Sand prevention type electric submersible screw pump

Abstract

The utility model provides a sand prevention type electric submersible screw pump, and belongs to the technical field of electric submersible screw pumps. The sand prevention type electric submersible screw pump comprises a screw pump body, the screw pump body is fixedly sleeved with an installation disc, a liquid inlet is formed in the screw pump body, the installation disc is detachably connected with a sleeve assembly, and the screw pump body is sleeved with the sleeve assembly. The detachable sleeve assembly is arranged on the screw pump body in a sleeving mode, the multiple sand grain filtering plates are installed in the sleeve assembly, and the liquid inlets in the screw pump body are located between every two adjacent sand grain filtering plates, so that when the screw pump body works, well liquid enters the sleeve assembly, sand grains are filtered in the sleeve assembly through the sand grain filtering plates, and the sand grains are filtered out through the sand grain filtering plates; and after the screw pump body is drawn out of a drilling well, the sleeve assembly can be taken down from the screw pump, so that the purposes of taking the sand out of the drilling well and preventing the sand from damaging a stator and a rotor of the screw pump are achieved.

Description

Technical Field

[0001] The present application relates to the field of electric submersible screw pumps, and in particular, to a sand-proof electric submersible screw pump. Background Art

[0002] The electric submersible screw pump oil production system uses a downhole submersible motor to directly drive a screw pump to lift liquid. It combines the advantages of a rodless oil production system, downhole motor drive, and a screw pump. Compared with a rod pump, it can save energy by 30% to 60%, and can exceed the pumping depth of a rod pump. It can be used in heavy oil wells, sand wells, gas wells, inclined wells, and horizontal wells.

[0003] The utility model patent with authorization announcement number CN219327624U discloses a sand and gas proof electric submersible screw pump device, including a submersible motor and a screw pump. The lower end of the screw pump is connected to the submersible motor. The screw pump has a liquid inlet and also includes an annular screen pipe, which is mounted on the outer periphery of the screw pump and located on the upper side of the liquid inlet. This solves the technical problem in the prior art that sand and gas enter the screw pump with the well fluid, causing damage to the screw pump and reduced oil well operation efficiency.

[0004] In the above scheme, by installing an annular screen on the screw pump, the sand in the well fluid can be filtered to prevent the sand from entering the screw pump. However, the annular screen can only filter the sand in the well fluid, and the filtered sand will remain in the wellbore, which will cause the well fluid to be extracted not cleanly enough and affect the use of drilling. For this reason, we propose a sand-proof submersible screw pump. Utility Model Content

[0005] In order to make up for the above shortcomings, the present application provides a sand-proof electric submersible screw pump, which aims to improve the problem that sand particles will remain in the well in the above solution.

[0006] An embodiment of the present application provides a sand-proof submersible screw pump, comprising a screw pump body, a mounting plate fixedly sleeved on the screw pump body, and a liquid inlet opened on the mounting plate, a sleeve assembly detachably connected to the mounting plate, the sleeve assembly being sleeved on the screw pump body, and a plurality of sand filter plates which are arranged in contact with the outer wall of the screw pump body are installed on the inner wall thereof, and the liquid inlet is located between two adjacent sand filter plates.

[0007] In a specific embodiment, the sleeve assembly includes a connecting plate connected to the mounting plate, a sleeve is installed on the top of the connecting plate, the sleeve is sleeved on the screw pump body, and a through opening is opened on its side wall, and a plurality of sand filter plates are fixedly installed on the inner wall of the sleeve.

[0008] In a specific embodiment, the through-port and the liquid inlet are staggered so that sand and gravel enter through the through-port and are filtered in the sleeve.

[0009] In a specific embodiment, two of the liquid inlet and the through-port are provided, and the two through-ports are provided near the top of the sleeve.

[0010] In a specific embodiment, a plurality of first connecting holes and second connecting holes are respectively formed on the mounting plate and the connecting plate, and a same locking member passes through the first connecting hole and the second connecting hole.

[0011] In a specific embodiment, the locking member includes a screw rod passing through the first connecting hole and the second connecting hole, and a nut is threadedly connected to one end of the screw rod to lock the connecting plate on the mounting plate.

[0012] In a specific embodiment, a first sealing gasket and a second sealing gasket are sleeved on the screw rod, and the first sealing gasket and the second sealing gasket are respectively arranged in contact with the mounting disk and the connecting disk.

[0013] In a specific embodiment, a same sealing ring is placed between the mounting plate and the connecting plate, and a plurality of the screw rods are all arranged through the sealing ring.

