Clay-Free Oil-in-Water Drilling Fluid Additive for High Temperature and Density
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Solution Overview
Problem
Current clay-free oil-in-water drilling fluids face challenges with poor temperature resistance and low density, making them unsuitable for high-pressure deep wells.
Innovation Solution
A drilling fluid additive composition comprising an emulsifier and a dimer acid-organic amine copolymer rheological modifier, which enhances the drilling fluid's temperature resistance and density without the need for a clay phase, achieving a temperature resistance of 240°C and a density of 2.6 g/cm3 or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the density of oil-based drilling fluid is increased to meet high pressure formation requirements, then the drilling fluid can withstand higher formation pressures, but the rheological behavior deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific emulsifiers (Formula 1) and rheological modifiers (dimer acid-organic amine copolymer) to achieve super high density (≥2.6 g/cm³) while maintaining acceptable rheological properties through molecular-level interactions rather than simple density addition
Solution Approach 2:
The patent creates a composite oil-in-water emulsion system combining oil phase, water phase with dissolved organic salts, emulsifiers, and rheological modifiers to achieve a composite material with both high density and improved rheological behavior that cannot be obtained by single-phase systems
2Temperature
If the bottom well temperature increases with well depth, then deeper wells can be drilled, but the temperature resistance of drilling fluid becomes insufficient
Solution Approach 1:
The patent changes the thermal stability parameters by selecting emulsifiers and rheological modifiers with high thermal stability, achieving temperature resistance of 240°C or higher through chemical composition optimization rather than physical barriers
Solution Approach 2:
The patent replaces traditional clay phases that degrade at high temperatures with synthetic organic-based emulsifiers and rheological modifiers that maintain stability at 240°C, using chemically stable compounds instead of thermally labile natural materials
3Stability of the object's composition
If clay phase is used to improve suspension property of oil-based drilling fluid, then suspension capability is enhanced, but temperature resistance deteriorates and reservoir damage increases
Solution Approach 1:
The patent extracts and removes the clay phase component from the drilling fluid system, eliminating the source of temperature degradation and reservoir damage while maintaining suspension properties through alternative chemical mechanisms using emulsifiers and rheological modifiers
Solution Approach 2:
The patent creates a clay-free system that copies the suspension function of clay phases through emulsifiers (Formula 1) and rheological modifiers (dimer acid-organic amine copolymer) that provide similar colloidal stabilization and particle suspension capabilities without the thermal and environmental drawbacks
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 additive composition significantly improves the drilling fluid's high temperature resistance and density, making it suitable for high-pressure deep well operations while minimizing reservoir damage.
Implementation Method 1
super high temperature super high density clay-free oil-in-water drilling fluid
Implementation Method 2
the rheological modifier is dimer acid-organic amine copolymer comprising structural units from dimer acid, structural units from alkylamine and structural units from arylamine
Data Source
AI summary
The present invention relates to the field of petrochemical drilling and discloses a drilling fluid additive composition. The composition contains an emulsifier and a rheological modifier. The emulsifier is one or more of the compounds represented by Formula (1); the rheological modifier is dimer acid-organic amine copolymer, comprising structural units from the dimer acid, structural units from the alkylamine and structural units from the arylamine. The present invention further provides a drilling fluid containing the foregoing composition. When a clay-free oil-in-water drilling fluid contains the drilling fluid additive composition of the present invention containing the emulsifier and rheological modifier, it may have high temperature resistance and high density;