Double insulated gas wellhead

Abstract

The application relates to the technical field of oil and gas production equipment, and discloses a double-layer heat-insulating gas injection wellhead, which comprises a main pipeline, an upper pipe sleeve and 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 both arranged in a double-layer structure, and are respectively provided with an upper pipe cavity and a lower pipe cavity in the interiors. The upper pipe sleeve and the lower pipe sleeve are fixedly connected through a plurality of bolts. The double-layer heat-insulating gas injection wellhead is characterized in that the upper pipe sleeve and the lower pipe sleeve are arranged in a double-layer structure which can be communicated, so that the cavities in the interiors are communicated into one cavity. Then, the circulation of the heat-insulating fluid is controlled to realize loop circulation. The temperature of the wellhead is effectively insulated by using the characteristics of the flow, so that the temperature of the pipeline of the wellhead cannot be increased with the increase of the temperature in the interior, heat loss is avoided, the heat in the interior cannot be radiated to the outer pipe, effective temperature control and insulation are realized, and the safety of the wellhead is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of oil and gas production equipment, in particular to a double-layer heat-insulated gas injection wellhead. BACKGROUND

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

[0003] However, the current gas wellhead device has the following problems in use: first, the external environment of an oil field or a gas field affects the heat insulation of the wellhead. In steam flooding (steam stimulation), CO2 flooding and high-temperature gas injection EOR (enhanced oil recovery) processes, the injected fluid (such as steam, hot nitrogen gas and supercritical CO2) is usually in a high-temperature state (200 DEG C to 350 DEG C or even higher), so if the wellhead is not heat-insulated, the heat will quickly dissipate to the atmosphere or the surface formation, causing the steam to condense into water and reducing the thermal recovery efficiency; the phase change of supercritical CO2 (supercritical to liquid / gas) affects the oil displacement effect; and the heating energy consumption and operating costs are increased.

[0004] The current heat insulation method is too single, and the two methods of vacuum heat insulation pipe + nano aerogel wrapping layer have a single heat insulation effect. Since some heat insulation materials are wrapped, the internal temperature will still be radiated to the heat insulation material, which cannot effectively insulate heat, and the heat radiation pressure on the pipeline will be relatively large for a long time. If the valve of the wellhead 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 a single heat insulation effect on the wellhead, resulting in a low heat insulation effect. Therefore, the double-layer heat-insulated gas injection wellhead is proposed to solve the above problems. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the deficiencies of the prior art, the application provides a double-layer heat-insulated gas injection wellhead, which solves the problem of a single heat insulation effect and a low heat insulation effect of the prior art on the wellhead.

[0007] (II) Technical solutions

[0008] In order to achieve the above object, the present application provides the following technical scheme: a double-layer heat-insulating gas injection well head, 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; the upper pipe sleeve and the lower pipe sleeve are both arranged in a double-layer structure, and are respectively provided with an upper pipe cavity and a lower pipe cavity in the inside, the upper pipe sleeve and the lower pipe sleeve are fixedly connected through a plurality of bolts, and the upper pipe cavity and the lower pipe cavity are in communication with each other; heat-insulating fluid is arranged in the inside of the upper pipe cavity and the lower pipe cavity; a heat-insulating auxiliary mechanism is used for providing flowing liquid to insulate and protect the upper pipe sleeve and the lower pipe sleeve; the heat-insulating auxiliary mechanism comprises a power assembly, a flowing assembly and a cooling liquid flowing assembly; the power assembly is used for providing liquid flowing power; the flowing assembly is used for providing a flowing loop to circulate the heat-insulating fluid in the inside of the upper pipe cavity and the lower pipe cavity; and the cooling liquid flowing assembly is used for providing cooling liquid to flow and cool the control valves.

[0009] Preferably, the power assembly comprises a driving blade, the driving blade is located in the inside of the main pipeline, the fluid flowing in the inside of the main pipeline will drive the driving blade to rotate, a driving shaft is fixedly connected to the driving blade, the driving shaft penetrates through the main pipeline and is fixedly connected with a flowing blade, the main pipeline is provided with a connecting sleeve pipe, the flowing blade is located in the inside of the sleeve pipe, pipe lines are connected to the left and right ends of the sleeve pipe, and the two pipe lines are respectively in communication with the upper pipe cavity and the lower pipe cavity, and the upper pipe cavity, the lower pipe cavity, the sleeve pipe and the two pipe lines form a closed loop.

