Encapsulated Demulsifier Release for Flowback Emulsion Breaking
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Solution Overview
Problem
Existing hydraulic fracturing processes face challenges in efficiently demulsifying emulsions formed in subterranean formations, leading to costly post-fracturing fluid treatment at the surface.
Innovation Solution
Incorporation of encapsulated demulsifiers in fracturing fluids, which are released at controlled times to break emulsions downhole, avoiding surface treatment costs and minimizing interference with other fluid components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If demulsifier is added to fracturing fluid, then emulsion breaking capability is improved, but interference with other fluid components occurs
Solution Approach 1:
The demulsifier is encapsulated in capsules that are injected into the subterranean formation along with the fracturing fluid. The capsules remain intact during the fracturing operation and only release the demulsifier after the fracturing is complete, as indicated by the flowback of fluid. This preliminary encapsulation allows the demulsifier to be present in the system without interfering with other fluid components during the critical fracturing phase.
Solution Approach 2:
The capsule acts as an intermediary carrier that separates the demulsifier from the rest of the fracturing fluid system during injection and fracturing. The capsule protects the demulsifier from premature interaction with other fluid components while still allowing it to reach the emulsion in the formation. The capsule shell serves as a temporary barrier that is designed to break down or release its contents only when needed.
2Reliability
If surface treatment is applied to demulsify flowback, then emulsion separation is improved, but treatment costs increase
Solution Approach 1:
The demulsifier is applied in advance during the fracturing operation itself, rather than waiting until surface treatment is needed. By injecting encapsulated demulsifier along with the fracturing fluid and having it release after fracturing, the emulsion is broken downhole before the flowback reaches the surface. This preliminary demulsification action eliminates or reduces the need for costly post-fracturing surface treatment operations.
Solution Approach 2:
The system performs its own demulsification function during the fracturing process itself, without requiring separate surface treatment operations. The encapsulated demulsifier is delivered to the formation, releases at the appropriate time, and breaks the emulsion in situ. This self-service approach to demulsification eliminates the need for external surface treatment facilities and reduces operational costs.
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
Facilitates demulsification of fracturing fluid emulsions before reaching the surface, reducing post-fracturing treatment costs and maintaining hydraulic fracturing efficiency.
Implementation Method 1
the capsule releases the demulsifier into the fracturing fluid
Implementation Method 2
breaking the emulsion with the demulsifier released by the capsules
Data Source
AI summary
A variety of methods, compositions, apparatuses, and systems are disclosed, including, in one embodiment, a technique of hydraulic fracturing involving providing a fracturing fluid having capsules containing a demulsifier through a wellbore into a subterranean formation and hydraulically fracturing the subterranean formation with the fracturing fluid, wherein the fracturing fluid forms an emulsion in the subterranean formation. The technique includes releasing the demulsifier from the capsules in the subterranean formation, breaking the emulsion in the subterranean formation with the demulsifier released by the capsules, and flowing the fracturing fluid as flowback from the subterranean formation through the wellbore to surface after and/or during the breaking of the emulsion.