Device for filtering sand-containing viscous liquid

Abstract

The invention relates to a device for filtering sand-containing viscous liquid. The invention adopts a technical scheme that a medium connector (5) and a lower connector (6) are fixed on the upper endand the lower end of a lower sleeve (3) respectively; a round plane of the lower connector (6) is provided with 10 to 100 pores; a raised ring of the medium connector is provided with a circle of 10to 50 pores; a proportion of the length K of the lower sleeve (3) and the length L of an inner cartridge filter (4) and an outer cartridge filter (2) is 1:(1.5-3); two ends of the inner cartridge filter (4) and the outer cartridge filter (2) are respectively fixed on the inner surface and the outer surface of raised parts of an upper connector (1) and the medium connector (5) with a mounting clearance of between 5 and 105mm; filter pores of the inner cartridge filter (4) and the outer cartridge filter (2) are grid-shaped pores with length-width ratio of (10-700):1; the shape of the cross section of the grid-shaped pore is in a flaring shape, wherein the larger end of the flaring shape is outward. The device can obviously reduce blocking effect of the filter pores on the viscous liquid, inparticular to crude oil, enables the viscous liquid to pass through the filter pores easily so as to achieve an oil-well pump, and simultaneously maintains the blockage effect on sands.

Description

technical field [0001] The invention belongs to a filtering device. Specifically relates to a filtering device for viscous liquid containing sand. Background technique [0002] Petroleum is divided into light crude oil, conventional crude oil and heavy crude oil. The extraction of heavy crude oil requires more pretreatment processes and greater energy, and the use of screw pumps is a better way to extract heavy crude oil. Heavy crude oil in many places contains a lot of grit. The grit contained in the heavy crude oil causes the screw pump to be subject to abrasive wear and seriously affects the pumping efficiency and working life of the screw pump. [0003] To solve this problem, installing a filter device at the oil suction end of the screw pump to prevent sand and gravel from entering the inside of the screw pump can reduce the wear of the pump. However, the filter holes of ordinary filter devices are generally circular (processed holes) and rectangular (woven holes) w...

AI Technical Summary

Problems solved by technology

However, the filter holes of ordinary filter devices are generally circular (processed holes) and rectangular (woven holes) with similar length and width, and these holes are all straight cylindrical holes. The filter holes of this shape are useful for the passage of heavy crude oil. Greater resistance, that is, viscous crude oil is not easy to reach the inside of the oil pump through this filter hole

If the size of the filter hole is increased so that the filter hole reduces the hindrance to the passage of crude oil, the sand and gravel in the crude oil will be easier to pass through the filter hole and enter the interior of the pump, resulting in rapid wear of the pump.

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