Flow Straightener Reduces Turbulence in Mud Pump Suction
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Solution Overview
Problem
Conventional mud pumps create turbulence and pressure pulsations in drilling fluids due to reciprocating motion, leading to reduced efficiency, disturbed downhole instrumentation, and potential fatigue damage to drill strings.
Innovation Solution
A flow straightener apparatus with flexible coupling and radially extending pins supporting vanes within a conduit segment, which subdivides the fluid flow into channels to reduce turbulence and absorb pressure pulsations, using elastomeric inserts and tapered vanes to minimize fluid disruption and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional mud pumps with reciprocating motion are used to deliver drilling mud, then the drilling mud can be pressurized and delivered to the drill string, but turbulence and pressure pulsations are created in the drilling fluid
Solution Approach 1:
The flow straightener is installed upstream of the mud pump to pre-condition the drilling mud flow before it enters the pump. The vanes and pins create a flow conditioning section that eliminates turbulence and aligns flow vectors in advance, preventing these harmful conditions from entering the pump and being amplified by the reciprocating motion.
Solution Approach 2:
The flow straightener acts as an intermediary device between the suction manifold and the mud pump. It includes a section of conduit with multiple pins extending radially inward, each supporting a vane that extends along the flow direction. This intermediary structure conditions the flow by subdividing it into channels and straightening the velocity vectors, thereby mediating between the turbulent upstream conditions and the pump's sensitivity to flow quality.
2Adaptability or versatility
If the suction module includes piping elbows, bends, and Ts to route drilling mud, then the suction module can be configured for compact installation, but the drilling mud becomes highly turbulent when flowing through these components
Solution Approach 1:
The flow straightener segments the turbulent flow into multiple smaller channels using pins that extend radially inward from the conduit wall. Each pin supports vanes that further subdivide the flow paths. This segmentation breaks up large-scale turbulent eddies and creates numerous smaller, more controlled flow channels, reducing overall turbulence intensity while maintaining the compact piping configuration upstream.
Solution Approach 2:
The flow straightener addresses the turbulence problem by introducing a new dimensional approach - extending pins and vanes in the radial dimension rather than merely modifying the axial flow path. This radial extension creates three-dimensional flow conditioning that effectively manages turbulence generated by the upstream elbows, bends, and Tees without requiring changes to the existing piping layout.
3Productivity
If bubbles form in the compression chamber due to turbulent drilling fluid flowing around the suction valve poppet, then the suction valve can open rapidly, but pressure pulsations are created when the bubbles burst during compression
Solution Approach 1:
The flow straightener performs preliminary action by conditioning the drilling mud flow before it reaches the suction valve. The vanes and pins straighten the flow vectors and eliminate turbulence upstream of the valve, preventing bubble formation during valve opening. This preliminary flow conditioning ensures that when the suction valve opens rapidly, the fluid is already laminar and bubble-free, eliminating the harmful pressure pulsations that would occur during compression.
4Productivity
If pressure pulsations are propagated by the drilling mud, then the mud pump can operate cyclically, but downhole communication devices and instrumentation are disturbed and measurement accuracy is degraded
Solution Approach 1:
The flow straightener segments the cyclically pulsating flow into multiple smaller channels using radially extending pins and vanes. This segmentation distributes the pressure pulsations across numerous smaller flow paths rather than allowing them to propagate as large-scale disturbances. The result is that cyclic pump operation is maintained for productivity, but the segmented flow structure significantly reduces the amplitude and impact of pressure pulsations on downhole instrumentation and communication devices.
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 solution effectively reduces turbulence and pressure pulsations, enhancing the efficiency of mud pumps, minimizing disturbances to downhole instruments, and reducing the risk of fatigue damage to drill strings.
Implementation Method 1
A flow straightener apparatus with flexible coupling and radially extending pins supporting vanes within a conduit segment, which subdivides the fluid flow into channels to reduce turbulence
Implementation Method 2
A flow straightener apparatus with flexible coupling and radially extending pins supporting vanes within a conduit segment, using elastomeric inserts to minimize fluid disruption and resistance
Data Source
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AI summary
A system for conveying fluid includes a conduit segment and a pump disposed downstream of and fluidicly coupled to the conduit segment. The conduit segment has an interior volume for conveying the fluid in a predetermined direction of flow and a plurality of elongate vanes disposed within the interior volume.