Urea-HCl Acid Composition for Corrosion Protection and Water Reduction
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Solution Overview
Problem
The oil and gas industry faces challenges in reducing water waste and minimizing equipment time during hydraulic fracturing operations, while also ensuring optimal acid diversion across all perforations.
Innovation Solution
A method involving the concurrent insertion of a zonal isolation plug, a perforating tool, and a spearhead or breakdown acid composition into the wellbore, followed by the use of a urea-HCl acid composition with a corrosion inhibitor package to minimize corrosion on stainless steel and common casing metallurgy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acidizing methods are used with traditional corrosion inhibitors, then corrosion protection is provided, but water consumption increases and stimulation time extends
Solution Approach 1:
The patent changes the chemical parameters of the acid composition by using urea-HCl instead of traditional HCl, and modifies the corrosion inhibitor package composition to achieve effective corrosion protection with reduced water consumption. The specific parameter changes include acid concentration, inhibitor concentration ratios, and chemical composition that enable the system to maintain protection while using less water.
Solution Approach 2:
The patent creates a composite treatment fluid system combining urea-HCl acid composition with a specially formulated corrosion inhibitor package. This composite material approach integrates multiple functional components (acid, inhibitors, additives) into a unified system that achieves both corrosion protection and water reduction simultaneously.
2Reliability
If conventional acidizing methods are used with traditional corrosion inhibitors, then corrosion protection is provided, but stimulation time increases
Solution Approach 1:
The patent implements preliminary action by pre-formulating the urea-HCl acid composition with the corrosion inhibitor package already integrated, and pre-positioning the treatment system in the wellbore. This allows immediate stimulation to begin without waiting for separate inhibitor injection or system preparation, thereby reducing overall stimulation time while maintaining corrosion protection.
Solution Approach 2:
The patent ensures continuity of useful action by designing a system where corrosion protection is continuously provided throughout the stimulation process without interruption. The integrated urea-HCl formulation with embedded inhibitors maintains protective function continuously during acid injection and stimulation, eliminating downtime associated with traditional multi-step processes.
3Productivity
If conventional acidizing methods are used, then acid can be pumped into the well, but optimal acid diversion across all perforations is difficult to achieve
Solution Approach 1:
The patent applies local quality by formulating the acid composition and corrosion inhibitor package with specific spatial distribution characteristics that enable uniform acid diversion across multiple perforations. The chemical composition is designed to maintain consistent properties (viscosity, reactivity, inhibitor concentration) throughout the injection process, ensuring each perforation receives appropriate acid treatment regardless of position or flow conditions.
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
This method reduces water usage, decreases stimulation time, and allows for immediate stimulation after perforation, leading to significant cost savings and increased operational efficiency.
Implementation Method 1
allowing the spearhead acid to come into contact with the wireline, perforating tools and perforated area for a predetermined period of time
Implementation Method 2
a urea-HCl acid composition with a corrosion inhibitor package to minimize corrosion on stainless steel and common casing metallurgy
Data Source
AI summary
A method of the invention prepares a hydrocarbon-bearing formation for stimulation. A bottom hole assembly comprising a plug and a perforation tool connected to a wireline is lowered into the wellbore. Acid is injected into the wellbore such that the acid is in direct contact with the perforation tool, wireline and casing of the wellbore. The plug is positioned downhole beyond a location where a first perforation area is to be made in the casing. The perforation tool is activated creating the first perforation area. The acid then contacts the first perforation area and cementitious debris generated from the casing being perforated. The perforation tool is next moved up-hole to a second location and the casing is again perforated to create a second perforation area. The acid also contacts the second perforated area and cementitious debris generated from the perforated casing. The perforation tool is lastly removed from the wellbore.