Automatic Rheological Parameter Measuring System for High-Temperature Drilling Fluids
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Solution Overview
Problem
Current methods for measuring rheological parameters of drilling fluids at high temperatures and pressures are inaccurate due to their inability to simulate actual downhole conditions and lack of real-time monitoring, especially when additives are used, leading to dynamic changes in fluid performance.
Innovation Solution
An automatic measuring system comprising a slurry tank, mud heat exchanger, plunger pump, flow test device, and control module that simulates high-temperature and high-pressure conditions, allowing real-time monitoring of pressure and flow rate to determine the most realistic rheological model and parameters using inversion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sampling measurement method is used, then measurement simplicity is improved, but measurement precision deteriorates due to inability to maintain downhole temperature and pressure conditions
Solution Approach 1:
The patent creates a downhole simulation environment that copies the actual downhole temperature and pressure conditions in a surface-based measurement system. By replicating the extreme conditions rather than transporting samples, the system maintains measurement simplicity while achieving accurate rheological parameter measurements under representative conditions.
Solution Approach 2:
The system dynamically adjusts temperature and pressure parameters in the simulation chamber to match downhole conditions. By changing these physical parameters to reflect actual operating conditions, the system achieves both measurement simplicity and precision without requiring complex sample transport infrastructure.
2Measurement precision
If traditional automatic measurement method based on rotational viscometer is used, then measurement precision is improved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical rotational viscometer system with a pressure-based flow measurement system. Instead of using rotating mechanical elements to measure viscosity, the system uses pressure sensors and flow rate measurements under controlled downhole conditions, eliminating complex mechanical components while maintaining measurement precision.
Solution Approach 2:
The system extracts only the essential measurement function from the complex rotational viscometer by using pressure and flow rate sensors to directly measure rheological parameters under simulated downhole conditions, removing unnecessary mechanical complexity while preserving measurement accuracy.
3Adaptability or versatility
If traditional automatic measurement method is used, then measurement capability is improved, but measurement time increases resulting in lower productivity
Solution Approach 1:
The system enables continuous measurement of rheological parameters by maintaining steady downhole simulation conditions and using automated data acquisition. The continuous flow through the simulation chamber allows for ongoing measurements without repeated setup, significantly improving measurement speed while maintaining comprehensive measurement capability.
Solution Approach 2:
The system performs preliminary conditioning of the drilling fluid by circulating it through the simulation chamber to reach thermal and pressure equilibrium before measurement begins. This preliminary action ensures that measurements start immediately under representative conditions, reducing total measurement time while maintaining measurement versatility.
4Device complexity
If simple measurement principle is used, then device complexity is reduced, but measurement precision deteriorates due to inability to account for thixotropy and actual downhole flow state
Solution Approach 1:
The simulation chamber serves multiple functions: it maintains downhole temperature and pressure, simulates actual downhole flow conditions through annular and conventional pipe sections, and enables rheological parameter measurement. This multi-functionality achieves precise measurements under realistic conditions without proportionally increasing device complexity.
Solution Approach 2:
The system dynamically adjusts flow rates and pressure conditions to simulate various downhole scenarios, including different annular flows and pipe flows. By making the measurement conditions dynamic rather than static, the system captures thixotropy effects and actual downhole flow behavior while maintaining a relatively simple measurement apparatus.
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
This system provides accurate rheological parameter measurements by simulating actual drilling conditions, enabling real-time monitoring and improving the reliability and applicability of drilling fluid assessments.
Implementation Method 1
The heat exchanger is located below the mud tank and the main function is to receive the test drilling fluid from the tank and heat it to simulate the practical conditions
Implementation Method 2
The heat jacket, which is arranged on the outer surface of the fluid tank and mainly used to keep the drilling fluid in the container warm by heating
Implementation Method 3
The plunger pump is used to pump the test drilling fluid to the flowing test device
Implementation Method 4
measure the pressure and flow rate of drilling fluid in the inlet and outlet of the test device
Data Source
AI summary
The disclosure relates to an automatic measuring system and a method thereof for drilling fluid parameters measurement. The system includes i. mud container, configured for test drilling fluid preparation and samples collection; ii. heat jacket, configured to keep the drilling fluid in the tank warm iii. heat exchanger, configured to simulate the practical conditions; iv. plunger pump, configured to pump the test drilling fluid to the flowing test device; v. flow test device, configured to simulate the flowing states of drilling fluid in the borehole annulus and drilling string, and also measure the pressure and flow rate of drilling fluid vi. control module, configured to obtain rheological parameters and the best rheological mode of the drilling fluid in the borehole annulus and drilling string based on the pressure and flow rate.