Redressing-while-drilling machine for drilling engineering and redressing method

Abstract

The invention discloses a redressing-while-drilling machine for drilling engineering. The redressing-while-drilling machine for drilling engineering comprises a cylinder body and three spiral-shaped blade wings, the three blade wings are evenly fixed to the cylinder body. The blade wings comprise blade wing bodies, PDC clad sheet cutting teeth and gauge protection flat teeth. Every blade wing bodies is evenly provided with 13-17 PDC clad sheet cutting teeth, and the gauge protection portions of the blade wing bodies are evenly provided with the gauge protection flat teeth. The redressing-while-drilling machine for drilling engineering is simple in structure, redressing while drilling is performed by using the redressing-while-drilling machine, the well wall can be cleaned and scraped whiledrilling, so that the well wall can be corrected, the redressing effect is improved, hole shrinkage is eliminated and a mould bed is cleaned, and the size of a hole diameter is ensured. The redressing machine can change the flow field of drilling fluid in a well, rotational flow upwards going of the drilling fluid and rock debris is facilitated, and the sand-carrying capacity of the drilling fluid is improved.

Description

technical field [0001] The invention relates to the technical field of downhole tools for drilling engineering, in particular to a reamer while drilling and a reaming method for drilling engineering. Background technique [0002] There are many complex formations in the Beibu Gulf Basin in the western part of the South China Sea. During the drilling process, the formations are unstable. The wellbore is easy to neck down and the size of the wellbore becomes smaller. It is prone to complicated situations such as lost circulation and collapse. During the operation of exploration wells and development wells in the early stage, there were many situations where tripping, casing running, and electrical testing encountered resistance and jamming. A large set of sand-shale interbeds appeared in the section, and multiple well drillings were required in the follow-up, which seriously affected the drilling efficiency. Contents of the invention [0003] The object of the present inve...

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Problems solved by technology

[0002] There are many complex formations in the Beibu Gulf Basin in the western part of the South China Sea. During the drilling process, the formations are unstable. The wellbore is easy to neck down and the size of the wellbore becomes smaller. Prone to complex situations such as lost circulation and collapse

During the operation of exploration wells and development wells in the early stage, there were many situations where tripping, casing running, and electrical testing encountered resistance and jamming. A large set of sand-mudstone interbeds in the section requires multiple well drilling, which seriously affects the drilling efficiency

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