The International Society for Trenchless Technology

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Total: 41 results found.

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1. Bentonite
A natural clay material having thixotropic properties which is used as a basic ingredient for drilling muds and lubricants. ...
2. Detergent
One of several drilling fluid additives that reduces clay balling and keeps tooling clean. ...
See Horizontal Directional Drilling (HDD) ...
Mud motors and mechanical downhole motors used primarily to excavate hard soils and rock.
5. Drill Rig
A trenchless machine that installs pipes and cables by drilling a pilot bore to establish the location of the underground utility before enlarging the hole if needed and pulling back the product. ...
6. Drill Rods
High strength hollow steel pipes joined to form a string used to transmit rotational torque and thrust, and to transport drilling fluid from the drill rig to the downhole tools. ...
7. Drilling Fluid
Largely comprised of water, drilling fluids usually include bentonite and if warranted other additives such as soda ash, polymers, and detergents to address water and soils properties that could compromise ...
8. Dry Bore
Method of creating a bore without the use of a drilling fluid. Usually associated with guided impact moling, but may also apply to some rotary methods. ...
... drilling fluid or slurry. ...
10. Filter Cake
A thin layer of bentonite drilling fluid that seals the borehole preventing the flow of liquids from the borehole into the native soil. ...
11. Fluid Assisted
Method of guided drilling using a combination of mechanical drilling and Boring/Drilling pressurised fluid jets to provide the soil cutting action. ...
12. Gel Strength
The measure of electrical attractive forces of the drilling fluid that allows the drilling fluid to suspend drilled solids as they are transported by the slurry out of the bore hole. ...
Method for the installation of pipes, conduits and cables using a surface-launched drilling rig. A pilot bore is drilled using a rotating drill string and is then enlarged by a back reamer to the size ...
14. Hydrofracture
The inadvertent loss of drilling fluid from the borehole annulus to the surrounding soil as a result of excess downhole fluid pressure. ...
15. Intersect Method
Horizontial directional drilling method that allows accurate installation over longer distances than can be achieved by conventional means. The Intersect method employs two rigs starting from opposite ...
Instrumentation in a bore that provides continuous data simultaneously with drilling operations, usually transmitting to a display at or near the drilling rig. ...
17. Mixing Sytem
A system of pumps, hoppers, venturi mixers, hoses and tanks used to create the proper drilling fluid mixture suitable for the local geological conditions. ...
18. Mud Motor
Downhole tool for drilling in rock using pressurized fluid to power rotating cutterheads.  ...
19. Mud Weight
The weight of the drilling fluid measured against the weight of water used to determine the solids content of the fluid or slurry. Excess solids can adversely affect the efficiency of the drilling system ...
20. Pilot Bore
First, usually steerable, pass of any boring operation which later requires back-reaming or other enlargement. Most commonly applied to guided drilling, directional drilling and 2-pass microtunnelling ...
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