[0010] Preferably, the pipe sleeve comprises an outer pipe, a partition pipe and an inner pipe, a cavity one is formed between the outer pipe and the partition pipe, a cavity two is formed between the partition pipe and the inner pipe, a cavity three is arranged in the inside of the inner pipe, nitrogen is arranged in the inside of the cavity two, and a gas injection pipe is connected to the cavity two.

[0011] Preferably, the flowing assembly comprises a crank shaft, the crank shaft is fixed to the end face of the driving shaft, a movement connecting rod is rotatably connected to the crank shaft, a sliding piston is rotatably connected to the bottom of the movement connecting rod, a sliding pipe is slidably connected to the surface of the sliding piston, the sliding pipe is connected to the outer pipe, a liquid pipe is connected to the bottom of the sliding pipe, an upper connecting pipe is in communication with the bottom of the liquid pipe, the upper connecting pipe is in communication with the upper pipe cavity, a drainage pipe and a return pipe are in communication with the cavity one, the bottom of the drainage pipe is in communication with the liquid pipe, and the bottom of the return pipe is in communication with the lower pipe cavity.

[0012] Preferably, one-way valves are arranged in the inside of the drainage pipe and the return pipe, upward movement of the sliding piston will suck the heat-insulating fluid in the inside of the upper pipe cavity into the inside of the liquid pipe through the upper connecting pipe, and downward movement of the sliding piston will extrude the heat-insulating fluid in the inside of the liquid pipe to flow back to the inside of the lower pipe cavity through the loop of the drainage pipe, the cavity one and the return pipe.

[0013] Preferably, the temperature control assembly comprises a heating module arranged in the cavity I, and the heating module is used for controlling the temperature of the heat insulation fluid to be within a set value.

[0014] Preferably, the cooling assembly comprises cooling liquid arranged in the cavity III, and the cavity III is connected with pipes at two ends, respectively, the control valve is provided with a plurality of flow cavities, the pipes and the flow cavities in the control valve are communicated to form a closed loop, the inner tube is provided with an intermediate sleeve, the intermediate sleeve is provided with a right opening and a left opening at left and right sides, and the inner tube is provided with a spiral blade and a liquid inlet and a liquid outlet at left and right sides.

[0015] Preferably, the flow control assembly comprises a heat pipe, the heat pipe is arranged in the main pipe, the heat pipe is slidably connected with a temperature and pressure sliding piece, the heat pipe is provided with a heat conducting piece, one end of the heat conducting piece extends into the main pipe to conduct heat of the high-temperature fluid in the main pipe, the heat pipe is provided with expanded gas, the temperature and pressure sliding piece is connected with a pressure spring at one side, the temperature and pressure sliding piece is connected with two guide rods at one side, one end of the guide rod is connected with a flow guide plate, and the two flow guide plates are slidably connected in the left opening and the right opening, respectively.

[0016] Preferably, the heat pipe is connected with a transparent display pipe, and the transparent display pipe is provided with a scale line.

[0017] (Three) beneficial effects

[0018] Compared with the prior art, the double-layer heat insulation gas injection well head has the following beneficial effects:

[0019] 1. The double-layer heat insulation gas injection well head can connect the cavities in the inner and outer pipes into one cavity, and then realize loop circulation by controlling the flow of the heat insulation fluid, so compared with the traditional fixed heat insulation material wrapping, the heat insulation structure can realize effective flow of the heat insulation fluid, realize heat insulation, effectively insulate the temperature of the well head by using the characteristics of flow, can ensure that the temperature of the well head pipe does not increase with the increase of the internal temperature, and can avoid the radiation of the internal heat to the outer pipe, realize effective temperature control and heat insulation, and improve the safety of the well head.

[0020] 2、The double-layer heat-insulating gas injection well head can flow cooling and temperature reduction for multiple valves through the flow cooling liquid, avoids high temperature radiation from the well head to the inside of the control valve, reduces the sealing performance of the control valve and the flow control capacity, and further improves the use safety of the well head from the side.

