A speed-limited pulse nozzle for well washing

Abstract

The invention relates to a revolving speed limiting impulse sprinkler for cleanout of a petroleum and gas well. The revolving speed limiting impulse sprinkler can perform self rotation, controls the rotating speed within a certain range, and generates an impulse jet. The revolving speed limiting impulse sprinkler is characterized in that a center pipe is connected with the upper section of an end cover by a thread; a friction wheel assembly is arranged between the upper section of an upper connector and the interior of the middle section of the end cover; the upper connector is connected with the friction wheel assembly through a pin; a cylindrical roller bearing is arranged between the middle section of the upper connector and the center pipe; a middle connector is respectively connected with the upper connector and a lower connector by threads; either the upper connector or the lower connector is provided with three rows of holes for spray nozzles with different jetting directions to be welded; the lower connector is connected with a bottom connector through a thread; the center pipe is connected with a base by a thread; a thrust ball bearing is arranged between the base and the lower connector; three holes are formed in the bottom connector, and are used for three spray nozzles to be welded. The revolving speed limiting impulse sprinkler can be controlled to perform self rotate at the revolving speed with a certain range, and generates the impulse jet, effectively cleans attachments on the wall of the well, and is arranged on a down-hole string when in use.

Description

technical field [0001] The invention relates to a speed-limited pulse nozzle for well washing, which is installed on the joint at the bottom of the downhole pipe string during operation, and is used for washing sand bridges, rust, paraffin and other attachments on the well wall, and belongs to the oil and gas well production process. Downhole tools used in the well cleaning process of well workover operations. Background technique [0002] A large number of production wells in China have entered the middle and late stages of oil production, and sand production, pipe wall rust, and wax deposition are serious, which greatly restricts the extraction efficiency and production cost of crude oil. However, in the actual application process, the downhole supporting tools in the well cleaning process of the workover operation are still relatively scarce, so it is more and more important to develop a nozzle with good cleaning effect on the well wall. [0003] Through a large number o...

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Problems solved by technology

However, in the actual application process, the downhole matching tools in the well cleaning process of workover operations are still relatively scarce, so it is more and more important to develop a nozzle with good cleaning effect on the well wall.

[0003] Through a large number of patents and literature research, it is found that many nozzles used in oil and gas well flushing operations today do not have the function of self-rotation. At present, some engineers and technicians have developed several self-rotation nozzles, such as the self-rotation patent No. 201220722041.8 The well-flushing nozzle realizes the function of hydraulically driven self-rotation by setting a special flow channel, but it does not solve the function of controlling the speed; the patent No. 201120011251.1 is a water-powered self-rotating nozzle for well-flushing by setting nozzles flowing in different directions. In order to drive the self-rotation function of the nozzle by water power, the friction block set in its internal structure controls the speed to a certain extent through friction. However, the friction block is single, and the effect of controlling the speed needs to be studied. Constantly reduced cleaning effect

[0004] Based on the existing research data, the current well-washing nozzles mainly have the following problems: (1) There is a lack of types of self-rotating nozzles, and the rotation speed of some self-rotating nozzles is too fast or too slow, and the friction device installed cannot be effective. Control the rotational speed within a certain range; (2) The flushing strength of the sprayed well flushing fluid is not high, and cannot effectively clean the well wall attachments; (3) The flushing area of ​​the nozzle is not large, which seriously affects the well flushing efficiency

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