Polysiloxane Anti-Accretion Additive for Bitumen Drilling Fluids
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Solution Overview
Problem
Drilling in bitumen-containing formations, such as those found in SAGD operations, is hindered by the sticky nature of bitumen, which causes accretion on drilling apparatus and surfaces, leading to delays and inefficiencies due to the limitations of existing anti-accretion additives that either generate waste streams or compromise drilling fluid properties.
Innovation Solution
A polysiloxane-based anti-accretion additive is introduced into aqueous drilling fluids, utilizing silicone chemistry to prevent bitumen from sticking to metal surfaces and allowing easy separation using conventional solids control equipment, without adversely affecting the drilling fluid's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional drilling fluids are used in bitumen-containing formations, then bitumen accretion on drilling apparatus is prevented, but drilling efficiency is significantly reduced due to sticky bitumen accumulation
Solution Approach 1:
The patent introduces a specific additive as an intermediary substance between the bitumen and the drilling apparatus. This additive modifies the interaction interface, preventing direct adhesion of bitumen to metal surfaces while maintaining the drilling fluid's overall performance characteristics.
Solution Approach 2:
The patent modifies the chemical composition parameters of the drilling fluid by incorporating specific additives with controlled concentrations. These parameter changes alter the surface properties and rheological characteristics, enabling the fluid to resist bitumen accretion while maintaining drilling efficiency.
2Reliability
If solvent and/or surfactant chemistry is used to separate bitumen from sand, then bitumen flows easily and does not stick, but odor problems and tank cleaning issues arise due to solvated bitumen floating on returned drilling fluid
Solution Approach 1:
The patent converts the harmful floating behavior of solvated bitumen into a beneficial separation mechanism. By carefully controlling the solvation process, the bitumen that would normally float and cause odor problems is instead managed to separate in a controlled manner that eliminates the harmful effects while maintaining the anti-accretion benefit.
Solution Approach 2:
The patent implements a system where solvated bitumen is deliberately separated and removed from the drilling fluid circuit in a controlled process. This discarding of the solvated bitumen phase eliminates odor and tank cleaning issues, while the treated drilling fluid is recovered and reused.
3Reliability
If cationic polyacrylamide is used to water-wet bitumen and prevent sticking, then bitumen and sand remain intact without dispersion, but drilling fluid becomes susceptible to flocculation of anionic polymers causing plugging of shale shakers
Solution Approach 1:
The patent achieves the water-wetting effect of cationic polyacrylamide without using the problematic cationic polymer itself. Instead, it employs alternative additives that replicate the beneficial surface modification effects while avoiding the harmful flocculation interactions with anionic polymers in the drilling fluid system.
4Reliability
If bitumen is solvated to prevent sticking, then bitumen does not stick to surfaces, but bitumen is retained in the returned drilling fluid requiring complex separation processes
Solution Approach 1:
The patent implements an extraction mechanism that selectively removes solvated bitumen from the drilling fluid. By introducing separation media or processes that target the solvated bitumen phase, the unwanted substance is extracted from the system, allowing the drilling fluid to be reused without bitumen contamination.
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 polysiloxane additive effectively inhibits bitumen accretion on metal surfaces, enabling efficient drilling operations by minimizing bitumen retention and allowing for easy removal of bitumen from the drilling fluid, thus improving drilling efficiency and reducing waste generation.
Implementation Method 1
A bitumen anti-accretion additive for addition to aqueous drilling fluids minimizes retention of bitumen to metal surfaces using silicone chemistry
Implementation Method 2
effectively inhibits bitumen accretion on metal surfaces, enabling efficient drilling operations by minimizing bitumen retention
Implementation Method 3
allowing easy separation using conventional solids control equipment
Data Source
AI summary
Anti-accretion additives utilize silicone chemistry to prevent bituminous and heavy oil materials from sticking to metals surfaces such as drill bits, drillstring, casing and the like. Organopolysiloxanes and/or copolymers thereof are added directly to an aqueous drilling fluid or are first diluted in a solvent for adding to the drilling fluid. Further, an alkyl polyalkylene oxide may also be added. If a silicone oil is used as the solvent, the anti-accretion additive has the increased functionality of minimizing the amount of bituminous or heavy oil material which is retained in the drilling fluid when returned to surface and permits removal of the bituminous or heavy oil materials with the solids using conventional solids control equipment.