam assembly is located on the adjustment cap. The upper bearing beam assembly is limited by the locking cap.

[0007] Preferably, the large hydraulic cylinder assembly includes: a lifting ring, a piston rod, a piston rod spare cap, a scale seat, an outer snap ring, a scale guide sleeve, a scale guide sleeve bolt, a scale fixing bolt, a guide sleeve, a scale, a dust seal, a U-ring, a Hemosley ring, a Step seal, an upper pipe joint, a guide sleeve oil inlet channel, a piston sleeve, a piston sleeve spare cap, a piston sleeve locking cap, a piston, an O-ring, a piston Hemosley ring, a piston Glyd ring, a pin, a cylinder bottom, a lower pipe joint, and a cylinder bottom oil inlet channel; The lower end of the lifting ring is provided with a piston rod, the outer wall of the upper end of the piston rod is sleeved with a piston rod spare cap, the outer wall of the piston rod is provided with an annular groove, the scale seat is sleeved on the piston rod, the left end of the scale seat is arranged in the annular groove of the piston rod, the scale seat is fixed by an outer snap spring, the piston rod is inserted into the piston sleeve through the guide sleeve, the guide sleeve is arranged on the upper end of the piston sleeve, the guide sleeve is threadedly connected with the piston sleeve, the outer wall of the upper end of the piston sleeve is provided with a scale guide sleeve, the scale guide sleeve is fixed on the outer wall of the guide sleeve by a scale guide sleeve bolt, the scale passes through the scale seat and the scale guide sleeve from top to bottom, the upper end of the scale is provided with a through hole, a scale fixing bolt passes through the through hole to fix the scale on the scale seat, and the scale guide sleeve is used for righting the scale; The guide sleeve is in an annular structure, the inner wall of the guide sleeve is sequentially provided with a dustproof ring, a U-shaped ring, a Hymus ring and a Stoff from top to bottom, the dustproof ring, the U-shaped ring, the Hymus ring and the Stoff cooperate with the outer surface of the piston rod to play a sealing role, the guide sleeve is provided with a guide sleeve oil inlet channel, the outer wall of the left end of the guide sleeve is provided with a threaded hole, the threaded hole is in communication with the guide sleeve oil inlet channel, and a pipe joint is arranged in the threaded hole; The outer wall of the piston sleeve is sleeved with a piston sleeve spare cap and a piston sleeve locking cap from top to bottom, the lower end of the piston rod is threadedly connected with a piston, the connection between the piston and the piston rod is provided with a pin, an O-shaped ring is arranged between the piston rod and the piston, the O-shaped sealing ring seals the gap between the piston rod and the piston, the outer wall of the piston is sleeved with a piston Hymus ring and a piston Gley ring from top to bottom, the lower end of the piston sleeve is provided with a cylinder bottom, the inner wall of the cylinder bottom is provided with a threaded hole, the threaded hole of the inner wall of the cylinder bottom is connected with a cylinder bottom oil inlet channel, and a lower pipe joint is arranged in the cylinder bottom oil inlet channel.

[0008] Preferably, the piston is filled with hydraulic oil, and the entering and discharging of the hydraulic oil in the piston drives the piston and the piston rod to move in the piston sleeve, and the piston rod drives the upper bearing beam assembly to move up and down.

[0009] Preferably, the base assembly comprises a plurality of oil cylinder bottom screws, a plurality of oil cylinder bottom nuts, two oil cylinder bottoms, a left piston sleeve, a left oil cylinder bottom oil inlet channel, a pipe joint A, a left piston rod, a piston rod Gley ring, a piston rod guide belt, a left guide sleeve, a bearing flange, a plurality of bearing flange nuts, a plurality of bearing flange bolts, a guide sleeve O-shaped ring, a guide sleeve Stoff, a guide sleeve dustproof ring, a pipe joint B, a left guide sleeve oil inlet channel, a piston rod connecting pin, a left sealing plate, an upper sealing plate, an upper sealing plate bolt, a right sealing plate, a right piston rod, a right guide sleeve, a pipe joint C, a right guide sleeve oil inlet channel, a right piston sleeve, a pipe joint D and a right oil cylinder bottom oil inlet channel. The two cylinder bases include a left cylinder base and a right cylinder base. The left cylinder base has several threaded holes at its left end, each containing a cylinder base screw. These screws connect the left cylinder base to the left piston sleeve and are positioned by cylinder base nuts. The bottom of the left cylinder base has a threaded hole containing a pipe connector A. An oil inlet channel is located in the left cylinder base and communicates with the threaded hole at the bottom. The right end of the left cylinder base has a left piston sleeve containing a left piston rod. The left piston rod has a piston rod glide ring and a piston rod guide band fitted at its left end, and its right end inserted into the left guide sleeve. Several bearing flange bolts pass through the bearing flange sequentially. The flange, left guide sleeve, and left piston sleeve are locked by the bearing flange nut. The inner wall of the left guide sleeve has three annular grooves, and the three annular grooves are respectively provided with a guide sleeve O-ring, a guide sleeve step seal, and a guide sleeve dustproof ring. The guide sleeve O-ring, guide sleeve step seal, and guide sleeve dustproof ring are used to seal the gap between the left piston rod and the left guide sleeve. The left guide sleeve has a left guide sleeve oil inlet channel, which is connected to pipe joint B. The right end of the left piston rod has a slot, and a threaded hole is provided perpendicular to the slot. The left end of the left sealing plate has a cylindrical structure. The left end of the left sealing plate is inserted into the slot at the right end of the left piston rod. The piston rod connecting pin is provided in the threaded hole to connect the left sealing plate and the left piston rod. The left sealing plate is symmetrically provided with a right sealing plate. The right end of the right sealing plate has a cylindrical structure. The left end of the right piston rod has a slot, and a threaded hole is provided perpendicular to the slot. The right end of the right sealing plate is inserted into the slot at the left end of the right piston rod. A piston rod connecting pin is provided in the threaded hole, which connects the right sealing plate and the right piston rod. The left guide sleeve is symmetrically provided with a right guide sleeve, and the left piston sleeve is symmetrically provided with a right piston sleeve. Several bearing flange bolts pass through the bearing flange, the right guide sleeve, and the right piston sleeve and are locked by nuts on the bearing flange side. The inner wall of the right guide sleeve has three annular grooves, and the three annular grooves respectively provide a guide sleeve dustproof ring, a guide sleeve seal, and a guide sleeve O-ring. The guide sleeve dust seal, guide sleeve seal, and guide sleeve O-ring are used to seal the gap between the right piston rod and the right guide sleeve. The right guide sleeve has a right guide sleeve oil inlet channel, which is connected to pipe joint C. The left end of the right piston rod is inserted into the right guide sleeve, and the right end of the right piston rod is fitted with a piston rod guide belt and a piston rod glyph. The left cylinder bottom is symmetrically provided with the right cylinder bottom. The right end of the right piston sleeve has several threaded holes. Several cylinder bottom screws pass through the right cylinder bottom in sequence and connect to the threaded holes on the right end of the right piston sleeve. The several cylinder bottom screws are respectively positioned by cylinder bottom nuts. The right cylinder bottom has a right cylinder bottom oil inlet channel, and the right cylinder bottom is connected to pipe joint D.

