Downhole Drill String Vibration Device for Drilling Speed
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Solution Overview
Problem
Existing methods for improving drilling fluid injection pressure at the shaft bottom face challenges such as complex tool structures, increased pressure loss with well depth, vibration coupling, pressure drops, and costly specialized flow channels, leading to safety concerns and reduced drilling efficiency.
Innovation Solution
A system utilizing a downhole drill string vibration-reduction and supercharging device with an ultra-high pressure bit, featuring a high-pressure flow channel, hose, and rigid tube, along with a power conversion unit that harnesses bit pressure fluctuations to generate ultra-high pressure jets for rock cracking, ensuring stable and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but the tool structure becomes complicated and working life cannot be ensured
Solution Approach 1:
The system divides the drilling fluid flow into two separate channels: a main flow channel for normal drilling operations and an ultra-high pressure flow channel for rock cracking. This segmentation allows each channel to be optimized independently, simplifying the overall structure while maintaining high drilling speed through targeted ultra-high pressure injection.
Solution Approach 2:
The drilling bit is designed with dual functionality: it can perform normal drilling through the main flow channel and simultaneously create ultra-high pressure jets through the specialized flow channel. This multi-functionality eliminates the need for separate specialized tools, reducing structural complexity while improving drilling speed.
2Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but pressure loss increases with well depth
Solution Approach 1:
The system applies ultra-high pressure drilling fluid injection locally at specific rock fracture points rather than uniformly throughout the entire drilling fluid circulation system. This localized application minimizes overall pressure loss while achieving the desired rock cracking effect to improve drilling speed.
Solution Approach 2:
Only a small portion of the drilling fluid (5-10%) is diverted to the ultra-high pressure flow channel, while the majority continues through the main channel. This partial action approach reduces the overall pressure loss in the system while still achieving effective rock cracking to improve drilling speed.
3Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but coupling phenomenon occurs between impact vibration and inherent vibration of drilling string
Solution Approach 1:
The system extracts and isolates the vibration-generating ultra-high pressure injection process into a separate, controlled flow channel. By separating this high-impact function from the main drilling string vibration, the coupling between impact vibration and inherent drilling string vibration is reduced, improving overall vibration stability while maintaining drilling speed improvement.
4Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but pressure drop adds working load to rotary system
Solution Approach 1:
The system introduces a high-pressure resisting hose as an intermediary element that can flexibly accommodate pressure variations and absorb shocks. This intermediary component protects the rotary system from excessive working load while still enabling ultra-high pressure injection to improve drilling speed.
5Productivity
If specialized flow channels are formed into drilling bit matrix, then ultra-high pressure injection is achieved, but manufacturing cost increases and spread application is influenced
Solution Approach 1:
The system uses a dynamic, flexible high-pressure resisting hose instead of a fixed, rigid flow channel embedded in the bit matrix. This dynamic component can be easily installed and removed, reducing manufacturing costs and enabling wider spread application across different drilling operations while still achieving ultra-high pressure injection for improved drilling speed.
6Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but connection of ultra-high pressure flow channel may fail due to excessive axial force or misalignment
Solution Approach 1:
The system employs a flexible high-pressure resisting hose instead of rigid piping for the ultra-high pressure flow channel. This flexible hose can accommodate axial forces and misalignments without failing, significantly improving connection reliability while maintaining the ultra-high pressure injection capability needed for improved drilling speed.
7Productivity
If specialized tools are used to improve drilling fluid injection pressure at the shaft bottom, then drilling speed is improved, but torque on ultra-high pressure flow channel may damage connection portion
Solution Approach 1:
The flexible high-pressure resisting hose is designed to be torque-resistant while maintaining flexibility. This flexible component can withstand the torque generated during drilling operations without damaging the connection portion, ensuring both improved drilling speed through ultra-high pressure injection and maintained connection strength.
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 system effectively enhances drilling speed by improving injection pressure and reducing adverse bit pressure fluctuations, ensuring safer and more efficient drilling operations, with the ability to increase drilling rates by 1-5 times compared to conventional methods.
Implementation Method 1
a spring (4), an upper plugging joint (2) of the spring (4), an upper transition joint (1)
Implementation Method 2
an ultra-high pressure drilling fluid nozzle (31)
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
A system for improving a drilling speed by using drill string vibration comprises a downhole drill string vibration-reduction and supercharging device, and an ultra-high pressure bit device used for a downhole supercharger. The downhole drill string vibration-reduction and supercharging device comprises a high-pressure runner (16). The ultra-high pressure bit device used for the downhole supercharger comprises an ultra-high pressure drilling fluid transmission runner. The ultra-high pressure drilling fluid transmission runner comprises an ultra-high pressure drilling fluid runner (25), a high-pressure resisting hose (28) and a high-pressure resisting rigid tube (30). The high-pressure runner (16) is connected to the ultra-high pressure drilling fluid runner (25); an end of the high-pressure resisting hose (28) is connected to the ultra-high pressure drilling fluid runner (25), and the other end of the high-pressure resisting hose (28) is connected to the high-pressure resisting rigid tube (30); and the other end of the high-pressure resisting rigid tube (30) is connected to an ultra-high pressure drilling fluid nozzle (31). Also disclosed is a method for improving a drilling speed by using drill string vibration. The system structure is stable and reliable. Meanwhile, the power source in the method is the bit pressure fluctuation at the shaft bottom during drilling, and the injection pressure of the drilling fluid at the shaft bottom is improved by using energy obtained due to decrease of the bit pressure fluctuation. The adverse effect of the bit pressure fluctuation on the drilling procedure is reduced, which ensures construction safety and improves injection pressure of the drilling fluid at the shaft bottom, thereby improving the drilling speed.