Device matched with reciprocating electric submersible pump for casting and fishing

Abstract

The invention relates to the technical field of oil extraction equipment, and discloses reciprocating electric submersible pump matched throwing and fishing equipment which comprises a valve pipe, a casing pipe is arranged at the bottom of the valve pipe, a centralizer is arranged in the casing pipe, a bottom pipe is connected to the centralizer, an air gap protector is connected to the top of the bottom pipe, and the air gap protector is connected to the bottom of the valve pipe. The top of the air gap protector is connected with a linear motor, the linear motor is provided with a processing assembly, and the top of the processing assembly is connected with a bidirectional plunger pump. According to the reciprocating type electric submersible pump matched throwing and fishing equipment, effective separation of oil intake can be achieved through the arranged solid treatment device, attached impurities can be effectively removed from a sand prevention net through a cleaning and extruding device, and a sliding piece of a special structure can be used for conducting up-down circulating cleaning and meanwhile effectively removing impurities from the sand prevention net. And the oil is controlled to perform back flushing cleaning on the sieve pores, so that the effective filtering effect of the sand prevention net is further ensured, intake of sand and stones is avoided, and the operation stability of equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of oil production equipment technology, specifically to a device for launching and retrieving reciprocating submersible pumps. Background Technology

[0002] A submersible electric pump (SAP) is a multi-stage centrifugal pump that operates downhole. It is lowered into the well along with the tubing. Surface power is transmitted to the SSP motor via a transformer, control panel, and power cable. The SSP motor drives the multi-stage centrifugal pump to rotate, converting electrical energy into mechanical energy and lifting the well fluid to the surface.

[0003] Currently, when using electric reciprocating oil pumps for retrieval, existing technologies generally employ separators and sand filters to separate gas and sand from the oil, thus achieving the separation of impurities and gas. However, current separators cannot effectively isolate or separate gas from the oil, resulting in some air bubbles still entering the pump's interior, potentially causing airlock and affecting the normal operation of the equipment. Furthermore, current sand separation relies solely on the sand filter, but with prolonged use, the sand filter is prone to blockage, affecting oil suction. The ingestion of fine sand also hinders pump operation and causes blade wear and damage. Therefore, a reciprocating submersible electric pump paired with a retrieval device is proposed to address the aforementioned problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a reciprocating submersible electric pump with a retrieval device, which solves the problem that existing technologies cannot effectively eliminate sand and air bubbles in the oil, resulting in residual intake and damage to the pump's operation.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a reciprocating submersible electric pump-equipped fishing device, comprising a valve pipe, a sleeve at the bottom of the valve pipe, a centralizer inside the sleeve, a bottom pipe connected to the centralizer, an air gap protector connected to the top of the bottom pipe, a linear motor connected to the top of the air gap protector, a processing component on the linear motor, a bidirectional plunger pump connected to the top of the processing component, and an oil pipe connected to the top of the bidirectional plunger pump, the oil pipe communicating with the valve pipe; the processing component is used to process and separate air bubbles and sand in the oil; the processing component includes a power unit, a fixed processing device, and a gas processing device, the power unit being able to drive the fixed processing device to separate sand and gravel while also separating and compressing gas for self-discharge.

[0008] Preferably, the power unit includes a power shaft with blades mounted on it. The bottom of the bidirectional piston pump is connected to an outer sleeve, and the blades are located inside the outer sleeve. The bottom of the power shaft is connected to a deceleration shaft via a reduction gear. The surface of the deceleration shaft is provided with reciprocating grooves, and the solids processing device is mounted on the deceleration shaft.

[0009] Preferably, the solid processing device includes a sand-proof net, a connecting sleeve connected to the top of the sand-proof net, the connecting sleeve being connected to an outer sleeve, a plurality of sieve holes being provided on the sand-proof net, and a cleaning and squeezing device being provided on the sand-proof net.

