Double-layer heat insulation gas injection wellhead

Abstract

The invention relates to the technical field of oil and gas production equipment, and discloses a double-layer heat insulation gas injection wellhead. An upper pipe sleeve; a lower pipe sleeve; a plurality of branch pipes are arranged on the main pipeline, and control valves are arranged on the branch pipes; the upper pipe sleeve and the lower pipe sleeve are each of a double-layer structure, an upper pipe cavity and a lower pipe cavity are formed in the upper pipe sleeve and the lower pipe sleeve respectively, and the upper pipe sleeve and the lower pipe sleeve are fixedly connected through a plurality of bolts. According to the double-layer heat-insulation gas injection well mouth, the upper pipe sleeve and the lower pipe sleeve are arranged to be of a double-layer structure capable of being communicated, internal cavities can be communicated into one cavity, then loop circulation is achieved by controlling flowing of heat-insulation fluid, the temperature of the well mouth is effectively isolated by means of the flowing characteristic, and the heat insulation effect is improved. The temperature of the pipeline of the well mouth can not be increased along with the internal temperature, heat loss is avoided, internal heat can be prevented from being radiated to the outer pipe, effective temperature control and heat insulation are achieved, and therefore the safety of using the well mouth is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas production equipment, and specifically to a double-layer heat-insulated gas injection wellhead. Background Art

[0002] The core function of the wellhead device is to control the pressure and direction of the fluid in the oil and gas well to prevent safety accidents such as blowouts. At the same time, it can adjust the production parameters of oil, gas, and water wells, and achieve flow monitoring and pressure balance through valves and instruments. According to the petroleum industry standard issued in 2025, this device is the main equipment for controlling and regulating the production of oil and gas wells at the uppermost part of the oil and gas wells, and its core functions include sealing the wellhead, suspending the pipe string, controlling pressure, etc.

[0003] When the current gas production wellhead device is in use, first of all, affected by the external environment of the oil field or gas field, in enhanced oil recovery (EOR) processes such as steam flooding (steam huff and puff), CO2 flooding, and high-temperature gas injection, the injected fluid (such as steam, hot nitrogen, supercritical CO2) is usually in a high-temperature state (200°C to 350°C or even higher). Therefore, if the wellhead is not heat-insulated, the heat will quickly dissipate to the atmosphere or the surface formation, resulting in the condensation of steam into water, reducing the thermal recovery efficiency; the phase change of supercritical CO2 (supercritical → liquid / gas) affects the oil displacement effect; it increases the heating energy consumption and raises the operating cost.

[0004] However, the current heat-insulation methods are too single, using two methods of vacuum heat-insulated pipes + nano-aerogel coating layers. Their heat-insulation effect is too single. Because of the wrapping with some heat-insulation materials, the temperature inside will still be radiatively transferred to the heat-insulation materials, and the heat cannot be effectively isolated. And with long-term wrapping, the thermal radiation pressure on the pipeline will be relatively large. If the wellhead valve is in a high-temperature environment for a long time, the sealing performance of the valve will be greatly reduced. Moreover, the existing technology has too single a heat-insulation effect on the wellhead, resulting in a low heat-insulation effect. Therefore, a double-layer heat-insulated gas injection wellhead is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a double-layer heat-insulated gas injection wellhead, which solves the problem that the heat-insulation effect of the prior art on the wellhead is too single and the heat-insulation effect is low.

[0006] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solution: a double-layer heat-insulating gas injection wellhead, comprising: a main pipeline; an upper pipe sleeve; a lower pipe sleeve; a plurality of branch pipes are arranged on the main pipeline, and control valves are arranged on the branch pipes; both the upper pipe sleeve and the lower pipe sleeve are arranged as double-layer structures, and an upper pipe cavity and a lower pipe cavity are respectively arranged inside, the upper pipe sleeve and the lower pipe sleeve are fixedly connected by a plurality of bolts, and the upper pipe cavity and the lower pipe cavity communicate with each other; heat-insulating fluid is arranged inside the upper pipe cavity and the lower pipe cavity; a heat-insulating auxiliary mechanism for providing flowing liquid to carry out heat insulation protection on the upper pipe sleeve and the lower pipe sleeve; the heat-insulating auxiliary mechanism includes a power assembly, a flowing assembly, and a coolant flowing assembly; the power assembly is used for providing liquid flowing power; the flowing assembly is used for providing a flowing circuit to circulate the heat-insulating fluid inside the upper pipe cavity and the lower pipe cavity; the coolant flowing assembly is used for providing cooling liquid to flow-cool the control valve.

