CN113047822A - Steam injection system and steam huff and puff system with same - Google Patents

Abstract

The invention provides a steam injection system and a steam huff and puff system with the same, wherein the steam injection system injects steam for a steam huff and puff well, and the steam injection system comprises: the steam injection device comprises a steam injection pipe and a short section assembly connected with the steam injection pipe, the short section assembly is positioned in the horizontal section, a steam injection hole and a plurality of adjusting hole groups are arranged on the short section, and the sliding sleeve assembly can shield the plurality of adjusting hole groups; adjusting device, including removable the regulation oil pipe that sets up in the steam injection pipe, set up power device on the first end of adjusting oil pipe and set up the regulator on the second end of adjusting oil pipe, the regulator includes the body and movably slider that sets up on the body, adjusting device still includes the regulation passageway that runs through the body, and the radial exit at the regulation passageway is established to the slider lid, and wherein, the slider has stretching out position and withdrawal position. The technical scheme of this application has solved effectively and has adjusted the hole number in steam injection hole through rotatory governing valve among the correlation technique to make the problem of hydraulic pressure pipeline easy damage.

Description

Steam injection system and steam huff and puff system with same

Technical Field

The invention relates to the field of oil exploitation, in particular to a steam injection system and a steam huff and puff system with the same.

Background

For the exploitation of heavy oil and ultra-heavy oil in an oil field, a steam huff and puff process and an SAGD (steam assisted gravity drainage) process are mainly used for exploitation, in recent years, in a conventional steam huff and puff horizontal well and an SAGD well, the mode that a plurality of steam injection short circuits are arranged in a horizontal section is adopted to realize the uniform steam injection in the horizontal section, but the working condition of a thermal production well shaft is complex, and meanwhile, the physical property of an oil layer is uneven, so that the uniform steam injection process is adopted but the uniform steam injection cannot be realized.

In the uniform steam injection technology in the related technology, a steam injection system comprises a hydraulic pump, a wellhead device, an oil pipe, a hydraulic pipeline arranged in the oil pipe and a plurality of regulating valves connected with the hydraulic pipeline, wherein the hydraulic pump, the wellhead device, the oil pipe, the hydraulic pipeline and the regulating valves are sequentially arranged in a horizontal section from the ground to an oil layer. Wherein, hydraulic line wears to establish in the wellhead assembly, and the wellhead assembly can seal hydraulic line, governing valve and hydraulic pump connection. After steam injection and stewing for the first time, temperature and pressure of different positions of the horizontal section are tested by the underground temperature monitoring system, and then the adjusting valves of different positions of the horizontal section are adjusted by the hydraulic pump on the ground, so that the adjusting valves rotate, the number of holes of steam injection holes can be adjusted, and steam injection is uniform.

However, due to the complex working environment at the bottom of the well, the hydraulic pipeline can rotate, strain and be damaged under severe working conditions. At the moment, the number of holes of the steam injection hole is adjusted through the rotary adjusting valve, so that the hydraulic pipeline can be continuously damaged, the sealing effect between oil pipes cannot be guaranteed, and further the hydraulic control system fails. In the steam injection system, a hydraulic pump, a wellhead device, an oil pipe, a hydraulic pipeline and a regulating valve are required to be used in a set, the application occasion is single, and the steam injection system is required to use the oil pipe with a special structure, so that the whole process has higher manufacturing cost and is more troublesome to maintain.

Disclosure of Invention

The invention mainly aims to provide a steam injection system and a steam huff and puff system with the same, and aims to solve the problem that in the related art, the number of holes of a steam injection hole is adjusted by rotating an adjusting valve, so that a hydraulic pipeline is easy to damage.

To achieve the above object, according to one aspect of the present invention, there is provided a steam injection system for injecting steam into a steam huff-and-puff well, the steam huff-and-puff well including a vertical section and a horizontal section, the steam injection system including: the steam injection device comprises a steam injection pipe and a short section assembly connected with the steam injection pipe, wherein the short section assembly is positioned in a horizontal section and comprises a plurality of short sections and a plurality of sliding sleeve assemblies movably arranged in the short sections in a penetrating manner, the short sections and the sliding sleeve assemblies are arranged in a one-to-one correspondence manner, the short sections are provided with steam injection holes and a plurality of adjusting hole groups arranged at intervals along the axial direction of the short sections, each adjusting hole group comprises one or a plurality of adjusting holes, and the sliding sleeve assemblies can shield the adjusting hole groups; adjusting device, including removing the regulation oil pipe that sets up in the steam injection pipe, the power device of setting on the first end of adjusting oil pipe and the regulator of setting on the second end of adjusting oil pipe, the regulator includes body and the movably slider that sets up on the body, adjusting device is still including the regulation route that runs through the body, the radial exit at regulation route is established to the slider lid, wherein, the slider has extended position and withdrawal position, when the slider is in the withdrawal position, the regulator can remove in the sliding sleeve subassembly, when the slider is in the extension position, slider drive sliding sleeve subassembly removes in the nipple joint, in order to adjust the group number with the regulation punch combination of steam injection pipe intercommunication.

Further, the nipple joint subassembly is still including setting up the first spacing portion on the inner wall of nipple joint, and when first spacing portion contacted with the first end of sliding sleeve subassembly, the sliding sleeve subassembly sheltered from steam injection hole and a plurality of regulation punch combination.

Further, the sliding sleeve component comprises a sliding sleeve, a stop ring connected with the sliding sleeve and a first elastic part connected with the stop ring, the short section component further comprises a blocking barrel arranged in the second end of the short section in a penetrating mode, the blocking barrel comprises a barrel body and a first blocking ring arranged on the barrel body, the first elastic part can be sleeved outside the barrel body and matched with the first blocking ring in a blocking mode, a plurality of first annular grooves are formed in the inner wall of the short section, the stop ring can be limited in any first annular groove, a second annular groove avoiding the barrel body is formed in the sliding sleeve, and a first limiting portion is arranged at the first end of the short section.

