Delayed Breaker Composition for Downhole Fluids
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Solution Overview
Problem
Current wellbore stimulation and production processes face challenges in controlling the viscosity of gelling agents used in subterranean fluids, as existing breakers often fail to provide delayed or controlled breakdown of gelling agents, which can impede production and require external sources for activation.
Innovation Solution
A composition incorporating saccharide gelling agents with an internal oxidative breaker, sequestered by a hydrocarbon miscible inert agent, which is activated upon contact with a hydrocarbon or at elevated temperatures, allowing for controlled and delayed breakdown of the gelling agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If breakers are provided as internal breakers in the treatment fluid, then the breaking function is integrated into the fluid system, but the timing and control of breaker activation is insufficient without external activators
Solution Approach 1:
The treatment fluid system performs breaker activation autonomously through self-heating during downhole circulation. The viscous gelled fluid generates heat through friction and environmental temperature as it circulates through the wellbore, which automatically triggers breaker activation when the temperature threshold is reached, eliminating the need for separate external activator systems
Solution Approach 2:
The breaker activation is controlled by temperature parameter changes. The breakable gelling agent is designed to break at a specific temperature threshold that is naturally reached during downhole circulation. By controlling the thermal history and circulation conditions, the timing of breaker activation is precisely controlled without requiring external chemical activators
2Strength
If gelling agents are used to increase viscosity for suspending components, then the desired viscosity is achieved, but the viscosity cannot be reduced in a controlled manner without external breaker sources
Solution Approach 1:
The fluid viscosity dynamically changes from high to low based on temperature conditions. During injection and initial circulation, the gelling agent maintains high viscosity for effective component suspension. As the fluid circulates downhole and temperature increases, the gelling agent automatically breaks down, reducing viscosity to improve circulation efficiency and enable production
Solution Approach 2:
The viscosity of the treatment fluid follows a periodic pattern: initially high viscosity during injection for suspension, then transitions to low viscosity during production phase. This periodic viscosity change is driven by the thermal history of the fluid, allowing the same fluid to perform multiple functions at different stages of the well operation
3Ease of manufacture
If external breakers are used to reduce viscosity, then the gelling agent can be broken down, but external sources are required which complicates the system
Solution Approach 1:
The breaker functionality is merged with the gelled treatment fluid itself by incorporating a breakable gelling agent that responds to temperature. The gelling agent serves dual purposes: providing viscosity when needed and breaking down when temperature increases, combining the functions of both gelling and breaking into a single integrated system component
Solution Approach 2:
The need for external breaker chemicals and activators is extracted from the system. Instead of adding separate breaker components from external sources, the breakdown capability is inherent in the gelled fluid through the use of temperature-sensitive gelling agents that automatically break under downhole thermal conditions
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
Enables controlled and delayed breakdown of gelling agents, enhancing the efficiency of wellbore operations by reducing viscosity at the right time, thereby improving fluid circulation and production without the need for external breaker sources.
Implementation Method 1
an internal breaker which is an oxidative breaker
Implementation Method 2
a sequestering agent that is inert to oxidation by the breaker and which is miscible with hydrocarbons
Implementation Method 3
activated upon contact with a hydrocarbon or at elevated temperatures
Data Source
AI summary
A downhole fluid composition having a saccharide gelling agent, an oxidative breaker, and a sequestering agent. The sequestering agent is hydrocarbon miscible and inert to oxidation by the oxidative breaker. The sequestering agent sequesters the oxidative breaker or an activator for the oxidative breaker, whereby oxidation of the gelling agent is inhibited. The downhole fluid may also include a proppant. Upon contacting hydrocarbons downhole or reaching a predetermined temperature, the sequestering agent releases the oxidative breaker or activator thereby oxidizing the saccharide gelling agent.