[0010] Preferably, the cleaning and squeezing device includes a sliding plate, which is slidably connected to the sandproof mesh, and a sliding pin is provided inside the sliding plate, which is slidably connected to the inside of the reciprocating groove.

[0011] Preferably, the sliding plate includes an outer ring and an inner ring. The outer ring is connected to the inner ring via a connecting key. The outer ring is slidably connected to the outer surface of the sandproof mesh, and the inner ring is slidably connected to the inner wall of the sandproof mesh. The inner ring has fine holes, and an inclined plate is provided inside the fine holes. The inclined plate has guide holes. The inner and outer rings have extrusion grooves. The extrusion grooves match multiple sieve holes on the sandproof mesh, and the extrusion grooves communicate with the fine holes.

[0012] Preferably, the gas processing device includes a triangular plate, which is slidably connected to the surface of the deceleration shaft. The triangular plate is located above the sliding plate. A piston plate is connected to the triangular plate via a connecting rod. An oil inlet and a liquid flow hole are respectively opened at the upper and lower positions of the connecting sleeve. A conical sleeve is provided inside the connecting sleeve, which divides the internal space of the connecting sleeve into a compression chamber and a dividing chamber.

[0013] Preferably, the piston plate is located inside the extrusion chamber, and the liquid flow hole is located below the conical sleeve, with a flow gap provided between the conical sleeve and the connecting sleeve.

[0014] Preferably, the connecting sleeve has a discharge channel inside, a baffle plate is slidably connected inside the discharge channel, a pressure rod is connected to the top of the baffle plate, a compression spring is connected to the top of the pressure rod, and the compression spring is located inside the connecting sleeve.

[0015] Preferably, the piston plate is connected to a rubber sleeve on its surface, the conical sleeve is provided with a cylindrical sliding cavity inside, the piston plate can slide into the cylindrical sliding cavity, and the bottom of the sandproof mesh is connected to a sand collecting sleeve.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a reciprocating submersible electric pump-equipped equipment for oil recovery and disposal, which has the following advantages:

[0018] 1. The equipment for retrieving and fishing with the reciprocating submersible electric pump can effectively separate the ingested oil through the set solid treatment device, and can effectively clean the attached impurities on the sand control screen through the cleaning and extrusion device, ensuring that the surface of the sand control screen is not blocked by the internal impurities of the oil. Moreover, the sliding sheet with a special structure can, while cleaning cyclically up and down, also utilize the effect of extruding the oil. Through the connection of the extrusion groove, it controls the oil to blow back and clean the sieve holes, further ensuring the effective filtering effect of the sand control screen, avoiding the ingestion of sand and improving the operation stability of the equipment.

[0019] 2. The equipment for retrieving and fishing with the reciprocating submersible electric pump can effectively separate the bubbles in the oil through the set gas treatment device, greatly reducing the entry of bubbles into the interior of the pump, preventing the occurrence of gas lock and damage to the pump, and further improving the operation stability and reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0021] Figure 2 It is a schematic diagram of the overall sectional structure of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0022] Figure 3 It is a schematic diagram of the connection position of the processing components of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the processing components of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0024] Figure 5 It is a schematic diagram of the connection structure of the triangular plate and the piston sheet of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the sliding sheet of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0026] Figure 7 It is a schematic diagram of the sectional structure of the screen of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention;

[0027] Figure 8 It is a schematic diagram of the planar structure of the sliding sheet of an equipment for retrieving and fishing with a reciprocating submersible electric pump proposed by the present invention.

