Polymer Shale Stabilizers With Low-Viscosity Wellbore Fluids
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Solution Overview
Problem
Existing polymers used in aqueous-based wellbore fluids for shale stabilization face issues with water hardness tolerance and viscosity increase, particularly when drilling through shale formations, leading to problems like bit balling, stuck pipe, and reduced drilling efficiency.
Innovation Solution
The use of polymer-based additives, including polyvinylpyrrolidone and polyacrylic acid with specific molecular weights, as shale stabilizers and encapsulators, which are incorporated into wellbore fluids to improve shale stabilization by reducing dispersion, accretion, and agglomeration of shale cuttings, while maintaining low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymers are used for shale stabilization, then shale stabilization is improved, but viscosity increases and water hardness tolerance decreases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight of the polymer within a specific range (10,000 to 1,000,000 daltons) and adjusting the concentration (0.01 to 10 weight percent). This optimization allows the polymer to provide effective shale stabilization while maintaining acceptable viscosity levels and tolerance to water hardness, thus resolving the contradiction between stabilization effectiveness and fluid composition stability.
2Reliability
If polymer-based additives are used to prevent clay swelling, then shale stabilization is improved, but fluid viscosity increases
Solution Approach 1:
The patent optimizes polymer concentration parameters (0.01 to 10 weight percent) and molecular weight parameters to achieve the right balance between shale stabilization effectiveness and maintaining low enough viscosity for efficient drilling operations. This parameter optimization resolves the contradiction between reliability and productivity.
3Reliability
If polymer additives are used to prevent cuttings dispersion, then wellbore stability is improved, but operational downtime increases due to bit balling
Solution Approach 1:
The patent adjusts polymer concentration (0.01 to 10 weight percent) and molecular weight (10,000 to 1,000,000 daltons) to achieve optimal cuttings control that prevents both dispersion and excessive agglomeration. This optimization prevents bit balling while maintaining wellbore stability, thus resolving the contradiction between reliability and time loss.
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 polymer-based additives effectively stabilize shales by preventing clay swelling and cuttings dispersion, enhancing drilling efficiency, and reducing operational downtime, without significantly increasing fluid viscosity.
Implementation Method 1
The polymer-based additives effectively stabilize shales by preventing clay swelling and cuttings dispersion
Data Source
AI summary
Polymer-based additives improve shale stabilizations by being incorporated into wellbore fluid compositions for one or more wellbore operations or applications. Methods of producing said compositions and using said compositions to stabilize shale associated with wellbores disposed within subterranean formations are also provided. Wellbore fluid compositions comprising aqueous base fluids and the polymer-based additives and methods of introducing or circulating said compositions into the wellbores for stabilizing shales associated with the wellbores are further provided.