Amine Blend Clay Stabilization for Chloride-Free Shale Control
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Solution Overview
Problem
Existing shale hydration inhibitors and clay stabilizing agents often pose environmental risks due to high chloride content and are not as effective as needed, leading to formation damage and permeability reduction.
Innovation Solution
A water-based well treatment fluid containing a synergistic mixture of less than 20% unhindered primary amine and a second amine, which provides enhanced clay stabilization without chlorides, inhibiting swelling and migration of clay subterranean materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If potassium chloride is used as a shale inhibitor at high concentration (6%), then clay stabilization is achieved, but environmental harm increases due to high chloride levels
Solution Approach 1:
The patent changes the chemical composition parameters by replacing chloride-based inhibitors (KCl) with amine-based compounds. This substitution maintains the clay stabilization function while eliminating the harmful chloride component, directly resolving the contradiction between effectiveness and environmental harm
Solution Approach 2:
The patent employs biodegradable amine compounds that break down into harmless substances, replacing persistent chloride-based inhibitors. This approach allows effective clay stabilization while the inhibitor itself degrades environmentally, eliminating long-term chloride accumulation issues
2Reliability
If single amine compounds are used as clay stabilizers, then simplicity is maintained, but stabilization effectiveness is insufficient
Solution Approach 1:
The patent combines multiple amine compounds with different molecular weights and structures into a single formulation. This merging creates a synergistic effect where the blend provides superior clay stabilization compared to individual components, resolving the contradiction between effectiveness and simplicity
Solution Approach 2:
The patent creates a composite amine blend comprising different amine types (primary, secondary, tertiary) with varying chain lengths and molecular weights. This composite approach enhances overall stabilization performance by addressing multiple clay interaction mechanisms simultaneously, while still being implementable as a single additive package
3Reliability
If conventional shale inhibitors are used, then clay swelling is inhibited, but formation permeability is reduced due to fines migration
Solution Approach 1:
The patent uses amine compounds with specific molecular weight distributions to target different aspects of clay behavior. Lighter amines address swelling while heavier components address fines stabilization, creating localized effectiveness for each problem while maintaining overall formation permeability
Solution Approach 2:
The amine blend acts as an intermediary substance that mediates between water and clay surfaces. It provides a protective interface that prevents both swelling and fines detachment, allowing water-based fluids to contact formation without causing damage to either swelling or permeability
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 amine blend effectively reduces clay swelling and migration, offering improved environmental safety and performance, suitable for both land and offshore drilling operations.
Implementation Method 1
These work on the principle of the substitution of a cationic species in the clay lattice for a sodium ion. The cationic species is generally selected such that its radius of hydration is less than that of the sodium ion.
Implementation Method 2
The migration of fines in a subterranean formation is often the result of clay swelling, salt dissolution, and/or the disturbance of fines by the introduction of fluids that are foreign to the formation.
Implementation Method 3
It is believed that the molecules of the shale hydration inhibitors and stabilizing agents compete with molecules of water for reactive sites. Thus, the possibility of swelling and migration is minimized upon their contact with the formation.
Data Source
AI summary
The present disclosure provides water-based well treatment fluids methods of using such fluids in treating subterranean formations to prevent swelling and/or migration of fines. The water-based well treatment fluid contains an aqueous continuous phase and a clay stabilizing agent comprising less than 20% by weight, based on the total weight of the clay stabilizing agent, of an unhindered primary amine and a second amine selected from an alkanolamine, a polyalkylene polyamine, a compound having a formula R4—(CH2)d—NH2 where R4 is a piperazino group or a morpholino group and d is an integer from 0 to 10, a compound having the formula where h is an integer from about 2 to about 7 and a mixture thereof.