Spring-Loaded Drilling Stabilizer for Mud Cake Release
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Solution Overview
Problem
Existing stabilizing systems in deep drilling face challenges with mud cake formation, leading to increased rotary torque, reduced penetration rates, and difficulties in pulling-out-of-hole (POOH) and running-in-hole (RIH) operations due to mud cake adhesion, which current methods like increasing water flow or mechanical shaking are either costly or ineffective.
Innovation Solution
A stabilizing system with a longitudinal housing and a helical spring that contracts and expands along the longitudinal axis in response to drilling forces, altering its transverse diameter to break off mud cakes, utilizing drilling forces to facilitate smooth POOH and RIH operations without additional energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stabilizer blades are fixed to the drill string to center it in the bore hole, then drilling direction stability is improved, but mud cake accumulates between the blades causing balling
Solution Approach 1:
The stabilizer system transitions from a static fixed-blade design to a dynamic adjustable design where blades can move radially inward and outward. During drilling, blades extend outward to provide stabilization. During POOH/RIH operations, blades retract inward to prevent mud cake accumulation and reduce drag, eliminating the balling problem while maintaining drilling direction stability when needed.
Solution Approach 2:
The stabilizer blade configuration changes its geometric parameters dynamically - specifically the radial position of the blades is adjusted between extended and retracted positions. This parameter change allows the stabilizer to adapt its surface area and shape to different operational requirements, preventing mud cake formation during retrieval operations while maintaining centering capability during drilling.
2Reliability
If mud cake accumulates between stabilizer blades, then balling occurs, but POOH and RIH operations become difficult and time-consuming
Solution Approach 1:
The stabilizer system dynamically adjusts blade position based on operational phase. During POOH/RIH operations, blades retract to minimize surface area contact with the bore hole wall, preventing mud cake accumulation and eliminating the need for time-consuming unballing operations, thereby reducing total operation time while maintaining stabilizer reliability when blades are extended during drilling.
3Object-generated harmful factors
If water flow rate is increased to remove mud cake, then balling is reduced, but drilling cost and energy consumption increase
Solution Approach 1:
The stabilizer system performs self-service by automatically preventing mud cake accumulation through mechanical blade retraction, eliminating the need for additional water flow or chemical treatments. The system uses the existing drilling operation mechanics to prevent balling without requiring extra energy input for water pumping or specialized fluids.
4Object-generated harmful factors
If special coating is applied to prevent balling, then mud cake adhesion is reduced, but equipment cost increases and coating is suitable for one-time use only
Solution Approach 1:
Instead of relying on consumable coatings that require reapplication, the stabilizer uses a mechanical dynamic solution where blades retract to prevent mud cake formation. This permanent mechanical feature eliminates the need for special coatings, reducing manufacturing costs and eliminating the need for one-time use limitations.
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 reduces the risk of jamming by alternately increasing and decreasing the transverse diameter, allowing for efficient and reliable removal of mud cakes, thereby improving the ease and speed of POOH and RIH operations.
Implementation Method 1
a spring (140) which is arranged inside the housing (110)... the stabilizing system is contracted and the spring (140) is compressed along the longitudinal axis of the stabilizing system when an external load is applied in longitudinal direction onto the stabilizing system
Implementation Method 2
the spring (140) is adapted to push the stabilizing system to expand along the longitudinal axis when the external load is released
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a stabilizing system (100) adapted to be used in a deep drilling system. The stabilizing system (100) comprises a longitudinal housing (110) and a spring (140) preferably a helical spring, arranged inside the housing (110). Thereby, the stabilizing system (100) is contracted and the spring (140) is compressed along the longitudinal axis of the stabilizing system (100) when an external load is applied in longitudinal direction onto the stabilizing system (100). The transversal diameter of the stabilizing system (100) increases when the stabilizing system (100) is contracted. Further, the transversal diameter of the stabilizing system (100) decreases when the stabilizing system (100) expands along the longitudinal axis.