Downhole Placement Tool Fluid Actuator Door Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wellbore technologies lack effective and efficient methods for placing materials within wellbores, particularly for sealing and isolation purposes, especially in environments with geologic shifting and pressure issues.
Innovation Solution
A downhole placement tool with an actuation assembly and a placement assembly that uses fluid pressure to release wellbore materials, such as bentonite, into the wellbore, allowing for controlled and selective placement and sealing, including features like ball actuators, electro-hydraulic systems, and filtration subs to manage fluid flow and material release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cementing tools are used to place materials in the wellbore, then the wellbore can be sealed, but the placement precision and control are insufficient to address geologic shifting and pressure issues
Solution Approach 1:
The placement tool incorporates a movable door mechanism that can be dynamically opened or closed based on downhole conditions. The door is actuated by a fluid pressure system that responds to geologic shifting and pressure changes, allowing the tool to adapt its sealing behavior in real-time rather than being static. This dynamic response enables precise material placement while maintaining reliability under changing geological conditions.
Solution Approach 2:
The system employs a feedback mechanism where fluid pressure sensors detect downhole conditions and automatically trigger door opening/closing actions. When geologic shifting or pressure changes are detected, the feedback system activates the actuation mechanism to adjust the door position, ensuring precise material placement and maintaining sealing reliability without requiring manual intervention.
2Productivity
If plugs are inserted into perforations to seal the wellbore, then fluid passage is blocked, but the method lacks efficiency and control for selective material placement
Solution Approach 1:
The invention extracts the sealing function from permanent plugs and implements it through a temporary, controllable door mechanism. The door can be opened to allow material placement and then closed to create the seal, eliminating the need for separate plug insertion operations. This integration improves productivity by combining multiple functions into one tool while enhancing ease of operation through centralized control from the surface.
Solution Approach 2:
The placement tool serves multiple functions: it transports wellbore material, controls material release timing, creates the seal, and can be actuated from the surface. This multi-functionality improves productivity by eliminating the need for separate tools for material placement and sealing, while the unified control system enhances ease of operation compared to multiple separate operations.
3Ease of operation
If a door mechanism is used to control material release, then selective placement is improved, but the device complexity increases
Solution Approach 1:
The door actuation system uses hydraulic or pneumatic pressure transmitted through fluid conduits from the surface to downhole. This approach simplifies the downhole mechanism by using fluid pressure instead of complex mechanical linkages or electronic systems. The door is connected to a piston or diaphragm that converts fluid pressure into mechanical motion, providing selective control while minimizing device complexity at the downhole location.
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
Enables precise and efficient placement of wellbore materials for sealing and isolation, addressing issues like geologic shifting and pressure migration, providing a flexible and long-lasting barrier to prevent gas migration and fracturing.
Implementation Method 1
The actuation piston is movable by fluid applied thereto to open the fluid pathway and allow the fluid to pass through the fluid pathway
Implementation Method 2
The piston head is movable in response to flow of the fluid from the actuation assembly into the placement assembly to advance the placement piston and open the door
Data Source
AI summary
A downhole placement tool includes an actuation (122) and a placement assembly. The actuation assembly includes a housing (226a) having a fluid pathway therethrough and an actuation piston seated in the housing to block the fluid pathway. The actuation piston is movable by fluid applied thereto to open the fluid pathway and allow the fluid to pass therethrough. The placement assembly is connected to the actuation assembly (122), and includes a housing (226b) having a pressure chamber (217b) to store the wellbore material (103) therein, a door (219), and a placement piston. The placement piston includes a piston head (264a) slidably movable in the housing, and a rod (264b) connected between the piston head (264a) and to the door (219). The piston head (264a) is movable in response to the flow of the fluid from the actuation assembly (122) into the placement assembly to advance the placement piston and open the door (219) whereby the wellbore material (103) is selectively released into the wellbore.