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Water well Hole Opener , steel tooth cones hole opener ,hole opener withTCI Tricone Bit cutters, tricone bit legs hole opener, hole opener bits,expanding hole opener features 

Drillers always drill a smaller hole at first, then enlarger it with hole opener, it is a type of regular drilling technology when the drilling machine is lower power or the end-hole is too big

We can make the hole opener and solutions according to the hardness of rocks, drilling depth, size of pilot hole, size of end-hole

If fix the tricone bits as the pilot bits, the hole opener will be a rock bits, hole opener with tricone bits as pilot bits is always applicable in special sizes well drilling .The reamer mainly consists of four or more cones

Cutting structure with premium tungsten carbide hard facing or premium tungsten carbide insert of formulas and new techniques is utilized, and increases wear-resistant capability of reamer

Water Wells Hole Opener Operational Considerations
Drilling Weight - The choice of drilling weight is determined based on the recommendations of the bit manufacturer and the number of cutters on the hole opener.
Number of Cutters - The number of cutters placed on a hole opener is governed by the following facts:

• Maximum number which will fit around the perimeter.
• The greater the number of cutters, the less the weight, which therefore reduces the penetration rate.
• In softer formations, less weight is needed to penetrate.
• The greater the number of cutters, the smoother the tool will run.
• The greater the number of cutters, the greater the cost.
• The greater the number of cutters, the longer the cutters will last

Rotary Speed - Maximum speed is determined by the manufacturer's recommendation and the calculation to account for the linear distance the cutter is moving per revolution.

Hole Cleaning - A frequently over looked point of hole opener operation is hole cleaning. The volume of cuttings to remove from a hole increase by a squared factor with an increase in hole diameter.

Roller Cone Bit hole opener parameters

Bite size		Bit type
Inch	mm
18	457.2	HA/HJ  117,127,217,517,537,617,637
20	508	HA/HJ  117,127,217,517,537,617,637
22	558.8	HA/HJ  117,127,217,517,537,617,637
24	609.6	HA/HJ  117,127,217,517,537,617,637
26	660.4	HA/HJ  117,127,217,517,537,617,637
28	711.2	HA/HJ  117,127,217,517,537,617,637
30	762.0	HA/HJ  117,127,217,517,537,617,637
32	812.8	HA/HJ  117,127,217,517,537,617,637
36	914.9	HA/HJ  117,127,217,517,537,617,63737
10-40 inch can be customized as customer`s requirements

Steel tooth cones hole opener picture 

TCI cones bit hole opener 

Water Wells Hole Opener

Water Wells Hole Opener,Oil Water Well Hole Opener,Oil Well Replaceable Hole Opener,Hole Opener For Water Well Drilling

Hejian Deris Petroleum Drilling Equipment Co.,Ltd. , http://www.welldrillingbit.com