Synthetic Clay for Blocking Fluid Communication Between Wells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods to prevent fluid communication between wells, such as polymer solutions, are not thermally stable and require frequent reapplication, leading to increased operational costs and reduced well production due to degradation at high temperatures and temporary effectiveness.
Innovation Solution
The use of synthetic clay, specifically thermally stable synthetic hectorite and smectite clays, which swell and increase viscosity when exposed to aqueous fluids, effectively blocking flow paths between wells and maintaining stability at high temperatures, thereby reducing fluid communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer solutions are used to block flow paths between wells, then fluid communication is reduced temporarily, but the polymers degrade at high temperatures and require frequent reapplication
Solution Approach 1:
The patent changes the chemical composition parameter from organic polymers to inorganic clay particles (such as bentonite or attapulgite), which fundamentally alters the thermal stability characteristics. This parameter change enables the material to maintain its flow-blocking properties at high temperatures where polymers would degrade, thereby extending the duration of action and improving reliability.
Solution Approach 2:
The patent employs clay particles that can be easily injected and distributed through the fracture network. While individual clay particles are simple and inexpensive, their collective action provides long-lasting flow blocking without degradation, eliminating the need for frequent reapplication required by polymer solutions.
2Productivity
If polymer solutions are used to prevent fluid communication, then well production is protected short-term, but operational costs increase due to frequent reapplication
Solution Approach 1:
The patent uses clay particles in concentrations that may exceed what is strictly necessary for initial flow blocking, ensuring that sufficient material remains in the fracture network to maintain blocking over extended periods. This excessive initial placement compensates for any gradual migration or settling, providing long-term protection without requiring reapplication.
Solution Approach 2:
The clay particles provide continuous flow blocking action over extended periods, maintaining well production protection without interruption. Unlike polymers that require periodic reapplication, the clay-based system maintains its effectiveness continuously, eliminating operational downtime for maintenance.
3Quantity of substance
If polymer solutions are injected into flow paths, then fluid communication is blocked, but the polymers hydrolyze and lose viscosity over time
Solution Approach 1:
The patent replaces the chemical mechanism of polymer cross-linking and viscosity maintenance with a mechanical/physical mechanism using clay particle suspension and settling. The clay particles maintain their structural integrity through physical rather than chemical means, resisting hydrolysis and maintaining suspension stability without relying on chemical bonds that can break down.
Solution Approach 2:
The patent uses composite clay formulations that may include multiple clay types or clay combined with minimal stabilizing agents to enhance suspension stability. This composite approach ensures that the blocking agent maintains its physical and chemical properties over time, resisting hydrolysis and maintaining effective concentration in the fracture network.
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 synthetic clay solution provides long-term, thermally stable blocking of fluid communication between wells, reducing the need for frequent reapplication and maintaining well production by preventing the influx of stimulation treatment fluids into producing wells, even at temperatures above 200°F.
Implementation Method 1
synthetic clay, specifically thermally stable synthetic hectorite and smectite clays, which swell and increase viscosity when exposed to aqueous fluids
Implementation Method 2
maintaining stability at high temperatures, thereby reducing fluid communication... even at temperatures above 200°F
Data Source
AI summary
Methods and systems for reducing fluid communication between wells. Providing a first treatment fluid comprising synthetic clay and an aqueous carrier fluid; pumping the first treatment fluid into a first fracture network in fluid communication with a first well; placing the synthetic clay in the first fracture network; pumping a second treatment fluid into the first fracture network after placing the synthetic clay in the first fracture network; wherein the second treatment fluid is not produced in a second well in fluid communication with a second fracture network, and wherein the second fracture network is in fluid communication with the first fracture network.