Pump-off Pressure Data Compression for Real-time Drilling Telemetry
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Solution Overview
Problem
The transmission of pump-off pressure data from wellbores to the surface is hindered by limited bandwidth in mud-pulse telemetry, leading to non-real-time data transmission and potential formation damage due to inadequate hydrostatic pressure management.
Innovation Solution
A method and system that utilize a downhole tool with a controller to select and apply compression protocols based on time length, relative mean-squared error, or maximum error of pump-off pressure data, compressing the data into compression bits, and transmitting them via a communication module for real-time or near-real-time analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump-off pressure data is transmitted using conventional mud-pulse telemetry, then data transmission occurs, but the transmission is non-real-time due to limited bandwidth
Solution Approach 1:
The patent extracts only the essential features of the pressure data by applying compression protocols that identify and transmit key pressure profile characteristics rather than all raw data points. This selective extraction enables real-time transmission within limited bandwidth while maintaining the reliability needed for formation damage prevention.
Solution Approach 2:
The patent changes the parameter representation of pressure data by transforming continuous pressure measurements into compressed discrete values using various compression protocols. This parameter transformation reduces data volume while preserving critical information, resolving the contradiction between real-time transmission requirements and bandwidth limitations.
2Productivity
If data compression is applied to increase transmission speed, then real-time transmission becomes possible, but data accuracy may be compromised
Solution Approach 1:
The patent implements dynamic selection of compression protocols based on the specific characteristics of the pressure data and transmission conditions. The system adapts the compression level and method to maintain accuracy thresholds while maximizing transmission speed, resolving the contradiction between productivity and measurement precision.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor transmission quality and adjust compression parameters accordingly. By continuously evaluating the balance between compression ratio and data accuracy, the feedback loop ensures that real-time transmission is achieved without compromising the precision needed for formation damage prevention.
3Productivity
If multiple compression protocols are evaluated and selected, then optimal compression is achieved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-evaluating and selecting appropriate compression protocols based on expected data characteristics and transmission requirements. This advance preparation reduces the complexity of real-time protocol selection while maintaining high compression efficiency, as the system has already determined the optimal protocol before actual data transmission begins.
Data Source
AI summary
Aspects of the disclosure can relate to a method for transmitting a pump-off pressure profile within a limited bandwidth. For example, a method may include selecting a compression protocol based upon at least one of a time length associated with the pump-off pressure data, a relative mean-squared error associated with the pump-off pressure data, or a maximum error associated with the pump-off pressure data. The method also includes compressing pump-off pressure data with the compression protocol to produce compression bits. The compression bits represent the pump-off pressure profile. The method also includes transmitting, via a communication module, the compression bits to a computing device.