Machine and pump integrated submersible direct drive screw pump oil extraction device and method

Abstract

The invention discloses a machine and pump integrated submersible direct drive screw pump oil extraction device and method. A motor rotor is arranged outside, a motor stator is arranged inside, and the whole is arranged in a shell in a sleeved manner. A screw pump stator and the motor stator are relatively fixed, and rotation cannot happen. After starting, the motor rotor rotates and drives a flexible shaft, and then a screw pump rotor is driven to elevate well liquid. The machine and pump integrated submersible direct drive screw pump oil extraction device and method have the beneficial effects that the displacement is small, well type adaptability is high, the structure is compact, and one-time investment can be relatively reduced; and the shaft passing performance of a unit is improved,the oil well repairing avoiding period is prolonged, and cost reducing and effect increasing are achieved.

Description

technical field [0001] The invention belongs to the technical field of oil extraction in the petroleum and natural gas industry, and in particular relates to an oil extraction device and method of a submersible direct-drive screw pump integrated with a machine and a pump. Background technique [0002] (1) In recent years, the oil wells are mainly deviated wells and directional wells, the horizontal displacement increases, the wellbore trajectory is complex, and there are problems such as serious partial wear of tubing rods, high energy consumption, and high operation and maintenance costs; (2) for low permeability , ultra-low permeability and ultra-low permeability reservoirs, single well productivity is low; (3) The unit length of the current submersible direct drive screw pump device is relatively long (more than 13 meters), for 5 1 / 2″ casing or more For oil wells with small-sized casing, the unit’s passability in the highly deviated well section is not good. If it is used...

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Problems solved by technology

[0002] (1) In recent years, the oil wells are mainly deviated wells and directional wells, the horizontal displacement increases, the wellbore trajectory is complex, and there are problems such as serious partial wear of tubing rods, high energy consumption, and high operation and maintenance costs; (2) for low permeability , ultra-low permeability and ultra-low permeability reservoirs, single well productivity is low; (3) The unit length of the current submersible direct drive screw pump device is relatively long (more than 13 meters), for 5 1 / 2″ casing or more For oil wells with small-sized casing, the unit’s passability in the highly deviated well section is not good. If it is used for too long in the downhole, the unit may be stuck due to fouling, resulting in accidents where drilling and workover cannot be performed.

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