Dew Point Pressure Prediction Using Derivative Analysis

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Solution Overview

Problem

Current methods for determining dew point pressure in subterranean hydrocarbon reservoirs are inefficient and lack real-time capabilities, affecting wellsite operation decisions such as maintaining optimal production pressures and preventing condensate banking.

Innovation Solution

A processing system with a processor and memory, utilizing computer program code to analyze fluid pressure data by detecting inflection, downward curve, and characteristic change pressures through derivative analysis and energy ratio functions, estimating dew point pressure based on these pressures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional methods are used to determine dew point pressure, then the measurement can be performed, but the process is inefficient and lacks real-time capability

Engineering Contradiction:

Improvereal-time capabilityVSAvoidtime for determination

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing derivative analysis and energy ratio calculations on fluid pressure data in advance, enabling real-time prediction of dew point pressure without requiring time-consuming traditional measurement methods during wellsite operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces traditional mechanical/physical measurement methods with computational methods, using processors to analyze pressure data through derivatives and energy ratio functions, thereby achieving real-time dew point pressure determination

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If traditional dew point pressure determination methods are used, then the basic measurement can be obtained, but accurate pressure management for preventing condensate banking cannot be achieved

Engineering Contradiction:

Improveaccuracy of pressure managementVSAvoidability to prevent condensate banking

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements feedback by continuously monitoring fluid pressure and using the calculated dew point pressure predictions to guide wellsite operations, allowing real-time adjustment to prevent condensate banking and maintain optimal production pressures

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the approach from direct measurement to parameter-based prediction, using derivative analysis and energy ratio functions to calculate dew point pressure from pressure data, thereby improving both measurement precision and operational reliability

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11193373B2Prediction of saturation pressure of fluid

Publication Date: 2021.12.07 SCHLUMBERGER TECH CORP

AI summary

Apparatus and methods for obtaining a data response of a fluid as a function of pressure of the fluid, and estimating a dew point pressure of the fluid by detecting an inflection pressure, a downward curve pressure, a characteristic change pressure, and an intersection pressure of the function representative of the data response. The estimated dew point pressure of the fluid based on at least one of the inflection pressure, the downward curve pressure, the characteristic change pressure, and the intersection pressure.