A production tubing, an oil production device and an oil production method

Abstract

The present application discloses a production tubing, a production device and a production method, belonging to the technical field of petroleum equipment. Among them, the production tubing includes a casing, a heat-insulating pipe and a tubing string. The casing sleevs the heat-insulating pipe therein, and there is a first gap between the casing and the heat-insulating pipe. The heat-insulating pipe sleevs the tubing string therein, and there is a second gap between the heat-insulating pipe and the tubing string. A releasable first packer is arranged in the first gap. In the production tubing provided by the embodiments of the present application, the casing sleevs the heat-insulating pipe therein, so that the casing can play the role of protecting the heat-insulating pipe, and the first gap between the casing and the heat-insulating pipe allows the casing to reserve an adjustment space for the heat-insulating pipe. After injecting steam into the oil well through the second gap, the steam can heat the oil reservoir to improve the fluidity of the oil reservoir. Subsequently, the crude oil in the oil reservoir can be collected through the tubing string. The heat-insulating pipe and the tubing string are lowered into the oil well at one time, reducing the process of disassembling the heat-insulating pipe from the oil well, thereby improving the crude oil collection efficiency.

Description

Technical Field

[0001] This application belongs to the technical field of oil equipment, and particularly relates to a production pipe, a production device and a production method. Background Art

[0002] In the petroleum production engineering, the oil in the oil well is pumped out by pumping oil through a production pipe lowered into the oil well to complete the petroleum production. When collecting heavy oil, steam needs to be injected into the oil well first to reduce the consistency of the heavy oil.

[0003] In the related art, in order to collect heavy oil, the heat-insulating pipe can be installed in the well for gas injection first. After the gas injection is completed, the heat-insulating pipe is pulled out, and then the production pipe is installed in the well for oil production. This requires at least two pipe string trips, resulting in low efficiency of heavy oil production. Summary of the Invention

[0004] This application aims to at least solve the technical problem of low efficiency of current heavy oil production to a certain extent. For this purpose, this application provides a production pipe, a production device and a production method.

[0005] In a first aspect, a production pipe provided by an embodiment of this application includes: a casing, a heat-insulating pipe and a production pipe,

[0006] Wherein, the casing sleeves the heat-insulating pipe therein, and there is a first gap between the casing and the heat-insulating pipe. The heat-insulating pipe sleeves the production pipe therein, and there is a second gap between the heat-insulating pipe and the production pipe. A releasable first packer is arranged in the first gap.

[0007] In some embodiments, the production pipe has a first end and a second end. The first end extends out of the heat-insulating pipe and is located inside the casing.

[0008] In some embodiments, there is a third gap between the first end and the casing, and a second packer is arranged in the third gap.

[0009] In some embodiments, the heat-insulating pipe has a third end adjacent to the first end and a fourth end adjacent to the second end. The first packer is arranged at the third end.

[0010] In some embodiments, the heat-insulating pipe includes a telescopic pipe section, a first heat-insulating section and a second heat-insulating section. The first heat-insulating section is connected to the second heat-insulating section through the telescopic pipe section.

[0011] In some embodiments, the production pipe further includes a screen pipe, and the screen pipe is arranged inside the production pipe.

[0012] In some embodiments, the production tubing further includes a pipe plug, and the pipe plug is disposed at an end of the screen pipe away from the tubing.

[0013] In a second aspect, based on the above production tubing, an embodiment of the present application further provides an oil production device, including the above production tubing.

[0014] In some embodiments, the oil production device further includes an oil pump, a sucker rod, and a steam generator. One end of the sucker rod is connected to the oil pump, the other end of the sucker rod extends into the tubing, and the steam generator is in communication with the second gap.

[0015] In some embodiments, the oil production device further includes a first fixing member and a second fixing member. The first fixing member is connected to an end of the sucker rod extending into the tubing, the second fixing member is disposed in the tubing, and the first fixing member is detachably connected to the second fixing member.

[0016] In some embodiments, the first fixing member is a plunger, and the second fixing member is a fixed valve.

[0017] In a third aspect, based on the above oil production device, an embodiment of the present application further provides an oil production method, including the following steps:

[0018] Inject steam into the oil well through the steam generator from the first gap;

[0019] Seal the oil well within a preset time period;

[0020] Open the oil well, release the first packer, and pump the crude oil out of the well through the oil pump and the sucker rod.

