Screw pump exhaust device

Abstract

The utility model provides an exhaust device of a screw pump, which relates to the technical field of screw pumps, aims to solve the problem of low oil outlet efficiency caused by high gas content when the screw pump works in an oil-gas well in the prior art, and comprises a motor, a transmission mechanism, an oil-gas separation pipe and a screw mechanism, the output end of the motor is connected with the conveying mechanism, the other end of the conveying mechanism is connected with the screw mechanism, a pump inlet is formed in the side wall of the end, close to the motor, of the conveying mechanism, the oil-gas separation pipe is connected to the outer side of the conveying mechanism in a sleeving mode and extends from the end close to the motor to the end away from the motor, and the pump inlet is located in the inner side of the oil-gas separation pipe. According to the exhaust device of the screw pump, oil and gas can be separated, so that all oil entering the pump is crude oil, no natural gas exists, the working efficiency is ensured, and the service life of the pump is prevented from being shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw pump technical field especially is involved in a screw rod pump exhaust device. BACKGROUND

[0002] Screw pump is a kind of pump that water body is spirally raised along the axial by the rotation of screw blade.Screw rod pump is widely applied in multiple fields.It is mainly applied to petroleum chemical industry, environmental protection water treatment, chemical production and other fields, wherein, screw rod pump is mainly used for conveying various corrosive liquids and high temperature and high pressure medium in petroleum chemical industry.

[0003] General ordinary screw pump works in oil well with sufficient oil, and there is no any problem.When the crude oil is unstable, along with a large amount of natural gas and oil together, when using general ordinary screw pump, natural gas will be pumped out together with oil from the pump inlet.The influence of oil production efficiency, when the proportion of natural gas is too high, the stator and rotor of screw pump will dry run, cause temperature to rise, pump wears too fast, and service life is reduced. SUMMARY

[0004] The utility model discloses a kind of screw rod pump exhaust devices, to solve the problem that screw pump in prior art works in oil and gas well due to high gas content causes low oil production efficiency, the screw rod pump exhaust device of the utility model can separate oil and gas, make all into crude oil, without natural gas, ensure working efficiency, also avoid reducing the working life of pump.

[0005] The utility model provides a kind of screw rod pump exhaust device, including motor, conveying mechanism, oil-gas separation pipe and screw rod mechanism, the output end of the motor is connected with the conveying mechanism, another end of the conveying mechanism is connected with the screw rod mechanism, on the side wall of one end of the conveying mechanism close to the motor is provided with pump inlet, the oil-gas separation pipe is sleeved on the outside of the conveying mechanism and is extended by the end close to the motor to the end away from motor, the pump inlet is located in the inside of the oil-gas separation pipe, separation passage is formed between the oil-gas separation pipe and the conveying mechanism, one end of the oil-gas separation pipe is closed connection with motor, the other end of the oil-gas separation pipe has the oil inlet that communicates with the separation passage.

[0006] As a preferred scheme of the utility model, a plurality of connecting pieces are provided on the oil-gas separation pipe close to the motor, a plurality of the connecting pieces are distributed on the outer periphery of the oil-gas separation pipe, the connecting piece is perpendicular to the axis of the oil-gas separation pipe, the connecting piece is connected with the end face of the motor by connecting piece.

[0007] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0008] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0009] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0010] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0011] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0012] As one preferred scheme of the utility model, the oil-gas separation pipe is provided with an avoiding gap near one end of the motor, the motor is provided with a cable plug on the end face, and the avoiding gap is correspondingly arranged with the cable plug.

[0013] Compared with the prior art, the utility model has the following positive effects:

[0014] The screw pump exhaust device provided by the utility model, including motor, conveying mechanism, oil-gas separation pipe and screw mechanism, the output end of motor is connected with conveying mechanism, the other end of conveying mechanism is connected with screw mechanism, the side wall of one end of conveying mechanism near motor is provided with pump inlet, the oil-gas separation pipe is sleeved on the outside of conveying mechanism and is extended and arranged from the end near motor to the end far from motor, the pump inlet is located in the inside of oil-gas separation pipe, the separation channel is formed between oil-gas separation pipe and conveying mechanism, one end of oil-gas separation pipe is closedly connected with motor, the other end of oil-gas separation pipe has the oil inlet communicating with separation channel. When the utility model's screw pump exhaust device is applied in oil-gas well, motor is arranged at the bottom of well, conveying mechanism and screw mechanism are sequentially arranged on the upside of motor. When motor is opened, oil and gas reach the height of pump inlet together, water and gas are temporarily prevented from entering pump through oil-gas separation pipe, oil moves upwards along separation oil-gas separation pipe, enters the separation channel in the inside of oil-gas separation pipe from the upper edge of oil-gas separation pipe, then moves downwards along the inner wall of oil-gas separation pipe and enters pump from pump inlet, at this time, when natural gas moves to the upper edge of oil-gas separation pipe, it will continue to move upwards due to buoyancy and will not enter oil-gas separation pipe together with oil. Thus, oil and gas are separated, all the oil entering pump is crude oil without natural gas, the working efficiency is ensured, and the working life of pump is avoided from being reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without paying creative labor.

