Christmas tree and tubing hot fluid circulation device

Abstract

The present disclosure relates to the technical field of oil collection, and particularly relates to a Christmas tree oil pipe hot fluid circulation device and a Christmas tree. The present disclosure provides a Christmas tree oil pipe hot fluid circulation device, which comprises a connecting shell and a hot fluid circulation part. The hot fluid circulation part is arranged in a first circulating liquid containing space. The first circulating liquid containing space is defined as a plurality of first liquid inlet and outlet chambers. A circulating liquid interface is used for injecting or discharging circulating liquid into the first liquid inlet and outlet chambers. The hot fluid circulation part has a second circulating liquid containing space and a second oil pipe passage. The second oil pipe passage is in communication with the first oil pipe passage. The second circulating liquid containing space is defined as a plurality of second liquid inlet and outlet chambers. The second liquid inlet and outlet chambers are provided with liquid inlet and outlet circulation interfaces. The plurality of second liquid inlet and outlet chambers are in communication with corresponding first liquid inlet and outlet chambers through liquid inlet and outlet passages. By implementing the technical scheme of the present disclosure, the existing Christmas tree can be conveniently connected, the hot fluid can be effectively circulated, and the traditional oil well operation construction process is not changed.

Description

Technical Field

[0001] This disclosure relates to the field of oil extraction technology, and in particular to a hot fluid circulation device for a wellhead tubing and a wellhead. Background Technology

[0002] In the mechanical extraction stage after steam injection, the viscosity of heavy oil wells needs to be reduced so that the heavy oil can be better pumped to the surface.

[0003] Current viscosity reduction technologies for heavy oil wells mainly involve two aspects: one is to add a certain amount of light oil into the well to reduce viscosity, and the other is to use electric heating rods to heat the heavy oil to reduce viscosity.

[0004] The thickening process for heavy oil requires the introduction of thinner oil into the well, which can affect pump efficiency. The electric rod heating process requires thicker hollow rods, utilizing the skin effect to convert electrical energy into heat, resulting in low conversion efficiency and high energy consumption, thus impacting normal heavy oil production. Furthermore, the use of thicker sucker rods in electric rod heating also occupies space within the tubing, affecting the flowability of heavy oil. Using a dual-tube heating method for the well fluid can solve these problems. Currently, wells using dual-tube production require additional flow channels for both the production tree and the well section, necessitating more control valves, leading to high modification costs and cumbersome operation procedures. Summary of the Invention

[0005] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, in a first aspect of this disclosure, a hot fluid circulation device for a wellhead tubing is provided, comprising a connecting housing and a hot fluid circulation section. The connecting housing has a circulation fluid inlet, a first tubing passage, and a first circulation fluid accommodating space. The hot fluid circulation section is disposed within the first circulation fluid accommodating space, which is circumferentially defined as a plurality of isolated first inlet and outlet chambers. The circulation fluid inlet is used to inject or discharge circulation fluid into the first inlet and outlet chambers.

[0007] The hot fluid circulation section has a second circulating fluid accommodating space and a second oil pipe passage. The second oil pipe passage is connected to the first oil pipe passage. The second circulating fluid accommodating space is defined circumferentially along the second oil pipe passage as a plurality of isolated second inlet and outlet chambers. The second inlet and outlet chambers are provided with inlet and outlet circulation interfaces. The plurality of second inlet and outlet chambers are connected to the corresponding first inlet and outlet chambers through inlet and outlet passages.

[0008] In one feasible embodiment, the hot fluid circulation section includes an outer tube and an inner tube, the outer tube being sleeved on the inner tube, the second inlet / outlet liquid chamber being disposed in the inner tube, and both the outer tube and the inner tube being provided with the inlet / outlet liquid passage.

[0009] In one feasible implementation, the outer domain cylinder and the inner domain cylinder are in contact and sealed.

[0010] In one feasible implementation, the liquid inlet / outlet passage is disposed on the sidewall of the outer domain cylinder and the inner domain cylinder, and the liquid inlet / outlet passage is configured as an elongated opening extending circumferentially along the outer domain cylinder and the inner domain cylinder.

[0011] In one feasible implementation, one end of the outer tube is connected to the inner wall of the connecting housing, and the outer tube is arranged to overlap with the central axis of the first oil pipe passage.

[0012] In one feasible implementation, the number of the first inlet / outlet liquid chamber and the second inlet / outlet liquid chamber is set to two, with each of the two first inlet / outlet liquid chambers occupying half of the first circulating liquid accommodating space.

