Thermal production well steam injection heat insulation compensator

Abstract

The invention relates to the technical field of thickened oil recovery, and discloses a thermal production well steam injection and heat insulation compensator which comprises a pipe column, a fixing flange is fixedly installed on the outer surface of the pipe column, a spring rod is movably installed in the fixing flange, a compensation mechanism is arranged in the pipe column, a packer connector is arranged in the pipe column, and the packer connector is connected with the spring rod. A connector is arranged in the pipe column, a center column is arranged in the pipe column, and a sealing buffer pad is arranged on the inner wall of the pipe column. According to the steam injection and heat insulation compensator for the thermal production well, the compensation mechanism is arranged to enable the inner pipe, the packer connector and the connector to be matched, under the action of high-temperature steam, the inner pipe can stretch out of the heat insulation pipe, and therefore the defect that oil absorption work is inconvenient due to the fact that the length of a traditional oil absorption device is limited is overcome; the defects that an existing oil absorption device lacks a compensation device and is single in practical function are overcome, the working efficiency of the steam injection heat insulation underground compensator is improved, the service life of the steam injection heat insulation underground compensator is prolonged, and use is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of heavy oil production, in particular to a thermal production well steam injection insulation compensator. Background Art

[0002] Among my country's heavy oil reservoirs, the Liaohe Oilfield accounts for one-third of the country's underground reserves. For this reason, as early as the early 1970s, heavy oil wells were exploited by steam injection. The traditional exploitation method uses a telescopic pipe to go into the well, and steam is injected into the thick layer in the well through the oil pipe. After the viscosity of the thick layer is reduced, steam is sent to the ground with a pump.

[0003] When exploiting heavy oil wells, steam needs to be injected into the heavy oil layer in the well through the oil pipe. However, when the traditional telescopic pipe in the well enters the well, the entire pipe body is exposed in the oil well. In addition, when the telescopic pipe is working, the pipe body moves and enters the smooth oil pipe due to thermal expansion. During the steam injection process, a huge heat loss is caused in the pipe, and the huge heat will cause the casing in the well to be in a high temperature state, resulting in casing fracture. In the process of relative sliding between the core pipe and the pipe sleeve, a small amount of oil and gas will enter the annulus between the two through the gap and is difficult to eliminate, which seriously affects the compensation effect of the compensator. Therefore, a thermal well steam injection insulation compensator is proposed to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a thermal well steam injection insulation compensator, which has the advantages of good sealing effect, good insulation effect and good protection effect, and solves the problem that when a traditional telescopic pipe in a well enters the well, the entire pipe body is exposed in the oil well, and the telescopic pipe moves and enters the smooth oil pipe due to heat expansion during operation, causing huge heat loss in the pipe during the steam injection process, and the huge heat will cause the casing in the well to be in a high temperature state, resulting in casing fracture, and in the process of relative sliding of the core pipe and the pipe sleeve, a small amount of oil and gas will enter the annulus between the two through the gap and is difficult to eliminate, seriously affecting the compensation effect of the compensator.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purposes of having good sealing effect, good insulation effect and good protection effect, the present invention provides the following technical solutions: a thermal recovery well steam injection insulation compensator, comprising a pipe string, a fixed flange is fixedly installed on the outer surface of the pipe string, a spring rod is movably installed inside the fixed flange, a compensation mechanism is arranged inside the pipe string, a packer connector is arranged inside the pipe string, a connector is arranged inside the pipe string, a center column is arranged inside the pipe string, and a sealing buffer pad is arranged on the inner wall of the pipe string.

[0008] Preferably, the compensation mechanism includes a fastening flange, the outer surface of the spring rod is sleeved with the fastening flange, the outer surface of the fastening flange is fixedly installed with a slider, the interior of the fastening flange is fixedly installed with an insulation tube, the right side of the insulation tube is fixedly installed with a sealing connecting plate, the interior of the sealing connecting plate is movably installed with a sealing ring, the right side of the sealing connecting plate is threadedly connected with a clamping head, the interior of the insulation tube is provided with an inner tube, and the right end of the inner tube is fixedly installed with a connecting plate.

[0009] Preferably, through holes are provided inside the fixing flange and inside the fastening flange, and the through holes are arranged at equal distances inside the fixing flange and the fastening flange.

[0010] Preferably, the outer surface of the spring rod is provided with threads, and the outer surface of the spring rod is threadedly connected to two nuts.

[0011] Preferably, a slide groove matched with the slide block is provided on the inner wall of the pipe column, and the slide block is arranged around the outer surface of the fastening flange.