Furthermore, the inner hole of the sliding sleeve comprises a first hole section, a second hole section and a third hole section which are connected in sequence, the diameter of the second hole section is smaller than that of the first hole section and that of the third hole section, the inner hole of the cylinder body comprises a fourth hole section, a fifth hole section and a sixth hole section which are connected in sequence, the diameter of the sixth hole section is smaller than that of the fourth hole section and that of the fifth hole section, the diameter of the second hole section is equal to or smaller than that of the sixth hole section, when the sliding block is at the retraction position, the outer diameter of the regulator is smaller than the diameter of the second hole section, when the sliding block is in the extending position, the regulator is positioned in the first hole section, the side wall of the sliding block can be matched with the first end of the sliding sleeve in a stop way, or, when the number of groups of the adjusting hole groups communicated with the steam injection pipe is reduced and the slide block is at the extending position, the regulator is located the fourth hole section, and the lateral wall of slider can be with the second end backstop cooperation of sliding sleeve.

Further, the regulator still includes the limit structure who is connected with the first end of body and the guide part of being connected with the second end of body, forms spacing space between limit structure and the guide part, and the slider is located spacing space, and a part of slider can bulge spacing space.

Further, the body includes the axial body, set up radial body on the axial body and set up the second elastic component in radial body, adjust the route including the first intercommunicating pore that is located radial body and diameter are greater than first intercommunicating pore, form first step face between first intercommunicating pore and the second intercommunicating pore, the slider includes slider body and the spout that sets up on slider body, spout and radial body clearance fit, the second elastic component is located the second intercommunicating pore and is located between the tank bottom of first step face and spout.

Further, the axial body includes the canned paragraph and the removal section of being connected with the canned paragraph movably through the third elastic component, the canned paragraph is including connecting gradually and the diameter is reduced gradually first section of thick bamboo, the second section of thick bamboo, third section of thick bamboo and fourth section of thick bamboo, form the second step face between third section of thick bamboo section and the fourth section of thick bamboo, the canned paragraph is still including setting up the second fender ring on the fourth section of thick bamboo, the removal section is including removing the section body and connecting the linkage segment on removing the section body, radial body sets up on removing the section body, be provided with the arch on the inner wall of linkage segment, the arch is including relative first terminal surface and the second terminal surface that sets up, wherein, first terminal surface and second step face can backstop cooperation, the third elastic component is spacing between second terminal surface and second fender ring.

Furthermore, the first end of the connecting section is connected with the moving section body, the second end sleeve of the connecting section is arranged on the third cylinder section, and the adjusting device further comprises a shear pin which is arranged in the second end of the connecting section and the third cylinder section in a shearing mode.

Further, the slider is the round platform form, and limit structure includes connecting portion and the spacing portion of second, and connecting portion are connected with the first end of body, is provided with the backstop inclined plane in the spacing portion of second, and when the slider moved to the extended position by the withdrawal position, the first end of slider protruded spacing space, and the second end and the backstop inclined plane backstop cooperation of slider.

Further, the steam injection system also includes a downhole temperature monitoring system removably disposed within the vertical section and the horizontal section.

Furthermore, the steam injection system also comprises a main gate arranged at the wellhead of the steam huff-puff well and a blowout preventer arranged on the main gate, and the blowout preventer is sleeved outside the adjusting oil pipe.

Further, the blowout preventer includes: the blowout preventer comprises a blowout preventer, a cross joint and a sealer which are sequentially connected from bottom to top, the steam injection system further comprises a gate and/or a plug flange connected in the cross joint, the power device comprises a pump truck and an oil pipe regulating truck connected with the pump truck, and the blowout preventer further comprises a supporting device positioned above the sealer to support the oil pipe regulating truck.

According to another aspect of the invention, a steam huff and puff system is provided, which comprises a steam injection system and an oil production system, wherein the steam injection system is the steam injection system, and the oil production system comprises an oil production pipe and an oil pump connected to the oil production pipe.

By applying the technical scheme of the invention, the steam injection system injects steam for the steam huff-puff well. The steam stimulation well includes a vertical section and a horizontal section. The steam injection system comprises: steam injection device and adjusting device. The steam injection device comprises a steam injection pipe and a short section assembly connected with the steam injection pipe, and the short section assembly is positioned in the horizontal section. The short section assembly comprises a short section and a sliding sleeve assembly movably arranged in the short section in a penetrating mode. The short section is provided with a steam injection hole and a plurality of adjusting hole groups which are arranged along the axial direction of the short section at intervals. Each set of adjustment holes includes one or more adjustment holes. The sliding sleeve assembly can shield a plurality of adjusting hole groups. The adjusting device comprises an adjusting oil pipe which is arranged in the steam injection pipe in a removable mode, a power device which is arranged on the first end of the adjusting oil pipe, and an adjuster which is arranged on the second end of the adjusting oil pipe. Therefore, the adjusting device and the steam injection device are two mutually independent devices, the adjusting device can be applied to different steam injection devices such as an SAGD system, the field operation is convenient, and the application occasions are more. The pipe body and the sliding block are simple in structure and easy to realize, and the sliding block can be easily moved relative to the pipe body by adjusting the pressure in the oil pipe through the power device. The regulator comprises a pipe body and a sliding block movably arranged on the pipe body. The adjusting device also comprises an adjusting passage penetrating through the tube body, and the sliding block cover is arranged at a radial outlet of the adjusting passage. In this application, the slider has an extended position and a retracted position, and the adjuster is movable within the slide sleeve assembly when the slider is in the retracted position. When the sliding block is in the extending position, the sliding block drives the sliding sleeve assembly to move in the short section so as to adjust the group number of the adjusting hole groups communicated with the steam injection pipe. Like this, the sliding sleeve subassembly can not drive when removing and annotate the steam pipe and remove or rotate together, just can adjust the group number with the regulation punch combination of annotating the steam pipe intercommunication through removing the sliding sleeve subassembly, realize the group number change of a plurality of regulation punch combination on every nipple joint, and then realize evenly annotating vapour in the horizontal segment, replaced in the correlation technique only can carry out the mode of adjusting through the hole number of rotatory governing valve to annotating the steam hole, the technical scheme of this application can not lead to the fact the damage to annotating the steam pipe at the in-process of realizing evenly annotating vapour like this. Therefore, the technical scheme of the application effectively solves the problem that the number of holes of the steam injection hole is adjusted through the rotary adjusting valve in the related technology so that the hydraulic pipeline is easy to damage.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a block diagram of an embodiment of a steam injection system according to the present invention;

FIG. 2 shows a schematic cross-sectional view of a regulator and sub assembly of the steam injection system of FIG. 1 in a horizontal section;

FIG. 3 shows a schematic cross-sectional view of the steam injection system of FIG. 2 with the spool and sliding sleeve assembly mated; and

FIG. 4 shows a schematic cross-sectional view of the steam injection system of FIG. 2 with the stop structure, regulator and guide mounted together.