[0013] In one feasible implementation, the connecting housing is configured as a frustum shape.

[0014] In one feasible implementation, the inlet / outlet liquid circulation interface is disposed on the side wall of the connecting housing, and the inlet / outlet liquid circulation interface has a flow channel that slopes down from the top to the bottom of the connecting housing.

[0015] In one feasible implementation, the central axes of the first circulating fluid accommodating space, the second circulating fluid accommodating space, the first oil pipe passage, and the second oil pipe passage overlap.

[0016] A second aspect of this disclosure provides a treehouse, including the aforementioned treehouse tubing hot fluid circulation device.

[0017] Compared with the prior art, this disclosure has at least the following beneficial effects: The connecting shell of this disclosure, as part of the structure of a conventional wellhead, has a circulating fluid interface, a first tubing passage, and a first circulating fluid containment space. The inner tubing of the wellhead is disposed in the first tubing passage and passes through the first circulating containment space. Hot fluid is injected into the first circulating space via the circulating fluid interface. The hot fluid enters the second circulating fluid containment space through the inlet and outlet passages of the hot fluid circulation section to reduce the viscosity of the heavy oil in the tubing within the second tubing passage. The first circulating fluid containment space is defined circumferentially along the hot fluid circulation section as a plurality of isolated first inlet and outlet chambers. The second circulating fluid containment space is defined circumferentially along the second tubing passage. The second oil pipe passage is circumferentially defined as multiple isolated second inlet and outlet chambers. These multiple second inlet and outlet chambers are connected to corresponding first inlet and outlet chambers through inlet and outlet passages. One of the first inlet and outlet chambers and the corresponding second inlet and outlet chambers is designated as the oil inlet chamber, and the other is designated as the outlet circulation chamber. The inlet and outlet circulation interface in the oil inlet chamber and the inlet and outlet circulation interface in the outlet circulation chamber are connected through circulation pipelines. External equipment provides the force required for circulation to achieve the circulation of hot fluid without the need to add more control valves, reducing modification costs and simplifying the complicated operation procedures. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a schematic cross-sectional view of the structure disclosed herein;

[0022] Figure 2 This is one of the three-dimensional structural schematic diagrams of this disclosure;

[0023] Figure 3 This is a top view of the internal structure of the tube in this disclosure;

[0024] Figure 4This is the second schematic diagram of the three-dimensional structure disclosed herein;

[0025] Figure 5 This is a perspective structural diagram of the present disclosure.

[0026] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0027] 100-oil pipe;

[0028] 1-Connecting shell; 11-Circulating fluid interface; 12-First oil pipe passage; 13-First circulating fluid accommodating space; 131-First inlet / outlet fluid chamber; 2-Hot fluid circulation part; 21-Second circulating fluid accommodating space; 22-Second oil pipe passage; 211-Second inlet / outlet fluid chamber; 212-Inlet / outlet fluid circulation interface; 213-Inlet / outlet fluid passage; 23-Outer chamber; 24-Inner chamber. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0030] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0031] Currently, the thick oil blending and viscosity reduction process requires the introduction of thinner oil into the well, which affects the pump efficiency. The electric rod heating process requires thicker hollow rods, utilizing the skin effect to convert electrical energy into heat energy, resulting in low conversion efficiency and high energy consumption, thus impacting normal heavy oil production. Furthermore, the use of thicker sucker rods in electric rod heating also occupies space within the tubing, affecting the flowability of the heavy oil. Using a dual-tube heating method for the well fluid can solve these problems. Currently, for wells using dual-tube production, both the production tree and the well section require additional flow channels, necessitating more control valves, resulting in high modification costs and cumbersome operation procedures.

