A cyclone inlet separator for a rod pumped well

Abstract

This invention relates to a cyclone-type inlet separator for pumped oil wells, used for downhole oil-water separation. The separator mainly consists of an upper flow channel connector, a middle flow channel connector, and a lower flow channel connector. The upper flow channel connector mainly includes a primary outer shell, a primary cyclone separator, a primary spiral flow channel accelerating cylinder, and an upper connecting clip. The middle flow channel connector mainly includes a secondary outer shell, a secondary spiral flow channel accelerating cylinder, and upper-middle and lower-middle connecting clips. The lower flow channel connector mainly includes a secondary cyclone separator and a lower connecting clip. The double-cone cyclone separator and spiral flow channel accelerating cylinder enable rapid downhole oil-water separation. The lower flow channel connector has a drain outlet to return the separated formation water to the wellbore injection layer. This cyclone-type inlet separator for pumped oil wells has a stable structure, good sealing performance, improves oil-water separation efficiency, enables formation water reinjection, and reduces energy consumption. It is a reliable downhole device for oil-water separation with significant economic benefits.

Description

Technical Field

[0001] This invention relates to a cyclone inlet separator for a pumped oil well, specifically to a downhole cyclone oil-water separation device. Background Technology

[0002] Currently, many oilfields in my country have entered the mid-to-late stages of development, gradually losing their self-flowing capability and transitioning to mechanical oil production. Furthermore, many oilfields have entered the medium-to-high water-cut extraction stage, leading to a continuous increase in the water content of crude oil and a decline in economic efficiency. During the lifting process, large amounts of water are produced, reducing system efficiency and increasing the difficulty of oil-water separation at the surface. Therefore, it is necessary to install a matching oil-water separation device. However, existing downhole oil-water separation devices have low processing efficiency. Thus, it is necessary to design a downhole oil-water separation device with high separation efficiency, high reinjection efficiency, reduced energy consumption, and energy conservation, achieving downhole separation of oil and water, with the separated oil discharged upwards and the separated formation water reinjected, achieving the goal of "more oil production, less water production, and reduced energy consumption." Summary of the Invention

[0003] In order to overcome the shortcomings of existing oil-water separators, such as low processing efficiency and environmental pollution, the purpose of this patent is to provide a downhole oil-water separation device with high oil production efficiency, high reinjection efficiency, energy saving, and reduced energy consumption, so as to achieve "more oil production, less water production, and energy saving".

[0004] To achieve the above objectives, the technical solution adopted in this patent is: a cyclone inlet separator for a pumped oil well, comprising: an upper flow channel connector, a first-stage spiral flow channel accelerating cylinder, a first-stage cyclone separator, a first-stage outer shell, an inner shell isolation cylinder, a middle flow channel connector, a second-stage spiral flow channel accelerating cylinder, a second-stage outer shell, a lower flow channel connector, a second-stage cyclone separator, an upper connecting buckle, a middle-upper connecting buckle, a middle-lower connecting buckle, a lower connecting buckle, a sealing ring for the first-stage spiral flow channel accelerating cylinder, and a sealing ring for the upper flow channel connector. Sealing rings, upper sealing ring of inner shell isolation cylinder, upper sealing ring of primary outer shell, lower sealing ring of primary outer shell, lower sealing ring of inner shell isolation cylinder, upper sealing ring of middle flow channel connector, lower sealing ring of middle flow channel connector, sealing ring of secondary spiral flow channel acceleration cylinder, upper sealing ring of secondary outer shell, lower sealing ring of secondary outer shell, sealing ring of lower flow channel connector, primary overflow channel, secondary overflow channel, primary collection liquid channel, secondary collection liquid channel, primary drainage channel, and secondary drainage channel;

