ISBN: 9787502089917 - key technologies for safe and scientific drilling in soft coal seams(chinese edition) (1 resultados)

paperback. Condición: New. Language:Chinese.Paperback. Pub Date: 2023-09 Publisher: Coal Industry Press: This book systematically expounds the relevant basic theories and the latest research results in recent years. Focusing on the problem of drilling slag removal. it studies the main factors affecting drilling slag removal. the blockage mechanism of drill cuttings migration. and the time effect of borehole blockage; it proposes two efficient slag removal drilling methods: resistance reduction and drainage and pressure.…