Paraffin removal-free sucker rod
By designing a wax collection and conveying device on the suction rod, the automatic collection and conveying of wax is achieved, which solves the motion resistance and tripping problems caused by wax grafting of the suction rod, improves wax cleaning efficiency, reduces maintenance costs, and enhances equipment stability and service life.
Patent Information
- Application Number
- CN202422418512.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-08
AI Technical Summary
Existing suction rods are prone to wax during oil well operations, resulting in increased motion resistance, frequent tripping, high maintenance costs, and short equipment service life.
A wax-free oil extraction rod is designed, and a wax collection and conveying device is adopted, including a collection blade and a connecting seat. The collection blades automatically unfold and shrink when the oil extraction rod moves up and down, realizing one-way collection and conveying of wax.
It improves wax cleaning efficiency, reduces maintenance costs, enhances the stability of the suction rod, extends the service life of the equipment, and ensures continuous production of the oil well.
Smart Images
Figure CN223190381U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of oilfield development technology, particularly to the improvement of equipment and technology in oil production. It aims to solve the problems of wax deposition and high maintenance costs commonly seen in pumping rods during oil well operations, thereby improving oil production efficiency, reducing production costs, and ensuring long-term stable production in oil fields. In particular, it relates to a wax-free pumping rod. Background Art
[0002] Currently, the widely used pumper rod systems in oilfield production face multiple challenges during long-term operation. Crude oil in oil wells often contains a high proportion of wax, which easily condenses at low temperatures and adheres to the inner wall of the tubing and the surface of the pumper rod, forming a wax layer. Wax buildup not only increases resistance to pumper rod movement but can also cause rod string jamming or even disconnection, seriously impacting normal well production. Due to well inclination, the weight of the rod string, bottomhole fluid pressure, and the fluid in the well, the pumper rod is prone to twisting and bending during up-and-down movement, leading to connector disconnection. Disconnected pumper rods require reinstallation or replacement, increasing production costs and downtime. To address wax buildup and disconnection, oilfields typically employ regular maintenance methods such as hot washing or chemical wax removal. While effective, these methods are time-consuming and labor-intensive, requiring significant investment in both manpower and materials, increasing oilfield production costs. Frequent hot washing and chemical treatments, as well as the mechanical wear caused by wax buildup and disconnection, often shorten the service life of pumper rods and related equipment, necessitating frequent replacement and further increasing maintenance costs.
[0003] Given the current state of the art, wax-free sucker rod technology needs to address the following key challenges: Designing a device that can automatically remove wax deposits from the tubing and sucker rod surfaces, reducing mechanical resistance and failures caused by wax buildup; Improving the sucker rod's ability to resist pull-off; and Reducing maintenance costs. Through technological innovation, the frequency and complexity of well maintenance can be reduced, labor and material costs can be lowered, and the economic benefits of the oilfield can be improved.
[0004] Improve the material and structural design of sucker rods and related equipment to extend their service life. In summary, wax-free sucker rod technology requires in-depth research and innovation in structural design and automatic wax cleaning devices to solve the problems existing in existing technologies and improve the efficiency and economy of oilfield production. Utility Model Content
[0005] In order to solve the above problems, the utility model provides a wax-free sucker rod which has a simple structure and can realize one-way collection and transportation of wax, thereby realizing wax cleaning and wax prevention.
[0006] The utility model discloses a wax-cleaning-free sucker rod, comprising a sucker rod body, a wax collecting and conveying device provided on the circumference of the sucker rod body, the wax collecting and conveying device comprising a collecting blade for collecting and conveying wax and a connecting seat for connecting the sucker rod body and the collecting blade, the connecting seat being fixedly provided on the sucker rod body, the collecting blade being hinged to the connecting seat;
[0007] When the sucker rod body extends vertically downward into the oil well, the collecting blades shrink and lean against the sucker rod body. When the sucker rod body moves vertically upward toward the oil well mouth, the collecting blades expand, and the collecting blades and the sucker rod body form a collecting area that is concave toward the bottom of the oil well.
[0008] Preferably, at least two collecting and conveying devices are provided along the circumference of the sucker rod body to form a collecting and conveying assembly, and the collecting and conveying devices in the collecting and conveying assembly are located at the same height as the sucker rod body.
[0009] Preferably, a plurality of collecting and conveying assemblies are provided along the axial direction of the sucker rod body.
