Double tube slip type oil well head device

Abstract

The present application relates to the field of Christmas tree, disclose a kind of double-tube slip type oil production wellhead device, comprising: base component, base component includes oil pipe, and the oil pipe head of being set outside oil pipe, sealing sleeve, sealing sleeve is arranged in the inside of oil pipe head, sealing sleeve is used to seal the gap between oil pipe and oil pipe head, slip hanger, slip hanger includes the slip seat of being arranged in the inside of oil pipe head, and the slip assembly of being installed in the outside of slip seat, slip hanger is used to fix oil pipe, Christmas tree, Christmas tree is installed in the outside of oil pipe head;By setting slip hanger, can make oil pipe when being blocked, also can be stably suspended installation using slip hanger, will not affect mining progress, and by the cooperation of each component, can improve the stability of oil pipe suspension installation, reduce the damage caused to oil pipe or lead to oil pipe drop-off.

Description

A dual-tube slip type oil wellhead device Technical Field

[0001] This invention relates to the field of wellheads, and in particular to a double-tube slip-type wellhead device. Background Technology

[0002] Oil wellhead equipment is an important component of oil and gas extraction. It is mainly used to suspend tubing, seal the annular space between the casing and tubing, control wellhead pressure and regulate oil (gas) production. When necessary, it can also be used to close the wellhead, inject water, and perform tests.

[0003] Common single-tube wellhead assemblies can only suspend one tubing string for single operations such as extraction or water injection. To achieve multi-functional wellhead operations, such as stratified extraction, simultaneous water injection and production, and simultaneous production and monitoring, a wellhead assembly that can suspend two tubing strings simultaneously and has two independent channels is required; this is commonly known as a dual-tube wellhead assembly.

[0004] Currently, the tubing hanger of the dual-tube oil wellhead device adopts a spindle structure. This method has drawbacks: when the tubing is obstructed during descent, the dual-tube hanger often cannot be properly positioned, which affects the production progress and safety, and causes huge economic losses. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that when the lowering of the tubing is obstructed, the mandrel-type double-tube wellhead device is difficult to be properly seated.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a dual-tube slip-type oil wellhead device, comprising:

[0007] The basic components include an oil pipe and an oil pipe head sleeved on the outside of the oil pipe;

[0008] A sealing sleeve is disposed inside the oil pipe head, and the sealing sleeve is used to seal the gap between the oil pipe and the oil pipe head;

[0009] A slip hanger, comprising a slip seat disposed inside the tubing head and a slip assembly mounted outside the slip seat, the slip hanger being used to secure the tubing;

[0010] A tree, which is installed on the outside of the tubing head, is used to provide an outflow channel for substances in the tubing.

[0011] In a preferred embodiment of the dual-pipe slip-type oil wellhead device of the present invention: the basic component further includes a casing head sleeved on the outside of the oil pipe, and a first fastening pipe clamp disposed on the outside of the casing head and the oil pipe head.

[0012] Two first fastening pipe clamps are provided, and the two first fastening pipe clamps wrap around the outside of the casing head and the tubing head, and the two first fastening pipe clamps are connected by bolts.

[0013] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: the basic component further includes a first support surface disposed inside the tubing head;

[0014] The sealing sleeve includes a support base, a sealing gasket, a pressure ring, a first connecting bolt, a first mating surface, and a sealing bolt;

[0015] The support base is disposed inside the oil pipe head, and the first mating surface is disposed outside the support base, with the first mating surface in contact with the first lifting surface;

[0016] The support base, the sealing gasket, and the pressure ring are stacked sequentially. The support base and the pressure ring are connected by the sealing bolt, which passes through the sealing gasket. The sealing gasket is made of an elastic material.

[0017] The support base, the sealing gasket, and the pressure ring are each provided in pairs. The two support bases are connected by the first connecting bolt. The sealing gasket can seal the gap between the oil pipe and the oil pipe head.

[0018] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: it further includes a limiting component; the limiting component includes a clamping bolt threadedly connected to the inside of the tubing head, a pressure-applying inclined surface disposed at the end of the clamping bolt near the inside of the tubing head, a pressure-receiving inclined surface disposed on the outside of the pressure ring, a positioning groove opened inside the support seat, and a positioning bolt threadedly connected to the inside of the tubing head.

[0019] The pressure-applying inclined surface contacts the pressure-receiving inclined surface, the end of the positioning bolt is disposed inside the positioning groove, and the limiting component is used to limit the position of the sealing sleeve.

[0020] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: the basic component further includes a second support surface disposed inside the tubing head;

[0021] The slip seat includes a slip seat body disposed inside the oil pipe head, a second mating surface disposed outside the slip seat body, a through hole opened inside the slip seat body, a guide slope disposed inside the through hole, a limiting plate fixedly connected to the outside of the slip seat body, and a second connecting bolt disposed inside the slip seat body.

