Product Description

Non-Magnetic drill tools Materials of TianHe Non-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has following characteristic: The chemical composition should be controlled strictly during the refining and forging process. With excellent lower Magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking and no tendency to galling. Mechanical Properties OD  Size Yield Strength  σ0.2  Mpa(psi) Tensile Strength σb  Mpa(psi) Elongation  δ4% Reduction of are  % Impact  Ft.1b 3 1/8~6 3/4 ≥758  (110，000) ≥827  (120，000) ≥18 50 ≥50 7~10 ≥689  (100，000) ≥758  (110，000) ≥20 Mechanical properties  TianHe non-magnetic has the listed mechanical properties along its overall length. Non-magnetic properties    Magnetic permeability (when MPS=1×105/4πNm)  * Relative Max: 1.010  * Average: μr≤1.005  Magnetic Field Gradient (hot spots)  * Max: B ≤ 0.05 micro Tesla/100mm Types of TianHe Non-magnetic products  Drill Collars  Short Drill Collars  Heavy Wall Drill Pipe  Crossover Subs  Integral spiral Stabilizers

 

DRILL COLLAR-STANDARD AND SPIRAL

Drill collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drill sting in tension. 

Tianhe drill collar has been approved by the NS-1 certification, it is manufactured from 4145H modified quenched and tempered steel,strictly metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness. It is heat treated along its entire length for uniform toughness and durability. Strict metallurgical tests are performed per specifications to ensure that the heat treatment produces consistent and maximum hardness through the depth of the bar.

FEATURES AND BENEFITS

1. A hardness range of 285 to 341 BHN and a charpy impact value of 40ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature.
2. Connections are completed (phosphate coated) to protect them from the elements after marching and to help prevent galling upon initial make-up.
3. Thread roots are cold rolled on API and H-90 CONNECTIONS.
4. Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections

When ordering pls specify:

1. Drill collar OD and ID
2. Overall length
3. Connections required (size and type)
4. Special features desired, for example:

4.1 Slick or spiral

4.2 Stress relief feature

4.3 Slip and / or elevator recess

4.4 Hard banding

 

SPECIAL FEATURES FOR DRILL COLLAR

Spiral grooving

In order to reduce differential pressure sticking, the surface of drill collars can be spiral-grooved.

Spiral grooving in order to avoid differential pressure sticking in the hole.

Note 1: loss of weight is approximately 4%, compared to slick drill collars.

Note 2: length of spiraled section allows reconditioning of connections.

Stress relief groove & bore back box

1. Stress relief grooves improve bending strength of pin and box connections and, therefore, durability. Stress relief grooves for box and pin are defined by API. 
2. Bore back box is nothing but gradual reduction of internal diameter by gradually increasing material cross sectional area at critical section. This will ultimately reduce drastically stress concentration during static / dynamic loading and prevents box connections from failure.

Smooth surface free of tool marks increases flexibility and permits bending without cracking last scratch of box thread covered by pin.

API stress-relief groove pin.

API bore back box.

Last scratch of box thread covered by pin.

Large radii reduce stress concentrations.

Hard banding

We provide several hard banding materials for customer’s choice: ARNCO-100XT, ARNCO-300xt, TCS-8000.

Slip and elevator recess

Slip and elevator recesses improve down hole handling efficiency and safety. Slip and elevator recesses are machined in accordance with API7-1

Recommended hardbanding location

Drill collars with slip and elevator recesses (ZIP)

1. 4’’long wear pad above elevator recess
2. 1’’long wear pad above slip recess.
3. 10’’ long wear pad under slip recess

Drill collars with slip recess:

1. 10’’ long wear pad under slip recess.
2. 4’’ long wear pad above slip recess.

Drill collars without slip and elevator recesses:

1. 10’’long wear pad at 30’’ from pin shoulder.
2. Spiral drill collar with slip and elevator recess

NON-MAGNETIC DRILL COLLAR

Tianhe non-magnetic drill collars are made from non-magnetic steel bars with low-strength by combining a proprietary chemical analysis and a rotary hammer forging process with low magnetic permeability excellent machine ability; it will not interfere with the specialized directional equipment and will enhance the performance of the drilling operation.

 

The Non-magnetic drill collars function as housing for the MWD tools; while at the same time provide the weight for drillstring. Tianhe non-magnetic drill collars are suitable for all types of drilling including straight and directional applications.

 

Each drill collar is fully inspected by internal inspection dept. all data obtained are recorded on the inspection certificate furnished with each drill collar. API monogram, serial number, OD, ID, type and size of connections are stamped on recessed mill flats.

 

We manufacture three type of nonmagnetic drill collar according to the customers’ order; include slick, spiral, and flex non-mag drill collar.

 

We can provide three type of non-magnetic drill collar according to the customer’s order; include slick, spiral and flex non-magnetic steel for complex drilling programs.

 

Slick non-magnetic drill collar

Tianhe slick non-magnetic drill collar provide the required weight on bit, and will not interfere with the direction drilling ability.

 

Spiral non-magnetic drill collar

Tianhe spiral non-magnetic drill collar is designed to allow greater flow area for drilling fluids, while providing the benefits of non-magnetic steel for complex drilling programs.

 

Flex non-magnetic drill collar

Tianhe flex non-magnetic drill collar is thinner and more flexible than standard drill collar. Their ability to make short radius turns, bend for high angles, and pass through severe doglegs makes them ideal for use in directional and horizontal applications. Manufactured with non-magnetic steel, this drill collar is well suited for housing MWD equipment.

 

HEAVY WEIGHT DRILL PIPE (API7-1)

Heavy weight drill pipe (shout for HWDP) IS AN INTERMEDIATE weight drill stem component which is used in conjunction with the drill pipe and drill collars, TIANHE HWDP is available in standard, spiral and non-magnetic designs. In some applications, heavy-weight also can be used instead of the drill collars. 

FEATURES ND BENEFITS 

1. A center upset or wear pad to increase tube life, reduce hole drag and differential sticking problems.
2. Connections are completed (phosphate coated) to protect them from the elements after machining and to help prevent galling upon initial make-up.
3. Thread roots are cold rolled on API and H-90 connections. And pressed steel thread protectors are supplied for standard connections.
4. Thread roots are cold rolled on API and H-90 connections. And pressed steel thread protectors are supplied for standard connections.

5．Hard banding and internal coating can be provided on customer’s request.

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