A track-type composite air anchor

Abstract

The present invention relates to a track-type composite gas anchor, comprising a packer, a secondary liquid inlet joint, a lower spiral separation tube, a liquid outlet joint, an upper pipeline and a gas outlet joint connected in sequence from bottom to top; the lower spiral separation tube is sheathed with a lower outer tube, and the upper pipeline is provided with an upper outer tube on the outside; the internal channel of the packer, the main channel of the secondary liquid inlet joint, the spiral channel in the lower spiral separation tube, the main channel of the liquid outlet joint, the internal channel of the upper pipeline, and the gas outlet channel of the gas outlet joint are connected in sequence; the liquid inlet hole of the secondary liquid inlet joint, the annular channel between the lower spiral separation tube and the lower outer tube, the secondary channel of the liquid outlet joint, the annular channel between the upper pipeline and the upper outer tube, and the liquid outlet channel of the gas outlet joint are connected in sequence. The track-type composite gas anchor proposed by the present invention makes gas-liquid separation more complete and achieves a better gas prevention effect.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a track-type composite gas anchor. Background Art

[0002] Using a sucker rod pump is the most widely used oil production method in my country. However, as production progresses and the oilfield enters its later stages, the release of dissolved gas due to declining formation pressure and the release of injected gas due to gas injection can lead to the presence of large amounts of gas during the production process. For sucker rod pump systems, gas entering the pump barrel can affect pump efficiency and, in severe cases, even cause "gas lock," severely impacting well production.

[0003] Currently, anti-gas measures for rod pumps primarily include gas-liquid separators (gas anchors) and anti-gas pumping pumps. The commonly used gas anchors are structurally limited to single-stage separation, resulting in a single effect. While effective for wells with low gas-liquid ratios, they are inefficient for high-gas-liquid ratio wells. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention proposes a track-type composite air anchor, which enables more complete gas-liquid separation and achieves better anti-gas effect.

[0005] The technical solution of the present invention to solve the above problems is: a track type composite air anchor, which is special in that:

[0006] It includes a packer, a secondary liquid inlet joint, a lower spiral separation pipe, a liquid outlet joint, an upper pipeline and a gas outlet joint connected in sequence from bottom to top; the lower spiral separation pipe is sheathed with a lower outer pipe, and the upper pipeline is sheathed with an upper outer pipe;

[0007] A spiral channel is provided in the lower spiral separation tube; a liquid outlet channel is provided at one end of the gas outlet joint, and a gas outlet channel is provided at the other end, and a gas outlet hole is provided on the side wall surface, and the gas outlet hole is connected to the gas outlet channel; a main channel is provided in the center of the liquid outlet joint, and a secondary channel is provided in the axial direction of the side wall of the liquid outlet joint, and a liquid outlet hole is opened on the side wall surface, and the liquid outlet hole is connected to the main channel; the secondary liquid inlet joint includes a main channel, and a liquid inlet hole is provided on its side wall surface;

[0008] The internal channel of the packer, the main channel of the secondary liquid inlet joint, the spiral channel in the lower spiral separation tube, the main channel of the liquid outlet joint, the internal channel of the upper pipeline, and the gas outlet channel of the gas outlet joint are connected in sequence;

[0009] The liquid inlet hole of the secondary liquid inlet joint, the annular channel between the lower spiral separation tube and the lower outer tube, the secondary channel of the liquid outlet joint, the annular channel between the upper pipeline and the upper outer tube, and the liquid outlet channel of the gas outlet joint are connected in sequence.

[0010] After the oil and gas mixture enters the packer, it enters the lower spiral separation tube through the main channel of the secondary liquid inlet joint for oil and gas separation. The oil is discharged from the liquid outlet hole of the liquid outlet joint, and the gas continues to enter the upper pipeline through the main channel of the liquid outlet joint, and the gas is discharged from the gas outlet hole of the gas outlet joint; the oil enters from the liquid inlet hole of the secondary liquid inlet joint, passes through the annular channel between the lower spiral separation tube and the lower outer tube, the secondary channel of the liquid outlet joint, the annular channel between the upper pipeline and the upper outer tube, and the liquid outlet channel of the gas outlet joint before being discharged.