Wherein the figures include the following reference numerals:

1. a vertical section; 2. a horizontal segment; 11. a steam injection pipe; 12. a short section; 121. a steam injection hole; 122. an adjustment hole; 123. a first ring groove; 13. a sliding sleeve assembly; 131. a sliding sleeve; 1311. a first bore section; 1312. a second bore section; 1313. a third bore section; 1314. a second ring groove; 132. a stop ring; 133. a first elastic member; 14. a first limiting part; 15. a blocking cylinder; 151. a barrel; 1511. a fourth bore section; 1512. a fifth bore section; 1513. a sixth bore section; 152. a first retainer ring; 16. a plug guide head; 17. a hanger; 21. adjusting an oil pipe; 22. a power plant; 221. a pump truck; 222. adjusting an oil pipe vehicle; 23. a regulator; 231. a pipe body; 2311. an axial tube body; 2312. a radial tube body; 2313. a second elastic member; 2314. a fixed section; 2315. a third elastic member; 2316. a moving section; 2317. a second retainer ring; 2318. a moving section body; 2319. a connecting section; 23191. a protrusion; 232. a slider; 2321. a slider body; 2322. a chute; 233. a regulating passage; 24. a limiting structure; 241. a connecting portion; 242. a second limiting part; 2421. a stop ramp; 25. a guide portion; 26. shearing the nails; 30. a main gate; 41. a lubricator; 42. four-way connection; 43. a sealer; 44. a support device; 50. a gate; 60. an oil recovery system; 61. a production string; 62. an oil pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 4, the steam injection system of the present embodiment injects steam for a steam huff well. The steam stimulation well comprises a vertical section 1 and a horizontal section 2. The steam injection system comprises: steam injection device and adjusting device. Steam injection device includes steam injection pipe 11 and the nipple joint subassembly of being connected with steam injection pipe 11, and the nipple joint subassembly is located horizontal segment 2. The nipple subassembly includes a plurality of nipples 12 and movably wears to establish a plurality of sliding sleeve subassemblies 13 in a plurality of nipples 12, and a plurality of nipples 12 set up with a plurality of sliding sleeve subassemblies 13 one-to-one. The nipple 12 is provided with a steam injection hole 121 and a plurality of adjusting hole groups which are arranged at intervals along the axial direction of the nipple 12. Each set of adjustment holes includes one or more adjustment holes 122. The sliding sleeve assembly 13 can block a plurality of adjustment hole sets. The adjusting means includes an adjusting oil pipe 21 removably provided in the steam injection pipe 11, a power unit 22 provided on a first end of the adjusting oil pipe 21, and an adjuster 23 provided on a second end of the adjusting oil pipe 21. The adjuster 23 includes a tube 231 and a slider 232 movably disposed on the tube 231. The regulating device further comprises a regulating passage 233 penetrating through the tubular body 231, and the slider 232 is covered at a radial outlet of the regulating passage 233. In this embodiment, the slider 232 has an extended position and a retracted position, and the adjuster 23 is movable within the slide assembly 13 when the slider 232 is in the retracted position. When the sliding block 232 is in the extended position, the sliding block 232 drives the sliding sleeve assembly 13 to move in the short section 12 so as to adjust the number of groups of adjusting holes communicated with the steam injection pipe 11.

By applying the technical scheme of the embodiment, the steam injection system comprises: steam injection device and adjusting device. The nipple 12 is provided with a steam injection hole 121 and a plurality of adjusting hole groups which are arranged at intervals along the axial direction of the nipple 12. Each set of adjustment holes includes one or more adjustment holes 122. The sliding sleeve assembly 13 can block a plurality of adjustment hole sets. The adjusting means includes an adjusting oil pipe 21 removably provided in the steam injection pipe 11, a power unit 22 provided on a first end of the adjusting oil pipe 21, and an adjuster 23 provided on a second end of the adjusting oil pipe 21. Therefore, the adjusting device and the steam injection device are two mutually independent devices, the adjusting device can be applied to different steam injection devices such as an SAGD system, the field operation is convenient, and the application occasions are more. The pipe 231 and the sliding block 232 are simple in structure and easy to implement, so that the sliding block 232 can easily move relative to the pipe 231 by adjusting the pressure in the oil pipe 21 by the power device. The adjuster 23 includes a tube 231 and a slider 232 movably disposed on the tube 231. The regulating device further comprises a regulating passage 233 penetrating through the tubular body 231, and the slider 232 is covered at a radial outlet of the regulating passage 233. In this embodiment, the slider 232 has an extended position and a retracted position, and the adjuster 23 is movable within the slide assembly 13 when the slider 232 is in the retracted position. When the sliding block 232 is in the extended position, the sliding block 232 drives the sliding sleeve assembly 13 to move in the short section 12 so as to adjust the number of groups of adjusting holes communicated with the steam injection pipe 11. Like this, sliding sleeve subassembly 13 can not drive when removing and annotate steam pipe 11 and remove or rotate together, just can adjust the group number with the regulation punch combination of annotating steam pipe 11 intercommunication through removing sliding sleeve subassembly 13, realize the group number change of a plurality of regulation punch combination on every nipple joint 12, and then realize evenly annotating vapour in horizontal segment 2, replaced the mode that only can adjust the hole number in steam injection hole through rotary regulating valve among the correlation technique, the technical scheme of this embodiment can not lead to the fact the damage to annotating the steam pipe at the in-process that realizes evenly annotating vapour like this. Therefore, the technical scheme of the embodiment effectively solves the problem that the number of holes of the steam injection hole is adjusted through rotating the adjusting valve in the related art, so that the hydraulic pipeline is easy to damage.

It should be noted that the plurality of adjustment holes 122 of the present embodiment are arranged at intervals along the circumferential direction of the sub 12.

