Underwater deep-layer oil production device and method

Abstract

The invention discloses an underwater deep-layer oil production device in the technical field of connecting an oil production pipeline with an underwater wellhead, comprising a main pipe: a trigger ring, a valve seat and a valve core, wherein the outer ring of the valve core and the inner ring of the valve seat are both provided with chamfers that match each other; fasteners are arranged in a circular array in the main pipe; a rubber ring for connecting the fasteners; a tightening angle for bringing the fasteners closer together; a limit ring for limiting the maximum height of the fasteners falling; a drive ring fixed to the bottom of the valve seat; a synchronous slide rod slidably arranged in the trigger ring, and both ends pass through the trigger ring; a clamp structure for fixing the limit ring; in the present invention, when the main pipe and the internal structure are installed on the wellhead device, they can play a role in preventing blowout, and after the connecting pipe is inserted, the connecting pipe is pushed outward by pressure, the fasteners are tightened, the clamping of the connecting pipe is reinforced, the connection strength of the connecting pipe is reasonably controlled, rapid installation is achieved, and the time consumed in installation is reduced, thereby ensuring the safety of construction personnel and the cost of mining.

Description

Technical Field

[0001] The invention relates to the technical field of connecting oil production pipelines and wellheads, and in particular to an underwater deep-layer oil production device and a method thereof. Background Art

[0002] As terrestrial oil resources become increasingly depleted, global oil companies have turned their attention to the vast ocean, especially deep-sea areas, which are rich in oil resources.

[0003] The connection between the production pipelines on the ground and the platform and the wellhead devices is through flanges or clamps, which require workers to install manually using tools. However, due to the special working environment of the deepwater underwater production system (water depth exceeds 400m), personnel need to wear professional equipment and go underwater for a long time to perform high-pressure installation operations. The safety of personnel is difficult to guarantee, and the time required is also very long, which greatly increases the cost of oil extraction. Summary of the invention

[0004] The technical problem of the present invention is to provide an underwater deep-layer oil production device and a method thereof. In the present invention, when the main pipe and the internal structure are installed on the wellhead device, they can play a role in preventing blowout. After the connecting pipe is inserted, the connecting pipe is pushed outward by pressure, the fastener is tightened, the clamping of the connecting pipe is strengthened, the connection strength of the connecting pipe is reasonably controlled, and rapid installation is achieved, reducing the time consumed in installation, thereby ensuring the safety of construction personnel and mining costs.

[0005] To achieve the above object, the present invention provides the following technical solution: an underwater deep-layer oil production device, comprising a main pipe,

[0006] A trigger ring, a valve seat and a valve core, wherein the trigger ring, the valve seat and the valve core are sequentially sleeved in the main pipe from the outside to the inside, and the outer ring of the valve core and the inner ring of the valve seat are both provided with chamfers that match each other; a lower valve stem and an upper valve stem are respectively fixed at the bottom of the valve seat and the valve core, and a pressure ring is fixed at the upper valve stem and the lower valve stem;

[0007] The limit structure is used to limit the descent of the valve seat and the rise of the valve core;

[0008] The fasteners are arranged in a circumferential array within the main pipe;

[0009] A rubber ring, used for connecting the fastener and slidably arranged with the main pipe;

[0010] The tightening angle is set in the main pipe to bring the fasteners closer;

[0011] The limit ring is used to limit the lowering limit height of the fastener, and the outer side is inclined;

[0012] The driving ring is fixedly arranged at the bottom of the valve seat and is inclined at the outer side;

[0013] A synchronous slide bar is slidably arranged in the trigger ring, and both ends thereof penetrate the trigger ring;

[0014] The clamp structure is used to fix the limiting ring;

[0015] The limiting structure comprises:

[0016] The sleeve is rotatably arranged with the main pipe, and a switching groove is opened on the side wall;

[0017] The lifting ring is slidably arranged with the sleeve, and a switching key interactively arranged with the switching groove is fixedly arranged on the inner wall;

[0018] A limit spring is located between the lifting ring and the main pipe and is used to reset the lifting ring;

[0019] The upper limit piece is fixed with the sleeve and located above the pressing ring, and is used for limiting the upward movement of the pressing ring;

[0020] The lower limit piece is fixed to the main pipe and is located below the pressure ring to limit the descent of the pressure ring.