[0005] Its features include: the upper flow channel connector and the first-stage spiral flow channel accelerator are connected by adhesive bonding; the upper flow channel connector and the first-stage outer shell are connected by an upper connecting buckle; a first-stage spiral flow channel accelerator sealing ring is provided between the upper flow channel connector and the first-stage spiral flow channel accelerator; an upper flow channel connector sealing ring is provided between the upper flow channel connector and the upper connecting buckle; an upper sealing ring for the first-stage outer shell is provided between the first-stage outer shell and the upper connecting buckle; the lower end of the upper flow channel connector is connected to the inner shell isolation cylinder; an upper sealing ring for the inner shell isolation cylinder is provided between the lower end of the upper flow channel connector and the inner shell isolation cylinder; the first-stage hydrocyclone is connected to the upper flow channel connector by adhesive bonding; and the first-stage hydrocyclone is connected to the first-stage spiral flow channel accelerator by adhesive bonding.

[0006] The middle flow channel connector is connected to the primary outer shell via an upper middle connecting buckle. The middle flow channel connector is connected to the tail of the inner shell isolation cylinder via an annular groove. The middle flow channel connector is connected to the tail of the primary hydrocyclone via an annular conical surface. A lower sealing ring of the primary outer shell is provided between the primary outer shell and the upper middle connecting buckle. A lower sealing ring of the inner shell isolation cylinder is provided between the tail of the inner shell isolation cylinder and the middle flow channel connector. An upper sealing ring of the middle flow channel connector is provided between the middle flow channel connector and the upper middle connecting buckle. The middle flow channel connector is connected to the secondary spiral flow channel acceleration cylinder by adhesive bonding. The middle flow channel connector is connected to the secondary outer shell via a lower middle connecting buckle. The middle flow channel connector is connected to the secondary hydrocyclone by adhesive bonding. A lower sealing ring of the middle flow channel connector is provided between the middle flow channel connector and the lower middle connecting buckle. A sealing ring of the secondary spiral flow channel acceleration cylinder is provided between the middle flow channel connector and the secondary spiral flow channel acceleration cylinder. An upper sealing ring of the secondary outer shell is provided between the secondary outer shell and the lower middle connecting buckle.

[0007] The lower flow channel connector is connected to the secondary housing via a lower connecting buckle. The lower flow channel connector is connected to the tail cone surface of the secondary hydrocyclone. A lower sealing ring for the secondary housing is provided between the secondary housing and the lower connecting buckle. A sealing ring for the lower flow channel connector is provided between the lower flow channel connector and the lower connecting buckle.

[0008] The upper boss of the first-stage spiral flow channel accelerator is bonded to the groove of the upper flow channel connector. The lower spiral section of the first-stage spiral flow channel accelerator is directly inserted into the cylindrical section of the first-stage hydrocyclone, and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the first-stage hydrocyclone. The upper boss of the second-stage spiral flow channel accelerator is bonded to the groove of the middle flow channel connector. The lower spiral section of the second-stage spiral flow channel accelerator is directly inserted into the cylindrical section of the second-stage hydrocyclone, and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the second-stage hydrocyclone.

[0009] The primary collection liquid channel is connected to the secondary collection liquid channel. The secondary collection liquid channel separates the collected liquid into the secondary overflow channel and the secondary drainage channel through a secondary hydrocyclone. The primary collection liquid channel separates the collected liquid into the primary overflow channel and the primary drainage channel through a primary hydrocyclone. The secondary overflow channel and the primary overflow channel are connected at the upper channel joint. The secondary drainage channel and the primary drainage channel are connected at the lower channel joint.

