Drilling formation

Release time:

2024-09-11

The object of drilling operation is rock. From the perspective of drilling construction, rock can be divided into three basic categories: hard rock formation, soft rock formation and non hard rock formation.

 

hard rock formation

 

 

Hard rock formation usually refers to the solid rock (including: andesite, quartzite, granite, gneiss, basalt, skarn, silicified limestone, rhyolite, diorite and jasper rock, etc.).

 

soft rock formation

 

 

Soft rock formation usually refers to the cementitious rock (including cementitious sandstone, calcareous limestone, mudstone and weathered rock), which is easy to expand in volume under wet condition, resulting in hole wall shrinkage.

There are two typical formations: dense mudstone formation and elastoplastic mudstone formation.

 

non-hard rock formation

 

 

Non-hard rock formation usually refers to loose rock, which is formed by non-cohesive formation (including soil layer, sandstone and pebble rock). During drilling, the hole wall must be strengthened to prevent collapse.

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