[0007] Preferably, the power assembly includes a driving blade, the driving blade is located inside the main pipeline, when the fluid inside the main pipeline flows, it will drive the driving blade to rotate by itself, a driving shaft is fixedly connected to the driving blade, the driving shaft passes through the main pipeline and is fixedly connected to a flowing blade, a connecting piece sleeve is arranged on the main pipeline, the flowing blade is located inside the sleeve, the left and right ends of the sleeve are connected with pipelines, and the two pipelines are respectively communicated with the upper pipe cavity and the lower pipe cavity, and the upper pipe cavity, the lower pipe cavity, the sleeve and the two pipelines form a closed circuit.

[0008] Preferably, the pipe sleeve includes an outer pipe, an insulating pipe and an inner pipe, a cavity one is formed between the outer pipe and the insulating pipe, a cavity two is formed between the insulating pipe and the inner pipe, a cavity three is arranged inside the inner pipe, nitrogen is arranged inside the cavity two, and an injection pipe is connected to the cavity two.

[0009] Preferably, the flowing assembly includes a crankshaft, the crankshaft is fixed on the end face of the driving shaft, a moving connecting rod is rotatably connected to the crankshaft, a sliding piston is rotatably connected to the bottom of the moving connecting rod, the surface of the sliding piston is slidably connected to a sliding pipe, the sliding pipe is connected to the outer pipe, the bottom of the sliding pipe is connected with a liquid pipe, the bottom of the liquid pipe is communicated with an upper connecting pipe, the upper connecting pipe is communicated with the upper pipe cavity, a drainage pipe and a return pipe are communicated with the cavity one, the bottom of the drainage pipe is communicated with the liquid pipe, and the bottom of the return pipe is communicated with the lower pipe cavity.

[0010] Preferably, one-way valves are arranged inside both the drainage pipe and the return pipe, when the sliding piston moves upward, it will suck the heat-insulating fluid inside the upper pipe cavity into the liquid pipe through the upper connecting pipe, and when the sliding piston moves downward, it will squeeze the heat-insulating fluid inside the liquid pipe, so that it flows back into the lower pipe cavity through the circuit of the drainage pipe, the cavity one and the return pipe.

[0011] Preferably, the temperature control component includes a heating module which is arranged inside the first cavity and is used for controlling the temperature of the heat insulation fluid so that its temperature is controlled within a set value.

[0012] Preferably, the cooling component includes a coolant which is arranged inside the third cavity. Both ends of the third cavity are respectively connected with pipelines. A plurality of control valves are provided, and flow cavities are arranged inside the plurality of control valves. The pipelines are communicated with the internal flow cavities of the plurality of control valves to form a closed loop. An intermediate sleeve is arranged inside the inner pipe. Right openings and left openings are formed on the left and right sides of the intermediate sleeve. A spiral fin is arranged inside the inner pipe. Liquid inlets and liquid outlets are formed on the left and right sides of the inner pipe.

[0013] Preferably, a flow control component is further included. The flow control component includes a heat conduction pipe which is installed inside the main pipeline. A temperature and pressure sliding sheet is slidably connected inside the heat conduction pipe. A heat conduction sheet is arranged inside the heat conduction pipe. One end of the heat conduction sheet extends into the main pipeline and is used for heat conduction of the high-temperature fluid in the main pipeline. An expansion gas is arranged inside the heat conduction pipe. A pressure spring is connected to one side of the temperature and pressure sliding sheet. Two guide rods are connected to one side of the temperature and pressure sliding sheet. One end of each guide rod is connected with a flow guide plate. The two flow guide plates are respectively slidably connected inside the right opening and the left opening.