[0010] The secondary collection liquid channel transports the collection liquid upwards. Part of the collection liquid is separated into oil and water phases after passing through the secondary spiral flow channel accelerator and the secondary hydrocyclone. The oil phase continues to be transported upwards through the secondary overflow channel, while the water phase is transported downwards through the secondary drainage channel. The remaining collection liquid is transported upwards through the primary collection liquid channel. After passing through the primary spiral flow channel accelerator and the primary hydrocyclone, the remaining collection liquid is separated into oil and water phases. The oil phase is transported upwards through the primary overflow channel and merges with the oil phase in the secondary overflow channel at the upper outlet of the separator. The water phase is transported downwards through the primary drainage channel and merges with the water phase in the secondary drainage channel at the lower outlet of the separator. Attached Figure Description

[0011] Figure 1 This is a two-dimensional planar sectional view of this patent;

[0012] Figure 2 This is a partial two-dimensional planar sectional view of this patent;

[0013] Figure 3 This is a partial two-dimensional cross-sectional view of this patent;

[0014] Figure 4 This is a three-dimensional schematic diagram of a hydrocyclone.

[0015] Figure 5 This is a three-dimensional schematic diagram of a spiral accelerator.

[0016] Figure 6 A three-dimensional schematic diagram of the central flow channel connector;

[0017] Figure 1In the middle section: 1—Upper flow channel connector, 2—First-stage spiral flow channel accelerator, 3—First-stage cyclone separator, 4—First-stage outer shell, 5—Inner shell isolation cylinder, 6—Middle flow channel connector, 7—Second-stage spiral flow channel accelerator, 8—Second-stage outer shell, 9—Lower flow channel connector, 10—Second-stage cyclone separator, B1—Upper connecting buckle, B2—Upper middle connecting buckle, B3—Lower middle connecting buckle, B4—Lower connecting buckle, S1—First-stage spiral flow channel accelerator sealing ring, S2—Upper flow channel connector sealing ring, S3—Upper inner shell isolation cylinder sealing ring, S4—Upper part of the first-stage outer shell. S5—Lower sealing ring of primary outer shell, S6—Lower sealing ring of inner shell isolation cylinder, S7—Upper sealing ring of middle flow channel connector, S8—Lower sealing ring of middle flow channel connector, S9—Secondary spiral flow channel acceleration cylinder sealing ring, S10—Upper sealing ring of secondary outer shell, S11—Lower sealing ring of secondary outer shell, S12—Lower flow channel connector sealing ring, P1—Primary overflow flow channel, P2—Secondary overflow flow channel, P3—Primary collection liquid flow channel, P4—Secondary collection liquid flow channel, P5—Primary drainage flow channel, P6—Secondary drainage flow channel. Detailed Implementation

[0018] The overall structural schematic diagram of this patent is as follows: Figure 1 As shown, it includes: upper flow channel connector 1, first-stage spiral flow channel accelerator 2, first-stage cyclone separator 3, first-stage outer shell 4, inner shell isolation cylinder 5, middle flow channel connector 6, second-stage spiral flow channel accelerator 7, second-stage outer shell 8, lower flow channel connector 9, second-stage cyclone separator 10, upper connecting buckle B1, upper middle connecting buckle B2, lower middle connecting buckle B3, lower connecting buckle B4, first-stage spiral flow channel accelerator sealing ring S1, upper flow channel connector sealing ring S2, upper inner shell isolation cylinder sealing ring S3, and upper sealing ring of the first-stage outer shell. Sealing ring S4, lower sealing ring of primary outer shell S5, lower sealing ring of inner shell isolation cylinder S6, upper sealing ring of middle flow channel connector S7, lower sealing ring of middle flow channel connector S8, sealing ring of secondary spiral flow channel acceleration cylinder S9, upper sealing ring of secondary outer shell S10, lower sealing ring of secondary outer shell S11, sealing ring of lower flow channel connector S12, primary overflow flow channel P1, secondary overflow flow channel P2, primary collection liquid flow channel P3, secondary collection liquid flow channel P4, primary drainage flow channel P5, secondary drainage flow channel P6;