[0022] The second mating surface contacts the second lifting surface;

[0023] The slip body is provided in two parts, and the two slip bodies are connected by the second connecting bolt.

[0024] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: the slip assembly includes slips disposed on the outside of the limiting plate, suspension bolts disposed inside the limiting plate, mating slopes disposed on the outside of the slips, slip teeth opened inside the slips, a cylinder fixedly connected to one side of the slips, and a circular hole opened on the side of the slips away from the cylinder.

[0025] The locking plate is connected to the limiting plate by the suspension bolt, and the mating slope is in contact with the guide slope.

[0026] The four slips are grouped together. Within the same group, between every two adjacent slips, the cylinder of one slip is inserted into the circular hole of the other slip.

[0027] The outer diameter of the cylinder is smaller than the inner diameter of the hole, the height of the cylinder is smaller than the depth of the hole, and each pair of adjacent slips does not contact each other. The slips are used to suspend the oil pipe.

[0028] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: the slip hanger further includes a guide assembly;

[0029] The guide assembly includes a guide groove formed inside the slip body and a guide post fixedly connected to the outside of the slip.

[0030] The guide post is slidably connected inside the guide groove, and the guide assembly is used to prevent the slip from rotating.

[0031] In a preferred embodiment of the dual-tube slip-type oil wellhead device of the present invention: the tree includes a conversion flange disposed on the outside of the tubing head, a second fastening clamp disposed on the outside of the tubing head and the conversion flange, a tree body disposed on the outside of the conversion flange, and a third fastening clamp disposed on the outside of the conversion flange and the tree body.

[0032] Two second fastening pipe clamps are provided, and the two second fastening pipe clamps wrap around the outside of the oil pipe head and the conversion flange, and the two second fastening pipe clamps are connected by bolts;

[0033] The third fastening clamp is provided in two parts, which wrap around the outside of the conversion flange and the tree body, and are connected by bolts.

[0034] The beneficial effects of this invention are as follows: by setting a slip hanger, the oil pipe can be stably suspended and installed even when the descent is obstructed, without affecting the mining progress. Furthermore, through the cooperation of various components, the stability of the oil pipe suspension installation can be improved, reducing the possibility of damage to the oil pipe or the oil pipe falling off. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0036] Figure 1 shows a schematic diagram of the overall structure of the present invention.

[0037] Figure 2 shows a cross-sectional view of the basic components of the present invention.

[0038] Figure 3 shows an enlarged view of part A in Figure 2 of the present invention.

[0039] Figure 4 shows a front view of the sealing sleeve of the present invention.

[0040] Figure 5 shows a side view of the sealing sleeve of the present invention.

[0041] Figure 6 shows a top view of the sealing sleeve after rotating 90° according to the present invention.

[0042] Figure 7 shows a cross-sectional view of the oil well tree of the present invention.

[0043] Figure 8 shows an enlarged view of part B in Figure 7 of the present invention.

[0044] Figure 9 shows a schematic diagram of the inner side of the slip seat of the present invention.

[0045] Figure 10 shows a schematic diagram of the inner side of the KOV assembly of the present invention.

[0046] Figure 11 shows a top view of the KOV assembly of the present invention.

[0047] Figure 12 shows a top view of the slip suspension device of the present invention.

[0048] Figure 13 shows a front view of the slip suspension device of the present invention.

[0049] Figure 14 shows a side view of the slip suspension device of the present invention.

[0050] Figure 15 shows a schematic diagram of the tubing suspension state of the present invention.

[0051] In the diagram: 1. Basic component; 2. Sealing sleeve; 3. Limiting component; 4. Slip hanger; 5. Christmas tree; 11. Tubing; 12. Casing head; 13. Tubing head; 14. First fastening clamp; 15. First lifting surface; 16. Second lifting surface; 21. Support seat; 22. Sealing gasket; 23. Pressure ring; 24. First connecting bolt; 25. First mating surface; 26. Sealing bolt; 31. Tightening bolt; 32. Pressure-applying slope; 33. Pressure-bearing slope; 34. Positioning groove; 35. Positioning bolt; 41. 42. Slip seat; 43. Slip assembly; 411. Guide assembly; 412. Slip seat body; 413. Second mating surface; 414. Through hole; 415. Guide slope; 416. Limiting plate; 417. Second connecting bolt; 421. Slip; 422. Suspension bolt; 423. Mating slope; 424. Slip tooth; 425. Cylindrical rod; 426. Circular hole; 431. Guide groove; 432. Guide post; 51. Conversion flange; 52. Second fastening pipe clamp; 53. Norm body; 54. Third fastening pipe clamp. Detailed Implementation

[0052] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0053] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0054] Referring to Figures 1 to 15, this embodiment provides a dual-pipe slip-type oil wellhead device, including a base component 1. The base component 1 includes an oil pipe 11 and an oil pipe head 13 sleeved on the outside of the oil pipe 11. The oil pipe 11 is configured as two pipes.

