Biodegradable Clay Stabilizer for Shale Integrity
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Solution Overview
Problem
Swelling clays and shales in subterranean formations cause formation damage and drilling complications due to loss of permeability and instability, leading to increased drilling time and costs, with existing solutions like oil-based fluids being environmentally undesirable and clay stabilizers being toxic or non-biodegradable.
Innovation Solution
A method using a clay stabilizer with specific structural features, such as aminohydrocarbylenoxy or aminopoly(hydrocarbylenoxy) compounds, is introduced to inhibit clay and shale disaggregation, providing effective stabilization with reduced toxicity and biodegradability concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If oil-based fluids are used to inhibit clay swelling and shale degradation, then clay stability and shale integrity are improved, but environmental toxicity and environmental undesirability worsen
Solution Approach 1:
The invention changes the chemical composition parameters of the drilling fluid from oil-based to a specialized aqueous formulation containing specific clay stabilizers (amines, polyamines, amine oxides) and shale stabilizers (polymers with specific functional groups), achieving clay stabilization and shale integrity without the environmental toxicity of oil-based fluids
Solution Approach 2:
The invention uses biodegradable clay stabilizers and shale stabilizers that break down into harmless substances after performing their stabilization function, replacing persistent toxic oil-based fluids with environmentally friendly alternatives that provide sufficient protection during the drilling operation then degrade naturally
2Stability of the object's composition
If conventional clay stabilizers are used to prevent clay swelling, then clay stability is improved, but cost and environmental toxicity worsen
Solution Approach 1:
The invention optimizes the molecular weight, functional group composition, and concentration parameters of the clay stabilizer to achieve effective clay stabilization at lower costs, using readily available amines and polyamines rather than expensive proprietary conventional stabilizers
Solution Approach 2:
The invention creates a composite drilling fluid system combining multiple stabilizers (clay stabilizers with amine groups, shale stabilizers with polymer backbones and functional groups) that work synergistically to provide comprehensive stabilization at lower overall cost than single-component conventional systems
3Stability of the object's composition
If conventional clay stabilizers are used to stabilize clays, then clay stability is improved, but biodegradability worsens
Solution Approach 1:
The invention changes the chemical structure parameters of the clay stabilizer by selecting amines and polyamines with biodegradable molecular structures that lack persistent aromatic rings or complex synthetic groups, enabling natural microbial degradation after the stabilizer completes its clay protection function
Solution Approach 2:
The invention employs biodegradable clay stabilizers that perform their stabilization duty during drilling operations then naturally break down into harmless amino acids and other biodegradation products, eliminating long-term environmental persistence issues associated with conventional non-biodegradable stabilizers
4Stability of the object's composition
If shales are degraded by drilling fluids, then borehole instability and drilling complications increase, but drilling time and costs worsen
Solution Approach 1:
The invention applies shale stabilizers to the drilling fluid formulation before drilling operations begin, creating a protective environment that prevents shale degradation from occurring in the first place, thereby avoiding borehole collapses, cave-ins, and circulation interruptions that would cause drilling delays
Solution Approach 2:
The invention incorporates shale stabilizers that preemptively counteract the water-sensitive nature of certain shales by providing molecular protection against water absorption and swelling, preventing the chain reaction of shale degradation, borehole instability, and drilling complications before they can manifest
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 clay stabilizer effectively stabilizes clays and shales, reducing drilling complications and environmental impact, while being cost-effective and biodegradable, thus improving drilling efficiency and safety.
Implementation Method 1
The clay stabilizer can stabilize or inhibit clay disaggregation... by absorbing into water-absorbent sites in the clay to thus prevent or reduce water absorption into the clay
Implementation Method 2
The polymers can terminate in any suitable way... wherein the polymers can stabilize or inhibit clay disaggregation
Data Source
AI summary
Various embodiments disclosed relate to clay stabilizers. In various embodiments, the present invention provides a method of treating a subterranean formation, including obtaining or providing a composition including a clay stabilizer having the structure Y—R1—(O—R2)x—Y. The variable R1 can be a substituted or unsubstituted (C1-C20)hydrocarbylene. At each occurrence, R2 can independently be a substituted or unsubstituted (C1-C20)hydrocarbylene. At each occurrence, Y can be independently selected from a substituted or unsubstituted amino group, a substituted or unsubstituted ammonium group, a nitro group, a substituted or unsubstituted amine oxide group, and a substituted or unsubstituted (C1-C20)hydrocarbyloxy group, wherein at least one terminal group Y is a substituted amino group, a substituted or unsubstituted ammonium group, a substituted or unsubstituted amine oxide group, or a nitro group. The variable x can be an integer between 1 and 200,000. The method also includes placing the composition in a subterranean formation.