Sand filtering device of underground oil well pump

Abstract

The utility model relates to the technical field of oil extraction devices, and discloses an underground oil well pump sand filtering device which comprises a tail pipe arranged at the lower end of a pump cylinder, the bottom of the tail pipe is communicated with a filtering cover, filtering holes are formed in the filtering cover, a mud scraping assembly corresponding to the filtering holes is arranged on the filtering cover, and the mud scraping assembly is connected with the tail pipe. The filter cover is further provided with a swing part matched with the mud scraping assembly, a rotor blade is rotationally arranged at an inlet of the tail pipe, and the rotor blade is connected with the swing part. According to the utility model, the rotor blade of which the single-side fan blade is opposite to the inlet of the tail pipe is arranged in the tail pipe, so that crude oil can push the rotor blade to rotate in the process that the crude oil enters the tail pipe, and the rotor blade rotates to enable the swing rod to rotate and drive the rollers and the cleaning brushes on the two sides to move so as to scrape and clean the side wall of the filter cover; the cleaning brush can continue to return to the original position under the action of the elastic piece, so that the side wall of the filter cover is continuously scraped and cleaned, and the oil pumping efficiency of the oil well pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production devices, in particular to a downhole oil pump sand filter device. Background Art

[0002] Oil sands are often encountered during the oil field pumping process, which can block the oil flow channel and cause the pump to get stuck, resulting in damage to the oil pump. In order to effectively filter out the oil sands and prevent them from entering the pump, a protective net is usually installed at the bottom of the tail pipe to filter out the sand particles carried by the crude oil.

[0003] However, when the oil well pump works for a long time, some sand particles will adhere to the outer wall of the protective net, affecting the oil pumping efficiency of the oil well pump. In order to solve the above problem, we propose a downhole oil well pump sand filtering device. Utility Model Content

[0004] The utility model aims to provide a downhole oil pump sand filter device to solve the problem that when the oil pump works for a long time, some sand particles will adhere to the outer wall of the protective net, thereby affecting the oil pumping efficiency of the oil pump.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a downhole oil pump sand filtering device, comprising a tail pipe arranged at the lower end of the oil pump barrel, the bottom of the tail pipe is connected to a filter cover, the filter cover is provided with filter holes, the filter cover is provided with a mud scraper assembly for cleaning the outside of the filter holes, the filter cover is also provided with a swinging member for driving the mud scraper assembly, and rotor blades are rotatably provided at the inlet of the tail pipe, and the rotor blades are connected to the swinging member.

[0006] According to the above technical solution, the tail pipe is connected to the filter cover via a pressure regulating tube, and the cross-sectional radius of the pressure regulating tube is smaller than the cross-sectional radius of the tail pipe.

[0007] According to the above technical solution, the center of the rotor blade is directly opposite to the edge of the pressure regulating tube.

[0008] According to the above technical solution, the scraper assembly includes a guide rod fixedly connected to the side wall of the filter cover, the outer wall of the guide rod is slidably sleeved with a cleaning brush that slides and abuts against the side wall of the filter cover, and the guide rod is provided with an elastic member connected to the cleaning brush.

[0009] According to the above technical solution, a roller is rotatably provided on the side wall of the cleaning brush, and the swinging member includes a swing rod rotatably connected to the filter cover, and the swing rod is adapted to the roller.

[0010] According to the above technical solution, a rotating rod is fixedly connected to the center of the side wall of the rotor blade, the rotating rod passes through the tail pipe and is connected to a transmission assembly, and the transmission assembly is connected to the swing member.

[0011] According to the above technical solution, the transmission assembly is connected by multiple gear transmissions.

