Downhole Fluid Separator in Multilateral Well Lateral
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Solution Overview
Problem
The increasing water cut in oil and gas wells reduces the economic viability of production, as the cost of disposing of produced water is high and environmentally unfriendly. Current methods for reducing water cut, such as downhole separation, are costly and complex, especially when integrating with multilateral well systems.
Innovation Solution
The installation of a fluid separator in a lateral bore of a multilateral well allows for efficient separation of produced water from hydrocarbons downhole, reducing the water cut and enabling the reinjection of separated water into the formation. This approach simplifies the installation process, reduces costs, and allows for the retrofitting of existing wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If downhole separation is implemented to reduce water cut, then the value of produced fluids increases and disposal costs decrease, but the installation cost and system complexity increase
Solution Approach 1:
The well system is divided into multiple segments including a main wellbore and one or more lateral wellbores. The fluid separator is specifically positioned in the lateral wellbore, separating the water separation function from the main production path. This segmentation allows the complex separation system to be installed in a less critical location while maintaining overall system functionality and reducing installation risk.
Solution Approach 2:
The lateral wellbore acts as an intermediary element between the main wellbore and the formation. By routing formation fluid through the lateral wellbore to the fluid separator, the system creates a dedicated pathway for water separation that doesn't interfere with the main production stream, simplifying the overall installation while achieving the water reduction goal.
2Productivity
If multilateral wells are used to increase productive zone intersection, then productivity increases, but the complexity of integrating downhole separation systems increases
Solution Approach 1:
The multilateral well system is segmented into a main wellbore for structural support and lateral wellbores for productive zone access. The fluid separator is assigned to the lateral wellbore, creating a functional segmentation that simplifies integration. Each lateral wellbore can be independently equipped with separation capabilities, allowing modular deployment that scales with productivity needs without proportionally increasing overall system complexity.
Solution Approach 2:
The lateral wellbore serves multiple functions: it provides additional productive zone intersection for increased oil production, acts as a conduit for formation fluid to the separator, and houses the fluid separator itself. This multi-functionality consolidates what would otherwise be separate systems into a unified approach, reducing integration complexity while maintaining high productivity.
3Device complexity
If fluid separator is installed in lateral bore instead of above multilateral junction, then installation cost and complexity are reduced, but the position constraints increase
Solution Approach 1:
Instead of placing the fluid separator in the conventional location above the multilateral junction in the main wellbore, the invention inverts the approach by positioning the separator in the lateral wellbore. This inversion reduces installation complexity and cost by avoiding work in the more constrained and expensive main wellbore environment, while still achieving effective water separation through the lateral flow path.
Solution Approach 2:
The lateral wellbore effectively becomes a copy or alternative pathway to the formation, parallel to the main wellbore's function. By utilizing this copied pathway for the fluid separator installation, the system achieves the separation function with reduced complexity while the main wellbore retains its primary structural and production role, maintaining overall system versatility.
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 solution effectively reduces the water cut in oil and gas wells, increasing the value of produced fluids and decreasing disposal costs. It also enables the conversion of poor-producing wells into downhole water injectors, enhancing overall well productivity and reducing environmental impact.
Implementation Method 1
a fluid separator disposed within a lateral bore of a multilateral well to receive formation fluid from a main bore of the multilateral well and separate the formation fluid into formation water and production fluid
Data Source
AI summary
A system may include a fluid separator disposed within a lateral bore of a multilateral well. The fluid separator may be configured to receive formation fluid from a main bore of the multilateral well, separate the formation fluid into formation water and production fluid, and output the production fluid to flow uphole. The system may also include a lower lateral packer, disposed within the lateral bore in a position downhole from the fluid separator, and a downhole pump disposed in the lateral bore. The downhole pump is configured to receive the formation water from the fluid separator and pump the formation water to flow into a portion of the lateral bore downhole from the lower lateral packer.