[0021] As a further solution of the present invention, the clamp structure comprises:

[0022] A clamp, used for fixing the limiting ring;

[0023] The seesaw is rotatably arranged with the main pipe and fixed to the limit ring by a clamp;

[0024] A spring plate is fixed on the seesaw;

[0025] The wedge block is fixedly arranged at the bottom of the trigger ring, and controls the clamping member to release the fixation of the limit ring by driving the bottom of the seesaw to move.

[0026] As a further solution of the present invention, it also includes:

[0027] The connecting pipe has a mounting port at the bottom and an outer diameter that is the same as that of the trigger ring;

[0028] The limiting plate is plugged into the mounting opening;

[0029] An upper sliding sleeve and a lower sliding sleeve, wherein the upper sliding sleeve and the lower sliding sleeve are respectively fixed to the connecting pipe and the limiting plate;

[0030] The return spring is fixed between the connecting pipe and the limiting plate.

[0031] As a further solution of the present invention, a top plate is arranged on the top of the main pipe, and there is a gap between the top plate and the rubber ring.

[0032] As a further solution of the present invention, a stop piece is fixedly provided on the outer side wall of the limiting ring, and the stop piece is made of rubber.

[0033] As a further solution of the present invention, the synchronous slide rod includes a guide rod, both ends of the guide rod are provided with chamfers matching the inclined surfaces of the limiting ring and the driving ring, and a synchronous spring is fixed between the guide rod and the trigger ring.

[0034] As a further solution of the present invention, the inner side of the fastener is a rough surface, which is used to increase the friction between the fastener and the connecting pipe.

[0035] An underwater deep-layer oil production method, the specific steps are as follows:

[0036] Step 1: Connect the main pipe to the wellhead device in advance, and the trigger ring, valve seat and valve core top form a complete top, which can prevent seawater from entering the wellhead, resulting in a large amount of seawater in the initial stage of oil production, affecting the quality of crude oil and increasing processing costs;

[0037] Step 2: The valve seat is slightly raised by the crude oil pressure, and the valve seat drives the limit ring to rise synchronously through the synchronous slide rod, shortening the limit distance of the fastener descent, controlling the insertion depth of the connecting pipe, and reasonably controlling the depth of the connecting pipe to reduce the difficulty of disassembling the connecting pipe;

[0038] Step 3: The connecting pipe contacts the trigger ring and is inserted into the main pipe. The trigger ring is squeezed and drives the synchronous slide bar to descend. In the initial stage of the synchronous slide bar's descent, the limit ring is still supported by sliding. The trigger ring fixes the limit ring through the clamp structure to prevent the limit ring from descending, thereby changing the insertion depth of the connecting pipe and affecting the connection reliability of the connecting pipe.

[0039] Step 4: The trigger ring presses down the limit structure, so that the limit structure changes the limit on the valve seat and valve core from limiting the descent of the valve seat and the rise of the valve core to limiting the up and down movement of the valve seat, and no longer limits the valve core;

[0040] Step 5: The connecting pipe is slightly raised by the crude oil pressure, and the connecting pipe drives the fasteners to rise. The fasteners are moved closer to each other due to the tightening angle, thereby achieving the tightening of the connecting pipe. The tightening degree of the connecting pipe is proportional to the crude oil pressure, which can ensure the connection reliability of the connecting pipe;

[0041] Step 6: After the installation is completed, start to produce oil. When the donkey head rises, the pressure on the top of the connecting pipe decreases, the valve core rises, and the crude oil flows through the gap between the valve seat and the valve core. Conversely, the valve core drops and fits the valve seat again to avoid crude oil backflow and affect the crude oil production speed.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] In the present invention, after the connecting pipe is lowered to the limit position, it is slightly increased by the crude oil pressure. The connecting pipe drives the fastener to rise through friction, and the fastener compresses the rubber ring to increase the seal between the rubber ring and the connecting pipe. The fasteners are moved closer to each other due to the tightening angle, and the pressure and friction between the tightening angle and the connecting pipe are increased, so that the connecting pipe is tightened. The tightening degree of the connecting pipe is proportional to the crude oil pressure, which can achieve rapid installation of the connecting pipe and reliable connection. At the same time, after the crude oil extraction is completed, the connection strength of the friction connecting pipe can be reduced, and the difficulty of disassembly can be reduced.

