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Different Drilling Methods For Different Rock Layers

Mar. 22, 2019

We know that underground rock formations cannot be the same. Some are soft and a bit hard. According to this situation, we have to change the drilling machine and the drilling method. Let's take a detailed breakdown of the subterranean formation and the corresponding drilling method.

Salt formation: It is a water-soluble formation that is relatively soft. However, the drilling machine is easy to stick to the mud, and the drilled hole is also easy to fall off the mud or even collapse.

Mud-adhesive layer, shale: It is a water-sensitive formation. The drill bit is easy to form a mud pack, and the drilled hole is generally super-path.

Sand, gravel, loosely fractured formation: It is a loose porous formation that is prone to water leakage and sand leakage.

High-pressure oil and gas well formation: oil, natural gas, etc. are stored in the underground layer, which is easy to blow out, causing serious consequences.

High-temperature stratum: the stratum encountered in geothermal wells and ultra-deep wells, the mud treatment agent fails, and the formation is unstable.

Due to the complex situation of the formation, we must be clear when drilling.

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