Targeted Well Stimulation Using Diagnostic Logs
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Solution Overview
Problem
In the oil and gas industry, there is a challenge in effectively stimulating hydrocarbon production in tight reservoirs, as existing methods often fail to accurately identify and target active natural fractures, leading to inefficient well completions and reduced productivity.
Innovation Solution
The proposed solution involves performing a dynamic well test and generating diagnostic well logs, such as spectral noise logs and high precision temperature logs, to identify optimal stimulation zones. Targeted stimulation techniques, including hydraulic fracturing or hydrajet-assisted hydraulic fracturing, are then applied to these identified zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional petrophysical logs are used to identify fractures, then the logging process is simple, but the fractures cannot be accurately identified leading to poor productivity
Solution Approach 1:
The patent introduces diagnostic logs (spectral noise logs and high precision temperature logs) as intermediary tools between conventional logging and fracture identification. These diagnostic logs serve as mediators that detect fluid movement and temperature changes caused by active fractures, enabling accurate fracture identification without requiring complex imaging equipment.
Solution Approach 2:
The patent replaces mechanical/conventional logging methods with physics-based detection methods. Instead of relying on conventional petrophysical measurements, the system uses spectral noise analysis to detect fluid flow-induced vibrations and high precision temperature logging to detect thermal signatures of active fractures, substituting mechanical measurement with physical phenomenon-based detection.
2Productivity
If targeted stimulation is performed based on accurate fracture identification, then productivity is improved, but the stimulation process becomes more complex
Solution Approach 1:
The patent performs preliminary identification of active fractures using diagnostic logs before executing the stimulation treatment. By identifying target zones in advance through spectral noise and temperature logging during dynamic well tests, the system prepares a precise treatment plan that guides subsequent hydraulic fracturing operations, ensuring stimulation is applied only to productive zones.
Solution Approach 2:
The patent applies stimulation treatments with locally optimized parameters based on the specific characteristics of each identified fracture zone. Rather than uniform treatment across the entire wellbore, the system adjusts stimulation parameters (such as injection rate, pressure, and proppant type) to match the specific productivity potential and geological characteristics of each fracture interval.
3Loss of energy
If hydraulic fracturing is performed without accurate fracture identification, then the stimulation process is straightforward, but breakdown pressures are wasted and proppant screen-out situations occur
Solution Approach 1:
The patent implements a feedback mechanism where diagnostic logs continuously monitor fluid movement and temperature during dynamic well tests and stimulation operations. The spectral noise and temperature data provide real-time feedback on fracture activity and fluid flow patterns, allowing operators to adjust stimulation parameters dynamically to optimize breakdown pressure efficiency and prevent proppant screen-out conditions.
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 allows for the identification and stimulation of potentially contributing fractures, reducing wasted perforations and breakdown pressures, minimizing proppant screen-out situations, and enhancing hydrocarbon production by ensuring that fractures are effectively connected to the production tubing.
Implementation Method 1
spectral noise logs
Implementation Method 2
high precision temperature logs
Implementation Method 3
hydraulic fracturing
Data Source
AI summary
Systems and methods for performing targeted stimulation of a well drilled in a subsurface formation include performing a dynamic well test in the well; logging the well to generate one or more diagnostic well logs prior to stimulating the subsurface formation; identifying one or more zones in the well for targeted stimulation based on the injection test and the one or more diagnostic well logs; and performing the targeted stimulation at the identified one or more zones.