Drilling Stabilizer Downhole
| Hole Size (in) | Standard (in) | Blade (in) | (kgs) |
|---|---|---|---|
| 6″ – 6 3/4″ | 4 1/2″ – 4 3/4″ | 2 3/16″ | 160 |
| 7 5/8″ – 8 1/2″ | 6 1/2″ | 2 3/8″ | 340 |
| 9 5/8″ – 12 1/4″ | 8″ | 3 1/2″ | 750 |
| 14 3/4″ – 17 1/2″ | 9 1/2″ | 4″ | 1000 |
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Drilling Stabilizer Downhole Equipment of BHA
Main Quality
The Drilling Stabilizer is a crucial piece of downhole equipment used within the Bottom Hole Assembly (BHA) of a drill string. Its primary function is to stabilize the BHA in the borehole to prevent issues such as sidetracking, vibrations, and other irregularities that could compromise the quality of the drilled hole.
These stabilizers are designed to ensure that the drilling operation proceeds with minimal deviation from the planned borehole trajectory, ensuring that the hole remains straight and of consistent quality. They also minimize the risk of damage to the drill string and the wellbore.
Description
A drilling stabilizer typically consists of a hollow cylindrical body with stabilizing blades attached to it. These blades, which can either be straight or spiralled, are made from high-strength steel and are hardfaced for enhanced wear resistance. This makes them capable of withstanding the extreme conditions encountered during drilling operations.
There are several types of drilling stabilizers used in the oilfield today, with each designed to meet specific operational requirements:
- Integral Stabilizers:
These are made from a single piece of steel, ensuring maximum strength and durability. They are the most common type used in drilling operations. - Replaceable Sleeve Stabilizers:
In this design, the blades are mounted on a sleeve that is then screwed onto the main body of the stabilizer. This design is often more economical, especially when repair facilities are not nearby, as it allows for easier replacement of the blades. - Welded Blades Stabilizers:
The blades in this design are welded directly to the body. While not recommended for oil wells due to the potential risk of losing the blades, they are often used in water wells or in cost-sensitive drilling applications.
The stabilizers are placed strategically within the BHA to ensure proper stabilization throughout the drilling process. Typically, one stabilizer is positioned just above the drill bit (near-bit stabilizer) and one or two stabilizers are placed among the drill collars (string stabilizers). This configuration ensures that the BHA remains centered in the wellbore, reducing the risks of hole deviation and vibrations.
Technical Data
| Hole Size (in) | Standard DC Size (in) | Wall Contact (in) | Blade Width (in) | Fishing Neck Length (in) | Blade Undergage (in) | Overall Length (in) | Approx. Weight (kgs) |
|---|---|---|---|---|---|---|---|
| 6″ – 6 3/4″ | 4 1/2″ – 4 3/4″ | 16″ | 2 3/16″ | 28″ | -1/32″ | 74″ | 70 |
| 7 5/8″ – 8 1/2″ | 6 1/2″ | 16″ | 2 3/8″ | 28″ | -1/32″ | 75″ | 70 |
| 9 5/8″ – 12 1/4″ | 8″ | 18″ | 3 1/2″ | 30″ | -1/32″ | 83″ | 78 |
| 14 3/4″ – 17 1/2″ | 9 1/2″ | 18″ | 4″ | 30″ | -1/16″ | 92″ | 87 |
| 20″ – 26″ | 9 1/2″ | 18″ | 4″ | 30″ | -1/16″ | 100″ | 95 |
More Details
- Material Composition:
The stabilizers are typically made of high-strength steel to withstand the harsh environments encountered during drilling operations. The hardfacing applied to the blades adds to their wear resistance, ensuring that the stabilizer performs well throughout the entire lifespan of the drilling operation. - Blade Types:
The blades can be straight or spiraled, with the spiraled blades providing better performance in reducing friction and preventing stuck pipe scenarios. The choice between the two depends on the specific drilling conditions and the borehole profile. - Strategic Placement in BHA:
The placement of stabilizers in the BHA is critical for preventing issues such as sidetracking or vibrations that can lead to costly delays and poor-quality wells. The stabilizers ensure that the BHA stays centered within the borehole, allowing for smooth and consistent drilling. - Replaceable and Repairable:
Some types of stabilizers, such as the replaceable sleeve stabilizer, allow for easy maintenance and replacement of the blades without having to replace the entire stabilizer. This is particularly useful when repairs need to be carried out quickly to minimize downtime during the drilling operation. - Cost-Effectiveness:
The welded blade stabilizers are generally more economical and are used in non-critical applications, such as water well drilling or low-cost oilfields, where the risk of losing the blades is lower. These stabilizers provide a cost-effective solution for drilling in less demanding environments. - Enhanced Hole Quality:
By stabilizing the BHA and preventing unintentional sidetracking, the drilling stabilizer helps ensure that the hole being drilled remains straight and of high quality. This is essential for maintaining the well’s integrity and ensuring that it meets the required specifications. - Versatility:
The Drilling Stabilizer is designed for use in a variety of drilling applications, from oil wells to water wells, and is a key component in drilling systems around the world. Its ability to reduce vibrations and stabilize the BHA makes it an essential tool for efficient and reliable drilling operations.
Hole Size (in) | Standard DC Size (in) | Wall Contact (in) | Blade Width (in) | Fishing Neck Length (in) | Blade Undergage (in) | Overall Length (in) | Approx Weight (kgs) | |
String | Near-bit | |||||||
6″ – 6 3/4″ | 4 1/2″ – 4 3/4″ | 16″ | 2 3/16″ | 28″ | -1/32″ | 74″ | 70″ | 160 |
7 5/8″ – 8 1/2″ | 6 1/2″ | 16″ | 2 3/8″ | 28″ | -1/32″ | 75″ | 70″ | 340 |
9 5/8″ – 12 1/4″ | 8″ | 18″ | 3 1/2″ | 30″ | -1/32″ | 83″ | 78″ | 750 |
14 3/4″ – 17 1/2″ | 9 1/2″ | 18″ | 4″ | 30″ | -1/16″ | 92″ | 87″ | 1000 |
20″ – 26″ | 9 1/2″ | 18″ | 4″ | 30″ | -1/16″ | 100″ | 95″ | 1800 |
Conclusion
The Drilling Stabilizer is an indispensable piece of downhole equipment, playing a crucial role in ensuring that drilling operations proceed smoothly and efficiently. Its ability to stabilize the BHA helps prevent sidetracking, reduce vibrations, and maintain high hole quality throughout the drilling process. With various types available to suit different drilling conditions, including integral stabilizers, replaceable sleeve stabilizers, and welded blade stabilizers, the drilling stabilizer offers flexibility, durability, and cost-effectiveness for a wide range of drilling applications.
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