Drilling Assembly With Hinge Module For Ultra-Small Holes
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Solution Overview
Problem
Existing drilling devices fail to optimize the performance of hydraulic downhole motors and effectively transport cuttings in ultra-small diameter and curvature radius holes, leading to inefficiencies and potential clogging of hole walls.
Innovation Solution
A packed-hole assembly with a small-sized hydraulic downhole motor and a rotation module that redistributes drilling fluid flow through tangentially-radially oriented nozzles, reducing hydrostatic pressure and creating a turbulent flow to enhance drilling efficiency and prevent clogging, using a joint-hinge module with skew angle units and centering ribs to maintain optimal alignment and rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drilling devices are used in ultra-small diameter holes, then the device structure is simple, but the hydraulic downhole motor performance cannot be optimized and cuttings transportation is ineffective
Solution Approach 1:
The drilling assembly is divided into functional modules: a rotation module with nozzles for fluid redistribution, a joint-hinge module with skew angle units for orientation control, and a downhole motor section. This segmentation allows each module to perform its specific function optimally while maintaining overall system manageability in ultra-small diameter holes
Solution Approach 2:
The joint-hinge module incorporates skew angle units that enable dynamic adjustment of the assembly's orientation angle relative to the hole axis. This dynamic capability allows the assembly to adapt to curved hole trajectories and maintain optimal drilling angle, improving productivity in deviated and horizontal holes
2Productivity
If drilling fluid flow is increased to improve cuttings transportation, then cuttings removal efficiency improves, but differential pressure increases causing bit seizure risk
Solution Approach 1:
The rotation module features nozzles with specific orientation angles (tangential and radial) that create localized high-velocity jets. These jets generate turbulent flow and vortex structures in specific regions to enhance cuttings lift without requiring a uniform increase in overall drilling fluid flow rate, thereby avoiding excessive differential pressure
Solution Approach 2:
The assembly utilizes hydraulic injection through strategically oriented nozzles to create turbulent flow patterns and vortex structures in the drilling fluid. This hydraulic action enhances cuttings suspension and transportation efficiency by exploiting fluid dynamics principles rather than simply increasing flow rate, thus managing differential pressure
3Adaptability or versatility
If downhole motor size is reduced to fit ultra-small diameter holes, then adaptability to small holes improves, but motor performance and drilling speed decrease
Solution Approach 1:
The joint-hinge module with skew angle units performs preliminary orientation adjustment of the drilling assembly before the bit engages the formation. This preliminary positioning ensures optimal alignment with the hole axis and curved trajectory, allowing the compact motor to operate at maximum efficiency from the start, compensating for its reduced size
Solution Approach 2:
The skew angle units enable change in the orientation parameter of the drilling assembly relative to the hole axis. By dynamically adjusting this angle parameter, the compact motor assembly can optimize its performance characteristics for different hole configurations, maintaining higher drilling speeds despite reduced motor size
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 solution improves the productivity, reliability, and safety of drilling in ultra-small diameter and curvature radius holes by optimizing hydraulic motor performance, enhancing cuttings transportation, and preventing bit seizure, allowing for faster and more efficient drilling with reduced risk of differential pressure issues.
Implementation Method 1
positive displacement motor with a skew angle unit at a deviation angle f
Implementation Method 2
decrease of differential (hydrostatic) pressure in bottom-hole zone of drilling bit operation using drilling fluid injection effect
Implementation Method 3
improving the ability of drilling cuttings transportation in the ultra-small diameter and curvature radius holes with a possibility of creating a turbulent flow
Implementation Method 4
decrease of differential (hydrostatic) pressure in bottom-hole zone of drilling bit operation using drilling fluid injection effect
Data Source
AI summary
The invention relates to the field of drilling. A packed-hole assembly comprises a drill bit, and a positive displacement motor having a bending unit for deviation by a tilt angle f, and further comprises a rotation module and a hinge module which are rigidly connected to one another, to drill pipes and to the motor by threaded connections. The rotation module consists of a fixed shaft with a central channel and axial openings for drilling fluid, and a rotating body with radial channels which is mounted on cageless rolling contact bearings such as to be capable of circular movement as a result of the reactive force of drilling fluid flowing into the annulus of the borehole through the axial openings in the shaft, the space between the shaft and the rotating body, and the radial channels in turn. The hinge module consists of two half bodies connected to one another by a hinge such as to be capable of rotating freely in an apsidal plane by an angle e=f, restricted by cams, wherein at least one half body is provided with centering ribs. The result is an increase in penetration rate and bit run rate.