CN111021997A

CN111021997A - Novel foldable brush type oil bailing swab

Info

Publication number: CN111021997A
Application number: CN202010080030.3A
Authority: CN
Inventors: 冯子明; 马擎洋; 丁宇奇; 郭晨浩; 孙瑞; 刘岂晨; 赵岩
Original assignee: Northeast Petroleum University
Current assignee: Northeast Petroleum University; Wenzhou University
Priority date: 2020-02-04
Filing date: 2020-02-04
Publication date: 2020-04-17
Anticipated expiration: 2040-02-04
Also published as: CN111021997B

Abstract

The invention relates to a novel foldable brush type oil bailing swab which comprises a mandrel, a pin shaft, meniscus plates, a tray and a brush, wherein the pin shaft is horizontally inserted into a through hole in an interference fit mode, a semicircular hole is formed in the center of each meniscus plate, the two meniscus plates are buckled on the two sides of the pin shaft through claws in a hinge connection staggered mode, and the two semicircular holes are combined into a circular hole to provide a space for the rotation of the meniscus plates and provide a channel for the flow of fluid; the brush is fixed at the edge of each half-moon plate; the tray is sleeved outside the mandrel and positioned below the two menisci, and the upper end surface of the lower hoop is propped below the tray; when the pumping piston is lowered, the meniscus rotates upwards by a certain angle, when the pumping piston stops, the meniscus rotates towards the horizontal direction by gravity, and when the pumping piston moves upwards, the meniscus is pressed to the horizontal position under the action of the gravity of the liquid column to form the pumping piston. The invention has good sealing effect when being used for low-permeability low-yield wells and ultra-low-yield wells, can efficiently dredge oil and pump oil, and can improve the production efficiency and economic benefit of artificial lifting.

Description

Novel foldable brush type oil bailing swab

Technical Field

The invention relates to an oil bailing swab for oil bailing production of a low-permeability and low-yield well, in particular to a novel foldable brush type oil bailing swab.

Background

In recent years, as the exploitation of oil fields enters the later stage, for some low-permeability and low-yield wells, the traditional oil well pump oil extraction method is not economical. These ultra-low production wells are insufficient in liquid supply capacity, such wells are basically in a long-term shutdown state, and if production is to be recovered, the problems of large measure risk, large workload and the like are faced, and the recovered production and investment ratio is low, so that the economic benefit is poor. Therefore, the swab becomes the main tool for oil production of such oil wells. Traditional oil bailing swab adopts rubber as the sealing material between swab and pit shaft mostly, but this type of material has better sealed effect, but also has defects such as intensity low, wear-resisting simultaneously, will appear after several times the swabbing sealed effect poor, the phenomenon of bold falling the dander, leads to oil bailing efficiency to reduce, so need a novel wear-resisting oil bailing swab of regular oil recovery, collect the residual oil in the oil well.

Disclosure of Invention

An object of the present invention is to provide a novel foldable brush type oil dipper, which is used to solve the problems of low strength, non-wear resistance, etc. of the conventional oil dipper.

The technical scheme adopted by the invention for solving the technical problems is as follows: the novel foldable brush type oil bailing swab comprises a mandrel, pin shafts, two half-moon plates, a tray and a brush, wherein a through hole is formed in the middle of the mandrel, the pin shafts are horizontally inserted into the through hole in an interference fit mode, a semicircular hole is formed in the center of each half-moon plate, the two half-moon plates are buckled on two sides of the pin shafts through holding claws in a hinge connection staggered mode, the two semicircular holes are matched to form a circular hole, a space is provided for rotation of the half-moon plates, and a channel is provided for fluid flow; the brush is fixed on the edge of each half-moon plate through a plurality of sunk screws which are distributed in the radial direction; the lower part of the mandrel is provided with threads, the tray is sleeved outside the mandrel and positioned below the two menisci, the lower coupling is in threaded connection with the mandrel, and the upper end face of the lower coupling is propped below the tray; when the pumping piston is placed downwards, the meniscus rotates upwards by a certain angle, when the pumping piston stops, the meniscus rotates towards the horizontal direction by gravity, and when the pumping piston moves upwards, the meniscus is pressed to the horizontal position under the action of the gravity of the liquid column, and the pumping piston is positioned at the horizontal position under the supporting action of the tray.