[0044] In the present invention, before the wellhead device is connected to the pipeline, the rising distance of the valve seat is controlled by the pressure of crude oil, and the pressure and friction between the valve seat and the valve core are controlled. The valve seat and the valve core play the role of a blowout preventer to avoid crude oil leakage and affect the ecological environment. The rising distance of the valve seat is used to control the displacement of the synchronous slide rod at a fixed height, so that the limit ring and the valve seat rise synchronously, shortening the maximum height of the fastener descent, and then being able to clamp the connecting pipe more quickly through the fastener, and controlling the insertion depth of the connecting pipe. Under the condition of ensuring that crude oil does not leak, the depth of the connecting pipe can be reasonably controlled to reduce the difficulty of disassembling the connecting pipe.

[0045] In the present invention, before the wellhead device is connected to the pipeline, the limit structure limits the valve seat from descending and the valve core from rising, and the outer ring of the valve core and the inner ring of the valve seat are both provided with chamfers that match each other. Combined with the drawings in the specification, when the main pipe is connected to the wellhead device, crude oil is poured into the main pipe, the valve seat is subjected to an upward thrust, and the extrusion pressure between the chamfers of the valve seat and the valve core increases accordingly. The greater the crude oil pressure, the tighter the chamfers of the valve seat and the valve core fit each other, thereby avoiding crude oil leakage, causing environmental pollution and waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0047] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0049] Figure 3 It is a schematic diagram of the cross-sectional structure of the main pipe and its connection relationship of the present invention;

[0050] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0051] Figure 5 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0052] Figure 6 This is a schematic diagram of the lifting ring and its connection relationship structure of the present invention;

[0053] Figure 7 It is a schematic diagram of the cross-sectional structure of the sleeve and its connection relationship of the present invention;

[0054] Figure 8 It is a schematic diagram of the fastener and its connection relationship structure of the present invention;

[0055] Fig. 9 It is a schematic diagram of the structure of the stopper and its connection relationship of the present invention;

[0056] Fig.10 It is a schematic diagram of the process of the present invention;

[0057] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0058] 1. Main pipe; 11. Trigger ring; 12. Valve seat; 13. Valve core; 14. Upper valve stem; 15. Lower valve stem; 16. Press ring; 21. Sleeve; 22. Switching groove; 23. Lifting ring; 24. Switching key; 25. Limit spring; 26. Upper limit piece; 27. Lower limit piece; 31. Fastener; 32. Rubber ring; 33. Tightening angle; 34. Limit ring; 35. Drive ring; 36. Stop piece; 4. Synchronous slide rod; 41. Guide rod; 42. Synchronous spring; 51. Clamp; 52. Rocker; 53. Spring plate; 54. Wedge block; 61. Connecting pipe; 62. Mounting port; 63. Limit plate; 64. Upper sliding sleeve; 65. Lower sliding sleeve; 66. Reset spring; 7. Top plate. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] See also Figure 1-10 The present invention provides a technical solution: an underwater deep-layer oil production device, comprising a main pipe 1:

[0061] A trigger ring 11, a valve seat 12 and a valve core 13, wherein the trigger ring 11, the valve seat 12 and the valve core 13 are sequentially sleeved in the main pipe 1 from the outside to the inside, and the outer ring of the valve core 13 and the inner ring of the valve seat 12 are both provided with chamfers that match each other;

[0062] Since the limit structure limits the valve seat 12 to fall and the valve core 13 to rise, the outer ring of the valve core 13 and the inner ring of the valve seat 12 are both provided with chamfers that match each other. Figure 3 When the main pipe 1 is connected to the wellhead device, crude oil is poured into the main pipe 1, and the valve seat 12 is pushed upward, and the extrusion pressure between the valve seat 12 and the valve core 13 increases accordingly. The greater the crude oil pressure, the tighter the chamfers of the valve seat 12 and the valve core 13 fit each other, thereby avoiding crude oil leakage, environmental pollution and waste of resources;

[0063] A limiting structure, used to limit the descent of the valve seat 12 and the rise of the valve core 13;

[0064] The fasteners 31 are arranged in a circumferential array inside the main pipe 1;

[0065] The rubber ring 32 is used to connect the fastener 31 and is slidably arranged with the main pipe 1;

