6. Application and Analysis
(1) Sand Prediction
Sand prediction based on the methodofsand index. According to the relationship of elastic modulus, sand producing index formula is: BULK = K +4 / 3G.
In the formula: BULK: sand index, K:Bulk modulus of elasticity, G: shear modulus.
The larger is BULK value, the greater is the rock strength and the better is rock stability, and the more difficult is sandproducing. If sand index (British unit) is not greater than 2e4MPa, then there is no sand; if sand index is less than 1.4e4MPa, then there is a great quantity of sand; if sand index is between 1.4e4MP and 2e4MPa, then there is a small quantity of sand.