Description
P530, P550 and Project-Specified Non-Magnetic Alloys for Near-Bit and Drill-String Applications
ELITE supplies non-magnetic spiral blade stabilizers for MWD/LWD and directional-drilling BHAs where magnetic interference from conventional alloy-steel components must be controlled.
Stabilizers can be manufactured from project-approved non-magnetic alloy grades and configured for near-bit or drill-string positions.
Selection should be based on:
Hole size
Required stabilizer OD
Body OD
Bore ID
Upper and lower connections
Near-bit or string position
Required non-magnetic material grade
Relative magnetic permeability requirement
Magnetic-gradient requirement
Hardfacing
Quantity
We forge the body from non-magnetic alloy steel instead of the chrome-molybdenum steel we use on standard stabilizers, then heat-treat it to the hardness, strength, and shock resistance your well conditions call for. The wear belt carries demagnetized tungsten carbide inserts, set in a studded columnar pattern to protect the body without introducing any magnetic signature.
API Specification: API Spec 7-1 / ISO 10424-2 Certified
Relative Magnetic Permeability : ≤ 1.005 across full body and integral blades
Magnetic Field Gradient: le 0.05 μT
Structural Formats: Non-Mag Near-Bit Type (Box x Box) & Non-Mag String Type (Pin x Box)
Blade Designs: 3-Blade Integral Spiral, 4-Blade Integral Spiral, and Integral Straight Blade
Hole Size Range: 5 7/8″ to 26″ (149.2 mm to 660.4 mm)
Request a Factory Quotation for Non-Mag Stabilizers
Contact Engineering Team,Send your hole size and rib configuration for a quote:
Email: info@apidrillpipe.com
WhatsApp: +8618615995257
ELITE Non-magnetic drilling stabilizer two configurations:
Non-Magnetic Near-Bit Stabilizer
Assembles as a mandrel and sleeve. We screw the sleeve onto the body and tighten it against the shoulder, and we engineer the sleeve to resist accidental unscrewing while staying easy to swap out on the rig. Run this configuration directly above the bit to control trajectory in the most sensitive part of the BHA.
It is selected according to:Hole size,Required gauge OD,Bit or motor connection,Adjacent BHA components,Distance from the measurement package,Required magnetic spacing,Blade design,Hydraulic flow area,Formation abrasiveness.
Non-Magnetic Drill String Stabilizer
Runs higher in the string, spaced along the BHA to centralize the assembly and reduce vibration without sitting close enough to the sensor package to matter magnetically.
It may be used to support:BHA centralization,Directional tendency control,Controlled wall contact,Gauge maintenance,Protection of adjacent non-magnetic components.
Selection should follow the approved BHA design.
Provide:BHA position,Hole size,Blade OD,Body OD,Bore,Overall length,Top and bottom connections,Material requirement,Magnetic acceptance limits,Hardfacing requirement.
Both configurations thread to API connections and machine to your hole size and blade OD.
Features of Elite products:
Non-magnetic stabilizers are made of Non-magnetic drilling stabilizer materials, to avoid the induced magnetic field generated by magnetization of ferromagnetic materials interfering with the magnetic field measurement of the inclinometer while drilling, thereby ensuring accurate control of the wellbore trajectory.
A special thread structure is using to enhance the connection strength and reduce vibration transmission during drilling.
Non-magnetic coatings are added using technologies such as magnetron sputtering and ion implantation to enhance surface hardness (such as AlTiN-MoN coating).
Non-Magnetic Stabilizer Material Grades
| Material Grade | Typical Procurement Positioning | Buyer Should Confirm |
|---|---|---|
| P530 | Standard non-magnetic BHA applications | Mechanical properties, μr, corrosion requirement |
| P530 HS | Higher-strength P530-type requirement | Approved property range |
| P540 | Project-specific non-mag applications | MTC and magnetic properties |
| P550 | Higher mechanical-performance applications | Strength + magnetic specification |
| P580 | Project-specific severe-service selection | Approved project spec |
| P650 | High-strength non-magnetic applications | Actual mechanical requirements |
| P690 | High-strength project-specific applications | Supplier datasheet/MTC |
| P750 / P750 HS | Premium high-strength applications | Engineering approval required |
Material designation alone is not sufficient for procurement. The approved specification should define required mechanical properties, corrosion performance, relative magnetic permeability and magnetic-field gradient.
