Nested Wellbore Strings for Selective Zone Treatment
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Solution Overview
Problem
Current wellbore completion methods struggle to selectively treat and fracture multiple zones efficiently, as existing technologies lack the ability to independently control the treatment of each zone, leading to suboptimal hydrocarbon flow from low-mobility formations.
Innovation Solution
An apparatus and method involving an outer string with independently settable packers and flow ports, coupled with an inner string containing a frac port, allowing for selective treatment of zones by activating packers and supplying treatment fluids to specific zones, enabling efficient fracturing and packing of hydrocarbon-bearing zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional wellbore completion methods are used to treat multiple zones, then the wellbore can be completed for hydrocarbon production, but the ability to selectively and independently treat each zone is insufficient, leading to suboptimal hydrocarbon flow from low-mobility formations
Solution Approach 1:
The wellbore treatment system is segmented into multiple independently controllable zones, each with its own packer and flow control mechanism. This allows selective isolation and treatment of individual zones based on their specific hydrocarbon mobility characteristics, enabling optimized treatment for each zone rather than treating all zones uniformly.
Solution Approach 2:
The system incorporates dynamically controllable flow ports and packers that can be activated or deactivated based on treatment requirements. The inner string can be selectively positioned to open or close flow ports corresponding to specific zones, allowing real-time adaptation of the treatment system to match the dynamic needs of different formation zones.
2Adaptability or versatility
If an assembly with outer string and inner string is deployed to frac/pack multiple zones, then multiple zones can be treated, but the complexity of independently controlling treatment of each zone increases
Solution Approach 1:
The system employs a nested configuration where the inner string is positioned within the outer string. The inner string functions as a control mechanism that can selectively activate packers and open flow ports at specific depths along the outer string. This nested arrangement allows complex multi-zone control functionality while maintaining a relatively simple overall structure, as the inner string serves multiple control functions through its positioning and activation mechanisms.
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 solution allows for the independent treatment of multiple wellbore zones, enhancing hydrocarbon flow by enabling precise control over fracturing and packing operations, thereby improving the mobility of hydrocarbons from low-mobility formations.
Implementation Method 1
an outer string with an inner string therein is run in or deployed in the wellbore... each packer is configured to be set independently
Implementation Method 2
The inner string includes devices attached to a tubing to operate certain devices in the outer string and facilitate fracturing and/or other well treatment operations... supplying a fluid with proppant to each such zone
Implementation Method 3
fracturing and packing (also referred to as 'frac/pack'), is often utilized to create cracks in the rock in the reservoir and pack it with sand to enable the fluid from the formation (formation fluid) to flow from the reservoir into the wellbore
Data Source
AI summary
In one aspect, an apparatus for selectively treating a plurality of zones around wellbore is disclosed that in one non-limiting embodiment includes an outer string for placement in the wellbore, the outer string including a packer above a flow port corresponding to each zone, wherein each packer is configured to be set independently and the flow port is configured to supply a treatment fluid to its corresponding zone when such flow port is open, an activation device coupled to each packer, wherein each such activation device is configured to be independently activated to set its corresponding isolation packer, and an inner string for placement in the outer string, the inner string including a frac port for supplying a fluid under pressure to each flow port.