Expandable leakproof well cleanout packer

Abstract

The invention relates to an expandable leakproof well cleanout packer, which comprises an upper joint, upper and lower connecting pipes, upper and lower central pipes, a valve ball, a righting block, a rubber cup and a leather cup, wherein the upper joint is in threaded connection with the upper connecting pipe, and the upper connecting pipe is in threaded connection with a valve hoop; the valve ball is arranged on a valve ball seat in the valve hoop to form a valve pressure relief device, and the lower end of the valve hoop is in threaded connection with an upper reducer joint; the upper reducer joint is in threaded connection with the upper central pipe, and the righting block is distributed on the periphery of the upper central pipe to form a leaf-hand righting pressure release device; the lower end of the upper central pipe is in threaded connection with a short coupling, and the movable joint jacket of the short coupling is in threaded connection with a lower nipple; the lower nipple is in threaded connection with a lower reducer joint, and the lower reducer joint is in threaded connection with the lower central pipe; the lower central pipe is provided with the rubber cup and the leather cup in a suspending way, and the lower end of the lower central pipe is in threaded connection with an adapter connector to form a sealed suspending device; and the lower connecting pipe is in threaded connection onto the adapter connector. The expandable leakproof well cleanout packer provided by the invention has the advantages of reasonable structure, short well cleanout time, energy saving and environmental protection, and the pollution of well cleanout liquid leakage to the formation is effectively prevented.

Description

technical field [0001] The invention relates to equipment for oil production, in particular to an expandable leak-proof well flushing packer. Background technique [0002] Now, most oil pumping wells need to be cleaned regularly or irregularly to remove the deposition of paraffin, colloidal asphalt and other solidified substances on the deep well pump valve or other flow parts, so as to eliminate pump leakage, improve pump efficiency and reduce load. Purpose. At present, the formation pressure of most oil wells is lower than the hydrostatic column pressure. In particular, the formation pressure of heavy oil wells is generally only 30%-50% of the hydrostatic column pressure. These wells leak more seriously during well cleaning and pollute the oil layer, resulting in poor well washing effect. The repair-free period of the oil well is shortened, which affects the oil production of the oil well and brings economic losses to the production unit. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

At present, the formation pressure of most oil wells is lower than the hydrostatic column pressure. In particular, the formation pressure of heavy oil wells is generally only 30%-50% of the hydrostatic column pressure. These wells leak more seriously during well cleaning and pollute the oil layer, resulting in poor well washing effect. Shorten the repair-free period of the oil well, affect the oil production of the oil well, and bring economic losses to the production unit

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