Vibrating Wire Viscometer Segmented Housing for Downhole Accuracy
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Solution Overview
Problem
Downhole environments in petroleum and natural gas exploration pose challenges for viscosity measurement tools due to extreme conditions like heat, shock, pressure, and vibration, leading to tool deterioration and loss of measurement accuracy.
Innovation Solution
The development of vibrating wire viscometers with a metallic housing, flowline, and conductive wire held in tension between insulated posts, subjected to a magnetic field, which vibrates in response to an alternating current to measure viscosity by analyzing damping, and encapsulated to protect from corrosive fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the viscometer tool is exposed to downhole fluid for measurement, then viscosity measurement accuracy is improved, but the tool components (magnet, wire, electronics) are damaged by heat, shock, pressure, and vibration
Solution Approach 1:
The viscometer is divided into two distinct segments: a protected housing containing sensitive components (magnet, wire, electronics) and a flowline that interfaces with downhole fluid. This segmentation allows the measurement function to be exposed to the fluid while protecting vulnerable components from harsh conditions.
Solution Approach 2:
A seal acts as an intermediary barrier between the downhole fluid and the protected components. The seal prevents direct contact between the fluid and sensitive parts while still allowing the tool to function in the downhole environment, thus protecting against heat, shock, pressure, and vibration damage.
2Measurement precision
If the wire is held in tension to maintain vibration stability, then measurement precision is improved, but the wire may break under extreme downhole conditions
Solution Approach 1:
The vibrating wire is designed as a replaceable, sacrificial component that can be easily replaced if damaged. This allows the system to maintain high measurement precision through tensioned wires while accepting that the wire itself may be consumed or damaged under extreme conditions.
Solution Approach 2:
The wire tension is carefully controlled within optimal parameters to maintain vibration stability for accurate measurement. By optimizing the tension parameter, the system achieves the best balance between measurement precision and wire durability under downhole conditions.
3Adaptability or versatility
If the magnet is exposed to the flowline for generating magnetic field across the wire, then viscosity measurement capability is improved, but the magnet deteriorates due to corrosion from downhole fluid
Solution Approach 1:
The magnet is extracted from direct exposure to the downhole fluid and placed within a protected housing. This extraction removes the harmful corrosive environment from the magnet while preserving its essential function of generating the magnetic field needed for viscosity measurement through the flowline.
Solution Approach 2:
The housing and seal structure serve as an intermediary barrier that protects the magnet from corrosive downhole fluid. This intermediary allows the magnetic field generation function to continue operating effectively while preventing direct contact between the magnet and harmful fluids.
4Reliability
If the housing is sealed to protect components, then tool reliability is improved, but fluid flow to the wire is restricted
Solution Approach 1:
The housing is segmented into a sealed compartment for protecting components and an open flowline section for unrestricted fluid flow. This segmentation allows the wire to be exposed to sufficient downhole fluid for accurate viscosity measurement while the sealed housing protects the magnet and electronics from corrosion and damage.
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 provides accurate viscosity measurements in harsh downhole conditions by maintaining wire tension and using encapsulation to prevent fluid damage, ensuring reliable data collection.
Implementation Method 1
a magnet to generate a magnetic field across the flowline
Implementation Method 2
an electrically conductive wire held in tension between the first and second electrically conductive posts to vibrate in response to an electrical signal
Implementation Method 3
an electrically conductive wire held in tension between the first and second electrically conductive posts to vibrate in response to an electrical signal
Implementation Method 4
measure viscosity by analyzing damping
Data Source
AI summary
Vibrating wire viscometers are described. Some example vibrating wire viscometer housings include a flowline through the housing to expose a first wire to a downhole fluid, a cavity in the housing to hold a magnet and to conduct one or more additional wires from the flowline to a signal generator, first and second electrically conductive posts mechanically coupled to the housing to hold the first wire in tension within the flowline, and a seal mechanically coupled to the housing to prevent access to the magnet by the downhole fluid.