P530 vs P550 for Non-Magnetic Stabilizers
P530-type and P550-type non-magnetic alloys may be selected according to required mechanical strength, corrosion performance, magnetic properties and the customer’s approved BHA material specification.
P550 should not automatically be treated as a universal upgrade from P530. The correct choice depends on the project requirement and the supplier’s certified material properties.
| Selection Factor | P530-Type | P550-Type |
|---|---|---|
| Magnetic requirement | Confirm by specification | Confirm by specification |
| Mechanical strength | Standard/high depending grade | Generally selected where higher mechanical properties are required |
| Corrosion requirement | Project dependent | Project dependent |
| Machining | Non-mag alloy machining controls required | Non-mag alloy machining controls required |
| Best choice | Depends on approved BHA specification | Depends on approved BHA specification |
Why Use a Non-Magnetic Stabilizer in an MWD/LWD BHA?
Magnetic survey tools use the Earth’s magnetic field as part of the azimuth measurement process. Ferromagnetic BHA components positioned close to the survey package can distort the local magnetic field and affect measurement quality.
A non-magnetic stabilizer is used where BHA stabilization is required inside or close to the magnetic survey spacing interval without introducing the same level of magnetic interference associated with conventional alloy-steel components.
Typical applications include:
Directional drilling
Horizontal wells
MWD/LWD assemblies
Survey-sensitive BHA sections
Near-bit stabilization
String stabilization inside non-magnetic spacing
Non-Magnetic Stabilizer Machining Capability
ELITE can manufacture non-magnetic stabilizers from customer drawings or existing tool dimensions.
Deep-hole boring
Long-bed CNC machining
Spiral blade machining
Custom blade OD
NC / REG / IF threading
Double-shoulder connection where approved
Cold rolling of threads where specified
Copper plating / phosphating where applicable
Float bore
SRG
Custom drawing manufacturing
Application scenarios of non-magnetic drill tool stabilizers:
- Drilling inclination measurement scenario:
In directional drilling, Non-magnetic drilling stabilizer are usually using in conjunction with magnetic inclinometers to ensure that the real-time data of well inclination and azimuth are not interfering by ferromagnetism, which is especially important in complex formations (such as shale gas horizontal wells).
- High temperature and corrosive environment:
Through non-mag stabilizers coatings (such as TiN/AlTiSiN multilayer structure), the nearbit stabilizer can maintain performance at 800℃ high temperature and acidic environment, extending its service life.
| D₁ | L1±5 | D₂ | d | L±20 | Thread code on two ends mm(in) |
|||
| Short Type | Long Type | |||||||
| Near bit type | Drill string type |
Near bit type | Drill string type |
|||||
| L₃=150 | L1=350 | L₃=300 | L1=700 | |||||
| 165.1 164 163 |
165.1(61/2) | |||||||
| 190.5 190 189 |
400
500 |
159
178 |
57
71 |
056
1050 |
1100
1550 |
1450
1550 |
1650
1750 |
190.5(71/2) |
| 200.0 199 198 |
200.0(75/8) | |||||||
| 212.7 212 211 |
400
500 600 |
159
178 |
57
71 |
950
1050 1150 |
1100
1200 1650 |
1450
1550 1650 |
1650
1750 1850 |
212.7(83/8) |
| 215.9 215 214 |
215.9(81/2) | |||||||
| 222.2 221 220 |
222.2(83/4) | |||||||
| 241.3 240 239 |
400
500 009 |
178 | 71 | 950
1050 1150 |
1100
1200 1300 |
1450
1550 1650 |
1650
1750 1850 |
241.3(91/2) |
| 244.5 244 243 |
244.5(95/8) | |||||||
| 250.8 250 249 |
250.8(97/8) | |||||||
| 311.1 310 309 |
500 009 700 |
203
229 |
76 | 1150 1250 1350 |
1300 1400 1500 |
1750 1850 1950 |
1950 2050 2150 |
311.1(121/4) |
| 444.5 44.3 441 |
00S 009 700 |
1350 1450 1550 |
1500 1600 1700 |
1950 2050 2150 |
2150 2250 2350 |
444.5(171/2) | ||
A Non-magnetic drilling stabilizer is a piece of downhole equipment used in the bottom hole assembly (BHA) of a drill string. It mechanically stabilizes the BHA in the borehole in order to avoid unintentional sidetracking, vibrations, and ensure the quality of the hole being drilled.
