Downhole Perforation Control System with Bidirectional Feedback
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Solution Overview
Problem
Existing selective fired gun systems for perforating wells face issues such as mechanical and electrical failures, premature arming, and lack of feedback on perforating results, especially when dealing with multiple non-continuous hydrocarbon-bearing formations, leading to incomplete or non-productive well completions.
Innovation Solution
A system enabling bidirectional communication between a surface controller and downhole devices, allowing for individual addressing and operational feedback without requiring each device to communicate over long distances, using a surface controller, downhole controller, and downhole remote units with unique addresses, and sensors to detect detonation intensity for quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individually addressable downhole control units are used to communicate with the surface system, then selective firing capability is improved, but communication reliability deteriorates due to long distance transmission
Solution Approach 1:
The patent introduces an intermediary communication system consisting of surface receivers and downhole transmitters that relay commands and status information between the surface control unit and downhole control units. This intermediary layer extends the communication range beyond direct line-of-sight limitations while maintaining communication reliability through localized transmission hops.
Solution Approach 2:
The communication system is segmented into multiple independent communication channels: surface control unit to surface receivers, surface receivers to downhole transmitters, and downhole transmitters to downhole control units. This segmentation allows each segment to operate independently over shorter distances, improving overall system reliability while maintaining selective addressing capability.
2Adaptability or versatility
If mechanical and electrical techniques are used for sequential gun activation, then selective firing is achieved, but system reliability deteriorates due to mechanical failures and switch failures
Solution Approach 1:
The patent replaces mechanical switching systems and electrical sequential activation with a programmable microprocessor-based control system. The surface control unit and downhole control units use software-controlled timing and addressing to select which guns fire, eliminating mechanical wear, switch failures, and electrical contact issues while maintaining selective firing capability.
Solution Approach 2:
The downhole control units are equipped with microprocessors that autonomously determine which guns to fire based on received commands and pre-programmed well completion data. Each downhole control unit independently manages its associated guns without requiring mechanical switches or complex electrical sequencing from the surface, improving reliability through distributed intelligence.
3Adaptability or versatility
If downhole control units communicate individually with the surface system, then addressing capability is improved, but feedback capability deteriorates due to lack of quality information
Solution Approach 1:
The patent implements a feedback system where downhole control units transmit status information and quality data back to the surface control unit after firing events. Sensors detect parameters such as detonation intensity, gun firing status, and wellbore conditions, providing real-time feedback that confirms successful perforation or identifies issues requiring attention.
Solution Approach 2:
The communication system is designed to handle multiple functions: sending firing commands, transmitting well completion data, reporting status information, and providing quality feedback all through the same bidirectional communication channels. This multi-functionality eliminates the need for separate feedback systems while maintaining comprehensive addressing capability.
4Productivity
If a single trip perforation system is used for multiple zones, then productivity is improved, but complexity increases due to need for selective activation of multiple guns
Solution Approach 1:
The downhole control units contain microprocessors that automatically manage the complex sequencing and selection of guns to fire based on pre-programmed well completion plans. The system self-manages the complexity of coordinating multiple guns across different zones without requiring complex surface equipment or manual intervention, enabling single-trip multi-zone perforation while keeping surface operations simple.
Data Source
AI summary
A system (100) for selective activation of explosive devices (126, 128, 130, 132) includes a surface controller (102), a downhole controller (106) operable to communicate bidirectionally with the surface controller over a first communication link (108) and a plurality of downhole remote units (114, 116, 118, 120) operable to communicate bidirectionally with the downhole controller (106) over a second communication link (112). One or more sensors (162) are operably associated with the downhole controller (106) and one of the explosive devices (126, 128, 130, 132) is operably associated with each of the downhole remote units (114, 116, 118, 120) such that, responsive to a detonation event, the sensors (162) detect the intensity level of the detonation which is communicated from the downhole controller (106) to the surface control (102) over the first communication link (108).