Drilling Fluid Viscosity Control via Centrifugal Feedback
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Solution Overview
Problem
Drilling fluids used in wellbore construction often experience fluctuations in viscosity and gel strength due to hydration of clays, leading to undesirable saw-tooth effects in mud properties, requiring manual adjustments and compromising drilling performance.
Innovation Solution
A centrifuge system controlled by computer-executable instructions adjusts the speed and feed rate to maintain optimal viscosity and density of drilling fluids, using sensors to compare actual values against set points, reducing operator intervention and maintaining consistent mud properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment of centrifuge pump speeds is used to optimize centrifuge treating performance, then viscosity control can be achieved, but operator intervention is required frequently and saw-tooth effects occur in mud properties
Solution Approach 1:
The system enables self-service operation through automatic centrifuge control. The computer-executable instructions continuously monitor mud density and viscosity, automatically adjusting centrifuge pump speeds to maintain optimal mud properties without operator intervention, eliminating the saw-tooth effects caused by manual adjustments
Solution Approach 2:
The system implements continuous feedback control by monitoring mud density and viscosity parameters and using this information to automatically adjust centrifuge operating parameters. This closed-loop control ensures consistent mud properties while eliminating the need for frequent manual interventions
2Reliability
If centrifuge operates at high speed to remove solids and control viscosity, then mud viscosity can be reduced, but equipment wear increases and maintenance frequency increases
Solution Approach 1:
The system dynamically adjusts centrifuge pump speeds based on real-time mud density and viscosity measurements. Rather than operating at constant high speed, the centrifuge speed is optimized to match actual mud conditions, reducing unnecessary equipment wear while maintaining effective viscosity control
Solution Approach 2:
The system changes centrifuge operating parameters (speed, feed rate) based on measured mud properties. By adjusting these parameters dynamically rather than maintaining fixed high-speed operation, the system achieves effective solids removal and viscosity control while extending equipment maintenance intervals
3Reliability
If clay constituents are hydrated to increase viscosity and gel strength, then mud can suspend drill cuttings effectively, but viscosity becomes too high and drilling performance deteriorates
Solution Approach 1:
The system extracts excess solids and clay constituents from the mud using the centrifuge. By removing these viscosity-contributing materials, the system maintains optimal viscosity and gel strength for cutting suspension while preventing the mud from becoming too thick and deteriorating drilling performance
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 system automatically controls viscosity and density, ensuring consistent mud properties and reducing the need for manual adjustments, thereby improving drilling performance and extending equipment maintenance intervals.
Implementation Method 1
a centrifuge for removing solids from the drilling fluid material
Implementation Method 2
a viscosity sensor for sensing viscosity of the drilling fluid material in the container
Data Source
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AI summary
A method for controlling viscosity (or density) of drilling fluid containing solids, said drilling fluid circulating in a drilling fluid system, which method comprises the steps of: (a) feeding drilling fluid into a container (16); (b) sensing with a viscosity (or density) sensor (19) a viscosity (or density) of drilling fluid in said container (16) and providing a viscosity (or density) signal representative thereof; (c) in response to said viscosity (or density) signal pumping a portion of said drilling fluid to a solids separation apparatus (40); (d) separating with said solids separation apparatus (40) at least some of the solids from said portion of drilling fluid; and (e) returning to said drilling fluid system drilling fluid and/or solids separated in step (d) to adjust the viscosity (or density) of said drilling fluid in said container (16).