Steerable Drilling Device Non-Rotating Sensor Housing
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Solution Overview
Problem
Existing steerable drilling devices face challenges such as high risk in downhole operations due to component instability, fatigue from repeated bending, and unreliable electrical connections, especially when drilling in horizontal or inclined wells.
Innovation Solution
A steerable drilling device with a rotating outer tube, a joint drive mechanism that swings the drill bit joint without bending, and a stable electrical connection system using a circuit system and attitude sensor, allowing for accurate orientation and reduced structural stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pushing-type steerable device uses a pushing piston to change drill bit direction, then the drilling direction can be changed, but the drilling column cannot rotate and the operation risk increases
Solution Approach 1:
Instead of pushing the drill bit against the well wall to change direction, this invention allows the drilling column to rotate freely and uses a directing mechanism to guide the drill bit direction, inverting the traditional pushing approach to a guiding approach that enables both rotation and directional control
Solution Approach 2:
The invention introduces a dynamic directing mechanism that can adjust the drill bit direction while the drilling column rotates, making the system adaptable to both rotational motion and directional changes without compromising safety
2Ease of operation
If the pushing piston stroke is controlled only by driving force, then the control method is simple, but the deflecting effect depends heavily on formation conditions
Solution Approach 1:
The invention incorporates sensors that detect the actual drill bit direction and provide feedback to the control system, enabling closed-loop control that adjusts the directing mechanism to achieve precise deflecting effects independent of formation conditions
3Ease of operation
If the housing and central shaft are bent repeatedly to change direction, then the drill bit position can be adjusted, but fatigue damage occurs and safety is affected
Solution Approach 1:
The invention separates the directional control function from the structural housing and central shaft by introducing a独立的 directing mechanism, allowing direction changes without repeatedly bending the main structural components, thus avoiding fatigue damage
4Productivity
If the drill column rotates to maintain drilling direction, then the drilling can continue, but the electrical connection stability deteriorates
Solution Approach 1:
The invention introduces a non-rotating intermediary structure that houses the sensors and electrical connections, allowing the drill column to rotate while the sensing and control systems remain stationary, thus maintaining electrical connection stability during continuous drilling operations
Data Source
AI summary
A steerable drilling device has an outer tube extending along a longitudinal axis; a drill bit joint inserted into said outer tube, a lower end of said drill bit joint extending out of a lower end of said outer tube for connection to a drill bit; a joint drive mechanism, provided in said outer tube and configured to drive said drill bit joint to swing relative to the longitudinal axis; and a lower connection mechanism. The lower connection mechanism has a connection body connected to said joint drive mechanism in such a manner that said joint drive mechanism is non-rotatable with respect to said connection body, a first centralizer arranged between said connection body and said outer tube, a circuit system arranged in said connection body and configured to provide an electrical signal to said joint driving mechanism, and an attitude sensor arranged in said connection body.