[0014] The beneficial effects of the present application are as follows: a detachable sleeve assembly is sleeved on the screw pump body, a plurality of sand filter plates are installed in the sleeve assembly, and the liquid inlet on the screw pump body is located between two adjacent sand filter plates, so that when the screw pump body is working, the well fluid enters the sleeve assembly, and the sand is filtered in the sleeve assembly through the sand filter plates, thereby achieving the purpose of collecting the sand in the sleeve assembly; after the screw pump body is pulled out of the well, the sleeve assembly can be removed from the screw pump to achieve the purpose of removing the sand from the well, while preventing the sand from damaging the stator and rotor of the screw pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the main structure of the sand-proof electric submersible screw pump provided in the embodiment of the present application;

[0017] Figure 2 A schematic diagram of a cross-sectional structure of a sleeve in a sand-proof electric submersible screw pump provided in an embodiment of the present application;

[0018] Figure 3A front cross-sectional structural schematic diagram of a sand-proof electric submersible screw pump provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of a top view and cross-section structure of a sand-proof electric submersible screw pump provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of the disassembled structure of the sleeve in the sand-proof electric submersible screw pump provided in the embodiment of the present application. In the figure: 10-screw pump body; 20-mounting plate; 30-liquid inlet; 40-sleeve assembly; 410-connecting plate; 420-sleeve; 430-through hole; 50-sand filter plate; 60-first connecting hole; 70-second connecting hole; 80-locking member; 810-screw; 820-nut; 830-first sealing gasket; 840-second sealing gasket; 90-sealing ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0022] See also Figure 1-5 The present application provides a sand-proof submersible screw pump, including a screw pump body 10, on which a mounting plate 20 is fixedly sleeved, and a liquid inlet 30 is opened, and a sleeve assembly 40 is detachably connected to the mounting plate 20, which is sleeved on the screw pump body 10, and a plurality of sand filter plates 50 are installed on the inner wall of the sleeve assembly 40, which are all arranged in contact with the outer wall of the screw pump body 10, and the liquid inlet 30 is located between two adjacent sand filter plates 50. Specifically, the liquid inlet 30 is arranged near the bottom of the sleeve assembly 40, so that after the well fluid enters the sleeve assembly 40, the sand in the well fluid is filtered through the sand filter plate 50, and the filtered well fluid enters the screw pump body 10 through the liquid inlet 30 to be lifted upward, and the sand remains in the sleeve assembly 40.

[0023] See also Figure 3 The sleeve assembly 40 includes a connecting plate 410 connected to the mounting plate 20, a sleeve 420 is installed on the top of the connecting plate 410, the sleeve 420 is sleeved on the screw pump body 10, and a through hole 430 is opened on its side wall, and a plurality of sand filter plates 50 are fixedly installed on the inner wall of the sleeve 420. When set, the well fluid enters the sleeve 420 through the through hole 430, and moves downward in the sleeve 420 through the well fluid to enter the interior of the screw pump body 10 through the liquid inlet 30, and the sand filter plate 50 in the sleeve 420 filters the sand in the sleeve 420, so as to facilitate the removal of sand in the well.

[0024] See also Figure 3 and 4The through-port 430 is staggered with the liquid inlet 30, so that sand and gravel enter through the through-port 430 and are filtered in the sleeve 420. There are two liquid inlet 30 and two through-ports 430, and the two through-ports 430 are both arranged near the top of the sleeve 420. It should be noted that the through-port 430 is staggered with the liquid inlet 30, that is, the through-port 430 is separated from the liquid inlet 30 by the sand filter plate 50, so that the well fluid entering the sleeve 420 through the through-port 430 will pass through the sand filter plate 50, thereby achieving the purpose of filtering sand.

[0025] See also Figure 5 A plurality of first connecting holes 60 and second connecting holes 70 are respectively provided on the mounting plate 20 and the connecting plate 410. The first connecting holes 60 and the second connecting holes 70 are penetrated by the same locking member 80. In the specific setting, the connecting plate 410 is locked on the mounting plate 20 by the locking member 80. At the same time, the inner wall of the connecting plate 410 is flush with the inner wall of the sleeve 420. Therefore, when the locking member 80 is removed, the sleeve 420 is pulled upward to separate the bottom of the connecting plate 410 from the mounting plate 20, so that the sand particles can be exposed from the bottom of the connecting plate 410 to discharge the sand particles. Therefore, the sand particles can be discharged from the sleeve 420 without completely disassembling the sleeve 420. When maintaining the sleeve 420, the screw pump body 10 is disassembled from the mechanical equipment, and then the sleeves 420 at both ends are pulled upward to remove the sleeve 420 from the top of the screw pump body 10.

