Single-Run Perforation and Fracturing Device with Sliding Sleeves
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Solution Overview
Problem
Current methods for multi-stage reservoir stimulation require repeated runs of the tubing string for perforating and fracturing, increasing operation procedures and costs while decreasing fracturing accuracy and precision.
Innovation Solution
A device for perforating, packing, and fracturing that allows the tubing string to be run only once, featuring a mechanism where the second inner sleeve exposes the nozzle under pressure to perform perforation and the first inner sleeve exposes the fracturing hole to enhance fracturing, thereby reducing operation procedures and costs while improving accuracy and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tubing string is run multiple times for perforating and sand fracturing, then the reservoir stimulation can be performed, but the operation procedures and operation costs are increased
Solution Approach 1:
The patent combines the perforating gun and packer with sliding sleeves into a single integrated device that can be run once. The device includes a packer with multiple sliding sleeves (first, second, third sliding sleeves) that control different flow channels, allowing perforating and fracturing operations to be performed in a single run rather than requiring separate runs for each operation.
Solution Approach 2:
The integrated device performs multiple functions: it can perform perforating through the nozzle and first fracturing hole, pack the annulus through the packer, and conduct fracturing through controlled flow channels. The sliding sleeves enable the device to switch between different operational modes (perforating, fracturing, packing) within a single run, making the device universal for multiple reservoir stimulation tasks.
2Reliability
If the tubing string is run multiple times for perforating and sand fracturing, then the reservoir stimulation can be performed, but the operation costs are increased
Solution Approach 1:
The patent combines the perforating gun and packer with sliding sleeves into a single integrated device that can be run once. The device includes a packer with multiple sliding sleeves (first, second, third sliding sleeves) that control different flow channels, allowing perforating and fracturing operations to be performed in a single run rather than requiring separate runs for each operation.
Solution Approach 2:
The device is prepared in advance with all necessary components (packer, sliding sleeves, nozzles, flow channels) configured to perform multiple operations. The sliding sleeves are positioned and sealed elements are pre-installed so that when the device is run, it can immediately perform perforating, packing, and fracturing operations without requiring intermediate interventions or additional runs, thereby reducing operational costs.
3Reliability
If the tubing string is run multiple times for perforating and sand fracturing, then the reservoir stimulation can be performed, but the fracturing accuracy and precision are decreased
Solution Approach 1:
The patent combines the perforating gun and packer with sliding sleeves into a single integrated device that can be run once. The device includes a packer with multiple sliding sleeves (first, second, third sliding sleeves) that control different flow channels, allowing perforating and fracturing operations to be performed in a single run rather than requiring separate runs for each operation.
Solution Approach 2:
The device incorporates pressure-sensitive mechanisms where the sliding sleeves respond to pressure differentials across the packer and within flow channels. When pressure reaches certain thresholds, the sliding sleeves automatically shift positions to open or close flow channels, providing feedback-controlled precision in determining when perforating and fracturing operations occur, thereby improving accuracy and precision.
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 device enables efficient reservoir perforation and fracturing with reduced operation costs and improved accuracy by allowing the tubing string to perform both functions in a single run, ensuring precise fracturing at the corresponding position.
Implementation Method 1
the rubber barrel assembly is configured to deform under an action of a fracturing fluid so that the packer is packed
Implementation Method 2
the second inner sleeve is configured to be movable relative to the nozzle sleeve to expose the nozzle under an action of a first pressure
Implementation Method 3
The first inner sleeve is configured to be movable relative to the upper connector to expose the fracturing hole under an action of a second pressure
Implementation Method 4
a nozzle for communicating inside and outside being provided at the nozzle sleeve
Implementation Method 5
a fracturing hole for communicating inside and outside being provided in an outer wall of the upper connector
Data Source
AI summary
A device for perforating, packing, and fracturing and a tubing string comprising the device are disclosed, wherein the device comprises an upper connector, a nozzle sleeve, a mandrel, a packer, a lower connector, a first inner sleeve provided inside the upper connector, and a second inner sleeve provided inside the nozzle sleeve, further wherein the upper connector is provided with a fracturing hole, and a nozzle is provided at the nozzle sleeve.