[0032] Based on this, the present disclosure provides a hot fluid circulation device for the tubing of a wellhead. The connecting housing of this disclosure is part of the existing wellhead structure, and it has a circulating fluid interface, a first tubing passage, and a first circulating fluid containment space. The inner tubing of the wellhead is disposed in the first tubing passage and passes through the first circulating containment space. Hot fluid is injected into the first circulating space via the circulating fluid interface. The hot fluid enters the second circulating fluid containment space through the inlet and outlet passages of the hot fluid circulation section to reduce the viscosity of the heavy oil in the tubing within the second tubing passage. The first circulating fluid containment space is defined circumferentially along the hot fluid circulation section as a plurality of isolated first inlet and outlet chambers. The second circulating fluid containment space... The space is defined circumferentially along the second oil pipe passage as multiple isolated second inlet and outlet chambers. These multiple second inlet and outlet chambers are connected to corresponding first inlet and outlet chambers through inlet and outlet passages. One of the first inlet and outlet chambers and the corresponding second inlet and outlet chamber is set as an oil inlet chamber, and the other is set as an outlet circulation chamber. The inlet and outlet circulation interface in the oil inlet chamber is connected to the inlet and outlet circulation interface in the outlet circulation chamber through a circulation pipeline. External equipment provides the force required for circulation to achieve the circulation of hot fluid without the need to add more control valves, reducing modification costs and simplifying the complicated operation procedures.

[0033] The following is a detailed description of the oil well tubing hot fluid circulation device through specific embodiments:

[0034] Reference Figures 1 to 5 As shown, a first aspect of this disclosure provides a hot fluid circulation device for a wellhead tubing, including a connecting housing 1 and a hot fluid circulation section 2. The connecting housing 1 has a circulation fluid inlet 11, a first tubing passage 12, and a first circulation fluid accommodating space 13. The hot fluid circulation section 2 is disposed within the first circulation fluid accommodating space 13. The first circulation fluid accommodating space 13 is defined circumferentially along the hot fluid circulation section 2 as a plurality of isolated first inlet / outlet chambers 131. The circulation fluid inlet 11 is used to inject or discharge circulation fluid into the first inlet / outlet chambers 131. The hot fluid circulation section 2 has a second circulation fluid accommodating space 21 and a second tubing passage 22. The second tubing passage 22 is connected to the first tubing passage 12. The second circulation fluid accommodating space 21 is defined circumferentially along the second tubing passage 22 as a plurality of isolated second inlet / outlet chambers 211. The second inlet / outlet chambers 211 are provided with inlet / outlet circulation inlets 212. The plurality of second inlet / outlet chambers 211 are connected to the corresponding first inlet / outlet chambers 131 through the inlet / outlet passages 213.

[0035] The connecting housing 1 of this disclosure serves as part of the existing wellhead structure. It has a circulating fluid interface 11, a first tubing passage 12, and a first circulating fluid accommodating space 13. The inner tubing 100 of the wellhead is disposed in the first tubing passage 12 and passes through the first circulating space 13. Hot fluid is injected into the first circulating space 13 through the circulating fluid interface 11. The hot fluid enters the second circulating fluid accommodating space 21 through the inlet / outlet fluid passage 213 of the hot fluid circulation section, thereby reducing the viscosity of the heavy oil in the tubing 100 within the second tubing passage 22.

[0036] The first circulating fluid accommodating space 13 is defined circumferentially along the hot fluid circulation section 2 as a plurality of isolated first inlet and outlet chambers 131, and the second circulating fluid accommodating space 21 is defined circumferentially along the second oil pipe passage 22 as a plurality of isolated second inlet and outlet chambers 211. The plurality of second inlet and outlet chambers 211 are connected to the corresponding first inlet and outlet chambers 131 through inlet and outlet passages 213. Specifically, one of the plurality of first inlet and outlet chambers 131 and one of the corresponding second inlet and outlet chambers 211 are set as an oil inlet chamber, and another one of the first inlet and outlet chambers and one of the corresponding second inlet and outlet chambers are set as an outlet circulation chamber. The inlet and outlet circulation interface 212 in the oil inlet chamber and the inlet and outlet circulation interface 212 in the outlet circulation chamber are connected through a circulation pipeline. External equipment provides the force required for circulation to realize the circulation of hot fluid, without the need to add more control valves, reducing modification costs and simplifying the complicated operation procedures.

[0037] Specifically, multiple first inlet / outlet liquid chambers 131 can be evenly distributed circumferentially in the hot fluid circulation section 2, and the multiple first inlet / outlet liquid chambers 131 equally divide the volume of the first circulating liquid accommodating space 13. Alternatively, a suitable number can be set at any position within the first circulating liquid accommodating space 13 according to actual usage requirements. Specifically, this disclosure describes multiple first inlet / outlet liquid chambers 131 being evenly distributed circumferentially in the hot fluid circulation section 2, and the multiple first inlet / outlet liquid chambers 131 equally dividing the volume of the first circulating liquid accommodating space 13. It can be understood that the first inlet / outlet liquid chamber 131 is the remaining position of the first circulating liquid accommodating space 13 excluding the position occupied by the hot fluid circulation section 2. The first inlet / outlet liquid chamber 131 and the second inlet / outlet liquid chamber 211 have an inner and outer structure. After the hot fluid enters the first inlet / outlet liquid chamber 131, it flows into the second inlet / outlet liquid chamber 211. The circulated hot fluid then enters the first inlet / outlet liquid chamber 131 from the second inlet / outlet liquid chamber 211 and then exits through the connecting housing 1 into external equipment. Furthermore, the multiple first liquid inlet / outlet chambers 131 and second liquid inlet / outlet chambers 211 can be separated by partitions, baffles, etc.