[0021] In some embodiments, the first packer is released before pumping the crude oil through the oil pump and the sucker rod.

[0022] In the production tubing provided by the embodiment of the present application, the casing sleeves the heat-insulating pipe therein, so that the casing can protect the heat-insulating pipe. The first gap between the casing and the heat-insulating pipe allows the casing to reserve an adjustment space for the heat-insulating pipe. After injecting steam into the oil well through the second gap, the steam can heat the oil layer to improve the fluidity of the oil layer. Subsequently, the crude oil in the oil layer can be collected through the tubing. The heat-insulating pipe and the tubing are lowered into the oil well at one time, reducing the process of disassembling the heat-insulating pipe from the oil well, thereby improving the crude oil collection efficiency. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 The structural schematic diagram of the oil production device disclosed in the embodiment of the present application is shown;

[0025] Figure 2 The structural schematic diagram inside the oil pipe in the oil production device disclosed in the embodiment of the present application is shown.

[0026] Reference numerals:

[0027] 100 - casing, 110 - first gap, 120 - third gap, 130 - first packer,

[0028] 200 - heat insulation pipe, 210 - second gap, 220 - third end, 230 - fourth end, 240 - first heat insulation section, 250 - telescopic pipe section, 260 - second heat insulation section, 270 - second packer,

[0029] 300 - oil pipe, 310 - first end, 320 - second end, 330 - plug, 340 - second fixing member,

[0030] 400 - screen pipe,

[0031] 500 - sucker rod, 510 - first fixing member,

[0032] 600 - oil reservoir. Detailed implementation manners

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] It should be noted that all the directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0035] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0037] The present application will be described below in conjunction with the accompanying drawings and with reference to specific embodiments:

[0038] Embodiment 1

[0039] Please refer to Figures 1 to 2 , this embodiment of the present application discloses a production tubing, which includes a casing 100, a heat insulation pipe 200, and a tubing 300. This production tubing 300 can be applied to an oil production device, especially for collecting heavy oil.

[0040] Among them, the casing 100 is a basic component of the production tubing 300. The casing 100 is arranged in the oil well, and the casing 100 is in contact with the inner wall of the oil well. At least some other components of the production tubing 300 are arranged inside the casing 100. The casing 100 can protect the components arranged inside the casing 100 to improve the safety of the gas injection oil production process.

[0041] The heat insulation pipe 200 can be arranged inside the casing 100. One end of the heat insulation pipe 200 extends to the oil layer 600 in the oil well. During the gas injection operation before oil production, steam can be injected into the heat insulation pipe 200, so that the steam can penetrate deep into the oil layer 600 in the oil well. The steam has a high temperature and can be injected into the oil layer 600. The high-temperature steam contacts the heavy oil in the oil layer 600, can heat the heavy oil in the oil layer 600, and at the same time, the water in the steam can also be mixed with the oil layer 600 to reduce the viscosity of the heavy oil, so that the fluidity of the heavy oil in the oil layer 600 is enhanced. In this way, the heavy oil in the oil layer 600 can be easily pumped out of the oil well by an oil pump and prevent the heavy oil from blocking the oil pump and the tubing 300.

[0042] There is a gap between the casing 100 and the heat-insulating pipe 200, and this gap is the first gap 110. The first gap 110 provides a moving space for the heat-insulating pipe 200, enabling the heat-insulating pipe 200 to adjust its position within the casing 100, so as to facilitate connecting one end of the heat-insulating pipe 200 to the steam device and aligning the other end of the heat-insulating pipe 200 with the oil layer 600. At the same time, the first gap 110 between the casing 100 and the heat-insulating pipe 200 also enables the heat-insulating pipe 200 not to be in direct contact with the casing 100, providing a channel for the rapid discharge of oil and gas to the outside of the oil well during the blowdown process before subsequent oil production.

[0043] The tubing 300 is arranged inside the heat-insulating pipe 200, and there is a gap between the tubing 300 and the heat-insulating pipe 200. This gap is the second gap 210. Steam can be injected into the oil layer 600 through the second gap 210 between the heat-insulating pipe 200 and the tubing 300. After the steam is fully mixed with the oil layer 600, the oil pump can pump out the crude oil with reduced consistency in the oil layer 600 through the tubing 300 to collect the crude oil.

