Dragging and restraining type sand washing pipe string for horizontal well

Abstract

The invention provides a dragging and restraining type sand washing pipe string for a horizontal well. The dragging and restraining type sand washing pipe string for the horizontal well comprises a first oil pipe, a second oil pipe, an adapter pup joint, a speed governor assembly, a spray nozzle body and a turbulence sheet, wherein the first oil pipe is arranged in an oil well; a sand washing liquid return opening is formed in the outer wall of the upper end of the first oil pipe; the second oil pipe is arranged in the first oil pipe; an annular structure is formed between the second oil pipe and the first oil pipe; one end of the adapter pup joint is connected with the lower end of the second oil pipe; the speed governor assembly comprises a speed governor mandrel; one end of the speed governor mandrel is coaxially connected with the other end of the adapter pup joint; the speed governor mandrel can rotate relative to the adapter pup joint; the spray nozzle body is fixedly connected with the other end of the speed governor mandrel; a plurality of spray nozzles arranged at intervals are arranged on the spray nozzle body; the spray nozzle body can drive the speed governor mandrel to rotate; and the turbulence sheet is fixedly arranged on the periphery of the spray nozzle body and is positioned at the downstream position of the plurality of spray nozzles. The dragging and restraining type sand washing pipe string for the horizontal well provided by the embodiment of the invention has the beneficial effects that an impact damage effect can be achieved on sand at the bottom of the horizontal section of the horizontal well, and at the same time, sand-containing sand washing liquid can be brought back to the position above the horizontal section.

Description

technical field [0001] The invention relates to the technical field of oil production engineering, in particular to a horizontal well dragging type sand washing pipe string. Background technique [0002] As horizontal wells play more and more roles in the field of crude oil production, sand production in horizontal wells is an inevitable production problem. Sand control and sand washing treatment for horizontal wells are commonly used in engineering. Existing sand washing nibs are all designed for sand washing in vertical wells, and there is no special sand washing nib for horizontal wells. The horizontal section of the horizontal well is long, and the sand body usually gathers in the lower half of the reservoir casing. The conventional sand washing pen tip can only effectively wash out the sand in front of the common pen tip, but the sand washing effect on the lower part of the horizontal section is not very effective. Ideally, the sand can only be flushed when a certain p...

AI Technical Summary

Problems solved by technology

The horizontal section of the horizontal well is long, and the sand body usually gathers in the lower half of the reservoir casing. The conventional sand washing pen tip can only effectively wash out the sand in front of the common pen tip, but the sand washing effect on the lower part of the horizontal section is not very effective. Ideally, the sand can only be flushed when a certain pressure is built up, and most of the sand weight will be pushed back into the formation, and then returned to the inside of the casing during the oil production stage, which is very unfavorable to production. special sand flushing string

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