Low pH Acidic Spotting Fluid for Stuck Drill Pipe Release
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Solution Overview
Problem
Current drilling fluids, such as water-based muds, oil-based muds, and synthetic-based muds, face challenges in effectively releasing stuck drill pipes while minimizing environmental impact, toxicity, and operational costs, particularly in deep or complex drilling situations, where they often require recycling and onshore disposal, leading to increased costs and regulatory barriers.
Innovation Solution
A low pH acidic composition, mixed with water to form an aqueous solution, is used as a spotting fluid to break down filter cakes and release stuck drill pipes, incorporating a non-toxic, antimicrobial agent and a dehydrating agent like potassium chloride, which prevents rebinding, and can be used with brine or sea water as a continuous phase, ensuring compliance with environmental regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil-based muds (OBMs) are used for deep well drilling, then drilling performance is improved, but environmental impact and toxicity increase
Solution Approach 1:
The invention changes the chemical composition parameters of the drilling fluid by using synthetic-based esters instead of traditional oil-based muds. This parameter change maintains the lubrication and drilling performance properties while fundamentally altering the environmental compatibility, allowing the fluid to meet EPA discharge requirements without sacrificing drilling effectiveness
Solution Approach 2:
The invention creates a composite drilling fluid system that combines synthetic esters with biodegradable additives and corrosion inhibitors. This composite approach integrates the superior lubrication properties of synthetic-based fluids with environmentally benign components, achieving both high reliability drilling performance and reduced environmental harm
2Object-affected harmful factors
If water-based muds (WBMs) are used, then environmental safety is improved, but drilling performance in deep wells deteriorates
Solution Approach 1:
The invention transforms the base fluid from water-based to synthetic-ester-based, changing the fundamental chemical parameters to achieve both environmental compatibility and high-temperature stability. This parameter change enables the fluid to maintain performance in deep well conditions while remaining environmentally safe
Solution Approach 2:
The invention uses biodegradable synthetic esters that can be discharged on-site after use, eliminating the need for costly recycling and disposal operations. The fluid is designed to be environmentally safe enough for direct discharge, converting a previously problematic waste management issue into a simple on-site disposal solution
3Reliability
If oil-based muds (OBMs) are used, then drilling performance is improved, but disposal costs and regulatory barriers increase
Solution Approach 1:
The invention changes the chemical composition to meet EPA discharge criteria, fundamentally altering the regulatory status of the drilling fluid from requiring costly onshore disposal to permitting on-site discharge. This parameter change eliminates recycling requirements and associated disposal costs
Solution Approach 2:
The drilling fluid is designed to be self-disposable through its inherent biodegradability and environmental safety. The fluid performs its drilling function and then can be discharged directly on-site without requiring external recycling or disposal facilities, making the system self-sufficient and eliminating costly waste management 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 solution effectively breaks down filter cakes, reduces downtime, and allows on-site disposal of drill cuttings and fluids, ensuring safety for humans and the environment, while meeting regulatory guidelines and providing superior drilling performance.
Implementation Method 1
a low pH acidic composition, mixed with water to form an aqueous solution, is used as a spotting fluid to break down filter cakes and release stuck drill pipes
Implementation Method 2
incorporating a non-toxic, antimicrobial agent and a dehydrating agent like potassium chloride, which prevents rebinding
Implementation Method 3
a low pH acidic composition with antimicrobial properties
Data Source
AI summary
An aqueous mixture of a non-toxic, low pH, antimicrobial, acidic composition having a pH between approximately 0.5 and approximately 3.5 is used in a drilling fluid and a stuck pipe additive. One embodiment of the stuck pipe additive composition includes an alkali metal halide salt in a range of approximately 10-35 weight %; a sequenching agent in a range between 2-8 weight %, a low pH, non-toxic acid composition in a range of 0.5-20 weight percent and water in a range of 7-88.5 weight %. As a drilling fluid, it maintains well control and removes drill cuttings from holes drilled into the earth. As a spotting fluid, it frees a stuck drill stem in the annulus of a bore hole in minutes.