[0010] Preferably, the connecting seat includes an annular blade rack and a rack support, the annular blade rack is sleeved on the sucker rod body and fixedly connected to the sucker rod body through the rack support, the collecting blades are clamped on the annular blade rack through a clamping ring, the cross section of the clamping ring is C-shaped, the rack support is located at the C-shaped opening of the clamping ring, and a limiting column is fixedly provided on the clamping ring.
[0011] When the clamping ring rotates on the annular blade rack and the collecting blades are unfolded, the limiting column abuts against the sucker rod body;
[0012] When the clamping ring rotates on the annular blade rack and the collecting blades shrink and come close to the sucker rod body, the opening wall of the clamping ring close to the collecting blades abuts against the rack support.
[0013] Preferably, the collecting blades are fan-shaped, and the cross-section of the collecting blades is arc-shaped with a curvature of 3-10°. When the collecting blades are unfolded, the angle between the center line and the axis of the sucker rod body is 45-75°.
[0014] Preferably, the cross-section of the collecting blade away from the connecting seat is set to be wedge-shaped. When the collecting blade shrinks and abuts against the sucker rod body, the wedge-shaped end of the collecting blade and the sucker rod body form a gap that facilitates the flow of liquid between the collecting blade and the sucker rod body.
[0015] The utility model has a simple structure and is easy to use. It utilizes the collecting blades and the connecting seat arranged on the sucker rod body. When the sucker rod body is vertically extended downward into the oil well, the collecting blades are contracted and abutted against the sucker rod body. When the sucker rod body is vertically moved upward toward the oil well mouth, the collecting blades are unfolded, and the collecting blades and the sucker rod body form a collecting area recessed toward the bottom of the oil well, thereby realizing one-way collection and transportation of wax, and effectively realizing wax cleaning and prevention.
[0016] The beneficial effects of the present invention are as follows:
[0017] Improved wax removal efficiency: Wax-free sucker rods are typically equipped with an efficient wax scraper. This new device automatically removes wax deposits from the tubing and rod surfaces as the rod moves. Compared to traditional manual or chemical wax removal methods, this automatic wax removal mechanism significantly improves wax removal efficiency, reduces downtime, and increases the effective production time of the well. Reduced maintenance costs: Because wax-free sucker rods feature automatic wax removal, they reduce the need for hot washing or chemical wax removers, lowering maintenance costs. Furthermore, they reduce mechanical failures and downtime caused by wax deposits, further reducing oilfield production costs. Enhanced sucker rod stability: By improving the sucker rod structure and materials, wax-free sucker rods typically have improved torsion resistance, bending resistance, and wear resistance. These improvements enhance sucker rod stability, reduce tripping incidents, and ensure continuous and stable production of the well. Extended equipment service life: The wax-free sucker rod is designed with the long-term operational requirements of the equipment in mind. By selecting high-quality materials and optimizing the structural design, the equipment's corrosion resistance, high temperature resistance, and wear resistance are enhanced. These improvements help extend the service life of sucker rods and related equipment, reduce replacement frequency, and lower maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a top view of the utility model.
[0019] Figure 2 This is a cross-sectional view of the collection blade after expansion in one embodiment.
[0020] Figure 3 This is a schematic diagram of an embodiment in which the collecting blades are retracted and abut against the sucker rod body.
[0021] Figure 1-sucker rod body, 2-collecting blades, 3-support, 4-annular blade rack, 5-C-shaped opening. DETAILED DESCRIPTION
[0022] The utility model discloses a wax-free sucker rod, comprising a sucker rod body 1, a wax collecting and conveying device provided on the circumference of the sucker rod body 1, the wax collecting and conveying device comprising a collecting blade 2 for collecting and conveying wax and a connecting seat for connecting the sucker rod body 1 and the collecting blade 2, the connecting seat being fixedly provided on the sucker rod body 1, the collecting blade 2 being hinged to the connecting seat;
[0023] When the sucker rod body 1 extends vertically downward into the oil well, the collecting blades 2 shrink and lean against the sucker rod body 1. When the sucker rod body 1 moves vertically upward toward the oil well mouth, the collecting blades 2 unfold, and the collecting blades 2 and the sucker rod body 1 form a collecting area that is recessed toward the bottom of the oil well.
[0024] In one embodiment, at least two collecting and conveying devices are provided along the circumference of the sucker rod body 1 to form a collecting and conveying assembly, and the collecting and conveying devices in the collecting and conveying assembly are located at the same height of the sucker rod body 1 .
[0025] Several collecting and conveying assemblies are arranged axially along the sucker rod body 1 .
