Flushable blockage removing and sand filtering device and blockage removing and sand filtering pipe column

Abstract

The invention discloses a flushable blockage removing and sand filtering device and a blockage removing and sand filtering pipe column. The flushable blockage removing and sand filtering device comprises a central pipe and outer pipes arranged on the outer side of the central pipe in a sleeving mode at intervals; the intervals form an annular cavity; and a spring, a supporting sleeve and a sand blocking stacked ring assembly are arranged in the annular cavity in a sleeved mode. A plurality of first liquid passing holes and a plurality of second liquid passing holes are formed in the side walls of the central pipe and the outer pipes correspondingly, the sand blocking stacked ring assembly comprises a plurality of sand blocking ring pieces which are stacked up and down, a plurality of upper through grooves and a plurality of lower through grooves are formed in the upper end face and the lower end face of each sand blocking ring piece at intervals correspondingly, and the longitudinal extension lines of the upper through grooves and the lower through grooves are arranged in an up-down crossed mode. According to the flushable blockage removing and sand filtering device and the blockage removing and sand filtering pipe column, the sand blocking particle size can be designed to be small, so that the situation that sand enters a pump to cause pump clamping is prevented; and when an overflowing channel is blocked, blocking objects can be washed away in a liquid beating washing mode, so that the sand blocking and overflowing capacity is recovered.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploitation, in particular to a flushable plugging-removing filter sand device and a plugging-removing sand filter pipe string. Background technique [0002] Unconsolidated sandstone reservoirs have shallow burial, poor diagenesis, loose formation cementation, and very common sand production, which has become one of the important factors affecting the development of unconsolidated sandstone reservoirs. [0003] The sand produced in the oil well will make the downhole oil pump work in an environment with sand particles. The sand particles will strongly wear the parts of the pump, which will cause the valve seat of the oil well pump to wear and not seal, pitting the valve ball, and the plunger and pump cylinder. Strain, increase the clearance of parts, reduce pump efficiency, and increase the cost. When the sand production is serious, the pump will be stuck and the oil well will stop produ...

AI Technical Summary

Problems solved by technology

However, when designing the sand retaining particle size of the sand anchor or screen, if the particle size design is too large, it is easy to cause sand particles to enter the pump, causing pump jams; Insufficient, causing oil well shutdown

At the same time, replace the new sand anchor or screen pipe while repeating the pump inspection, which also increases the operation cost and equipment cost virtually.

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