Quebracho-Amine Fluid Loss Additive for Oil-Based Muds
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Solution Overview
Problem
Current oil-based drilling fluids face challenges in maintaining optimal rheological properties to prevent fluid loss and pipe sticking, especially in high-deviation wells, and require additives that are compatible with the solvent system while being environmentally friendly.
Innovation Solution
A composition resulting from a condensation reaction of quebracho with organophilic reactive amines is used in an invert emulsion drilling fluid to enhance fluid loss control and rheological properties, forming a quebracho-amine reaction product that is incorporated into the drilling fluid to improve lubricity and prevent pipe sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional oil-based drilling fluids are used, then lubrication and hole stability are improved, but fluid loss control and rheological property maintenance deteriorate
Solution Approach 1:
The patent uses a composite fluid loss additive comprising a condensation reaction product of quebracho with organophilic reactive amines. This composite material provides both fluid loss control and rheological property maintenance while being compatible with oil-based drilling fluids, resolving the contradiction between lubrication quality and fluid loss control.
Solution Approach 2:
The patent modifies the chemical structure of quebracho through condensation reaction with organophilic reactive amines to create a compound with improved rheological properties. This parameter change enables the additive to maintain optimal viscosity under varying shear conditions while controlling fluid loss, thus resolving the contradiction.
2Stability of the object's composition
If drilling fluids are designed to maintain high viscosity under low shear conditions, then cuttings suspension is improved, but fluid loss increases
Solution Approach 1:
The patent employs a thixotropic fluid loss additive that dynamically adjusts its viscosity based on shear conditions. The additive maintains high viscosity under low shear conditions to suspend cuttings effectively, while reducing viscosity under high shear conditions to minimize fluid loss, thus resolving the contradiction between cuttings suspension and fluid loss control.
Solution Approach 2:
The condensation reaction product of quebracho with organophilic reactive amines exhibits temperature-dependent and shear-rate-dependent rheological properties. This parameter change allows the additive to adapt its viscosity to different operational conditions, simultaneously achieving cuttings suspension and fluid loss control.
3Loss of substance
If water-based muds are used, then fluid loss control is improved, but lubrication and pipe sticking prevention deteriorate
Solution Approach 1:
The patent introduces an intermediary substance - the condensation reaction product of quebracho with organophilic reactive amines - that acts as a bridge between water-based fluid loss control mechanisms and oil-based lubrication properties. This intermediary additive can be used in oil-based muds to provide fluid loss control while maintaining lubrication quality, thus resolving the contradiction.
4Ease of operation
If drilling fluids are used in high-deviation wells, then pipe sticking prevention is improved, but rheological property maintenance deteriorates
Solution Approach 1:
The patent uses a composite additive system comprising the condensation reaction product of quebracho with organophilic reactive amines, combined with other drilling fluid components. This composite approach provides enhanced lubrication to prevent pipe sticking in high-deviation wells while maintaining stable rheological properties through the thixotropic characteristics of the additive.
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 quebracho-amine reaction product enhances the drilling fluid's ability to maintain low viscosity under high shear and high viscosity under low shear conditions, reducing fluid loss and pipe sticking, while being environmentally compatible and effective at high temperatures.
Implementation Method 1
Drilling fluids are generally characterized as thixotropic fluid systems. That is, they exhibit low viscosity when sheared, such as when in circulation (as occurs during pumping or contact with the moving drilling bit).
Implementation Method 2
when the shearing action is halted, the fluid should be capable of suspending the solids it contains to prevent gravity separation
Implementation Method 3
A composition resulting from a condensation reaction of quebracho with organophilic reactive amines is used in an invert emulsion drilling fluid
Data Source
AI summary
A composition that includes a product resulting from a condensation reaction of quebracho with at least one organophilic species that includes a reactive amine is disclosed.