[0038] In some embodiments, the hot fluid circulation section 2 includes an outer tube 23 and an inner tube 24. The outer tube 23 is sleeved on the inner tube 24, and a second inlet / outlet liquid chamber 211 is disposed in the inner tube 24. Both the outer tube 23 and the inner tube 24 are provided with inlet / outlet liquid passages 213.

[0039] In this embodiment, the hot fluid circulation unit 2 includes an outer cylinder 23 and an inner cylinder 24. The outer cylinder 23 is fitted onto the inner cylinder 24 during assembly. Both the outer cylinder 23 and the inner cylinder 24 are provided with inlet and outlet fluid passages 213. This allows the outer cylinder 23 and the inner cylinder 24 to partially or completely block the inlet and outlet fluid passages 213 when rotated relative to each other after fitting, thereby increasing the convenience of inspection and maintenance. Furthermore, the opening of the inlet and outlet fluid passages 213 can be adjusted by rotating the outer cylinder 23 and the inner cylinder 24 to regulate the flow rate and leakage of the hot fluid, thereby controlling the viscosity of the oil. Specifically, if the outer cylinder 23 and the inner cylinder 24 are located inside the connecting housing 1 and cannot be manually operated, they can be rotated and adjusted electrically. For example, a turntable can be used to rotate the outer cylinder 23 while keeping the inner cylinder 24 relatively fixed. Furthermore, the outer cylinder 23 and the inner cylinder 24 are sealed in contact. The sealing method can be a damping connection to seal the part where the two are fitted together, or a sealing ring can be provided on the outer wall of the outer cylinder 23 and / or the inner cylinder 24 to prevent the leakage of hot fluid.

[0040] In some embodiments, the liquid inlet / outlet passage 213 is disposed on the sidewall of the outer cylinder 23 and the inner cylinder 24, and the liquid inlet / outlet passage 213 is configured as an elongated opening extending circumferentially along the outer cylinder 23 and the inner cylinder 24.

[0041] In this embodiment, the liquid inlet / outlet passage 213 is disposed on the sidewalls of the outer cylinder 23 and the inner cylinder 24, and the liquid inlet / outlet passage 213 is configured as an elongated opening extending circumferentially along the outer cylinder 23 and the inner cylinder 24 to provide a larger adjustment range.

[0042] In some embodiments, one end of the outer tube 23 is connected to the inner wall of the connecting housing 1, and the outer tube 23 is arranged to overlap with the central axis of the first oil pipe passage 12.

[0043] In this embodiment, one end of the outer tube 23 is connected to the inner wall of the connecting housing 1, and the outer tube 23 overlaps with the central axis of the first oil pipe passage 12. This arrangement allows the outer tube 23 to be used as a guide, and assembly can be achieved by simply aligning the outer tube 23 and the inner tube 24 on the connecting housing 1, thereby improving installation efficiency.

[0044] In some embodiments, the number of the first inlet / outlet liquid chamber 131 and the second inlet / outlet liquid chamber 211 is set to two, and the two first inlet / outlet liquid chambers 131 each occupy half of the first circulating liquid accommodating space 13.

[0045] In this embodiment, the number of the first inlet / outlet liquid chamber 131 and the second inlet / outlet liquid chamber 211 disclosed herein is set to two, that is, the first circulating liquid accommodating space 13 and the second circulating liquid accommodating space 21 are divided into two parts, one half of which serves as the inlet chamber and the other half as the outlet circulating chamber. To facilitate the circulation of hot fluid, the inlet chambers of the first circulating liquid accommodating space 13 and the second circulating liquid accommodating space 21 are on the same side, and the opposite side is also an outlet chamber.

[0046] In some embodiments, the connecting housing 1 is configured as a frustum shape to facilitate assembly with the main assembly of the wellhead.