[0021] 3、The double-layer heat-insulating gas injection well head can automatically control the flow rate of the cooling through the flow control assembly, and when the internal temperature of the well head is higher, the flow rate of the cooling liquid and the heat-insulating fluid in the inside is accelerated, so that the rapid cooling and the rapid flow of the heat-insulating fluid are realized, so that the temperature and the flow rate have a positive relationship, and the heat-insulating effect and the cooling effect are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The overall structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0023] Figure 2 The connection structure schematic diagram of the upper pipe sleeve and the lower pipe sleeve of the double-layer heat-insulating gas injection well head is provided.

[0024] Figure 3 The heat-insulating auxiliary mechanism structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0025] Figure 4 The sliding piston connection structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0026] Figure 5 The flow control assembly structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0027] Figure 6 The pipe sleeve structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0028] Figure 7 The upper pipe sleeve cross-section structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0029] Figure 8 The lower pipe sleeve cross-section structure schematic diagram of the double-layer heat-insulating gas injection well head is provided.

[0030] In the figure: 1, main pipe; 2, upper pipe sleeve; 21, upper pipe cavity; 3, lower pipe sleeve; 31, lower pipe cavity; 4, branch pipe; 5, heat insulation auxiliary mechanism; 501, outer pipe; 502, partition pipe; 503, inner pipe; 504, intermediate sleeve; 505, liquid inlet; 506, liquid outlet; 507, helical blade; 508, driving blade; 509, driving shaft; 510, flow blade; 511, crank shaft; 512, sliding piston; 513, movement 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 conduction piece; 522, heat transfer pipe; 523, temperature-pressure sliding piece; 524, pressure spring; 525, guide rod; 526, flow guide plate; 527, transparent display pipe; 6, control valve. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] Please refer to Figures 1-8The utility model provides a double -layer heat -insulated gas well head, including main pipeline 1, upper pipe sleeve 2, lower pipe sleeve 3, be provided with a plurality of branch pipe 4 on main pipeline 1, be provided with control valve 6 on branch pipe 4, upper pipe sleeve 2 and lower pipe sleeve 3 are all set up double -layer structure, and are respectively provided with upper pipe cavity 21 and lower pipe cavity 31 in, upper pipe sleeve 2 and lower pipe sleeve 3 are fixedly connected through a plurality of bolts, and upper pipe cavity 21 and lower pipe cavity 31 are communicated with each other, by the upper pipe sleeve 2 and lower pipe sleeve 3 set up the double -layer structure of can communicate, can communicate the cavity in the inside into a cavity, then through the control flow of heat -insulating fluid realizes loop circulation, so compared with the traditional fixed heat -insulating material package, this kind of temperature -insulated structure can realize the effective flow of heat -insulating fluid, realizes temperature -insulated, utilizes the feature of flow to effectively insulate the temperature of well head, can guarantee that the pipeline temperature of well head does not along with the temperature of inside improves, produces heat loss upper pipe cavity 21 and lower pipe cavity 31 are provided with heat -insulating fluid in, heat -insulating auxiliary mechanism 5 is used to provide flowing liquid and carries out temperature -insulated protection to upper pipe sleeve 2 and lower pipe sleeve 3, heat -insulating auxiliary mechanism 5 includes power assembly, flow assembly and cooling liquid flow assembly, power assembly is used to provide liquid flow power, flow assembly is used to provide flow loop and carries out circulation flow to the heat -insulating fluid in the inside of upper pipe cavity 21 and lower pipe cavity 31, cooling liquid flow assembly is used to provide cooling liquid and carries out flow cooling to control valve 6, and the selection of heat -insulating fluid can select according to the temperature of each well head, can be cooling water directly, also can be silicone liquid, and the silicone liquid is a kind of high-temperature stable heat -insulating liquid with good performance, has excellent heat conduction performance and corrosion resistance. Silicone liquid is usually composed of polydimethylsiloxane PDMS and silicone resin, with high temperature stability and oxidation resistance. Silicone liquid is mainly used in high-temperature equipment, electronic components and optical instruments, with excellent heat insulation performance and stability.