[0055] The sealing sleeve 2 is disposed inside the oil pipe head 13 and is used to seal the gap between the oil pipe 11 and the oil pipe head 13.

[0056] The slip hanger 4 includes a slip seat 41 disposed inside the tubing head 13 and a slip assembly 42 installed outside the slip seat 41. The slip hanger 4 is used to fix the tubing 11.

[0057] Tree 5 is installed on the outside of tubing head 13 and is used to provide an outflow channel for the material in tubing 11.

[0058] When in use, the staff first installs the basic component 1. During the installation process, the oil pipe 11 is held in place by the oil pipe clamp and the oil pipe 11 is lowered. After the oil pipe 11 is lowered into place, the position of the oil pipe 11 is adjusted. At this time, the installation of the basic component 1 is completed.

[0059] After the basic component 1 is installed, the sealing sleeve 2 is wrapped around the outside of the oil pipe 11 and then placed into the installation position inside the oil pipe head 13 to complete the installation of the sealing sleeve 2.

[0060] After the sealing sleeve 2 is installed, the slip hanger 4 is wrapped around the outside of the oil pipe 11 and placed inside the oil pipe head 13. After the slip hanger 4 is placed in the installation position inside the oil pipe head 13, the slip assembly 42 is separated from the slip seat 41. At this time, the slip assembly 42 naturally descends under its own weight, and under the cooperation of the slip seat 41, the slip assembly 42 will initially contract and clamp onto the outside of the oil pipe 11. Then, the oil pipe clamp is released from the oil pipe 11, and the oil pipe 11 will naturally descend under its own weight, driving the slip assembly 42 to descend synchronously. During the descent of the slip assembly 42, under the cooperation of the slip seat 41, the slip assembly 42 will further contract and completely clamp the oil pipe 11.

[0061] It should be noted that after the oil pipe clamp is released from the oil pipe 11, the oil pipe 11 will naturally descend a short distance and then be completely locked by the slip assembly 42.

[0062] After the oil pipe 11 is loosened by the oil pipe hanger and the oil pipe 11 is locked by the slip assembly 42, with a certain height of oil pipe 11 remaining at the top, the excess oil pipe 11 at the top of the oil pipe 11 is cut off and the cut at the top of the oil pipe 11 is flattened. At this time, the installation of the slip hanger 4 is completed.

[0063] After installing the slip hanger 4, the tree 5 is installed on the outside of the tubing head 13, thus completing the installation of the tree 5.

[0064] As one embodiment provided by the present invention, as shown in Figures 1 to 3, the base component 1 further includes a casing head 12 sleeved on the outside of the oil pipe 11, and a first fastening pipe clamp 14 disposed on the outside of the casing head 12 and the oil pipe head 13.

[0065] Two first fastening pipe clamps 14 are provided. The two first fastening pipe clamps 14 are wrapped around the outside of the casing head 12 and the oil pipe head 13. The two first fastening pipe clamps 14 are connected by bolts. The inner surface of the first fastening pipe clamp 14 is in contact with the outer surface of the casing head 12 and the oil pipe head 13.

[0066] A sealing ring is provided between the casing head 12 and the tubing head 13.

[0067] During installation, first align the casing head 12 with the wellhead on the ground and place it on the ground. Then align the tubing head 13 with the casing head 12 and place it on top of the casing head 12. Next, wrap the two first fastening pipe clamps 14 around the connection position of the casing head 12 and the tubing head 13, and use bolts to fasten the two first fastening pipe clamps 14. At this time, the connection between the casing head 12 and the tubing head 13 is completed.

[0068] Use tubing clamps to hold tubing 11 and lower it into the wellhead through tubing head 13 and casing head 12. Once tubing 11 is in place, adjust its position to complete the installation of the basic component 1.

[0069] As one embodiment of the present invention, as shown in Figures 1 to 6, the base component 1 further includes a first support surface 15 disposed inside the oil pipe head 13;

[0070] The sealing sleeve 2 includes a support base 21, a sealing gasket 22, a pressure ring 23, a first connecting bolt 24, a first mating surface 25, and a sealing bolt 26;

[0071] The support base 21 is located inside the oil pipe head 13, and the first mating surface 25 is located on the outside of the support base 21. The first mating surface 25 is in contact with the first lifting surface 15.

