Solid-Free Invert Emulsion Drilling Fluid for Lower Downhole Erosion
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Solution Overview
Problem
Conventional invert emulsion drilling fluids containing solids such as clays increase downhole pressure, leading to mechanical washout and erosion of oilfield tubulars and pumping equipment.
Innovation Solution
Invert emulsion drilling fluids composed of an aqueous phase, oil phase, and emulsifier composition using amidoamine, organic acids, and alcohol alkoxylates, without solid or insoluble additives like clays, to maintain stability and rheology for effective wellbore cleaning and suspension of weighting agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If solids such as clays are added to invert emulsion drilling fluids to impart rheological properties and increase density, then the drilling fluid can provide suitable hydrostatic pressure and suspend cuttings, but the downhole pressure increases leading to mechanical washout and erosion of oilfield tubulars and pumping equipment
Solution Approach 1:
The patent removes solids and clays from the invert emulsion drilling fluid formulation. By extracting the harmful solid components while retaining the essential emulsion structure (oil continuous phase, water discontinuous phase, and emulsifier), the formulation achieves the necessary rheological properties and hydrostatic pressure without the erosive effects of solid particles on tubulars and equipment.
2Quantity of substance
If solids are suspended in the drilling fluid to increase density for hydrostatic pressure control, then the desired pressure control is achieved, but the solids increase mechanical washout tendency
Solution Approach 1:
The patent eliminates solid additives from the formulation while maintaining the invert emulsion structure. The density and hydrostatic pressure are controlled through the oil-to-aqueous phase ratio and composition rather than through suspended solids, thereby achieving pressure control without increasing mechanical washout tendency.
3Stability of the object's composition
If conventional invert emulsion fluids are formulated as mud with suspended solids, then rheological properties are improved, but the solids increase downhole pressure and erosion
Solution Approach 1:
The patent removes solids from the conventional mud formulation while preserving the invert emulsion architecture. The rheological properties are maintained through the emulsifier composition and phase ratio control, eliminating the need for solid suspensions that cause erosion and excessive downhole pressure.
Solution Approach 2:
The patent adjusts key formulation parameters including the oil-to-aqueous phase ratio (maintaining invert emulsion characteristics with more continuous oil phase), emulsifier concentration, and component selection to achieve desired rheological properties without solids. This parameter optimization allows the fluid to function as a non-solid-based drilling fluid.
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 reduces downhole pressure and mechanical washout/erosion by eliminating clays, maintaining stable rheology and suspension capabilities, enhancing wellbore cleaning and reducing the risk of equipment damage.
Implementation Method 1
Emulsifying agents may be used to lower the interfacial tension of the liquids so that the aqueous phase may form a stable dispersion of fine droplets in the oil
Implementation Method 2
to isolate the fluids from the formation by providing sufficient hydrostatic pressure to prevent the ingress of formation fluids into the wellbore
Implementation Method 3
to suspend cuttings and weighting material when circulation is interrupted
Implementation Method 4
The fluids may be circulated through a bore hole, which may subsequently flow upward through the wellbore to the surface. During this circulation, the drilling fluid may remove drill cuttings from the bottom of the hole to the surface
Implementation Method 5
to cool and lubricate the drill string and bit
Data Source
AI summary
The present disclosure provides drilling fluids including emulsions. The emulsions include an aqueous phase, an oil, an emulsifier composition, and a wetting agent. The emulsifier composition includes an amidoamine. The wetting agent includes a first organic acid. The first organic acid selected from the group consisting of C6-C30 carboxylic acid, C6-C30 alkeynl acid, C6-C30 arylakyl acid, and a C6-C30 cycloalkyl acid. The wetting agent includes an alcohol alkoxylate. A ratio of the oil to the aqueous phase is about 85:15 to about 60:40 of the oil to the aqueous phase