[0010] Preferably, the upper surface of the upper sealing plate is provided with a plurality of threaded holes, the upper surface of the bearing flange is provided with a plurality of threaded holes, and upper sealing plate bolts are respectively provided in the threaded holes, and the upper sealing plate and the bearing flange are connected by the upper sealing plate bolts.

[0011] Preferably, the left sealing plate and the right sealing plate are connected by a left piston rod and a right piston rod, respectively. The left piston rod and the right piston rod move axially in the left piston sleeve and the right piston sleeve, respectively, by the entry and exit of hydraulic oil. This drives the left sealing plate and the right sealing plate to move towards the center of the wellhead at the same time, which can hold the oil pipe at the center of the wellhead and achieve sealing of the annulus at any time.

[0012] (III) Beneficial Effects This invention provides a wellhead downhole tubing setting device. After setting each stage of the downhole packer via a radish-head adjustment assembly, the radish-head adjustment assembly seals with the wellhead. This allows for the pumping of crude oil from the wellbore to verify the seal of each stage of the downhole packer. The radish-head adjustment assembly is connected to two large hydraulic cylinder assemblies via an upper bearing beam assembly, ensuring that the entire weight of the downhole tubing string is fully distributed on the upper bearing beam assembly. Two large hydraulic cylinder assemblies, located on either side of the upper bearing beam assembly, control its vertical movement. The base assembly grips the tubing at the center of the wellhead, ensuring the annulus is sealed at all times. This achieves the purpose of progressively setting and verifying the seal of multi-stage packers in the downhole oil-water separation injection-production process. Attached Figure Description

[0013] Figure 1 This diagram shows a schematic of the assembly structure of a wellhead pressurized tubing setting device according to the present invention. Figure 2 This diagram illustrates the structure of a wellhead pressurized tubing setting device according to the present invention. Figure 3 This diagram illustrates the structure of the radish head adjustment assembly of the wellhead pressure tubing setting device according to the present invention. Figure 4 This diagram illustrates the structural structure of the upper load-bearing beam assembly of a wellhead pressurized tubing setting device according to the present invention. Figure 5 This diagram shows a top view of the upper load-bearing beam assembly of a wellhead pressurized tubing setting device according to the present invention. Figure 6 This diagram shows the structural schematic of the large hydraulic cylinder assembly of the present invention; Figure 7 A schematic diagram of the base assembly structure of the present invention is shown.

[0014] 1: Radish head adjusting assembly; 1-1: Coupling; 1-2: Lifting nipple; 1-3: Variable-diameter coupling; 1-4: Locking cap; 1-5: Lifting pipe; 1-6: Adjustment backup cap; 1-7: Transmission sleeve; 1-8: Bolt; 1-9: Packing; 1-10: Radish head; 1-11: Telescopic pipe fixing sleeve; 1-12: Telescopic pipe short-circuit O-ring; 1-13: Lifting pipe O-ring; 1-14: Telescopic pipe short circuit; 1-15: Protective sleeve; 2: Upper bearing beam assembly; 2-1: Bearing block; 2-2: Rib plate; 2-3: Upper lining plate; 2-4: Lifting lug; 2-5: Lower lining plate; 2-6: Bearing seat; 2-7: Main shaft; 2-8: Bearing A; 2-9: Bearing B; 2-10: Backup cap; 2-11: Ear plate; 2-12: Intermediate connecting plate; 3: Large oil cylinder assembly; 3-1: Lifting ring; 3-2: Piston rod; 3-3: Backup cap of piston rod; 3-4: Scale seat; 3-5: Outer snap spring; 3-6: Scale guide sleeve; 3-7: Scale guide sleeve bolt; 3-8: Scale fixing bolt; 3-9: Guide sleeve; 3-10: Scale; 3-11: Dustproof ring; 3-12: U-shaped ring; 3-13: Hymus ring; 3-14: Ster seal; 3-15: Upper pipe joint; 3-16: Oil inlet channel of guide sleeve; 3-17: Piston sleeve; 3-18: Backup cap of piston sleeve; 3-19: Locking cap of piston sleeve; 3-20: Piston; 3-21: O-ring; 3-22: Hymus ring of piston; 3-23: Gleit ring of piston; 3-24: Pin; 3-25: Cylinder bottom; 3-26: Lower pipe joint; 3-27: Oil inlet channel of cylinder bottom; 4: Base assembly; 4-1: Oil cylinder bottom screw; 4-2: Oil cylinder bottom nut; 4-3: Oil cylinder bottom; 4-4: Left piston sleeve; 4-5: Oil inlet channel of left oil cylinder bottom; 4-6: Pipe joint A; 4-7: Left piston rod; 4-8: Gleit ring of piston rod; 4-9: Guide belt of piston rod; 4-10: Left guide sleeve; 4-11: Bearing flange; 4-12: Nut of bearing flange; 4-13: Bolt of bearing flange; 4-14: O-ring of guide sleeve; 4-15: Ster seal of guide sleeve; 4-16: Dustproof ring of guide sleeve; 4-17: Pipe joint B; 4-18: Oil inlet channel of left guide sleeve; 4-19: Connecting pin of piston rod; 4-20: Left sealing plate; 4-21: Upper sealing plate; 4-22: Bolt of upper sealing plate; 4-23: Right sealing plate; 4-24: Right piston rod; 4-25: Right guide sleeve; 4-26: Pipe joint C; 4-27: Oil inlet channel of right guide sleeve; 4-28: Right piston sleeve; 4-29: Pipe joint D; 4-30: Oil inlet channel of right oil cylinder bottom; 5: Wellhead bolt; 6: Wellhead nut; 7: Wellhead; 8: Pipe head bolt; 9: Pipe head nut; 10: Casing head. DETAILED DESCRIPTION

