Double-Channel Fluid Injection Apparatus Sealing
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Solution Overview
Problem
Existing double-channel fluid injection apparatuses for aerated drilling with double-walled drill pipes suffer from non-adjustable sealing interference, short sealing life, and low safety in well control, restricting the development of the aerated drilling technique.
Innovation Solution
A double-channel fluid injection apparatus with a main shaft, bearing box, and sealing box, featuring a cylindrical outer tube and round inner tube with adjustable sealing interference through hydraulic medium pressure control, and V-shaped combined sealing rings to enhance rotational torque and pressure-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing structures are used in the double-channel fluid injection apparatus, then the device complexity is reduced, but the sealing life and pressure-bearing level are insufficient
Solution Approach 1:
The patent employs dynamic sealing elements including V-shaped combined sealing rings and adjustable sealing interference mechanisms that can adapt to varying pressure conditions. The sealing structure includes movable components that respond to pressure changes, transforming static sealing into dynamic sealing to extend sealing life under high pressure conditions
Solution Approach 2:
The patent implements adjustable sealing interference parameters through hydraulic medium pressure control. The sealing interference can be adjusted by changing pressure parameters, allowing the sealing system to optimize its performance under different operating conditions, thereby extending sealing life without fundamentally changing the structure
2Reliability
If fixed sealing interference is applied, then the device complexity is minimized, but the sealing life and well control safety are reduced
Solution Approach 1:
The patent transforms fixed sealing interference into adjustable sealing interference through dynamic mechanisms. The sealing system can be adjusted during operation to maintain optimal sealing performance under varying well control conditions, improving safety without requiring completely redundant sealing systems
Solution Approach 2:
The patent utilizes hydraulic medium pressure to control and adjust the sealing interference. By introducing hydraulic actuation, the sealing parameters become controllable and adjustable, allowing remote adjustment of sealing force to respond to well control situations without mechanical complexity at the sealing location
3Strength
If simple sealing rings are used, then the manufacturing cost and device complexity are reduced, but the rotational torque and pressure-bearing capacity are insufficient
Solution Approach 1:
The patent employs V-shaped combined sealing rings that combine different material properties and geometric features. The V-shape geometry combined with appropriate material selection creates a composite sealing element that achieves high pressure-bearing capacity and rotational torque resistance without requiring multiple separate components
Solution Approach 2:
The V-shaped geometry of the sealing rings utilizes curved surfaces to distribute contact stresses and improve pressure-bearing capacity. The angular V-shape provides mechanical advantage for withstanding rotational torque while maintaining sealing contact under pressure
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 apparatus improves sealing life and pressure-bearing level by adjusting sealing interference and rotational torque, ensuring reliable well control and safety even under high pressure conditions.
Implementation Method 1
V-shaped combined sealing rings to enhance rotational torque and pressure-bearing capacity
Implementation Method 2
adjustable sealing interference through hydraulic medium pressure control
Data Source
AI summary
A double-channel fluid injection apparatus includes a main shaft, a bearing box, and a sealing box. The main shaft includes an outer tube and an inner tube. An internal channel of the inner tube and a vertical through channel constitute a first fluid passageway. The inner tube and the outer tube form an annular gap, and a channel D is radially formed at a lower part of the outer tube and is in communication with the annular gap, thus constituting a second fluid passageway. The bearing box is mounted on a boss of the outer tube. The sealing box includes a sealing cylinder fixedly connected to a lower end of a lower end cap of the bearing box. A channel E in communication with the second fluid passageway is radially formed at a position of the sealing cylinder corresponding to the channel of the outer tube.