[0011] Furthermore, one end of the packer relative to the secondary liquid inlet joint is connected to a bubble breaking tube, and the bubble breaking tube comprises a tubular structure, at least one partition is provided inside the tubular structure, and a plurality of holes are opened on the partition.

[0012] Furthermore, the tail end of the bubble breaking tube is connected to the eye tube, which includes a tubular structure, one end of which is connected to the tail end of the bubble breaking tube and the other end is blocked, and a plurality of holes are provided on the side wall of the tubular structure.

[0013] Furthermore, the blocking end of the eye tube is blocked with a thread plug.

[0014] Furthermore, the bubble breaking tube and the eye tube are connected via a coupling.

[0015] Furthermore, it includes a middle liquid-passing joint, a middle spiral separation tube, and a middle outer tube; the middle liquid-passing joint has a main channel in the middle, and a secondary channel is provided in the axial direction on the side wall of the middle liquid-passing joint; the middle outer tube is sleeved on the middle spiral separation tube; the spiral channel of the lower spiral separation tube is connected to the main channel of the middle liquid-passing joint, and the spiral channel of the middle spiral separation tube is connected to the main channel of the liquid outlet joint in sequence;

[0016] The lower spiral separation tube is connected with the annular passage of the lower outer tube, the auxiliary passage of the middle liquid-passing joint, the middle spiral separation tube and the annular passage of the middle outer tube, and the auxiliary passage of the liquid outlet joint in sequence.

[0017] Furthermore, the above-mentioned packer is a track packer.

[0018] Furthermore, a spiral channel is provided in the upper pipe.

[0019] Furthermore, the upper outer tube is connected to the gas outlet joint and the liquid outlet joint by threads.

[0020] Furthermore, the middle outer tube, the lower outer tube and the intermediate liquid-passing joint are all connected by threads.

[0021] Advantages of the present invention:

[0022] The present invention provides a track-type composite gas anchor. The device is designed with a secondary flow channel (liquid outlet joint liquid outlet hole-secondary liquid inlet joint liquid inlet hole) on the basis of spiral separation. Gas and liquid are separated again in the secondary flow channel by gravity, so that the gas-liquid separation is more complete and a better gas prevention effect is achieved. Under the action of the bubble breaking tube, bubbles with larger diameters in the gas-liquid mixed flow are dispersed into bubbles with smaller diameters, thereby reducing the flow resistance of the oil-gas mixed phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the track-type composite air anchor provided by the present invention.

[0024] In the figure: 1-air outlet joint; 2-upper pipeline; 3-upper outer pipe; 4-liquid outlet joint; 5-middle spiral separation pipe; 6-middle outer pipe; 7-middle liquid passage joint; 8-lower spiral separation pipe; 9-lower outer pipe; 10-secondary liquid inlet joint; 11-packer; 12-bubble breaking pipe; 13-coupling; 14-eye tube. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is claimed, but merely represents selected embodiments of the present invention.

[0026] Example 1

[0027] See also Figure 1 The present invention provides a track-type composite gas anchor, comprising a packer 11, a secondary liquid inlet joint 10, a lower spiral separation tube 8, a liquid outlet joint 4, an upper pipeline 2 and a gas outlet joint 1 connected in sequence from bottom to top; a lower outer tube 9 is sleeved on the outside of the lower spiral separation tube 8, and an upper outer tube 3 is provided on the outside of the upper pipeline 2.

[0028] The lower spiral separation tube 8 has a spiral channel inside. The gas outlet connector 1 has a liquid outlet channel at one end and a gas outlet channel at the other end, with gas outlet holes on the sidewalls connecting to the gas outlet channel. The liquid outlet connector 4 has a main channel at its center, and a secondary channel axially arranged on the sidewalls of the liquid outlet connector 4, with liquid outlet holes on the sidewalls connecting to the main channel. The secondary liquid inlet connector 10 includes a main channel and a liquid inlet hole on its sidewalls. The upper outer tube 3 is threadedly connected to the gas outlet connector 1 and the liquid outlet connector 4.

