Injection Sleeve Variable Orifice Valve Seal Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current injection sleeves for oil/gas wells are unreliable due to ball dropping mechanisms and require long, costly hydraulically actuated control lines, leading to permanent open positions and seal damage from high pressures.
Innovation Solution
A tubing retrievable injection sleeve with a large piston and variable orifice insert valve that initially prevents fluid flow at a low pressure, opening only at a higher pressure to allow full flow, using magnets and springs to maintain seal integrity and prevent chatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ball dropping mechanism is used to actuate injection sleeve, then sleeve can be opened, but the mechanism is unreliable and results in permanently open outlets
Solution Approach 1:
The patent replaces the mechanical ball dropping mechanism with a pressure-actuated system using a piston and variable orifice valve. Fluid pressure directly moves the piston to open/close the injection sleeve outlets, eliminating the unreliable mechanical ball mechanism while maintaining controllable operation through pressure regulation.
Solution Approach 2:
The injection sleeve system uses the injected fluid's own pressure to actuate the piston and control the outlets. The system serves itself by using the process fluid to control the injection process, eliminating the need for external ball dropping mechanisms or complex control systems.
2Ease of operation
If hydraulically actuated injection sleeves are used, then sleeve opening can be controlled, but extremely long control lines up to two miles are required which is costly and may fail
Solution Approach 1:
The patent extracts and eliminates the need for long external control lines by incorporating the actuation mechanism directly at the injection sleeve location. The piston and valve assembly is integrated into the sleeve itself, allowing local control without requiring miles of hydraulic control lines from the surface.
Solution Approach 2:
The patent uses fluid pressure as an intermediary to transmit the opening/closing command from the injection fluid flow to the sleeve outlets. Instead of using long mechanical or hydraulic control lines, the injected fluid itself serves as the intermediary medium to actuate the piston and control the outlets.
3Productivity
If injection outlets are in permanently open position, then fluid can flow freely, but packing around ports must open under pressure which damages seals over time
Solution Approach 1:
The patent makes the injection outlets dynamically controllable rather than permanently open. The piston and variable orifice valve system allows the outlets to open and close based on fluid pressure conditions, enabling the seals to remain in their natural closed position when not in use, thereby preventing pressure-induced seal damage and extending seal life.
4Productivity
If variable orifice insert valve opens at higher pressure, then full flow is permitted, but initially prevents flow at low pressure requiring pressure increase
Solution Approach 1:
The patent uses parameter changes in the variable orifice valve to control flow. The valve transitions from a closed state at low pressure to an open state at higher pressure, allowing the system to regulate fluid flow rate by changing the pressure parameter. This enables controlled injection rates while preventing uncontrolled flow at low pressures.
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 design increases tool longevity, prevents seal damage, and eliminates chatter, while allowing sequential zone treatment and preventing backflow, with the ability to selectively control injection into multiple zones.
Implementation Method 1
an enlarged annular piston positioned on the flow tube and having opposite sides exposed to opposite sides of the pressure differential so as to move the flow tube axially in response to the pressure differential
Implementation Method 2
A variable orifice insert valve located within the sleeve initially prevents fluid flow through the sleeve at a first given pressure but will open at a given second level of fluid pressure to allow flow through the sleeve
Implementation Method 3
The variable orifice valve includes a pair of oppositely polarized magnets which together with the bi-directionality of the large annular piston seals prevent any lower well pressure from reaching the surface
Data Source
AI summary
An injection sleeve and apparatus for injecting fluid into a well includes a flow tube having a piston which upon fluid flow opens one or more outlet ports. The injection sleeve is adapted to include a variable orifice insert which prevents flow through the tool at a first selected pressure level until the outlet ports are in an open position, thereby protecting packing seals on either side of the outlet ports from undue wear and tear, and prolonging the life of the tool. At a second pressure level, the variable orifice insert permits flow through injection sleeve to the formation injection zones. A plurality of the sleeves may be used for sequentially injecting fluid into a plurality of injection formation zones surrounding a well. When injection fluid flow is terminated, the injection sleeves act as a dual barrier valve for preventing flow from the injection formation zones back to the well head.