[0072] The support base 21, the sealing gasket 22 and the pressure ring 23 are stacked in sequence. The support base 21 and the pressure ring 23 are connected by a sealing bolt 26. The sealing bolt 26 passes through the sealing gasket 22. The sealing gasket 22 is made of elastic material.

[0073] Specifically, the sealing gasket 22 is made of rubber.

[0074] Two support bases 21, two sealing gaskets 22 and two pressure rings 23 are provided, and the two support bases 21 are connected by the first connecting bolt 24.

[0075] For ease of description, all support seats 21, sealing gaskets 22 and pressure rings 23 are divided into two groups, with one support seat 21, sealing gasket 22 and pressure ring 23 in each group.

[0076] After the basic component 1 is installed, keep the tubing hanger in the state of clamping the tubing 11.

[0077] At this time, within a set, the support base 21, the sealing gasket 22 and the pressure ring 23 are stacked in sequence, and the support base 21 and the pressure ring 23 are connected by the sealing bolt 26. During this process, the sealing bolt 26 will pass through the sealing gasket 22, thereby completing the installation of this set of structures.

[0078] In another set, the support base 21, sealing gasket 22 and pressure ring 23 are stacked in sequence, and the support base 21 and pressure ring 23 are connected by sealing bolts 26. During this process, the sealing bolts 26 will pass through the sealing gasket 22, thereby completing the installation of this set of structures.

[0079] Two sets of support seats 21, sealing gaskets 22 and pressure rings 23 are wrapped around the outside of the oil pipe 11, and the two sets of support seats 21 are connected and fastened using the first connecting bolt 24.

[0080] Then, the sealing sleeve 2 is slid into the inside of the oil pipe head 13 along the outside of the oil pipe 11 until the first supporting surface 15 inside the oil pipe head 13 contacts the first mating surface 25 of the support seat 21. At this time, under the combined action of the first supporting surface 15 and the first mating surface 25, the support seat 21 is supported by the oil pipe head 13 and cannot continue to descend. At this time, the support seat 21 has been installed in place.

[0081] It should be noted that during the process of sliding the sealing sleeve 2 along the outside of the oil pipe 11 into the oil pipe head 13, in order to prevent the sealing gasket 22 from having excessive friction with the outer wall of the oil pipe 11 and the inner wall of the oil pipe head 13, which would make it difficult for the sealing sleeve 2 to continue to be lowered, the sealing bolt 26 can be connected to the support seat 21 and the pressure ring 23 without being overtightened. This will prevent the pressure ring 23 from excessively squeezing the sealing gasket 22, that is, the sealing gasket 22 will not undergo excessive deformation, thereby reducing the friction between the sealing gasket 22 and the outer wall of the oil pipe 11 and the inner wall of the oil pipe head 13. This will allow the sealing sleeve 2 to be easily slid along the outside of the oil pipe 11 into the oil pipe head 13.

[0082] After the sealing sleeve 2 is slid into the oil pipe head 13 along the outside of the oil pipe 11, the sealing bolt 26 is tightened further, so that the pressure ring 23 is closer to the support seat 21, that is, the pressure ring 23 further squeezes the sealing gasket 22, so that the sealing gasket 22 is further deformed until the sealing gasket 22 completely seals the gap between the oil pipe 11 and the oil pipe head 13, then the tightening of the sealing bolt 26 can be stopped.

[0083] In summary, by setting the sealing sleeve 2, the leakage of oil, gas and other substances in the wellhead along the gap between the tubing 11 and the tubing head 13 can be effectively reduced, thereby improving the overall sealing performance and reducing energy waste.

[0084] As one embodiment of the present invention, as shown in Figures 1 to 6, the present invention further includes a limiting component 3; the limiting component 3 includes a clamping bolt 31 threadedly connected to the inside of the oil pipe head 13, a pressure-applying inclined surface 32 disposed at the end of the clamping bolt 31 near the inside of the oil pipe head 13, a pressure-receiving inclined surface 33 disposed on the outside of the pressure ring 23, a positioning groove 34 opened inside the support seat 21, and a positioning bolt 35 threadedly connected to the inside of the oil pipe head 13;

[0085] The pressure-applying inclined surface 32 contacts the pressure-receiving inclined surface 33, and the end of the positioning bolt 35 is located inside the positioning groove 34.

[0086] During installation, before installing the sealing sleeve 2 inside the oil pipe head 13, the positioning bolt 35 should be screwed into the oil pipe head 13 first. Then, the sealing sleeve 2 is slid into the oil pipe head 13 along the outside of the oil pipe 11. During this process, as the sealing sleeve 2 gradually slides downward inside the oil pipe head 13, the front end of the positioning bolt 35 will gradually engage in the positioning groove 34 inside the support seat 21, thereby ensuring that the sealing sleeve 2 is in a fixed position after being installed inside the oil pipe head 13, that is, the sealing sleeve 2 will not rotate.