[0016] Figure 1 It is the external structure schematic view of the screw pump exhaust device of the utility model;

[0017] Figure 2 It is the structure schematic view of the oil-gas separation pipe and sand prevention device in the utility model;

[0018] Figure 3 It is the internal structure schematic view of the screw pump exhaust device of the utility model;

[0019] Figure 4 It is Figure 3 It is the local enlarged view of A in the utility model;

[0020] In the figure: 1, motor; 2, conveying mechanism; 21, long tube; 22, connecting shaft; 23, pump inlet; 3, screw mechanism; 31, stator; 32, rotor; 4, oil-gas separation tube; 41, connecting piece; 42, connecting piece; 43, avoiding gap; 44, separation channel; 45, oil inlet; 5, sand prevention device; 51, sand prevention sleeve; 511, reinforcing ring; 512, sleeve part; 513, expanded part; 514, crack; 52, oil inlet gap; 53, locking piece; 54, separation pad; 6, cable plug. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be explained that, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplification, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0024] Example 1:

[0025] The screw pump exhaust device provided in this embodiment, as shown in Figures 1-4 The output end of the motor 1 is connected with the conveying mechanism 2, and the other end of the conveying mechanism 2 is connected with the screw mechanism 3. The motor 1 drives the screw mechanism 3 to operate through the conveying mechanism 2.

[0026] The pump inlet 23 is arranged on the side wall of the conveying mechanism 2 close to one end of the motor 1, the oil-gas separation tube 4 is sleeved on the outside of the conveying mechanism 2 and extends from the end close to the motor 1 to the end away from the motor 1, and the pump inlet 23 is located inside the oil-gas separation tube 4.

[0027] A separation channel 44 is formed between the oil-gas separation pipe 4 and the transmission mechanism 2, one end of the oil-gas separation pipe 4 is closedly connected with the motor 1, and the other end of the oil-gas separation pipe 4 has an oil inlet 45 communicating with the separation channel 44. The oil can enter the separation channel 44 from the oil-gas separation pipe 4 away from the motor 1, and then enter the pump from the pump inlet 23.

[0028] The oil-gas separation pipe 4 is made of a D60x0.9 stainless steel round pipe which can be purchased in the market, and is processed by laser cutting and bending shaping. The processing is simple, the cost is not high, and the assembly operation is simple and convenient.

[0029] When the screw pump exhaust device of the embodiment is applied in an oil and gas well, as shown in Figure 3 , the motor 1 is arranged at the bottom of the well, and the transmission mechanism 2 and the screw mechanism 3 are arranged in sequence on the upper side of the motor 1. When the motor 1 is started, the oil and gas reach the height of the pump inlet, and the water and gas are temporarily prevented from entering the pump by the oil-gas separation pipe 4. The oil moves upward along the oil-gas separation pipe 4, enters the separation channel 44 inside the oil-gas separation pipe 4 from the upper edge of the oil-gas separation pipe 4, and then moves downward along the inner wall of the oil-gas separation pipe 4 to enter the pump from the pump inlet 23. At this time, when the natural gas moves to the upper edge of the oil-gas separation pipe 4, it will continue to move upward due to the buoyancy and will not enter the oil-gas separation pipe 4 together with the oil. Thus, the oil and gas are separated, and all the oil entering the pump is crude oil without natural gas, which ensures the working efficiency and avoids reducing the working life of the pump.

[0030] The screw pump exhaust device of the embodiment can be applied in a situation where a large amount of bubbles are accompanied by water sources, such as a well where crude oil and natural gas coexist in an oil and gas well.

