Sucker-rod pump oil extraction system for oil well

Abstract

The invention relates to an oil extraction system for an oil well, and in particular relates to a sucker-rod pump oil extraction system used in mechanical oil extraction of the oil well, wherein the sucker-rod pump oil extraction system comprises a sleeve pipe and an oil pipe installed in the sleeve pipe; the oil pipe is internally provided with a rocker-rod oil extraction pump which comprises an oil-well pump and a sucker rod connected with the oil-well pump. The oil extraction system is characterized in that an oil sleeve annular space between the oil pipe and the sleeve pipe, close to the oil-well pump, is provided with a packer, thus the oil sleeve annular space is separated in upper and lower; the oil pipe corresponding to the above of the oil-well pump and the packer is connected with a hydraulic communicating valve; the crude oil pumped by the oil-well pump enters the oil sleeve annular space through the communicating valve; an oil outlet which is communicated with the sleeve pipe annular space is formed on the upper end of the sleeve pipe; and the oil pipe above the oil-well pump is internally filled with lubricating media. According to the invention, the abrasion between the rocker rod and the oil pipe can be relieved effectively; and the liquid flow quantity is great, the oil well oil extraction system can be used for a high-water-containing eccentric wear oil well with greater well depth, the construction is simple and convenient, and the cost is low.

Description

technical field [0001] The invention relates to an oil well production system, in particular to a rod pump oil production system in oil well mechanical production. Background technique [0002] In the oil production process of the rod pump in the oil well, the sucker rod and the tubing are in contact with each other and move relative to each other, so the problem of wear between the sucker rod and the tubing inevitably occurs; especially in high water-cut oil wells, the friction coefficient between the sucker rod and the tubing increases. Scale and corrosion act at the same time, so that the life of the sucker rod and tubing is greatly shortened, and the production cycle of the oil well is shortened. In order to overcome the above problems, a hollow rod anti-eccentric wear pumping device appeared, which replaced the solid sucker rod with a hollow sucker rod. The hollow sucker rod not only plays the role of power transmission, but also serves as the flow of oil production flu...

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Problems solved by technology

However, this device has the following disadvantages: the inner diameter of the hollow rod used as the oil production flow channel is small, and the internal flow rate is small, which limits the fluid production of the oil well, and the outer diameter of the hollow sucker rod is limited by the inner diameter of the tubing, so it cannot be expanded. Therefore, the device cannot be used in liquid production (40m 3 ) in larger eccentric wear wells

In addition, the hollow rod is limited by the manufacturing method (the joint and the rod body are welded by friction welding), and the tensile strength is low. When the pump depth is large, the load is large and it is easy to break, so it cannot be used in oil wells with large pump depth.

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