[0028] In the diagram: 1. Valve pipe; 2. Sleeve; 3. Bottom pipe; 4. Air gap protector; 5. Linear motor; 6. Processing assembly; 601. Power shaft; 602. Sand guard; 603. Sliding plate; 6031. Inner ring; 6032. Outer ring; 6033. Sliding pin; 6034. Extrusion groove; 6035. Inclined plate; 604. Sand collection sleeve; 605. Reducer; 606. Decelerator shaft; 607. Reciprocating groove; 608. Fine hole; 609. Triangular plate; 610. Piston plate; 611. Conical sleeve; 612. Extrusion chamber; 613. Barrier plate; 614. Pressure rod; 615. Compression spring; 616. Impurity discharge channel; 617. Connecting sleeve; 618. Liquid flow hole; 619. Oil inlet; 620. Dividing chamber; 7. Bidirectional plunger pump; 8. Oil pipe; 9. Blade; 10. Outer sleeve. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1-8 A reciprocating submersible electric pump-equipped fishing device includes a valve pipe 1, a sleeve 2 at the bottom of the valve pipe 1, a centralizer inside the sleeve 2, a bottom pipe 3 connected to the centralizer, an air gap protector 4 connected to the top of the bottom pipe 3, a linear motor 5 connected to the top of the air gap protector 4, a processing component 6 on the linear motor 5, a bidirectional plunger pump 7 connected to the top of the processing component 6, and an oil pipe 8 connected to the top of the bidirectional plunger pump 7, which is connected to the valve pipe 1. The processing component 6 is used to process and separate air bubbles and sand in the oil. The processing component 6 includes a power unit, a fixed processing device, and a gas processing device. The power unit can drive the fixed processing device to separate sand and gravel while also separating and squeezing the gas for self-discharge.

[0031] In this embodiment, the power unit includes a power shaft 601, on which blades 9 are mounted. A jacket 10 is connected to the bottom of the bidirectional plunger pump 7, and the blades 9 are located inside the jacket 10. A retarder shaft 606 is connected to the bottom of the power shaft 601 via a reduction gear 605. A reciprocating groove 607 is provided on the surface of the retarder shaft 606, and a solids processing device is mounted on the retarder shaft 606. When the oil flows from bottom to top, it drives the blades 9 to rotate. The rotation of the blades 9, in turn, drives the retarder shaft 606 to move at a slower speed via the reduction gear 605. The reduction gear 605 contains a planetary reduction gear set. Because the blades 9 rotate at a relatively high speed due to the oil suction, the planetary reduction gear set is used to control the slower rotation of the retarder shaft 606, thereby providing power for subsequent cleaning and impurity removal.

[0032] Furthermore, the solids handling device includes a sand filter 602, with a connecting sleeve 617 connected to the top of the sand filter 602. The connecting sleeve 617 is connected to the outer sleeve 10. The sand filter 602 has multiple sieve holes and a cleaning and squeezing device. The sand filter 602 effectively separates and isolates impurities in the oil, preventing them from entering the equipment and hindering the operation of electronic components and the plunger pump, thus improving the operational stability of the equipment.

[0033] Furthermore, the cleaning and squeezing device includes a sliding plate 603, which is slidably connected to the sand-proof mesh 602. A sliding pin 6033 is provided inside the sliding plate 603, and the sliding pin 6033 is slidably connected inside the reciprocating groove 607. The sliding pin 6033 slides within the bidirectional reciprocating groove 607, causing the sliding plate 603 to slide up and down reciprocally, thereby performing up-and-down reciprocating treatment on the surface of the screen 602, ensuring effective cleaning of the screen, improving separation efficiency, and extending its service life.

[0034] In addition, the sliding plate 603 includes an outer ring 6032 and an inner ring 6031. The outer ring 6032 is connected to the inner ring 6031 by a connecting key. The outer ring 6032 is slidably connected to the outer surface of the sandproof mesh 602. The inner ring 6031 is slidably connected to the inner wall of the sandproof mesh 602. The inner ring 6031 has a fine hole 608. An inclined plate 6035 is provided inside the fine hole 608. A guide hole is provided on the inclined plate 6035. An extrusion groove 6034 is provided in the inner ring 6031 and the outer ring 6032. The extrusion groove 6034 matches with multiple sieve holes on the sandproof mesh 602. The extrusion groove 6034 communicates with the fine hole 608. As the sliding plate 603 slides up and down, the inside of the sand-proof mesh 602 is filled with oil. So, after the oil passes through the fine hole 608, it will pass through the inclined plate 6035, and part of it will enter the squeezing groove 6034. Then, as the sliding plate 603 moves up and down, it will generate squeezing force on the oil inside the squeezing groove 6034, causing the oil to flow back through the screen holes of the screen 602. This back-blowing will clean the impurities attached to the inside of the screen holes, ensuring the cleanliness of the screen and improving the separation effect of the screen 602.