[0066] A tightening angle 33 is provided in the main pipe 1 for bringing the fastener 31 closer;

[0067] The limiting ring 34 is used to limit the lowering limit height of the fastener 31, and the outer side is inclined;

[0068] The driving ring 35 is fixed to the bottom of the valve seat 12 and is inclined on the outside;

[0069] The synchronous slide bar 4 is slidably disposed in the trigger ring 11, and both ends thereof penetrate the trigger ring 11;

[0070] A clamp structure, used to fix the limiting ring 34;

[0071] Specifically, the main pipe 1 is connected to the wellhead device in advance, and the trigger ring 11, the valve seat 12 and the top of the valve core 13 form a completed top, which can prevent seawater from entering the wellhead, resulting in a large amount of seawater in the initial stage of oil production, affecting the quality of crude oil and increasing the processing cost; the valve seat 12 can rise slightly under the action of crude oil pressure, and the valve seat 12 squeezes the synchronous slide rod 4, and the synchronous slide rod 4 squeezes the limit ring 34, so that the limit ring 34 rises synchronously. As the limit ring 34 rises, the limit distance of the fastener 31 is shortened. When the connecting pipe 61 retreats, the fastener 31 can clamp the connecting pipe 61 more quickly to control the insertion depth of the connecting pipe 61. Under the condition of ensuring that crude oil does not leak, the depth of the connecting pipe 61 can be reasonably controlled to reduce the difficulty of disassembling the connecting pipe 61;

[0072] During installation, the bottom of the connecting tube 61 is pressed against the trigger ring 11 and inserted into the main tube 1. The outer wall of the connecting tube 61 squeezes the rubber ring 32, making the side wall of the rubber ring 32 longer, and the fastener 31 descends. The fastener 31 can move, and the friction between the fastener 31 and the connecting tube 61 is insufficient, so as not to hinder the descent of the connecting tube 61; the trigger ring 11 is squeezed and drives the synchronous slide bar 4 to descend. In the initial stage of the descent of the synchronous slide bar 4, the limit ring 34 is still supported by sliding, and the trigger ring 11 fixes the limit ring 34 through the clamp structure to prevent the limit ring 34 from descending, thereby changing the insertion depth of the connecting tube 61 and affecting the connection The connection reliability of the pipe 61; the synchronous slide rod 4 drops with the trigger ring 11 and separates from the limit ring 34 and the drive ring 35, and the trigger ring 11 presses down the limit structure, so that the limit structure changes the restriction of the valve seat 12 and the valve core 13 from limiting the descent of the valve seat 12 and the rise of the valve core 13 to limiting the up and down movement of the valve seat 12, and no longer restricts the valve core 13. When the crude oil is extracted, the valve core 13 rises, and the crude oil flows through the gap between the valve seat 12 and the valve core 13. On the contrary, the valve core 13 drops under the gravity of the crude oil, and the valve core 13 fits with the valve seat 12 again, avoiding the reflux of crude oil and affecting the crude oil extraction speed;

[0073] At this time, the connecting pipe 61 is slightly increased due to the crude oil pressure, and the connecting pipe 61 drives the fastener 31 to rise through the friction force. The fastener 31 compresses the rubber ring 32, thereby increasing the seal between the rubber ring 32 and the connecting pipe 61. The fasteners 31 are moved closer to each other due to the tightening angle 33, thereby increasing the pressure and friction between the tightening angle 33 and the connecting pipe 61, thereby achieving the tightening of the connecting pipe 61. The tightening degree of the connecting pipe 61 is proportional to the crude oil pressure, which can ensure the connection reliability of the connecting pipe 61. At the same time, after the crude oil extraction is completed, the connection strength of the friction connecting pipe 61 can be reduced, thereby reducing the difficulty of disassembly.

[0074] In summary, before the wellhead device is connected to the pipeline, the rising distance of the valve seat 12 is controlled by the pressure of crude oil, and the pressure and friction between the valve seat 12 and the valve core 13 are controlled. The valve seat 12 and the valve core 13 play the role of a blowout prevention device to avoid crude oil leakage and affect the ecological environment.

