The crushing of the bolt rod or the hole wall is also a main failure mode, especially when the material strength of the joint is low, and the design criterion is that the crushing stress ep of the bolt rod or the hole wall is smaller than The probability of the compressive strength Sb of its corresponding material must be greater than or equal to the reliability required by the design. R(t) is expressed as: P(ep Determine the stress distribution of the bolt: Lmin should be as large as possible, so that the pressing stress ep is reduced; but if Lmin is too large, the force on the joint surface will be uneven due to manufacturing errors. In order to ensure a certain compression strength of the joint, the design should be such that the dimension Lmin is (0.75 ~ 1.5) d. Take Lmin = 1.25d, ep = FmdLmin = F1.25md2. Standard deviation eσp = 11.25me2Fd4 4F2e2dd61/2, , eF=0.06F. Apply the coupling equation to solve the bolt diameter d. Joining equation: Z=-Sb-epσ2Sb e2ep. According to the reliability R(t) value required for the bolt connection, the standard normal distribution table is checked, and the Z value of the coupling coefficient is obtained. Substituting the relevant parameters Z, eSb, eσp, Sb, and eb into the above formula to obtain the bolt diameter d, and checking the thread standard to determine the nominal diameter of the bolt d.
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
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.
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
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