[0026] See also Figure 5 The locking member 80 includes a screw rod 810 passing through the first connecting hole 60 and the second connecting hole 70, and one end of the screw rod 810 is threadedly connected to a nut 820 to lock the connecting plate 410 on the mounting plate 20. Specifically, the nut 820 is locked with the screw rod 810, so that the mounting plate 20 and the connecting plate 410 can be clamped and locked from both sides. At the same time, the nut 820 can prevent well fluid from entering the nut 820 to avoid corrosion of the internal threaded structure.

[0027] See also Figure 5 A first sealing gasket 830 and a second sealing gasket 840 are sleeved on the screw 810, and the first sealing gasket 830 and the second sealing gasket 840 are respectively arranged in contact with the mounting disk 20 and the connecting disk 410. When arranged, the first sealing gasket 830 is attached to the bottom of the mounting disk 20, and the second sealing gasket 840 is attached to the top of the connecting disk 410, so that the head of the screw 810 is pressed on the first sealing gasket 830, and the nut 820 is pressed on the second sealing gasket 840, thereby blocking the first connecting hole 60 and the second connecting hole 70 to prevent the well fluid from corroding the threaded structure of the screw 810.

[0028] See also Figure 5A same sealing ring 90 is placed between the mounting disk 20 and the connecting disk 410, and a plurality of screw rods 810 are arranged through the sealing ring 90. It should be noted that the mounting disk 20 and the connecting disk 410 sandwich the sealing ring 90 in the middle to improve the sealing between the mounting disk 20 and the connecting disk 410. At the same time, a plurality of holes are opened on the sealing ring 90 so that the screw rods 810 are arranged through the holes.

[0029] When the sand-proof electric submersible screw pump is in use: the screw pump body 10 is placed in the well through existing equipment. When the screw pump body 10 is working, the well fluid in the well is absorbed into the sleeve 420 through the through-hole 430. After the well fluid is filtered by the sand filter plate 50 in the sleeve 420, it enters the screw pump body 10 through the liquid inlet 30, is lifted upward by the screw pump body 10, and the sand is filtered in the sleeve 420 to achieve the purpose of collecting the sand, thereby facilitating the removal of the sand from the well and preventing the sand from damaging the screw pump body 10.

[0030] It should be noted that the specific model and specifications of the screw pump body 10 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be described in detail.

[0031] The power supply and principle of the screw pump body 10 are clear to those skilled in the art and will not be described in detail here.

[0032] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A sand-proof electric submersible screw pump, characterized in that: The invention comprises a screw pump body (10), a mounting plate (20) being fixedly sleeved on the screw pump body (10) and having a liquid inlet (30) formed thereon, a sleeve assembly (40) being detachably connected to the mounting plate (20), the sleeve assembly (40) being sleeved on the screw pump body (10), and having a plurality of sand filter plates (50) being mounted on the inner wall thereof and being in contact with the outer wall of the screw pump body (10), the liquid inlet (30) being located between two adjacent sand filter plates (50).

2. The sand-proof electric submersible screw pump according to claim 1, characterized in that: The sleeve assembly (40) includes a connecting plate (410) connected to the mounting plate (20), a sleeve (420) being installed and connected to the top of the connecting plate (410), the sleeve (420) being sleeved on the screw pump body (10), and a through hole (430) being opened on the side wall thereof, and a plurality of sand filter plates (50) being fixedly installed on the inner wall of the sleeve (420).

3. The sand-proof electric submersible screw pump according to claim 2, characterized in that: The through-port (430) and the liquid inlet (30) are staggered so that sand and gravel enter through the through-port (430) and are filtered in the sleeve (420).

4. The sand-proof electric submersible screw pump according to claim 3, characterized in that: The liquid inlet (30) and the through-hole (430) are both provided with two, and the two through-holes (430) are both provided near the top of the sleeve (420).

5. The sand-proof electric submersible screw pump according to claim 2, characterized in that: The installation plate (20) and the connection plate (410) are respectively provided with a plurality of first connection holes (60) and second connection holes (70), and the same locking member (80) passes through the first connection hole (60) and the second connection hole (70).

6. The sand-proof electric submersible screw pump according to claim 5, characterized in that: The locking member (80) comprises a screw rod (810) passing through the first connecting hole (60) and the second connecting hole (70), and a nut (820) is threadedly connected to one end of the screw rod (810) to lock the connecting plate (410) onto the mounting plate (20).

7. The sand-proof electric submersible screw pump according to claim 6, characterized in that: A first sealing gasket (830) and a second sealing gasket (840) are sleeved on the screw rod (810), and the first sealing gasket (830) and the second sealing gasket (840) are respectively arranged in contact with the mounting plate (20) and the connecting plate (410).

8. The sand-proof electric submersible screw pump according to claim 6, characterized in that: A common sealing ring (90) is placed between the installation plate (20) and the connection plate (410), and a plurality of screw rods (810) are arranged to pass through the sealing ring (90).

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