Dual Expandable Liner Cementing Device for Wellbore Sealing
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Solution Overview
Problem
Current cementing techniques in wellbore casing fail to provide long-term sealing and durability due to defects such as crack formation and loss of adhesion, leading to gas and fluid leaks under high pressures.
Innovation Solution
A cementing device with a structure featuring two expandable jackets that expand to seal against the wellbore wall, providing a robust and leak-tight seal, supporting the cement during solidification and preventing fluid/gas rise, even in the event of inner liner collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single expandable liner is used for cementing, then the device complexity is reduced, but the sealing reliability deteriorates due to potential collapse and loss of adhesion over time
Solution Approach 1:
The patent implements a nested dual-liner structure where an inner expandable liner is positioned within an outer expandable liner. Both liners can expand independently to seal against the wellbore wall, creating redundant sealing paths. The inner liner provides primary sealing support during cementation, while the outer liner provides backup sealing and structural support, preventing collapse and maintaining adhesion over time.
Solution Approach 2:
The patent incorporates a compressible buffer element positioned between the inner and outer liners. This buffer element provides beforehand cushioning by absorbing differential expansion forces and preventing mechanical interference between the two liners during the expansion process. It also compensates for manufacturing tolerances and wellbore irregularities, ensuring both liners can expand uniformly without compromising sealing reliability.
2Reliability
If the expandable liner is kept expanded under pressure during cementation, then the sealing performance is improved, but pressure leakage problems occur
Solution Approach 1:
The patent segments the sealing function into two independent expandable liners with separate expansion control. The inner liner can be expanded first to provide the primary seal, then the outer liner is expanded to provide a secondary seal and structural support. This segmentation allows the system to achieve superior sealing performance without requiring excessive pressure on a single liner, thereby preventing pressure leakage and material failure.
3Strength
If a robust single-liner structure is used to prevent collapse, then the structural strength is improved, but the ability to provide optimal sealing during cementation deteriorates
Solution Approach 1:
The nested dual-liner configuration allows the inner liner to be optimized for sealing performance with thinner, more compliant walls that can conform to wellbore irregularities. The outer liner is optimized for structural strength with thicker walls to prevent collapse. Both liners work together, with the inner liner providing the primary seal against the wellbore wall and the outer liner providing structural support and a secondary seal, thereby achieving both optimal sealing quality and structural strength.
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
Ensures long-term sealing and durability by maintaining insulation and preventing fluid/gas ascent, eliminating pressure leakage issues and supporting cement during both solidification and severe conditions.
Implementation Method 1
this first outer liner being capable of expanding and coming, over an intermediate portion of its length, a second expandable liner
Implementation Method 2
sealing means disposed inside the pipe that control the opening and closing of at least one cementing opening
Data Source
Figure 1
Figure 2A~2E
Figure 3A~3E
AI summary
The invention relates to a device (1) for cementing a pipe (2) in a borehole well (A), comprising: - on the side of the head of the well (A), plugging means (11) arranged on the inside of the pipe (2) and which control the opening and closure of at least one cementation opening (111), the said at least one cementation opening (111) causing the inside of the pipe (2) to communicate with the annular space (3) situated between the external face of the pipe (2) and the interior wall of the well (A), - on the side of the bottom of the well (A), an isolation device (12) comprising two expandable sleeves (122, 124), which device is mounted along the external face of the pipe (2), and - at least one communication passage (125) for communication between the outside of the first external sleeve (122) and the said annular volume (E), the said at least one communication passage (125) being situated on the side of the isolation device (12) facing toward the bottom of the well (A).