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How to reduce local stress concentration through structural design of non-magnetic drill collars

release time：2025-07-16

source： network

1. Firstly, optimize the drilling tool assembly by replacing non-magnetic drill collars with non-magnetic pressure bearing drill rods in the bottom drilling tools of deep wells, increasing the flexibility of the drilling tools and reducing downhole wear resistance.
2. Avoid using the root of the transition cone angle of the drill collar from the forging core (with coarse grains and low hardness) to prevent stress concentration and fracture caused by the formation of annular wear grooves.
3. Add protective sleeves and buffer structures, install wear-resistant protective sleeves (such as hard alloy sleeves) and buffer damping sleeves, isolate the drill collar body from direct contact with the wellbore wall, absorb drilling impact force, and extend service life.
4. The new "drilling teeth+drilling auger" structure reduces the collision damage of the auger by crushing stones, while the buffer sleeve reduces impact fatigue.

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What are the aspects of material optimization for non-magnetic drill collars

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What are the aspects of material optimization for non-magnetic drill collars

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