Low-Density Treatment Fluid Plugging Thief Zones
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Solution Overview
Problem
Traditional treatment fluids struggle to effectively control unwanted water production from thief zones located above hydrocarbon pay zones due to density differentials, leading to incomplete water shutoff during hydrocarbon extraction.
Innovation Solution
A low-density treatment fluid comprising a base water-control system with colloidal silica and a light-weight filler material, which can penetrate deeper into thief zones and plug them, reducing water production by displacing secondary fluids and accumulating on the surface of target hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional treatment fluids are used to treat thief zones, then water production can be controlled to some extent, but the treatment fluid cannot penetrate deeply into thief zones located above pay zones due to unfavorable density differential
Solution Approach 1:
The patent changes the density parameter of the treatment fluid by incorporating light-weight filler materials (such as hollow glass microspheres, expanded perlite, or foam beads) with densities less than 2.0 g/cm³, preferably less than 1.0 g/cm³. This reduces the overall treatment fluid density to be closer to or less than the density of hydrocarbons in the pay zone, enabling deeper penetration into thief zones above the pay zone while maintaining water shutoff effectiveness.
2Length of moving object
If treatment fluid density is reduced to enable deeper penetration, then penetration depth improves, but the ability to control water production may be compromised
Solution Approach 1:
The patent creates a composite treatment fluid system combining light-weight filler materials (providing low density for deep penetration) with water-control additives such as crosslinked polymers, gel-forming agents, or precipitating agents (providing water shutoff capability). This composite formulation allows the treatment fluid to simultaneously achieve deep penetration into thief zones while maintaining effective water production control through gelation or precipitation mechanisms that are independent of fluid density.
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
The low-density treatment fluid effectively reduces water production by plugging thief zones and accumulating on the surface of hydrocarbons, enhancing hydrocarbon recovery efficiency and reducing water co-production.
Implementation Method 1
The low-density treatment fluid introduced into a target zone allows for deeper penetration (relative to conventional treatment fluid) into water production fractures and faults
Implementation Method 2
allowing the low-density treatment fluid to displace at least a portion of the secondary fluid present in the subterranean cavity; and allowing the low-density treatment fluid to at least partially plug the at least one thief zone
Data Source
AI summary
In accordance with one or more embodiments of the present disclosure, a low-density treatment fluid includes a base water-control system and at least one light-weight filler material. The base water-control system may include an inorganic material system comprising an aqueous colloidal silica and a water-soluble chemical activator for gelling the colloidal silica, or the base water-control system may include an organic material system comprising of polymeric material. The low-density treatment fluid may have a density of from 0.1 g/cm3 to 0.75 g/cm3. Also described are methods of recovering a target fluid from a subterranean cavity using such a low-density treatment fluid.