CN202483473U

CN202483473U - Eccentric-abrasion-proof automatic centering and centralizing device of oil sucking rod

Info

Publication number: CN202483473U
Application number: CN201220105257XU
Authority: CN
Inventors: 王香增; 王书宝; 陶红胜; 赵亚杰; 李国明; 杨永超; 张兴涛; 洪千里; 王青青; 展转盈
Original assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Current assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Priority date: 2012-03-20
Filing date: 2012-03-20
Publication date: 2012-10-10
Anticipated expiration: 2022-03-20

Abstract

The utility model relates to an eccentric-abrasion-proof device of an oil sucking rod, in particular to an eccentric-abrasion-proof automatic centering and centralizing device of the oil sucking rod. An existing eccentric-abrasion-proof centralizer of the oil sucking rod is in linear face friction and even point face friction with an oil pipe, and abrasion is large. The cross section of a centralizing body is oval, the oval section area gradually decreases from the middle of the centralizing body to the end portions of the centralizing body at two ends, and the oval section radius is not changed. A vertically penetrated oil sucking rod sliding hole is arranged at the axial center of the centralizing body. The centralizing body adopts ultra high molecular weight polyethylene materials. The device can prolong pump detection period to over 100 days and simultaneously has the advantages of being convenient to install, simple in structure and the like.

Description

A kind of sucker rod is prevented eccentric wear automatic capturing erection device

Technical field

The utility model relates to the anti-eccentric wear device of a kind of sucker rod, is specifically related to the anti-eccentric wear automatic capturing erection device of a kind of sucker rod.

Background technology

During the oil pumper course of normal operation, because the hole deviation or the deflection of oil-well self, and the bending of sucker rod under Axial Loads, can cause rod collar directly to contact with oil pipe, in the upper and lower reciprocating motion process of sucker rod, produce mechanical wear.Because the fluid that has been full of from the stratum in the oil pipe contains landwaste of different nature, these landwaste can cause the abrasive wear between rod collar and the oil pipe simultaneously.Often contain H in the fluid in the well in addition ₂S, CO ₂Oil pipe and box cupling there is the material of chemical attack effect with bacterium etc.More than several kinds of factors be present in simultaneously in the wear process of rod collar and oil pipe, under suitable temperature and sour environment, the wear extent between box cupling and the oil pipe is strengthened.Wearing and tearing each other during sucker rod pumps in oil pipe, bar, the loss of pipe eccentric wear not only directly influence Production Wells, and pump detection period shortens, and a large amount of sucker rods, oil pipe are scrapped in advance, has increased the workload of rod-pumped well maintenance activity simultaneously.High angle hole such as sidetracked hole, directional well constantly increases in recent years, occurs the rod and tube partial-wear problem more easily, and the oil well pump detection period that causes because of rod and tube partial-wear reduces and the increase of operating cost has become very important problem of petroleum production engineering.

The anti-the most suitable method of eccentric wear of oil pumping rod tube installs centralizer additional on sucker rod; Present centralizer is of a great variety; But there are a lot of defectives; Mainly show as: between centralizer and the oil pipe friction of line face, or even the friction of some face, the fluid resistance that centralizer produces when also not considering up-down stroke during the centralizer design.Thereby change the line face friction between existing centralizer and the oil pipe, or even the friction of some face is very necessary.

Summary of the invention

The purpose of the utility model provides the anti-eccentric wear automatic capturing erection device of a kind of sucker rod, and it can effectively reduce the friction of centralizer body and tube inner wall.

The technical scheme of the utility model is; Design the anti-eccentric wear automatic capturing erection device of a kind of sucker rod; It is characterized in that: the lateral cross section of centralizer body body is shaped as ellipse, and the centralizer body end of oval cross section area from the centralizer body middle part to two ends reduces gradually, and the oval cross section radius of curvature is constant; The axial centre of described centralizer body body is provided with the sucker rod sliding eye of up/down perforation.

The elliptical cross section area of described centralizer body body successively decreases by constant gradient to the centralizer body end at two ends from the centralizer body middle part, and the oval cross section radius of curvature is constant.

Described centralizer body body is that superhigh molecular weight polyethylene material constitutes.

The axial length of described centralizer body body is less than the spacing of box cupling.

