Downhole Fluid Separator Using Artificial Gravity
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Solution Overview
Problem
The increasing water cut in oil and gas wells reduces the economic viability of well operations, as the cost of disposing of produced water becomes significant, and existing methods for reducing water cut, such as downhole separation, are costly and complex.
Innovation Solution
The implementation of a multilateral well completion design that includes a fluid separator installed inside or below the junction between the main bore and the lateral well, utilizing artificial gravity generators to separate oil from water, and incorporating pumps and check valves to facilitate efficient separation and disposal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downhole fluid separation is implemented to reduce water cut, then the economic value of produced fluids increases, but the cost and complexity of installation increases
Solution Approach 1:
The separation system is divided into multiple independent fluid separator assemblies, each capable of operating autonomously. The system segments the separation function across multiple units rather than requiring a single complex centralized system, allowing modular installation and maintenance while achieving overall water cut reduction goals
Solution Approach 2:
The fluid separator assemblies utilize dynamic centrifugal separation mechanisms that adapt to varying flow conditions. The rotating separator components automatically adjust separation efficiency based on fluid velocity and density differences, maintaining effective water-oil separation across different production rates without requiring complex control systems
2Productivity
If multilateral well completion is used to increase productive zone intersection, then well productivity increases, but the complexity of well architecture increases
Solution Approach 1:
The fluid separator assemblies are designed with multi-functionality to operate effectively in various well configurations including vertical, horizontal, and multilateral completions. The same separator design can be deployed in different well architectures, reducing the need for specialized equipment for each configuration and simplifying overall system complexity
Solution Approach 2:
The fluid separator assemblies are compactly designed to be nested within the existing wellbore structure and completion string. The separators integrate within the tubular architecture without requiring additional surface infrastructure, allowing multilateral well complexity to be managed while maintaining productivity benefits
3Ease of manufacture
If produced water is disposed at surface, then separation can be performed, but energy consumption and disposal costs increase
Solution Approach 1:
The fluid separator assemblies perform self-service separation downhole using passive centrifugal forces generated by fluid flow through the separator. The system utilizes the kinetic energy already present in the flowing production fluids to drive separation, eliminating the need for external power sources or active pumping for the separation function itself
Solution Approach 2:
The system replaces energy-intensive mechanical separation systems (such as powered centrifuges or filtration systems requiring electricity) with passive mechanical separation based on density differentiation and centrifugal forces. This substitution eliminates complex power requirements while maintaining effective water-oil separation
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 approach reduces the overall cost and complexity of installing downhole fluid separators, allows for the conversion of poor-producing wells into downhole water injectors, and enhances oil recovery by reducing water cut, thereby increasing the economic value of well operations.
Implementation Method 1
a turbine disposed within the turbine chamber, wherein the turbine is configured to rotate to generate artificial gravity
Implementation Method 2
the artificial gravity is configured to separate the formation fluid into formation oil and formation water
Data Source
AI summary
A fluid separator system may include a separator housing, a turbine chamber formed within the separator housing, and a fluid inlet configured to receive formation fluid and direct the formation fluid into the turbine chamber. The formation fluid may include oil and water. The fluid separator system may also include a turbine disposed within the turbine chamber and configured to rotate to at least partially separate the formation fluid into formation oil and formation water. Additionally, the fluid separator system may include an oil outlet configured to receive the formation oil separated from the formation fluid and direct the formation oil toward an upper production tubing and a water outlet configured to receive the formation water separated from the formation fluid and direct the formation water out of the separator housing.