Biodegradable Drilling Lubricant Composition for Deepwater Friction Control
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Solution Overview
Problem
Current drilling fluids used in deep offshore drilling operations face challenges with high friction forces due to low temperatures, toxicity concerns for marine life, and high costs associated with synthetic biodegradable lubricants, which affect their biodegradability and viscosity control.
Innovation Solution
A biodegradable lubricant composition comprising a mixture of a hydrocarbon mineral oil and fatty acids or esters, with a majority being non-aromatic and having a specific range of monocarboxylic fatty acids, which provides excellent lubricating properties while maintaining low toxicity and cost-effectiveness, suitable for use in drilling fluids as a reverse or direct emulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic biodegradable lubricants are used to improve lubricating properties and reduce toxicity, then biodegradability and lubricating power are improved, but cost increases significantly
Solution Approach 1:
The patent uses a composite lubricant composition combining hydrocarbon mineral oil (80-95% by weight) with fatty acid esters (5-20% by weight). This composite approach achieves biodegradability and lubricating performance without relying on expensive synthetic materials, resolving the contradiction between environmental compatibility and cost-effectiveness.
Solution Approach 2:
The patent modifies the chemical composition parameters by selecting specific hydrocarbon fractions with controlled aromatic content (less than 10% by weight) and combining them with fatty acid esters. This parameter optimization enables the formulation of a cost-effective biodegradable lubricant that meets performance requirements without using expensive synthetic additives.
2Force
If drilling fluids are used in deep offshore drilling to reduce friction forces, then lubricating power is improved, but toxicity to marine life increases
Solution Approach 1:
The patent employs biodegradable lubricant compositions that can be safely discharged into the environment without long-term harmful effects. The use of hydrocarbon mineral oils with controlled aromatic content and fatty acid esters ensures the lubricant breaks down naturally, eliminating chronic toxicity to marine life while maintaining effective friction reduction during drilling operations.
Solution Approach 2:
The patent converts potentially harmful aromatic hydrocarbons into beneficial non-aromatic hydrocarbon fractions through selective refining. By removing aromatic compounds (reducing them to less than 10% by weight) while retaining the lubricating hydrocarbon base, the formulation transforms a toxic substance into an environmentally compatible lubricant that maintains friction reduction capabilities.
3Reliability
If drilling operations proceed at low temperatures to maintain well control, then well stability is improved, but viscosity control becomes difficult
Solution Approach 1:
The patent selects hydrocarbon mineral oils with specific viscosity characteristics and aromatic content (less than 10% by weight) that maintain stable viscosity at low temperatures. The combination with fatty acid esters further optimizes the viscosity-temperature relationship, ensuring predictable fluid behavior during deep offshore drilling operations where temperature control is critical for well stability.
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 lubricant composition offers a balance between lubricating power and biodegradability, maintaining low pour points and kinematic viscosity at low temperatures, and achieving high aerobic biodegradability rates, thus addressing the challenges of toxicity and cost in deep offshore drilling operations.
Implementation Method 1
reducing the metal-metal friction forces between the casing and the drilling rods, and the metal-rock friction forces both at the bit and in the ring-shaped area
Implementation Method 2
cooling the bit
Data Source
AI summary
The present disclosure relates to a biodegradable lubricant composition, notably intended to be incorporated as an oil phase with high lubricating power in a drilling fluid or mud. This composition may be in a drilling fluid or as a fluid for fracture of underground formations. These muds or fluids contained in the composition of the present disclosure are particularly suitable for very deep drillings, offshore in deep water and/or sidetracked drillings or with a long shift.