What are the treatment methods for leakage in horizontal directional drilling?

1. Adjust mud properties
Increasing the viscosity and specific gravity of the mud can be achieved by adding additives such as bentonite and polymers.
Improve the colloidal properties of the mud and enhance its plugging ability.
2. Intermittent drilling
Stop drilling and let the mud stand in the hole for a period of time to form a mud skin wall to reduce leakage.
3. Pour plugging materials
Pour cement slurry, water glass and other plugging materials into the hole.
The segmented pouring method can be used to gradually plug the leakage channel.
4. Change the drilling process
For example, follow-up drilling, that is, follow the casing while drilling to prevent mud leakage.
5. Adjust drilling parameters
Appropriately reduce the drilling speed and feed pressure to reduce the disturbance to the hole wall.
6. Backfill in the hole
Backfill the leaking part in the hole with clay, gravel and other materials, and drill again.
7. Perform local reinforcement
Perform local grouting reinforcement on the stratum in the leakage area to improve the stability and sealing of the stratum.
8. Use chemical plugging agents
Select targeted chemical plugging agents to quickly seal the leakage pores.