[0075] By controlling the displacement of the synchronous slide rod 4 at a fixed height through the rising distance of the valve seat 12, the limit ring 34 rises synchronously with the valve seat 12, and the lowering limit height of the fastener 31 is shortened, so that the connecting pipe 61 can be clamped more quickly through the fastener 31, and the insertion depth of the connecting pipe 61 can be controlled. Under the condition of ensuring that the crude oil does not leak, the depth of the connecting pipe 61 can be reasonably controlled to reduce the difficulty of disassembling the connecting pipe 61;

[0076] After the connecting pipe 61 drops to the limit position, the crude oil pressure rises slightly. The connecting pipe 61 drives the fastener 31 to rise through friction. The fastener 31 compresses the rubber ring 32 to increase the seal between the rubber ring 32 and the connecting pipe 61. The fasteners 31 are moved closer to each other due to the tightening angle 33, which increases the pressure and friction between the tightening angle 33 and the connecting pipe 61, thereby achieving the tightening of the connecting pipe 61. The tightening degree of the connecting pipe 61 is proportional to the crude oil pressure, which can ensure the connection reliability of the connecting pipe 61. At the same time, after the crude oil extraction is completed, the connection strength of the friction connecting pipe 61 can be reduced to reduce the difficulty of disassembly.

[0077] As a further solution of the present invention, a lower valve stem 15 and an upper valve stem 14 are fixedly provided at the bottom of the valve seat 12 and the valve core 13, respectively, and a pressure ring 16 is fixedly provided at the upper valve stem 14 and the lower valve stem 15;

[0078] The limiting structure comprises:

[0079] The sleeve 21 is rotatably arranged with the main pipe 1, and a switching groove 22 is opened on the side wall;

[0080] The lifting ring 23 is slidably arranged with the sleeve 21, and a switching key 24 is fixedly arranged on the inner wall thereof to interact with the switching slot 22;

[0081] A limit spring 25 is located between the lifting ring 23 and the main pipe 1 and is used for resetting the lifting ring 23;

[0082] An upper limit member 26 is fixed to the sleeve 21 and is located above the pressing ring 16 to limit the upward movement of the pressing ring 16;

[0083] The lower limit member 27 is fixed to the main pipe 1 and is located below the pressing ring 16 to limit the downward movement of the pressing ring 16;

[0084] For details, see the attached manual. Figure 3 , Figure 5 , Figure 6 and Figure 7 When the trigger ring 11 contacts the lifting ring 23, the lifting ring 23 compresses the limit spring 25 and drives the switch key 24. The switch key 24 drives the sleeve 21 to rotate through the switching slot 22, and the sleeve 21 drives the upper limit member 26 to rotate. The upper limit member 26 rotates from the side of the upper valve stem 14 to the side of the lower valve stem 15. The upper limit member 26 and the lower limit member 27 limit the lower valve stem 15 through the pressure ring 16. The lower valve stem 15 cannot be lifted or lowered, and the restriction on the valve seat 12 and the valve core 13 can be changed from restricting the descent of the valve seat 12 and the rise of the valve core 13 to restricting the up and down movement of the valve seat 12, and the valve core 13 is no longer restricted; during the crude oil extraction process, when taking oil, the valve core 13 rises, and the crude oil flows through the gap between the valve seat 12 and the valve core 13. On the contrary, the valve core 13 descends under the gravity of the crude oil, and the valve core 13 fits with the valve seat 12 again, avoiding crude oil reflux and affecting the crude oil extraction speed.

[0085] As a further solution of the present invention, the clamp structure comprises:

[0086] The clamp 51 is used to fix the limiting ring 34;

[0087] The seesaw 52 is rotatably arranged with the main pipe 1 and fixed to the limiting ring 34 through the clamp 51;

[0088] The spring plate 53 is fixed on the seesaw 52;

[0089] The wedge block 54 is fixed to the bottom of the trigger ring 11, and controls the clamp 51 to release the fixing of the limit ring 34 by driving the bottom of the seesaw 52 to move;

[0090] For details, see Figure 3 and Figure 4 When the trigger ring 11 descends, the wedge block 54 also descends and separates from the seesaw 52. The spring plate 53 in the force storage state pushes the seesaw 52 to rotate. The seesaw 52 clamps the limit ring 34 through the clamp 51 to fix the limit ring 34, thereby preventing the limit ring 34 from being squeezed by the fastener 31 and descending, thereby changing the insertion depth of the connecting pipe 61 and affecting the connection reliability of the connecting pipe 61.

