Introduction to trenchless horizontal directional drilling III

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Introduction to trenchless horizontal directional drilling III

Feb 10, 2025

Introduction to trenchless horizontal directional drilling III

Definition and proportioning parameters of mud

Definition of mud: trenchless mud refers to the addition of a certain proportion of clean water with a PH value of 8 to 9

A mixture of bentonite and other chemical agents having a certain bulk weight and viscosity. The grading parameters of the mud: the ratio of bentonite and other chemical agents is generally 4% to 6%, and the bulk weight is between 1.05 and 1.2. In different soil layers, the mix, bulk density and concentration of mud are all different. Understanding the soil layer and ratio is of great guiding significance for trenchless mud treatment and pulping. The commonly used ratio is as follows:

Soil layer: clay;

Mud ratio: Bentonite 1: soda ash 0.04: fluid loss reducer 0.06: lubricant 0.06;

Slurry characteristics: bulk density: 1.05~1.07; Viscosity: 35~40 "; PH: 8.5~9; Water loss: 4~7ml;

Soil layer: sand layer;

Slurry ratio: Bentonite 1: polymer 0.05: lubricant 0.06;

Slurry characteristics: bulk weight: 1.05; Viscosity: 50~65 "; PH: 8.5~9; Water loss: 4~5ml;

Soil layer: pebble layer;

Slurry ratio: Bentonite 1: polymer 0.03: fluid loss control agent 0.04: lubricant 0.03;

Slurry characteristics: bulk density: 1.05~1.10; Viscosity: 60~70 "; PH: 8.5~9; Water loss: 4~5ml;

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