[0012] According to the above technical solution, the blades of the rotor blades are straight blades, and the rotation plane of the blades of the rotor blades is perpendicular to the cross section of the blades.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model provides a rotor blade with a single-sided fan blade facing the tail pipe inlet in the tail pipe. In the process of crude oil entering the tail pipe through the pressure regulating tube, the pressure regulating tube will increase the impact force of the crude oil entering the tail pipe, so that the crude oil entering the tail pipe pushes the rotor blade to rotate. The rotation of the rotor blade can provide power for the swing member to rotate the swing rod, drive the rollers and the cleaning brush on both sides to move, and scrape and clean the side wall of the filter cover. After the swing rod is separated from the roller, the roller and the cleaning brush will continue to return to their original positions under the action of the elastic member on the same side, thereby realizing continuous scraping and cleaning of the side wall of the filter cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the mud scraping assembly of the utility model;

[0016] Figure 2 It is a cross-sectional view of the sand filtering device of the utility model;

[0017] Figure 3 It is a side view of the sand filtering device of the utility model;

[0018] Figure 4 This utility model Figure 1 A magnified schematic diagram of the middle part;

[0019] Figure 5 It is a schematic diagram of the overall structure of the sand filtering device of the utility model;

[0020] In the figure: 1. tail pipe; 2. filter cover; 3. mud scraper assembly; 31. guide rod; 32. cleaning brush; 33. elastic member; 34. roller; 4. swing member; 41. swing arm; 5. rotor blade; 6. pressure regulating tube; 7. rotating rod; 8. transmission assembly. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 The utility model provides a technical solution: a downhole oil pump sand filtering device, comprising a tail pipe 1 arranged at the lower end of the oil pump barrel, the tail pipe 1 and the pump barrel are sealed and connected through an oil pipe coupling, and the bottom of the tail pipe 1 is connected with a filter cover 2. By providing filter holes on the filter cover 2, the crude oil entering the tail pipe 1 can be filtered out to prevent the crude oil from carrying sand particles into the pump, blocking the oil flow channel, causing the pump to get stuck, and causing damage to the oil pump.

[0023] The filter cover 2 is provided with a scraper assembly 3 for cleaning the outside of the filter hole, which is used to scrape and clean the side wall of the filter cover 2 to prevent sand particles from adhering to the outer wall of the filter cover 2 and affecting the oil pumping efficiency of the oil pump. The filter cover 2 is also provided with a swinging member 4 for driving the scraper assembly 3. Rotor blades 5 are rotatably provided at the inlet of the tail pipe 1, and the rotor blades 5 are connected to the swinging member 4. When the oil pump pumps oil, crude oil will enter the tail pipe 1 through the filter cover 2. The crude oil entering the tail pipe 1 will impact the fan blades of the rotor blades 5 at the inlet of the tail pipe 1, causing the rotor blades 5 to rotate. The rotation of the rotor blades 5 can provide power to the swinging member 4, so that the swinging member 4 drives the scraper assembly 3 to work, so as to scrape and clean the side wall of the filter cover 2 and improve the oil pumping efficiency of the oil pump.

[0024] Specifically, the tail pipe 1 is connected to the filter cover 2 through the pressure regulating pipe 6, which is a transition pipe. The cross-sectional radius of the pressure regulating pipe 6 is smaller than the cross-sectional radius of the tail pipe 1. Through the setting of the pressure regulating pipe 6, according to the Bernoulli equation, there is an inverse relationship between the flow velocity and the pressure, that is, when the flow velocity decreases, the pressure increases.

[0025] In the process of liquid flowing from the thin tube to the thick tube, the flow velocity will decrease accordingly due to the sudden increase in the cross-sectional area of ​​the pipe. This decrease in flow velocity will lead to an increase in pressure, increasing the impact force of the crude oil entering the tail pipe 1 on the blades of the rotor blades 5, thereby increasing the driving force provided to the swing member 4 by the rotation of the rotor blades 5. In addition, due to the high viscosity of crude oil, the internal friction resistance of the crude oil fluid increases, and a large pressure change will also occur in the process of the thin tube becoming a thick tube.

[0026] Specifically, the center of the rotor blade 5 is directly opposite to the edge of the pressure regulating tube 6 , so that the impact of the crude oil can push the rotor blade 5 to rotate in one direction.

