Controlled Slip Connection for Directional Drilling Friction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In directional drilling operations, maintaining the rotational orientation and weight on the drill bit becomes challenging due to the increased flexibility of drill pipes, which leads to static friction issues and binding in non-vertical well holes, making it difficult to keep the weight constant on the bit.
Innovation Solution
A controlled slip connection system is introduced, comprising a pump section, hydraulic section, and controller section, which allows the drill pipe to rotate continuously while providing a rotationally stationary surface for the mud motor, reducing static friction by adjusting the flow rate of hydraulic fluid and transferring torque effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the drill pipe is held stationary to maintain rotational orientation, then the mud motor can react against a stationary surface, but the drill pipe becomes flexible and difficult to control, increasing static friction and binding in non-vertical well holes
Solution Approach 1:
The system transitions from a static connection to a dynamic controlled slip connection that allows controlled rotation of the drill pipe while maintaining mud motor stability. The controlled slip mechanism enables the drill pipe to rotate at adjustable speeds, converting static friction problems into manageable dynamic friction conditions.
Solution Approach 2:
The system changes the rotational speed parameter of the drill pipe from zero to controlled rotation. By adjusting the rotation speed parameter, the system transforms the friction condition from static (high friction) to dynamic (lower friction), improving ease of operation while maintaining orientation stability through controlled motion.
2Ease of operation
If the drill pipe rotates continuously, then static friction is reduced and weight on the bit is maintained, but the mud motor loses a rotationally stationary surface to react against
Solution Approach 1:
The connection system is segmented into two independent rotational systems: the drill pipe rotation and the mud motor reaction surface. The controlled slip connection allows the drill pipe to rotate while the mud motor maintains its own rotational stability, effectively separating these two functions that were previously coupled.
Solution Approach 2:
The controlled slip connection acts as an intermediary mechanism between the rotating drill pipe and the stationary mud motor. It mediates the rotational motion, allowing the drill pipe to rotate while transmitting controlled torque to maintain the mud motor's rotational stability, thus resolving the contradiction between the two requirements.
3Stability of the object's composition
If the drill pipe is made more rigid to maintain rotational orientation, then the mud motor can be held stationary, but the drill pipe becomes more difficult to rotate and control in non-vertical sections
Solution Approach 1:
The system employs dynamic control of the slip connection to allow the drill pipe to rotate at controlled speeds. This dynamic approach eliminates the need for excessive rigidity, as the controlled rotation manages the orientation stability through motion control rather than structural stiffness.
Solution Approach 2:
The system replaces the mechanical rigidity approach with a hydraulic control system. The hydraulic pump and controlled slip mechanism use fluid pressure and controlled friction to manage torque transmission, substituting mechanical rigidity with controllable hydraulic forces that achieve the same orientation stability with reduced rotational resistance.
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
This system enables the drill pipe to rotate during directional drilling, reducing static friction and modifying the weight on the drill bit, thereby maintaining the desired orientation and reducing friction between the drill pipe and the wellbore.
Implementation Method 1
pumping a drilling mud flow through the drill pipe and the controlled slip connection system to the mud motor
Implementation Method 2
reducing static friction by adjusting the flow rate of hydraulic fluid and transferring torque effectively
Implementation Method 3
transferring torque effectively
Data Source
AI summary
A controlled slip connection system is configured to be coupled between a drill pipe and a directional drilling assembly, and the slip connection system is configured to enable continual rotation of the drill pipe while providing a rotationally stationary surface for a mud motor of the directional drilling assembly to react against.