An oil well forward and reverse sand flushing nozzle

Abstract

The invention provides a forward and reverse sand washing jet nozzle for an oil well. The forward and reverse sand flushing jet nozzle comprises a tubular sand washing body and a core pipe, wherein an annular portion is arranged in a front port of the sand washing body, multiple hole passages are evenly distributed in the annular portion along the peripheral direction and axially run though the annular portion in the axial direction of the sand washing body, and jet nozzle bodies are embedded and fixed in the hole passages. The core pipe is located in the sand washing body, an annular cavity communicated with the jet nozzle bodies is formed between the core pipe and the sand washing body, the front end of the core pipe is connected with the annular portion, a stopping part is arranged at the position of a port at the rear end, a ball seat is annularly formed on the inner surface of the core pipe, multiple channels are evenly distributed on the side wall of the ball seat, adjacent to the rear side of the ball seat and correspondingly communicated with the annular cavity and the inner cavity of the core pipe, and a valve ball capable of correspondingly setting the ball seat is additionally arranged in the core pipe and can be movably arranged between the ball seat and the stopping part. The forward and reverse sand washing jet nozzle is good in sand washing capacity and high in sand discharge speed and has forward sand washing and reverse sand discharge functions, and sand washing and discharge operation can be achieved by tripping the forward and reverse sand washing jet nozzle in a next tubular column.

Description

technical field [0001] The invention belongs to the field of oil exploitation, and in particular relates to a sand washing nozzle used for oil well maintenance in the oil extraction technology, in particular to an oil well forward and reverse sand washing nozzle. Background technique [0002] At present, whether it is a vertical well, a horizontal well, or a well with sand fracturing and stimulation measures, due to time and process reasons, sand buried oil layers are common in oil wells. Some oil wells are sanded under the action of liquid column compaction, and the sand surface will collapse. A solid sand cap is formed, which affects the normal production of oil wells and requires sand washing. [0003] The conventional sand washing method is to install a nib at the lower end of the 73mm tubing, and the sand washing fluid is sprayed from the nib to the sand surface to suspend the sand and move it out of the wellbore by utilizing the carrying capacity of the fluid. This me...

AI Technical Summary

Problems solved by technology

For example, a Chinese patent application titled "Multi-directional jet sand washer" (application number: 201210252865.8) provides a multi-directional jet sand washer, including a sand washer body and a nozzle, and the end of the sand washer body There are several circulating holes on the outer peripheral surface of the pump, and nozzles are installed on the circulating holes, which have the advantages of simple structure, convenient processing, low cost, practical and reliable, and convenient operation; the disadvantage is that sand is discharged from the annular space between the tubing and the casing. For the 177.8mm casing, the annular space is large, the drainage speed is low, and the ability to carry sand is poor

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