SRV and EUR Determination via Production Data Deviation
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Solution Overview
Problem
In the oil and gas industry, determining the stimulated reservoir volume (SRV) and estimated ultimate recovery (EUR) in unconventional reservoirs with low permeability and high viscosity is challenging due to the complexity of hydraulic fracturing processes, requiring more accurate methods for hydrocarbon production optimization.
Innovation Solution
A method and system that monitor hydrocarbon fluid production at the wellhead, measure bottom hole pressure, and calculate SRV and EUR using cumulative production data, fluid densities, and porosity values, identifying a deviation point in the relationship between cumulative production and time to determine the stimulated reservoir volume and ultimate recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic fracturing is used to enhance hydrocarbon production in unconventional reservoirs, then production rate is improved, but determination of SRV and EUR becomes more complex
Solution Approach 1:
The patent transforms the complex determination of SRV and EUR into a simplified process by changing the approach from direct measurement to calculation based on production data. The method uses cumulative production data and time relationships, identifying a deviation point where the relationship changes from linear to non-linear, to derive SRV and EUR through mathematical relationships rather than complex direct measurement
Solution Approach 2:
The patent replaces complex physical measurement systems with a data processing and calculation system. Instead of using complex monitoring equipment to directly measure SRV and EUR, the method substitutes a computational approach that uses readily available production data (cumulative production and time) processed through mathematical relationships to determine these parameters
2Measurement precision
If traditional methods are used to determine SRV and EUR, then measurement precision may be maintained, but loss of time increases
Solution Approach 1:
The patent performs preliminary actions by collecting and organizing production data (cumulative production and time) before the actual determination process. The method establishes the relationship between cumulative production and time in advance, identifies the deviation point beforehand, and uses these pre-prepared elements to quickly calculate SRV and EUR, significantly reducing the time required compared to traditional measurement methods
3Ease of operation
If simplified methods are used to determine SRV and EUR, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms by using the identified deviation point in the cumulative production-time relationship to refine and validate the calculation of SRV and EUR. The method uses the change from linear to non-linear relationship as a feedback signal to determine when the stimulated reservoir volume boundaries are reached, ensuring accurate determination while maintaining operational simplicity
Solution Approach 2:
The patent applies dynamics by using the changing relationship between cumulative production and time, specifically identifying the transition point from linear to non-linear behavior. This dynamic approach allows the method to adapt to the actual reservoir response during production, maintaining precision while keeping the operation simple through automated detection of the deviation point
Data Source
AI summary
A method for determining SRV and EUR includes: monitoring an amount and a density of a hydrocarbon fluid produced from the production well; obtaining a cumulative amount of the fluid that has accumulated from a beginning of production; obtaining a relationship between the cumulative amount and a square root of the time; determining a deviation point where the relationship changes from linear to non-linear; determining a deviation amount of the fluid corresponding to the deviation point; determining a first density of the hydrocarbon fluid at the beginning of production, a second density at a pore pressure equal to a bottom hole pressure in the production well, a first porosity at the beginning of production, and a second porosity for a pore pressure equal to the bottom hole pressure; and determining SRV and the EUR based on the deviation amount, the first and second densities, and the first and second porosities.