[0091] As a further solution of the present invention, it also includes:

[0092] The connecting pipe 61 has a mounting opening 62 at the bottom, and its outer diameter is the same as that of the trigger ring 11;

[0093] The limiting plate 63 is plugged into and matched with the mounting opening 62;

[0094] An upper sliding sleeve 64 and a lower sliding sleeve 65, wherein the upper sliding sleeve 64 and the lower sliding sleeve 65 are fixed to the connecting pipe 61 and the limiting plate 63 respectively;

[0095] The return spring 66 is fixed between the connecting pipe 61 and the limiting plate 63;

[0096] For details, see the attached manual. Figure 1 and Figure 2 When the connecting pipe 61 contacts the trigger ring 11, the trigger ring 11 can be driven to descend; at the same time, when oil is produced, the limit plate 63 is increased by the pressure difference and the mounting port 62 is exposed, and the crude oil can enter the connecting pipe 61 through the mounting port 62. On the contrary, the limit plate 63 blocks the mounting port 62, further preventing the crude oil from flowing back, and increasing the difficulty and cost of crude oil production;

[0097] Before the connecting pipe 61 contacts the trigger ring 11, the return spring 66 is used to offset the thrust of the seawater on the limit plate 63 by squeezing the limit plate 63 downward, thereby preventing seawater from entering the connecting pipe 61 before the connecting pipe 61 is installed, resulting in a large amount of seawater in the initial stage of oil production, affecting the quality of the crude oil and increasing the processing cost.

[0098] As a further solution of the present invention, a top plate 7 is provided on the top of the main pipe 1, and there is a gap between the top plate 7 and the rubber ring 32;

[0099] Specifically, the gap between the top plate 7 and the rubber ring 32 can provide some space for the rubber ring 32 to deform, thereby preventing the rubber ring 32 from being over-extruded and damaged, and extending the service life and number of times of the rubber ring 32. The rubber ring 32 can be replaced by disassembling the top plate 7.

[0100] As a further solution of the present invention, a stopper 36 is fixedly disposed on the outer wall of the limit ring 34, and the stopper 36 is made of rubber;

[0101] Specifically, the stopper 36 can increase the friction between the limiting ring 34 and the main pipe 1 , so that when the limiting ring 34 is not subjected to force, the limiting ring 34 can be prevented from moving randomly to affect the connection depth of the connecting pipe 61 .

[0102] As a further solution of the present invention, the synchronous slide rod 4 includes a guide rod 41, both ends of the guide rod 41 are provided with chamfers matching the inclined surfaces of the limit ring 34 and the drive ring 35, and a synchronous spring 42 is fixed between the guide rod 41 and the trigger ring 11;

[0103] For details, see the instructions Figure 3 and Figure 4 Before the guide rod 41 disengages from the drive ring 35, the chamfers on both sides of the guide rod 41 can synchronously transmit the displacement of the drive ring 35 to the limit ring 34, so that the limit ring 34 moves synchronously, thereby changing the height of the limit ring 34 and controlling the insertion depth of the connecting pipe 61; at the same time, when the synchronous slide bar 4 descends, the guide rod 41 moves to the side of the limit ring 34, so that the limit ring 34 and the drive ring 35 maintain a constant height, and the guide rod 41 moves in the opposite direction and compresses the synchronous spring 42 when it contacts the main pipe 1. When the synchronous slide bar 4 rises to disengage from the main pipe 1, the synchronous spring 42 can move the guide rod 41 to the side of the limit ring 34 to prevent the guide rod 41 from being affected by the drive ring 35; it should be noted that the elastic force of the synchronous spring 42 is sufficient to cause the guide rod 41 to rebound, and the elastic force requirement is low, which is not enough to drive the limit ring 34 to rise, and the influence on the position of the limit ring 34 can be ignored.

[0104] As a further solution of the present invention, the inner side of the fastener 31 is a rough surface, which is used to increase the friction between the fastener 31 and the connecting tube 61 and improve the sensitivity of the fastener 31 rising with the connecting tube 61.