[0026] In one embodiment,
[0027] The connecting seat includes an annular blade frame 4 and a frame support 3. The annular blade frame 4 is sleeved on the sucker rod body 1 and is fixedly connected to the sucker rod body 1 through the frame support 3. The collecting blades 2 are clamped on the annular blade frame 4 through a clamping ring. The cross section of the clamping ring is C-shaped. The frame support 3 is located at the C-shaped opening 5 of the clamping ring. A limiting column is also fixed on the clamping ring.
[0028] When the clamping ring rotates on the annular blade rack 4 and the collecting blades 2 are unfolded, the limiting column abuts against the sucker rod body 1;
[0029] When the clamping ring rotates on the annular blade rack 4 and the collecting blades 2 shrink and come close to the sucker rod body 1 , the opening wall of the clamping ring close to the collecting blades 2 abuts against the rack support 3 .
[0030] In one embodiment, the collecting blades 2 are fan-shaped, and the cross-section of the collecting blades 2 is arc-shaped with a curvature of 3-10°. When the collecting blades 2 are unfolded, the angle between the center line and the axis of the sucker rod body 1 is 45-75°.
[0031] The end of the collecting blade 2 away from the connecting seat is set to be wedge-shaped. When the collecting blade 2 shrinks and abuts against the sucker rod body 1, the wedge-shaped end of the collecting blade 2 and the sucker rod body 1 form a gap between the collecting blade 2 and the sucker rod body 1, which is conducive to the flow of liquid into the gap. The flow of liquid into the gap is conducive to the expansion of the collecting blade 2, thereby realizing the collection of wax.
[0032] During use, when the sucker rod body 1 is extended vertically downward into the oil well, the collecting blades 2 are contracted and close to the sucker rod body 1, and the opening wall of the retaining ring close to the collecting blades 2 is abutted against the bracket 3. When the sucker rod body 1 moves vertically upward toward the oil well mouth, the collecting blades 2 are unfolded, the limit column is abutted against the sucker rod body 1, and the collecting blades 2 and the sucker rod body 1 form a collecting area recessed toward the bottom of the oil well, realizing one-way collection and transportation of wax, and effectively achieving wax cleaning and prevention.
Claims
1. A wax-free sucker rod, comprising a sucker rod body, characterized in that: A wax collecting and conveying device is provided on the circumferential surface of the sucker rod body, and the wax collecting and conveying device includes a collecting blade for collecting and conveying wax and a connecting seat for connecting the sucker rod body and the collecting blade, the connecting seat is fixedly provided on the sucker rod body, and the collecting blade is hinged to the connecting seat; When the sucker rod body extends vertically downward into the oil well, the collecting blades shrink and lean against the sucker rod body. When the sucker rod body moves vertically upward toward the oil well mouth, the collecting blades expand, and the collecting blades and the sucker rod body form a collecting area that is concave toward the bottom of the oil well.
2. The wax-free sucker rod according to claim 1, characterized in that: The collecting and conveying device is provided with at least two collecting and conveying assemblies along the circumference of the sucker rod body, and the collecting and conveying devices in the collecting and conveying assemblies are located at the same height as the sucker rod body.
3. A wax-free sucker rod as claimed in claim 2, characterized in that: A plurality of collecting and conveying assemblies are arranged along the axial direction of the sucker rod body.
4. The wax-free sucker rod according to claim 1, characterized in that: The connecting seat includes an annular blade rack and a rack support. The annular blade rack is sleeved on the sucker rod body and fixedly connected to the sucker rod body through the rack support. The collecting blades are clamped on the annular blade rack through a clamping ring. The cross section of the clamping ring is C-shaped. The rack support is located at the C-shaped opening of the clamping ring. A limiting column is also fixed on the clamping ring. When the clamping ring rotates on the annular blade rack and the collecting blades are unfolded, the limiting column abuts against the sucker rod body; When the clamping ring rotates on the annular blade rack and the collecting blades shrink and come close to the sucker rod body, the opening wall of the clamping ring close to the collecting blades abuts against the rack support.
5. The wax-free sucker rod according to claim 1, characterized in that: The collecting blades are fan-shaped, and the cross-sections of the collecting blades are arc-shaped with a curvature of 3-10 degrees. When the collecting blades are unfolded, the angle between the center line and the axis of the sucker rod body is 45-75 degrees.
6. The wax-free sucker rod according to claim 1, characterized in that: The cross section of one end of the collecting blade away from the connecting seat is set to be wedge-shaped. When the collecting blade shrinks and abuts against the sucker rod body, the wedge-shaped end of the collecting blade and the sucker rod body form a gap that facilitates liquid to flow into the collecting blade and the sucker rod body.