As shown in fig. 2 to 4, in this embodiment, the short section assembly further includes a first limiting portion 14 disposed on an inner wall of the short section 12, and when the first limiting portion 14 contacts with the first end of the sliding sleeve assembly 13, the sliding sleeve assembly 13 blocks the steam injection hole 121 and the plurality of adjusting hole sets. The first limit part 14 can limit the moving position of the sliding sleeve assembly 13, and prevent the sliding sleeve assembly 13 from separating from the short section 12.

When a plurality of short sections 12 are put into the steam huff and puff well, a certain number of steam injection holes 121 are reserved between the first end of the sliding sleeve assembly 13 and the first limiting part 14, and are consistent with the production requirement of the horizontal section 2 of the thickened oil, so that the smooth operation of the first steam injection is ensured. When the number of groups of the adjusting hole groups communicated with the steam injection pipe 11 is increased, the sliding block 232 moves from the retracted position to the extended position and pushes the first end of the sliding sleeve assembly 13, so that the sliding sleeve assembly 13 moves forwards, and at least one group of adjusting holes 122 in the adjusting hole groups are communicated with the steam injection pipe 11, so that the number of the groups of the adjusting hole groups communicated with the steam injection pipe 11 is increased; when the number of groups of the adjusting hole groups communicated with the steam injection pipe 11 is reduced, the sliding block 232 moves from the retraction position to the extension position and pulls the second end of the sliding sleeve assembly 13, so that the sliding sleeve assembly 13 moves backwards, the first limiting part 14 is matched with the first end stop of the sliding sleeve assembly 13, the sliding block 232 moves from the retraction position to the extension position and pushes the first end of the sliding sleeve assembly 13, so that the sliding sleeve assembly 13 moves forwards, the sliding sleeve assembly 13 shields at least one group of adjusting holes 122 in the adjusting hole groups, and the number of groups of the adjusting hole groups communicated with the steam injection pipe 11 is reduced.

As shown in fig. 2 and 3, in the present embodiment, the sliding sleeve assembly 13 includes a sliding sleeve 131, a stop ring 132 connected to the sliding sleeve 131, and a first elastic member 133 connected to the stop ring 132. The sliding sleeve 131, the stopper ring 132 and the first elastic member 133 are integrally connected in sequence, and can move together. The short section assembly further comprises a blocking cylinder 15 penetrating through the second end of the short section 12, the blocking cylinder 15 comprises a cylinder body 151 and a first blocking ring 152 arranged on the cylinder body 151, and the first elastic part 133 can be sleeved outside the cylinder body 151 and matched with the first blocking ring 152 in a blocking manner. The catch 15 is attached to the inner wall of the second end of the nipple 12 by a threaded arrangement. The first stop ring 152 is arranged to restrain the first resilient member 133 within the nipple 12. When the sliding block 232 pushes the sliding sleeve 131 to move, the inner wall of the short section 12 is provided with a plurality of first ring grooves 123, and the stop ring 132 can be limited in any one of the first ring grooves 123. At this time, the sliding sleeve 131 can stay at a designated position to satisfy the number of sets of the regulating hole groups communicating with the steam injection pipe 11. The sliding sleeve 131 is provided with a second annular groove 1314 for avoiding the cylinder 151. The second annular groove 1314 is provided to prevent the sliding sleeve 131 from interfering with the catch 15 during movement. A first stop portion 14 is provided at a first end of the sub 12. The first elastic member 133 of the present embodiment is preferably a compression spring. The stop ring 132 is preferably a metal O-ring. Thus, the stopper ring 132 can function as a stopper on one hand and can function as a seal with the first annular groove 123 when the first elastic member 133 applies an elastic force to the stopper ring 132 on the other hand.

As shown in fig. 2 and 3, in the present embodiment, the inner bore of the sliding sleeve 131 includes a first bore section 1311, a second bore section 1312 and a third bore section 1313 connected in sequence, and the diameter of the second bore section 1312 is smaller than the diameter of the first bore section 1311 and the diameter of the third bore section 1313. The inner bore of the cylinder 151 includes a fourth bore segment 1511, a fifth bore segment 1512, and a sixth bore segment 1513 connected in series. The diameter of sixth bore segment 1513 is less than the diameter of fourth bore segment 1511 and the diameter of fifth bore segment 1512, and the diameter of second bore segment 1312 is equal to or less than the diameter of sixth bore segment 1513. With the slider 232 in the retracted position, the outer diameter of the adjuster 23 is less than the diameter of the second bore section 1312. Thus, the adjuster 23 can smoothly pass in or out of the sliding sleeve 131. In this embodiment, when the sliding block 232 is in the retracted position and moves within the sliding sleeve 131 and the cylinder 151, the bore diameters of the third bore sections 1313 of the first and second bore sections 1311, 1312 are not equal. Thus, the above-mentioned different apertures can avoid the interference between the adjuster 23 and the hole wall of the sliding sleeve 131. The pore sizes of the fourth, fifth and sixth pore sections 1511, 1512, 1513 are all unequal. Thus, the diameters of the holes are different from each other, and interference between the adjuster 23 and the hole wall of the cylinder 151 can be avoided.

In the present embodiment, as shown in fig. 2 and 3, when the sliding block 232 is in the extended position, the adjuster 23 is located in the first hole section 1311, and the side wall of the sliding block 232 can be engaged with the first end stop of the sliding sleeve 131, so that the sliding block 232 can push the sliding sleeve 131 to move relative to the short section 12. Alternatively, when the number of sets of adjustment holes communicating with the steam injection pipe 11 is reduced and the slider 232 is in the extended position, the adjuster 23 is located in the fourth hole section 1511, and the side wall of the slider 232 can be engaged with the second end stopper of the sliding sleeve 131. Thus, the adjuster 23 can pull the sliding sleeve 131 to move in the direction of the first stopper portion 14 (i.e., the direction of the left arrow in fig. 1) in preparation for increasing the number of sets of adjustment holes communicating with the steam injection pipe 11 or decreasing the number of sets of adjustment holes communicating with the steam injection pipe 11. The fourth bore segment 1511 can receive the regulator 23 to facilitate the slider 232 in the extended position.

As shown in fig. 4, in the present embodiment, the adjuster 23 further includes a stopper structure 24 connected to a first end of the tube 231 and a guide portion 25 connected to a second end of the tube 231. A limiting space is formed between the limiting structure 24 and the guide part 25, the sliding block 232 is positioned in the limiting space, and a part of the sliding block 232 can protrude out of the limiting space. The setting of spacing space can be restricted slider 232, prevents that when the partly spacing space that can bulge of slider 232, whole slider 232 does not deviate from body 231.

