A 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.
It is composed of a hollow cylindrical body and stabilizing blades, both made of high-strength steel. The blades can be either straight or spiralled, and are hardfaced for wear resistance.
There are mainly three types of drilling stabilizers used in the oilfield today.
1. Integral stabilizer, which is fully machined out of a single piece of steel. This type tend to be norm and widely used.
2. Replaceable sleeve stabilizer, where the blades are located on a sleeve, which is then screwed on the body. This type can be economical when no repair facilities are available close to the well being drilled.
3. Welded blades stabilizer, where blades are welded onto the body. This type is usually not advised on oil wells due to the risks of losing blades, but is regularly used when drilling water wells or on low-cost oilfields.
Usually 2 to 3 stabilizers are fitted into the BHA, including one just above the drill bit (near-bit stabilizer) and one or two among the drill collars (string stabilizers).
China Vigor's Stabilizer bodies are made from AISI 4145H Mod Alloy Steel, fully heat treated to 285-341 Brinell Hardness, 52 joules min. Impact Strength. All connections are cold rolled and phosphate coated according to NS-1 if requirement. API stress relief groove pin & bore back box are coated with API thread compound. Lifting bail thread protectors on both ends are available upon request.
Material
AISI 4145H MOD
Non-magnetic
Hard Facing
HF1000 Hard Facing with Crushed Carbide
HF2000 Hard Facing with Crushed Carbide with Trapezoidal Insert
HF3000 Hard Facing with Tungsten Carbide Insert set in a powder spray deposit
HF4000 Hard Facing with Tungsten Carbide Insert
HF5000 Hard Facing with Fused Tungsten Carbide in Nickle chrome boron matrix
Special Feature
Stabilizer forgings are available
Pin with SRG, Box with Bore Back
Cold Rolled and Phosphated