[0105] An underwater deep-layer oil production method, the specific steps are as follows:

[0106] Step 1: Connect the main pipe 1 to the wellhead device in advance, and form a complete top with the trigger ring 11, the valve seat 12 and the top of the valve core 13, which can prevent seawater from entering the wellhead, resulting in a large amount of seawater in the initial stage of oil production, affecting the quality of crude oil and increasing the processing cost;

[0107] Step 2: The valve seat 12 is slightly raised by the crude oil pressure, and the valve seat 12 drives the limit ring 34 to rise synchronously through the synchronous slide rod 4, shortening the limit distance of the fastener 31 to fall, controlling the insertion depth of the connecting pipe 61, and reasonably controlling the depth of the connecting pipe 61 to reduce the difficulty of disassembling the connecting pipe 61;

[0108] Step 3: The connecting tube 61 contacts the trigger ring 11 and is inserted into the main tube 1. The trigger ring 11 is squeezed and drives the synchronous slide bar 4 to descend. In the initial stage of the descent of the synchronous slide bar 4, the limit ring 34 is still supported by sliding. The trigger ring 11 fixes the limit ring 34 through the clamp structure to prevent the limit ring 34 from descending, thereby changing the insertion depth of the connecting tube 61 and affecting the connection reliability of the connecting tube 61.

[0109] Step 4: The trigger ring 11 presses down the limit structure, so that the limit structure changes the limit on the valve seat 12 and the valve core 13 from limiting the descent of the valve seat 12 and the ascent of the valve core 13 to limiting the up and down movement of the valve seat 12, and no longer limits the valve core 13;

[0110] Step 5: The connecting pipe 61 is slightly raised by the crude oil pressure, and the connecting pipe 61 drives the fastener 31 to rise. The fastener 31 is moved closer to each other by the tightening angle 33, thereby achieving the tightening of the connecting pipe 61. The tightening degree of the connecting pipe 61 is proportional to the crude oil pressure, which can ensure the connection reliability of the connecting pipe 61.

[0111] Step 6: After the installation is completed, oil production begins. When the donkey head rises, the pressure on the top of the connecting pipe 61 decreases, the valve core 13 rises, and the crude oil flows through the gap between the valve seat 12 and the valve core 13. On the contrary, the valve core 13 drops and re-fits with the valve seat 12 to avoid crude oil reflux and affect the crude oil production speed.

Claims

1. An underwater deep-layer oil production device, comprising a main pipe (1), characterized in that: A trigger ring (11), a valve seat (12) and a valve core (13), wherein the trigger ring (11), the valve seat (12) and the valve core (13) are sequentially sleeved in the main pipe (1) from the outside to the inside, and the outer ring of the valve core (13) and the inner ring of the valve seat (12) are both provided with chamfers that match each other; a lower valve stem (15) and an upper valve stem (14) are respectively fixed at the bottom of the valve seat (12) and the valve core (13), and a pressure ring (16) is fixed on the upper valve stem (14) and the lower valve stem (15); A limit structure for limiting the descent of the valve seat (12) and the rise of the valve core (13); Fasteners (31) are arranged in a circumferential array within the main pipe (1); A rubber ring (32) is used to connect the fastener (31) and is slidably arranged with the main pipe (1); A tightening angle (33) is provided in the main pipe (1) and is used to bring the fastener (31) closer together; A limit ring (34) is used to limit the lowering limit height of the fastener (31), and the outer side is inclined; The drive ring (35) is fixedly mounted on the bottom of the valve seat (12) and has an outer side that is inclined; A synchronous slide bar (4) is slidably disposed in the trigger ring (11), and both ends thereof penetrate the trigger ring (11); A clamp structure, used for fixing the limiting ring (34); The limiting structure comprises: The sleeve (21) is rotatably arranged with the main pipe (1), and a switching groove (22) is formed on the side wall; A lifting ring (23) is slidably arranged with the sleeve (21), and a switching key (24) is fixedly arranged on the inner wall thereof and interactively arranged with the switching groove (22); A limit spring (25), located between the lifting ring (23) and the main pipe (1), and used for resetting the lifting ring (23); An upper limit member (26) is fixedly mounted on the sleeve (21), is located above the pressing ring (16), and is used to limit the upward movement of the pressing ring (16); The lower limit member (27) is fixed to the main pipe (1) and is located below the pressure ring (16) and is used to limit the descent of the pressure ring (16).

