Reamer

Abstract

The invention discloses a reamer. The reamer comprises an outer cylinder, a blade mechanism, a transmission shaft mechanism and a reset mechanism, wherein the transmission shaft mechanism is arranged in the outer cylinder and axially slides along the outer cylinder, and the reset mechanism is used for resetting the transmission shaft mechanism; a first sealing structure matched and sealed with the outer wall of the transmission shaft mechanism is arranged at the upper end of the outer cylinder, a blade groove is formed in the lower end of the outer cylinder, a second sealing structure is arranged at the end part of the outer cylinder, and the blade mechanism is arranged in the blade groove; and an expander for driving the blade mechanism to expand outwards is arranged on the transmission shaft mechanism, and the inner cavity of the transmission shaft mechanism is communicated with the blade groove. The reamer has contractility and cannot be limited by the wall thickness of a tool body, the reaming size is large, and meanwhile, the sealing structure is reasonable; and in the drilling process, the drilling fluid hardly enters key components of the reamer in the processes of expansion and contraction of a reaming blade, and the flexibility of the blade cannot be influenced.

Description

technical field [0001] The invention relates to a downhole reaming tool for drilling, in particular to a reamer for reaming operations in the drilling process, which is used in oil and gas drilling technology and belongs to the technical field of design and manufacture of downhole tools. Background technique [0002] In the process of oil and gas drilling operations, for the convenience of running casing, or when drilling into formations that are easy to shrink in diameter, the drilled wellbore often has different degrees of diameter reduction. In this case, it is necessary to The borehole is enlarged to a larger diameter borehole. As oil and gas drilling shifts to deep wells, ultra-deep wells, and high-pressure oil and gas wells, drilling is facing more and more problems. As an important means to deal with drilling abnormalities, hole reaming technology is also developing continuously. It can not only be used as a simple tool to expand the wellbore, but also can be used as...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned prior art can complete specific hole reaming tasks, but there are still the following deficiencies: 1. During the drilling process, the expansion and contraction of the reaming blades can easily cause drilling fluid to easily enter the joint parts of the reaming body, affecting the flexibility of the blades The reamer of the fixed wing is limited by the wall thickness of the tool body, so the size of the reamer is small, and it can expand the pilot hole by about 25% at most, which cannot fully meet the needs

2. The diameter of the reaming device cannot be appropriately enlarged according to the needs, and the use of the reamer is relatively limited.

3. The sealing structure is unreasonable. During the drilling process, the drilling fluid easily enters the joint parts of the reaming body during the expansion and contraction of the reaming blade, which affects the flexibility of the reaming blade.

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