Light Alloyed Drill Rods of Tool Joint’s Connection (LADR)
TC3668-708-01423949-03
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Light Alloyed Drill Rods of Tool joint’s Connection are designed for drilling wells Rods are made of aluminium alloy D16T, tool joints are made of steel – 40XН. The tool joints are connected to smooth rods with the using of the thread and a special glue. LADR are designed instead of Light Alloyed Drill Rods for Core Drilling with diameter 42 mm, 54mm and 68mm and in addition to rods SUDR.
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Table 7 – Mechanical properties of the drill rod’s body and the tool joint
Note: 1. Mechanical properties of the details’ material of tool joints are shown after the valuable thermal treatment Certificate of conformity № РОСС RU.АЯ36.В21767 from 15.05.2006 |
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Using of LADR in the operation provides:
more completely using of speed opportunities of
Light Alloyed Drill Rods are used on rigs which meet requirements given in Table 1. |
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LADR of Tool Joint’s Connection - Light Alloyed Drill Rods of the new generation – significantly exceeds domestic LADRCD
and foreign drill rods of the nipple joint:
- Owing to the construction features the durability on the bending LADR are higher in 35%, than LADRCD and foreign analogues;
- For detachable tool joint’s threads of LADR it is required almost less cycles in 2 times as compared with square threads of LADRCD till the whole screwing of the threading connection. The superficial durability of tool-joint’s threads is realized with the help of carrying out of the chemical-thermal treatment (carbonitration) at our plant completely excludes their defect because of jamming and wear;
- LADR are more effective in high-frequency drilling, predominantly in diamond way of drilling, and also
in correction of wells’ chassis and in directional drilling;
- LADR are produced of different dimensions: with diameter from 43mm up to 85 mm. with wall thickness from 7mm up to 9.5 mm and length from 0.7mm up to 6.2 m. The using of analogical outside diameters and detachable tool joints’ threads provides the complete interchangeability of LADR and SUDR. This fact lets to form different optimal cracker of drill column from SUDR and LADR.
For example, in drilling of wells in solid soils with bits, which have diameters 93 mm, with the depth of wells 200 and more meters it is important to install in the lower part of the column drill rods SUDR-85 with length 150m (for creation axial load up to 20 KiloNewton), and in the upper part – light alloyed LADR-85. It will be allowed to use the most high rotation frequencies, which can be saved on significant wells’ depths having the high safety of the drill column. Besides, the labour conditions of the drill crew will be lighted – during jostle operations there is no use to change elevators, drive-heads and keys of the rod’s turn and the labour of manual operations of the assistant driller significantly reduces owing to using LADR.
Examples of marking drill rods during creating the order
Drill rod durable (D) with diameter 55 mm, wall thickness 9 mm, with the length 4.7 m:
Rod D55 ´ 9.0 – 4.7 ТC 3668-708-01423949-03
The same for the drill rod with the left thread (LT):
Rod LT55 ´ 9.0 – 4.7 ТС 3668-708-01423949-03