[0035] In addition, the gas processing device includes a triangular plate 609, which is slidably connected to the surface of the deceleration shaft 606. The triangular plate 609 is located above the sliding plate 603. A piston plate 610 is connected to the triangular plate 609 via a connecting rod. An oil inlet 619 and a liquid flow hole 618 are respectively opened at the upper and lower positions of the connecting sleeve 617. A tapered sleeve 611 is provided inside the connecting sleeve 617, which divides the internal space of the connecting sleeve 617 into a compression chamber 612 and a dividing chamber 620. When the sliding plate 603 moves upward, it will come into contact with the triangular plate 609, thereby synchronously driving the triangular plate 609 to move upward, squeezing out the impurities and air bubbles accumulated inside the extrusion chamber 612. As the liquid is squeezed, it is automatically discharged outside the equipment, ensuring the stable operation of the equipment. The cone sleeve 611 can effectively separate impurities and air bubbles in the oil. When the oil flows, it first enters the interior of the cone sleeve 611. After the cone sleeve 611 is full, it will flow into the interior of the dividing chamber 620 from the gap between the bottom of the cone sleeve 611 and the connecting sleeve 617. Therefore, the air bubbles will remain at the high point, that is, in the top space inside the cone sleeve 611, and will not flow out of the gap. The same applies to floating impurities. The vast majority of them will be covered by the cone sleeve 611, achieving the separation of air bubbles and impurities.

[0036] It is worth noting that the piston plate 610 is located inside the extrusion chamber 612, and the liquid flow hole 618 is located below the tapered sleeve 611. A flow gap is provided between the tapered sleeve 611 and the connecting sleeve 617. A discharge channel 616 is provided inside the connecting sleeve 617. A baffle plate 613 is slidably connected inside the discharge channel 616. A pressure rod 614 is connected to the top of the baffle plate 613. A compression spring 615 is connected to the top of the pressure rod 614. The compression spring 615 is located inside the connecting sleeve 617. The triangular plate 609 will drive the piston plate 610 to move upward through the connecting rod and enter the inner cylindrical sliding cavity of the cone sleeve 611. At this time, the oil between the piston plate 610 and the barrier plate 613 will be squeezed upward along with the piston plate 610, thus squeezing and eliminating the air bubbles. At the same time, it can also discharge a small amount of oil with impurities floating at the top position from the position of the impurity discharge channel 616. Therefore, the whole process achieves the effect of defoaming and the effect of self-discharging floating fine impurities.

[0037] It is worth mentioning that the piston plate 610 is connected to a rubber sleeve, and the cone sleeve 611 has a cylindrical sliding cavity inside, allowing the piston plate 610 to slide into the cylindrical sliding cavity. The bottom of the sandproof mesh 602 is connected to a sand collecting sleeve 604. The cylindrical sliding cavity provides sliding space for the piston plate 610, but there is still a small gap between the piston plate 610 and the cylindrical sliding cavity. Otherwise, during automatic impurity removal, the piston plate 610 would be sucked into the cylindrical sliding cavity by negative pressure, preventing it from moving down and resetting under its own weight. The sand collecting sleeve 604 can collect the adhering and flowing impurities on the sandproof mesh 602, and the cleaned impurities will also enter the sand collecting sleeve 604 for collection.

