Liner Hanger Top Packer Locking Mechanism
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Solution Overview
Problem
Liner hanger packers face challenges with premature base-hanging and base-sealing during descent, leading to reduced reliability and safety in well completion operations, especially in complex wells like ultra-deep, horizontal, and high-pressure wells.
Innovation Solution
A liner hanger top packer design featuring a locking mechanism with a steel ball and ball sockets, an elastic serrated thread, and gauge rings to prevent axial movement and allow controlled radial expansion of the plastic cylinder for effective sealing, along with a base-hanging mechanism that protects the components from damage during tripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer diameter of the plastic cylinder is made equal to that of the liner and locking sleeve to achieve effective packing, then the sealing performance is improved, but the apparatus is prone to damage and premature activation during descent
Solution Approach 1:
The packing element is divided into an inner plastic cylinder and an outer metal cylinder, allowing independent optimization of each component. The inner plastic cylinder maintains the sealing function while the outer metal cylinder provides mechanical protection during descent, preventing damage without compromising sealing effectiveness.
Solution Approach 2:
The outer metal cylinder acts as a protective cushion for the inner plastic cylinder during the descent process. This pre-established protective structure prevents direct contact and damage between the plastic cylinder and wellbore obstacles, eliminating the risk of premature activation while maintaining the integrity of the sealing mechanism.
2Reliability
If a locking mechanism is added to prevent premature activation during descent, then the safety is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is integrated into the existing dual-cylinder structure by utilizing the interaction between the inner plastic cylinder and outer metal cylinder. The ball socket and steel ball form a locking mechanism that is naturally incorporated into the assembly geometry, preventing premature activation without requiring separate complex locking components.
Solution Approach 2:
The locking mechanism operates automatically based on the relative movement between the inner and outer cylinders during descent. The steel ball naturally engages with the ball socket when the outer cylinder moves relative to the inner cylinder, providing self-locking functionality without requiring external control systems or additional actuation mechanisms.
3Reliability
If the plastic cylinder is made larger to improve sealing area, then the base-sealing performance is improved, but the risk of damage during tripping increases
Solution Approach 1:
The packing element uses a composite structure combining plastic and metal materials. The inner plastic cylinder provides the necessary sealing surface area and flexibility for effective base-sealing, while the outer metal cylinder provides high strength and damage resistance during tripping operations. This composite approach allows each material to contribute its advantageous properties to the overall system performance.
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 design enhances the reliability and safety of base-hanging and base-sealing operations by preventing premature activation and ensuring effective packing without component damage, thereby improving the success rate of well completion processes.
Implementation Method 1
When the base-sealing apparatus moves downward relative to the body, the steel ball falls into a ring slot in an outer surface of the body
Implementation Method 2
the locking sleeve moves downward to press the plastic cylinder so as to cause radial expansion of the latter
Data Source
Figure 1
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Figure 3
AI summary
A liner hanger top packer comprising a body (10) and, sleeved sequentially from top to bottom on the body, an adjusting sleeve (20), a retaining apparatus (30), a base-sealing apparatus (40), a base-hanging apparatus (50), and a locking mechanism (60) arranged between the base-sealing apparatus (40) and the base-hanging apparatus (50). The locking mechanism (60) comprises a locking ball sleeve (61), a ball socket (62), and a steel ball (63). During a descent process, as the lower part of the liner hanger top packer is met with friction, the arrangement of the steel ball (63) restricts relative axial movements between an upper gauge ring (41) of the base-sealing apparatus (40), the locking ball sleeve (61), and an upper conical body (51) of the base-hanging apparatus (50), therefore, the friction transmitted to the upper conical body (51) is not transmitted to a lower gauge ring (43) of the base-sealing apparatus (40), but is transmitted directly to the upper gauge ring (41) via the steel ball (63), and is further transmitted to the adjusting ring (20) via the retaining apparatus (30). As such, relative movements are not generated between the upper gauge ring (41) and the lower gauge ring (43), while a plastic cylinder (42) does not deform, thus preventing the possibility to premature base-sealing.