[0012] Preferably, the right side of the insulation tube and the inside of the sealing connection plate and the clamping head are all provided with sliding holes adapted to the inner tube, and the right end of the inner tube extends to the right side of the sealing connection plate and the clamping head through the sliding hole.

[0013] Preferably, a slide groove matched with the inner tube is opened inside the packer connector, and the right end of the inner tube extends to the inside of the packer connector through the slide groove.

[0014] Preferably, the connecting plate is located inside the central column, and a mounting ring matched with the sealing buffer pad is provided inside the pipe column.

[0015] Preferably, the right side of the packer connector is movably connected to the left side of the connector, and the right side of the connector is movably connected to the left side of the center column.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a thermal well steam injection insulation compensator having the following features:

[0018] Beneficial effects:

[0019] 1. The thermal well steam injection insulation compensator, by setting a compensation mechanism to make the inner tube, the packer connector and the connector cooperate, under the action of high-temperature steam, the inner tube can be extended in the insulation tube, thereby overcoming the disadvantages of the traditional oil suction device that the length is limited and the oil suction work is inconvenient, and overcomes the shortcomings of the existing oil suction device that lacks a compensation device and has a single practical function, thereby improving the working efficiency and service life of the steam injection insulation downhole compensator, and avoiding the disadvantage that the oil suction inner tube is exposed to the outside and is easily broken due to the influence of thermal expansion during use.

[0020] 2. The thermal well steam injection insulation compensator has a better sealing effect by setting a compensation mechanism. The sealing effect of the connection is detected by the sealing ring, which can effectively prevent heat dissipation and avoid the influence of heat dissipation on the casing performance. During the relative sliding of the equipment, a small amount of oil and gas enters the annulus between the two through the gap and is difficult to remove. At the same time, the sealing buffer pad enables the equipment to have the function of relative buffering protection, providing strong protection for the buffering collision of the equipment, which can better protect the equipment and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a front cross-sectional schematic diagram of the structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the sealing ring structure of the present invention;

[0024] Figure 4 The compensation mechanism of the present invention

[0025] Structural diagram.

[0026] In the figure: 1. pipe column; 2. fixing flange; 3. spring rod; 4. compensation mechanism; 401. fastening flange; 402. slider; 403. insulation pipe; 404. sealing connecting plate; 405. sealing ring; 406. clamping head; 407. inner pipe; 408. connecting plate; 5. packer connector; 6. connector; 7. center column; 8. sealing buffer pad. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-4 A thermal well steam injection insulation compensator comprises a pipe string 1, a fixed flange 2 is fixedly installed on the outer surface of the pipe string 1, a spring rod 3 is movably installed inside the fixed flange 2, a compensation mechanism 4 is arranged inside the pipe string 1, a packer connector 5 is arranged inside the pipe string 1, a connector 6 is arranged inside the pipe string 1, a center column 7 is arranged inside the pipe string 1, and a sealing buffer pad 8 is arranged on the inner wall of the pipe string 1.

[0029] In the example:

[0030] The setting of the pipe column 1 can provide installation and fixation for the equipment. The setting of the fixing flange 2 can connect and fix the fastening flange 401 by bolting to the bottom. The setting of the spring rod 3 can effectively buffer the movement of the fastening flange 401 to form a buffer protection, and at the same time can limit the movement trajectory of the fastening flange 401. The setting of the slider 402 can make the insulation tube 403 move inside the pipe column 1 and increase the stability of the movement. The setting of the insulation tube 403 can effectively isolate the heat of gas injection and avoid heat loss. The setting of the sealing connection plate 404 can provide installation and fixation for the sealing ring 405. At the same time, it is convenient to install and fix the clamping head 406. The setting of the sealing ring 405 can enhance the sealing effect of the equipment and avoid heat leakage. The setting of the clamping head 406 can strengthen the movable fixation of the inner tube 407. The setting of the connecting plate 408 can facilitate transportation. The setting of the packer connector 5 can prevent oil and gas leakage during the oil suction process. The setting of the connector 6 can facilitate the connection and fixation of the center column 7 and the packer connector 5, and it can also be used for oil and gas transportation. The setting of the sealing buffer pad 8 can enhance the buffering effect. The buffering effect can effectively protect the equipment and extend the service life of the equipment.

[0031] First, connect the inner tube 407 to the gas injection equipment, and inject gas into the inner tube 407 through the gas injection equipment. The inner tube 407 is moved by the action of high-temperature steam. When the inner tube 407 moves, the sealing connecting plate 404 and the clamping head 406 are driven to move at the same time. The movement of the sealing connecting plate 404 and the clamping head 406 drives the insulation tube 403 to move at the same time. The movement of the insulation tube 403 also drives the fastening flange 401 to move. At the same time, the insulation tube 403 is movably connected to the mounting ring. Due to the setting of the spring rod 3, the fastening flange 401 compresses the spring rod 3 during the movement. The spring rod 3 plays a certain buffering role, further maintains the stability of sliding, limits the sliding trajectory, and can also effectively prevent it from falling off due to excessive sliding, thereby further improving the safety performance.

