KINGWELL Stabilizer Features & Benefits:
 
 
KINGWELL Stabilizer Technical Data:
 

Bit Size (in)	Working OD (mm)	End OD of body(mm)	ID (mm)	Length (mm)	Thread code on both ends
					Drill string type		Near bit type
					Top	Down	Top	Down
6	152.2	121	51	1200	NC38			3 1/2 REG
6 1/4	158.7
6 1/2	165.1
7 1/2	190.5	159	57	1600	NC46			4 1/2 REG
7 7/8	200
8 3/8	212.7	159 165	71	1600 1800	NC46 NC50
8 1/2	215.2	159 165 178
8 3/4	222.2
9 1/2	241.3	178 197		1600	NC50	NC50	NC50
9 5/8	244.5			1800				6 5/8 REG
9 7/8	250.8
12 1/4	311.2	203 209	76	1800	NC56 6 5/8 REG	NC56 6 5/8 REG	NC56 6 5/8 REG	6 5/8 REG
16	406	229 241.3		2000 2200	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG	NC61 7 5/8 REG
17 1/2	444.5
24	609.6
26	660.4
28	711.2
Note: Stabilizer can be made according to customer's special requirement.

 

 
Non-magnetic Drill stabilizer technological regulation
1.Scope
    This regulation applies for the production,inspection and marketing of non-magnetic drill stabilizer from KINGWELL.
 This regulation includes technological requirements of non-magnetic drill stabilizer, test method, signal ,package, test certificate and quality control information.
 This regulation applies to the latest edition of API Spec 7 ,if there are conflicts, should take API Spec 7 shall prevail.
2.Technological requirements
2.1 Chemical composition
 sheet 1: Chemical composition(%)

C

Si

Mn

Cr

Ni

Mo

N

P

S

Al

Cu

Nb

≤ 0.08

≤ 1.0

18.0 - 22.0

13.0 - 17.0

1.0 - 3.0

0.4 - 0.75

0.28 - 0.46

≤ 0.03

≤ 0.01

≤ 0.025

≤ 0.20

≤ 0.10

Tolerance

±0.01

±0.05

±0.15

±0.15

±0.03

±0.03

±0.03

±0.005

±0.005

2.2 Mechanical property and Size requirements.
2.21Mechanical property should be up to sheet 2.
              Sheet 2 mechanical property               

Yield Strength  Rt(Mpa)	Tensile Strength  Rm(Mpa)	Elongation A(%)	Sharp V Impact Akv(J)	Hardness Brinell (HB)
≥758	≥827	≥18	≥75(longitudinal)	≥285

2.22 Magnetic property
The relative permeability for each drill stabilizer should be no more than 1.010 µr and the maximum deviation of uniform magnetic field should be no more than±0.05 µT. Inspection should use a magnetoscope and the probe for difference of magnetic fields. Magnetometer connected with the probe should be posited the axial direction of non-drill stabilizer and the difference of magnetic fields showed on the recording papertape should be a part of stabilizer inspection certificate, that's magnetic field gradient results.
2.23 Decay resistance
    Each non-magnetic drill stabilizer should pass the current edition of ASTM A282 E method of corrosion test.
2.24 Straightness accuracy
The maximum straightness for each non-drill stabilizer is 0.52mm/m.
2.25 Axiality
The maximum deviation for all the diameters should be no more than 1mm.
2.26 Difference in wall thickness
The full range wall thickness difference for each non-magnetic stabilizer should be less than or equal to nominal thickness 12%, or less than or equal to 4.78mm, smaller was be preferred.
2.27 Surface
The surface should be smooth and the surface quality defects burnish depth should comply with the regulation of API SPEC 7-1, inner hole should carry on the cold roller processing.
2.28 Size
    The sizes of stabilizer must be complied with relevant constracts. The OD,ID and varios size must be according to the drawing.
2.29 Ultrasonic Test
    Ultrasonic Test must be complied with the regulation of ASTM A388.
3.Test method and regulations
3.1 Mechanical Property
3.11
    Both of the tensile specimen and impact specimen should be sampled longitudinally at any end of the forging,It should be 25.4mm away from the surface  or in the center of the wall thickness, smaller will be preferred. It should be carried out in accordance with the column specimen of 0.2% conditioned yield point in ASTM A370. The impact specimen should be adopt the 10mm×10mm×55mm charpy V specimen, and the test temperature is 20℃±5℃.
3.12
    The hardness test should be complied with the requirements of ASTM A370.
Surface Hardness: Choose two points separately from work part ,two ends,cant and do test.
Subcutaneous quadrant hardness: Do corss-shaped test at two ends of stabilizer, which posited subcutaneous 1.5",1" and each quadrant three value measurement.
3.13
The supplier chooses two stabilizers and leaves 150mm sample length at any end for the buyer to get a sample of 30mm×30mm×150mm.
3.2 Non-magnetic Test
Each non-magnetic drill stabilizer should be carried on relative permeability test,the test method should be noted on the certificates.
3.3 Intergranular Corrosion Inspection
    Intergranular corrosion inspection must be complied with ASTM A262 E. Specimen sampling locates the axial from inner hole within 12.7 mm
3.4 Straightness measurement
   The offset between the centre line of the two ends of stabilizer and tube body.
3.5 Wall Thickness Test
    With Ultrasonic thickness gage do wall thickness test on the full range of non-magnetic drill stabilizer.
3.6 Ultrasonic Test
Each non-magnetic drill stabilizer should be carried on frull range Ultrasonic Test as per API SPEC 7-1.
3.7 Inner holes of each non-magnetic drill stabilizer should carry on the cold roller processing.
4. Signal
    Producer signal,Furnace number and Serial number should be marked on the end of each non-magnetic drill stabilizer.
5.Package
No oil, no paint ,no wrap on surface of non-magnetic drill stabilizer.
Non-magnetic drill stabilizers will be tighten on the steel shelf.
6.Inspection Certificates and Quality control information
    Inspection Certificate should include product name,furnace number,size,wall thickness difference test results,chemical composition,mechanical property,relative permeability test results, magnetic field gradient results, Intergranular Corrosion Inspection results,Ultrasonic Test results, surface quality.
 
 -----------