Using colloidal silica as a zonal isolation material and fast path blocker in geological formations
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Solution Overview
Problem
Current methods for blocking fast flow paths in geological formations are ineffective at high temperatures and short-lived, limiting their use in deep wells and steam-flood operations, and fail to address issues of channeling and fluid loss in oil and geothermal systems.
Innovation Solution
A system using colloidal silica solutions that transform from a nonviscous phase to a solid gel phase within geological formations, blocking fast flow paths and altering permeability, with parameters like silica concentration, colloid size, and pH adjusted to achieve desired gelation times and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gel-based fluid diversion techniques are used, then channeling in high permeability zones can be blocked, but the treatment is ineffective at temperatures above 100°C and has limited duration (less than 12 hours)
Solution Approach 1:
The patent changes the chemical composition parameters of the treatment fluid by using colloidal silica instead of conventional gel polymers. This parameter change enables the treatment to remain stable and effective at high temperatures (above 100°C) where conventional gels would degrade or lose their blocking capability.
Solution Approach 2:
The patent employs a treatment approach where the colloidal silica treatment fluid is designed to be stable for extended periods at high temperatures, replacing the short-lived conventional gels. The treatment can remain effective for months or years in high-temperature reservoirs, eliminating the need for repeated treatments.
2Reliability
If conventional gel treatments are used, then fast flow paths can be blocked, but the treatment composition gels too quickly and can be pumped only a short distance from the wellbore
Solution Approach 1:
The patent creates a dynamic system where the colloidal silica treatment fluid maintains its fluid state during injection (allowing long-distance pumping) and then transforms into a gel state after deposition in the target zone. This dynamic state change enables both long pumpability and effective blocking.
Solution Approach 2:
The patent applies preliminary action by injecting the treatment fluid in a pumpable state to distant locations, allowing it to reach the target fast flow paths before transforming. The gelation occurs after the fluid has been pumped to the desired location, ensuring adequate pumpability distance.
3Ease of operation
If colloidal silica is used to block fast flow paths, then gelation time can be extended and pumpability improved, but the treatment must be precisely positioned in the target zone
Solution Approach 1:
The patent employs feedback mechanisms by monitoring reservoir conditions (temperature, pressure, flow rate) during injection and adjusting the treatment parameters accordingly. This feedback control ensures the colloidal silica gels at the precise location of fast flow paths rather than prematurely in the wellbore or equipment.
Solution Approach 2:
The patent applies local quality by creating conditions that trigger gelation specifically in the target zone (fast flow paths) rather than uniformly throughout the system. The treatment fluid maintains its fluid properties in the wellbore and equipment, then transforms to gel only when it reaches the high-temperature, high-flow reservoir zones where blocking is needed.
4Loss of substance
If conventional cements and polymers are used to block fast paths, then fluid loss can be prevented, but the materials are ineffective at high temperatures and have short duration
Solution Approach 1:
The patent replaces short-lived conventional cements and polymers with colloidal silica that provides long-term blocking. The silica-based treatment remains stable and effective for extended periods (months to years) at high temperatures, preventing fluid loss continuously rather than requiring repeated short-duration treatments.
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
Effectively blocks fast flow paths, enhancing energy production in geothermal systems, improving oil and gas recovery, and preventing fluid loss and leakage, while being stable over extended periods and suitable for high-temperature applications.
Implementation Method 1
preparing a solution of colloidal silica having a nonviscous phase and a solid gel phase. The solution of colloidal silica is injected into the geological formations while the solution of colloidal silica is in the nonviscous phase. The solution of colloidal silica is directed into the fast flow paths and transforms into the solid gel phase in the fast flow paths thereby blocking flow of fluid in the fast paths.
Data Source
AI summary
A system for blocking fast flow paths in geological formations includes preparing a solution of colloidal silica having a nonviscous phase and a solid gel phase. The solution of colloidal silica is injected into the geological formations while the solution of colloidal silica is in the nonviscous phase. The solution of colloidal silica is directed into the fast flow paths and reaches the solid gel phase in the fast flow paths thereby blocking flow of fluid in the fast paths.