Downhole NMR Logging Control for Real-Time Formation Measurement
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Solution Overview
Problem
Existing nuclear magnetic resonance logging tools rely on cable transmission for data acquisition after drilling, which leads to inaccurate measurements due to changes in formation parameters caused by drilling fluids and cuttings, affecting oil and gas field mining operations.
Innovation Solution
A main control system and device for a nuclear magnetic resonance logging while drilling tool, comprising a digital signal processor, auxiliary measurement module, pulse signal generation module, and memory integrated into a downhole drilling tool, allowing real-time data acquisition and transmission of echo signals to the surface, ensuring measurements reflect the newly drilled formation's parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cable transmission is used for logging after drilling, then the logging tool can be placed into the well to obtain data, but the measurement results become inaccurate due to formation parameter changes caused by drilling fluid invasion
Solution Approach 1:
The patent implements logging while drilling by performing measurements during the drilling process itself, before the formation parameters change due to drilling fluid invasion. The NMR logging tool is integrated into the drilling tool string, allowing preliminary action to be taken on the formation parameters before they are altered by the drilling process.
Solution Approach 2:
The patent replaces the traditional mechanical cable transmission system with wireless communication technology. The NMR logging tool communicates measurement data wirelessly to the surface through the drilling fluid column, eliminating the need for physical cable transmission and enabling real-time data acquisition during drilling operations.
2Reliability
If logging is performed after drilling completion, then the logging tool can access the well, but the formation parameters differ from the original state due to drilling fluid invasion
Solution Approach 1:
The patent merges the NMR logging tool with the drilling tool string, combining two previously separate operations (drilling and logging) into a single integrated system. This allows the logging tool to be deployed simultaneously with the drilling operation, ensuring measurements are taken on the original formation state without requiring separate post-drilling logging trips.
Solution Approach 2:
The patent uses the drilling fluid column as an intermediary medium for wireless communication. The NMR logging tool transmits measurement data through the conductive drilling fluid to the surface, using the existing drilling fluid circulation system as a communication channel rather than requiring separate cable infrastructure.
3Measurement precision
If real-time data acquisition during drilling is implemented, then accurate formation parameters are obtained, but the system requires integration of multiple modules including digital signal processor, pulse signal generation, and memory
Solution Approach 1:
The patent implements a multi-functional main control system where the digital signal processor, pulse signal generation module, and memory work together as an integrated control unit. This universal control system manages multiple functions including pulse generation, signal reception, data processing, and wireless transmission, reducing the need for separate dedicated systems for each function.
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
This approach provides more accurate formation parameter measurements by allowing the logging tool to collect data in real-time during drilling, closely representing the original formation state, thus improving the accuracy of oil and gas field assessments.
Implementation Method 1
a pulse signal generation module (4), for transmitting a pulse signal and collecting an echo signal generated by excitation of the pulse signal in the underground formation
Implementation Method 2
the digital signal processor is further configured to acquire the echo signal from the memory according to a signal acquisition instruction sent by the upper computer and return to the upper computer
Data Source
AI summary
Provided are a main control system and a device for a nuclear magnetic resonance logging while drilling tool, the system includes: a digital signal processor, an auxiliary measurement module, a pulse signal generation module and a memory disposed in a downhole drilling tool; wherein the digital signal processor is communicatively connected to an upper computer arranged on the ground, the auxiliary measurement module and the pulse signal generation module respectively; the memory is communicatively connected to the pulse signal generation module. The main control system and a device for a nuclear magnetic resonance logging while drilling tool achieve the effect of improving the accuracy of the logging data.