[0014] Preferably, a transparent display pipe is connected to the heat conduction pipe, and scale lines are arranged on the transparent display pipe.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a double-layer heat insulation gas injection wellhead, which has the following beneficial effects: 1. For this double-layer heat insulation gas injection wellhead, by setting the upper pipe sleeve and the lower pipe sleeve into a double-layer structure that can be communicated, the internal cavities can be communicated into one cavity, and then the loop circulation is realized by controlling the flow of the heat insulation fluid. Therefore, compared with the traditional fixed heat insulation material wrapping, this kind of heat insulation structure can realize the effective flow of the heat insulation fluid to achieve heat insulation, and use the flowing characteristics to effectively isolate the temperature of the wellhead. It can not only ensure that the pipeline temperature of the wellhead will not cause heat loss as the internal temperature increases, but also avoid the internal heat radiation to the outer pipe, realizing effective temperature control and heat insulation, thereby improving the safety of wellhead use.

[0016] 2. For this double-layer heat insulation gas injection wellhead, through the arranged flowing coolant, the plurality of valves can be cooled by flowing, avoiding the high temperature inside the wellhead from radiating into the control valves, resulting in the reduction of the sealing performance of the control valves and the reduction of the flow control ability, and further improving the safety of wellhead use from the side.

[0017] 3. The double-layer heat-insulating gas injection wellhead can automatically control the flow rate of the coolant through the set flow control component. When the internal temperature of the wellhead is higher, it will control the flow rates of the internal coolant and heat-insulating fluid to increase, so as to achieve rapid cooling and rapid flow of the heat-insulating fluid, thus making the temperature and flow rate have a positive relationship and improving the heat-insulating effect and cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of the overall structure of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 2 FIG. is a schematic diagram of the connection structure of the upper pipe sleeve and the lower pipe sleeve of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 3 FIG. is a schematic diagram of the structure of the heat-insulating auxiliary mechanism of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 4 FIG. is a schematic diagram of the connection structure of the sliding piston of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 5 FIG. is a schematic diagram of the structure of the flow control component of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 6 FIG. is a schematic diagram of the structure of the pipe sleeve of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 7 FIG. is a schematic diagram of the cross-sectional structure of the upper pipe sleeve of a double-layer heat-insulating gas injection wellhead proposed by the present invention; Figure 8 FIG. is a schematic diagram of the cross-sectional structure of the lower pipe sleeve of a double-layer heat-insulating gas injection wellhead proposed by the present invention.