The utlity model has following advantage: because the anti-eccentric wear automatic capturing erection device of this sucker rod; The lateral cross section of its centralizer body body is shaped as ellipse; The centralizer body end of oval cross section area from the centralizer body middle part to two ends reduces gradually, and the oval cross section radius of curvature is constant; So it can effectively reduce the friction of centralizer body and tube inner wall.The utility model can prolong pump detection period more than 100 days than existing erection device, have simultaneously easy for installation, advantages of simple structure and simple.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the utility model is described further:

Fig. 1 is the embodiment installation drawing;

Fig. 2 is the example structure sketch map;

Fig. 3 is the embodiment axial section;

Fig. 4 is the centralizer body body mortar abrasion index comparison diagram of various materials.

Among the figure: 1-box cupling, 2-sucker rod, 3-centralizer body body, 4-centralizer body end, 5-centralizer body middle part, 6-sucker rod sliding eye.

The specific embodiment

Embodiment 1 this sucker rod is prevented eccentric wear automatic capturing erection device, and the lateral cross section of centralizer body body 3 is shaped as ellipse, and the oval cross section area reduces from the 5 centralizer body ends 4 to two ends, centralizer body middle part gradually, and the oval cross section radius of curvature is constant; The axial centre of described centralizer body body 3 is provided with the sucker rod sliding eye 6 of up/down perforation.

Embodiment 2 as shown in Figures 2 and 3, the lateral cross section of centralizer body body 3 is shaped as ellipse, the oval cross section area 5 evenly successively decreases to the centralizer body end 4 at two ends from centralizer body middle part gradually, the oval cross section radius of curvature is constant; The axial centre of centralizer body body 3 is provided with the sucker rod sliding eye 6 of up/down perforation, can axially rotate around short circuit sucker rod 2.The axial length of centralizer body body 3 can move up and down along sucker rod 2 less than the spacing of box cupling 1 by a small margin.When use as shown in Figure 1 is installed, be socketed with centralizer body body 3 on the well rod 2, well rod 2 two ends are connected with box cupling 1; Work as sucker rod 2 off-centre during use; The axial length of described centralizer body body 3 is less than the spacing of adjacent box cupling 1, is convenient to axially rotation and play and automatic capturing contacts with tube inner wall with maximum circular arc at last by a small margin up and down like this; Thereby increased the contact area of centralizer body body 3, reduced the frictional force of centralizer body body 3 with tube inner wall with tube inner wall.

Centralizer body body 3 can adopt superhigh molecular weight polyethylene material (on sale on this material market).Ultra-high molecular weight polyethylene is described as " surprised plastics " by the expert, its molecular structure is identical with PE, but relative molecular weight is its 20 times.The common PE relative molecular weight is generally at 5-30 ten thousand.And ultra-high molecular weight polyethylene is up to 150-600 ten thousand.The molecular weight of superelevation is also given its a lot of special performances.Utilize material different to carry out the mortar wear testing, detect the mortar abrasion index of various materials, as shown in Figure 4.Fig. 4 is illustrated in the test of mortar wearing and tearing method down, the polishing machine comparative result of the abrasion resistance properties of ultra-high molecular weight polyethylene and other materials.Test conditions is: mortar is made up of 2 parts of water, 3 parts of sand, the rotating speed 900r/min of test; The duration of runs 7h.Test result shows: under similarity condition the mortar abrasion index of ultra-high molecular weight polyethylene be MC nylon 1/4, be carbon steel 1/7, be 1/27 of brass; The anti-wear performance that ultra-high molecular weight polyethylene is described is quite superior, and its abrasion resistance properties occupies first of the plastics.

Claims

1. a sucker rod is prevented eccentric wear automatic capturing erection device; It is characterized in that: the lateral cross section of centralizer body body (3) is shaped as ellipse; The centralizer body end (4) of oval cross section area from centralizer body middle part (5) to two ends reduces gradually, and the oval cross section radius of curvature is constant; The axial centre of described centralizer body body (3) is provided with the sucker rod sliding eye (6) of up/down perforation.

2. a kind of sucker rod according to claim 1 is prevented eccentric wear automatic capturing erection device; It is characterized in that: the elliptical cross section area of described centralizer body body (3) successively decreases by constant gradient to the centralizer body end (4) at two ends from centralizer body middle part (5), and the oval cross section radius of curvature is constant.

3. a kind of sucker rod according to claim 1 and 2 is prevented eccentric wear automatic capturing erection device, it is characterized in that: described centralizer body body (3) is that superhigh molecular weight polyethylene material constitutes.

4. according to the anti-eccentric wear automatic capturing erection device of the said a kind of sucker rod of claim 1, it is characterized in that: the axial length of described centralizer body body (3) is less than the spacing of box cupling (1).