[0032] To sum up, the thermal well steam injection insulation compensator, by setting the compensation mechanism 4, enables the cooperation between the inner tube 407, the isolation device connector 5 and the connector 6. Under the action of high-temperature steam, the inner tube 407 can extend out of the insulation tube 403, thereby overcoming the disadvantages of the traditional oil suction device that the length is limited and the oil suction work is inconvenient, and overcomes the shortcomings of the existing oil suction device that lacks a compensation device and has a single practical function, thereby improving the working efficiency and service life of the steam injection insulation downhole compensator, and avoiding the disadvantage that the oil suction inner tube 407 is exposed to the outside and is easily broken due to thermal expansion during use.

[0033] Furthermore, by setting up the compensation mechanism 4, the equipment has a better sealing effect. The sealing effect of the connection is detected by the sealing ring 405, which can effectively prevent heat dissipation and avoid the influence of heat dissipation on the casing performance. During the relative sliding of the equipment, a small amount of oil and gas enters the annulus between the two through the gap and is difficult to remove. At the same time, the sealing buffer pad 8 enables the equipment to have the function of relative buffering protection, provides strong protection for the equipment's buffering collision, can better protect the equipment, and extend the service life of the equipment.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermal well steam injection insulation compensator, comprising a pipe column (1), characterized in that: A fixed flange (2) is fixedly installed on the outer surface of the pipe string (1), a spring rod (3) is movably installed inside the fixed flange (2), a compensation mechanism (4) is arranged inside the pipe string (1), a packer connector (5) is arranged inside the pipe string (1), a connector (6) is arranged inside the pipe string (1), a center column (7) is arranged inside the pipe string (1), and a sealing buffer pad (8) is arranged on the inner wall of the pipe string (1).

2. A thermal well steam injection insulation compensator according to claim 1, characterized in that: The compensation mechanism (4) comprises a fastening flange (401), the outer surface of the spring rod (3) is sleeved with the fastening flange (401), the outer surface of the fastening flange (401) is fixedly mounted with a slider (402), the interior of the fastening flange (401) is fixedly mounted with a heat-insulating tube (403), the right side of the heat-insulating tube (403) is fixedly mounted with a sealing connecting plate (404), the interior of the sealing connecting plate (404) is movably mounted with a sealing ring (405), the right side of the sealing connecting plate (404) is threadedly connected with a clamping head (406), the interior of the heat-insulating tube (403) is provided with an inner tube (407), and the right end of the inner tube (407) is fixedly mounted with a connecting plate (408).

3. A thermal insulation compensator for steam injection in thermal recovery wells according to claim 2, characterized in that: Through holes are provided inside the fixing flange (2) and inside the fastening flange (401), and the through holes are arranged at equal distances inside the fixing flange (2) and inside the fastening flange (401).

4. The thermal insulation compensator for steam injection in thermal recovery wells according to claim 1, characterized in that: The outer surface of the spring rod (3) is provided with a thread, and the outer surface of the spring rod (3) is threadedly connected to two nuts.

5. The thermal insulation compensator for steam injection in thermal recovery wells according to claim 2, characterized in that: The inner wall of the pipe column (1) is provided with a sliding groove matched with the sliding block (402), and the sliding block (402) is arranged around the outer surface of the fastening flange (401).

6. A thermal insulation compensator for steam injection in thermal recovery wells according to claim 2, characterized in that: The right side of the insulation tube (403) and the inside of the sealing connection plate (404) and the clamping head (406) are all provided with sliding holes adapted to the inner tube (407), and the right end of the inner tube (407) extends to the right side of the sealing connection plate (404) and the clamping head (406) through the sliding hole.

7. The thermal well steam injection insulation compensator according to claim 2, characterized in that: A slide groove matched with the inner tube (407) is provided inside the packer connector (5), and the right end of the inner tube (407) extends to the inside of the packer connector (5) through the slide groove.

8. The thermal well steam injection insulation compensator according to claim 2, characterized in that: The connecting plate (408) is located inside the central column (7), and a mounting ring matching the sealing buffer pad (8) is provided inside the pipe column (1).

9. The thermal well steam injection insulation compensator according to claim 1, characterized in that: The right side of the packer connector (5) is movably connected to the left side of the connector (6), and the right side of the connector (6) is movably connected to the left side of the center column (7).

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