[0044] The first packer 130 can be arranged in the first gap 110 between the casing 100 and the heat-insulating pipe 200. After the steam is discharged through the second gap 210 between the heat-insulating pipe 200 and the tubing 300, the first packer 130 can seal the area between the casing 100 and the heat-insulating pipe 200, thereby preventing the steam from entering the first gap 110 between the casing 100 and the heat-insulating pipe 200. In this way, the steam can be concentrated at the oil layer 600 in the oil well, enabling the steam to contact and mix with the oil layer 600 more fully, and the fluidity of the viscous oil in the oil layer 600 can be improved faster, thus improving the oil production efficiency.

[0045] When the steam is in full contact with the oil layer 600 and the fluidity of the oil layer 600 is improved, the pressure in the oil well will increase, and the first packer 130 can be unsealed from the first gap 110. In this way, the first gap 110 is in a communicating state with the oil layer 600 and the wellhead in the oil well. Due to the increase in pressure, part of the crude oil in the oil layer 600 can erupt to the outside of the well from the first gap 110 to achieve the purpose of pressure relief. After the pressure relief is completed, the crude oil in the oil layer 600 can be normally collected through the tubing 300.

[0046] When installing the production tubing 300, the casing 100, the tubing 300, and the heat-insulating pipe 200 can be installed in the oil well at one time and extended to the oil layer 600 in the oil well. By injecting steam into the second gap 210 between the heat-insulating pipe 200 and the tubing 300, the steam can contact the oil layer 600. The steam can heat the oil layer 600 and mix with the oil layer 600 to improve the fluidity of the oil layer 600. The first packer 130 disposed in the first gap 110 can seal the first gap 110 to prevent steam from entering the first gap 110, so that the steam can contact the oil layer 600 more fully. After the steam heats the oil layer 600 to improve the fluidity of the oil layer 600, the first packer 130 can be released to relieve the pressure of the oil layer 600. Subsequently, the crude oil can be pumped out of the oil well through the tubing 300 to complete the oil production operation.

[0047] In the production tubing 300 provided by the embodiment of the present application, the casing 100 sleeves the heat-insulating pipe 200, so that the casing 100 can protect the heat-insulating pipe 200. The first gap 110 between the casing 100 and the heat-insulating pipe 200 allows the casing 100 to reserve an adjustment space for the heat-insulating pipe 200. After injecting steam into the oil well through the second gap 210, the steam can heat the oil layer 600 to improve the fluidity of the oil layer 600. Subsequently, the crude oil in the oil layer 600 can be collected through the tubing 300. The heat-insulating pipe 200 and the tubing 300 are lowered into the oil well at one time, reducing the process of disassembling the heat-insulating pipe 200 from the oil well, thereby improving the crude oil collection efficiency.

[0048] In some embodiments, in order to make the steam contact and mix with the oil layer 600 better, the tubing 300 of the present application can be provided with a first end 310 and a second end 320. The second end 320 of the tubing 300 is the end adjacent to the oil well inlet. The first end 310 of the tubing 300 is located in the oil well. The second end 320 of the tubing 300 can be connected to a pumping device such as an oil pump. The first end 310 of the tubing 300 extends outside the heat-insulating pipe 200 and is located inside the casing 100, so that the casing 100 can protect the tubing 300. The tubing 300 is located outside the heat-insulating pipe 200. Therefore, there is a certain distance between the second gap 210 between the tubing 300 and the heat-insulating pipe 200 and the first end 310 of the tubing 300. When the steam is discharged from the second gap 210 between the tubing 300 and the heat-insulating pipe 200, the outer wall of the part of the tubing 300 outside the heat-insulating pipe 200 can block the steam, preventing the steam from entering the tubing 300 from the first end 310 of the tubing 300 and causing steam leakage and loss.

