Hydraulic double-acting drilling reamer

Abstract

The invention relates to a drilling hole reamer with hydraulic double effect used in well drilling of petroleum and natural gas, comprising a central tube, a body, a knife wing, a valve flake, a spring, a bend, a nozzle, a sealing ring, a crank and a cutting teeth. The body is connected with a drill stem by a thread connection. The technical proposal is that: the knife is embedded outside the body and is connected with the body by a pin roll connection; the central tube is arranged in the body; an overflow opening and the valve flake are arranged in the central tube and connected together by a spring. Under normal displacement work condition, overflowing area between the valve flake and the overflowing opening is large; the overflowing area is reduced when the displacement is enlarged andthe central tube is driven to downlink by differential pressure, and the knife wing is open to work by the crank arranged on the knife wing, at the moment the cutting tooth is cleaned by partial slurry passing through the bend; when the displacement is reduced, the central tube is driven to uplink by thrust of the bottom spring and then the knife wing is reset. The drilling hole reamer with hydraulic double effect used in well drilling of petroleum and natural gas has the advantages of simple structure, high functional reliability, less loss of pressure consumption, balance load of the knife wing, usage along with the drilling or the single and usage in well drilling construction of a bore hole wall with reducing diameter, collapsing block or blocking well condition.

Description

technical field [0001] The invention relates to a hydraulic double-acting drilling reamer used in oil and gas drilling, and is especially suitable for the hydraulic double-acting drilling reamer under the conditions that the well wall is easy to shrink in diameter, collapse or even block the well during drilling. Background technique [0002] In some formations (such as mudstone), due to the nature of the rock itself, in-situ stress and mud immersion, complex situations such as slippage may occur in the formation, and the diameter of the wellbore is likely to shrink, and the wellbore wall is prone to collapse and collapse. If the diameter of the newly drilled hole shrinks or collapses, it will be difficult for the drill bit and drill string to run in again; if the collapse occurs on the drill bit or the stabilizer, it may lead to the inability to pull out the drill, and finally it has to be undocked, discarded and stuck Drilling tools and stuck pipe often show that the torqu...

AI Technical Summary

Problems solved by technology

However, the current domestic reamers are still immature, with low work safety, and cannot effectively complete the reaming operation.

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