Downhole Gravity Water Separator for Subsea Well Completion
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Solution Overview
Problem
Current subsea well operations face challenges in increasing reservoir recovery factor due to water breakthrough, which requires efficient water separation from produced hydrocarbons to reduce back pressure and frictional effects in pipelines, while also simplifying system installation and reducing costs.
Innovation Solution
A gravity water separation system integrated within the well completion, utilizing a diverted flowpath with gravity separation stages and an operable full bore isolation valve for flow diversion, allowing for early field production and seamless operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water separation is implemented in subsea well operations, then reservoir recovery factor increases and back pressure reduces, but system complexity and installation difficulty increase
Solution Approach 1:
The patent combines the water separator with the well completion system by integrating it into the production tubing assembly. The separator becomes part of the existing well architecture rather than a separate downstream facility, merging multiple functions (production, separation, and chemical injection elimination) into a unified system that reduces overall complexity despite adding separation capability.
Solution Approach 2:
The invention transitions water separation from a surface-level or downstream process to a downhole operation within the wellbore. By implementing separation at the production source rather than at surface facilities, the system achieves separation functionality without requiring complex surface infrastructure, effectively moving the separation function to a different spatial dimension (downhole vs. surface).
2Productivity
If a water separator is installed in the production flowline, then water removal efficiency improves, but flow disruption and production downtime increase
Solution Approach 1:
The system performs water separation at the earliest possible point in the production flow, right at the wellhead. This preliminary action removes water before it can cause downstream issues such as hydrate formation or pipeline blockages, ensuring continuous efficient production without interruptions later in the flowline.
Solution Approach 2:
The full bore isolation valve serves as an intermediary component that enables or disables the separator's operation without interrupting production. When the separator requires maintenance or is bypassed, the valve allows production to continue through the well completion system, acting as a mediator between the separator and the production flow to maintain reliability.
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 enhances reservoir recovery by integrating water separation within the well completion, reducing pipeline costs, eliminating chemical injection needs, and providing continuous production without system disruption, thus optimizing field life and reducing operational expenses.
Implementation Method 1
As produced hydrocarbons travel through the diverted flowpath, they pass through separation stages wherein gravity separation ensues by migration through predefined flow ports which extend from produced oil separation chambers into separated water chambers
Implementation Method 2
gravity separation ensues by migration through predefined flow ports which extend from produced oil separation chambers into separated water chambers
Data Source
AI summary
A gravity water separation system that may be integrated within a well completion. A diverted flowpath is provided for produced hydrocarbons, external to the completion tubing. As produced hydrocarbons travel through the diverted flowpath, they pass through separation stages wherein gravity separation ensues by migration through predefined flow ports which extend from produced oil “separation chamber(s)” into separated “water chamber(s).”