[0027] Specifically, the scraper assembly 3 includes a guide rod 31 fixed to the side wall of the filter cover 2, a base is welded and fixed to the side wall of the filter cover 2, the guide rod 31 is fixed between two opposite bases, the outer wall of the guide rod 31 is slidably sleeved with a cleaning brush 32 that slides and abuts against the side wall of the filter cover 2, a linear bearing is fixed through the top of the cleaning brush 32, and the cleaning brush 32 slides up and down on the outer wall of the guide rod 31 through the linear bearing, so that the cleaning brush 32 can move up and down along the guide rod 31, so that the cleaning brush 32 can scrape and clean the sand attached to the side wall of the filter cover 2.

[0028] The guide rod 31 is provided with an elastic member 33 connected to the cleaning brush 32. The elastic member 33 can be a compression spring. When the swing member 4 drives the scraper assembly 3 to clean the side wall of the filter cover 2, the swing member 4 can push the cleaning brush 32 to move, and scrape and clean the side wall of the filter cover 2 once. Then, the cleaning brush 32 can be restored to its original position under the action of the elastic member 33 to scrape and clean the side wall of the filter cover 2 for a second time. This process is repeated to achieve efficient cleaning of the side wall of the filter cover 2.

[0029] Specifically, a roller 34 is rotatably provided on the side wall of the cleaning brush 32, and an annular positioning groove is formed on the outer wall of the roller 34. The swing member 4 includes a rocker rod 41 rotatably connected to the filter cover 2, and the rocker rod 41 corresponds to the positioning groove. The rocker rod 41 is adapted to the roller 34. When the rocker rod 41 rotates, the rocker rod 41 can press the roller 34 on one side to move downward, thereby driving the cleaning brush 32 on the same side to move downward, so as to scrape and clean the side wall of the filter cover 2.

[0030] When the roller 34 is pressed to the bottom of the guide rod 31, the swing rod 41 will be separated from the roller 34, so that the swing rod 41 releases the blocking pressure on the roller 34, and the roller 34 and the cleaning brush 32 on the same side will quickly recover under the action of the elastic member 33 on the same side, and the swing rod 41 will continue to rotate. Figure 1 , Figure 2 , Figure 3 As shown, two groups of scraper assemblies 3 are provided and are arranged on opposite side walls of the filter housing 2. The rollers 34 of the scraper assemblies 3 on both sides are arranged on the side of the cleaning brush 32 close to the swing member 4, and the elastic member 33 is arranged on the opposite side of the cleaning brush 32 (that is, the elastic member 33 of the left scraper assembly 3 is arranged on the upper side of the cleaning brush 32 on the same side, and the elastic member 33 of the right scraper assembly 3 is arranged on the lower side of the cleaning brush 32 on the same side).

[0031] Under normal conditions, the cleaning brush 32 and roller 34 on the left are at the lower part of the guide rod 31, and the cleaning brush 32 and roller 34 on the right are at the upper part of the guide rod 31). After the swing rod 41 disengages from the right roller 34, it will continue to rotate, and then push the left roller 34 and cleaning brush 32 upward. When the left roller 34 and cleaning brush 32 reach the upper part of the guide rod 31, the swing rod 41 will disengage from the left roller 34, so that the swing rod 41 releases the blocking pressure on the left roller 34, and the left roller 34 and cleaning brush 32 will continue to return to their original positions under the action of the elastic member 33 on the same side, thereby achieving continuous scraping and cleaning of the side wall of the filter cover 2.

[0032] Specifically, a rotating rod 7 is fixedly connected to the center of the side wall of the rotor blade 5. The rotating rod 7 passes through the tail pipe 1 and is connected to a transmission assembly 8. The rotating rod 7 and the tail pipe 1 are sealed and connected. The transmission assembly 8 is connected to the swing member 4. The rotor blade 5 can drive the swing member 4 through the transmission assembly 8.

[0033] Specifically, the transmission assembly 8 is connected by multiple gear transmissions, a rotating shaft is connected between the swing member 4 and the filter cover 2, and the gear set completes the transmission effect through four bevel gears and an optical axis, wherein two bevel gears are respectively sleeved on the outer walls of the rotating shaft and the rotating rod 7 and fixed thereto, the two bevel gears are respectively meshed with two other bevel gears, and the other two bevel gears are coaxially connected through the optical axis.

