Coiled Tubing Perforation With Optical Fiber Control
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Solution Overview
Problem
Current perforating operations in wellbores, especially in deviated and extended reach wellbores, face challenges with heavy coiled tubing systems and lack of precise control over perforating gun sections, leading to inefficiencies and increased weight, which limits reach and reliability.
Innovation Solution
A system utilizing coiled tubing with individually controllable perforating gun sections and an optical fiber for signal delivery, enabling sequential firing of perforating gun sections through addressable switch technology and microprocessor control, reducing weight and improving reach and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional heavy coiled tubing systems are used for perforating operations in deviated wellbores, then the system has sufficient strength and stability, but the weight increases which limits reach and increases operational complexity
Solution Approach 1:
The perforating gun assembly is divided into multiple individually controllable gun strings, each capable of being fired independently. This segmentation allows the system to achieve complex perforation patterns without requiring a single heavy, all-inclusive gun assembly, thereby reducing overall system weight while maintaining functional reliability.
Solution Approach 2:
The coiled tubing system is designed to perform multiple functions: it serves as both the deployment mechanism for the perforating gun assembly and as the conduit for delivering control signals and power to individually addressable gun strings. This multi-functionality eliminates the need for separate heavy-duty control systems, reducing overall system weight while maintaining operational reliability.
2Measurement precision
If traditional perforating gun assemblies with collective firing control are used, then the device complexity is lower, but the manufacturing precision and control precision are insufficient for selective perforation of specific well zones
Solution Approach 1:
The perforating gun assembly is divided into multiple individually addressable gun strings with unique identifiers. Each gun string can be selectively fired based on precise depth positioning and well zone requirements. This segmentation enables high control precision for selective perforation while managing complexity through modular design and systematic addressing.
Solution Approach 2:
The system incorporates depth positioning feedback and well zone identification capabilities that allow the control system to selectively activate specific gun strings based on real-time positional information. This feedback mechanism ensures precise control over which zones are perforated while maintaining manageable system complexity through automated decision-making algorithms.
3Measurement precision
If multiple trips into the well are performed for different perforation zones, then the control precision for specific zones is improved, but the loss of time and productivity decrease
Solution Approach 1:
The perforating gun assembly is divided into multiple individually controllable gun strings that can be selectively fired from a single deployment. This segmentation allows all required zone perforations to be accomplished in one trip by simply activating different gun strings at appropriate depths, eliminating the need for multiple trips while maintaining precise zone targeting capability.
Solution Approach 2:
All gun strings are pre-positioned and pre-configured within the perforating assembly before deployment. The system is prepared in advance to fire specific gun strings at specific depths, allowing multiple zones to be perforated in a single operation without requiring repeated trips into the well, thereby maximizing productivity while maintaining precision.
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 minimizes trips into the well, provides repeatable and reliable perforation, and is impervious to changing wellbore environments, enabling efficient perforation of non-contiguous well zones with reduced weight and increased reach.
Implementation Method 1
An optical fiber is deployed along the coiled tubing to deliver control signals to the perforating gun assembly
Implementation Method 2
perforating gun assembly has a plurality of individually controllable perforating gun sections which may be selectively fired at different well zones
Implementation Method 3
Perforating guns are deployed downhole and carry charges which are detonated and fired to create radially extending perforations
Data Source
AI summary
A technique facilitates performance of a perforating operation in a wellbore. The technique comprises positioning a perforating gun assembly downhole in a wellbore via coiled tubing. The perforating gun assembly has a plurality of individually controllable perforating gun sections which may be selectively fired at different well zones. An optical fiber is deployed along the coiled tubing to deliver control signals to the perforating gun assembly. The control signals enable sequential firing of the individually controllable perforating gun sections at the desired locations, e.g. well zones, along the wellbore.