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Revolving speed limiting impulse sprinkler for well cleanout

A speed-limited, pulsed technology, which is used in wellbore flushing, wellbore/well components, earth-moving drilling, etc., to solve problems such as the inability of the friction device to effectively control the rotational speed, the single friction block, and the reduced well-flushing effect.

Inactive Publication Date: 2015-08-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual application process, the downhole supporting 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. Continuous action, reducing the 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 rotation speed within a certain range; (2) The flushing strength of the sprayed well flushing fluid is not high, and cannot effectively clean the attachments on the well wall; (3) The flushing area of ​​the nozzle is not large, which seriously affects the well flushing efficiency

Method used

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  • Revolving speed limiting impulse sprinkler for well cleanout
  • Revolving speed limiting impulse sprinkler for well cleanout
  • Revolving speed limiting impulse sprinkler for well cleanout

Examples

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Embodiment 1

[0018] Embodiment 1: Taking the 160mm type pulse nozzle with limited rotation speed for well washing as an example, it will be further described in detail.

[0019] refer to figure 1 . The 160mm type limited-speed pulse nozzle for well washing is a kind of 5 / 8"For oil and gas wells with casings of the type above and above, it is installed on the joint at the bottom of the downhole pipe string during well cleaning operations. The nozzle can effectively control the rotation speed within a certain range and generate pulsed jets to remove the sand on the well pipe wall. Bridge, rust, paraffin and other attachments, to achieve normal and efficient well cleaning operations. Mainly composed of center pipe 1, end cover 2, friction wheel assembly 3, pin 4, upper joint 5, nozzle A6, middle joint 7, lower joint 8, seat 9, bottom joint 10, nozzle B11, O-shaped rubber seal ring A12, thrust ball bearing 13, O-type rubber seal ring B14, O-type rubber seal ring C15, shaft elastic retaini...

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PUM

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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 workover operations are 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00
CPCE21B21/00E21B41/0078
Inventor 蒋发光卓昌荣梁政张佳佳刘晓宁谢帅谭晓波李贞丽张伟张敏
Owner SOUTHWEST PETROLEUM UNIV
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