[0033] In the embodiment, the power assembly includes a drive blade 508 located inside the main pipeline 1. When the fluid flows inside the main pipeline 1, it will drive the drive blade 508 to spin. The drive blade 508 is fixedly connected to a drive shaft 509, which passes through the main pipeline 1 and is fixedly connected to a flow blade 510. The main pipeline 1 is connected to a sleeve through a connector. The flow blade 510 is located inside the sleeve. The left and right ends of the sleeve are connected to two pipelines, which are respectively connected to 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. When the gas flows from the inside of the main pipeline 1, it will drive the rotation of the drive blade 508 through the flow of the fluid. The rotation of the drive blade 508 will synchronously drive the rotation of the drive shaft 509, and further drive the rotation of the crank shaft 511. Therefore, the overall power comes from the flow inside the well, which provides rotational power through the fluid flow in the well without adding electrical elements.

[0034] Further, the sleeve comprises an outer tube 501, a partition tube 502 and an inner tube 503, a cavity one is formed between the outer tube 501 and the partition tube 502, a cavity two is formed between the partition tube 502 and the inner tube 503, a cavity three is arranged inside the inner tube 503, nitrogen is arranged inside the cavity two, and a gas injection pipe is connected to the cavity two. The nitrogen consumption can be supplemented by the gas injection pipe, and the nitrogen concentration inside does not need to be too high, as long as the low-temperature environment generated inside can effectively cool the cooling liquid and the heat insulation liquid. The nitrogen is in the middle layer, and is radiated to the pipelines of the cooling liquid and the heat insulation liquid upward and downward, so that the radiative cooling is realized.

[0035] Further, the flow assembly comprises a crank shaft 511 fixed to the end face of the driving shaft 509, a movement connecting rod 513 rotatably connected to the crank shaft 511, a sliding piston 512 rotatably connected to the bottom of the movement connecting rod 513, a sliding pipe 514 slidably connected to the surface of the sliding piston 512, the sliding pipe 514 being connected to the outer tube 501, a liquid pipe 515 connected to the bottom of the sliding pipe 514, an upper connecting pipe 516 communicated to the bottom of the liquid pipe 515, the upper connecting pipe 516 being communicated to the upper tube cavity 21, a drainage pipe 517 and a return pipe 518 communicated to the cavity one, the bottom of the drainage pipe 517 being communicated to the liquid pipe 515, and the bottom of the return pipe 518 being communicated to the lower tube cavity 31. The rotation of the crank shaft 511 drives the movement connecting rod 513 to pull upward and downward, and then drives the sliding piston 512 to move upward and downward, so that a negative pressure suction force is generated by the sliding principle of the piston, the heat insulation fluid in the upper tube cavity 21 is sucked through the upper connecting pipe 516, and then is sucked into the liquid pipe 515, and then the fluid in the liquid pipe 515 is extruded to be injected into the cavity one through the drainage pipe 517, and then flows back to the lower tube cavity 31 through the return pipe 518, so that the heat insulation fluid forms a circulating flow loop. At this time, the heat insulation fluid flowing through the radiative low-temperature area of the nitrogen will be cooled, so that the temperature of the heat insulation fluid is always kept in a constant temperature state, and the heat insulation effect is kept in a constant state.

[0036] In addition, one-way valves are arranged in the drainage pipe 517 and the return pipe 518, the heat insulation fluid in the upper tube cavity 21 is sucked into the liquid pipe 515 through the upper connecting pipe 516 when the sliding piston 512 moves upward, and the heat insulation fluid in the liquid pipe 515 is extruded to flow back to the lower tube cavity 31 through the loop of the drainage pipe 517, the cavity one and the return pipe 518 when the sliding piston 512 moves downward. The one-way valves can control the one-way flow of the fluid, so that the "suction and discharge" are realized, and the flow loop is formed.

[0037] In addition, the cooling assembly comprises cooling liquid arranged in the cavity three, both ends of the cavity three are connected with pipes, the control valve 6 is provided with a plurality of, and the inside of a plurality of control valve 6 is provided with flow cavity, the pipe is communicated with the inside flow cavity of a plurality of control valve 6, forms closed loop, the inside of the inner tube 503 is provided with the intermediate sleeve 504, the right opening 519 and the left opening 520 are opened in the left and right sides of the intermediate sleeve 504, the inner tube 503 is provided with the spiral blade 507, the liquid inlet 505 and the liquid outlet 506 are opened in the left and right sides of the inner tube 503.When the driving shaft 509 rotates, the flow vane 510 will be driven to rotate synchronously, and then the rotation suction force will be rotated, and the fluid in the pipeline of the control valve 6 will be sucked, and then the cooling liquid will be arranged from the liquid inlet 505 to the inside of the inner tube 503, and then discharged from the liquid outlet 506, and then returned to the inside of the control valve 6 through the pipeline, and the flow cooling of the control valve 6 is carried out through the pipeline series connection, so as to avoid the influence of high temperature on the opening and closing effect of the control valve 6, improve the service life of the equipment, and improve the use stability of the wellhead.

