Products

Stabilizers, calibrators and centralizers

Stabilizers, calibrators and centralizers are united by one common name — a supporting and centralizing or calibrating and centering tool.

Calibrator is located directly above the bore bit, the stabilizer is installed above the calibrator or between the drill collars, the centralizer is mounted on the body of the bottom-hole motor or in the column of the drill collars.

The introduction of a supporting and centralizing tool into the drill string is mandatory, especially in case of drilling deep and ultradeep wells. It helps to avoid excessive well deviation, prevent harmful keyseating on the walls of the well, eliminate irregularities on these walls, avoid well narrowing and prolong the life time of the bore bit, reducing the time required to drill the borehole.

Stabilizers, calibrators and centralizers are made of high-quality alloyed steel, which is thermally treated, giving optimum mechanical properties of steel. Also, stabilizers, calibrators and centralizers can be manufactured from a non-magnetic steel mark. All screw joints are made strictly in accordance with GOST and API. Sizes and shapes of products are operated in accordance with the requirements of GOST and API Spec.

We offer a wide range of products, made in accordance with the requirements of GOST and API Spec. All products are made according to previously agreed customer’s drawings, taking into account shapes and sizes, and also values and hard bundling shapes.

Stabilizers

Stabilizers are intended to stabilize (improve) the operation of the guide section of the drill string by limiting the pipeline deflection, especially in the presence of caverns, dampening transverse (partially longitudinal and torsional) vibrations of the drilling tool at its contacts with the borehole wall.

Stabilizers are structurally similar to centralizers and calibrators. Stabilizers have different shapes, sizes and design. Depending on a design and used materials type, stabilizers are used in different rocks types.

Stabilizers sizes

No.
Working OD (mm)
ID (mm)
Total length (mm)
Blade working
length (mm)
Thread type Design
Top Down
1 292,1 90 1800 900 6 5/8 REG 6 5/8 REG 3 straight blades
2 292,1 90 1800 900 6 5/8 REG 6 5/8 REG 3 spiral blades
3 212,7 71 1600 800 5 1/2 FN 5 1/2 FN 3 straight blades
4 212,7 71 1600 800 5 1/2 FN 5 1/2 FN 3 spiral blades
5 141,2 44 1200 400 3 1/2 REG 3 1/2 REG 3 straight blades
6 141,2 44 1200 400 3 1/2 REG 3 1/2 REG 3 spiral blades

Calibrators and centralizers

Calibrators and centralizers are used as a link element of a drill string bottom when drilling for oil and gas. Calibrators and centralizers are intended to:

  • calibrate the well bore along the bore bit diameter;
  • improve operating conditions of a bore bit;
  • diminish hole curvature.

Bladed calibrators are intended for calibrating and centralizing a drill string and a bore bit in order to improve operating conditions of a bore bit, a bottom-hole motor and a drill string. Calibrators and centralizers with straight blades help to diminish rod friction when drilling soft formations, that apt to swelling and a thick mud cake capping.

Bladed spiral calibrators are intended for well bore enlargement and calibrating along a bore bit diameter and centralizing and improvement of a bore bit operating conditions in soft, intermediate and hard abrasive and low-abrasive formations. Calibrators are produced with straight and spiral blades, for soft and intermediate formations, and for intermediate and hard formations. Calibrators and centralizers with spiral blades completely overlap the well cross section and form a continuous circular contact with its wall. Such calibrators and centralizers are recommended for use in turbine and rotary drilling of hard and intermediate rocks.

Our calibrators are made of steel type 40ХН2МА with straight or spiral blades with reinforcement of their working surfaces with a hardband coating "Technolase 40S" by laser cladding".

Laser cladding advantages:

  • low level of details heating, reduced heat affected zone lead to low tensions in the material of the product. - a low level of stirring of the deposited material with the material of the product (approximately 1%) compared to plasma-jet hard-facing technology (about 10%) makes it possible to obtain the necessary properties at lower coating thicknesses (from 0.5 to 1 mm with laser cladding versus from 4 to 5 mm for plasma-jet);
  • metallurgical adherence leads to an increase in impact resistance in comparison with coatings obtained by the high velocity oxygen fuel process method;
  • the robotic station allows coating on a task geometry, and ensures perfect accuracy and repetition of the process during runout and hardening of polysurfaces. It is not necessary to mask the adjacent surfaces off;
  • the use of licensed powder materials produced by the world-recognized French company Technogenia - which uses unique spherical particles of tungsten carbide Spherotene® with a hardness of 3000 HV — makes it possible to obtain coatings with solid particles evenly distributed in it, resistant to any kind of abrasive wear;
  • the energy of the diode laser is evenly distributed over the area of the welding spot, which makes it possible to accurately control the welding process and avoid overheating and dissolution of tungsten carbide particles.

Calibrators and centralizers sizes

No.
Working OD (mm)
ID (mm)
Total length (mm)
Blade working
length (mm)
Thread type Design
Top Down
1 393,7 89 1212 280 NC61 6 5/8 REG 3 spiral blades
2 390,5 101 1252 320 6 5/8 FN 6 5/8 FN 5 straight blades
3 393,7 82 756 220 6 5/8 FN 6 5/8 FN 5 spiral blades
4 390,5 120 750 380 6 5/8 REG 7 5/8 REG 3 straight blades
5 292,1 90 1175 320 6 5/8 FN 6 5/8 REG 3 spiral blades
6 295,3 90 1252 400 6 5/8 REG 6 5/8 REG 5 straight blades
7 295,3 120 546 240 6 5/8 REG 6 5/8 REG 5 straight blades
8 292,1 76 567 170 6 5/8 REG 6 5/8 REG 3 straight blades
9 215,9 90 957 310 5 1/2 FN 5 1/2 FN 3 spiral blades
10 214,3 71 784 340 NC46 NC46 5 straight blades
11 215,9 82 546 280 4 1/2 REG 4 1/2 REG 3 spiral blades
12 214,3 82 546 280 4 1/2 REG 4 1/2 REG 5 straight blades
13 142,8 44 397 87 3 1/2 REG 3 1/2 REG 5 spiral blades
14 141,2 44 397 87 3 1/2 REG 3 1/2 REG 5 straight blades
15 123,8 32 259 100 2 7/8 REG 2 7/8 REG 5 spiral blades