FIELD: oil industry.
SUBSTANCE: invention relates to the production of oil with bottom hole pumps (BHP). Multistage device to protect the bottom hole pump against seizure is installed in the well below the bottom hole pump and includes fasteners, sand traps and a pressure differentiator located above the trap. Diameter of the pressure differentiator is less than the diameter of the trap. Differentiator and the trap is one stage of the device. Sand is collected in traps due to the pressure differential created by the pressure differentiator. First stage of the device is mounted on the tubing, and the second and subsequent stages are mounted on the above-mentioned steps.
EFFECT: use of the device allows to significantly increase the turnaround time of the work of bottom hole pumps and reduce the number of seizures of the BHP.
1 cl, 1 dwg
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