[0015] The present application will be described in detail below with reference to the drawings and embodiments, and the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0016] In the description of the present application, it is necessary to understand that the orientations or positional relationships indicated by "up", "down", "left", "right", "inner", "outer", "top" and "bottom" are all based on the orientations or positional relationships shown in the drawings, and the purpose is only to facilitate the description of the present application and simplify the description, and it does not indicate or imply that the indicated parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0017] As shown in Figures 1-7 The present application provides a wellhead downhole tubing setting device, which comprises a carrot adjusting assembly 1, an upper bearing beam combined assembly 2, two large oil cylinder assemblies 3 and a base assembly 4. The carrot adjusting assembly 1 is mainly used for adjusting the position of the upper bearing beam combined assembly 2, which is the main bearing part of the device, used for supporting the weight of the tubing and transmitting pressure during setting, and is usually made of high-strength steel, having good bearing capacity and fatigue resistance. The two large oil cylinder assemblies 3 comprise a first large oil cylinder assembly and a second large oil cylinder assembly, which are used to provide the force required during setting, to realize pressure regulation of the upper bearing beam combined assembly 2, and the base assembly 4 is used to be installed on the wellhead 7 and firmly connected with the wellhead 7 and the casing head 10 through wellhead bolts 5 and casing head bolts 8, and is usually made of high-strength steel, having good stability and bearing capacity. The wellhead 7 is the opening part of the oil well, used for installing casing and tubing equipment. The wellhead 7 is connected with the base assembly 4 through a plurality of wellhead bolts 5, which are fixed by wellhead nuts 6 to ensure the stability of the device during setting. The casing head 10 is arranged below the wellhead 7, used for connecting the casing and the tubing, to ensure the sealing of the tubing in the well. The casing head 10 is connected with the wellhead 7 through a plurality of casing head bolts 8, which are fixed by casing head nuts 9. The carrot adjusting assembly 1 comprises a coupling 1-1, a lifting nipple 1-2, a variable buckle joint 1-3, a locking cap 1-4, a lifting pipe 1-5, an adjusting backup cap 1-6, a transmission sleeve 1-7, a plurality of bolts 1-8, a packing 1-9, a carrot 1-10, an extension pipe fixing sleeve 1-11, an extension pipe short connection O-ring 1-12, a lifting pipe O-ring 1-13, an extension pipe short connection 1-14 and a protective sleeve 1-15. The coupling 1-1 is installed on the upper end of the lifting section 1-2, allowing the lifting section 1-2 to connect to the upper end of the variable coupling 1-3. The lower end of the variable coupling 1-3 is connected to the lifting tube 1-5. The locking cap 1-4, adjusting cap 1-6, transmission sleeve 1-7, and radish head 1-10 are sequentially fitted onto the lifting tube 1-5 from top to bottom. The transmission sleeve 1-7 is located at the upper end of the radish head 1-10 and is tightly connected to the radish head 1-10 by several bolts 1-8. The lower end of the radish head 1-10 is connected to the telescopic tube fixing sleeve 1-11, and the lower end of the telescopic tube fixing sleeve 1-11 is connected to the protective sleeve 1-15. The lifting tube 1-5 passes through the inside of the radish head 1-10 and is connected to the telescopic tube short connector 1-14. Both the outer wall of the telescopic tube short connector 1-14 and the inner wall of the telescopic tube fixing sleeve 1-11 are provided with trapezoidal threads. The trapezoidal threads allow the telescopic tube fixing sleeve 1-11 to drive the carrot head 1-10 to move axially by rotating, thereby adjusting the position of the carrot head 1-10. An O-ring 1-13 is provided between the lifting tube 1-5 and the telescopic tube short-connection 1-14. The O-ring 1-13 is used to seal the interface between the lifting tube 1-5 and the telescopic tube short-connection 1-14 to ensure the sealing performance of the device.

[0018] like Figure 4 As shown, the upper load-bearing beam assembly 2 includes: 2 load-bearing blocks 2-1, 2 stiffening plates 2-2, 2 upper lining plates 2-3, 2 lifting lugs 2-4, 2 lower lining plates 2-5, bearing seats 2-6, main shaft 2-7, bearing A 2-8, bearing B 2-9, spare cap 2-10, ear plate 2-11, and intermediate connecting plate 2-12; The bearing housing 2-6 is fitted with a main shaft 2-7, bearing A2-8 and bearing B2-9 from top to bottom. The main shaft 2-7 has a through hole in the center, the size of which matches the lifting tube 1-5. The two bearing blocks 2-1 include a left bearing block and a right bearing block. The main shaft 2-7 is symmetrically provided with bearing blocks 2-1, lower liner 2-5, stiffening plate 2-2, upper liner 2-3 and lifting lug 2-4 on the left and right sides respectively. A spare cap 2-10 is provided at the upper end of the main shaft 2-7. The spare cap 2-10 is used to position bearing A2-8 and bearing B2-9 to ensure their stability and reliability during use. The right side of the left bearing block is provided with a lower liner plate 2-5, a stiffening plate 2-2, an upper liner plate 2-3, and a lifting lug 2-4 from bottom to top. The lower liner plate 2-5, the stiffening plate 2-2, the upper liner plate 2-3, and the lifting lug 2-4 are welded to the bearing seat 2-6. The bearing block 2-1 has ear plates 2-11 on the front and rear sides respectively. The ear plates 2-11 are connected together by the intermediate connecting plate 2-12, so that the left and right bearing blocks can be more stable when bearing loads, and the structural strength of the entire upper bearing beam assembly 2 is improved.

