Downhole Fluid Sampling Circulation Loop
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Solution Overview
Problem
Traditional reservoir fluid analysis methods require capturing samples at downhole or surface conditions and then measuring properties in a laboratory, which can be time-consuming and may not accurately represent in-situ conditions due to contamination and fluid changes during drilling.
Innovation Solution
A downhole tool with a circulation flow loop captures clean reservoir fluid for subsequent analysis using an In-situ Fluid Analyzer (IFA) module, which includes optical sensors and pressure/temperature sensors to measure fluid density and compressibility, ensuring accurate and contamination-free data through a controlled fluid sampling and analysis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laboratory analysis methods are used, then fluid samples can be obtained, but the samples may be contaminated and do not accurately represent in-situ conditions
Solution Approach 1:
The patent performs preliminary actions by establishing a clean circulation flow loop before sampling, circulating clean fluid through the system to displace contaminated fluid, and preparing the sampling environment in advance to prevent contamination during the actual sampling process
Solution Approach 2:
The patent introduces a clean fluid intermediary substance to displace and replace contaminated reservoir fluid in the circulation loop. This clean fluid acts as a mediator that carries the reservoir fluid properties to the measurement chamber without introducing contamination from the sampling system
2Reliability
If downhole sampling is performed, then in-situ fluid can be captured, but the process is time-consuming and complex
Solution Approach 1:
The patent merges the sampling function and analysis function into a single integrated downhole tool. The circulation flow loop, measurement chamber, and optical sensors are combined in one device, allowing simultaneous sampling and measurement without requiring separate laboratory analysis steps
Solution Approach 2:
The patent replaces complex mechanical sampling and transportation systems with an optical measurement system. Instead of physically transporting samples to the surface for analysis, optical sensors directly measure fluid properties in-situ, substituting mechanical sample handling with non-contact optical detection
3Adaptability or versatility
If fluid is transported to surface laboratory, then comprehensive analysis can be performed, but fluid properties change during transport
Solution Approach 1:
The patent creates a simplified measurement chamber that copies the essential measurement functions of a laboratory without requiring full laboratory capabilities. Optical sensors measure key fluid properties directly in the downhole environment, creating a virtual replica of laboratory analysis conditions without the need for physical sample transport
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
Enables real-time, accurate measurement of fluid properties like density and compressibility directly from the reservoir, reducing contamination risks and improving the reliability of reservoir management decisions by providing in-situ data.
Implementation Method 1
an In-situ Fluid Analyzer (IFA) module, which includes optical sensors and pressure/temperature sensors to measure fluid density and compressibility
Data Source
AI summary
A system and method for obtaining a clean fluid sample for analysis in a downhole tool are provided. In one example, the method includes directing fluid from a main flowline of the downhole tool to a secondary flowline of the downhole tool. While the fluid is being directed into the secondary flowline, sensor responses corresponding to the fluid in the secondary flowline are monitored to determine when the sensor responses stabilize. The secondary flowline is isolated from the main flowline after the sensor responses have stabilized. A quality control procedure is performed on the fluid in the secondary flowline to determine whether the captured fluid is the same as the fluid in the main flowline. Additional fluid from the main flowline is allowed into the secondary flowline if the captured fluid is not the same.