Based on the fissure development characteristics of
expansive soils, water well drilling rig.borehole wall stability requires dual measures of “anti-swelling + anti-shrinkage”:
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Chemical borehole protection:
Inject sodium silicate solution (modulus 3.2) to react with clay and form a waterproof film.
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Physical support:
Use double-layer casings (outer protective casing + inner screen pipe), filling expansion water-stop strips in the gap.
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Humidity control:
Circulate low-temperature mud (10–15℃) in the hole to reduce water migration.water well drilling rig
Bangxin drilling rig