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Jetting Assemblies

Jetting assemblies are used to provide directional capabilities through alluvial soils. They allow the user to push the drill string resulting in a direction change due to the geometry of the assembly. Jetting assemblies usually require a number of components and are customized for the rig and project. The O.D. and thread connections of the components should match that of the rig and, when possible be standardized for other equipment owned by the contractor as well as that available from Horizontal Technology. This will minimize costs as well as down time. Horizontal Technology rents and sells complete assembly or the individual components. A standard jetting assembly;

When using a magnetic steering tool all components must be constructed from a material to avoid magnetic interference to the steering system. The non-mag orientation sub (C), sometimes called a mule-shoe sub houses the steering tool. A stainless steel, flow through, stinger slides into the rig side of the sub and is secured by set screws.

The steering tool is threaded onto the stainless steel stinger (B). The stinger is ported to allow drilling fluid to pass around the steering tool and through the drill bit. The non-mag collar or monel (A) slides over the steering tool and threads onto the orientation sub.

A bent sub (D), also made of non-magnetic material is threaded onto the orientation sub. The bent sub will have a specific degree of bend. The greater the bend the more steer-ability the assembly will have. This is also affected by the length of the bent sub and the diameter of the bit. One and three-quarter (1.75) is a common bend for jetting assemblies. Bits are equipped with threaded pins so bent subs will have a box connection on both ends.

When planning your jetting assembly it is a good idea to have the pin connection of the orientation sub the same thread as the box connection on the standard drill motor that would be used if rock were encountered. That will allow the user to unthread the bent sub and make up directly onto the motor without re-assembly of the steering tool.

A variety of bits can be used on jetting assemblies. The bit size should match what is commonly used with the size drill string and rig. Mill-tooth roller cone bits (F) are suggested. If harder formations are encountered the bearings in the bit will relieve torque and possibly prevent an over torque situation. The ability to rotate through harder layers is enhanced with a roller cone bit verses a bladed or spade bit.

Bit shims (E) are used to align the jet nozzles of the bit with the bend in the bet sub. If the bit is of a single center jet style, shims are not needed. Using the shims, some users will blank two jets and align the third with the bend; others will blank one nozzle and high-side the other two.

 

 





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