[0038] Working principle: When the submersible electric pump equipment is used for drop-off and retrieval operations, the bidirectional plunger pump 7 pumps the oil in the well in an active manner, draws the oil into the processing component 6, and then pumps it into the valve pipe 1 through the oil pipe 8 for collection.The entire processing component 6 effectively separates solids and gases from the oil. Specifically, when the oil is reciprocated by the bidirectional plunger pump 7, it draws the oil from inside the sleeve 2. The oil then enters through the sand screen 602, passes through the fine holes 608 on the sliding plate 603, and enters the connecting sleeve 617 through the flow holes 618. If air bubbles or tiny impurities are present in the oil, they will be directly blocked and enclosed by the conical sleeve 611. Therefore, fine sand and air bubbles accumulate inside the squeezing chamber 612 of the conical sleeve 611. Once the squeezing chamber 612 is full, the oil enters the dividing chamber 620 from the bottom gap of the conical sleeve 611, and then enters the outer sleeve 10 through multiple interconnected oil inlets 619. The oil is then drawn into the double-acting plunger pump 7 to perform the oil suction operation. As the oil flows from bottom to top, it drives the blades 9 to rotate. The rotation of the blades 9 drives the retarder shaft 606 to move at a slower speed via the reducer 605. The reducer 605 contains a planetary reduction gear set. Because the blades 9 rotate at a relatively high speed due to the oil suction, the planetary reduction gear set controls the slowing rotation of the retarder shaft 606. The rotation of the retarder shaft 606 drives the sliding plate 603 to slide up and down reciprocatingly via the sliding pin 6033 in the double-acting reciprocating groove 607. Therefore, the outer ring 6032 and the inner ring 6031 clean the inner and outer walls of the spun sand screen 602, preventing impurities from adhering to the oil. This causes clogging of the screen holes. When the sliding plate 603 slides up and down, because the inside of the sand screen 602 is filled with oil, the oil, after passing through the fine holes 608, will pass through the inclined plate 6035, and part of it will enter the squeezing groove 6034. Then, with the up and down movement of the sliding plate 603, it will generate squeezing force on the oil inside the squeezing groove 6034, forcing the oil to flow back through the screen holes of the screen 602, thereby backflushing the screen holes and cleaning the impurities attached to the inside of the screen holes, ensuring the cleanliness of the screen and improving the separation effect of the screen 602. Even if some small impurities enter, they will be blocked by the cone sleeve 611 and will not enter the interior of the plunger pump. When the piston moves, it will come into contact with the triangular plate 609, which will then move the triangular plate 609 upward. The triangular plate 609 will then move the piston plate 610 upward through the connecting rod, entering the cylindrical sliding cavity inside the cone sleeve 611. At this time, the oil between the piston plate 610 and the baffle plate 613 will be squeezed upward by the piston plate 610, thus squeezing and eliminating air bubbles. At the same time, it can also discharge a small amount of oil with impurities floating at the top from the position of the impurity discharge channel 616. Therefore, the whole process achieves the effect of defoaming and the effect of self-discharging floating fine impurities, improving the overall stability of the equipment operation, and also preventing sand and gravel from entering the interior of the plunger pump, reducing damage to the plunger pump.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A device for fishing a reciprocating electric submersible pump assembly, characterized in that, The utility model provides a valve pipe (1), the bottom of valve pipe (1) is provided with the sleeve (2), the inside of sleeve (2) is provided with the centralizer, the centralizer is connected with the bottom pipe (3), the top of bottom pipe (3) is connected with the air gap protector (4), the top of air gap protector (4) is connected with the linear motor (5), linear motor (5) is provided with processing assembly (6), the top of processing assembly (6) is connected with the two-way plunger pump (7), the top of two-way plunger pump (7) is provided with the oil pipe (8), the oil pipe (8) is communicated with valve pipe (1); The processing assembly (6) is used for processing and separating gas bubbles and sand in oil; The processing assembly (6) comprises a power device, a fixed treatment device and a gas treatment device, the power device can drive the fixed treatment device to separate sand and also separate and extrude gas.

