Interruptible Pressure Testing Valve for Wellbore Casing Integrity
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Solution Overview
Problem
Conventional pressure testing methods for wellbore casing strings require excessive pressure thresholds to open fluid pathways, risking the structural integrity of the casing and stimulation equipment, and do not allow for suspended or resumed pressure testing.
Innovation Solution
An interruptible pressure testing valve (IPTV) is integrated within the casing string, featuring a sliding sleeve and collar with a check valve, allowing fluid communication only after a predetermined pressure is maintained for a minimum of one minute, enabling safe pressure testing and subsequent fluid communication without exceeding standard pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure testing methods use excessive pressure thresholds to open fluid pathways, then fluid communication is achieved, but the structural integrity of the casing and stimulation equipment is compromised
Solution Approach 1:
The valve body is divided into separate chambers (first chamber and second chamber) that are not fluidically exposed to each other or to the axial flowbore. This segmentation allows independent pressure control in each chamber, enabling the sliding sleeve to be actuated at a lower, equipment-safe pressure threshold while maintaining the ability to achieve fluid communication when needed.
Solution Approach 2:
The sliding sleeve acts as an intermediary component that translates pressure applied to the axial flowbore into mechanical movement. When pressure is applied, the sliding sleeve moves to open or close ports, providing fluid communication without requiring the excessive pressure thresholds that would otherwise be needed to directly force open conventional valves.
2Ease of operation
If conventional valves open upon exceeding pressure levels, then fluid communication is provided, but the pressure levels required jeopardize structural integrity
Solution Approach 1:
The sliding sleeve is designed to dynamically respond to pressure changes by moving between positions. When pressure is applied to the axial flowbore, the sliding sleeve moves to open ports and provide fluid communication. This dynamic mechanism allows easy operation for achieving fluid communication while operating within safe pressure limits that preserve casing string integrity.
3Reliability
If pressure testing requires maintaining pressure for sufficient time to ensure integrity, then leak detection is achieved, but the testing cannot be suspended or resumed
Solution Approach 1:
The fluid delay system pre-charges the first chamber with fluid at a controlled rate, creating a time delay before the sliding sleeve actuates. This preliminary action allows the pressure testing process to be paused and resumed as needed, since the system maintains its state without requiring continuous pressure application, thereby providing both reliability verification and testing flexibility.
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 IPTV allows for safe and efficient pressure testing of wellbore casing strings, enabling suspended or resumed testing and fluid communication without exceeding standard pressure thresholds, thereby protecting equipment integrity and facilitating formation stimulation operations.
Implementation Method 1
when a predetermined pressure is applied to the axial flowbore for a predetermined duration of at least one minute
Implementation Method 2
the collar comprises a check valve, wherein the check valve is configured to control fluid communication from the first chamber portion to the second chamber portion over at least the first portion of the sliding sleeve stroke
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A wellbore servicing system comprising a pressure testing valve incorporated within a casing string and comprising a housing comprising one or more ports and an axial flowbore, a sliding sleeve, wherein the sliding sleeve is positioned within the housing and transitional from a first position to a second position through a sliding sleeve stroke, wherein, in the first position, the sliding sleeve blocks a route of fluid communication via the one or more ports and, in the second position the sliding sleeve does not block the route of fluid communication via the one or more ports, wherein the pressure testing valve is configured such that application of a predetermined pressure to the axial flowbore for a predetermined duration causes the sliding sleeve to transition from the first position to the second position, wherein the predetermined duration is at least about one minute.