[0038] It is worth noting that the flow control assembly is also included, the flow control assembly comprises a heat pipe 522, the heat pipe 522 is installed in the inside of the main pipe 1, the heat pipe 522 is slidably connected with a temperature and pressure sliding piece 523, the heat pipe 522 is provided with a heat conducting piece 521, one end of the heat conducting piece 521 extends to the inside of the main pipe 1, for heat conduction of the high temperature fluid of the main pipe 1, the heat pipe 522 is provided with an expanded gas, one side of the temperature and pressure sliding piece 523 is connected with a pressure spring 524, one side of the temperature and pressure sliding piece 523 is connected with two guide rods 525, one end of the guide rod 525 is connected with a flow guide plate 526, two flow guide plates 526 are slidably connected in the left opening 520 and the right opening 519.When the high temperature gas flow in the main pipe 1 is high, the heat will be conducted out to the inside of the heat pipe 522 through the heat conducting piece 521, so that the expanded gas in the heat pipe 522 is hot and expanded, and the gas after hot expansion will push the temperature and pressure sliding piece 523 to move backward, and then drive the two guide rods 525 to move, and the movement of the guide rod 525 will drive the two flow guide plates 526 to slide from the inside of the left opening 520 and the right opening 519, so as to limit the caliber size of the left opening 520 and the right opening 519, so the cooling liquid is arranged with the small opening, the rotating speed of the driving shaft 509 and the flow vane 510 will be faster, the flow rate of the cooling liquid will be accelerated at this time, and the rotation of the driving shaft 509 will be accelerated, and the rotation speed of the crankshaft 511 driven by the driving shaft 509 will be accelerated, and the same reason for the heat insulation fluid, the suction speed will also be accelerated, so as to improve the flow speed of the cooling liquid and the heat insulation fluid, to cope with the higher temperature wellhead flow.

[0039] It is worth mentioning that the heat pipe 522 is connected with a transparent display pipe 527, and the transparent display pipe 527 is provided with a scale line. The transparent display pipe 527 can intuitively display the sliding distance of the temperature and pressure sliding piece 523, provide data reference for subsequent operators, and then control the gas injection flow of the control valve 6. The inside of the cavity two is filled with nitrogen, and the nitrogen is used for radiating the cooling liquid and the heat insulation fluid. Through the setting of the nitrogen, the low temperature can be radiated to the cooling liquid and the heat insulation liquid, the temperature of the cooling liquid and the heat insulation liquid is controlled, and the wellhead device is cooled at the same time, so that the service life and the use stability of the equipment are improved.

