Monovalent Divalent Cation Brine for Hydraulic Fracturing Stability
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Solution Overview
Problem
Current fracturing fluids used in hydraulic fracturing operations often fail to effectively stabilize fractures, leading to reduced permeability and clogging, and pose environmental hazards due to toxicity, while lacking the ability to function as both dispersing and aggregating fluids in varying soil conditions.
Innovation Solution
A brine solution with a mixture of monovalent and divalent cations, along with surfactants and additives, is used to create a fracturing fluid that disperses clay particles and stabilizes fractures, allowing for longer hydrocarbon flow and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dispersing fracture fluids (monovalent cation salts) are used, then clay particles are dispersed and carried out of the fracture zone, but the fracture zone becomes unstable and clogs over time
Solution Approach 1:
The patent combines monovalent cation salts (for dispersing clays) and divalent cation salts (for stabilizing the fracture zone) into a single fracture fluid composition. This merging allows the fluid to simultaneously disperse clay particles to maintain flow pathways while stabilizing the fracture zone structure, resolving the contradiction between production enhancement and long-term stability
Solution Approach 2:
The fracture fluid uses a composite salt system containing both monovalent (NaCl, KCl) and divalent (CaCl2, MgCl2) cation salts. This composite material approach enables the fluid to exhibit dual functionality: dispersing clays through monovalent cations while providing structural stabilization through divalent cations, thereby maintaining both productivity and fracture zone integrity
2Stability of the object's composition
If aggregating fracture fluids (divalent cation salts) are used, then the fracture zone is stabilized, but clay particles aggregate and clog the pay zone
Solution Approach 1:
The patent applies different cation types to different functional needs within the same fracture fluid: monovalent cations locally perform clay dispersal at the clay particle level, while divalent cations locally provide structural stabilization at the fracture zone level. This spatial and functional differentiation allows simultaneous achievement of stability and productivity without mutual interference
3Reliability
If conventional fracturing fluids are used, then fractures are created and propped open, but the fluids are toxic and create environmental hazards
Solution Approach 1:
The patent replaces complex, toxic chemical additives with simple, naturally occurring salt solutions (NaCl, KCl, CaCl2, MgCl2). These benign salts serve as effective fracture fluids without the environmental persistence and toxicity of conventional chemicals, aligning with the principle of using simple, disposable, non-harmful materials instead of complex toxic ones
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 solution effectively maintains fracture stability and hydrocarbon flow for a longer duration, while being non-toxic and minimizing hazardous waste, addressing the limitations of existing fluids by providing both dispersing and aggregating properties.
Implementation Method 1
A dispersing fracture solution in the fracture zone will disperse clays and other earthen particles and allow them to be carried by the flow-back fluids out of the hydrocarbon producing fracture zone
Implementation Method 2
an aggregating fracture solution, such as CaCl2, will aggregate and bind clays and other earthen materials. This stabilizes the fracture zone
Implementation Method 3
a fracturing fluid (or 'frac fluid') is hydraulically injected into a wellbore penetrating the subterranean formation and is forced against the formation strata by very high pressure. The formation strata or rock is forced to crack and fracture
Data Source
AI summary
A method for fracturing a subterranean formation penetrated by a well bore comprises formulating a fracturing fluid useful in hydrocarbon drilling having the properties of both a dispersing fracture solution and an aggregating fracture solution. In particular, the dispersing properties of the stabilizing fracture solution are able to act as a dispersing fracture fluid in the clay and earthen materials discharged from the pay zone in the flow-back fluids during hydraulic fracturing. At the same time, aggregating properties of the stabilizing solution stabilize the pay zone. This stabilization property allows the flow of hydrocarbon through the fractures for a significantly longer time than with prior art fluids.