Anti-friction Device for Drilling Elements Reducing Torque
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Solution Overview
Problem
Drilling operations in deep or extended reach wells experience high friction between drilling elements and well walls, leading to increased torque requirements, which can damage equipment and result in higher costs and environmental issues with oil-based muds.
Innovation Solution
An anti-friction device, such as a ring with a hollow cylindrical shape, is associated with drilling elements like drill pipes or tool joints, featuring a larger outside diameter and smaller inside diameter to reduce friction by rotating independently and abutting on well walls, thereby reducing the torque needed for drilling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If drilling elements are used in deep or extended reach wells, then drilling depth is increased, but friction against borehole walls increases significantly
Solution Approach 1:
The patent introduces a friction reduction device as an intermediary component between the drilling element and the borehole wall. This device includes a friction reduction element with a surface that contacts the borehole wall, while the drilling element contacts the friction reduction device, thereby mediating the interaction and reducing direct friction between the drilling element and the borehole wall.
Solution Approach 2:
The patent changes the physical parameters of the friction reduction device, specifically its diameter being between 0.8 to 1.2 times the diameter of the drilling element, and its length being between 0.5 to 2.0 times the diameter of the drilling element. These parameter optimizations enable the device to effectively reduce friction while maintaining structural integrity and functional performance.
2Power
If higher torque is applied to overcome friction, then drilling capability is improved, but risk of equipment damage increases
Solution Approach 1:
The friction reduction device acts as a mediator that reduces the torque required for drilling operations. By minimizing friction between the drilling element and borehole wall, the device allows the top drive to operate within its maximum torque capacity, preventing equipment overload and damage while maintaining effective drilling capability.
3Force
If oil-based drilling muds are used to reduce friction, then friction is reduced, but environmental harm increases
Solution Approach 1:
The friction reduction device serves as a mechanical intermediary that replaces the need for oil-based drilling muds. By providing a dedicated friction reduction element, the system achieves friction reduction through mechanical means rather than chemical additives, thereby eliminating the environmental contamination associated with oil-based muds.
Solution Approach 2:
The patent replaces the chemical-based friction reduction method (oil-based drilling muds) with a mechanical solution (friction reduction device). This substitution eliminates the need for harmful chemical substances while achieving the same friction reduction effect through mechanical contact and surface interaction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The anti-friction device significantly reduces friction and wear on drilling elements, minimizing the risk of equipment failure, lowering operational costs, and enhancing drilling speed and safety by allowing reduced torque applications.
Implementation Method 1
reduce the sliding, rolling or mixed friction between the drilling element and the walls of the open borehole or the walls of casings
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Anti-friction device (3) associated with a drilling element (5), the latter having a substantially cylindrical shape, with a first outside diameter (dl) and a longitudinal extension along a first axis (X). The drilling element (5) comprises at least one housing (6) for receiving said anti-friction device (3). The anti-friction device (3) has a hollow cylindrical shape having an inside diameter (d) which is smaller than said first diameter (dl) of the drilling element (5) and an outside diameter (D) which is greater than said first diameter (dl) of the same drilling element (5). The anti-friction device (3) is adapted to rotate about said first axis (X) in said housing (6), independently of the drilling element (5).