In the scheme, the length of the hair brush extending out of the meniscus is 3-5 mm.

The upper portion of dabber has the pin thread among the above-mentioned scheme, goes up the coupling and links to each other with the dabber screw thread, goes up the coupling and is connected with the sucker rod.

The lower end of the mandrel is connected with the weighting rod in the scheme, and the weighting rod can enhance the descending capacity of the oil bailing swab.

The novel foldable brush type oil bailing pump in the scheme is multiple and connected in series, so that the leakage amount can be reduced.

The invention has the following beneficial effects:

1. the invention takes the sleeve of the oil well as the pump barrel part, takes the oil bailing swab as the plunger of the oil pump, lifts the oil by utilizing the sliding sealing mechanism of the brush, realizes the section bailing of the oil column by the up-and-down movement of the oil pumping rod, and realizes the purpose of economic and effective mechanical oil extraction.

2. The brush is adopted between the swab and the sleeve to replace the traditional rubber, so that the sealing effect is improved, meanwhile, the wear-resisting purpose is realized, the residual substances on the wall of the well bore can be scraped, and the cleaning effect on the inner wall of the well bore is realized. And the brush sealing structure has certain elasticity, and can not be clamped when meeting the resistance of sundries on the pipe wall.

3. In the bailing process, the brush has the advantages of sealing produced liquid, removing residues on the wall of the well bore and preventing hard residues on the wall of the well bore from rubbing the swab. Better sealing effect, cleaning well shaft, no blocking of sucker and the like.

4. The invention has good sealing effect and long service life when being used for low-permeability low-yield wells and ultra-low-yield wells, can efficiently dredge oil and pump oil, and can improve the production efficiency and economic benefit of artificial lifting.

Drawings

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a bottom view of the overall structure of the present invention;

FIG. 3 is a top view of the overall structure of the present invention;

FIG. 4 is a perspective view of the overall structure of the present invention;

fig. 5 is a diagram of a meniscus configuration.

In the figure: 1-mandrel; 2-a pin shaft; 3-meniscus; 4-a tray; 5-a brush; 6-countersunk head screw.

Detailed Description

The invention is further described with reference to the accompanying drawings in which:

with reference to fig. 1-4, the novel foldable brush type oil bailing swab comprises a mandrel 1, a pin shaft 2, a meniscus 3, a tray 4 and a brush 5, wherein a through hole is formed in the middle of the mandrel 1, the pin shaft 2 is horizontally inserted into the through hole in an interference fit manner, and is guaranteed not to be displaced along the axial direction and rotate, so that the position of the meniscus 3 on the pin shaft 2 is determined. The number of the menisci 3 is two, the shape of the menisci 3 is shown in figure 5, a semicircular hole is formed in the center of each meniscus 3, the two menisci 3 are buckled on two sides of the pin shaft 2 in a hinge connection and staggered mode through claws, and the structure can realize the function that the menisci 3 are folded along the pin shaft 2; the two semicircular holes are combined into a circular hole, so that space is provided for the meniscus 3 to rotate upwards, and a channel is provided for fluid to flow along two sides of the pipe wall. The brush 5 is fixed on the edge of each meniscus 3 through a plurality of sunk screws 6 distributed in the radial direction; the lower part of the mandrel 1 is provided with threads, the tray 4 is sleeved outside the mandrel 1 and is positioned below the two menisci 3, the lower coupling is in threaded connection with the mandrel 1, and the upper end face of the lower coupling is propped below the tray 4. The displacement of meniscus 3 is limited and support is provided by the configuration of tray 4, the position of tray 4 being limited by the lower collar of the sucker rod coupling engaged with mandrel 1.

The upper end of the mandrel 1 is processed with male threads, and is connected with the upper coupling by adopting the upper coupling, and then is connected with the sucker rod. The coupling is a standard series of common sucker rod couplings and is not required to be additionally designed. The lower end of the mandrel 1 is also provided with male threads, the length of the male threads extends to the lower end of the tray 4, a lower coupling is connected with the lower end of the tray 4, the lower coupling is pushed to the lower end of the tray 4, the tray 4 is guaranteed not to change in position, and the fixing effect is achieved. The lower coupling is also a common sucker rod coupling standard series, has good interchangeability and belongs to a universal part.