Non-Magnetic Hardfacing Surface Protection
To extend blade operational life in abrasive formations without introducing ferromagnetic contamination, hardfacing alloys are deposited using controlled non-magnetic matrices:
HF1000 (Crushed Tungsten Carbide): Crushed tungsten carbide bound in a non-magnetic nickel-bronze matrix for abrasive open-hole conditions.
HF2000 (Trapezoidal Carbide Inserts): High-density trapezoidal tungsten carbide inserts embedded in non-magnetic matrix for extreme wear resistance.
HF3000 (Casing-Friendly Spray-Deposit): Smooth thermoweld coating for cased-hole re-entry or drilling inside casing strings without damaging casing walls.
HF5000 (PDC Inserts): Polycrystalline diamond compact cutters embedded on leading blade edges for high-RPM motor applications.
Hardfacing can improve blade gauge retention in abrasive formations, but the hardfacing system and application process should be reviewed for compatibility with the non-magnetic base material and the required magnetic specification.
Final magnetic properties should be verified after all machining, hardfacing and finishing operations where required by the purchase specification.
Non-Destructive Testing (NDT) & Quality Assurance
Because austenitic non-magnetic materials cannot be inspected via Magnetic Particle Testing (MT), every non-magnetic stabilizer undergoes strict alternative NDT procedures prior to dispatch:
Liquid Dye Penetrant Inspection (DPI): 100% surface inspection on connection threads, stress relief features, and hardfacing zones per ASTM E1417.
Ultrasonic Testing (UT): 100% full-body volumetric ultrasonic inspection per ASTM A388 to guarantee zero internal voids or inclusions.
Calibrated Permeability Verification: Every unit is individually certified with a calibrated permeability meter, and a official Mill Test Certificate (EN 10204 3.1) with magnetic test logs is attached.
ELITE Non-magnetic drilling stabilizer – FAQ
Q1: What magnetic permeability does your non-magnetic stabilizer maintain?
A: We hold relative magnetic permeability (μr) at or below 1.01 throughout the tool body, keeping the field around your MWD/LWD sensor clean.
Q2: Can I run a non-magnetic stabilizer with a standard non-magnetic drill collar?
A: Yes — we commonly pair non-magnetic stabilizers with non-magnetic drill collars in the sensor section of the BHA to keep the entire magnetic-sensitive zone interference-free.
Q2: Do you provide magnetic inspection reports?
A: Yes. Every non-magnetic stabilizer ships with a magnetic permeability test report alongside standard NDT and MTC documentation.
Q4: How does a non-magnetic stabilizer differ from a standard stabilizer in construction?
A: The body forges from non-magnetic alloy steel instead of chrome-molybdenum steel, and the wear belt uses demagnetized tungsten carbide inserts instead of standard hardfacing, so the tool doesn’t distort the sensor’s magnetic field.
Q5: Can non-magnetic stabilizers be magnetic-particle inspected (MT) during field maintenance?
A: No. Non-magnetic alloys do not hold magnetic fields, so Magnetic Particle Inspection (MT) will not work. Field inspection teams must use Liquid Dye Penetrant Inspection (DPI/PT) and Ultrasonic Testing (UT) for connection thread root and body crack detection.
Q6: Can you manufacture from an existing drawing?
A: Yes. An existing data sheet, drawing, product marking or sample can be reviewed for replacement or OEM production.
Q7: Can you supply a replaceable sleeve stabilizer?
A: Replaceable sleeve designs can be evaluated when the mandrel, sleeve, locking method, material and magnetic requirements are provided.
Q8: What magnetic reports are available?
A: The inspection scope can include permeability and magnetic field-gradient measurements linked to the product serial number.
The exact method and acceptance criteria must be agreed before production.
Q9: Can hardfacing be applied to a non-magnetic stabilizer?
A: Selected wear-protection systems can be evaluated according to formation abrasiveness, gauge requirement and magnetic restrictions.
Q10: Can third-party inspection be arranged?
A: Yes. The inspection agency, scope, witness points, cost and reporting requirements should be agreed before production.
Request a Factory Quotation for Non-Mag Stabilizers
Need API 7-1 certified Non-Magnetic Stabilizers for your directional drilling project? Contact our engineering team for instant technical support and pricing.
[ Submit Non-Magnetic Stabilizer RFQ ] Email: info@rigrs.com
[ Contact Engineering Team for Custom Thread / Blade Requests ] WhatsApp: +8618615995257