[0047] In some embodiments, the inlet / outlet liquid circulation interface 212 is disposed on the side wall of the connecting housing 1, and the inlet / outlet liquid circulation interface has a flow channel that slopes from the top to the bottom of the connecting housing 1.

[0048] In this embodiment, the inlet / outlet liquid circulation interface 212 is disposed on the side wall of the connecting housing 1. The connecting housing 1 has a certain thickness, and the flow channel of the inlet / outlet liquid circulation interface 212 is within this thickness range. The flow channel slopes from the top to the bottom of the connecting housing 1 to facilitate the injection of hot fluid and prevent backflow.

[0049] In some embodiments, the central axes of the first circulating fluid accommodating space 13, the second circulating fluid accommodating space 21, the first oil pipe passage 12, and the second oil pipe passage 22 are arranged to overlap.

[0050] In the above embodiments, the central axes of the first circulating fluid accommodating space 13, the second circulating fluid accommodating space 21, the first oil pipe passage 12, and the second oil pipe passage 22 are arranged to overlap, that is, the first circulating fluid accommodating space 13, the second circulating fluid accommodating space 21, the first oil pipe passage 12, and the second oil pipe passage 22 are vertically connected to facilitate assembly.

[0051] A second aspect of this disclosure provides a treehouse, including the aforementioned treehouse tubing hot fluid circulation device.

[0052] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0053] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0054] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A hot fluid circulation device for oil well tubing, characterized in that, The system includes a connecting housing and a hot fluid circulation section. The connecting housing has a circulating fluid interface, a first oil pipe passage, and a first circulating fluid accommodating space. The hot fluid circulation section is disposed within the first circulating fluid accommodating space. The first circulating fluid accommodating space is defined circumferentially along the hot fluid circulation section as a plurality of isolated first inlet and outlet chambers. The circulating fluid interface is used to inject or discharge circulating fluid into the first inlet and outlet chambers. The hot fluid circulation section has a second circulating fluid accommodating space and a second oil pipe passage. The second oil pipe passage is connected to the first oil pipe passage. The second circulating fluid accommodating space is defined circumferentially along the second oil pipe passage as a plurality of isolated second inlet and outlet chambers. The second inlet and outlet chambers are provided with inlet and outlet circulation interfaces. The plurality of second inlet and outlet chambers are connected to the corresponding first inlet and outlet chambers through inlet and outlet passages.

2. The oil wellhead tubing hot fluid circulation device according to claim 1, characterized in that, The hot fluid circulation section includes an outer tube and an inner tube, with the outer tube sleeved on the inner tube. The second inlet / outlet liquid chamber is disposed in the inner tube, and both the outer tube and the inner tube are provided with the inlet / outlet liquid passage.

3. The oil wellhead tubing hot fluid circulation device according to claim 2, characterized in that, The outer cylinder and the inner cylinder are in contact and sealed.

4. The oil wellhead tubing hot fluid circulation device according to claim 2, characterized in that, The liquid inlet / outlet passage is provided on the sidewalls of the outer and inner outer cylinders, and the liquid inlet / outlet passage is configured as an elongated opening extending circumferentially along the outer and inner outer cylinders.

5. The oil wellhead tubing hot fluid circulation device according to claim 2, characterized in that, One end of the outer tube is connected to the inner wall of the connecting housing, and the outer tube is arranged to overlap with the central axis of the first oil pipe passage.

6. The oil wellhead tubing hot fluid circulation device according to claim 1, characterized in that, The number of the first liquid inlet / outlet chamber and the second liquid inlet / outlet chamber is set to two, and each of the two first liquid inlet / outlet chambers occupies half of the first circulating liquid accommodating space.

7. The oil wellhead tubing hot fluid circulation device according to claim 1, characterized in that, The connecting housing is configured as a frustum shape.

8. The oil wellhead tubing hot fluid circulation device according to claim 1, characterized in that, The liquid inlet / outlet circulation interface is located on the side wall of the connecting housing, and the liquid inlet / outlet circulation interface has a flow channel that slopes down from the top to the bottom of the connecting housing.

9. The hot fluid circulation device for the wellhead tubing according to any one of claims 1 to 8, characterized in that, The central axes of the first circulating fluid accommodating space, the second circulating fluid accommodating space, the first oil pipe passage, and the second oil pipe passage overlap.

10. An oil wellhead, characterized in that, The oil well tubing hot fluid circulation device includes any one of claims 1 to 9.

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