[0019] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The upper flow channel connector 1 and the first-stage spiral flow channel accelerator 2 are connected by adhesive bonding. The upper flow channel connector 1 and the first-stage outer shell 4 are connected by the upper connecting buckle B1, and the boss of the upper flow channel connector 1 and the boss of the upper connecting buckle B1 are locked together. A first-stage spiral flow channel accelerator sealing ring S1 is provided between the upper flow channel connector 1 and the first-stage spiral flow channel accelerator 2. An upper flow channel connector sealing ring S2 is provided between the upper flow channel connector 1 and the upper connecting buckle B1. An upper sealing ring S4 of the first-stage outer shell is provided between the first-stage outer shell 4 and the upper connecting buckle B1. The lower end of the upper flow channel connector 1 is connected to the inner shell isolation cylinder 5. An upper sealing ring S3 of the inner shell isolation cylinder is provided between the lower end of the upper flow channel connector 1 and the inner shell isolation cylinder 5. The first-stage cyclone separator 3 is connected to the upper flow channel connector 1 by adhesive bonding. The first-stage cyclone separator 3 is connected to the first-stage spiral flow channel accelerator 2 by adhesive bonding.

[0020] The middle flow channel connector 6 is connected to the primary outer shell 4 via the upper middle connecting buckle B2, and the boss of the primary outer shell 4 is locked with the boss of the upper middle connecting buckle B2. The middle flow channel connector 6 is connected to the tail of the inner shell isolation cylinder 5 via an annular groove, and the middle flow channel connector 6 is connected to the tail of the primary hydrocyclone 3 via an annular conical surface. A lower sealing ring S5 of the primary outer shell is provided between the primary outer shell 4 and the upper middle connecting buckle B2. A lower sealing ring S6 of the inner shell isolation cylinder is provided between the tail of the inner shell isolation cylinder 5 and the middle flow channel connector 6. An upper sealing ring S7 of the middle flow channel connector head is provided between the middle flow channel connector 6 and the upper middle connecting buckle B2. The middle flow channel connector 6 is bonded to the secondary spiral flow channel accelerator 7. The middle flow channel connector 6 is bonded to the secondary outer shell 8 through the lower middle connecting buckle B3. The boss of the secondary outer shell 8 is locked to the boss of the lower middle connecting buckle B3. The middle flow channel connector 6 is bonded to the secondary hydrocyclone 10. A lower sealing ring S8 of the middle flow channel connector is provided between the middle flow channel connector 6 and the lower middle connecting buckle B3. A sealing ring S9 of the secondary spiral flow channel accelerator is provided between the middle flow channel connector 6 and the secondary spiral flow channel accelerator 7. An upper sealing ring S10 of the secondary outer shell is provided between the secondary outer shell 8 and the lower middle connecting buckle B3.

[0021] The lower flow channel connector 9 is connected to the secondary housing 8 via the lower connecting buckle B4, and the boss of the lower flow channel connector 9 is locked with the boss of the lower connecting buckle B4. The lower flow channel connector 9 is connected to the tail of the secondary hydrocyclone 10 via an annular conical surface. A lower sealing ring S11 for the secondary housing 8 is provided between the secondary housing 8 and the lower connecting buckle B4, and a lower flow channel connector sealing ring S12 is provided between the lower flow channel connector 9 and the lower connecting buckle B4.

[0022] The primary cyclone separator 3 and the inner shell isolation cylinder 5 inside the primary outer shell 4 are pressed and fixed by the thread pre-tightening force of the upper connecting buckle B1 and the middle upper connecting buckle B2; the secondary cyclone separator 10 inside the secondary outer shell 8 is pressed and fixed by the thread pre-tightening force of the middle lower connecting buckle B3 and the lower connecting buckle B4.