[0019] In the figure: 1, main pipeline; 2, upper pipe sleeve; 21, upper pipe cavity; 3, lower pipe sleeve; 31, lower pipe cavity; 4, branch pipe; 5, heat-insulating auxiliary mechanism; 501, outer pipe; 502, partition pipe; 503, inner pipe; 504, intermediate sleeve; 505, liquid inlet; 506, liquid outlet; 507, spiral fin; 508, driving blade; 509, driving shaft; 510, flow blade; 511, crankshaft; 512, sliding piston; 513, motion connecting rod; 514, sliding pipe; 515, liquid pipe; 516, upper connecting pipe; 517, drainage pipe; 518, return pipe; 519, right opening; 520, left opening; 521, heat conducting fin; 522, heat conducting pipe; 523, temperature and pressure sliding piece; 524, pressure spring; 525, guide rod; 526, guide plate; 527, transparent display pipe; 6, control valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Please refer to Figures 1-8 , a double-layer heat-insulating gas injection wellhead, comprising a main pipeline 1; an upper pipe sleeve 2; a lower pipe sleeve 3; a plurality of branch pipes 4 are arranged on the main pipeline 1, and control valves 6 are arranged on the branch pipes 4; both the upper pipe sleeve 2 and the lower pipe sleeve 3 are arranged as double-layer structures, and an upper pipe cavity 21 and a lower pipe cavity 31 are respectively arranged inside. The upper pipe sleeve 2 and the lower pipe sleeve 3 are fixedly connected by a plurality of bolts, and the upper pipe cavity 21 and the lower pipe cavity 31 are communicated with each other; by setting the upper pipe sleeve 2 and the lower pipe sleeve 3 into a double-layer structure that can be communicated, the internal cavities can be communicated into one cavity, and then the loop circulation is realized by controlling the flow of the heat-insulating fluid. Therefore, compared with the traditional fixed heat-insulating material wrapping, this kind of heat-insulating structure can effectively realize the flow of the heat-insulating fluid, realize heat insulation, and effectively isolate the temperature of the wellhead by using the characteristics of the flow, which can ensure that the pipeline temperature of the wellhead will not increase with the internal temperature and cause heat loss. The inside of the upper pipe cavity 21 and the lower pipe cavity 31 is provided with a heat-insulating fluid; a heat-insulating auxiliary mechanism 5 is used to provide flowing liquid to protect the upper pipe sleeve 2 and the lower pipe sleeve 3 from heat; the heat-insulating auxiliary mechanism 5 includes a power component, a flow component and a coolant flow component; the power component is used to provide the power for the liquid flow; the flow component is used to provide a flow loop to circulate the heat-insulating fluid inside the upper pipe cavity 21 and the lower pipe cavity 31; the coolant flow component is used to provide cooling liquid to cool the control valve 6 by flowing. The selection of the heat-insulating fluid can be based on the temperature of each wellhead. It can be directly cooling water or silicone liquid. Silicone liquid is a heat-insulating liquid with good high-temperature stability, excellent thermal conductivity and corrosion resistance. Silicone liquid is usually composed of polydimethylsiloxane PDMS and silicone resin, and has high temperature stability and antioxidant properties. Silicone liquid is mainly applied to fields such as high-temperature equipment, electronic components and optical instruments, and has excellent heat-insulating performance and stability.

[0022] In this embodiment, the power assembly includes a driving blade 508 located inside the main pipeline 1. When the fluid flows inside the main pipeline 1, it will drive the driving blade 508 to rotate on its own. A driving shaft 509 is fixedly connected to the driving blade 508. The driving shaft 509 passes through the main pipeline 1 and is fixedly connected to a flow blade 510. The main pipeline 1 is connected by a connecting piece sleeve. The flow blade 510 is located inside the sleeve. The left and right ends of the sleeve are connected to pipelines, and the two pipelines are respectively communicated with the upper cavity 21 and the lower cavity 31. The upper cavity 21, the lower cavity 31, the sleeve and the two pipelines form a closed loop. When the air flow circulates inside the main pipeline 1, it will drive the rotation of the driving blade 508 through the fluid flow. The rotation of the driving blade 508 will synchronously drive the rotation of the driving shaft 509, and then drive the rotation of the crankshaft 511. Therefore, the overall power at this time comes from the flow inside the wellhead. The fluid flow in the well is used to provide rotational power without adding electrical components.

[0023] Furthermore, the pipe sleeve includes an outer pipe 501, a partition pipe 502 and an inner pipe 503. A cavity one is formed between the outer pipe 501 and the partition pipe 502, a cavity two is formed between the partition pipe 502 and the inner pipe 503, and a cavity three is arranged inside the inner pipe 503. Nitrogen is arranged inside the cavity two, and an injection pipe is connected to the cavity two. Through the arranged injection pipe, the consumption of nitrogen can be supplemented, and the internal nitrogen concentration does not need to be too high, as long as the low-temperature environment generated inside can effectively cool the coolant and the heat-insulating liquid. Since the nitrogen is in the middle layer, it will radiate up and down to the pipelines of the coolant and the heat-insulating liquid to achieve radiative cooling.