[0040] The working principle is that when the whole wellhead is in use, the gas flow from the inside of the main pipeline 1 will drive the rotation of the driving blade 508 through the flow of fluid, and 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, which will drive the up-and-down pulling of the moving connecting rod 513, and then drive the up-and-down position of the sliding piston 512. By using the principle of piston sliding, negative pressure suction will be generated to suck the heat-insulating fluid in the upper pipe cavity 21 through the upper connecting pipe 516, and then suck into the inside of the liquid pipe 515. After the sliding piston 512 moves downward, the fluid in the liquid pipe 515 will be squeezed and injected into the position inside the cavity one from the drainage pipe 517, and then flow back to the inside of the lower pipe cavity 31 from the return pipe 518. Therefore, at this time, the heat-insulating fluid will form a circulating flow loop, and the inside of the cavity two is provided with nitrogen. Because of the low-temperature characteristics of nitrogen, it can cool the heat-insulating fluid and the cooling liquid. If the heat-insulating fluid is heated due to the high-temperature radiation inside the wellhead, the heat-insulating effect will be reduced, and the temperature of the wellhead outside will be increased. At this time, the flowing heat-insulating fluid will be cooled by the low-temperature radiation of nitrogen, so as to keep the temperature of the heat-insulating fluid in a constant temperature state, and ensure that the heat-insulating effect is in a constant state. The heat-insulating effect will not be reduced due to high-temperature environment, and the pipeline of the wellhead will be effectively cooled to avoid heat damage to the wellhead and improve the stability of the wellhead operation. Moreover, the whole device is also provided with cooling liquid to cool the control valve 6. When the driving shaft 509 rotates, it will synchronously drive the rotation of the flow blade 510, and then rotate the suction force to suck the fluid in the pipeline of the multiple control valves 6 in series. Then, the cooling liquid enters the inside of the inner pipe 503 from the liquid inlet 505, and then is discharged from the liquid outlet 506 and flows back to the inside of the control valve 6 from the pipeline. The multiple control valves 6 are cooled in series through the pipeline to avoid the influence of high temperature on the opening and closing effect of the control valve 6, improve the service life of the device, and improve the stability of the wellhead.The whole device is also provided with a flow control component, the purpose is to automatically control the flow rate of cooling liquid and heat insulation fluid, because if the flow rate is too slow, the high temperature radiation speed is faster, which will cause the heat to be radiated to the heat insulation material and the control valve 6, and the slow flow of the cooling liquid will not be able to keep up with the radiation speed of the high temperature, so the flow control component is set to automatically control the flow rate, specifically, when the internal high temperature gas flow of the main pipe 1 is high, the heat will be radiated to the inside of the heat pipe 522 through the heat conduction sheet 521, and then the internal expansion gas of the heat pipe 522 will be expanded, and the gas after thermal expansion will push the temperature and pressure slide 523 to move backward, and then drive the two guide rods 525 to move, and the movement of the guide rod 525 will drive the two guide plates 526 to slide from the inside of the left opening 520 and the right opening 519, so as to limit the caliber size of the left opening 520 and the right opening 519, so at this time the cooling liquid is set with the small opening change, the rotation speed of the flow blade 510 driven by the driving shaft 509 will be faster, at this time the flow rate of the cooling liquid will be accelerated, and the rotation of the driving shaft 509 will be accelerated, and the rotation speed of the crankshaft 511 driven by the driving shaft 509 will be accelerated, at this time the heat insulation fluid is the same, the suction speed will also be accelerated, so as to improve the flow rate of the cooling liquid and the heat insulation fluid, to cope with the higher temperature wellhead flow. Secondly, there is another way to reduce the flow opening of the main pipe 1 through the control valve 6, at this time the caliber of the gas flow from the main pipe 1 will be small, so the flow rate of the fluid will be accelerated, and then the high speed rotation of the driving blade 508 from the source will control the high speed rotation of the flow blade 510, so as to produce the same acceleration flow effect.

[0041] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another same element in the process, method, article or device including the element.

Claims

1. A double insulated gas injection wellhead, characterized in that Include: The main pipeline (1); Upper sleeve (2); Lower sleeve (3); The main pipeline (1) is provided with a plurality of branch pipes (4), the branch pipe (4) is provided with a control valve (6); The upper sleeve (2) and the lower sleeve (3) are provided with upper sleeve cavity (21) and lower sleeve cavity (31) respectively, the upper sleeve (2) and the lower sleeve (3) are fixedly connected by a plurality of bolts, the upper sleeve cavity (21) and the lower sleeve cavity (31) are communicated with each other; The upper sleeve cavity (21) and the lower sleeve cavity (31) are provided with heat insulation fluid; Heat insulation auxiliary mechanism (5) for providing flowing liquid to the upper sleeve (2) and the lower sleeve (3) for temperature protection; The heat insulation auxiliary mechanism (5) includes a power assembly, a flow assembly and a cooling liquid flow assembly; The power assembly is used for providing liquid flow power; The flow assembly is used for providing flow loop to the internal heat insulation fluid of the upper sleeve cavity (21) and the lower sleeve cavity (31) for circulating flow; The cooling liquid flow assembly is used for providing cooling liquid to the control valve (6) for flow cooling.