As shown in fig. 4, in the present embodiment, the pipe 231 includes an axial pipe body 2311, a radial pipe body 2312 disposed on the axial pipe body 2311, and a second elastic member 2313 disposed inside the radial pipe body 2312. The regulation passage 233 includes a first communication hole in the radial tube body 2312 and a second communication hole having a larger diameter than the first communication hole, and a first step surface is formed between the first communication hole and the second communication hole. The slider 232 includes a slider body 2321 and a sliding slot 2322 disposed on the slider body 2321, and the sliding slot 2322 is in clearance fit with the radial tube 2312. The clearance fit structure of the sliding block 232 and the sliding groove 2322 is simple, convenient to process and easy to realize. The second elastic member 2313 is located in the second communication hole and between the first step surface and the groove bottom of the sliding groove 2322. Thus, with the pressure relief of the adjustment passage 233, the second resilient member 2313 can apply a resilient force to the slider body 2321 to slide the slider body 2321 relative to the radial stem 2312 and into a retracted position. The second elastic member 2313 of the present embodiment is preferably a tension spring.

In this embodiment, a first sealing groove is disposed on the sidewall of the radial pipe body 2312, and the regulator 23 further includes a first sealing ring disposed in the first sealing groove to seal between the sidewall of the sliding groove 2322 and the outer wall surface of the radial pipe body 2312. The first seal ring of this embodiment is preferably an O-ring.

As shown in fig. 4, in the present embodiment, the axial tube body 2311 includes a fixed section 2314 and a moving section 2316 movably connected with the fixed section 2314 by a third elastic member 2315. The fixing section 2314 includes a first cylinder section, a second cylinder section, a third cylinder section and a fourth cylinder section which are connected in sequence and gradually decrease in diameter. A second step surface is formed between the third cylinder section and the fourth cylinder section, the fixing section 2314 further comprises a second stop ring 2317 arranged on the fourth cylinder section, and the moving section 2316 comprises a moving section body 2318 and a connecting section 2319 connected to the moving section body 2318. The radial pipe body 2312 is arranged on the moving section body 2318, the inner wall of the connecting section 2319 is provided with a protrusion 23191, the protrusion 23191 comprises a first end face and a second end face which are oppositely arranged, the first end face and the second step face can be in stop fit, and the third elastic piece 2315 is limited between the second end face and the second stop ring 2317. The third elastic member 2315 of the present embodiment is preferably a tension spring. The second stopper ring 2317 and the second step surface limit the moving range of the protrusion 23191 to prevent the moving section 2316 from being disengaged from the fixed section 2314. In the case where the regulation passage 233 is decompressed, the first end surface and the second step surface are brought into stop engagement by the elastic force of the third elastic member 2315.

In this embodiment, boss 23191 is further provided with a second seal groove, and regulator 23 further includes a second seal ring disposed within the second seal groove to seal between boss 23191 and the outer surface of the third barrel section. The second seal ring of this embodiment is preferably an O-ring.

As shown in fig. 4, in the present embodiment, the first end of the connection section 2319 is connected to the moving section body 2318, and the second end of the connection section 2319 is sleeved on the third cylinder section. The adjustment means further comprises a shear pin 26 shearably disposed through the second end of the connecting section 2319 and the third barrel section. Connecting section 2319 can be two axle bushes amalgamation together, connecting section 2319 with remove section body 2318 welded connection. The provision of shear pins 26 ensures that the moving segment body 2318 is maintained in a stop engagement position with the first and second step surfaces while the pressure within the regulating passage 233 is maintained at an initial value. When the pressure in the regulator passage 233 exceeds an initial value, the shear pins 26 shear to move the connecting section 2319 relative to the third barrel section.

As shown in fig. 4, in the present embodiment, the sliding block 232 is in a circular truncated cone shape, the limiting structure 24 includes a connecting portion 241 and a second limiting portion 242, the connecting portion 241 is connected to the first end of the tube 231, a stop inclined surface 2421 is disposed on the second limiting portion 242, when the sliding block 232 moves from the retracted position to the extended position, the first end of the sliding block 232 protrudes out of the limiting space, and the second end of the sliding block 232 is in stop fit with the stop inclined surface 2421. The stop inclined surface 2421 and the truncated cone-shaped structure make the regulator 23 simple in structure, convenient to match and easy to implement. The guiding portion 25 has a slope portion matching with the second end stop of the slider 232, and the outer surface of the guiding portion is tapered.

It should be noted that the adjuster 23 of the present embodiment is preferably of a symmetrical structure, so that when the sliding block 232 is in the extended position, a pushing force or a pulling force can be simultaneously applied to the sliding sleeve 131, so that the sliding block 232 moves more smoothly in the short section 12.

In this embodiment, the steam injection system further comprises a downhole temperature monitoring system removably disposed within the vertical section 1 and the horizontal section 2. According to the production requirement of the horizontal section 2 of the thickened oil, after a single well parameter is analyzed and calculated through an underground temperature monitoring system, steam is injected into the horizontal section 2 through steam injection holes 121 in a plurality of short sections 12, after steam is injected for stewing for the first time, the underground temperature monitoring system which is put into a steam huff-and-puff well can test the temperature and pressure of the horizontal section 2, a temperature curve in the horizontal section 2 is measured, the adjusting position of the steam injection quantity is determined according to the temperature curve, an adjusting device is put into the adjusting device to adjust one or a plurality of adjusting holes 122 of an adjuster 23, and the purpose of increasing or reducing the group number of adjusting hole groups communicated with a steam injection pipe 11 is achieved. It should be noted that, the technical application of the downhole temperature monitoring system can refer to the design and application of SAGD horizontal well multi-point temperature monitoring system on pages 45-48 in "petroleum technology in Xinjiang (authored by Xiao dao) at stage 2 of 2015.

It should be noted that the steam injection system of the present embodiment can also be applied to a double-pipe well.

As shown in fig. 1, in the present embodiment, the steam injection system further includes a main gate 30 disposed at a wellhead of the steam huff-and-puff well, and a blowout preventer disposed on the main gate 30, and the blowout preventer is sleeved outside the adjusting oil pipe 21. The blowout preventer prevents blowout of the steam huff-and-puff well when the downhole temperature monitoring system and/or the adjusting device is lowered into the steam huff-and-puff well.

