Sleeve Valve Selective Injection Wellbore
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Solution Overview
Problem
Conventional hydrocarbon well stimulation methods, such as hydraulic fracturing, require the removal of production packers to access different zones, and existing sleeve valves do not allow for varied injection profiles, limiting optimization of production across multiple zones within a wellbore.
Innovation Solution
An apparatus with an elongate inner casing and outer casing forming an annular cavity, featuring sleeve valves and nozzles that enable selective flow paths with different flow rates, allowing for the selective injection of materials into a wellbore, and a method to position and open/close these passages to control fluid flow and stimulation across various zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fracing systems use production packers to isolate zones, then zone isolation is achieved, but the packers must be removed to access zones beyond them
Solution Approach 1:
The system divides the wellbore into multiple independently controllable zones using separate sleeve valves at different depths. Each sleeve can be opened or closed independently, allowing selective access to specific zones without affecting others, eliminating the need to remove packers to access deeper zones.
Solution Approach 2:
The sleeve valves are designed to be dynamically openable and closable on demand. This dynamic control allows the system to switch between isolating and accessing zones as needed, providing flexibility that static packer systems cannot achieve.
2Ease of operation
If existing sleeve valves are used to eliminate production packers, then the necessity of packers is eliminated, but a variety of injection profiles are not permitted
Solution Approach 1:
The system incorporates nozzles with different flow rate characteristics at different locations within the annular cavity. Each nozzle can be configured with specific flow rates to create varied injection profiles tailored to specific zones, allowing localized optimization of injection parameters.
Solution Approach 2:
The sleeve valve system is designed to perform multiple functions: it can isolate zones, enable hydraulic fracturing, allow fluid injection for pressure maintenance, and provide varied injection profiles all through a single integrated system, replacing the need for multiple specialized tools.
3Productivity
If multiple zones are to be stimulated with different flow rates, then production optimization is achieved, but conventional systems cannot provide varied injection profiles across zones
Solution Approach 1:
Different nozzles positioned at different locations in the annular cavity are configured with varying flow rate characteristics. This allows each zone receiving injection to have optimized flow rates tailored to its specific production needs, enabling production optimization across multiple zones simultaneously.
Solution Approach 2:
The injection system is segmented into multiple independent flow paths, each controllable through individual sleeve valves and equipped with nozzles of different flow rate characteristics, allowing customized injection profiles for each zone to maximize overall production.
Data Source
AI summary
An apparatus for selectably injecting materials into a well comprises an elongate inner casing having first and second sets of selectably closable passages therethrough and an outer casing extending between the first and second ends surrounding the inner casing so as to form an annular cavity therebetween. The first end of the outer casing is sealably connected to the inner casing and the second end of the outer casing has a free edge proximate to the second set of passages. The first set of passages extends through the inner casing into the annular cavity such that fluid passing through either of the first or second sets of passages enters an exterior of the apparatus at a common location.