2. A double insulated gas wellhead according to claim 1, characterized in that: The power assembly includes a drive blade (508), the drive blade (508) is located in the inside of the main pipeline (1), the fluid flow in the inside of the main pipeline (1) will drive the drive blade (508) to rotate, the drive blade (508) is fixedly connected with the drive shaft (509), the drive shaft (509) penetrates the main pipeline (1) and is fixedly connected with the flow blade (510), the main pipeline (1) is connected with the sleeve pipe through the connecting piece, the flow blade (510) is located in the inside of the sleeve pipe, the left and right ends of the sleeve pipe are connected with the pipeline, and the two pipeline are communicated with the upper sleeve cavity (21) and the lower sleeve cavity (31) respectively, the upper sleeve cavity (21), the lower sleeve cavity (31), the sleeve pipe and the two pipeline form a closed loop.

3. A double insulated gas wellhead according to claim 2, characterised in that: The sleeve includes an outer tube (501), a partition tube (502) and an inner tube (503), the cavity one is formed between the outer tube (501) and the partition tube (502), the cavity two is formed between the partition tube (502) and the inner tube (503), the cavity three is arranged in the inner tube (503), the cavity two is provided with nitrogen, and the cavity two is connected with the gas injection pipe.

4. A double insulated gas wellhead according to claim 3, characterised in that: The flow assembly comprises a crank shaft (511) fixed on the end face of the drive shaft (509), a movement connecting rod (513) rotatably connected to the crank shaft (511), a sliding piston (512) rotatably connected to the bottom of the movement connecting rod (513), a sliding pipe (514) slidably connected to the surface of the sliding piston (512), the sliding pipe (514) connected with the outer pipe (501), a liquid pipe (515) connected to the bottom of the sliding pipe (514), an upper connecting pipe (516) in communication with the bottom of the liquid pipe (515), the upper connecting pipe (516) in communication with the upper pipe cavity (21), a drainage pipe (517) and a return pipe (518) in communication with the upper pipe cavity (21), the bottom of the drainage pipe (517) in communication with the liquid pipe (515), and the bottom of the return pipe (518) in communication with the lower pipe cavity (31).

5. A double insulated gas wellhead according to claim 4, characterised in that: The inside of the drainage pipe (517) and the return pipe (518) is provided with a one-way valve, the upward movement of the sliding piston (512) will suck the heat insulation fluid in the upper pipe cavity (21) into the inside of the liquid pipe (515) through the upper connecting pipe (516), and the downward movement of the sliding piston (512) will extrude the heat insulation fluid in the inside of the liquid pipe (515) to flow back to the inside of the lower pipe cavity (31) through the return circuit of the drainage pipe (517), the cavity one and the return pipe (518).

6. A double insulated gas wellhead according to claim 3, characterized in that: The cooling assembly comprises cooling liquid arranged in the inside of the cavity three, a plurality of control valves (6) provided and each provided with a flow cavity, the pipeline in communication with the flow cavities in the inside of the plurality of control valves (6) to form a closed loop, the inside of the inner pipe (503) is provided with an intermediate sleeve (504), the right opening (519) and the left opening (520) are formed on the left and right sides of the intermediate sleeve (504), the inner pipe (503) is provided with a spiral blade (507), and the inner pipe (503) is provided with a liquid inlet (505) and a liquid outlet (506) on the left and right sides.

7. A double insulated gas wellhead according to claim 6, characterised in that: The flow control assembly comprises a heat pipe (522) installed in the inside of the main pipeline (1), a temperature and pressure sliding blade (523) slidably connected to the inside of the heat pipe (522), a heat conducting fin (521) arranged in the heat pipe (522), one end of the heat conducting fin (521) extending to the inside of the main pipeline (1) for heat conduction of the high-temperature fluid in the main pipeline (1), expansion gas arranged in the inside of the heat pipe (522), a pressure spring (524) connected to one side of the temperature and pressure sliding blade (523), two guide rods (525) connected to one side of the temperature and pressure sliding blade (523), and guide plates (526) connected to one end of the guide rods (525), the two guide plates (526) slidably connected in the left opening (520) and the right opening (519).

8. A double insulated gas wellhead according to claim 7, characterised in that: The heat pipe (522) is connected with a transparent display pipe (527), and the transparent display pipe (527) is provided with scale lines.

9. A double insulated gas wellhead according to claim 7, characterized in that: The inside of the cavity two is filled with nitrogen, and the nitrogen is used for radiative cooling of the cooling liquid and the heat insulation fluid.

Images