Caged-Ball Frac Plug Wellbore Proppant Settlement
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Solution Overview
Problem
Conventional well completion methods face inefficiencies in hydraulic fracturing, where proppant accumulation occurs predominantly at the proximal clusters, hindering fluid flow and requiring costly well cleanouts, due to the isolation and stimulation processes used in plug & perf operations.
Innovation Solution
A method that allows partial communication between stages during stimulation, using caged-ball frac plugs and tubing-conveyed perforating guns to create perforations and control fluid flow, reducing proppant accumulation and enhancing fluid distribution across the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plug & perf operations are used to isolate and stimulate stages, then stage isolation is achieved, but proppant accumulation occurs at proximal clusters hindering fluid flow
Solution Approach 1:
The wellbore is divided into multiple stages with deployable plugs creating isolated zones. Each stage can be independently stimulated and managed, allowing proppant to be contained within specific zones rather than accumulating uniformly throughout the wellbore.
Solution Approach 2:
The system transitions from static isolation to dynamic control by using deployable plugs that can be set and released as needed. This allows fluid to communicate between stages during stimulation while maintaining isolation during production, preventing proppant accumulation issues.
2Productivity
If conventional stimulation processes are used, then proppant is placed in the formation, but proppant settlement occurs in the wellbore requiring costly cleanouts
Solution Approach 1:
The harmful effect of proppant settlement is extracted and removed from the system by using targeted stimulation techniques that deliver proppant directly to the formation through controlled fluid flow paths, preventing wellbore accumulation that would require cleanout operations.
Solution Approach 2:
Perforations are created and staged before stimulation, with plugs positioned in advance to control fluid flow paths. This preliminary preparation ensures that proppant is directed efficiently into the formation during stimulation, preventing settlement in the wellbore and eliminating the need for subsequent cleanout operations.
3Reliability
If full isolation between stages is implemented, then stage independence is achieved, but fluid flow distribution becomes uneven
Solution Approach 1:
The system uses dynamically controllable isolation through deployable plugs that can be set or released based on operational needs. During stimulation, plugs can be released to allow fluid communication between stages for uniform distribution, then set to maintain independence during production.
Solution Approach 2:
Deployable plugs act as intermediaries between stages, providing controlled communication rather than complete isolation or complete openness. These plugs can be positioned to allow fluid flow during stimulation while maintaining stage independence during production, balancing both requirements.
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 reduces proppant settlement in the wellbore, promotes uniform fluid flow, and minimizes the need for post-completion cleanouts, thereby improving the efficiency and cost-effectiveness of well completion operations.
Implementation Method 1
caged-ball frac plugs
Implementation Method 2
caged-ball frac plugs
Implementation Method 3
the shaped charges may be detonated, thereby creating perforations
Implementation Method 4
A series of shaped charges are held in a hollow steel carrier
Data Source
AI summary
A method for well completion employs a combined plugging and perforating operation for creating multiple spaced-apart clusters of perforations and optional stimulation treatments in stages. For each stage to be completed, a frac plug, carried, for example, along a wireline bottom hole assembly with perforating guns, is set in the wellbore distal (toward the toe end of the well) of the most proximal perforation cluster of the previous stage, thereby maintaining open hole conditions that provide adequate flow past the most distal perforation clusters in the current stage and minimizing proppant accumulation in the wellbore from stimulation operations. The method further allows subsequent pump down of tools and equipment even with the plug set in the wellbore.