Self-Adjusting Deflection Device for Directional Drilling
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Solution Overview
Problem
Existing directional drilling methods using fixed bends in drilling assemblies result in uneven boreholes, increased stress and vibrations on mud motor components, and high friction, leading to reduced build rates and increased drilling time and expenses.
Innovation Solution
A self-adjusting drilling assembly with a deflection device that tilts relative to the upper section when stationary for curved sections and straightens when rotated, utilizing sensors and force application mechanisms to control drilling operations and reduce friction and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed bend (AKO) is used in the drilling assembly to drill curved sections, then the drill bit can be tilted to form curved wellbore sections, but this results in uneven boreholes, increased stress and vibrations on mud motor components, and high friction between the drilling assembly and wellbore
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed bend (AKO) with a dynamic deflection device that can self-adjust its tilt angle. The deflection device includes a lower section that can tilt relative to an upper section, allowing the drilling assembly to adapt its configuration dynamically. This dynamic adjustment capability enables the system to drill curved sections when needed while reducing stress and friction by straightening when appropriate, thus resolving the contradiction between adaptability and reliability.
2Reliability
If the bend angle of the AKO is reduced to reduce stresses on drilling assembly components, then stress and vibrations on mud motor components are reduced, but the maximum build rate is reduced and additional time and expenses are required to drill wellbores
Solution Approach 1:
The patent applies the parameter changes principle by enabling the deflection device to vary its tilt angle dynamically rather than using a fixed bend angle. The deflection device can adjust its configuration parameter (tilt angle) based on drilling conditions, allowing the system to achieve high build rates when necessary while maintaining component reliability. This resolves the contradiction by making the bend angle a variable parameter rather than a fixed value.
3Adaptability or versatility
If a fixed bend (AKO) is used to drill curved sections, then directional drilling capability is achieved, but the bending contact between the drilling assembly and wellbore creates high friction
Solution Approach 1:
The patent applies the dynamics principle by using a deflection device with a lower section that can tilt relative to an upper section, replacing the static fixed bend. This dynamic configuration allows the drilling assembly to minimize contact friction with the wellbore while maintaining directional drilling capability. The lower section can adjust its position to reduce bending contact, thereby reducing friction forces while preserving the ability to drill curved sections.
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 solution reduces wellbore spiraling, stress on drilling assembly components, and friction, allowing for efficient drilling of both curved and straight sections with improved directional control and reduced operational costs.
Implementation Method 1
The deflection device includes a seal to isolate a lubricant from external pressure and drilling fluid
Data Source
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AI summary
An apparatus for drilling directional wellbores is disclosed that in one non-limiting embodiment incudes a drive for rotating a drill bit, a deflection device that enables a lower section of a drilling assembly to tilt about a member of the deflection device within a selected plane when the drilling assembly is substantially rotationally stationary to allow drilling of a curved section of the wellbore when the drill bit is rotated by the drive and wherein the tilt is reduced when the drilling assembly is rotated to allow drilling of a straighter section of the wellbore, and at least one seal that isolates at least a surface of the member from outside environment. The at least one seal is lubricated by a sealed hydraulic unit