Rigless Hydraulic Fracturing Isolation Assembly
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Solution Overview
Problem
Current wellbore stimulation methods for hydraulic fracturing in tight formations require mechanical packers that are time-consuming to install and remove, necessitating the use of drilling rigs, which is inefficient and costly.
Innovation Solution
A rigless fracturing assembly using coiled tubing with uphole and downhole isolating assemblies that are hydraulically engaged to isolate zones within the wellbore, allowing for hydraulic fracturing in a single trip without the need for drilling rigs, utilizing the same fluid for engagement and fracturing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical packers are used for zonal isolation in hydraulic fracturing, then reliable zone isolation is achieved, but installation time and operational complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical packer system with a hydraulic isolation system. Instead of using mechanical expansion forces to set packers, the invention uses hydraulic pressure differentials created by the fracturing fluid itself to engage isolating assemblies. This substitution eliminates the need for mechanical setting operations and reduces installation time while maintaining isolation reliability.
Solution Approach 2:
The invention employs hydraulic principles to achieve zonal isolation. The fracturing fluid creates pressure differentials that force isolating assemblies against sealing surfaces, establishing isolation zones. This hydraulic mechanism is integrated into the fracturing process itself, eliminating separate mechanical packing operations and reducing overall operational time.
2Reliability
If mechanical packers are installed with drilling rigs, then effective wellbore isolation is achieved, but operational cost and equipment requirements increase
Solution Approach 1:
The fracturing fluid serves multiple functions: it acts as both the fracturing medium and the isolation mechanism. The same fluid that creates fractures also generates the pressure differentials needed to engage isolating assemblies. This multi-functionality eliminates the need for separate mechanical packer systems and drilling rig equipment, reducing overall device complexity while maintaining isolation effectiveness.
Solution Approach 2:
The fracturing fluid performs dual duties by simultaneously creating fractures and establishing zonal isolation through pressure differentials. The system uses its own operational characteristics (pressure gradients) to achieve isolation without requiring external mechanical intervention or additional equipment, thereby simplifying the overall system.
3Productivity
If hydraulic fracturing is performed in multiple zones, then production enhancement is improved, but operational time and cost increase with mechanical packer reinstallation
Solution Approach 1:
The isolating assemblies are designed to be dynamically engaged and disengaged through hydraulic pressure control. By adjusting pressure differentials, the system can selectively isolate different zones without requiring physical repositioning or reinstallation of mechanical components. This dynamic control enables efficient multi-zone fracturing operations, improving productivity while reducing the time lost between zones.
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 and cost-effective hydraulic fracturing by eliminating the need for drilling rigs, reducing operational time and enhancing the ability to isolate and fracture targeted zones within the wellbore without the constraints of mechanical packers.
Implementation Method 1
The downhole piston assembly is in fluid communication with the central bore of the tool body. The downhole piston assembly is moveable between a downhole piston contracted position and a downhole piston extended position. The downhole piston assembly is operable to move the downhole isolating assembly between the downhole unengaged position and the downhole engaged position.
Implementation Method 2
The uphole piston assembly is moveable between an uphole piston contracted position and an uphole piston extended position. The uphole piston assembly is in fluid communication with the central bore of the tool body when the downhole piston assembly is in the downhole piston extended position. The uphole piston assembly is operable to move the uphole isolating assembly between the uphole unengaged position and the uphole engaged position.
Implementation Method 3
The fracturing assembly has as uphole and downhole isolating assemblies that are engaged hydraulically to isolate a zone of the wellbore for hydraulic fracturing purposes.
Data Source
AI summary
Systems and methods for hydraulically fracturing a subterranean formation include a fracturing assembly with a tool body having a central bore. A downhole isolating assembly is moveable between a downhole unengaged position and a downhole engaged position. A downhole piston assembly is moveable between a downhole piston contracted position and a downhole piston extended position and is operable to move the downhole isolating assembly between the downhole unengaged position and the downhole engaged position. An uphole isolating assembly is moveable between an uphole unengaged position and an uphole engaged position. An uphole piston assembly is moveable between an uphole piston contracted position and an uphole piston extended position, where the uphole piston assembly is operable to move the uphole isolating assembly between the uphole unengaged position and the uphole engaged position.