[0031] As a preferred embodiment, as shown in Figure 1 and Figure 2 , a plurality of connecting pieces 41 are arranged on the oil-gas separation pipe 4 close to one end of the motor 1. The plurality of connecting pieces 41 are distributed on the outer periphery of the oil-gas separation pipe 4, the connecting pieces 41 are perpendicular to the axis of the oil-gas separation pipe 4, and the connecting pieces 41 are connected with the end face of the motor 1 through connecting pieces 42. The connecting pieces 41 can be provided with four, and the four connecting pieces 41 are evenly distributed around the oil-gas separation pipe 4 and connected to the end face of the motor 1 through the connecting holes in the connecting pieces 41 by bolts.

[0032] As a preferred embodiment, an avoiding notch 43 is arranged on the oil-gas separation pipe 4 close to one end of the motor 1, and a cable plug 6 is arranged on the end face of the motor 1. The avoiding notch 43 is arranged corresponding to the cable plug 6 to avoid the influence of the oil-gas separation pipe 4 on the cable plug 6.

[0033] As a preferred embodiment, the sand prevention device 5 is arranged at the oil inlet 45 of the oil-gas separation pipe 4, and the sand prevention device 5 is arranged around the conveying mechanism 2. The bottom end of the sand prevention device 5 has an outer diameter greater than that of the oil-gas separation pipe 4. A plurality of separation pads 54 are arranged between the sand prevention device 5 and the side wall of the oil-gas separation pipe 4, so that the oil inlet gap 52 is formed between the sand prevention device 5 and the side wall of the oil-gas separation pipe 4. The crude oil can enter the separation channel 44 through the oil inlet gap 52 and the oil inlet 45.

[0034] In the embodiment, the sand prevention device 5 is arranged on the oil-gas separation pipe 4. The bottom end of the sand prevention device 5 has an outer diameter greater than that of the oil-gas separation pipe 4, so that the oil inlet 45 of the oil-gas separation pipe 4 is shielded. The sand outside the pump falls together with the oil and is blocked by the sand prevention device 5, so that the sand cannot enter the separation channel 44 from above the oil-gas separation pipe 4.

[0035] As a preferred embodiment, the sand prevention device 5 includes a sand prevention sleeve 51 and a locking member 53. One side of the sand prevention sleeve 51 is provided with a crack 514, so that the sand prevention sleeve 51 is arranged on the conveying mechanism 2. The locking member 53 is connected to the outer side of the sand prevention sleeve 51 and fastens the sand prevention sleeve 51 to the conveying mechanism 2. The locking member 53 can be a bolt. The sand prevention sleeve 51 can be made of fluorine rubber.

[0036] As a preferred embodiment, as shown in Figure 2 and Figure 4 , the sand prevention sleeve 51 includes a reinforcing ring 511, a sleeve part 512, and an outwardly expanding part 513. The reinforcing ring 511 and the outwardly expanding part 513 are respectively connected to the two ends of the sleeve part 512. The reinforcing ring 511 is used to support the upper part of the sand prevention sleeve 51, so that the sand prevention sleeve 51 has a certain supporting strength.

[0037] The sleeve part 512 is arranged in abutment with the outer side of the conveying mechanism 2. The outwardly expanding part 513 extends from the side close to the conveying mechanism 2 to the side away from the conveying mechanism 2 from top to bottom. The outer diameter of the end of the outwardly expanding part 513 away from the sleeve part 512 is greater than that of the end of the outwardly expanding part 513 close to the sleeve part 512 and greater than that of the oil-gas separation pipe 4. The bottom end of the outwardly expanding part 513 is in abutment with the separation pad 54. The outwardly expanding part 513 is used to shield the oil inlet 45 of the oil-gas separation pipe 4. The separation pad 54 can be connected to the bottom end of the outwardly expanding part 513. The separation pad 54 is used to support the sand prevention sleeve 51.

[0038] As a preferred embodiment, the conveying mechanism 2 includes a connecting shaft 22 and a long pipe 21. The long pipe 21 is arranged on the outer side of the connecting shaft 22. The screw mechanism 3 includes a stator 31 and a rotor 32. The rotor 32 is arranged in the stator 31. One end of the connecting shaft 22 is connected to the output shaft of the motor 1, and the other end is connected to the rotor 32. The stator 31 is connected to the long pipe 21. The oil-gas separation pipe 4 and the sand prevention device 5 are arranged on the outer side of the long pipe 21.

