Continuous negative pressure sand washing device and system thereof

Abstract

The invention relates to the technical field of sand washing of oil fields and oil wells, particularly to a continuous negative pressure sand washing device and a system thereof. The continuous negative pressure sand washing device comprises a sleeve, a liner pipe and a sand washing pipe, and the sleeve, the liner pipe and the sand washing pipe are sequentially arranged from outside to inside. The sand washing pipe is provided with a flow guiding hole, a flow jetting pump and a sand washing head from top to bottom. The lower end of the liner pipe is slidably sealed with the sand washing pipe; liquid outlet cavities are formed between the liner pipe and the sand washing pipe; an inner pipe cavity of the sand washing pipe communicates with the liquid outlet cavities through the flow guiding hole; the sleeve and the sand washing pipe are slidably sealed through first sealing pieces; a liquid injecting cavity is formed among the first sealing pieces, the liner pipe, the sand washing pipe and the sleeve; and liquid in the liquid injecting cavity is sprayed into the inner pipe cavity of the sand washing pipe through the flow jetting pump and carries the liquid from the sand washing hole. The continuous negative pressure sand washing system comprises the continuous negative pressure sand washing device and an operating machine. According to the continuous negative pressure sand washing device and the system, the technical problems that in the prior art, the construction efficiency of sand bailing operation is low and oil layers are prone to be polluted by sand washing are solved.

Description

technical field [0001] The invention relates to the technical field of oil well sand washing, in particular to a continuous negative pressure sand washing device and a system thereof. Background technique [0002] After the oil well produces sand, if the liquid flow in the well cannot bring all the sand to the surface, the sand in the well will gradually deposit, the sand column will increase, block the oil outlet channel, increase the flow resistance, and cause the oil well to reduce production or even stop production. At the same time, it will damage the downhole equipment and cause sand jam accidents. Therefore, measures must be taken to remove the accumulated sand, and sand washing is usually used to solve this problem. [0003] Sand flushing is to use high-speed flowing liquid to wash away the sand plug at the bottom of the well, and use the circulation ability of the liquid flow to bring the broken sand out of the ground, so as to remove the sand accumulation at the b...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a continuous negative pressure sand washing device and its system to solve the technical problems of low construction efficiency of sand dredging operations and easy pollution of oil layers by sand washing in the prior art

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