Multistage plunger super-long-stroke oil well pump

Abstract

The invention relates to a multistage plunger super-long-stroke oil well pump which is composed of a multistage rigid plunger and a super-long pump cylinder. The multistage rigid plunger comprises a sealed cavity part, a weighting part and multiple single-stage rigid plungers which are connected in series. The single-stage rigid plungers are in loose joint so that the multistage rigid plunger can be freely adjusted to adapt to the axial deviation of the super-long pump cylinder and solve the problem that the plunger is stopped. The super-long pump cylinder is formed by linearly connecting multiple finish-rolled and honed pump cylinder bodies through couplings. The middle of each coupling is provided with a spigot. Every two pump cylinder bodies are in threaded connection with the corresponding coupling, the fit clearance is smaller than or equal to 0.01 mm, each spigot is aligned so as to be located, the largest gap between the end faces of every two pump cylinder bodies which are in butt joint ranges from 0.1 mm to 0.2 mm, the straightness of the two butt-joint pump cylinder bodies is smaller than or equal to 0.04 mm each meter, connecting gaps of the super-long pump cylinder are small due to the connection mode between the pump cylinder bodies, and connecting faces are smooth. The multistage plunger super-long-stroke oil well pump has the advantages that the stroke of the oil well pump can be set at will according to the requirement of an oil well, and the range is from tens of meters to hundreds of meters.

Description

technical field [0001] The invention relates to an oil production equipment, in particular to a multi-stage plunger super long-stroke oil well pump. Background technique [0002] The length of the longest pump barrel in China is more than 9 meters, and it does not exceed 13 meters in foreign countries. In addition, due to the limitation of the structure of the rod pumping unit, at present, the stroke of the rod pumping unit is generally 6-8m. Oil pumps are not suitable for deep wells, low-permeability wells, heavy oil wells and gas-bearing wells; in addition, due to the requirements of the tubing sub-industry regulations between the plunger and the tubing, longer plungers are prone to encounter resistance when running in an overly long pump barrel The problem is that limited by factors such as the current oil production method and the sealing requirements of the wellhead blowout preventer on the sucker rod, there is no development of an oil well pump with a stroke exceeding ...

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Problems solved by technology

[0002] The length of the longest pump barrel in China is more than 9 meters, and it does not exceed 13 meters in foreign countries. In addition, due to the limitation of the structure of the rod pumping unit, at present, the stroke of the rod pumping unit is generally 6-8m. Oil pumps are not suitable for deep wells, low-permeability wells, heavy oil wells and gas-bearing wells; in addition, due to the requirements of the tubing sub-industry regulations between the plunger and the tubing, longer plungers are prone to encounter resistance when running in an overly long pump barrel The problem is that due to the current oil production method and the sealing requirements of the wellhead blowout preventer on the sucker rod, etc., there is no development of an oil well pump with a stroke exceeding ten meters in the industry.

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