[0029] The internal channel of the packer 11, the main channel of the secondary liquid inlet joint 10, the spiral channel in the lower spiral separation tube 8, the main channel of the liquid outlet joint 4, the internal channel of the upper pipeline 2, and the air outlet channel of the air outlet joint 1 are connected in sequence, and the channels connected in sequence are oil and gas separation channels.

[0030] The liquid inlet hole of the secondary liquid inlet joint 10, the annular channel between the lower spiral separation tube 8 and the lower outer tube 9, the secondary channel of the liquid outlet joint 4, the annular channel between the upper pipeline 2 and the upper outer tube 3, and the liquid outlet channel of the gas outlet joint 1 are connected in sequence, and the channels connected in sequence are the liquid outlet channels.

[0031] The rail-type composite gas anchor is secured within the casing via a packer 11, with the outlet channel of the gas outlet connector 1 connected to a wellbore pump. The function of the packer 11 is to divide the casing annulus, allowing the original gas-laden oil to enter through the channel below the packer 11 rather than directly through the inlet of the secondary inlet connector 10.

[0032] After the oil-gas mixture enters the packer 11, it enters the lower spiral separation tube 8 through the main channel of the secondary liquid inlet joint 10 for oil and gas separation. Due to the difference in gas-liquid density, the bubbles move upward along the spiral tube, and the oil moves upward along the outer edge of the center tube in the spiral separation tube under the action of centrifugal force. The oil is discharged from the liquid outlet hole of the liquid outlet joint 4, and the gas continues to enter the upper pipeline 2 through the main channel of the liquid outlet joint 4. The gas is discharged from the outlet hole of the gas outlet joint 1, and enters the oil casing annulus through the outlet hole on the gas outlet joint 1 and is discharged upward to the ground.

[0033] At the lower end of the upper pipe 2, the liquid flows out from the liquid outlet hole on the liquid outlet joint 4 into the oil casing annulus, and the gas that has not been separated in the liquid is separated again under the action of gravity. The gas is discharged upward from the oil casing annulus to the ground, and the liquid flows downward to the packer 11. Under the suction force of the oil well pump, the oil enters from the liquid inlet hole of the secondary liquid inlet joint 10, and passes through the annular channel between the lower spiral separation pipe 8 and the lower outer pipe 9, the secondary channel of the liquid outlet joint 4, the annular channel between the upper pipe 2 and the upper outer pipe 3, and the liquid outlet channel of the gas outlet joint 1 before entering the oil well pump.

[0034] In some embodiments of the present invention, see Figure 1 The lower end of the packer 11 is connected to the bubble breaking tube 12. The bubble breaking tube 12 includes a tubular structure. At least one partition is provided inside the tubular structure, and a plurality of holes are opened on the partition.

[0035] In some embodiments of the present invention, see Figure 1 The tail end of the bubble breaking tube 12 is connected to the eye tube 14. The eye tube 14 includes a tubular structure, one end of which is connected to the tail end of the bubble breaking tube 12 and the other end is blocked. A plurality of holes are opened on the side wall of the tubular structure.

[0036] Under the sealing of the packer 11, the oil-gas mixture enters from the eye tube 14 and then enters the bubble breaking tube. Under the action of the bubble breaking tube 12, the bubbles with larger diameters in the gas-liquid mixed flow are dispersed into bubbles with smaller diameters, thereby reducing the flow resistance of the oil-gas mixed phase. The mixed liquid that is initially separated by the bubble breaking tube 12 enters the lower spiral separation tube 8 through the packer 11.

[0037] In some embodiments of the present invention, the blocked end of the eye tube 14 may be blocked with a wire plug or directly welded with a steel plate.