2. The underwater deep-layer oil production device according to claim 1, characterized in that: The clamp structure comprises: A clamp (51) for fixing the limiting ring (34); The seesaw (52) is rotatably arranged with the main pipe (1) and is fixed to the limiting ring (34) via a clamp (51); A spring plate (53) is fixedly mounted on the seesaw plate (52); The wedge block (54) is fixedly arranged at the bottom of the trigger ring (11), and controls the clamping member (51) to release the fixation of the limiting ring (34) by driving the bottom of the seesaw (52) to move.

3. The underwater deep-layer oil production device according to claim 1, characterized in that: Also includes: A connecting pipe (61) having a mounting opening (62) at the bottom and an outer diameter that is the same as the outer diameter of the trigger ring (11); A limit plate (63) is plugged into and matched with the mounting opening (62); An upper sliding sleeve (64) and a lower sliding sleeve (65), wherein the upper sliding sleeve (64) and the lower sliding sleeve (65) are respectively fixed to the connecting pipe (61) and the limiting plate (63); The return spring (66) is fixedly arranged between the connecting pipe (61) and the limiting plate (63).

4. The underwater deep-layer oil production device according to claim 1, characterized in that: A top plate (7) is arranged on the top of the main pipe (1), and a gap exists between the top plate (7) and the rubber ring (32).

5. The underwater deep-layer oil production device according to claim 1, characterized in that: A stop piece (36) is fixedly provided on the outer side wall of the limiting ring (34), and the stop piece (36) is made of rubber.

6. The underwater deep-layer oil production device according to claim 1, characterized in that: The synchronous slide rod (4) comprises a guide rod (41), both ends of the guide rod (41) are provided with chamfers matching the inclined surfaces of the limit ring (34) and the drive ring (35), and a synchronous spring (42) is fixedly arranged between the guide rod (41) and the trigger ring (11).

7. The underwater deep-layer oil production device according to claim 1, characterized in that: The inner side of the fastener (31) is a rough surface, which is used to increase the friction between the fastener (31) and the connecting pipe (61).

8. An underwater deep-layer oil production method, applicable to an underwater deep-layer oil production device according to any one of claims 1 to 7, characterized in that: The specific steps are as follows: Step 1: The main pipe (1) is connected to the wellhead device in advance, and the trigger ring (11), the valve seat (12) and the top of the valve core (13) form a completed top, which can prevent seawater from entering the wellhead, resulting in a large amount of seawater in the initial stage of oil production, affecting the quality of crude oil and increasing the processing cost; Step 2: The valve seat (12) is slightly raised by the crude oil pressure, and the valve seat (12) drives the limit ring (34) to rise synchronously through the synchronous slide rod (4), thereby shortening the limit distance of the fastener (31) to fall, controlling the insertion depth of the connecting pipe (61), and reasonably controlling the depth of the connecting pipe (61), thereby reducing the difficulty of disassembling the connecting pipe (61); Step 3: The connecting tube (61) contacts the trigger ring (11) and is inserted into the main tube (1). The trigger ring (11) is squeezed and drives the synchronous slide bar (4) to descend. In the initial stage of the descent of the synchronous slide bar (4), the limit ring (34) is still supported by sliding. The trigger ring (11) fixes the limit ring (34) through the clamp structure to prevent the limit ring (34) from descending, thereby changing the insertion depth of the connecting tube (61) and affecting the connection reliability of the connecting tube (61). Step 4: The trigger ring (11) presses down the limit structure, so that the limit structure changes the limit on the valve seat (12) and the valve core (13) from limiting the descent of the valve seat (12) and the ascent of the valve core (13) to limiting the up and down movement of the valve seat (12), and no longer limits the valve core (13); Step 5: The connecting pipe (61) is slightly raised due to the crude oil pressure, and the connecting pipe (61) drives the fastener (31) to rise. The fasteners (31) are moved closer to each other due to the tightening angle (33), thereby achieving the tightening of the connecting pipe (61). The tightening degree of the connecting pipe (61) is proportional to the crude oil pressure, and the connection reliability of the connecting pipe (61) can be ensured. Step 6: After the installation is completed, oil production begins. When the donkey head rises, the pressure at the top of the connecting pipe (61) decreases, the valve core (13) rises, and crude oil flows through the gap between the valve seat (12) and the valve core (13). On the contrary, the valve core (13) drops and fits the valve seat (12) again to avoid crude oil backflow and affect the crude oil production speed.

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