Hole wall trimming tool for micro-reaming while drilling and its application method

Abstract

The invention discloses a while-drilling micro-bore-enlarging well wall trimming tool and a using method thereof. The trimming tool comprises a cylindrical body, a plurality of centralizing belts arranged on the surface of the cylindrical body, and cutting teeth. The cylindrical body can be connected to a drill collar and rotate along with rotation of the drill collar. Every two centralizing belts are parallel, and each centralizing belt is spirally arranged on the surface of the body in a protruding mode. The upper and lower ends of the centralizing belts are in arc transition with the body. Hard alloy layers are arranged at the bottoms of the centralizing belts, the cutting teeth are inlaid in the area, with the hard alloy layer, of one centralizing belt in the longitudinal direction, and the diameter of the part with the cutting teeth is larger than that of a drill bit. In the use process, the trimming tool is installed on the drill collar on the upper side of the drill bit and can automatically trim well wall micro-steps and irregular well sections and perform micro-enlarging on a wellbore in the normal drilling process, the diameter of the enlarged wellbore is larger than that of the drill bit, a casing pipe can be lowered without drilling-down or pigging, and thus drilling time is shortened.

Description

technical field [0001] The invention relates to the field of drilling, in particular to a micro-reaming well wall trimming tool while drilling and a use method thereof. Background technique [0002] In drilling such as air drilling, due to the drill bit and the formation, when the hole is re-entered after tripping, there is more or less the problem of difficult re-entry of the drill collar. Especially in the process of coalbed methane development, due to the poor drillability of the upper strata and serious leakage problems, air drilling technology was adopted; It is necessary to drill separately in the next trip, and use a drill bit with a stabilizer to pass through the well, which not only increases the workload of the well team, but also causes serious wear and tear on the stabilizer after the completion of the well pass, and even causes the stabilizer to be scrapped. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the prese...

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Problems solved by technology

[0002] In drilling such as air drilling, due to the drill bit and the formation, when reentrying the wellbore after tripping, there is more or less the problem of difficult reentry of drill collars

Especially in the process of coalbed methane development, due to the poor drillability of the upper strata and serious leakage problems, air drilling technology was adopted; It is necessary to drill separately in the next trip, and use the drill bit with a stabilizer to pass the well, which not only increases the workload of the well team, but also the stabilizer is seriously worn after the completion of the well, and even causes the stabilizer to be scrapped

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