[0038] In some embodiments of the present invention, the bubble breaking tube 12 and the eye tube 14 are connected by a coupling 13 .

[0039] In some embodiments of the present invention, a spiral channel is also provided inside the upper pipe 2 to further separate the liquid that may be contained in the gas.

[0040] Example 2

[0041] See also Figure 1 Compared to the above embodiment, this embodiment further includes an intermediate liquid transfer joint 7, a central spiral separation tube 5, and a central outer tube 6. The central portion of the intermediate liquid transfer joint 7 serves as a main channel, and the sidewalls of the intermediate liquid transfer joint 7 are provided with axially arranged secondary channels. The central outer tube 6 is sleeved onto the central spiral separation tube 5. The spiral channel of the lower spiral separation tube 8 is connected to the main channel of the intermediate liquid transfer joint 7, and the spiral channel of the central spiral separation tube 5 is connected to the main channel of the liquid outlet joint 4 in sequence.

[0042] The annular passage of the lower spiral separation tube 8 and the lower outer tube 9, the secondary passage of the middle liquid-passing joint 7, the annular passage of the middle spiral separation tube 5 and the middle outer tube 6, and the secondary passage of the liquid outlet joint 4 are connected in sequence.

[0043] The middle outer tube 6, the lower outer tube 9 and the middle liquid transfer joint 7 are all connected by threads.

[0044] In this embodiment, the added middle spiral separation tube 5 provides the track-type composite air anchor with an additional separation tube, extending the entire spiral channel and achieving more complete gas-liquid separation. The middle spiral separation tube 5 can be one or multiple in series.

[0045] In some embodiments of the present invention, the packer 11 is a track packer 11. The function of the packer 11 is to divide the oil casing annulus, allowing the original gas-containing oil to enter from the eye tube first instead of directly from the secondary liquid inlet joint. Other types of packers can be used here instead.

[0046] In summary, the present invention provides a track-type composite air anchor. The device is designed with a secondary flow channel (liquid outlet joint liquid outlet hole - secondary liquid inlet joint liquid inlet hole) on the basis of spiral separation. In the secondary flow channel, gas and liquid are separated again by gravity, making the gas-liquid separation more complete and achieving better anti-gas effect.

[0047] The above descriptions are merely embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied to other related system fields, are also included in the scope of protection of the present invention.

