Rotary sand head

Abstract

The invention relates to the technical field of horizontal well washing tools, in particular to a rotary sand washing head. The rotary sand washing head comprises a guide head, a rotary washing barrel and a connecting sleeve, wherein the upper side of the guide head is wide, the lower side of the guide head is narrow, and the guide head is in the shape of an inverted frustum; a guide connecting rod is fixedly arranged at the upper end of the guide head, and a flow feed channel with an upward opening is formed in the guide head and the guide connecting rod; the lower portion of the guide connecting rod is sleeved with the rotary washing barrel capable of rotating, a groove is formed in the rotary washing barrel, and a washing ring cavity is formed between the rotary washing barrel and the guide connecting rod. The rotary sand washing head is reasonable and compact in structure and convenient to use; when the rotary washing barrel sprays fluid to wash sand, the rotary washing barrel can quickly rotate under the action of washing fluid, and the washing effect is greatly improved; under the situation that water injection displacement is small, the sand removal demand can still be met; meanwhile, nozzles in washing holes can conduct throttling acceleration on the washing fluid flowing through the washing holes, so that the washing fluid forms turbulent flow, carries sand grains to ascend spirally and goes out of a shaft circularly, and the effect of efficient plugging releasing is achieved.

Description

technical field

[0001] The invention relates to the technical field of horizontal well flushing tools, and relates to a rotary sand flushing head. Background technique

[0002] With the increase of horizontal wells in the oilfield, the phenomenon of sand production in the horizontal section is becoming more and more serious. Although punching and slotted pipes are used for sand control, it is still very easy to produce sand due to reasons such as shallow burial depth, loose formation cementation, and high viscosity of crude oil; while the horizontal section After sand accumulation, the coiled tubing supporting flushing tools are mainly used to flush and remove sand; during the flushing and sand removal process, the amount of sand removal is proportional to the water injection displacement, that is, the larger the water injection displacement and the higher the water pressure, the better the sand washing effect ; But this not only seriously wastes water resources, but also ha...

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