[0034] Specifically, the blades of rotor blade 5 are straight blades, and the rotation plane of the blades of rotor blade 5 is perpendicular to the cross-section of the blades, that is, the blades of rotor blade 5 are horizontally arranged, and the trajectory of crude oil entering tail pipe 1 through the inlet of tail pipe 1 is perpendicular to the blades. This design enables the blades to effectively utilize the impact force of crude oil and convert it into rotational force.

[0035] The outer walls of the tail pipe 1 and the filter cover 2 are both provided with protective covers, such as Figure 5 As shown, this prevents parts from being damaged during the process of lowering the device into the well.

[0036] Working principle:

[0037] The sand filter device is extended into the well with the oil pump. When the oil pump is working, the external crude oil will enter the filter cover 2 through the filter holes and enter the tail pipe 1 through the pressure regulating pipe 6. By providing filter holes on the filter cover 2, the crude oil entering the tail pipe 1 can be filtered, so that the sand particles are retained outside, preventing the crude oil from carrying sand particles into the pump.

[0038] After long-term use, some sand particles will adhere to the outer wall of the filter cover 2. In the process of crude oil entering the tail pipe 1 through the pressure regulating tube 6, the pressure regulating tube 6 will increase the impact force of the crude oil entering the tail pipe 1, so that the crude oil entering the tail pipe 1 pushes the rotor blades 5 to rotate. The rotation of the rotor blades 5 can provide power to the swing member 4 through the gear set to rotate the swing rod 41. The rotation of the swing rod 41 can drive the rollers 34 and the cleaning brush 32 on both sides to move, so as to scrape and clean the side wall of the filter cover 2. After the swing rod 41 is separated from the roller 34, the roller 34 and the cleaning brush 32 will continue to return to their original positions under the action of the elastic member 33 on the same side, thereby achieving continuous scraping and cleaning of the side wall of the filter cover 2.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A downhole oil well pump sand filter device, comprising a tail pipe (1) arranged at the lower end of the oil well pump barrel, characterized in that: The bottom of the tail pipe (1) is connected to a filter cover (2), the filter cover (2) is provided with filter holes, the filter cover (2) is provided with a scraper assembly (3) for cleaning the outside of the filter holes, the filter cover (2) is also provided with a swing member (4) for driving the scraper assembly (3), and a rotor blade (5) is rotatably provided at the inlet of the tail pipe (1), and the rotor blade (5) is connected to the swing member (4).

2. The downhole oil pump sand filter device according to claim 1, characterized in that: The tail pipe (1) and the filter cover (2) are connected via a pressure regulating pipe (6), and the cross-sectional radius of the pressure regulating pipe (6) is smaller than the cross-sectional radius of the tail pipe (1).

3. The downhole oil pump sand filter device according to claim 2, characterized in that: The center of the rotor blade (5) is directly opposite to the edge of the pressure regulating tube (6).

4. The downhole oil pump sand filter device according to claim 1, characterized in that: The scraper assembly (3) comprises a guide rod (31) fixedly connected to the side wall of the filter cover (2); a cleaning brush (32) slidably sleeved on the outer wall of the guide rod (31) and slidably abutting against the side wall of the filter cover (2); and an elastic member (33) connected to the cleaning brush (32) is provided on the guide rod (31).

5. The downhole oil pump sand filter device according to claim 4, characterized in that: A roller (34) is rotatably provided on the side wall of the cleaning brush (32), and the swing member (4) comprises a swing rod (41) rotatably connected to the filter cover (2), and the swing rod (41) is adapted to the roller (34).

6. The downhole oil pump sand filter device according to claim 1, characterized in that: A rotating rod (7) is fixedly connected to the center of the side wall of the rotor blade (5); the rotating rod (7) passes through the tail pipe (1) and is connected to a transmission assembly (8); and the transmission assembly (8) is connected to the swing member (4).

7. The downhole oil pump sand filter device according to claim 6, characterized in that: The transmission assembly (8) is connected by a plurality of gear transmissions.

8. The downhole oil pump sand filter device according to claim 1, characterized in that: The blades of the rotor blades (5) are straight blades, and the rotation plane of the blades of the rotor blades (5) is perpendicular to the cross section of the blades.

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