Competitive Metal Binders Prevent Polymer Crosslinking
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Solution Overview
Problem
Polymeric friction reducers used in wellbore operations are susceptible to binding with metals, leading to polymer-metal complex formation, which increases fluid viscosity and impairs hydrocarbon production, especially in metal-rich formations.
Innovation Solution
Incorporating competitive metal binders like polyamino polyether methylene phosphonic acid (PAPEMPA) or hydroxyethylamino-di(methylene phosphonic acid) (HEMPA) into the treatment fluids to preferentially bind with metal ions, preventing the formation of polymer-metal complexes and maintaining fluid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymeric friction reducers are used to reduce turbulence and improve proppant transport, then fluid flow efficiency is improved, but polymer-metal complexes form leading to increased viscosity and flocculation
Solution Approach 1:
A competitive metal binder is introduced as an intermediary substance that preferentially binds to metal ions in the formation. This mediator prevents direct interaction between metal ions and friction reducer polymers, thereby preventing polymer-metal complex formation while allowing the polymer to maintain its flow efficiency benefits
Solution Approach 2:
The competitive metal binder is added to the treatment fluid in advance before the polymer encounters metal ions in the formation. This preliminary binding action occurs upstream, preventing the harmful polymer-metal interaction from occurring in the first place
2Productivity
If pumping rates are increased to achieve proppant transport in low viscosity fluids, then proppant transport is improved, but energy loss due to friction increases
Solution Approach 1:
The invention changes the chemical composition parameter of the fracturing fluid by adding competitive metal binders. This compositional change allows the fluid to maintain low viscosity and laminar flow characteristics while preventing the formation of high-viscosity polymer-metal complexes that would increase frictional energy losses
3Power
If friction reducer polymers are used to change turbulent flow to laminar flow, then horsepower requirement is reduced, but polymer crosslinking and flocculation occur
Solution Approach 1:
The competitive metal binder serves as a protective intermediary that sequesters metal ions, preventing them from acting as crosslinking agents for the polymer chains. This maintains polymer reliability and prevents unwanted crosslinking and flocculation
Solution Approach 2:
The competitive metal binder performs a preliminary anti-action by binding to metal ions before they can catalyze polymer crosslinking. This preemptive binding prevents the harmful chemical reactions that would compromise polymer stability
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 use of competitive metal binders effectively prevents polymer-metal complex formation, maintaining fluid viscosity and enhancing hydrocarbon production by ensuring that polymers do not crosslink or flocculate, even in the presence of metal ions, thus improving the efficiency of wellbore operations.
Implementation Method 1
Incorporating competitive metal binders like polyamino polyether methylene phosphonic acid (PAPEMPA) or hydroxyethylamino-di(methylene phosphonic acid) (HEMPA) into the treatment fluids to preferentially bind with metal ions
Implementation Method 2
A friction reducer may be used to reduce the horsepower requirement during the fracturing treatment by changing the turbulent flow to a laminar flow in the tubulars
Data Source
AI summary
Treatment fluids and associated methods for treating a subterranean formation. An example method includes introducing a treatment fluid into a wellbore penetrating the subterranean formation. The treatment fluid includes a competitive metal binder selected from the group consisting of polyamino polyether methylene phosphonic acid, hydoxyethylamino-di(methylene phosphonic acid), and a combination thereof; a polymer capable of forming a polymer-metal complex; and an aqueous fluid. The method further includes contacting a metal ion with the treatment fluid after introduction of the treatment fluid into the wellbore and binding the metal ion with the competitive metal binder.