[0039] The screw pump exhaust device of the embodiment is used for pumping oil well liquid, as shown in the figure, the motor 1 is arranged at the bottom of the well, and the transmission mechanism 2 and the screw mechanism 3 are sequentially arranged on the upper side of the motor 1. After the motor is started, the motor shaft rotates, drives the connecting shaft 22 and the rotor 32 to rotate, and the crude oil in the separation channel 44 enters the pump from the pump inlet 23 and rises in the long pipe 21 to the stator 31. Figure 3

[0040] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make several modifications and improvements without departing from the creative concept of the present application, which should be covered in the protection scope of the present application.​

Claims

1. A screw pump exhaust device characterized by, The utility model relates to a pump, which comprises a motor (1), a conveying mechanism (2), an oil-gas separation tube (4) and a screw mechanism (3), the output end of the motor (1) is connected with the conveying mechanism (2), the other end of the conveying mechanism (2) is connected with the screw mechanism (3), a pump inlet is arranged on the side wall of the conveying mechanism (2) near one end of the motor (1), the oil-gas separation tube (4) is sleeved on the outside of the conveying mechanism (2) and extends from the end near the motor (1) to the end away from the motor (1), the pump inlet is located inside the oil-gas separation tube (4), a separation channel (44) is formed between the oil-gas separation tube (4) and the conveying mechanism (2), one end of the oil-gas separation tube (4) is closed and connected with the motor (1), and the other end of the oil-gas separation tube (4) is provided with an oil inlet (45) in communication with the separation channel (44).

2. A screw pump venting device according to claim 1, wherein A plurality of connecting pieces (41) are arranged on the oil-gas separation tube (4) near the motor (1), the connecting pieces (41) are distributed on the outer periphery of the oil-gas separation tube (4), the connecting pieces (41) are perpendicular to the axis of the oil-gas separation tube (4), and the connecting pieces (41) are connected with the end face of the motor (1) through connecting pieces (42).

3. A screw pump venting device according to claim 1, wherein An avoiding gap (43) is arranged on the oil-gas separation tube (4) near the motor (1), the end face of the motor (1) is provided with a cable plug, and the avoiding gap (43) is arranged correspondingly with the cable plug.

4. A screw pump venting device according to claim 1, wherein A sand prevention device (5) is arranged at the oil inlet (45) of the oil-gas separation tube (4), the sand prevention device (5) is arranged around the conveying mechanism (2), the outer diameter of the bottom end of the sand prevention device (5) is greater than the outer diameter of the oil-gas separation tube (4), a plurality of separation pads (54) are arranged between the sand prevention device (5) and the side wall of the oil-gas separation tube (4), and an oil inlet gap (52) is formed between the sand prevention device (5) and the side wall of the oil-gas separation tube (4).

5. A screw pump venting device according to claim 4, wherein, The sand prevention device (5) comprises a sand prevention sleeve (51) and a locking piece (53), one side of the sand prevention sleeve (51) is provided with a crack, and the locking piece (53) is connected to the outside of the sand prevention sleeve (51) and fastens the sand prevention sleeve (51) to the conveying mechanism (2).

6. A screw pump venting device according to claim 5, wherein, The sand prevention sleeve (51) comprises a reinforcing ring (511), a sleeve part (512) and an outward expansion part (513), the reinforcing ring (511) and the outward expansion part (513) are connected to the two ends of the sleeve part (512) respectively, the sleeve part (512) is arranged close to the outside of the conveying mechanism (2), the outward expansion part (513) extends from the side close to the conveying mechanism (2) to the side away from the conveying mechanism (2) from top to bottom, the outer diameter of the end of the outward expansion part (513) away from the sleeve part (512) is greater than the outer diameter of the end of the outward expansion part (513) close to the sleeve part (512) and greater than the outer diameter of the oil-gas separation tube (4), and the bottom end of the outward expansion part (513) abuts against the separation pad (54).

7. A screw pump exhaust device according to claim 1, wherein The conveying mechanism (2) comprises a connecting shaft (22) and a long tube (21), the long tube (21) is arranged outside the connecting shaft (22), the screw mechanism (3) comprises a stator (31) and a rotor (32), the rotor (32) is arranged in the stator (31), one end of the connecting shaft (22) is connected with the output shaft of the motor (1) and the other end is connected with the rotor (32), and the stator (31) is connected with the long tube (21).

8. A screw pump venting device according to claim 1, wherein The oil-gas separation tube (4) is a stainless steel round tube.

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