Eccentric Feedback Pump and Process Method for Heavy Oil Separate Injection and Combined Production

Abstract

The invention discloses a thickened oil separate injection and commingled production eccentric feedback pump and a technological method, and belongs to the technical field of oil field separate injection and commingled production. The thickened oil separate injection and commingled production eccentric feedback pump comprises an upper connector, an upper pump cylinder, an oil outlet connector, an outer cylinder, an upper plunger, an oil outlet valve, a valve connector, an eccentric oil inlet valve, an oil inlet valve, a central tube, an eccentric connector, a lower pump cylinder, a lower connector and a lower plunger. The thickened oil separate injection and commingled production eccentric feedback pump is characterized in that the upper end of the upper connector is provided with internal threads and can be connected with a steam injection tubular column, the lower end of the upper connector is provided with internal threads and connected with the upper pump cylinder, the outer wall of the upper pump cylinder is designed to be of an upper layer steam injection hole structure, the inner wall of the upper pump cylinder is designed to be of a lower layer steam injection groove structure, the lower end of the upper pump cylinder is provided with external threads and connected with the outer cylinder, the outer cylinder is connected with the eccentric connector on the lower portion, the eccentric connector is connected with the eccentric oil inlet valve and the lower pump cylinder, the eccentric oil inlet valve comprises an eccentric oil inlet valve ball, an eccentric oil inlet valve base and a compression connector, the lower end of the lower pump cylinder is connected with the lower connector, and the lower connector is connected with the steam injection tubular column. The thickened oil separate injection and commingled production eccentric feedback pump is simple in structure, convenient to construct, and capable of achieving one-time wall maintenance pump-placing-down multi-round huff and puff layered steam injection and oil pumping.

Description

technical field [0001] The invention relates to an eccentric feedback pump and a process method for separate injection and combined production of heavy oil, and belongs to the technical field of separate injection and combined production in oilfields. Background technique [0002] Heavy oil reservoirs are generally produced by steam injection huff and puff. Decades of production have proved that due to the heterogeneity of formation reservoirs and the over-coverage of steam, the production imbalance on the reservoir profile after steam injection is caused. From the tested air suction profile and liquid production profile, most of the steam injected into the wellbore is absorbed by the middle and upper part of the oil layer, while the lower part sucks little gas. With the increase of the throughput rounds, the steam always enters the formed channel. The upper part of the oil layer, while the lower part of the oil layer is less developed. [0003] In response to this situatio...

AI Technical Summary

Problems solved by technology

The combination of thermal recovery packer and sliding sleeve is used to cast cores and change layers on the ground, and then inject steam into the upper and lower layers in sequence. After the brine is completed, the lower pump is pumped. The lower pump needs to wait for the temperature of the well head to drop before it can operate. This will lose part of the steam heat and delay production

There is also a combination of a thermal recovery packer, a rod pump and a layered steam injection sleeve to realize steam injection in the upper and lower layers through the layered steam injection sleeve, and the pumping is directly performed after the steam injection. This technology realizes one trip of the string Separate injection and combined production, use the best time to produce, avoid steam loss, the disadvantage is that the pipe string is one-time, and the pipe string needs to be run again for multiple rounds of huff and puff production

Images