Rheology Modifiers for Oil-Based Mud Temperature Stability
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Solution Overview
Problem
Drilling fluids used in challenging geographic areas, such as marine environments, face difficulties in maintaining desirable rheological characteristics over a range of temperatures, leading to instability in wellbore servicing operations.
Innovation Solution
A non-aqueous wellbore servicing fluid comprising a rheology modifier, which is a reaction product of a polysulfide, a dimer acid, and a polyfunctional amine, is introduced to maintain stable rheological characteristics over varying temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional drilling fluids are used in challenging geographic areas, then drilling operations can be conducted, but the rheological characteristics become unstable over a range of temperatures
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the drilling fluid through the use of specific rheology modifiers (polysulfide-dimer acid-polyfunctional amine reaction products) that change the fluid's rheological properties to remain stable across varying temperatures. This involves altering the molecular structure and interaction characteristics of the fluid to maintain consistent performance from 35°F to 400°F.
Solution Approach 2:
The patent employs composite materials by combining multiple functional components in the drilling fluid system, including the base fluid, rheology modifiers (polysulfide-dimer acid-polyfunctional amine reaction products), and other additives. This composite approach creates a synergistic system where each component contributes specific properties that collectively maintain rheological stability across temperature ranges.
2Temperature
If drilling fluids are exposed to extreme temperatures, then deeper wellbores can be serviced, but desirable rheological characteristics are lost
Solution Approach 1:
The patent uses parameter changes by selecting and optimizing the chemical composition of rheology modifiers that specifically respond to temperature variations. The polysulfide-dimer acid-polyfunctional amine reaction products are designed to maintain their rheological modifying capabilities across extreme temperature ranges, allowing the fluid to preserve desirable characteristics even at 400°F.
Solution Approach 2:
The patent applies this principle through the use of specialized rheology modifiers that can be easily added to the drilling fluid system. These modifiers are designed to be effective throughout the drilling operation and can be replenished or adjusted as needed, providing a cost-effective solution for maintaining performance in extreme temperature conditions.
3Adaptability or versatility
If the drilling fluid must maintain stable rheology across a broad temperature range, then it can be used in diverse environmental conditions, but the formulation becomes more complex
Solution Approach 1:
The patent applies universality by designing rheology modifiers that perform multiple functions simultaneously: they modify rheology, provide temperature stability, and maintain performance across diverse environmental conditions. The polysulfide-dimer acid-polyfunctional amine reaction products serve as multi-functional additives that simplify the overall formulation by consolidating multiple required properties into a single component system.
Solution Approach 2:
The patent uses parameter changes to optimize the concentration and composition of rheology modifiers to achieve the desired balance between versatility and formulation simplicity. By carefully controlling the reaction parameters and final composition, the patent creates a formulation that is both adaptable to various environments and relatively simple to prepare and maintain.
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 fluid maintains relatively stable yield point and gel strength across a broad temperature range, enhancing suspension ability and corrosion inhibition, thus improving the performance of drilling fluids in extreme conditions.
Implementation Method 1
a rheology modifier which is a reaction product of a polysulfide, a dimer acid and a polyfunctional amine
Implementation Method 2
the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine
Data Source
AI summary
A non-aqueous wellbore servicing fluid comprising a rheology modifier wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine. A method of conducting an oilfield operation comprising placing an oil-based mud comprising a rheology modifier into a wellbore wherein the rheology modifier comprises a reaction product of a polysulfide, a dimer acid and a polyfunctional amine.