[0024] Furthermore, the flow component includes a crankshaft 511 fixed to the end face of the drive shaft 509. A moving connecting rod 513 is rotatably connected to the crankshaft 511. The bottom of the moving connecting rod 513 is rotatably connected to a sliding piston 512. The surface of the sliding piston 512 is slidably connected to a sliding tube 514. The sliding tube 514 is connected to the outer tube 501. The bottom of the sliding tube 514 is connected to a liquid tube 515. The bottom of the liquid tube 515 communicates with an upper connecting tube 516. The upper connecting tube 516 communicates with the upper tube cavity 21. A drainage tube 517 and a return tube 518 communicate with the first cavity. The bottom of the drainage tube 517 communicates with the liquid tube 515. The bottom of the return tube 518 communicates with the lower tube cavity 31. When the crankshaft 511 rotates, it will drive the moving connecting rod 513 to move up and down, and then drive the sliding piston 512 to move up and down. Using the principle of piston sliding, a negative pressure suction force will be generated. The internal heat-insulating fluid of the upper tube cavity 21 will be sucked through the upper connecting tube 516 and then sucked into the interior of the liquid tube 515. Then, as the sliding piston 512 moves downward, the fluid inside the liquid tube 515 will be squeezed and injected into the interior of the first cavity through the pipeline of the drainage tube 517, and then return to the interior of the lower tube cavity 31 through the channel of the return tube 518. Therefore, at this time, the heat-insulating fluid will form a circulating flow loop. At this time, by using the flowing heat-insulating fluid to pass through the radiation low-temperature area of nitrogen, the heat-insulating fluid will be cooled, so as to always keep the temperature of the heat-insulating fluid in a constant temperature state and ensure that its heat-insulating effect is in a constant state.

[0025] In addition, one-way valves are provided inside both the drainage tube 517 and the return tube 518. When the sliding piston 512 moves upward, the internal heat-insulating fluid of the upper tube cavity 21 will be sucked into the interior of the liquid tube 515 through the upper connecting tube 516. When the sliding piston 512 moves downward, the internal heat-insulating fluid of the liquid tube 515 will be squeezed, so that it returns to the interior of the lower tube cavity 31 through the loop of the drainage tube 517, the first cavity and the return tube 518. By setting the one-way valves, the one-way flow of the fluid can be controlled to achieve "one suction and one discharge" so as to form a flow loop.

[0026] In addition, the cooling component includes a coolant, which is arranged inside the third cavity. Pipes are respectively connected to both ends of the third cavity. There are multiple control valves 6, and flow cavities are arranged inside each of the multiple control valves 6. The pipes are communicated with the flow cavities inside the multiple control valves 6 to form a closed loop. An intermediate sleeve 504 is arranged inside the inner pipe 503. Right openings 519 and left openings 520 are formed on the left and right sides of the intermediate sleeve 504. Spiral fins 507 are arranged inside the inner pipe 503. Liquid inlets 505 and liquid outlets 506 are formed on the left and right sides of the inner pipe 503. When the drive shaft 509 rotates, it will synchronously drive the flow blades 510 to rotate, thereby generating a rotational suction force to suck the fluid in the pipeline in series of the multiple control valves 6. Then, by using the pipeline loop, the coolant enters the inside of the inner pipe 503 from the position of the liquid inlet 505, then is discharged from the position of the liquid outlet 506, and then flows back into the inside of the control valve 6 through the pipeline. The multiple control valves 6 are cooled by flowing in series through the pipeline, avoiding the influence of high temperature on the opening and closing effect of the control valves 6, improving the service life of the equipment, and at the same time improving the use stability of the wellhead.

