Rotary well washing tool with liquid damping deceleration device

Abstract

The invention provides a rotary well washing tool with a liquid damping deceleration device. The rotary well washing tool comprises a main cylinder, a liquid damping deceleration assembly, a lower core shaft, a bearing, a lower connector, a spray head and a nozzle, and used for treating oil dirt, wax dirt, rust dirt or salt dirt and matters attached to the inner wall of an oil-gas well productionpipe column. The rotary well washing tool provided by the invention has the beneficial effects that on the one hand, the principle of momentum conservation is utilized and the eccentric nozzle is mounted on the spray head, so that the axial, radial and circumferential three-dimensional speed can be generated when a fluid flows out of the spray head, and the spray head can be driven by the circumferential counterforce of the fluid on the spray head to rotate; and on the other hand, the circumferential liquid resistance is generated by a damping device, which is coaxially mounted with the sprayhead, through the liquid interaction when the spray head rotates, so that the rotating speed of the spray head can be reduced, the spray head can be prevented from rotating too fast, a certain periodof residence time for liquid flow during the pipe wall washing process can be guaranteed, and then the optimal washing effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of downhole tools for oil and natural gas drilling engineering, and in particular relates to a rotary well cleaning tool which can control the rotation speed through liquid damping during the well cleaning operation. Background technique [0002] In the production process of oil and gas wells and water injection wells, problems such as sand production, scaling, and wax formation often occur in the formation. In addition, sand plugging and sand sticking occur in well completion, workover and other operations. At present, the coiled tubing sand flushing operation has become the most basic application of on-site construction, and it is also an indispensable and important link in various complex operations. Well cleaning operations are mainly used to deal with the oil, wax, rust or salt scales attached to the inner wall of the production string of oil and gas wells. Combining coiled tubing and high-pressure wat...

AI Technical Summary

Problems solved by technology

The self-rotating nozzle is essentially a rotating nozzle tool, which differs from the patent CN107747484A (a high-pressure hydraulic rotating jet well flushing device) in that the tool is equipped with a frictional speed-limiting mechanism inside, which overcomes the excessive speed and cannot Disadvantages of ensuring the residence time of the flushing fluid on the pipe wall

However, the modified patent has three disadvantages of simply limiting the speed through friction braking: the friction force is fixed, and cannot be automatically adjusted according to the pressure and flow rate of the fluid in the pipe string, and the applicable range is narrow; the friction force comes from the sleeve and The heat generated by the friction block cannot be discharged in time, which will inevitably lead to thermal wear of the sleeve and the friction block. On the one hand, both the sleeve and the friction block become wearing parts, which greatly reduces the service life of the tool and increases the cost of use and maintenance. Difficulty; on the other hand, when the sleeve and / or friction block wear to a certain extent, the friction between them will be lower than the preset value, so that the working performance of the tool cannot be guaranteed

[0006] As a rotary flushing well tool, the above two patents provide some valuable design ideas, but they have great defects in speed control, speed self-regulation and reliability, and cannot be realized on the basis of speed-limited standing flow. The automatic adjustment of the speed makes it difficult to maximize the effect of the flushing well of the tool

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