[0019] As Figure 6 shown, the large oil cylinder assembly 3 includes: a lifting ring 3-1, a piston rod 3-2, a piston rod spare cap 3-3, a scale seat 3-4, an outer spring 3-5, a scale guide sleeve 3-6, a scale guide sleeve bolt 3-7, a scale fixing bolt 3-8, a guide sleeve 3-9, a scale 3-10, a dust ring 3-11, a U-shaped ring 3-12, a Hymus coil 3-13, a Stoff 3-14, an upper pipe joint 3-15, a guide sleeve oil inlet channel 3-16, a piston sleeve 3-17, a piston sleeve spare cap 3-18, a piston sleeve locking cap 3-19, a piston 3-20, an O-shaped ring 3-21, a piston Hymus coil 3-22, a piston Glea ring 3-23, a pin 3-24, a cylinder bottom 3-25, a lower pipe joint 3-26, and a cylinder bottom oil inlet channel 3-27; The lower end of the lifting ring 3-1 is provided with a piston rod 3-2, the upper end of the piston rod 3-2 is provided with a piston rod spare cap 3-3, an annular groove is provided on the outer wall of the piston rod 3-2, a scale seat 3-4 is sleeved on the piston rod 3-2, the left end of the scale seat 3-4 is located in the annular groove of the piston rod 3-2, the scale seat 3-4 is fixed by an outer spring 3-5, the piston rod 3-2 passes through the guide sleeve 3-9 and is inserted into the piston sleeve 3-17, the guide sleeve 3-9 is arranged at the upper end of the piston sleeve 3-17 and is connected with the piston sleeve 3-17 by threads; The upper end of the piston sleeve 3-17 is provided with a scale guide sleeve 3-6, the scale guide sleeve 3-6 is fixed on the outer wall of the guide sleeve 3-9 by a scale guide sleeve bolt 3-7, the upper end of the scale 3-10 is provided with a through hole, the scale 3-10 passes through the scale seat 3-4 and the scale guide sleeve 3-6 from top to bottom in turn, a scale fixing bolt 3-8 passes through the through hole of the scale 3-10 to fix the scale 3-10 on the scale seat 3-4, the scale guide sleeve 3-6 is used to support the scale 3-10; The inner wall of the guide sleeve 3-9 is sequentially provided with a dust ring 3-11, a U-shaped ring 3-12, a Hymus coil 3-13 and a Stoff 3-14 from top to bottom, the dust ring 3-11, the U-shaped ring 3-12, the Hymus coil 3-13 and the Stoff 3-14 can cooperate with the outer surface of the piston rod 3-2 to play a sealing role, the guide sleeve 3-9 is provided with a guide sleeve oil inlet channel 3-16, a threaded hole is provided on the outer wall of the left end of the guide sleeve 3-9, the threaded hole is in communication with the guide sleeve oil inlet channel 3-16, and an upper pipe joint 3-15 is arranged in the threaded hole; The piston sleeve 3-17 has a piston sleeve cap 3-18 and a piston sleeve locking cap 3-19 fitted on its outer wall from top to bottom. The piston rod 3-2 is threaded to the piston 3-20 at its lower end. A pin 3-24 is provided at the connection between the piston 3-20 and the piston rod 3-2. An O-ring 3-21 is provided between the piston rod 3-2 and the piston 3-20. The O-ring 3-21 is used to seal the gap between the piston rod 3-2 and the piston 3-20. The piston 3-20 has a piston Hemosley ring 3-22 and a piston Glyd ring 3-23 fitted on its outer wall from top to bottom. The piston sleeve 3-17 has a cylinder bottom 3-25 at its lower end. The cylinder bottom 3-25 has a threaded hole on its inner wall. The threaded hole is connected to the cylinder bottom oil inlet channel 3-27. A lower pipe connector 3-26 is provided in the cylinder bottom oil inlet channel 3-27.

