Compression-Set Straddle Packer with Fluid Pressure Boost
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Solution Overview
Problem
Existing straddle packers for wellbore pressure isolation are unreliable and costly due to operational complexities, necessitating a novel compression-set straddle packer with fluid pressure-boosted capabilities for reliable downhole operation.
Innovation Solution
A compression-set straddle packer design featuring a two-part multicomponent mandrel with a bias element chamber, upper and lower packer elements, and a mandrel flow sub with nozzles, where high-pressure fluid boosts packer element compression and maintains pressure equality between elements, utilizing a bias element to resist movement and distribute compression pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional straddle packers are used for wellbore pressure isolation, then the basic function of isolating downhole areas is achieved, but operational reliability deteriorates due to frequent operational issues and complexity
Solution Approach 1:
The packer tool is divided into multiple functional segments including a compression sleeve with bias elements, a mandrel with flow sub, and separate upper and lower packer elements. This segmentation allows each component to perform its specific function independently, improving overall reliability while managing complexity through modular design
Solution Approach 2:
High-pressure fluid is pumped through the mandrel flow sub to activate the compression mechanism. The hydraulic pressure drives the compression sleeve to compress the bias elements, which in turn compress the packer elements against the wellbore. This hydraulic activation replaces complex mechanical setting mechanisms, improving reliability
2Strength
If conventional straddle packers are used for wellbore pressure isolation, then the basic sealing function is achieved, but seal strength deteriorates due to insufficient compression pressure
Solution Approach 1:
High-pressure fluid pumped through the mandrel flow sub creates hydraulic pressure that activates the compression sleeve. This hydraulic mechanism delivers high compression force to the packer elements, ensuring strong sealing against the wellbore without requiring overly complex mechanical compression systems
Solution Approach 2:
The bias elements are pre-compressed between the compression sleeve and the mandrel, creating a constant counteracting force. This pre-compression ensures that the packer elements maintain constant contact with the wellbore, enhancing seal strength while simplifying the overall compression mechanism
3Measurement precision
If conventional straddle packers are used for precision well stimulation, then basic pressure isolation is achieved, but precision deteriorates due to uneven pressure distribution between packer elements
Solution Approach 1:
The bias elements act as intermediary components between the hydraulic compression system and the packer elements. They transmit and equalize the compression force uniformly to both upper and lower packer elements, ensuring precise pressure isolation. The flow sub serves as an intermediary to distribute hydraulic pressure evenly throughout the system
Solution Approach 2:
The compression sleeve and bias element arrangement ensures that pressure is equally distributed to both upper and lower packer elements. This equipotential pressure distribution eliminates pressure imbalances, improving the precision of pressure isolation for targeted well stimulation
4Reliability
If conventional straddle packers are used for downhole operation, then basic functionality is achieved, but maintenance cost deteriorates due to expensive building and maintenance requirements
Solution Approach 1:
The packer is designed as a modular tool with separable components including the mandrel, compression sleeve, bias elements, and packer elements. This segmentation allows for easier manufacturing of individual components and simplifies maintenance by enabling replacement of worn parts without replacing the entire tool, reducing overall cost
Solution Approach 2:
The bias elements are pre-compressed during assembly to provide automatic constant contact between packer elements and the wellbore. This self-adjusting mechanism eliminates the need for complex active control systems, reducing manufacturing cost while maintaining high operational reliability
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 solution provides reliable and efficient wellbore pressure isolation with enhanced seal strength and operational reliability, reducing maintenance costs and improving precision in well stimulation and remediation treatments.
Implementation Method 1
a bias element constantly resisting movement of the upper part of the two-part multicomponent mandrel with respect to the two-part transition sleeve
Implementation Method 2
when high pressure fluid is pumped into the straddle packer, the high-pressure fluid exits the at least one flow sub nozzle and flows through the packer element piston ports into the packer element piston chamber to urge the uphole end of the two-part packer element compression sleeve against the lower packer element to pressure-boost the lower packer element set
Data Source
AI summary
A compression-set straddle packer with fluid pressure-boosted packer set has a two-part multicomponent mandrel and a multicomponent sliding sleeve that reciprocates within a limited range on an upper part of the two-part multicomponent mandrel. A two-part lower packer element compression sleeve in a lower part of the two-part multicomponent mandrel reciprocates on a packer element piston mandrel component and pressure-boosts compression of a lower packer element when high-pressure fluid is pumped into the straddle packer. A bias element constantly resists relative movement between the multicomponent mandrel and the multicomponent sliding sleeve and balances pressure-boost between the lower packer element and an upper packer element supported by the upper part of the two-part multicomponent mandrel.