Radial Nozzle Positioning for Matrix Acidizing Jet Velocity Control
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Solution Overview
Problem
Current matrix acidizing techniques lack control over the velocity of the stimulating fluid jet at the impingement point, leading to inefficient wormhole initiation and increased fluid consumption due to uncontrollable standoff distances.
Innovation Solution
A downhole tool with moveable arms and adjustable nozzles that allow for controlled radial movement, enabling precise adjustment of the standoff between the nozzle exit and the wellbore surface, thereby maintaining optimal jet velocity for wormhole initiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coiled tubing with fixed nozzles is used to inject stimulating fluid, then the equipment complexity is reduced, but the control over jet velocity at impingement point is lost
Solution Approach 1:
The nozzle is mounted on a moveable arm that can radially translate to adjust the standoff distance dynamically. This allows the system to adapt the jet velocity at impingement point by changing the distance between nozzle exit and wellbore surface, resolving the contradiction between simple fixed equipment and controlled jet velocity.
2Device complexity
If large standoff distance is used between nozzle and wellbore surface, then the equipment design is simplified, but the jet velocity decreases dramatically
Solution Approach 1:
The moveable arm enables dynamic adjustment of standoff distance, allowing the system to optimize jet velocity by positioning the nozzle at the appropriate distance from the wellbore surface rather than using a fixed large standoff.
Solution Approach 2:
The system changes the standoff distance parameter dynamically through radial movement of the nozzle on the moveable arm, optimizing jet velocity at impingement point while maintaining equipment design feasibility.
3Productivity
If high injection flow rate is used to maintain jet velocity, then the wormhole initiation is improved, but the formation fracturing occurs
Solution Approach 1:
By dynamically adjusting the standoff distance through nozzle movement, the system can achieve optimal jet velocity at impingement point with lower injection flow rates, preventing formation fracturing while maintaining effective wormhole initiation.
Solution Approach 2:
The system changes the standoff distance parameter to optimize the balance between jet velocity and injection pressure, enabling effective wormhole initiation without exceeding formation fracture pressure limits.
4Device complexity
If fixed nozzle position is used, then the device complexity is reduced, but the wormhole placement control is poor
Solution Approach 1:
The moveable arm enables dynamic positioning of the nozzle to precise locations on the wellbore surface, allowing controlled wormhole placement at desired locations rather than relying on fixed nozzle positions.
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
Enhances the probability of wormhole placement in desired locations and reduces the amount of stimulating fluid required, minimizing induction time and overall operation costs.
Implementation Method 1
formation rock (often carbonates) at or near the treatment site or zone can react to the stimulating fluid and undergo dissolution reactions that produce highly permeable channels or 'wormholes'
Data Source
AI summary
The present disclosure relates to downhole tools and related methods that provide for controlled radial movement of one or more nozzles to provide an adjustable and variable standoff between the exit of the nozzle(s) and the wellbore surface in the treatment zone of a wellbore during matrix acidizing.