Auto-rotation centralizer with dynamic pressure lubricating effect
A technology of centralizer and self-rotation, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., which can solve the problems of insufficient working life of centralizers, and achieve the effects of simple structure, reduced friction, and reduced wear
Inactive Publication Date: 2013-01-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem of insufficient working life of the existing centralizer, and provide a self-rotating centralizer with dynamic pressure lubrication effect, which changes the dry friction and boundary friction between the centralizer and the oil pipe into boundary friction , Fluid friction, change the unilateral wear of the centralizer into uniform wear, change the smooth surface of the centralizer into a non-smooth surface, and comprehensively improve the working life of the rod tube system
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[0009] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. The self-rotating centralizer with dynamic pressure lubrication effect is mainly composed of centralizer shaft (4), centralizer sleeve (5), coupling (1), spring washer (2) and positioning block (3), as shown in figure 1 shown. The centralizing sleeve (5) with a drum-shaped outer contour is firstly installed on the middle section of the centralizer shaft (4), and then the positioning block (3) and the spring washer (2) are installed, and finally the coupling (1) is screwed on the centralizer shaft (4). The upper end of the device shaft (4), and the spring washer (2) prevents the coupling (1) from loosening. The outer ends of the centralizer shaft (4) and the collar (1) are respectively provided with internal threads so as to be connected with the sucker rod.
[0010] When the sucker rod moves up and down, when the drum-shaped outer surface (c) of the cen...
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The invention relates to an auto-rotation centralizer with dynamic pressure lubricating effect, which comprises a centralizer shaft, a centralizing cover, a connecting hoop, a spring gasket and a positioning block, wherein the outer ends of the centralizer shaft and the connecting hoop are respectively provided with an inner screw thread to be connected with an oil pumping rod. The centralizer is characterized in that the outer surface of the centralizing cover is a drum-shaped outline with a certain curvature, the centralizing cover is in self-unlocking screw thread connection with the centralizer shaft, and the surface of the outline of the centralizing cover is evenly provided with circular pits. The centralizer has the advantages that when the centralizing cover which is in a drum shape and has tiny pits is contacted with the inner walls of an oil pipe, the dry friction and the boundary friction among rod pipes are changed into the boundary friction and the liquid friction, thereby greatly reducing the frictional force, the grinding grains scratch and sand grains among the rod pipes, reducing the abrasion of the centralizing cover and the wall of the oil pipe, and furthermore, the centralizing cover moves by means of axial direction and rotation when the oil pumping rod moves up and down, so that the abrasion among the rod pipes are even.
Description
technical field [0001] The invention relates to a sucker rod centralizing device in rod pumping equipment in an oil field, in particular to a self-rotating centralizer with dynamic pressure lubrication effect. technical background [0002] Pumping unit extraction is a traditional and dominant artificial lift extraction method in my country's petroleum industry. With the further exploitation of oilfields, many oilfields have entered the development period of ultra-high water cut. With the rise of water cut in oil wells and the increase of liquid extraction intensity, the proportion of inclined wells, directional wells and horizontal wells has increased significantly. Due to the inclination of the oil well and the instability of the sucker rod during the downstroke, the wear between the tubing and the sucker rod in the rod pumped well is becoming more and more serious. The phenomenon of oil pipe wear-through and sucker rod breakage often occurs, affecting the normal productio...
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IPC IPC(8): E21B17/10
Inventor 石永军曹凤婷叶勇张晨温长飞李传秀陈军
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)