a sucker rod

Abstract

The invention discloses a sucker rod. The sucker rod comprises a rod body, an upper connector connected onto the upper end surface of the rod body and a lower connector connected onto the lower end surface of the rod body, and the rod body is an integrated rod body which is formed by connecting single section sucker rods of a designed number in a welding mode. The sucker rod is characterized in that the integrated rod body is a cone-shaped body, and any cross section of the cone-shaped body changes continuously and unidirectionally based on equal strength requirements. The sucker rod has the advantage of being lightweight, small in working stress, energy-saving and cost-reducing and the like.

Description

technical field [0001] The invention relates to oil extraction equipment, in particular to a sucker rod. The sucker rod has a continuously varying cross-section based on iso-strength. Background technique [0002] The rod pumping method is one of the traditional oil production methods in the world's petroleum industry, and it is also the artificial lift method that has been dominant in oil production engineering so far. According to statistics in the 1990s in the 20th world, the number of mechanical oil wells in the world has accounted for more than 90% of the total number of oil wells, and 80-85% of them all utilize rod pumps to pump oil wells. This shows that the use of rod pump oil extraction has occupied a major position in crude oil extraction all over the world. [0003] At present, there are three main types of sucker rod connection methods for oil exploitation: [0004] The first type is ordinary sucker rod; the length of a single sucker rod is only 7 to 9 meters,...

AI Technical Summary

Problems solved by technology

This type of sucker rod has many disadvantages: severe wear at the coupling; high failure frequency; high labor intensity; serious material waste; piston effect; easy to cause tripping and partial wear; low operating efficiency; meanwhile, the price of the sucker rod is also low. Relatively high

This type of sucker rod avoids the piston effect and tripping caused by the coupling connection, and also reduces the wear and failure frequency of the rod string and oil pipe, but this type of sucker rod does not reduce the overall quality of the rod body, and It also increases the professional supporting equipment and special transportation equipment for going down the well

[0006] The third type is segmented equal-diameter continuous sucker rod; the length and connection method of a single section of the sucker rod are the same as those of the second type of equal-diameter continuous sucker rod. Compared with the above two types of sucker rods, the weight of the type sucker rod is 8-10%, which saves materials to a great extent, reduces the cost, reduces the failure frequency, working stress and gearbox torque; but because this type of sucker rod There will be a sudden change in the welding of joints with different diameters, which will increase the running resistance and easily cause wax deposition on the pole

If such low-yield oil wells continue to use the existing sucker rods for oil production, it will inevitably form a state of big horses and small carts, resulting in a situation of high energy consumption and poor efficiency, which seriously restricts the improvement of production efficiency of low-yield oil wells

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