[0027] It should be noted that a flow control component is also included. The flow control component includes a heat conduction pipe 522, which is installed inside the main pipeline 1. A temperature and pressure sliding plate 523 is slidably connected inside the heat conduction pipe 522. Heat conduction fins 521 are arranged inside the heat conduction pipe 522. One end of the heat conduction fin 521 extends into the inside of the main pipeline 1 to conduct heat on the high-temperature fluid in the main pipeline 1. An expansion gas is arranged inside the heat conduction pipe 522. A pressure spring 524 is connected to one side of the temperature and pressure sliding plate 523. Two guide rods 525 are connected to one side of the temperature and pressure sliding plate 523. One end of each guide rod 525 is connected to a diversion plate 526. The two diversion plates 526 are respectively slidably connected inside the left opening 520 and the right opening 519. When the high-temperature gas flow inside the main pipeline 1 is relatively high, heat will be conducted out through the multiple heat conduction fins 521 and radiated into the inside of the heat conduction pipe 522, thereby causing the expansion gas inside the heat conduction pipe 522 to expand due to heat. After expansion, the gas will push the temperature and pressure sliding plate 523 to move backward, thereby driving the two guide rods 525 to move. The movement of the guide rods 525 will drive the two diversion plates 526 to slide inside the left opening 520 and the right opening 519, thereby restricting the diameters of the left opening 520 and the right opening 519. Therefore, at this time, the coolant is set according to the change of the small opening, and the faster the drive shaft 509 drives the flow blades 510 to rotate, the faster the flow rate of the coolant will be. And the rotation of the drive shaft 509 will be accelerated, and the rotation speed of the drive shaft 509 driving the crankshaft 511 will be accelerated. Similarly, for the heat insulation fluid, the suction speed will also be accelerated, thereby increasing the flow rates of the coolant and the heat insulation fluid to cope with the flow at the wellhead with a relatively high temperature.

[0028] It should be noted that a transparent display tube 527 is connected to the heat conduction tube 522, and scale lines are provided on the transparent display tube 527. The transparent display tube 527 can visually display the sliding distance of the temperature and pressure sliding plate 523, providing data reference for subsequent operators, and then controlling the gas injection flow rate of the control valve 6. The inside of the second cavity is filled with nitrogen, which is used to radiate and cool the coolant and the heat insulation fluid. By setting the nitrogen, the low temperature can be radiated to the coolant and the heat insulation liquid to control their temperatures, and at the same time, the wellhead device can be cooled, thereby improving the service life and stability of the equipment.