As shown in fig. 1, in the present embodiment, the blowout preventer includes: the lubricator 41, the cross joint 42 and the sealer 43 are connected in sequence from bottom to top. The steam injection system further includes a gate 50 and/or a plug flange connected within the spool 42, the gate 50 and/or plug flange being capable of plugging the remaining outlets of the spool 42 to prevent leakage. The power device 22 includes a pump truck 221 and a regulating oil pipe truck 222 connected to the pump truck 221. The pump truck 221 and the adjustment/regulation oil pipe truck 222 can adjust the pressure of the gas flowing through the adjustment oil pipe 21. The blowout preventer further includes a support device 44 located above the sealer 43 to support the trim line 21. The support means 44 is preferably a trolley of a crane.

As shown in fig. 1, in this embodiment, the steam injection device further includes a hanger 17 connected to the steam injection pipe 11 and a plug guide 16 sealing an end of the steam injection pipe 11.

As shown in fig. 1 to 4, the technical solution of the present embodiment is operated by the following steps:

firstly, a steam injection device is put into a steam huff-and-puff well to a designated position. Under the condition that the working condition in the horizontal section 2 is measured by an underground temperature monitoring system, one or more adjusting holes 122 in each adjusting hole group of the horizontal section 2 are preliminarily calculated, the adjustment of the number of the adjusting hole groups in the later period is realized, and the punching structure is reasonably arranged so as to facilitate the running of a plurality of short sections 12 to the designated position of the horizontal section;

in a second step, the number of groups of the plurality of adjustment hole groups is adjusted. After steam injection and stewing in the steam huff-and-puff well, the vertical section 1 is lowered into an underground temperature monitoring system to test the temperature, the position with uneven steam absorption in the horizontal section 2 is judged and analyzed according to a temperature curve, and the vertical section 1 is lowered into an adjusting device to increase or reduce the number of groups in a plurality of adjusting hole groups.

1) Increasing the number of groups in the plurality of adjustment hole groups: an adjusting device is lowered into a wellhead main gate 30 on the ground, the adjusting device is lowered to the short section 12 of the horizontal section 2, the adjuster 23 is located in the first hole section 1311, the sliding block 232 is located at the extending position after the pressure in the adjusting passage 233 is increased, the side wall of the sliding block 232 can be matched with the first end stop of the sliding sleeve 131, and therefore the sliding block 232 can continuously push the sliding sleeve 131 to move relative to the short section 12 (in the direction of a right arrow in fig. 1). Thereby increasing the number of groups in the plurality of adjusting hole groups, wherein the adjusting is realized by adjusting the adjusting oil pipe vehicle 222 to adopt different pressures.

2) Reducing the number of groups in the plurality of adjustment hole groups: regulator 23 is positioned within fourth bore section 1511 such that upon increasing pressure within regulating passage 233 slider 232 is in an extended position, the side wall of slider 232 is capable of engaging the second end stop of sliding sleeve 131. In this way, the adjuster 23 can pull the sliding sleeve 131 to move toward the first position-limiting portion 14 (i.e. the left arrow in fig. 1), when the first end of the sliding sleeve 131 stops against the first position-limiting portion 14, the pressure in the adjusting passage 233 is released, the moving section 2316 is retracted by the third elastic member 2315, the slider 232 is in the retracted position by the second elastic member 2313, the actuator 23 is moved in a direction away from the sliding sleeve 131 (in the direction of the left arrow in fig. 1), the actuator 23 is located in the first hole section 1311, the slider 232 is in the extended position after increasing the pressure in the adjustment passage 233, the side wall of the slider 232 can be engaged with the first end stop of the sliding sleeve 131, so that the sliding block 232 can push the sliding sleeve 131 to move relative to the short section 12 (in the direction of the right arrow in figure 1), thereby achieving a reduction in the number of groups in the plurality of adjustment hole groups, which is achieved by adjusting the adjustment manifold block 222 to different pressures.

It should be noted that, when the number of sets in the plurality of adjustment hole sets is increased, the starting position of the sliding sleeve 131 is moved from the plurality of adjustment hole sets; when the number of the plurality of adjusting hole groups is decreased, the starting position of the sliding sleeve 131 is moved from the steam injection hole 121.

Specifically, as shown in fig. 1 to 4, the technical solution of the present embodiment is operated by the following steps:

1) an initial stage: when the pressure of the adjusting oil pipe cart 222 is adjusted to 4MPa, the sliding block 232 can move on the radial pipe body 2312, so that the sliding block 232 can be located at the extending position. When the pressure of the oil pipe truck 222 is adjusted, the pressure is adjusted through the adjusting passage 233. When the pressure of the oil pipe adjusting vehicle 222 is adjusted to 6.5MPa, the sliding block 232 can push the sliding sleeve 131 to move for the first time, so that a first group of adjusting hole groups communicated with the steam injection pipe 11 is realized; when the pressure of the oil pipe regulating vehicle 222 is regulated to 8MPa, the sliding block 232 can push the sliding sleeve 131 to move for the second time, and the first two groups of regulating hole groups communicated with the steam injection pipe 11 are realized; when the pressure of the oil pipe adjusting vehicle 222 is adjusted to 10MPa, the sliding block 232 can push the sliding sleeve 131 to move for the third time, so that the front three groups of adjusting hole groups communicated with the steam injection pipe 11 are realized; by analogy, the sliding sleeve 131 can move for the nth time, and the front n groups of adjusting hole groups communicated with the steam injection pipes 11 are realized.

2) Determining the position of each adjusting hole group: before steam injection and shut-down of a steam huff-and-puff well start to produce, moving the underground temperature monitoring system into the horizontal section 2, testing the temperature in the horizontal section 2, analyzing a measured temperature curve of the underground temperature monitoring system, and determining the adjusting positions of a plurality of adjusting hole groups, wherein the adjusting positions are assumed to be the adjusting hole groups at 520m in the horizontal section and added to the adjusting hole groups at 620m in the horizontal section.