[0023] The lower spiral section of the first-stage spiral flow channel accelerator 2 is directly inserted into the cylindrical section of the first-stage hydrocyclone 3, and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the first-stage hydrocyclone 3; the lower spiral section of the second-stage spiral flow channel accelerator 7 is directly inserted into the cylindrical section of the second-stage hydrocyclone 10, and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the second-stage hydrocyclone 10, ensuring that almost all fluids are tangentially accelerated, preventing side leakage, and avoiding short-circuit flow;

[0024] During operation, the collected liquid enters through the inlet of the secondary collected liquid channel P4. A portion of the collected liquid flows upwards into the secondary spiral flow channel accelerator 7 and the secondary hydrocyclone 10. After tangential acceleration, the collected liquid separates into an oil phase and a water phase. The oil phase continues upwards into the inner cavity of the inner shell isolation cylinder 5 and enters the secondary overflow channel P2, while the water phase flows downwards to the tail end of the inner cavity of the secondary hydrocyclone 10 and enters the secondary drainage channel P6. The remaining collected liquid enters the primary collected liquid channel P3 and continues upwards into the primary spiral flow channel accelerator. 2 and the first-stage hydrocyclone 3, after the collected liquid is tangentially accelerated, it is separated into an oil phase and a water phase. The oil phase continues to be transported upward to the inner cavity of the first-stage spiral flow channel acceleration cylinder 2 and enters the first-stage overflow channel P1, while the water phase is transported downward to the inner cavity of the second-stage outer shell 8 and enters the first-stage drainage channel P5. The oil phase entering the first-stage overflow channel P1 and the oil phase entering the second-stage overflow channel P2 merge at the upper outlet of the separator, and the water phase entering the first-stage drainage channel P5 and the water phase entering the second-stage drainage channel P6 merge at the lower outlet of the separator.