[0029] Working principle: First, when the entire wellhead is in use, when the air flow circulates inside the main pipeline 1, it will drive the rotation of the driving blade 508 through the flow of the fluid. The rotation of the driving blade 508 will synchronously drive the rotation of the driving shaft 509, and then drive the rotation of the crankshaft 511. The rotation of the crankshaft 511 will drive the up and down pulling of the moving connecting rod 513, and then drive the up and down movement of the sliding piston 512. Using the principle of piston sliding, a negative pressure suction force will be generated, and the internal heat-insulating fluid in the upper pipe cavity 21 will be sucked through the upper connecting pipe 516 and then sucked into the inside of the liquid pipe 515. After that, as the sliding piston 512 moves downward, the fluid inside the liquid pipe 515 will be squeezed and injected into the position inside the first cavity through the pipeline of the drainage pipe 517, and then flow back to the inside of the lower pipe cavity 31 through the channel of the return pipe 518. So at this time, the heat-insulating fluid will form a circulating flow loop. And nitrogen is provided inside the second cavity. Due to the low-temperature characteristics of nitrogen, it can cool the heat-insulating fluid and the coolant. If the heat-insulating fluid itself temperature rises due to the high-temperature radiation inside the wellhead, resulting in a decrease in its heat-insulating effect, and the temperature radiated to the outside of the wellhead also rises, at this time, the flowing heat-insulating fluid passing through the radiation low-temperature area of nitrogen will cool the heat-insulating fluid, so as to always keep the temperature of the heat-insulating fluid in a constant temperature state and ensure that its heat-insulating effect is in a constant state. It will not cause a decrease in the heat-insulating effect due to the high-temperature environment, and at the same time, it will effectively cool the pipeline of the wellhead, avoid heat damage to the wellhead caused by high temperature, and improve the stability of the wellhead operation. And the whole device is also provided with a coolant, which can be used to cool the control valve 6. When the driving shaft 509 rotates, it will synchronously drive the rotation of the flowing blade 510, and then generate a suction force to suck the fluid in the pipeline in series of multiple control valves 6. After that, using the pipeline loop, the coolant enters the inside of the inner pipe 503 from the position of the liquid inlet 505, then discharges from the position of the liquid outlet 506, and then flows back into the inside of the control valve 6 through the pipeline, and cools multiple control valves 6 in series through the pipeline connection method, avoiding the influence of high temperature on the opening and closing effect of the control valve 6, improving the service life of the device, and at the same time, improving the use stability of the wellhead.The entire device is also provided with a flow control component, the purpose of which is to automatically control the flow rates of the coolant and the heat insulation fluid. Because if the flow rate is too slow, the speed of its high-temperature radiation will be faster, which will cause the heat to radiate to the heat insulation material and the control valve 6 more quickly. The slow flow of the coolant will not be able to keep up with the speed of high-temperature radiation. Therefore, a flow control component for automatically controlling the flow rate is provided. The specific operation is as follows: when the high-temperature gas flow inside the main pipe 1 is relatively high, heat will be exported through multiple heat conduction sheets 521 and radiated into the inside of the heat conduction pipe 522, thereby causing the expansion gas inside the heat conduction pipe 522 to expand due to heat. After the gas expands, it will push the temperature and pressure sliding piece 523 to move backward, thereby driving the two guide rods 525 to move. The movement of the guide rods 525 will drive the two flow guide plates 526 to slide out of the left opening 520 and the right opening 519, thereby restricting the diameters of the left opening 520 and the right opening 519. Therefore, at this time, according to the change of the small opening, the faster the driving shaft 509 drives the rotation speed of the flow blades 510, the faster the flow rate of the coolant will be at this time. And the rotation of the driving shaft 509 will be accelerated, and the rotation speed of the driving shaft 509 driving the crankshaft 511 will be accelerated. At this time, the heat insulation fluid will be the same, and the suction speed will also be accelerated, so as to increase the flow rates of the coolant and the heat insulation fluid to cope with the flow at the wellhead with a relatively high temperature. Secondly, there is another way, that is, by reducing the flow port of the main pipe 1 through the control valve 6. At this time, the flow diameter of the gas from the main pipe 1 will become smaller, so the flow rate of the fluid will be accelerated, and then the high-speed rotation of the driving blades 508 will be controlled from the source, which will synchronously drive the high-speed rotation of the flow blades 510, thus producing the same effect of accelerated flow.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A double-layer heat-insulating gas injection wellhead, characterized in that Including: Main pipeline (1); Upper pipe sleeve (2); Lower pipe sleeve (3); A plurality of branch pipes (4) are arranged on the main pipeline (1), and control valves (6) are arranged on the branch pipes (4); Both the upper pipe sleeve (2) and the lower pipe sleeve (3) are arranged as double-layer structures, and an upper pipe cavity (21) and a lower pipe cavity (31) are respectively arranged inside. The upper pipe sleeve (2) and the lower pipe sleeve (3) are fixedly connected by a plurality of bolts, and the upper pipe cavity (21) and the lower pipe cavity (31) communicate with each other; Heat-insulating fluid is arranged inside the upper pipe cavity (21) and the lower pipe cavity (31); Heat-insulating auxiliary mechanism (5), used to provide flowing liquid to carry out heat insulation protection on the upper pipe sleeve (2) and the lower pipe sleeve (3); The heat-insulating auxiliary mechanism (5) includes a power component, a flow component and a coolant flow component; The power component is used to provide liquid flow power; The flow component is used to provide a flow circuit for circulating the heat-insulating fluid inside the upper pipe cavity (21) and the lower pipe cavity (31); The coolant flow component is used to provide cooling liquid to flow-cool the control valve (6).

2. The double-layer heat-insulating gas injection wellhead according to claim 1, wherein: The power component includes a driving blade (508), the driving blade (508) is located inside the main pipeline (1). When the fluid inside the main pipeline (1) flows, it will drive the driving blade (508) to rotate self-rotationally. A driving shaft (509) is fixedly connected to the driving blade (508), the driving shaft (509) passes through the main pipeline (1) and is fixedly connected to a flow blade (510). The main pipeline (1) is sleeved through a connecting piece, and the flow blade (510) is located inside the sleeve. The left and right ends of the sleeve are connected with pipelines, and the two pipelines are respectively communicated with the upper pipe cavity (21) and the lower pipe cavity (31). The upper pipe cavity (21), the lower pipe cavity (31), the sleeve and the two pipelines form a closed loop.

