Spiral integral drilling stabilizer
A drilling stabilizer (string and near bit) 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 are spiraled, and are hardfaced for wear resistance.
The spiral integral drilling stabilizer - Contains spiraled blades around the tube circumference to provide 360° stabilization. The spiral edges provide an agitating action to prevent sticking.
Integral Blade Stabilizer is integrally made of high strength alloy steel AISI 4145H, usually with 3 blades or 4 blades. The working surface of Integral Blade Stabilizer is provided with carbide insert-extended product life.
Classification based on the position in the string:
a. In-string stabilizer: If a stabilizer is used in the string between two drill collars, it is called an 'In-string stabilizer'. This is the most used configuration, and the stabilizer has a pin-to-box connection to install it within the string. The position and the gauge of the stabilizer are decided based on string vibration simulation and build tendency analysis to suit the well plan requirements.
b. Near-bit stabilizer: If a stabilizer is installed just above the bit, it is called a 'Near-bit stabilizer'. Since the drill bit has a pin connection, the near-bit stabilizer has box-to-box connections to be able to connect between the pin end of the drill bit and the pin end of the drill collar. A near-bit stabilizer reduces the bit tilt and provides more stability to the bit while drilling. Having a near-bit stabilizer helps in reducing bit whirl and hole crookednes
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