[0049] In addition, it should also be understood that after the first end 310 of the tubing 300 extends out of the heat insulation pipe 200, the first end 310 of the tubing 300 can extend into the oil layer 600, which facilitates the extraction of the crude oil in the oil layer 600 through the tubing 300. At the same time, after the tubing 300 extends into the oil layer 600, the oil layer 600 can play a role in liquid sealing the first end 310 of the tubing 300, which can further prevent the steam from leaking and losing through the first end 310 of the tubing 300.

[0050] In some embodiments, in order to further make the steam contact the oil layer 600 to improve the fluidity of the oil layer 600, the above-mentioned heat insulation pipe 200 can be provided with a third end 220 and a fourth end 230. The third end 220 of the heat insulation pipe 200 is on the same side as the first end 310 of the tubing 300, and the fourth end 230 of the heat insulation pipe 200 is on the same side as the second end 320 of the tubing 300. Therefore, the fourth end 230 of the heat insulation pipe 200 is also located at the wellhead of the oil well, and the third end 220 of the heat insulation pipe 200 extends into the oil well. The first packer 130 can be arranged between the first end 310 of the heat insulation pipe 200 and the casing 100, which can limit the steam discharged from the second gap 210 between the first packer 130 and the second packer 270, and limit the steam within a relatively small range to prevent the steam from entering the first gap 110 between the casing 100 and the heat insulation pipe 200.

[0051] Specifically, the first packer 130 can be arranged at the upper edge of the oil layer 600, and the second packer 270 can be arranged below the first packer 130, so that the steam output from the second gap 210 can be completely within the oil layer 600, thereby more efficiently contacting the oil layer 600 to improve the fluidity of the oil layer 600.

[0052] Since the steam has a relatively high temperature, during the process of the steam passing through the second gap 210 between the heat insulation pipe 200 and the tubing 300, the contact between the steam and the inner wall of the heat insulation pipe 200 will cause the temperature of the heat insulation pipe 200 to rise. When the steam completely passes through the second gap 210 and contacts the oil layer 600, the temperature of the heat insulation pipe 200 will decrease again. The change of the heat insulation pipe 200 during the temperature rise and temperature drop processes will cause the heat insulation pipe 200 to be affected by the thermal expansion and contraction effect.

[0053] Therefore, in order to avoid damage to the heat insulation pipe 200 caused by the thermal expansion and contraction effect, a telescopic section can be provided on the heat insulation pipe 200, and the telescopic section enables the length of the heat insulation pipe 200 to change. In this way, when the heat insulation pipe 200 is heated and deformed and becomes longer, the heat insulation pipe 200 can compress the telescopic pipe, and when the heat insulation pipe 200 is cooled and deformed and shortened, the heat insulation pipe 200 can stretch the telescopic pipe, thereby providing a movement margin for the deformation of the heat insulation pipe 200 and preventing the heat insulation pipe 200 from being damaged after deformation.

[0054] Specifically, the heat insulation pipe 200 can be set to include a telescopic pipe section 250, a first heat insulation section 240, and a second heat insulation section 260. The first heat insulation section 240 and the second heat insulation section 260 are connected by the telescopic pipe section 250. The telescopic pipe section 250 can adopt an elastic connector or a flexible connector. In this way, when the first heat insulation section 240 and the second heat insulation section 260 deform due to temperature changes, both the first heat insulation section 240 and the second heat insulation section 260 can stretch or compress the telescopic pipe section 250, thereby preventing the first heat insulation section 240 and the second heat insulation section 260 from being damaged due to deformation.

[0055] Of course, multiple telescopic pipe sections 250 can also be provided. Correspondingly, at least three of the above-mentioned heat insulation sections can also be provided. In this way, multiple heat insulation sections can be connected by the telescopic pipe sections 250, so that the overall telescopic performance of the heat insulation pipe 200 is better, and further prevent the heat insulation pipe 200 from being damaged by heat.

[0056] In some embodiments, the production pipe 300 of the embodiment of the present application can also be provided with a screen pipe 400. The screen pipe 400 is connected to the first end 310 of the oil pipe 300. The screen pipe 400 can play a role in filtering the crude oil, achieving the purpose of initially separating impurities in the crude oil. Specifically, one end of the screen pipe 400 is butted against the first end 310 of the oil pipe 300, and the other end of the screen pipe 400 has an opening so that the crude oil can be pumped into the screen pipe 400. A screen can be provided in the screen pipe 400, and the screen can filter the crude oil, so that impurities with relatively large volumes in the crude oil, or partially unmelted parts are blocked on one side of the filter screen, preventing the screen pipe 400 and the oil pipe 300 from being blocked.