3) Installing the main gate 30, lubricator 41, cross 42, sealer 43, support 44 and gate 50 on the ground: the lubricator 41, the cross joint 42 and the sealer 43 are connected in sequence from bottom to top. A gate 50 and/or a plug flange connected within the cross-piece 42. The power device 22 comprises a pump truck 221 and an adjusting and regulating oil pipe truck 222 connected with the pump truck 221, and the adjusting and regulating oil pipe truck 222 is connected with the adjusting oil pipe 21.

4) The adjusting oil pipe 21 is lowered into the lubricator 41: the main gate 30 is kept in a closed state, the adjusting oil pipe 21 is lowered to the bottom of the lubricator 41, the gate 50 and/or a plug flange are/is arranged on the upper portion of the sealer 43, and the sealer 43 can realize dynamic sealing and static sealing of the adjusting oil pipe 21. When the adjusting oil pipe 21 is lowered, the supporting device 44 supports the guide-in lowering, and the damage to the adjusting oil pipe 21 is prevented.

5) Adjusting the sealing condition of the oil pipe 21: when the pump truck 221 is pressed, the static sealing effect of the adjusting oil pipe 21 is checked, the adjusting oil pipe 21 moves up and down for a distance along the vertical section 1, then the dynamic sealing effect of the adjusting oil pipe 21 is observed, and after the static sealing effect and the dynamic sealing effect are ensured, the adjuster 23 is put into the cylinder.

6) The regulator tube 21 and the regulator 23 are lowered to the bottom of the lubricator 41: the adjusting oil pipe vehicle 222 releases the pressure and lifts the adjusting oil pipe 21 through the supporting device 44, the lifting and the releasing of the adjusting oil pipe 21 through the supporting device 44 are driven to lift the adjusting oil pipe 21 together with the adjuster 23, and the oil enters the bottom of the blowout preventer 41 through the sealer 43.

7) The adjustment hole groups at 520m of the horizontal section 2 are adjusted into two groups: the main gate 30 is opened to measure the length of the regulated oil pipe 21 exposed to the ground. When the adjusting oil pipe 21 is lowered to 515m in the horizontal section 2, the adjusting oil pipe 21 is kept still. When the pump truck 221 is pressed, the pressure applied to the sliding block 232 is greater than the tightening force of the second elastic member 2313, so that the sliding block 232 is in the extended position. The pump truck 221 continues to be pressed to 8MPa, the shear pins 26 on the moving section 2316 are sheared and move rightwards, the sliding sleeve 131 is pushed to move, the stop ring 132 is moved into the corresponding first annular groove 123, and two groups of adjusting hole groups are added.

8) Adjusting the number of groups of adjustment hole groups at 620m within horizontal segment 2: after the adjustment oil pipe cart 222 is depressurized, the sliding block 232 is in the retracted position. And (3) lowering the adjusting oil pipe 21 from the wellhead of the steam huff-and-puff well, passing through the front n adjusting hole groups, and then reaching 615m in the horizontal section 2 to keep the adjusting oil pipe 21 static. When the pump truck 221 is pressed, the pressure applied to the sliding block 232 is greater than the tightening force of the second elastic member 2313, so that the sliding block 232 is in the extended position. The regulator 23 is lowered from the wellhead of the steam huff-puff well to the 620m position in the horizontal section 2, the sliding block 232 pushes the sliding sleeve 131 to move, and n groups of regulating hole groups are increased.

9) The adjusting oil pipe 21 is lifted upwards through the supporting device 44: after the pump truck 221 is depressurized, the adjusting oil pipe 21 is lifted upwards to the blowout preventer 41 through the supporting device 44. The main gate 30 is closed, and the regulator pipe 21 and the regulator 23 are lifted up by the support device 44 and removed out of the continuous sealer 43.

10) Removing the above-ground main gate 30, lubricator 41, cross 42, sealer 43, support 44, and gate 50: and (3) sequentially detaching the coiled tubing sealer 43, the cross joint 42 and the blowout prevention pipe 41 from top to bottom, and detaching the adjusting oil pipe 21 on the ground to finish the steam injection operation of the steam huff-puff well. Therefore, the steam injection system of the embodiment uses a common oil pipe, so that the whole process is low in manufacturing cost and the whole technical scheme is convenient to maintain.

The present application further provides a steam stimulation system, in this embodiment, the steam stimulation system includes a steam injection system and an oil production system 60, the steam injection system is the above-mentioned steam injection system, and the oil production system 60 includes an oil production pipe 61 and an oil pump 62 connected to the oil production pipe 61. The oil in the horizontal section 2 can be extracted out of the steam stimulation well through the oil extraction pipe 61 by the oil pump 62. The steam throughput system of the embodiment can solve the problem that the number of holes of the steam injection hole is adjusted by rotating the adjusting valve in the related art, so that a hydraulic pipeline is easy to damage.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. Steam injection system for injecting steam for a steam huff and puff well comprising a vertical section (1) and a horizontal section (2), characterized in that it comprises:

the steam injection device comprises a steam injection pipe (11) and a short section assembly connected with the steam injection pipe (11), wherein the short section assembly is positioned in the horizontal section (2), the short section assembly comprises a plurality of short sections (12) and a plurality of sliding sleeve assemblies (13) movably arranged in the short sections (12) in a penetrating mode, the short sections (12) and the sliding sleeve assemblies (13) are arranged in a one-to-one corresponding mode, a steam injection hole (121) and a plurality of adjusting hole groups arranged along the axial direction of the short sections (12) at intervals are formed in each short section (12), each adjusting hole group comprises one or a plurality of adjusting holes (122), and the sliding sleeve assemblies (13) can shield the adjusting hole groups;

the adjusting device comprises an adjusting oil pipe (21) which is arranged in the steam injection pipe (11) in a removable mode, a power device (22) which is arranged at a first end of the adjusting oil pipe (21), and an adjuster (23) which is arranged at a second end of the adjusting oil pipe (21), wherein the adjuster (23) comprises a pipe body (231) and a sliding block (232) which is movably arranged on the pipe body (231), the adjusting device further comprises an adjusting passage (233) which penetrates through the pipe body (231), and the sliding block (232) is covered at a radial outlet of the adjusting passage (233), wherein,

slider (232) have an extended position and a retracted position, slider (232) are in during the retracted position, regulator (23) can move in sliding sleeve subassembly (13), slider (232) are in during the extended position, slider (232) drive sliding sleeve subassembly (13) are in move nipple joint (12) are in with the regulation with steam injection pipe (11) intercommunication the group number of adjusting the hole group.