[0020] like Figure 7 As shown, the base assembly 4 includes: several cylinder bottom screws 4-1, several cylinder bottom nuts 4-2, two cylinder bottoms 4-3, a left piston sleeve 4-4, a left cylinder bottom oil inlet channel 4-5, pipe connector A 4-6, a left piston rod 4-7, a piston rod gleditsiab ring 4-8, a piston rod guide band 4-9, a left guide sleeve 4-10, a bearing flange 4-11, several bearing flange nuts 4-12, several bearing flange bolts 4-13, a guide sleeve O-ring 4-14, and a guide... The components are: Step seal 4-15, guide sleeve dust seal 4-16, pipe joint B4-17, left guide sleeve oil inlet channel 4-18, piston rod connecting pin 4-19, left sealing plate 4-20, upper sealing plate 4-21, upper sealing plate bolt 4-22, right sealing plate 4-23, right piston rod 4-24, right guide sleeve 4-25, pipe joint C4-26, right guide sleeve oil inlet channel 4-27, right piston sleeve 4-28, pipe joint D4-29, and right cylinder bottom oil inlet channel 4-30. The two oil cylinder bottoms 4-3 include a left oil cylinder bottom and a right oil cylinder bottom, the left oil cylinder bottom is provided with a plurality of threaded holes at a left end, and oil cylinder bottom screws 4-1 are respectively arranged in the threaded holes, the oil cylinder bottom screws 4-1 are connected with the left oil cylinder bottom and a left piston sleeve 4-4, the oil cylinder bottom screws 4-1 are respectively positioned by oil cylinder bottom nuts 4-2, the oil cylinder bottom screws 4-1 play a role in connecting the left oil cylinder bottom and the left piston sleeve 4-4 and are positioned by the oil cylinder bottom nuts 4-2 to ensure stability during operation, the left oil cylinder bottom is provided with a threaded hole at a bottom, the threaded hole is used for installing a pipe joint A 4-6, the pipe joint A 4-6 is connected with an oil inlet channel 4-5, the oil inlet channel 4-5 is communicated with the threaded hole at the bottom, and the oil inlet channel 4-5 is responsible for guiding hydraulic oil into the left piston sleeve 4-4 to drive the left piston rod 4-7 to move, the left piston sleeve 4-4 is provided with the left piston rod 4-7, the left piston rod 4-7 can stably reciprocate under the assistance of a piston rod gasket 4-8 and a piston rod guide belt 4-9, the left piston rod 4-7 is provided with the piston rod gasket 4-8 and the piston rod guide belt 4-9 at a left end, the piston rod gasket 4-8 is used for preventing hydraulic oil from leaking, and the piston rod guide belt 4-9 helps guide the left piston rod 4-7 to move along a correct track, the left piston rod 4-7 is inserted into a left guide sleeve 4-10 at a right end, the left guide sleeve 4-10 is locked with a bearing flange 4-11 and a bearing flange nut 4-12 through a bearing flange bolt 4-13, an inner wall of the left guide sleeve 4-10 is provided with three annular grooves for respectively installing a guide sleeve O-ring 4-14, a guide sleeve seal 4-15 and a guide sleeve dustproof ring 4-16, the sealing rings can effectively prevent hydraulic oil from leaking and prevent dust and impurities from entering the hydraulic system, the left guide sleeve 4-10 is provided with a left guide sleeve oil inlet channel 4-18, the left guide sleeve oil inlet channel 4-18 is connected with a pipe joint B 4-17, and the pipe joint B 4-17 is used for providing hydraulic oil for the left piston rod 4-7, a right end of the left piston rod 4-7 is provided with a slot hole, the slot hole is provided with a threaded hole in a vertical direction, a left sealing plate 4-20 is in a cylindrical structure and can be inserted into the slot hole at the right end of the left piston rod 4-7, and a piston rod connecting pin 4-19 is arranged in the threaded hole to connect the left sealing plate 4-20 and the left piston rod 4-7; The left sealing plate 4-20 is symmetrically provided with a right sealing plate 4-23. The right end of the right sealing plate 4-23 has a cylindrical structure. The left end of the right piston rod 4-24 has a slot. The vertical direction of the slot has a threaded hole. The right end of the right sealing plate 4-23 is inserted into the slot at the left end of the right piston rod 4-24. The piston rod connecting pin 4-19 is provided in the threaded hole in the vertical direction of the slot. The left guide sleeve 4-10 is symmetrically provided with a right guide sleeve 4-25. The right guide sleeve 4-25 is used to guide the movement trajectory of the right piston rod 4-24. The left piston sleeve 4-4 is symmetrically provided with a right piston sleeve 4-28. The bearing flange bolt 4-13 passes through the bearing flange 4-11, the right guide sleeve 4-25 and the right piston sleeve 4-28, and is locked by the bearing flange side nut 4-12. The inner wall of the right guide sleeve 4-25 has three annular grooves for installing the guide sleeve dust seal 4-16, the guide sleeve step seal 4-15, and the guide sleeve O-ring 4-14, respectively. These seals effectively prevent hydraulic oil leakage and prevent dust and impurities from entering the hydraulic system. The right guide sleeve 4-25 has a right guide sleeve oil inlet channel 4-27, which connects to pipe fitting C4-26. Pipe fitting C4-26 and the right guide sleeve oil inlet channel 4-27 supply hydraulic oil to the right piston rod 4-24. The left end of 4-24 is inserted into the right guide sleeve 4-25. The right end of 4-24 is fitted with a piston rod guide band 4-9 and a piston rod glyph 4-8. The right end of the right piston sleeve 4-28 is provided with several threaded holes. Several cylinder bottom screws 4-1 pass through the right cylinder bottom in sequence and connect with the threaded holes provided on the right end of the right piston sleeve 4-2. The several cylinder bottom screws 4-1 are respectively positioned by the cylinder bottom nut 4-2 to fix the right piston sleeve 4-28 and the right cylinder bottom. The right cylinder bottom is provided with a right cylinder bottom oil inlet channel 4-30 to guide hydraulic oil into the right piston sleeve 4-28. The upper sealing plate 4-21 is located above the bearing flange 4-11. The upper surface of the upper sealing plate 4-21 has several threaded holes, the position and size of which correspond to the threaded holes on the upper surface of the bearing flange 4-11. The upper sealing plate bolts 4-22 are respectively installed in the several threaded holes, and the upper sealing plate bolts 4-22 connect the upper sealing plate 4-21 to the bearing flange 4-11. The left sealing plate 4-20 and the right sealing plate 4-23 are connected by the left piston rod 4-7 and the right piston rod 4-24, respectively. The left piston rod 4-7 and the right piston rod 4-24 are two independent components, which are installed in the left piston sleeve 4-4 and the right piston sleeve 4-28, respectively. The axial movement of the left piston rod 4-7 and the right piston rod 4-24 can be achieved by the entry and exit of hydraulic oil, which drives the left sealing plate 4-20 and the right sealing plate 4-23 to move towards the center of the wellhead 7, so that they can tightly hold the oil pipe at the center of the wellhead 7 and achieve sealing of the annulus at any time.

[0021] The following is a detailed description of the actual working scenario of the wellhead pressurized tubing setting device.

[0022] In actual work, after the last tubing is lowered, the radish head adjusting assembly 1 is connected with the tubing, the well completion string is lifted, the radish head adjusting assembly 1 is lowered to the designated position, the coupling 1-1, the lifting nipple 1-2, the variable buckle joint 1-3 and the locking cap 1-4 of the radish head adjusting assembly 1 are disassembled, the main shaft 2-7 of the upper bearing beam assembly 2 is passed through the lifting pipe 1-5 of the radish head adjusting assembly 1, the upper bearing beam assembly 2 is seated on the adjusting cap 1-6 of the radish head adjusting assembly 1, the locking cap 1-4 is locked and pressed with the lifting pipe 1-5 to compress the upper bearing beam assembly 2, the variable buckle joint 1-3, the lifting nipple 1-2 and the coupling 1-1 of the radish head adjusting assembly 1 are sequentially connected with the lifting pipe 1-5, the coupling 1-1 of the radish head adjusting assembly 1 is lifted to lift the entire tubing string, and the tubing string hanging weight is recorded at the same time, the tubing string is slowly lowered, the tubing string is synchronously positively rotated to anchor and set the lowermost packer, the distance between the lower end surface of the tubing hanger and the upper end surface of the original wellhead 7 is required to be 50-60 cm after setting, the position of the scale 3-10 in the large oil cylinder assembly 3 is recorded at the same time, the tubing string is slowly lifted afterwards, and the tubing string hanging weight is recorded, the lifting is stopped when the hanging weight is 3 t, the upper bearing beam assembly 2 is rotated by 90 degrees, the hydraulic oil is loaded to the large oil cylinder assembly 3, the piston rod 3-2 and the piston 3-20 of the large oil cylinder assembly 3 are moved upwards, the piston rod 3-2 of the large oil cylinder assembly 3 is passed through the center through holes of the left bearing block and the right bearing block in the upper bearing beam assembly 2, the upper bearing beam assembly 2 is seated on the piston rod 3-2, the piston rod 3-2 is connected with the upper end of the piston rod 3-2 by using the piston rod cap 3-3, the tubing string is lifted when the hanging weight is reduced to 0 t, the piston rod cap 3-3 is locked, and the lifting state is maintained at the same time, the variable buckle joint 1-3, the lifting nipple 1-2 and the coupling 1-1 are disassembled, the piston rod 3-2 and the piston 3-20 are controlled to move downwards, and the position of the scale 3-10 is recorded, the setting of the lowermost packer is completed, the rotation transmission sleeve 1-7 drives the radish head 1-10 and the telescopic pipe fixing sleeve 1-11 to rotate downwards, the radish head 1-10 is sealed with the wellhead 7, the slick line is well set on the polished rod after the polished rod is lifted by using the sucker rod elevator, the slick line box is installed, the square card is punched on the polished rod, the pumping unit horse head and the suspension rope device are installed to test pumping, and the setting of the uppermost packer and the lowermost packer is verified.

