Viscoelastic Surfactant Composition for Wellbore Lost Circulation Control
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Solution Overview
Problem
Conventional lost circulation pills require large amounts of materials and face difficulties in removing component materials post-treatment, making them inefficient for controlling lost circulation in wellbore servicing.
Innovation Solution
A composition comprising a cationic surfactant and anionic surfactant package (CASP) that forms a viscosified composition (CASP-VC) when contacted with an aqueous solution, which can be used to seal lost circulation zones with tunable viscoelastic properties, reducing fluid loss without the need for excessive materials or hydrotropes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lost circulation materials are used to control lost circulation, then the lost circulation zones can be sealed, but large amounts of materials are required and removal of component materials is difficult
Solution Approach 1:
The patent changes the chemical parameters by using a viscoelastic surfactant composition that forms wormlike micelles, transforming the material from conventional lost circulation materials to a surfactant-based system with tunable viscoelastic properties, achieving effective sealing with reduced material quantity
Solution Approach 2:
The invention employs a composite surfactant system comprising cationic surfactant, anionic surfactant, and nonionic surfactant in specific ratios, creating a composite material that exhibits enhanced viscoelastic behavior and sealing capability with reduced overall material requirements
2Reliability
If conventional lost circulation materials are used, then lost circulation can be controlled, but removal of component materials after treatment is difficult
Solution Approach 1:
The patent utilizes the temperature-sensitive viscoelastic properties of the surfactant composition, which maintains high viscosity at reservoir temperatures for effective sealing but can be broken down or removed more easily under different conditions, facilitating post-treatment removal
Solution Approach 2:
The surfactant-based viscoelastic composition acts as a temporary plug that fulfills its sealing function and can then be removed or degraded, replacing permanent conventional materials with a transient, removable solution
3Reliability
If large amounts of lost circulation materials are used, then lost circulation zones can be effectively sealed, but the complexity and cost of the treatment increases
Solution Approach 1:
The viscoelastic surfactant composition serves multiple functions: it seals lost circulation zones, maintains wellbore pressure, and can be tuned for different temperature conditions, replacing multiple separate treatments with a single multi-functional material
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 CASP-VC effectively seals lost circulation zones, reducing fluid loss and maintaining high viscosity even at elevated temperatures, thus addressing the inefficiencies of conventional methods while minimizing material usage and environmental impact.
Implementation Method 1
comprising a cationic surfactant and anionic surfactant, wherein the surfactant package when contacted with an aqueous solution forms a viscosified composition
Implementation Method 2
forms a viscosified composition in the presence of less than about 30 wt. % of a hydrotrope
Data Source
AI summary
A method of servicing a wellbore comprising placing downhole a composition comprising a surfactant package comprising a cationic surfactant and anionic surfactant, wherein the surfactant package when contacted with an aqueous solution forms a viscosified composition in the presence of less than about 30 wt. % of a hydrotrope.