[0087] As shown in Figure 3, after the sealing sleeve 2 is installed inside the oil pipe head 13, the clamping bolt 31 is screwed into the oil pipe head 13. During the screwing process, the pressure-applying inclined surface 32 at the front end of the clamping bolt 31 will gradually come into contact with the pressure-receiving inclined surface 33. During the further tightening of the clamping bolt 31, the pressure-applying inclined surface 32 will gradually squeeze the pressure-receiving inclined surface 33. Thus, with the cooperation of the pressure-applying inclined surface 32 and the pressure-receiving inclined surface 33, the clamping bolt 31 can press the pressure ring 23 down tightly, thereby ensuring that the sealing sleeve 2 will not move upward. In addition, due to the combined action of the first supporting surface 15 and the first mating surface 25, the sealing sleeve 2 will not move downward. Therefore, the sealing sleeve 2 is axially limited.

[0088] In summary, by setting the limiting component 3, the sealing sleeve 2 can be further limited, thereby ensuring that the sealing sleeve 2 will not move, and thus ensuring that the sealing effect of the entire device will not be affected by the movement of the sealing sleeve 2. In addition, the stable sealing sleeve 2 can also ensure that the oil pipe 11 will not be offset, rotated, or damaged due to the movement of the sealing sleeve 2.

[0089] As one embodiment of the present invention, as shown in Figures 1-3 and 7-15, the base component 1 further includes a second support surface 16 disposed inside the oil pipe head 13;

[0090] The slip seat 41 includes a slip seat body 411 disposed inside the oil pipe head 13, a second mating surface 412 disposed outside the slip seat body 411, a through hole 413 opened inside the slip seat body 411, a guide slope 414 disposed inside the through hole 413, a limiting plate 415 fixedly connected to the outside of the slip seat body 411, and a second connecting bolt 416 disposed inside the slip seat body 411.

[0091] The second mating surface 412 contacts the second lifting surface 16;

[0092] Two clamping body bodies 411 are provided, and the two clamping body bodies 411 are connected by a second connecting bolt 416.

[0093] After the sealing sleeve 2 and the limiting component 3 are installed, the oil pipe hanger is kept in the state of clamping the oil pipe 11.

[0094] During installation, the two slip body bodies 411 are wrapped around the outside of the oil pipe 11, so that the oil pipe 11 is located inside the through hole 413, and then the two slip body bodies 411 are connected by the second connecting bolt 416.

[0095] After the two slip bodies 411 are connected, the slip 41 is slid along the outside of the oil pipe 11 and inserted into the inside of the oil pipe head 13.

[0096] As the slip seat 41 enters the oil pipe head 13, as the slip seat 41 gradually descends, the second mating surface 412 of the slip seat body 411 gradually approaches and contacts the second supporting surface 16 of the oil pipe head 13. Under the combined action of the second supporting surface 16 and the second mating surface 412, the second supporting surface 16 will support the slip seat body 411, thereby preventing the slip seat 41 from continuing to descend.

[0097] As one embodiment provided by the present invention, as shown in Figures 1-3 and 7-15, the slip assembly 42 includes a slip 421 disposed on the outside of the limiting plate 415, a suspension bolt 422 disposed inside the limiting plate 415, a mating slope 423 disposed on the outside of the slip 421, a slip tooth 424 opened inside the slip 421, a cylinder 425 fixedly connected to one side of the slip 421, and a circular hole 426 opened on the side of the slip 421 away from the cylinder 425;

[0098] The locking plate 421 is connected to the limiting plate 415 by the suspension bolt 422, and the mating slope 423 contacts the guide slope 414.

[0099] Four clips 421 are grouped together. Within the same group, between every two adjacent clips 421, the cylinder 425 of one clip 421 is inserted into the round hole 426 of the other clip 421.

[0100] Each limit plate 415 is equipped with two clips 421;

[0101] The outer diameter of cylinder 425 is smaller than the inner diameter of circular hole 426, the height of cylinder 425 is smaller than the depth of circular hole 426, and no two adjacent slips 421 are in contact with each other.

[0102] When installing the clamp seat 41, since the clamp seat body 411 is fixedly connected to the limiting plate 415, and the limiting plate 415 is connected to the clamp 421 by the suspension bolt 422, when two clamp seat bodies 411 are connected to each other, the clamp seat body 411 will drive the clamp 421 to move closer to each other through the limiting plate 415 and the suspension bolt 422, so that the four clamps 421 are assembled. The assembled state is shown in Figure 11.

