Steerable Drill Bit Sidetracking with Deflection Guidance
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Solution Overview
Problem
Current sidetracking methods for drilling lateral boreholes often require multiple trips and result in significant contact between the drill bit and deflection member, leading to bit damage and reduced effectiveness.
Innovation Solution
A directional drilling system with a steerable drill bit and sensors to minimize contact between the drill bit and deflection member, using expandable steering pads to guide the bit along a desired trajectory and elevate it off the guide surface, allowing for single-trip lateral borehole drilling with reduced contact and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional sidetracking methods are used with multiple trips, then operational complexity is reduced, but productivity decreases and time is lost
Solution Approach 1:
The patent combines the deflection member placement and lateral borehole drilling operations into a single trip by integrating the deflection member with the bottomhole assembly. This merging of operations eliminates the need for separate trips to place the deflection member and then drill the lateral, thereby improving productivity while managing device complexity through functional integration.
Solution Approach 2:
The deflection member is positioned and oriented at the desired location and trajectory before the drilling operation begins. This preliminary positioning allows the drill bit to immediately follow the predetermined path when it contacts the deflection member, eliminating the need for subsequent adjustment trips and improving overall drilling efficiency.
2Manufacturing precision
If the drill bit contacts the deflection member extensively, then guidance is provided, but bit damage increases and manufacturing precision deteriorates
Solution Approach 1:
The deflection member features a localized guide surface with specific geometric properties (inclined plane) that provides precise directional guidance only where needed. This localized guidance mechanism ensures the drill bit follows the correct trajectory while minimizing unnecessary contact areas, thereby maintaining trajectory accuracy while reducing bit damage.
Solution Approach 2:
The guide surface of the deflection member acts as an intermediary element between the drill bit and the desired trajectory. It provides controlled, minimal contact that directs the bit along the correct path without requiring extensive contact, thus serving as a mediator that achieves precision while protecting the bit from excessive wear.
3Productivity
If multiple trips are required for sidetracking, then operational complexity is reduced, but time is lost and productivity decreases
Solution Approach 1:
The patent merges the deflection member placement operation with the drilling operation into a single trip. The deflection member is positioned and secured before the drill bit begins drilling the lateral borehole, eliminating the need for separate trips and significantly reducing the time lost to operational transitions, thereby improving productivity.
Solution Approach 2:
The deflection member is preliminarily positioned and oriented at the exact desired location and trajectory before the drilling operation commences. This advance preparation ensures that when the drill bit contacts the deflection member, it immediately follows the correct path without requiring additional trips for adjustment or repositioning, thus minimizing time loss and maximizing drilling speed.
Data Source
AI summary
A steerable drill bit may be used to drill a lateral borehole from a primary wellbore. The steerable drill bit may be part of a bottomhole assembly that also includes a directional control system. A deflection member, such as a whipstock, may be anchored in the primary wellbore. When the bottomhole assembly approaches the deflection member, the directional control system may steer the steerable drill bit to reduce and potentially eliminate contact between the steerable drill bit and a ramped surface of the deflection member. By restricting contact between the deflection member and the steerable drill bit, cutting elements of the steerable drill bit may obtain an increase in cutting efficiency and/or effective life.