Polyaspartic Acid Derivative Lubricant for Drilling Fluids
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Solution Overview
Problem
Extended-reach wells in offshore oil and gas reservoirs face challenges with high frictional torque and wellbore instability during drilling, which conventional drilling fluids fail to address effectively, particularly due to environmental concerns and biological toxicity issues with existing lubricating agents.
Innovation Solution
A polyaspartic acid (PASP) derivative is developed, free from sulfonated groups, which is synthesized through polymerization of aspartic acid with water-soluble organic amines and used as a lubricant in water-based drilling fluids, enhancing lubricating, plugging, and inhibition performance while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating agents containing sulfonated groups are used, then lubricating performance is improved, but biological toxicity increases and environmental friendliness deteriorates
Solution Approach 1:
The patent removes the harmful sulfonated groups from the lubricating agent molecule while retaining the essential lubricating functionality through polyaspartic acid derivatives, thus eliminating biological toxicity while maintaining lubricating performance
Solution Approach 2:
The patent changes the chemical composition parameters of the lubricating agent by using polyaspartic acid derivatives with specific molecular structures (containing carboxyl groups instead of sulfonated groups), achieving both environmental friendliness and lubricating performance
2Object-affected harmful factors
If water-based drilling fluid is used, then environmental friendliness is improved, but frictional torque increases and wellbore stability deteriorates
Solution Approach 1:
The patent introduces polyaspartic acid derivatives as intermediary substances that mediate between the water-based drilling fluid and the wellbore surfaces, providing lubrication and stability without compromising environmental friendliness
Solution Approach 2:
The patent creates a composite system by combining water-based drilling fluid with polyaspartic acid derivatives, achieving enhanced lubricating performance and wellbore stability while maintaining environmental compatibility
3Productivity
If extended-reach wells are developed, then oil and gas productivity is improved, but frictional torque increases and wellbore stability deteriorates
Solution Approach 1:
The patent applies polyaspartic acid derivatives in advance during the drilling process to pre-establish a lubricating film and stabilize the wellbore, preventing high frictional torque and instability before they can hinder the extended-reach drilling operation
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 PASP derivative improves lubricating and plugging performance, reduces frictional torque, and stabilizes wellbores, making it suitable for extended-reach wells without the environmental hazards associated with sulfonated compounds, and demonstrates superior performance compared to conventional drilling fluids.
Implementation Method 1
the PASP derivative could be used as a lubricant for water-based drilling fluids, has excellent lubricating performance
Implementation Method 2
the PASP derivative... has an effect of the stability of wellbore
Data Source
AI summary
Provided are a polyaspartic acid derivative and a preparation method and use thereof as a lubricant, and a water-based drilling fluid and use thereof. The polyaspartic acid derivative has a structure shown in formula I, wherein, in the formula I, R1 is selected from the group consisting of —CH2—CH2—CH2—, —CH2—CH2—CH2—CH2—, and —CH2—CH2—CH2—CH2—CH2—CH2—; R2 is selected from the group consisting of —OH, —N—(CH2—CH2—OH)2, —O—CH2—CH2—NH—CH2—CH2—OH, —NH—CH2—CH2—OH, and —O—CH2—CH2—NH2; and n and m are independently 8 to 17.