Encapsulated Crosslinker Gelation for Far-Field Fracture Control
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Solution Overview
Problem
Existing fracturing operations in subterranean formations struggle with controlling fracture formation and propagation, particularly in unconventional formations, leading to inefficient hydrocarbon recovery due to uncontrolled fracture geometry and potential formation damage.
Innovation Solution
An aqueous composition comprising a gelling agent and an encapsulated crosslinker is used, where crosslinking occurs upon release from the encapsulant, allowing for controlled fracture geometry management by delaying viscosity increase until the desired location within the fracture, thereby enhancing fracture control and reducing formation damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fracturing fluid is injected at high pressure and flow rate to create fractures, then fracture formation and hydrocarbon production are stimulated, but fracture geometry becomes uncontrolled and formation damage occurs
Solution Approach 1:
The crosslinker is pre-encapsulated within the fracturing fluid composition before injection. This preliminary encapsulation allows the crosslinking agent to be transported to the fracture location without premature reaction, enabling controlled fracture geometry while maintaining the ability to create effective propped fractures for hydrocarbon production
Solution Approach 2:
The viscosity of the fracturing fluid is dynamically changed through controlled crosslinking. By using an encapsulated crosslinker that activates at the fracture location, the fluid transitions from a low-viscosity injectable state to a high-viscosity gel state at the target zone, enabling both easy injection and effective fracture control without premature gelation
2Manufacturing precision
If crosslinking occurs immediately upon injection, then fracture control is achieved, but friction losses increase and formation damage occurs
Solution Approach 1:
The crosslinking action is preliminarily delayed by encapsulation during the injection phase. This allows the fracturing fluid to be pumped into the wellbore and formation without premature crosslinking, minimizing friction losses. The crosslinking is then triggered at the fracture location where fracture control is needed
Solution Approach 2:
The encapsulant acts as an intermediary between the crosslinker and the gelling agent. This intermediary protects the crosslinker from premature reaction during injection and transport, then allows controlled interaction at the fracture location, thereby reducing friction losses while maintaining fracture control capability
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 method achieves controlled fracture geometry and improved hydrocarbon recovery by minimizing friction losses and formation damage, optimizing fracture propagation, and increasing the efficiency of hydrocarbon extraction from unconventional formations.
Implementation Method 1
crosslinking of the gelling agent within the aqueous composition occurs upon release of the crosslinker from the encapsulant
Data Source
AI summary
Described herein are aqueous compositions including a gelling agent and a crosslinker.