[0103] After the two slip body bodies 411 are connected and the slip 41 is slid into the oil pipe head 13 along the outside of the oil pipe 11, unscrew all the suspension bolts 422. At this time, the slip 421 will naturally descend under the action of gravity and separate from the limit plate 415.

[0104] During the descent of the slip 421, under the combined action of the guide slope 414 and the mating slope 423, the four slips 421 in the same group will approach each other and contract, so that the slips 421 will gradually come into contact with the oil pipe 11 and be squeezed, thereby increasing the friction between the slips 421 and the oil pipe 11.

[0105] It should be noted that the height of the cylinder 425 is less than the depth of the circular hole 426, and no two adjacent slips 421 contact each other. Therefore, during the process of the four slips 421 approaching and retracting, the cylinder 425 of one of the two adjacent slips 421 will further insert into the depth of the circular hole 426 of the other slip. Since the outer diameter of the cylinder 425 is smaller than the inner diameter of the circular hole 426, it can be ensured that the process of the four slips 421 approaching and retracting can proceed smoothly without jamming.

[0106] After the slip 421 descends naturally due to gravity and squeezes the oil pipe 11, the oil pipe hanger releases the oil pipe 11. The oil pipe 11 will gradually descend under gravity, and under the action of friction between the slip 421 and the oil pipe 11, the oil pipe 11 will drive the slip 421 to descend. Under the combined action of the guide slope 414 and the mating slope 423, the four slips 421 will further contract, thereby causing the slips 421 to further contract and squeeze the oil pipe 11, so that the slip teeth 424 bite into the outer surface of the oil pipe 11, thus completing the suspension installation of the oil pipe 11.

[0107] After the suspension installation of the oil pipe 11 is completed, with a certain height of oil pipe 11 remaining at the top, the excess oil pipe 11 at the top of the oil pipe 11 is cut off, and the cut at the top of the oil pipe 11 is cut flat. At this point, the installation of the slip hanger 4 is completed.

[0108] It should be noted that when the tubing 11 is lowered by the tubing hanger, if the lowering of the tubing 11 is obstructed, the lowering can be stopped, and the tubing 11 can be slightly raised. After leaving enough distance for the tubing 11 to descend freely under gravity and be securely connected to the slip 421, the tubing 11 can be directly suspended and installed using the slip hanger 4. This avoids the situation in the mandrel-type dual-tube wellhead device where the dual-tube hanger cannot be properly positioned when the lowering of the tubing 11 is obstructed, which would affect the production progress and safety and cause huge economic losses.

[0109] It should be noted that under the action of gravity, the deeper the oil pipe 11 descends, the deeper the slip 421 will descend with the oil pipe 11. Under the combined action of the guide slope 414 and the mating slope 423, the deeper the slip teeth 424 engage with the oil pipe 11, the tighter the oil pipe 11 is fixed, thereby ensuring the stability of the oil pipe 11 suspension installation.

[0110] In addition, to ensure that the slip 421 can descend when the oil pipe 11 begins to descend, the surface of the slip tooth 424 can be roughened to enhance the friction between the slip tooth 424 and the oil pipe 11. Alternatively, the guide slope 414 and the mating slope 423 can be made smooth planes, and lubricating oil can be applied between the guide slope 414 and the mating slope 423 to reduce the friction between the slip 421 and the slip seat body 411. If necessary, manual intervention can also be performed. For example, the operator can use a wrench, iron sheet, or other tools to press down on the slip 421 through the gap between the oil pipe 11 and the limiting plate 415, so that the slip 421 directly engages with the outer surface of the oil pipe 11, and then release the oil pipe clamp to ensure that the oil pipe 11 can drive the slip 421 to descend.

[0111] In summary, by setting the limiting plate 415, when the slip seat 41 is slidably inserted into the oil pipe head 13 along the outside of the oil pipe 11, the limiting plate 415 can press down the slip 421, so that the slip 421 descends synchronously, preventing the slip 421 from hanging on the outer surface of the oil pipe 11 due to the friction between the slip 421 and the oil pipe 11 when it moves to the middle.

[0112] By setting the cylinder 425 and the round hole 426, the degree of synchronous descent of the four slips 421 can be improved. This is because it is difficult for workers to simultaneously remove multiple suspension bolts 422. Without the cylinder 425 and the round hole 426, after removing the suspension bolt 422 of one slip 421, that slip 421 will descend first, while the other slips 421 will have to wait for the removal of their corresponding suspension bolts 422 before they can descend. The slip 421 that descends first may push the oil pipe 11 to the opposite side. In this situation, the other slips... If the slip 421 fails to descend to the same depth as the slip 421 that descends first, the first slip 421 will have a greater engagement with the oil pipe 11 than the other slips 421. This situation will prevent the oil pipe 11 from receiving a uniform engagement force, thereby increasing the risk of damage to the oil pipe 11. At the same time, it will increase the uneven force on the oil pipe 11. The suspension of the oil pipe 11 will become overly dependent on the first slip 421 that descends first, causing the other slips 421 to be unable to provide a stable engagement force, or even to engage with the oil pipe 11, thus leading to the risk of detachment.

