Device for preventing submersible electric pump from falling into well

Abstract

The invention relates to a device for preventing a submersible electric pump from falling into a well, and belongs to the field of downhole tools for oil extraction engineering in oil fields. The device is composed of an oil-distributing short joint, an upper joint, a clamping and centralizing assembly, a central pipe and a lower joint, wherein the clamping and centralizing assembly is composed ofa slip, a slide block, a hoop ring, a slip hanger, a track ring and a sheath. The sheath is arranged on the slip hanger through a fixing pin, and a reversing pin is arranged in the sheath at one endof the slip hanger through the track ring. The slip is movably installed on the slip hanger which is on one side of the fixing pin through the sheath, and the slip is in sliding contact connection with the upper joint. A central pipe sliding grove is formed in the central pipe corresponding to the clamping and centralizing assembly, the clamping and centralizing assembly is connected with the central pipe sliding groove in a sliding way through the reversing pin. The device for preventing the submersible electric pump from falling into the well adopts a prop-open mode of sliding contact connection between the slip and the upper joint, so that the radial pressure of the device is large, the fall prevention function is reliable, clamping-removal is convenient, and the working progress is notinfluenced; and the existing economic losses caused by fishing and workover and the like when an electric pump unit falling down the bottom of the well are effectively reduced.

Description

technical field [0001] The invention relates to a well drop prevention device for an electric submersible pump, which belongs to the field of downhole tools for oil production engineering in oil fields. Background technique [0002] my country's oilfields generally have harsh geological conditions and are difficult to develop. The submersible electric pump unit operates at high speed in a high-temperature and high-pressure environment, and is subject to long-term erosion by media such as oil, gas, water, sand, wax, and corrosive substances. At the same time, due to the high-speed operation of the motor itself, the submersible electric pump unit vibrates, Wear and tear, etc., causing the connection of the equipment to fall off or break. Once the connection of the submersible electric pump unit falls off or breaks, the electric pump unit will continue to fall, causing secondary damage to the unit and polluting the oil well, which must be salvaged. The greater the drop depth,...

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