Main Specifications
| Standards | API Spec 7-1 |
|---|---|
| Types | Integral blade, welded blade, replaceable sleeve, non-rotating |
| Positions | Near-bit (box/box), drill collar string (box/pin) |
| Steel grades | Modified AISI 4145H, non-magnetic (non-mag) |
| Hardfacing | HF1000 — HF5000 |
A Stabilizer for Every Drilling Application
Stabilizers are an integral part of the bottom hole assembly. They concentrate the weight of the drill collars on the bit, stiffen the BHA, and keep the drill collars away from the borehole wall, thus reducing the risk of stuck pipe.
We offer a large range of stabilizers for all possible bore sizes and formations. Special stabilizers such as roller reamers, hole openers, and key seat wipers complete this selection and make sure you will always find the right stabilizer for your drilling application.
Integral Blade Stabilizer (IBS)
Machined from a single piece of high strength AISI 4145H or non-magnetic steel, integral blade stabilizers (IBS) eliminate the risk of blades falling into the wellbore.
Available with either spiral blades at different angles or straight blades. Spiral blades ensure 360° surface contact, while straight blades provide maximum fluid concentration.
Dressed with an optimal hardfacing solution, our integral blade stabilizers are suitable for most formations, from soft to abrasive.
Hole size ranges
- Straight blade stabilizer: 5″ — 28 1/2″
- Spiral blade stabilizer: 5″ — 36″
- Watermelon stabilizer: 8″ — 28″
Welded Blade Stabilizer
With the blades welded onto a forged mandrel, welded blade stabilizers are an economical alternative to integral blade stabilizers for soft and medium hard formations.
Full-length heat treatment and thorough non-destructive tests of all welding welding seams ensure maximum robustness.
Available in straight blade and spiral blade design with 3 or 4 blades per stabilizer.
Stabilizer Blade Types
Highdrilling welded and integral stabilizers are available with blades of the following wrap angles.
- Straight blade
- Open spiral: 180 — 220° wrap angle
- Full spiral: 300 — 350° wrap angle
- Tight Spiral: 500 — 600° wrap angle
Spiral blades are right-handed, but left-handed spirals can be furnished on request.
Replaceable Sleeve Stabilizer
Consisting of a single mandrel and a replaceable sleeve, replaceable sleeve stabilizers are are ideal in remote areas, where repairs and redressing of the blades are not feasible.
The sleeve can be changed easily on the drill floor without the need of special tools. As an additional benefit one mandrel can be used with sleeves of different sizes, reducing equipment costs.
Non-Rotating Sleeve Stabilizer (Rubber Sleeve Stabilizer)
Made from special polyurethane, the sleeve on a non-rotating sleeve stabilizer remains stationary on the mandrel during drilling. This way it stabilizes the drill string without underreaming.
Rubber sleeve stabilizers can be used in hard and abrasive formations, as wear on the sleeves is much lower compared to other stabilizer types.
Save and easy handling: Sleeves can be replaced fast and easily on the drill floor. Their seamless design prevents loss of sleeve in the wellbore.
Stabilizer Sizes and Connections
Common stabilizer specifications are listed here. Others holes sizes, neck diameters, and connections are available on request. All dimentions are in inches.
| Hole Size | Neck Diameter | Connections (Both String & Near-Bit) |
|---|---|---|
| 5-5/8 | 4-1/8 to 4-3/4 | NC31 (2-7/8 IF) · NC38 (3-1/2 IF) · 3-1/2 REG |
| 5-3/4 | 4-1/8 to 4-3/4 | NC31 (2-7/8 IF) · NC38 (3-1/2 IF) · 3-1/2 REG |
| 5-7/8 | 4-1/8 to 4-3/4 | NC31 (2-7/8 IF) · NC38 (3-1/2 IF) · 3-1/2 REG |
| 6 | 4-1/8 to 4-3/4 | NC31 (2-7/8 IF) · NC38 (3-1/2 IF) · 3-1/2 REG |
| 6-1/8 | 4-1/8 to 4-3/4 | NC38 (3-1/2 IF) · 3-1/2 REG |
| 6-1/4 | 4-1/8 to 4-3/4 | NC38 (3-1/2 IF) · 3-1/2 REG |
| 6-1/2 | 4-1/8 to 4-3/4 | NC38 (3-1/2 IF) · 3-1/2 REG |
| 6-5/8 | 4-1/8 to 4-3/4 | NC38 (3-1/2 IF) · 3-1/2 REG |
| 6-3/4 | 4-1/8 to 4-3/4 | NC38 (3-1/2 IF) · 3-1/2 REG |
| 7-3/8 | 6-1/4 | NC46 (4 IF) · 4-1/2 REG |
| 7-1/2 | 6-1/4 | NC46 (4 IF) · 4-1/2 REG |
| 7-7/8 | 6-1/4 | NC46 (4 IF) · 4-1/2 REG |
| 8-1/4 | 6-1/4 to 6-3/4 | NC46 (4 IF) · NC50 (4 1/2 IF) · 4-1/2 REG · 6-5/8 REG |
| 8-3/8 | 6-1/4 to 6-3/4 | NC46 (4 IF) · NC50 (4 1/2 IF) · 4-1/2 REG · 6-5/8 REG |
| 8-1/2 | 6-1/4 to 6-3/4 | NC46 (4 IF) · NC50 (4 1/2 IF) · 4-1/2 REG · 6-5/8 REG |
| 8-3/4 | 6-1/4 to 6-3/4 | NC46 (4 IF) · NC50 (4 1/2 IF) · 4-1/2 REG · 6-5/8 REG |
| 9 | 6-3/4 to 7-3/4 | 4-1/2 REG · 6-5/8 REG |
| 9-1/2 | 6-3/4 to 7-3/4 | 4-1/2 REG · 6-5/8 REG |