[0023] It can be understood that the above-mentioned various embodiments of the present application can be combined with each other to form a combined embodiment without violating the principle logic. Due to the limited length, the present application will not be described again.

[0024] Those skilled in the art can understand that in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process, and the specific execution order of each step should be determined according to its function and possible internal logic.

[0025] The wellhead downhole tubing setting device provided by the application can realize the sealing test of each downhole packer by adjusting the carrot head assembly 1 after setting each downhole packer, sealing the carrot head assembly 1 and the wellhead 7, pumping the wellbore crude oil to realize the sealing test of each downhole packer, connecting the carrot head assembly and the two large oil cylinder assemblies 3 through the upper bearing beam assembly 2, making the weight of the whole downhole tubing column act on the upper bearing beam assembly 2, controlling the up-and-down movement of the upper bearing beam assembly 2 through the two large oil cylinder assemblies 3 arranged on the two sides of the upper bearing beam assembly 2, and realizing the sealing of the oil sleeve annulus at any time by the base assembly 4 holding the tubing at the center of the wellhead 7, so as to achieve the purpose of the step-by-step setting and sealing test of the multi-stage packer in the downhole oil-water separation injection-production technology.

[0026] The above has described the embodiments of the application, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or technical improvement in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A downhole tubing pressure setting device, comprising: The application relates to a wellhead adjusting assembly. The wellhead adjusting assembly comprises an upper bearing beam combined assembly (2), two large oil cylinder assemblies (3) and a base assembly (4). The two large oil cylinder assemblies (3) comprise a first large oil cylinder assembly and a second large oil cylinder assembly. The upper bearing beam combined assembly (2) is connected with the wellhead adjusting assembly (1), the wellhead adjusting assembly (1) is pressed against the upper bearing beam combined assembly (2), and the two large oil cylinder assemblies (3) are arranged on the two sides of the upper bearing beam combined assembly (2) respectively. The base assembly (4) is provided with a well mouth (7) at the lower end, the base assembly (4) is connected with the well mouth (7) through a plurality of well mouth bolts (5), the well mouth bolts (5) are fixed by well mouth nuts (6) respectively, the well mouth (7) is provided with a casing head (10) at the lower end, the casing head (10) is connected with the well mouth (7) through a plurality of casing head bolts (8), and the casing head bolts (8) are fixed by casing head nuts (9) respectively.

2. The wellhead tubing-down-set device of claim 1, wherein, The wellhead adjusting assembly (1) comprises a coupling (1-1), a lifting nipple (1-2), a variable buckle connector (1-3), a locking cap (1-4), a lifting pipe (1-5), an adjusting backup cap (1-6), a transmission sleeve (1-7), a plurality of bolts (1-8), a packing (1-9), a wellhead (1-10), a telescopic pipe fixing sleeve (1-11), a telescopic pipe short connection O-shaped ring (1-12), a lifting pipe O-shaped ring (1-13), a telescopic pipe short connection (1-14) and a protective sleeve (1-15). The coupling (1-1) is arranged at the upper end of the lifting nipple (1-2), the upper end of the variable buckle connector (1-3) is connected with the lifting nipple (1-2), the lower end of the variable buckle connector (1-3) is connected with the lifting pipe (1-5), the locking cap (1-4), the adjusting backup cap (1-6), the transmission sleeve (1-7) and the wellhead (1-10) are sequentially sleeved on the lifting pipe (1-5) from top to bottom, the transmission sleeve (1-7) is arranged at the upper end of the wellhead (1-10), the transmission sleeve (1-7) is connected with the wellhead (1-10) through the plurality of bolts (1-8), the lower end of the wellhead (1-10) is connected with the telescopic pipe fixing sleeve (1-11), the lower end of the telescopic pipe fixing sleeve (1-11) is connected with the protective sleeve (1-15), and the lifting pipe (1-5) passes through the inside of the wellhead (1-10) and is connected with the telescopic pipe short connection (1-14). The outer wall of the telescopic pipe short connection (1-14) and the inner wall of the telescopic pipe fixing sleeve (1-11) are provided with ladder threads, and the telescopic pipe fixing sleeve (1-11) can drive the wellhead (1-10) to move axially by rotating. The lifting pipe O-shaped ring (1-13) is arranged between the lifting pipe (1-5) and the telescopic pipe short connection (1-14) and is used for sealing the joint of the lifting pipe (1-5) and the telescopic pipe short connection (1-14), the telescopic pipe short connection (1-14) is sleeved with the telescopic pipe short connection O-shaped ring (1-12) at the upper end, and the telescopic pipe short connection O-shaped ring (1-12) is used for sealing the gap between the telescopic pipe fixing sleeve (1-11) and the telescopic pipe short connection (1-14).