[0113] In addition, even if multiple suspension bolts 422 can be removed at the same time, the cylindrical 425 and the circular hole 426 can prevent one or several slips 421 from being lowered into place while the remaining slips 421 are suspended on the outer surface of the oil pipe 11 due to the friction between the slips 421 and the oil pipe 11.

[0114] As one embodiment of the present invention, as shown in Figures 1-3 and 7-15, the slip hanger 4 further includes a guide assembly 43;

[0115] The guide assembly 43 includes a guide groove 431 formed inside the slip body 411, and a guide post 432 fixedly connected to the outside of the slip 421.

[0116] The guide post 432 is slidably connected inside the guide groove 431.

[0117] After removing the suspension bolt 422, during the descent of the slip 421, the slip 421 will drive the guide column 432 to descend synchronously. Since the guide column 432 is slidably connected inside the guide groove 431, the slip 421 will not rotate while descending.

[0118] If the slip 421 rotates, multiple slips 421 will move closer to each other, causing the distance between two adjacent slips 421 to become too far, resulting in the corresponding cylinder 425 and the hole 426 becoming detached from each other.

[0119] Furthermore, if the slip 421 rotates, it will cause uneven clamping force of the four slips 421 on the oil pipe 11, thereby increasing the risk of damage and detachment of the oil pipe 11.

[0120] By setting the guide component 43, the slip 421 can be prevented from rotating, thereby ensuring that the slip 421 plays a role in the suspension stability of the oil pipe 11.

[0121] In summary, by setting up the slip hanger 4, the oil pipe 11 can be stably suspended and installed even when its descent is obstructed, without affecting the mining progress. Furthermore, through the cooperation of various components, the stability of the oil pipe 11 suspension installation can be improved, reducing the possibility of damage to the oil pipe 11 or the possibility of the oil pipe 11 falling off.

[0122] As one embodiment provided by the present invention, as shown in Figures 1, 2 and 7, the tree 5 includes a conversion flange 51 disposed outside the tubing head 13, a second fastening clamp 52 disposed outside the tubing head 13 and the conversion flange 51, a tree body 53 disposed outside the conversion flange 51, and a third fastening clamp 54 disposed outside the conversion flange 51 and the tree body 53.

[0123] Two second fastening pipe clamps 52 are provided. The two second fastening pipe clamps 52 are wrapped around the outside of the oil pipe head 13 and the conversion flange 51. The two second fastening pipe clamps 52 are connected by bolts.

[0124] Two third fastening pipe clamps 54 are provided. The two third fastening pipe clamps 54 are wrapped around the outside of the conversion flange 51 and the oil well body 53. The two third fastening pipe clamps 54 are connected by bolts.

[0125] A sealing ring is provided between the tubing head 13 and the conversion flange 51, and a sealing ring is provided between the conversion flange 51 and the tree body 53. Channels are provided inside the conversion flange 51 and the tree body 53.

[0126] After completing the installation of the slip hanger 4, insert the oil pipe 11 into the channel of the conversion flange 51 and place the conversion flange 51 on top of the oil pipe head 13. Then, wrap the two second fastening pipe clamps 52 around the connection position of the conversion flange 51 and the oil pipe head 13, and use bolts to fasten the two second fastening pipe clamps 52. At this time, the connection between the conversion flange 51 and the oil pipe head 13 is completed.

[0127] Align the channels inside the conversion flange 51 with the channels inside the tree body 53, place the tree body 53 on top of the conversion flange 51, then wrap two third fastening pipe clamps 54 around the connection position between the tree body 53 and the conversion flange 51, and fasten the two third fastening pipe clamps 54 with bolts. At this point, the connection between the conversion flange 51 and the tree body 53 is completed.

[0128] The material inside the oil pipe 11 flows into the channel opened inside the conversion flange 51 and the tree body 53 through the oil pipe 11, and is discharged through the valve on the tree body 53 that is connected to the channel, thereby completing the collection work.

