Powered Downhole Separator Orientation for Water Cut Reduction
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Solution Overview
Problem
Oil and gas wells produce significant amounts of water, leading to increased operating costs and environmental challenges due to the need for water disposal, which often determines the end of a well's productive life. Existing methods of separating water from hydrocarbons at the surface are inefficient and costly, while multilateral wells offer limited solutions for enhancing production and disposal.
Innovation Solution
Implementing Downhole Oil-Water Separation (DOWS) systems that include powered orientation devices to optimize the orientation of separators and injectors within multilateral wells, allowing for efficient separation and disposal of water and solids downhole, reducing the water cut and increasing the value of produced fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface separation methods are used to separate water from hydrocarbons, then separation can be performed, but operating costs increase and environmental challenges arise due to water disposal requirements
Solution Approach 1:
The patent inverts the conventional separation approach by moving the separation process from the surface to the downhole environment. Instead of bringing all produced fluids to the surface for separation, the system separates water and hydrocarbons in situ downhole, with water being reinjected and only hydrocarbons returned to the surface. This inversion eliminates the need for surface water handling facilities and reduces operating costs.
Solution Approach 2:
The patent introduces a new dimensional aspect to the separation process by utilizing the vertical dimension of the wellbore for separation and the lateral dimension through multilateral wells for water disposal. The system employs multiple laterals at different orientations to reinject separated water into appropriate formation zones, adding spatial complexity that resolves the contradiction between effective separation and efficient water disposal.
2Productivity
If multilateral wells are used to increase productive zone intersection, then productivity increases, but water disposal challenges persist
Solution Approach 1:
The patent makes the well structure multi-functional by using multilateral wells for dual purposes: production of hydrocarbons through the main wellbore and disposal of separated water through lateral injectors. The same well infrastructure serves both production and injection functions, eliminating the need for separate disposal wells and reducing overall device complexity despite the increased productivity requirements.
3Productivity
If downhole separation is implemented, then water cut decreases and disposal costs reduce, but device complexity increases
Solution Approach 1:
The downhole separation system is designed to be self-service by utilizing the natural density difference between water and hydrocarbons to achieve separation without complex mechanical separators. The system employs simple gravity-based separation mechanisms and uses the produced water pressure itself to drive reinjection through the lateral injectors, eliminating the need for external power sources or complex pumping systems downhole.
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
The DOWS systems enhance the productivity of wells by decreasing the water cut, reducing disposal costs, and enabling efficient disposal of separated water, thereby increasing the economic viability and environmental sustainability of oil and gas production.
Implementation Method 1
determining an orientation of the downhole separator with respect to gravity; and reorienting the downhole separator to a predetermined orientation
Data Source
AI summary
In some implementations, a downhole oil-water separation (DOWS) assembly may be configured to be disposed downhole in a well. The DOWS assembly may include a DOWS device configured to operate on fluids in the DOWS assembly. The DOWS assembly also may include a controller configured to determine an orientation of the DOWS device and to cause a change to the orientation of the DOWS device.