3. The wellhead tubing-down-set device of claim 2, wherein, The upper bearing beam combination assembly (2) comprises two bearing blocks (2-1), two rib plates (2-2), two upper lining plates (2-3), two lifting lugs (2-4), two lower lining plates (2-5), a bearing seat (2-6), a main shaft (2-7), a bearing A (2-8), a bearing B (2-9), a spare cap (2-10), an ear plate (2-11) and an intermediate connecting plate (2-12), the bearing block (2-1) is provided with a circular through hole in the center, the two bearing blocks (2-1) comprise a left bearing block and a right bearing block, the bearing seat (2-6) is sequentially sleeved with the main shaft (2-7), the bearing A (2-8) and the bearing B (2-9) from top to bottom, the main shaft (2-7) is provided with a through hole in the center, and the main shaft (2-7) is symmetrically provided with the bearing block (2-1), the lower lining plate (2-5), the rib plate (2-2), the upper lining plate (2-3) and the lifting lug (2-4) on the left and right sides, the lower lining plate (2-5), the rib plate (2-2), the upper lining plate (2-3) and the lifting lug (2-4) are sequentially arranged on the right side of the left bearing block from bottom to top, and the lower lining plate (2-5), the rib plate (2-2), the upper lining plate (2-3) and the lifting lug (2-4) are welded to the bearing seat (2-6), the spare cap (2-10) is arranged on the upper end of the main shaft (2-7), and the spare cap (2-10) is used for positioning the bearing A (2-8) and the bearing B (2-9); The bearing block (2-1) is provided with an ear plate (2-11) on each of the front and rear sides, the ear plates are connected through the intermediate connecting plate (2-12), the main shaft (2-7) is provided with a through hole in the center, the size of the through hole is matched with the lifting tube (1-5), the upper bearing beam combination assembly (2) is arranged on the adjusting spare cap (1-6), and the upper bearing beam combination assembly (2) is limited by the locking cap (1-4).

4. The wellhead tubing-down-set device of claim 1, wherein, The large oil cylinder assembly (3) comprises a lifting ring (3-1), a piston rod (3-2), a piston rod spare cap (3-3), a scale seat (3-4), an outer clasp spring (3-5), a scale guide sleeve (3-6), a scale guide sleeve bolt (3-7), a scale fixing bolt (3-8), a guide sleeve (3-9), a scale (3-10), a dustproof ring (3-11), a U-shaped ring (3-12), a Hymos ring (3-13), a Stoff (3-14), an upper pipe joint (3-15), a guide sleeve oil inlet channel (3-16), a piston sleeve (3-17), a piston sleeve spare cap (3-18), a piston sleeve locking cap (3-19), a piston (3-20), an O-shaped ring (3-21), a piston Hymos ring (3-22), a piston Glea ring (3-23), a pin (3-24), a cylinder bottom (3-25), a lower pipe joint (3-26) and a cylinder bottom oil inlet channel (3-27). The lower end of the lifting ring (3-1) is provided with a piston rod (3-2), the upper end of the piston rod (3-2) is provided with a piston rod spare cap (3-3), the outer wall of the piston rod (3-2) is provided with a ring type groove, the scale seat (3-4) is sleeved on the piston rod (3-2), the left end of the scale seat (3-4) is arranged in the ring type groove of the piston rod (3-2), the scale seat (3-4) is fixed by an outer snap spring (3-5), the piston rod (3-2) passes through a guide sleeve (3-9) and is inserted into a piston sleeve (3-17), the guide sleeve (3-9) is arranged at the upper end of the piston sleeve (3-17), the guide sleeve (3-9) is threadedly connected with the piston sleeve (3-17), the upper end of the outer wall of the piston sleeve (3-17) is provided with a scale guide sleeve (3-6), the scale guide sleeve (3-6) is fixed on the outer wall of the guide sleeve (3-9) through a scale guide sleeve bolt (3-7), a scale (3-10) passes through the scale seat (3-4) and the scale guide sleeve (3-6) from top to bottom in sequence, the upper end of the scale (3-10) is provided with a through hole, a scale fixing bolt (3-8) passes through the through hole and fixes the scale (3-10) on the scale seat (3-4), and the scale guide sleeve (3-6) is used for supporting the scale (3-10); The guide sleeve (3-9) is in a ring type structure, the inner wall of the guide sleeve (3-9) is sequentially provided with a dustproof ring (3-11), a U-shaped ring (3-12), a hamos ring (3-13) and a steflex (3-14) from top to bottom, the dustproof ring (3-11), the U-shaped ring (3-12), the hamos ring (3-13) and the steflex (3-14) cooperate with the outer surface of the piston rod (3-2) to play a sealing role, the guide sleeve (3-9) is provided with a guide sleeve oil inlet channel (3-16), the outer wall of the left end of the guide sleeve (3-9) is provided with a threaded hole, the threaded hole is in communication with the guide sleeve oil inlet channel (3-16), and the threaded hole is provided with an upper pipe joint (3-15); The outer wall of the piston sleeve (3-17) is sleeved with a piston sleeve spare cap (3-18) and a piston sleeve locking cap (3-19) from top to bottom, the lower end of the piston rod (3-2) is threadedly connected with a piston (3-20), the piston (3-20) is provided with a pin (3-24) at the connection position with the piston rod (3-2), an O-shaped ring (3-21) is arranged between the piston rod (3-2) and the piston (3-20), the O-shaped sealing ring (3-21) seals the gap between the piston rod (3-2) and the piston (3-20), the outer wall of the piston (3-20) is sleeved with a piston hamos ring (3-22) and a piston glee ring (3-23) from top to bottom, the lower end of the piston sleeve (3-17) is provided with a cylinder bottom (3-25), the inner wall of the cylinder bottom (3-25) is provided with a threaded hole, the threaded hole in the inner wall of the cylinder bottom (3-25) is connected with a cylinder bottom oil inlet channel (3-27), and the cylinder bottom oil inlet channel (3-27) is provided with a lower pipe joint (3-26).

5. The wellhead tubing-down-set device of claim 4, wherein, The piston (3-20) is filled with hydraulic oil, the entering and discharging of the hydraulic oil in the piston (3-20) drives the piston (3-20) and the piston rod (3-2) to move in the piston sleeve (3-17), and the piston rod (3-2) drives the upper bearing beam assembly (2) to move up and down.

