‌Solution for Problematic Formations with High Clay Content

1‌.Problematic Formations with High Clay Content‌

The clay minerals in these formations are primarily composed of montmorillonite or a mix of illite-montmorillonite, with low diagenetic degree. These formations are prone to swelling upon water absorption and have strong slurry-forming properties, leading to issues such as hole shrinkage and collapse, making it difficult to control the solid phase of the mud.

2.‌Issues Encountered during Drilling‌

Severe slurry formation, making it difficult to reduce mud viscosity

3.‌Treatment Measures‌

(1) Utilize solid control equipment to control the solid phase

(2) Add viscosity reducers to control mud viscosity

(3) Replace part of the mud