Matrix Acidizing Plan Optimized for Bottom Hole Temperature Effects
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Solution Overview
Problem
Current matrix acidizing techniques face limitations in determining optimal injection flow rates due to pressure constraints, which can lead to inefficient wormhole formation and fluid distribution in wellbore acidizing processes, as existing methods do not adequately account for the fracture pressure gradient influenced by bottom hole temperature.
Innovation Solution
A method involving a step up rate test with multiple cycles at varying temperatures to determine the fracture pressure relationship with bottom hole temperature, integrated into a fluid placement simulator to create a design matrix acidizing plan that accounts for temperature effects, ensuring treatment pressures remain below fracture pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If injection flow rate is increased to improve fluid coverage and wormhole production, then treatment efficiency is improved, but treatment pressure may exceed fracture pressure causing unfavorable fluid distribution
Solution Approach 1:
The patent applies parameter changes by incorporating bottom hole temperature into the fracture pressure calculation. The system adjusts the fracture pressure threshold dynamically based on temperature conditions, allowing optimization of injection flow rates that account for thermal effects on formation mechanics. This enables higher injection rates to be used safely when temperature conditions permit, while preventing fractures when thermal stresses reduce fracture pressure tolerance.
2Device complexity
If traditional pressure-only methods are used to determine injection rate limits, then treatment planning is simple, but temperature-induced variations in fracture pressure are not accounted for leading to suboptimal treatment
Solution Approach 1:
The system enhances measurement precision by adding temperature as a critical parameter to the fracture pressure determination process. The patent implements a multi-parameter model that combines pressure and temperature data to calculate fracture pressure thresholds, significantly improving accuracy over traditional pressure-only methods. This refined approach enables more precise injection rate optimization while maintaining manageable treatment planning through integrated software tools.
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 results in a more accurate and efficient matrix acidizing treatment plan, preventing formation fracture and optimizing fluid placement by accounting for thermal stresses and temperature-induced changes in fracture pressure, thereby enhancing wormhole production and fluid coverage.
Implementation Method 1
Wormholes may be formed when the matrix of the porous and permeable rock is dissolved by corrosive fluids, such as hydrochloric acid
Implementation Method 2
accounting for thermal stresses and temperature-induced changes in fracture pressure
Data Source
AI summary
A method for optimized matrix acidizing, including a method for determining fracture pressure of a formation as a function of bottom hole temperature. First and second cycles of a step up rate test may be performed on the formation to be acidized at first and second test temperatures, respectively. From the first and second cycles, a mathematical relationship for fracture pressure of the formation as a function of bottom hole temperature may be formulated and integrated into a fluid placement simulator. A design matrix acidizing treatment plan accounting for an effect of bottom hole temperature on fracture gradient may simulated, and matrix acidizing treatment thereafter performed according to the design plan, thereby resulting in more accurate matrix acidizing treatment and minimization of inefficient fluid placement by adherence to actual formation fracture pressure limits.