Repeatable bypass valve

Abstract

The invention relates to a bypass valve capable of repeating switch, including a valve body and a valve core capable of sliding in the valve body. The valve body is formed through a valve core to form an axial through main flow passage, where the valve body is provided with a bypass passage and an inner ring groove in the axial direction of the valve body. The bypass passage is formed when the bypass passage is communicated with the main flow passage through the connection passage, and the through flow passage is formed when the inner ring groove is communicated with the main flow passage through the connection passage. The valve body is also provided with a reset mechanism which is connected to the valve body and that positions the valve body at the time of opening the bypass flow passage and through the flow passage. The bypass valve can greatly improve the stability of the bypass operation and the straight-through operation, and realize the cycle switching between the multi-pass operation and the straight-through operation. It also has the advantages of fast plugging and high sand removal efficiency, and can greatly improve the drilling efficiency.

Description

technical field [0001] The invention relates to an oil / natural gas drilling tool, in particular to a bypass valve which can be switched repeatedly. Background technique [0002] In drilling engineering, the problems of lost circulation and sand settling in the horizontal section of horizontal wells are usually encountered. Among them, lost circulation refers to the occurrence of mud leakage during the drilling process, which will not only seriously endanger the safety of drilling operations, but also greatly interfere with the normal drilling, and even cause the wellbore to be scrapped, causing major Economic losses. Sand settling in the horizontal section of a horizontal well means that during the drilling of the horizontal section of a horizontal well, due to the limited sand-carrying capacity of the mud and the self-weight of the drilling mud, a cuttings layer will often be formed at the bottom of the horizontal section. The accumulation will eventually cause sticking a...

AI Technical Summary

Problems solved by technology

[0005] 1. The structure is complex, which leads to a long basket length of the bypass valve, which greatly limits the number of times the bypass valve can be opened / closed repeatedly;

[0006] 2. Taking the oil well circulation sub as an example, this tool is expensive and will greatly increase the cost of drilling operations (especially in shallow and medium wells) when used;

[0007] 3. Due to the large fluctuation of drilling pump pressure (the fluctuation of pump pressure is usually within 10MPa, when the depth of the oil well is deep, the fluctuation of pump pressure often exceeds 10MPa), and when the fluctuation of pump pressure is 3-5MPa, it will It will cause the working state of the bypass valve to change, so that the bypass valve cannot perform stable bypass operation when it is used, especially when it is used in a deep well.

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