DEEP-WELL PUMPING UNIT FOR LIFTING PRODUCTS IN PRODUCTION STRING Russian patent published in 2017 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: unit includes a sucker rod pump containing a cylinder, a intake valve, a plunger with a controlled discharge valve connected to the sucker rod string with centralizers, and a bypass device. Below the bypass device there is a hollow shank with a packer made in the form of self-sealing rings and a stop. Below the packer and above the support, the shank is provided with side holes. The additional bypass device is made in the form of a sleeve connected to the shank and a hollow piston connected from below to the cylinder and configured to move limitedly and axially downwards against the sleeve with a sealed connection of the shank cavity with the under-plunger cavity of the cylinder. An additional bypass device is located above the bypass device. Above the sleeve of the additional bypass device, there is a casing in the form of a sleeve with lateral channels surrounding the cylinder of the pump with a gap and provided with a stop configured to interact with the upper end of the cylinder and positioned at a distance from the upper edge of the sleeve sufficient to grip the sleeve with an internal spear. The hollow piston is designed to be locked in the sleeve in the lower position. The locking force of the piston in the sleeve is less than the weight of the total weight of the shank with the casing.

EFFECT: invention makes it possible to reduce the complexity of mounting, dismantling, reduce the time of lowering or lifting the unit in a well, and to expand the field of application, improve reliability and maintainability.

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