When the swab is transferred, the center of meniscus 3 is opened has the semicircle orifice, and meniscus 3 can use round pin axle 2 to make certain angle of rotation upwards as the rotation axis, increase the through flow area, and it is little to make the swab transfer the resistance, transfers speed and accelerates, and the whole easier of swab of fishing for oil is marchd downwards along the sleeve pipe. When the swab reaches the bottom, the meniscus 3 slowly rotates towards the horizontal under the action of gravity. Even meniscus 3 does not fall back to horizontal position under gravity, the swab is gone upward and is begun the in-process, meniscus 3 can reach horizontal position fast under last liquid column action of gravity to by its displacement of tray 4 restriction, tray 4 plays the effect of supporting 3 horizontal positions of meniscus and liquid column weight simultaneously, meniscus 3 is in horizontal position owing to the supporting role of tray 4, forms the piston of pumping oil. In the process of bailing the swab, the brush 5 has better sealing effect, can seal produced liquid, remove residues on the wall of the well bore and prevent hard residues on the wall from rubbing the swab.

A semicircular integrated brush 5 is fixed at the lower edge of the meniscus 3 by using a countersunk head screw 6, and the extending length of the brush 5 is 3-5 mm. Because the traditional rubber sealing element has the defects of poor abrasion resistance and low hardness, the brush 5 is used for replacing the traditional rubber. The brush 5 has certain rigidity, can seal the gap leakage between the meniscus 3 and the casing wall, has certain elasticity, and can deform and pass when encountering a protruding blocking object on the casing wall surface, so that the pump is prevented from being clamped. The brush 5 can scrape and rub residual substances on the wall of the shaft and has a certain cleaning effect on the inner wall of the shaft. The brush 5 is made of steel wires and has good wear resistance.

The lower end of the oil bailing swab is also connected with a weighting rod through threads. The weighting rod can improve the descending capacity of the oil bailing swab, prevent the swab from being clamped and prevent the sucker rod from being bent, and reduce the friction force between the main pipes.

According to the actual condition of an oil well, a plurality of foldable brush type oil bailers can be used in series, and the leakage amount can be reduced.

Claims

1. The utility model provides a novel collapsible brush formula oil swab which characterized in that: the novel foldable brush type oil bailing swab comprises a mandrel (1), a pin shaft (2), two menisci (3), a tray (4) and a brush (5), wherein a through hole is formed in the middle of the mandrel (1), the pin shaft (2) is horizontally inserted into the through hole in an interference fit mode, two menisci (3) are arranged, a semicircular hole is formed in the center of each meniscus (3), the two menisci (3) are buckled on two sides of the pin shaft (2) in a hinge connection staggered mode through claws, the two semicircular holes are combined into a circular hole, a space is provided for rotation of the menisci (3), and a channel is provided for fluid flow; the brush (5) is fixed on the edge of each meniscus (3) through a plurality of countersunk head screws (6) distributed in the radial direction; the lower part of the mandrel (1) is provided with threads, the tray (4) is sleeved outside the mandrel (1) and positioned below the two menisci (3), the lower coupling is in threaded connection with the mandrel (1), and the upper end face of the lower coupling is propped below the tray (4); when the oil pumping device is placed downwards, the meniscus (3) rotates upwards for a certain angle, when the oil pumping device stops, the meniscus (3) rotates towards the horizontal direction by means of gravity, and when the oil pumping device goes upwards, the meniscus (3) is pressed to the horizontal position under the action of the gravity of a liquid column, and is positioned at the horizontal position under the supporting action of the tray (4) to form an oil pumping piston.

2. The novel collapsible brush oil dipper of claim 1, wherein: the length of the brush (5) extending out of the meniscus (3) is 3-5 mm.

3. The novel collapsible brush oil dipper of claim 2, wherein: the upper part of the mandrel (1) is provided with male threads, an upper coupling is in threaded connection with the mandrel (1), and the upper coupling is connected with the sucker rod.

4. The novel collapsible brush oil dipper of claim 3, wherein: the lower end of the mandrel (1) is connected with a weighting rod.

5. The novel collapsible brush oil dipper of claim 4, wherein: the novel foldable brush type oil bailing swab is provided with a plurality of oil bailing swabs which are connected in series, so that the leakage amount is reduced.