Claims

1. A turbocurrent inlet separator for a rod pumped well, comprising: The upper flow channel joint (1), the first spiral flow channel accelerating cylinder (2), the first cyclone (3), the first outer shell (4), the inner shell isolation cylinder (5), the middle flow channel joint (6), the second spiral flow channel accelerating cylinder (7), the second outer shell (8), the lower flow channel joint (9), the second cyclone (10), the upper connection buckle (B1), the middle upper connection buckle (B2), the middle lower connection buckle (B3), the lower connection buckle (B4), the first spiral flow channel accelerating cylinder sealing ring (S1), the upper flow channel joint sealing ring (S2), the inner shell isolation cylinder upper sealing ring (S3), the first outer shell upper sealing ring (S4), the first outer shell lower sealing ring (S5), the inner shell isolation cylinder lower sealing ring (S6), the middle flow channel joint upper sealing ring (S7), the middle flow channel joint lower sealing ring (S8), the second spiral flow channel accelerating cylinder sealing ring (S9), the second outer shell upper sealing ring (S10), the second outer shell lower sealing ring (S11), the lower flow channel joint sealing ring (S12), the first overflow flow channel (P1), the second overflow flow channel (P2), the first collection liquid flow channel (P3), the second collection liquid flow channel (P4), the first drainage flow channel (P5), the second drainage flow channel (P6); The upper flow channel joint (1) is connected with the first spiral flow channel accelerating cylinder (2) through bonding, the upper flow channel joint (1) is connected with the first outer shell (4) through the upper connection buckle (B1), a first spiral flow channel accelerating cylinder sealing ring (S1) is arranged between the upper flow channel joint (1) and the first spiral flow channel accelerating cylinder (2), an upper flow channel joint sealing ring (S2) is arranged between the upper flow channel joint (1) and the upper connection buckle (B1), a first outer shell upper sealing ring (S4) is arranged between the first outer shell (4) and the upper connection buckle (B1), the lower end of the upper flow channel joint (1) is connected with the inner shell isolation cylinder (5), an inner shell isolation cylinder upper sealing ring (S3) is arranged between the lower end of the upper flow channel joint (1) and the inner shell isolation cylinder (5), the first cyclone (3) is connected with the upper flow channel joint (1) through bonding, and the first cyclone (3) is connected with the first spiral flow channel accelerating cylinder (2) through bonding; The middle flow channel joint (6) is connected with the first outer shell (4) through a middle upper connection buckle (B2), the middle flow channel joint (6) is connected with the tail of the inner shell isolation cylinder (5) through an annular groove, the middle flow channel joint (6) is connected with the tail of the first cyclone (3) through an annular taper surface, a first outer shell lower sealing ring (S5) is arranged between the first outer shell (4) and the middle upper connection buckle (B2), an inner shell isolation cylinder lower sealing ring (S6) is arranged between the tail of the inner shell isolation cylinder (5) and the middle flow channel joint (6), a middle flow channel joint upper sealing ring (S7) is arranged between the middle flow channel joint (6) and the middle upper connection buckle (B2), the middle flow channel joint (6) is connected with the second spiral flow channel acceleration cylinder (7) through bonding, the middle flow channel joint (6) is connected with the second outer shell (8) through a middle lower connection buckle (B3), the middle flow channel joint (6) is bonded with the second cyclone (10), a middle flow channel joint lower sealing ring (S8) is arranged between the middle flow channel joint (6) and the middle lower connection buckle (B3), a second spiral flow channel acceleration cylinder sealing ring (S9) is arranged between the middle flow channel joint (6) and the second spiral flow channel acceleration cylinder (7), and a second outer shell upper sealing ring (S10) is arranged between the second outer shell (8) and the middle lower connection buckle (B3); The lower flow channel joint (9) is connected with the second outer shell (8) through a lower connection buckle (B4), the lower flow channel joint (9) is connected with the tail taper surface of the second cyclone (10), a second outer shell lower sealing ring (S11) is arranged between the second outer shell (8) and the lower connection buckle (B4), and a lower flow channel joint sealing ring (S12) is arranged between the lower flow channel joint (9) and the lower connection buckle (B4); The upper boss of the first spiral flow channel acceleration cylinder (2) is bonded with the groove of the upper flow channel joint (1), the lower spiral section flow channel of the first spiral flow channel acceleration cylinder (2) is directly inserted into the cylindrical section of the first cyclone (3), and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the first cyclone (3), the upper boss of the second spiral flow channel acceleration cylinder (7) is bonded with the groove of the middle flow channel joint (6), and the lower spiral section flow channel of the second spiral flow channel acceleration cylinder (7) is directly inserted into the cylindrical section of the second cyclone (10), and the lower part of the spiral flow channel is flush with the bottom end of the cylindrical section of the second cyclone (10); The first collection liquid flow channel (P3) is communicated with the second collection liquid flow channel (P4), the second collection liquid flow channel (P4) separates the collection liquid into the second overflow flow channel (P2) and the second drainage flow channel (P6) through the second cyclone (10), the first collection liquid flow channel (P3) separates the collection liquid into the first overflow flow channel (P1) and the first drainage flow channel (P5) through the first cyclone (3), the second overflow flow channel (P2) is communicated with the first overflow flow channel (P1) at the upper flow channel joint (1), and the second drainage flow channel (P6) and the first drainage flow channel (P5) are communicated at the lower flow channel joint (9). The secondary collection liquid flow channel (P4) transports the collection liquid upward, part of the collection liquid is separated and treated by the secondary spiral flow channel accelerating cylinder (7) and the secondary cyclone (10) to obtain oil phase and water phase, the oil phase is continuously transported upward by the secondary overflow flow channel (P2), and the water phase is transported downward by the secondary drainage flow channel (P6); the rest of the collection liquid is transported upward by the primary collection liquid flow channel (P3), the rest of the collection liquid is separated and treated by the primary spiral flow channel accelerating cylinder (2) and the primary cyclone (3) to obtain oil phase and water phase, the oil phase is transported upward by the primary overflow flow channel (P1) and is combined with the oil phase of the secondary overflow flow channel (P2) at the upper outlet of the separator, and the water phase is transported downward by the primary drainage flow channel (P5) and is combined with the water phase of the secondary drainage flow channel (P6) at the lower outlet of the separator.

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