Formation Tags for Wellbore Tool Positioning Accuracy
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Solution Overview
Problem
Conventional depth measurement systems for wellbore tools in oilfield drilling are inaccurate due to conveyance device elongation, leading to positioning errors of up to several meters, which is critical when targeting narrow hydrocarbon-bearing zones.
Innovation Solution
The use of tags embedded in the subterranean formation as reference objects, detectable by tag detection devices, to accurately position wellbore tools by emitting identifiable signals and providing precise location data, allowing for precise placement of tools relative to specific formations or features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional surface-based depth measurement systems are used, then the measurement system is simple and cost-effective, but the positioning accuracy deteriorates due to conveyance device elongation errors of several meters
Solution Approach 1:
The patent introduces tags as intermediary reference objects embedded in the formation to mediate between the wellbore tool and the formation. These tags provide stable, known positions that do not suffer from conveyance device elongation, enabling accurate positioning without requiring complex real-time measurement systems.
Solution Approach 2:
The patent applies preliminary action by pre-positioning tags in the formation at known locations before the wellbore tool arrives. This allows the tool to reference pre-established points rather than relying on potentially inaccurate real-time depth measurements from the surface.
2Measurement precision
If tags embedded in the formation are used as reference objects, then positioning accuracy is improved to within meter tolerance, but the device complexity increases due to tag insertion and detection equipment
Solution Approach 1:
The patent applies self-service by enabling the wellbore tool to detect and utilize the tags autonomously during normal operations. The tag detection device automatically identifies tag positions and provides positioning information without requiring external intervention or complex manual measurement procedures.
Solution Approach 2:
The tags serve multiple functions: they act as reference points for positioning, provide formation identification, and can be used for various wellbore operations including drilling, completion, and workover. This multi-functionality justifies the added complexity by providing versatile utility across different operations.
Data Source
AI summary
A system for positioning a wellbore tool in a wellbore intersecting a subterranean formation includes a tag embedded in the formation using a tag insertion device. The tag may be configured to transmit a signal that includes information. A wellbore tool may utilize a tag detection device to operatively link with the tag. This operative link may provide an indication of the relative position of the tag detection device or some other information.