Downhole Gas Separation Membrane for In Situ Fluid Analysis
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Solution Overview
Problem
Current methods for analyzing borehole fluids are impractical due to size limitations, extreme conditions, and changes in fluid characteristics when brought to the surface, particularly challenging for detecting gaseous compounds like CO2, H2S, and CH4, which are crucial for hydrocarbon reservoir viability and equipment integrity.
Innovation Solution
An in situ gas separation and detection system using a membrane with integrated layers for strength and a test chamber for spectroscopy, allowing for real-time analysis of gases within the borehole, protected from pressure differentials and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluid samples are retrieved for laboratory analysis, then analysis can be performed with available equipment, but the process is time consuming and fluid characteristics change due to environmental differences between borehole and surface
Solution Approach 1:
The system performs fluid analysis in situ within the borehole before the fluid can be retrieved to the surface. The membrane separation module and detection system are deployed downhole to immediately analyze gas compounds in the borehole environment, eliminating time loss during retrieval and preventing changes that occur during transport to the surface laboratory.
2Measurement precision
If fluid samples are retrieved using metallic containers, then sampling can be performed, but hydrogen sulfide gas forms non-volatile metal sulfides resulting in inaccurate sulfide content estimates
Solution Approach 1:
The system uses a membrane separation module as an intermediary barrier between the borehole fluid and the detection system. The membrane selectively separates gas compounds from the fluid without allowing direct contact between hydrogen sulfide and metallic surfaces, preventing sulfide formation while enabling accurate detection of gas composition in the borehole environment.
3Ease of operation
If known fluid analysis techniques are used in the borehole environment, then in situ analysis is possible, but the techniques are impractical due to size limitations, extreme temperature, extreme pressure, and presence of water
Solution Approach 1:
The system employs a membrane separation module with specific local properties suited for downhole conditions. The membrane structure and composition are designed to function effectively under extreme temperature and pressure while maintaining selective gas separation capability. The integrated detection system uses sensors optimized for detecting gas compounds in the borehole environment without requiring complex surface-based equipment.
4Ease of operation
If gas is separated from borehole fluid using a membrane, then in situ detection is enabled, but the gas separation system must be protected from damage due to pressure differential
Solution Approach 1:
The membrane separation module is constructed as a composite structure integrating multiple layers with different functions. The composite design includes an inorganic base layer providing mechanical strength and pressure resistance, a gas selective layer enabling gas separation, and a water impermeable layer preventing water penetration. This multi-layer composite structure protects the gas separation function while maintaining reliability under extreme downhole pressure differentials.
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 accurate and timely analysis of borehole fluids, reducing errors caused by surface conditions and eliminating the need for sample retrieval, thereby improving the assessment of hydrocarbon reservoir viability and equipment reliability.
Implementation Method 1
The gas separation system may include a membrane
Implementation Method 2
The integrated separation membrane may include one or more of a water impermeable layer, gas selective layer, inorganic base layer and metal support layer
Implementation Method 3
When spectroscopy is employed, a test chamber is used to hold the gas undergoing test
Data Source
AI summary
A gas separation and detection tool for performing in situ analysis of borehole fluid is described. The tool comprises a sampling chamber for a downhole fluid. The sample chamber comprises a detector cell with an opening. The tool also comprises a gas separation module for taking a gas from the downhole fluid. The gas separation module comprises a membrane located in the opening, a support for holding the membrane, and a sealant applied between the housing and the membrane or support. Moreover, the tool comprises a gas detector for sensing the gas.