Ether Monocarboxylic Acid Lubricant for Brine Drilling Fluids
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Solution Overview
Problem
Current lubricants used in brine-based drilling fluids and completion fluids are not environmentally friendly, lack compatibility with clear brines, and often increase environmental concerns and costs, failing to effectively reduce torque and drag while preventing differential sticking of downhole tubulars.
Innovation Solution
A composition comprising at least 10 wt % of a water-soluble salt and an ether monocarboxylic acid, its amide, or ester, which provides improved lubricity and biodegradability, specifically designed for use in brine-based drilling fluids, completion fluids, and workover fluids, without forming precipitates that could clog drill stems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional lubricants are used in brine-based drilling fluids, then lubrication performance is achieved, but environmental compatibility deteriorates and costs increase
Solution Approach 1:
The invention changes the chemical parameters of the lubricant by using ether monocarboxylic acids with specific molecular structures (x≥5, y=0-3, R1=1-4 carbon atoms) instead of conventional lubricants. This parameter change enables the lubricant to be compatible with brine-based drilling fluids while maintaining effective lubrication performance and achieving environmental compatibility through biodegradability.
Solution Approach 2:
The invention creates a composite lubricant system by combining ether monocarboxylic acid with water-soluble salts (at least 10 wt%) to form a composition that is compatible with brine-based drilling fluids. This composite approach allows the lubricant to function effectively in salt-based environments while being environmentally friendly.
2Force
If lubricating agents are added to reduce torque and drag, then friction is reduced, but compatibility with clear brines deteriorates
Solution Approach 1:
The invention changes the chemical parameters by selecting ether monocarboxylic acids with specific structural parameters (x≥5, y=0-3, R1=1-4 carbon atoms) that enable solubility in clear brines. This allows the lubricant to reduce friction and torque while remaining compatible with brine-based drilling fluids without precipitation or incompatibility issues.
3Object-affected harmful factors
If environmentally friendly lubricants are used, then biodegradability is improved, but lubrication effectiveness may deteriorate
Solution Approach 1:
The invention optimizes the molecular parameters of the ether monocarboxylic acid (x≥5, y=0-3, R1=1-4 carbon atoms, R=6-22 carbon atoms) to achieve a balance between biodegradability and lubrication effectiveness. The specific parameter range ensures the lubricant is environmentally friendly while maintaining sufficient film strength and lubrication performance for drilling operations.
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 ether monocarboxylic acid-based composition effectively reduces metal-to-metal friction, prevents differential sticking, and exhibits excellent biodegradability, making it an environmentally friendly and cost-effective lubricant for brine-based drilling operations.
Implementation Method 1
an ether monocarboxylic acid of the general formula (I), an amide, a salt or an ester thereof wherein R is a saturated or unsaturated, branched or unbranched alkyl or alkenyl radical having from 6 to 22 carbon atoms; x is an integer number of at least 5; y is an integer number between 0 and 3; R1 is an alkyl radical having from 1 to 4 carbon atoms; Z is a hydrogen atom or a monovalent or polyvalent cation
Data Source
AI summary
The present invention relates to a composition comprising (i) at least 10 wt % of an inorganic and/or organic, water soluble salt, based on the total weight of the composition; (ii) water; and (iii) an ether monocarboxylic acid. Further aspects of the invention relate to the use of an ether monocarboxylic acid of the invention, an amide, a salt or an ester thereof as a lubricant preferably in salt based drilling systems.