[0057] The screen in the screen pipe 400 can be provided at the end of the screen pipe 400 facing away from the oil pipe 300, so that impurities and partially unmelted crude oil can be blocked outside the screen pipe 400, further preventing the screen pipe 400 and the oil pipe 300 from being blocked. The number of screens in the screen pipe 400 can also be provided with multiple ones, and the multiple screens can be arranged at intervals in the screen pipe 400, further improving the filtering effect of the screen pipe 400.

[0058] The screen pipe 400 and the first end 310 of the oil pipe 300 can be set to be detachably connected. In this way, the screen pipe 400 and the oil pipe 300 can be installed before the oil pipe 300 is lowered into the oil well, thereby reducing the manufacturing process difficulty of the oil pipe 300. At the same time, when the screen pipe 400 is damaged or blocked, the screen pipe 400 can also be separated from the oil pipe 300 in the oil well, so that the crude oil can smoothly enter the oil pipe 300.

[0059] In some embodiments, the production pipe 300 of the embodiment of the present application can also be provided with a plug 330. The plug 330 is arranged at the end of the screen pipe 400 facing away from the oil pipe 300, and the plug 330 can control the flow rate of the crude oil entering the oil pipe 300.

[0060] Example Two

[0061] Based on the production tubing 300 described above, an embodiment of the present application further provides an oil production device, which includes the production tubing 300 described above. This oil production device can not only inject steam into the oil reservoir 600 to improve the fluidity of the crude oil in the oil reservoir 600, but also collect the crude oil in the oil reservoir 600, thereby improving the crude oil collection efficiency.

[0062] Specifically, the oil production device of the embodiment of the present application is further provided with an oil pump, a sucker rod 500, and a steam generator. Among them, the oil pump is connected to the sucker rod 500, and the sucker rod 500 extends into the tubing 300. The cooperation between the oil pump and the sucker rod 500 can pump the crude oil in the oil reservoir 600 into the tubing 300 and rise along the tubing 300 to the outside of the oil well to achieve the purpose of collecting crude oil. The steam generator is communicated with the second gap 210 between the heat insulation pipe 200 and the tubing 300. The steam generator can inject steam into the second gap 210, and the steam can move along the second gap 210 to contact the oil reservoir 600, so as to achieve the purpose of heating the oil reservoir 600 and improving the fluidity of the oil reservoir 600. After the oil reservoir 600 is heated, the first packer 130 can be unsealed to achieve the purpose of relieving pressure on the oil reservoir 600 and raising the dynamic liquid level of the oil reservoir. Subsequently, the cooperation between the oil pump and the sucker rod 500 can be used to pump the crude oil in the oil reservoir 600 out of the tubing 300.

[0063] In some embodiments, in order to keep the sucker rod 500 stable, a first fixing member 510 may be provided at one end of the sucker rod 500 away from the oil pump, and a second fixing member 340 may be provided in the tubing 300. The first fixing member 510 and the second fixing member 340 are detachably connected, so that one end of the sucker rod 500 away from the oil pump can be fixed in the tubing 300, preventing the sucker rod 500 from swinging, so that the sucker rod 500 can stably contact the oil reservoir 600. In this way, the cooperation between the oil pump and the sucker rod 500 can collect the crude oil in the oil reservoir 600 more stably. At the same time, it can also prevent the sucker rod 500 from swinging in the tubing 300 and colliding with the inner wall of the tubing 300 to protect the sucker rod 500 and the tubing 300.

[0064] Specifically, the first fixing member 510 can be a plunger, and the second fixing member 340 can be a fixed valve. The plunger and the fixed valve are detachably connected, so that the plunger and the fixed valve can be fixedly connected, and further the sucker rod 500 can be fixed in the tubing 300. The fixed valve can be connected to the inner wall of the tubing 300 through a connecting rod. Multiple connecting rods can be provided, and the multiple connecting rods can be distributed along the circumferential direction of the tubing 300, and one end of each of the multiple connecting rods is connected to the fixed valve to fix the fixed valve in the tubing 300.