3. The double-layer heat-insulating gas injection wellhead according to claim 2, wherein: The pipe sleeve includes an outer pipe (501), a partition pipe (502) and an inner pipe (503). A cavity one is formed between the outer pipe (501) and the partition pipe (502), a cavity two is formed between the partition pipe (502) and the inner pipe (503), a cavity three is arranged inside the inner pipe (503), nitrogen is arranged inside the cavity two, and an injection pipe is connected to the cavity two.

4. The double-layer heat-insulated gas injection wellhead according to claim 3, characterized in that: The flow component includes a crankshaft (511) fixed to the end face of a drive shaft (509). A moving connecting rod (513) is rotatably connected to the crankshaft (511). A sliding piston (512) is rotatably connected to the bottom of the moving connecting rod (513). A sliding tube (514) is slidably connected to the surface of the sliding piston (512). The sliding tube (514) is connected to an outer tube (501). A liquid tube (515) is connected to the bottom of the sliding tube (514). The bottom of the liquid tube (515) communicates with an upper connecting tube (516). The upper connecting tube (516) communicates with an upper tube cavity (21). A drainage tube (517) and a return tube (518) are communicated with the first cavity. The bottom of the drainage tube (517) communicates with the liquid tube (515). The bottom of the return tube (518) communicates with a lower tube cavity (31).

5. The double-layer heat-insulated gas injection wellhead according to claim 4, characterized in that: One-way valves are provided inside both the drainage tube (517) and the return tube (518). When the sliding piston (512) moves upward, the heat-insulating fluid inside the upper tube cavity (21) will be sucked into the liquid tube (515) through the upper connecting tube (516). When the sliding piston (512) moves downward, the heat-insulating fluid inside the liquid tube (515) will be squeezed, causing it to flow back into the lower tube cavity (31) through the loop of the drainage tube (517), the first cavity, and the return tube (518).

6. The double-layer heat-insulated gas injection wellhead according to claim 3, characterized in that: The cooling component includes a coolant disposed inside a third cavity. Pipes are respectively connected to both ends of the third cavity. A plurality of control valves (6) are provided, and flow cavities are provided inside each of the plurality of control valves (6). The pipes communicate with the flow cavities inside the plurality of control valves (6) to form a closed loop. An intermediate sleeve (504) is provided inside the inner tube (503). Right openings (519) and left openings (520) are formed on the left and right sides of the intermediate sleeve (504). A spiral fin (507) is provided inside the inner tube (503). Liquid inlets (505) and liquid outlets (506) are formed on the left and right sides of the inner tube (503).

7. A double-layer heat-insulating gas injection wellhead according to claim 6, characterized in that: A flow control component is further included. The flow control component includes a heat conduction tube (522) installed inside a main pipe (1). A temperature and pressure sliding piece (523) is slidably connected inside the heat conduction tube (522). A heat conduction fin (521) is provided inside the heat conduction tube (522). One end of the heat conduction fin (521) extends into the main pipe (1) for heat conduction of the high-temperature fluid in the main pipe (1). An expansion gas is provided inside the heat conduction tube (522). A pressure spring (524) is connected to one side of the temperature and pressure sliding piece (523). Two guide rods (525) are connected to one side of the temperature and pressure sliding piece (523). One end of each guide rod (525) is connected to a diversion plate (526). The two diversion plates (526) are respectively slidably connected inside the left opening (520) and the right opening (519).

8. The double-layer heat-insulating gas injection wellhead according to claim 7, wherein: A transparent display tube (527) is connected to the heat conduction tube (522), and scale lines are provided on the transparent display tube (527).

9. The double-layer heat-insulated gas injection wellhead according to claim 7, characterized in that: The interior of the second cavity is filled with nitrogen, and the nitrogen is used for radiating and cooling the coolant and the heat insulating fluid.

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