Wellbore Vent Sliding Sleeve Pressure Equalization
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Solution Overview
Problem
Conventional methods for setting straddle packers based on pressure differential in wellbore fracturing systems require reversing fluid flow to remove a column of fluid, which is time-consuming and can shut down the wellbore for an extended period.
Innovation Solution
A vent system positioned below a packer pair that utilizes a pressure differential to open and close, featuring a sliding sleeve, adjustable member, and piston to control fluid communication between the inner diameter and annulus, allowing for quicker pressure equalization and packer resetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to set straddle packers based on pressure differential, then the packers can be set to isolate the formation area, but the process requires reversing fluid flow to remove a column of fluid which takes a substantial amount of time and shuts down the wellbore for an extended period
Solution Approach 1:
The patent extracts the vent function from the conventional packer setting process by positioning a vent below the packer pair that can independently equalize pressure between the inner diameter and annulus. This separation allows the vent to handle the time-consuming pressure equalization task without delaying the packer setting operation, thereby reducing wellbore shutdown time while maintaining packer setting reliability.
Solution Approach 2:
The vent is pre-positioned below the packer pair in a ready state, capable of immediately equalizing pressure when needed. This preliminary positioning allows pressure equalization to occur before or during the packer setting process rather than requiring a separate subsequent step, thereby reducing the overall time loss associated with wellbore shutdown.
2Productivity
If a vent is positioned below the packer pair to enable pressure equalization, then the pressure differential can be established more quickly, but the vent must be controlled by a sliding sleeve that moves responsive to pressure differential changes
Solution Approach 1:
The sliding sleeve is designed to automatically move in response to pressure differential changes between the inner diameter and annulus. When pressure differential exceeds a threshold, the sleeve moves to close the vent; when pressure differential decreases, the sleeve returns to open the vent. This self-regulating mechanism eliminates the need for external control systems, thereby achieving fast pressure equalization without proportionally increasing device complexity.
Solution Approach 2:
The sliding sleeve control mechanism utilizes pressure differential (hydraulic principle) to automatically actuate the vent closure and opening. The pressure differential itself serves as the actuating force, eliminating the need for separate mechanical or electrical control systems. This hydraulic actuation achieves rapid response while keeping the control mechanism relatively simple.
3Stress or pressure
If the sliding sleeve moves to cover the vent when pressure differential is greater than a pressure threshold, then the vent closes to maintain pressure, but the sliding sleeve must return to uncover the vent when pressure differential is less than the pressure threshold
Solution Approach 1:
The sliding sleeve mechanism incorporates feedback based on pressure differential monitoring. When pressure differential exceeds the threshold, the sleeve moves to close the vent, maintaining pressure. When pressure differential decreases below the threshold, the sleeve returns to open the vent, allowing pressure equalization. This feedback loop ensures appropriate pressure maintenance while enabling the sleeve to return to its initial state, minimizing the duration of closed-position action.
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 efficient fracture creation and production by quickly equalizing pressures between the inner diameter and annulus, reducing downtime and enhancing the operational efficiency of wellbore fracturing systems.
Implementation Method 1
the adjustable member may compress when the pressure differential is greater than a spring force and the adjustable member may return to a resting, elongated state, when the pressure differential is less than the spring force
Implementation Method 2
The adjustable member may be a spring configured to compress and elongate based on the pressure differential between the inner diameter of the tool and the annulus between the packer pair
Implementation Method 3
The sliding sleeve may move towards the distal end of the tool responsive to a pressure differential between the inner diameter of the tool and the annulus between the straddle packer pair being greater than a pressure threshold
Implementation Method 4
The plurality of orifices may be configured to allow communication between an annulus positioned outside of the tool and the inner diameter of the tool
Data Source
AI summary
Systems and methods to maintain constant pressure within a chamber within a tool via a sliding seal, wherein the seal moves to increase or decrease the size of the chamber.