[0065] Example Three

[0066] Based on the above oil production device, an embodiment of the present application further provides an oil production method, which can be applied to the above oil production device. The oil production method includes the following steps:

[0067] First, steam is injected into the oil reservoir 600 from the second gap 210 through the above steam generator;

[0068] Subsequently, the first packer 130 is released, and then the crude oil in the oil reservoir 600 is pumped out through the oil pipe 300 by the oil pump and the sucker rod 500 to complete the crude oil collection.

[0069] In some embodiments, in order to make the efficiency of heating the oil reservoir 600 by the steam injected into the oil reservoir 600 higher, after the steam is injected into the oil reservoir 600, the inlet of the oil well can be closed, so that the steam can better contact the oil reservoir 600 to achieve the purpose of soaking the well.

[0070] In some embodiments, in order to make the crude oil in the oil reservoir 600 easy to collect, the second packer 270 can be released before starting the oil pump, so that the oil reservoir 600 is no longer blocked by the second packer 270. Correspondingly, the oil pump and the sucker rod 500 can more easily collect the crude oil in the oil reservoir 600.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

Claims

1. A production tubing, characterized in that, It includes a casing (100), a heat-insulating pipe (200) and a tubing string (300). Among them, the casing (100) sleevs the heat-insulating pipe (200) therein, and there is a first gap (110) between the casing (100) and the heat-insulating pipe (200). The heat-insulating pipe (200) sleevs the tubing string (300) therein, and there is a second gap (210) between the heat-insulating pipe (200) and the tubing string (300). A releasable first packer (130) is arranged in the first gap (110). The tubing string (300) has a first end (310) and a second end (320). The first end (310) extends out of the heat-insulating pipe (200), and the first end (310) is located inside the casing (100). The first end (310) of the tubing string (300) is located in the oil well, and the first end (310) extends into the oil reservoir (600).

2. The production tubing according to claim 1, wherein There is a third gap (120) between the first end (310) and the casing (100), and a second packer (270) is arranged in the third gap (120).

3. The production tubing according to claim 1, characterized in that, The heat-insulating pipe (200) has a third end (220) adjacent to the first end (310) and a fourth end (230) adjacent to the second end (320), and the first packer (130) is arranged at the third end (220).

4. The production tubing according to claim 3, wherein The heat-insulating pipe (200) includes a telescopic pipe section (250), a first heat-insulating section (240) and a second heat-insulating section (260), and the first heat-insulating section (240) is connected to the second heat-insulating section (260) through the telescopic pipe section (250).

5. The production tubing according to claim 3 or 4, characterized in that The production tubing string further includes a screen pipe (400), and the screen pipe (400) is arranged inside the tubing string (300).

6. The production tubing according to claim 5, characterized in that, The production tubing string further includes a plug (330), and the plug (330) is arranged at one end of the screen pipe (400) away from the tubing string (300).

7. An oil production device, characterized in that, It includes the production tubing string according to any one of claims 1-6.

8. The oil production device according to claim 7, wherein, The oil production device further includes an oil pump, a sucker rod (500) and a steam generator. One end of the sucker rod (500) is connected to the oil pump, the other end of the sucker rod (500) extends into the tubing string (300), and the steam generator is communicated with the second gap (210).

9. The oil production device according to claim 8, wherein, The oil production device further includes a first fixing member (510) and a second fixing member (340). The first fixing member (510) is connected to one end of the sucker rod (500) extending into the tubing string (300). The second fixing member (340) is arranged inside the tubing string (300), and the first fixing member (510) is detachably connected to the second fixing member (340).

10. The oil production device according to claim 9, characterized in that, The first fixing member (510) is a plunger, and the second fixing member (340) is a fixed valve.

11. An oil production method, applied to the oil production device according to any one of claims 8-10, characterized in that, It includes the following steps: Inject steam into the oil well from the second gap (210) through the steam generator. Seal the oil well within a preset time period. Open the oil well, release the first packer (130), and pump the crude oil out of the well through the oil pump and the sucker rod (500).

12. The oil production method according to claim 11, characterized in that, Before pumping the crude oil through the oil pump and the sucker rod (500), release the first packer (130).

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