2. The steam injection system of claim 1,

the short section assembly further comprises a first limiting part (14) arranged on the inner wall of the short section (12), the first limiting part (14) is in contact with the first end of the sliding sleeve assembly (13), the sliding sleeve assembly (13) shields the steam injection hole (121) and the adjusting hole groups.

3. The steam injection system of claim 2,

the sliding sleeve assembly (13) comprises a sliding sleeve (131), a stop ring (132) connected with the sliding sleeve (131) and a first elastic piece (133) connected with the stop ring (132), the short section assembly further comprises a blocking cylinder (15) arranged in the second end of the short section (12) in a penetrating manner,

keep off a section of thick bamboo (15) including barrel (151) and setting first fender ring (152) on barrel (151), first elastic component (133) can be established outside barrel (151) and with first fender ring (152) backstop cooperation, be provided with a plurality of first annular (123) on the inner wall of nipple joint (12), backstop circle (132) can be spacing arbitrary in first annular (123), be provided with on sliding sleeve (131) and dodge second annular (1314) of barrel (151), first spacing portion (14) set up the first end of nipple joint (12).

4. The steam injection system of claim 3,

the inner hole of the sliding sleeve (131) comprises a first hole section (1311), a second hole section (1312) and a third hole section (1313) which are connected in sequence, the diameter of the second hole section (1312) is smaller than that of the first hole section (1311) and that of the third hole section (1313), the inner hole of the cylinder body (151) comprises a fourth hole section (1511), a fifth hole section (1512) and a sixth hole section (1513) which are connected in sequence, the diameter of the sixth hole section (1513) is smaller than that of the fourth hole section (1511) and that of the fifth hole section (1512), and the diameter of the second hole section (1312) is equal to or smaller than that of the sixth hole section (1513),

when the sliding block (232) is in the retracted position, the outer diameter of the adjuster (23) is smaller than the diameter of the second hole section (1312), when the sliding block (232) is in the extended position, the adjuster (23) is located in the first hole section (1311), the side wall of the sliding block (232) can be matched with the first end stop of the sliding sleeve (131), or when the number of groups of the adjusting hole groups communicated with the steam injection pipe (11) is reduced, and the sliding block (232) is in the extended position, the adjuster (23) is located in the fourth hole section (1511), the side wall of the sliding block (232) can be matched with the second end stop of the sliding sleeve (131).

5. The steam injection system according to claim 1, wherein the adjuster (23) further comprises a stopper structure (24) connected to a first end of the pipe body (231) and a guide portion (25) connected to a second end of the pipe body (231), a stopper space is formed between the stopper structure (24) and the guide portion (25), the slider (232) is located in the stopper space, and a portion of the slider (232) can protrude out of the stopper space.

6. The steam injection system of claim 5,

the pipe body (231) comprises an axial pipe body (2311), a radial pipe body (2312) arranged on the axial pipe body (2311) and a second elastic piece (2313) arranged in the radial pipe body (2312), the adjusting passage (233) comprises a first communication hole and a second communication hole, the first communication hole is positioned in the radial pipe body (2312), the diameter of the second communication hole is larger than that of the first communication hole, a first step surface is formed between the first communication hole and the second communication hole,

the slider (232) comprises a slider body (2321) and a sliding groove (2322) arranged on the slider body (2321), the sliding groove (2322) is in clearance fit with the radial pipe body (2312), and the second elastic piece (2313) is located in the second communication hole and located between the first step surface and the groove bottom of the sliding groove (2322).

7. The steam injection system of claim 6,

said axial body (2311) comprising a fixed section (2314) and a mobile section (2316) movably connected to said fixed section (2314) by a third elastic element (2315),

the fixing section (2314) comprises a first cylinder section, a second cylinder section, a third cylinder section and a fourth cylinder section which are sequentially connected and have gradually reduced diameters, a second step surface is formed between the third cylinder section and the fourth cylinder section, the fixing section (2314) further comprises a second baffle ring (2317) arranged on the fourth cylinder section,

the moving section (2316) comprises a moving section body (2318) and a connecting section (2319) connected to the moving section body (2318), the radial pipe body (2312) is arranged on the moving section body (2318), a protrusion (23191) is arranged on the inner wall of the connecting section (2319), the protrusion (23191) comprises a first end face and a second end face which are oppositely arranged, the first end face and the second step face can be in stop fit, and the third elastic piece (2315) is limited between the second end face and the second stop ring (2317).

8. The steam injection system of claim 7, wherein the first end of the connecting section (2319) is connected to the moving section body (2318), the second end of the connecting section (2319) is sleeved on the third barrel section, and the adjusting device further comprises a shear pin (26) shearably disposed through the second end of the connecting section (2319) and the third barrel section.

9. The steam injection system according to claim 5, wherein the sliding block (232) is in a circular truncated cone shape, the limiting structure (24) comprises a connecting portion (241) and a second limiting portion (242), the connecting portion (241) is connected with the first end of the pipe body (231), a stop inclined surface (2421) is arranged on the second limiting portion (242), when the sliding block (232) moves from the retracted position to the extended position, the first end of the sliding block (232) protrudes out of the limiting space, and the second end of the sliding block (232) is in stop fit with the stop inclined surface (2421).

10. The steam injection system according to claim 1, further comprising a downhole temperature monitoring system removably disposed within the vertical section (1) and the horizontal section (2).

11. The steam injection system of claim 1, further comprising a main gate (30) disposed at a wellhead of the steam huff-and-puff well and a blowout preventer disposed on the main gate (30), the blowout preventer being sleeved outside the regulator tubing (21).

12. The steam injection system of claim 11, wherein the blowout preventer comprises: lubricator (41), cross (42) and sealer (43) that from bottom to top connect gradually, the steam injection system is still including connecting gate (50) and/or plug flange in cross (42), power device (22) including pump truck (221) and with regulation oil pipe car (222) that pump truck (221) are connected, blowout preventer still includes to be located strutting arrangement (44) of sealer (43) top, in order to support regulation oil pipe (21).

13. A steam stimulation system comprising a steam injection system and a production system (60), characterized in that the steam injection system is a steam injection system according to any of claims 1 to 12, and the production system (60) comprises a production tubing (61) and an oil pump (62) connected to the production tubing (61).

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