[0129] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A double-tube slip-type oil wellhead device, characterized in that: The system includes: a base component (1), which includes an oil pipe (11) and an oil pipe head (13) sleeved on the outside of the oil pipe (11); a sealing sleeve (2), which is disposed inside the oil pipe head (13) and is used to seal the gap between the oil pipe (11) and the oil pipe head (13); a slip hanger (4), which includes a slip seat (41) disposed inside the oil pipe head (13) and a slip assembly (42) installed on the outside of the slip seat (41) and is used to fix the oil pipe (11); and a treehouse (5), which is installed outside the oil pipe head (13). On the side, the wellhead (5) is used to provide an outflow channel for the material in the tubing (11); the base component (1) also includes a second support surface (16) disposed inside the tubing head (13); the slip seat (41) includes a slip seat body (411) disposed inside the tubing head (13), a second mating surface (412) disposed outside the slip seat body (411), a through hole (413) opened inside the slip seat body (411), a guide slope (414) disposed inside the through hole (413), a limiting plate (415) fixedly connected to the outside of the slip seat body (411), and a second connecting screw disposed inside the slip seat body (411). Bolt (416); the second mating surface (412) contacts the second supporting surface (16); the slip seat body (411) is configured as two, and the two slip seat bodies (411) are connected by the second connecting bolt (416); the slip assembly (42) includes a slip (421) disposed on the outside of the limiting plate (415), a suspension bolt (422) disposed inside the limiting plate (415), a mating slope (423) disposed on the outside of the slip (421), a slip tooth (424) opened inside the slip (421), a cylinder (425) fixedly connected to one side of the slip (421), and a part opened on the slip (421) away from the cylinder. (425) A circular hole (426) on one side; the slip (421) and the limiting plate (415) are connected by the suspension bolt (422), and the mating slope (423) is in contact with the guide slope (414); four slips (421) are in a group, and in the same group, between every two adjacent slips (421), the cylinder (425) of one slip (421) is inserted into the circular hole (426) of another slip (421); the outer diameter of the cylinder (425) is smaller than the inner diameter of the circular hole (426), the height of the cylinder (425) is smaller than the depth of the circular hole (426), and every two adjacent slips (421) do not contact each other.

2. The dual-tube slip-type oil wellhead device according to claim 1, characterized in that: The basic component (1) also includes a casing head (12) sleeved on the outside of the oil pipe (11), and a first fastening clamp (14) disposed on the outside of the casing head (12) and the oil pipe head (13); the first fastening clamp (14) is configured as two, the two first fastening clamps (14) are wrapped around the outside of the casing head (12) and the oil pipe head (13), and the two first fastening clamps (14) are connected by bolts.

3. The dual-tube slip-type oil wellhead device according to claim 2, characterized in that: The basic component (1) further includes a first support surface (15) disposed inside the oil pipe head (13); the sealing sleeve (2) includes a support base (21), a sealing gasket (22), a pressure ring (23), a first connecting bolt (24), a first mating surface (25), and a sealing bolt (26); the support base (21) is disposed inside the oil pipe head (13), the first mating surface (25) is disposed outside the support base (21), and the first mating surface (25) contacts the first support surface (15); the support base (21), the sealing gasket (22), and the pressure ring (23) are stacked sequentially, the support base (21) and the pressure ring (23) are connected by the sealing bolt (26), the sealing bolt (26) penetrates the sealing gasket (22), and the sealing gasket (22) is made of elastic material; the support base (21), the sealing gasket (22), and the pressure ring (23) are each configured as two, and the two support bases (21) are connected by the first connecting bolt (24).

4. The dual-tube slip-type oil wellhead device according to claim 3, characterized in that: It also includes a limiting component (3); the limiting component (3) includes a clamping bolt (31) threadedly connected inside the oil pipe head (13), a pressure-applying inclined surface (32) located at the end of the clamping bolt (31) near the inside of the oil pipe head (13), a pressure-receiving inclined surface (33) located outside the pressure ring (23), a positioning groove (34) opened inside the support seat (21), and a positioning bolt (35) threadedly connected inside the oil pipe head (13); the pressure-applying inclined surface (32) contacts the pressure-receiving inclined surface (33), and the end of the positioning bolt (35) is located inside the positioning groove (34).

5. A dual-tube slip-type oil wellhead device according to claim 4, characterized in that: The slip hanger (4) further includes a guide assembly (43); the guide assembly (43) includes a guide groove (431) formed inside the slip seat body (411) and a guide post (432) fixedly connected to the outside of the slip (421); the guide post (432) is slidably connected inside the guide groove (431).

6. The dual-tube slip-type oil wellhead device according to claim 5, characterized in that: The tree (5) includes a conversion flange (51) disposed outside the tubing head (13), a second fastening clamp (52) disposed outside the tubing head (13) and the conversion flange (51), a tree body (53) disposed outside the conversion flange (51), and a third fastening clamp (54) disposed outside the conversion flange (51) and the tree body (53); there are two second fastening clamps (52), which wrap around the tubing head (13) and the conversion flange (51) and are connected by bolts; there are two third fastening clamps (54), which wrap around the conversion flange (51) and the tree body (53) and are connected by bolts.

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