| 9-5/8 | 6-3/4 to 7-3/4 | 4-1/2 REG · 6-5/8 REG |
| 9-7/8 | 6-3/4 to 7-3/4 | 4-1/2 REG · 6-5/8 REG |
| 10-5/8 | 6-3/4 to 7-3/4 | 4-1/2 REG · 6-5/8 REG |
| 11 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 12 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 12-1/4 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 13-1/2 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 14-3/4 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 16 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 16-1/2 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 17 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 17-1/2 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 20 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 22 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 23 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 24 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 26 | 8 to 9-1/2 | NC56 · NC61 · 6-1/2 REG · 6-5/8 REG · 7-5/8 REG |
| 28 | 9 to 9-1/2 | 7-5/8 REG · 8-5/8 REG |
| 30 | 9 to 10 | 7-5/8 REG · 8-5/8 REG |
| 36 | 9-1/2 to 10 | 7-5/8 REG · 8-5/8 REG |
Available Steel Grades
Highdrilling Stabilizers can be manufactured from either modified AISI 4145H steel or non-magnetic stainless steel.
AISI 4145H Mod Steel
AISI 4145H Mod is a special chromium molybdenum steel grade. Heat treated to API Spec 7, it provides our stabilizers with a high tensile strength, resistance to shock and wear.
- Hardness: 285-341 HB (1 inch below surface)
- Impact strength: 54 J (ASTM A 370 — Charpy V-notch)
Non-Magnetic (Non-Mag) Steel
Logging while drilling (LWD) operations require stabilizers and drill collars to be made from non-magnetic stainless steel, in order to avoid magnetic interference with the measurement equipment.
In addition, stainless steel bottom hole tools are used in aggressive environments due to their good resistance to corrosion.
For our non-magnetic stabilizers we use P530 Mn-Cr-N quality stainless steel that meets all of the above requirements.
- Hardness: min. 260-350 HB HB
- Impact strength: 122 J
- Corrosion resistance: Tested and passed according to ASTM 262 practice E
- Magnetic permeability: < 1,001
Hardfacing Types
We can dress your stabilizers with several different types of hardfacing (HF 1000 through HF 5000). If in doubt which one to choose, we will help you find the best hardfacing option based on the formation characteristics encountered downhole.
HF 1000
Crushed tungsten carbide held in a nickel bronze matrix. The 3mm grain size ensures greater concentration of carbide which is ideal for soft formation drilling.
HF 2000
Trapezoidal tungsten carbide inserts held in a sintered carbide nickel bronze matrix. This will give a greater depth of carbide coverage — ideal for high deviation drilling in abrasive formations.
HF 3000
Tungsten carbide inserts set in a powder spray deposit ideal for abrasive formations. Recommended for non-magnetic stabilizers
HF 4000
Tungsten carbide inserts (button type). The inserts have been developed to allow cold insertion and maintain close fit. A greater concentration of inserts on the bottom third of the blade and leading edge will increase surface contact to reduce wear in highly abrasive formations.
HF 5000
This oxy-acetylene process applies tough molten carbide particles of varying sizes held in a nickel chrome matrix which provides excellent bonding properties and greater surface wear characteristics. Surface hardness levels over 40 HRC. Ideal for geothermal applications over 350°C.
How to Order
The following lists provide you with the information needed to order or inquiry about an API stabilizer. If you don’t have all of the required specifications at hand, don’t worry. Just send us what you have and we will figure out the rest with you.
Required Information about Stabilizer
- Stabilizer type: Integral, welded, replaceable, or non-rotating
- Drill string position: String or near-bit
- Wrap: Tight spiral, full spiral, open spiral or straight
- Hole diameter: Same as drill bit size
- Neck diameter: Same as drill collar size
- Connections: Same as the connection of the drill collar and (in case of a near-bit stabilizer) the connection of the drill bit.
- Steel: AISI 4145H or non-magnetic
- Hardfacing: Any of HF-1000 through HF-5000
Optional Requirements
- Connection Stress Relief features, per ISO 10424-2 (API Spec 7-2)
- Connection cold working
- Connection surface treatment: Optional for non-magnetic stabilizers only
- Float valve recess: For near-bit stabilizers only
- Left hand spiral: For spiral blade stabilizers only