Claims

1. A track-type composite air anchor, characterized by: The invention comprises a packer (11), a secondary liquid inlet joint (10), a lower spiral separation pipe (8), a liquid outlet joint (4), an upper pipeline (2) and a gas outlet joint (1) which are sequentially connected from bottom to top; a lower outer pipe (9) is sleeved on the outside of the lower spiral separation pipe (8), and an upper outer pipe (3) is provided on the outside of the upper pipeline (2); A spiral channel is provided in the lower spiral separation tube (8); a liquid outlet channel is provided at one end of the gas outlet joint (1), and a gas outlet channel is provided at the other end, a gas outlet hole is provided on the side wall, and the gas outlet hole is connected to the gas outlet channel; a main channel is provided at the center of the liquid outlet joint (4), a secondary channel is provided in the axial direction of the side wall of the liquid outlet joint (4), a liquid outlet hole is provided on the side wall, and the liquid outlet hole is connected to the main channel; a secondary liquid inlet joint (10) includes a main channel, and a liquid inlet hole is provided on the side wall; The internal channel of the packer (11), the main channel of the secondary liquid inlet joint (10), the spiral channel in the lower spiral separation tube (8), the main channel of the liquid outlet joint (4), the internal channel of the upper pipeline (2), and the gas outlet channel of the gas outlet joint (1) are connected in sequence; The liquid inlet of the secondary liquid inlet joint (10), the annular passage between the lower spiral separation tube (8) and the lower outer tube (9), the secondary passage of the liquid outlet joint (4), the annular passage between the upper pipeline (2) and the upper outer tube (3), and the liquid outlet passage of the gas outlet joint (1) are connected in sequence; The track-type composite gas anchor is fixed in the casing through a packer (11), and the liquid outlet channel end of the gas outlet joint (1) is connected to the oil pump; After the oil-gas mixture enters the packer (11), it enters the lower spiral separation tube (8) through the main channel of the secondary liquid inlet joint (10) for oil-gas separation. Due to the difference in gas-liquid density, the bubbles move upward along the spiral tube, and the oil moves upward along the outer edge of the central tube in the spiral separation tube under the action of centrifugal force. The oil is discharged from the liquid outlet hole of the liquid outlet joint (4), and the gas continues to enter the upper pipeline (2) through the main channel of the liquid outlet joint (4). The gas is discharged from the gas outlet hole of the gas outlet joint (1), enters the oil casing annulus through the gas outlet hole on the gas outlet joint (1), and is discharged upward to the ground. At the lower end of the upper pipe (2), the liquid flows out from the liquid outlet hole on the liquid outlet joint (4) into the oil casing annulus, and the gas that has not been separated in the liquid is separated again under the action of gravity. The gas is discharged upward from the oil casing annulus to the ground, and the liquid flows downward to the packer (11). Under the action of the suction force of the oil well pump, the oil enters from the liquid inlet hole of the secondary liquid inlet joint (10), passes through the annular passage between the lower spiral separation pipe (8) and the lower outer pipe (9), the secondary passage of the liquid outlet joint (4), the annular passage between the upper pipe (2) and the upper outer pipe (3), and the liquid outlet passage of the gas outlet joint (1), and then enters the oil well pump; One end of the packer (11) relative to the secondary liquid inlet joint (10) is connected to a bubble breaking tube (12), and the bubble breaking tube (12) comprises a tubular structure, at least one partition is provided inside the tubular structure, and a plurality of holes are opened on the partition.

2. The track-type composite air anchor according to claim 1, characterized in that: The tail end of the bubble breaking tube (12) is connected to the eye tube (14), and the eye tube (14) comprises a tubular structure, one end of which is connected to the tail end of the bubble breaking tube (12) and the other end is blocked, and a plurality of holes are provided on the side wall of the tubular structure.

3. The track-type composite air anchor according to claim 2, characterized in that: The blocking end of the eye tube (14) is blocked by a thread plug.

4. The track-type composite air anchor according to claim 3, characterized in that: The bubble breaking tube (12) and the eye tube (14) are connected via a coupling (13).

5. A track-type composite air anchor according to any one of claims 1 to 4, characterized in that: It also includes a middle liquid-passing joint (7), a middle spiral separation tube (5), and a middle outer tube (6); the middle portion of the middle liquid-passing joint (7) is a main channel, and the side wall of the middle liquid-passing joint (7) is provided with a secondary channel arranged along the axial direction; the middle outer tube (6) is sleeved on the middle spiral separation tube (5); the spiral channel of the lower spiral separation tube (8) is connected to the main channel of the middle liquid-passing joint (7), and the spiral channel of the middle spiral separation tube (5) and the main channel of the liquid outlet joint (4) are connected in sequence; The annular passage of the lower spiral separation tube (8) and the lower outer tube (9), the secondary passage of the middle liquid-passing joint (7), the annular passage of the middle spiral separation tube (5) and the middle outer tube (6), and the secondary passage of the liquid outlet joint (4) are sequentially connected.

6. The track-type composite air anchor according to claim 5, characterized in that: The packer (11) is a track packer.

7. The track-type composite air anchor according to claim 1, characterized in that: A spiral channel is provided in the upper pipe (2).

8. The track-type composite air anchor according to claim 1, characterized in that: The upper outer tube (3) is connected to the gas outlet joint (1) and the liquid outlet joint (4) by threaded connection.

9. The track-type composite air anchor according to claim 5, characterized in that: The middle outer tube (6), the lower outer tube (9) and the middle liquid-passing joint (7) are all connected by threads.

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