2. The equipment for fishing the reciprocating electric submersible pump as claimed in claim 1, characterized in that: The power device comprises a power shaft (601), the power shaft (601) is provided with a blade (9), the bottom of the two-way plunger pump (7) is connected with an outer sleeve (10), the blade (9) is located in the outer sleeve (10), the bottom of the power shaft (601) is connected with a retardation shaft (606) through a speed reducer (605), the surface of the retardation shaft (606) is provided with a reciprocating groove (607), and the solid treatment device is arranged on the retardation shaft (606).

3. The equipment for fishing the reciprocating electric submersible pump according to claim 2, characterized in that: The solid treatment device comprises a sand prevention net (602), the top of the sand prevention net (602) is connected with a connecting sleeve (617), the connecting sleeve (617) is connected with the outer sleeve (10), a plurality of screen holes are formed in the sand prevention net (602), and a cleaning and extruding device is arranged on the sand prevention net (602).

4. The equipment for fishing the reciprocating electric submersible pump according to claim 3, characterized in that: The cleaning and extruding device comprises a sliding sheet (603), the sliding sheet (603) is slidably connected to the sand prevention net (602), the inside of the sliding sheet (603) is provided with a sliding pin (6033), and the sliding pin (6033) is slidably connected to the inside of the reciprocating groove (607).

5. The equipment for fishing the reciprocating electric submersible pump according to claim 5, characterized in that: The sliding sheet (603) comprises an outer ring (6032) and an inner ring (6031), the outer ring (6032) is connected with the inner ring (6031) through a connecting key, the outer ring (6032) is slidably connected to the outer surface of the sand prevention net (602), the inner ring (6031) is slidably connected to the inner wall of the sand prevention net (602), a fine hole (608) is formed in the inner ring (6031), an inclined sheet (6035) is arranged in the inside of the fine hole (608), a guide hole is formed in the inclined sheet (6035), an extruding groove (6034) is formed in the inner ring (6031) and the outer ring (6032), the extruding groove (6034) is matched with the plurality of screen holes in the sand prevention net (602), and the extruding groove (6034) is communicated with the fine hole (608).

6. A device for fishing a reciprocating electric submersible pump assembly according to claim 5, characterized in that: The gas treatment device comprises a triangular plate (609) which is slidingly connected to the surface of the brake shaft (606), the triangular plate (609) is located above the sliding sheet (603), a piston sheet (610) is connected to the triangular plate (609) through a connecting rod, an oil inlet (619) and a liquid flow hole (618) are arranged on the upper and lower positions of the connecting sleeve (617) respectively, a taper sleeve (611) is arranged in the connecting sleeve (617), and the taper sleeve (611) divides the internal space of the connecting sleeve (617) into an extrusion cavity (612) and a division cavity (620).

7. The equipment for fishing the reciprocating electric submersible pump according to claim 6, characterized in that: The piston sheet (610) is located in the extrusion cavity (612), and the liquid flow hole (618) is located below the taper sleeve (611), and a flow gap is arranged between the taper sleeve (611) and the connecting sleeve (617).

8. The equipment for fishing the reciprocating electric submersible pump according to claim 6, characterized in that: A impurity removal flow channel (616) is arranged in the connecting sleeve (617), a blocking sheet (613) is slidingly connected in the impurity removal flow channel (616), a pressing rod (614) is connected to the top of the blocking sheet (613), a compression spring (615) is connected to the top of the pressing rod (614), and the compression spring (615) is located in the connecting sleeve (617).

9. The apparatus for fishing a reciprocating electric submersible pump assembly according to claim 8, wherein: A rubber sleeve is connected to the surface of the piston sheet (610), a cylindrical sliding cavity is arranged in the taper sleeve (611), the piston sheet (610) can slide into the cylindrical sliding cavity, and a sand collecting sleeve (604) is connected to the bottom of the sand prevention net (602).

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