Self-lubricating string for rod and tubing wear prevention and sucker rod pumping of inclined wells

Abstract

The invention provides a self-lubricating string for rod and tubing wear prevention and sucker rod pumping of inclined wells, which is applied to sucker rod pumping of inclined wells in the oil field.The invention is characterized in that a packer is arranged between the external wall of an oil pipe and the internal wall of a casing and separates the annular space between the oil pipe and the casing into two unconnected parts; a separator, an on-off connector open short piece and an oil drain device are connected from bottom to top on the oil pipe above the packer; an on-off connector is connected from bottom to top on a sucker rod above the packer; a central sealing rod is connected with an oil well pump rod after penetrating the central hole of the separator; the lower end of the oil well pump rod is connected with a plunger piston in the oil well pump; a high water-cut well liquid discharge hole is arranged on a delivery connection wall at the lower part of the separator, and the high water-cut well liquid discharge hole is positioned above the packer. The invention has the effect that: the sucker rod is sealed in the oil pipe which is full of lubrication oil, thus decreasing the friction coefficient between the centralizer and the oil pipe, and solving the problem of lubrication between the sucker rod and the oil pipe in the high water-cut stage.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a plunger pump lifting process string used in inclined well oil production, and is a rod pump oil production rod tube anti-eccentric self-lubricating process string in an inclined well. Background technique [0002] At present, in the production of inclined wells with rods, the sucker rod reciprocates in the tubing, and friction occurs between the sucker rod and the inner wall of the tubing, commonly known as eccentric wear. People have used centralizers for many years to prevent friction and wear between oil pipes and sucker rods. See Figure 1. Its structure is as follows: there is an oil pipe 4 in the casing 5, a screw plug 15 and a screen pipe 14 are fixed at the lower end of the oil pipe, a sucker rod string connected by sucker rods 3 is arranged in the oil pipe 4, and a sucker rod string is formed at the lower end of the sucker rod string. An oil well pump 1...

AI Technical Summary

Problems solved by technology

To overcome the problem that the centralizer is worn out in a short time when the water content in the oil well production fluid is high,

Images