6. The wellhead tubing-down-set device of claim 1, wherein, The base assembly (4) comprises a plurality of oil cylinder bottom screws (4-1), a plurality of oil cylinder bottom nuts (4-2), two oil cylinder bottoms (4-3), a left piston sleeve (4-4), a left oil cylinder bottom oil inlet channel (4-5), a pipe joint A (4-6), a left piston rod (4-7), a piston rod gasket (4-8), a piston rod guide belt (4-9), a left guide sleeve (4-10), a bearing flange (4-11), a plurality of bearing flange nuts (4-12), a plurality of bearing flange bolts (4-13), a guide sleeve O-ring (4-14), a guide sleeve stuffing box (4-15), a guide sleeve dust seal (4-16), a pipe joint B (4-17), a left guide sleeve oil inlet channel (4-18), a piston rod connecting pin (4-19), a left sealing plate (4-20), an upper sealing plate (4-21), an upper sealing plate bolt (4-22), a right sealing plate (4-23), a right piston rod (4-24), a right guide sleeve (4-25), a pipe joint C (4-26), a right guide sleeve oil inlet channel (4-27), a right piston sleeve (4-28), a pipe joint D (4-29), and a right oil cylinder bottom oil inlet channel (4-30); The two oil cylinder bottoms (4-3) include a left oil cylinder bottom and a right oil cylinder bottom, the left end of the left oil cylinder bottom is provided with a plurality of threaded holes, an oil cylinder bottom screw rod (4-1) is arranged in each threaded hole, the oil cylinder bottom screw rod (4-1) connects the left oil cylinder bottom and a left piston sleeve (4-4), the oil cylinder bottom screw rod (4-1) is positioned by an oil cylinder bottom nut (4-2), the bottom of the left oil cylinder bottom is provided with a threaded hole, a pipe joint A (4-6) is arranged in the threaded hole at the bottom of the left oil cylinder bottom, an oil inlet channel (4-5) is arranged in the left oil cylinder bottom, the oil inlet channel (4-5) is communicated with the threaded hole at the bottom of the left oil cylinder bottom, the right end of the left oil cylinder bottom is provided with the left piston sleeve (4-4), the left piston sleeve (4-4) is provided with a left piston rod (4-7), the left end of the left piston rod (4-7) is sleeved with a piston rod grommet (4-8) and a piston rod guide belt (4-9), the right end of the left piston rod (4-7) is inserted into a left guide sleeve (4-10), a plurality of bearing flange bolts (4-13) pass through a bearing flange (4-11), the left guide sleeve (4-10) and the left piston sleeve (4-4) in sequence and are locked by a bearing flange nut (4-12), three annular grooves are arranged on the inner wall of the left guide sleeve (4-10), a guide sleeve O-shaped ring (4-14), a guide sleeve stator seal (4-15) and a guide sleeve dustproof ring (4-16) are arranged in the three annular grooves respectively, the guide sleeve O-shaped ring (4-14), the guide sleeve stator seal (4-15) and the guide sleeve dustproof ring (4-16) are used for sealing the gap between the left piston rod (4-7) and the left guide sleeve (4-10), the left guide sleeve (4-10) is provided with a left guide sleeve oil inlet channel (4-18), the left guide sleeve oil inlet channel (4-18) is connected with a pipe joint B (4-17), the right end of the left piston rod (4-7) is provided with a slot hole, a threaded hole is arranged in the vertical direction of the slot hole, the left end of a left sealing plate (4-20) is provided with a cylindrical structure, the left end of the left sealing plate (4-20) is inserted into the right end slot hole of the left piston rod (4-7), a piston rod connecting pin (4-19) is arranged in the threaded hole to connect the left sealing plate (4-20) and the left piston rod (4-7); The left sealing plate (4-20) is symmetrically provided with a right sealing plate (4-23), the right end of the right sealing plate (4-23) is provided with a cylindrical structure, the left end of the right piston rod (4-24) is provided with a slot hole, a threaded hole is provided in the vertical direction of the slot hole, the right end of the right sealing plate (4-23) is inserted into the left end slot hole of the right piston rod (4-24), a piston rod connecting pin (4-19) is arranged in the threaded hole, the piston rod connecting pin (4-19) connects the right sealing plate (4-23) and the right piston rod (4-24), the left guide sleeve (4-10) is symmetrically provided with a right guide sleeve (4-25), the left piston sleeve (4-4) is symmetrically provided with a right piston sleeve (4-28), the bearing flange bolts (4-13) pass through the bearing flange (4-11), the right guide sleeve (4-25) and the right piston sleeve (4-28) and are locked by the bearing flange side nut (4-12), the inner wall of the right guide sleeve (4-25) is provided with three annular grooves, the guide sleeve dustproof ring (4-16), the guide sleeve seal (4-15) and the guide sleeve O-ring (4-14) are arranged in the three annular grooves respectively, the guide sleeve dustproof ring (4-16), the guide sleeve seal (4-15) and the guide sleeve O-ring (4-14) are used for sealing the gap between the right piston rod (4-24) and the right guide sleeve (4-25), the right guide sleeve (4-25) is provided with a right guide sleeve oil inlet channel (4-27), the right guide sleeve oil inlet channel (4-27) is connected with a pipe joint C (4-26), the left end of the right piston rod (4-24) is inserted into the right guide sleeve (4-25), the right end of the right piston rod (4-24) is sleeved with a piston rod guide belt (4-9) and a piston rod gasket (4-8), the left oil cylinder bottom is symmetrically provided with a right oil cylinder bottom, the right end of the right piston sleeve (4-28) is provided with a plurality of threaded holes, a plurality of oil cylinder bottom screws (4-1) are sequentially connected with the threaded holes provided at the right end of the right piston sleeve (4-28) through the right oil cylinder bottom, the plurality of oil cylinder bottom screws (4-1) are respectively positioned by oil cylinder bottom nuts (4-2), the right oil cylinder bottom is provided with a right oil cylinder bottom oil inlet channel (4-30), the right oil cylinder bottom is connected with a pipe joint D (4-29).

7. The wellhead tubing-down-set device of claim 6, wherein, The upper surface of the upper sealing plate (4-21) is provided with a plurality of threaded holes, the upper surface of the bearing flange (4-11) is provided with a plurality of threaded holes, the upper sealing plate bolts (4-22) are respectively arranged in the threaded holes, and the upper sealing plate (4-21) and the bearing flange (4-11) are connected through the upper sealing plate bolts (4-22).

8. The wellhead tubing-down-set device of claim 6, wherein, The left sealing plate (4-20) and the right sealing plate (4-23) are connected by a left piston rod (4-7) and a right piston rod (4-24) respectively, the left piston rod (4-7) and the right piston rod (4-24) are axially moved by entering and discharging of hydraulic oil in a left piston sleeve (4-4) and a right piston sleeve (4-28) respectively, thereby driving the left sealing plate (4-20) and the right sealing plate (4-23) to move to the center of the wellhead (7) simultaneously, and the left sealing plate (4-20) and the right sealing plate (4-23) can hold the oil pipe in the center of the wellhead (7) and seal the oil-casing annulus at any time.

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