Swellable Packer Perforating Assembly Single Trip Isolation
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Solution Overview
Problem
Current methods for perforating and isolating zones in a subterranean well require multiple trips and allow cross-flow between existing and new perforations, leading to potential environmental hazards and resource waste.
Innovation Solution
A perforating and isolating apparatus using swellable seal material packers and attached perforating assemblies that allow for isolating existing perforations and forming new ones in a single trip, preventing cross-flow by swelling the seal material with well fluid before actuating the perforating assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If straddle packers are conveyed into the well and set after perforating debris has been introduced into the well, then the originally perforated zones can be isolated, but multiple trips into the well are required and cross-flow may occur between perforated zones
Solution Approach 1:
The patent combines the packer and perforating gun into a single integrated device, allowing both isolation and perforation operations to be performed simultaneously in one trip into the well. This eliminates the need for separate operations and prevents cross-flow between zones during the process.
Solution Approach 2:
The packer is positioned and set before the perforating gun is fired, creating the isolation barrier in advance. This preliminary action ensures that no cross-flow can occur during the subsequent perforation operation, while still allowing both functions to be accomplished in a single trip.
2Reliability
If conventional mechanical packers are used, then isolation can be achieved, but complex mechanical packer setting mechanisms are required
Solution Approach 1:
The patent replaces complex mechanical packer setting mechanisms with a chemically-actuated swelling system. The packer element is made of swellable material that automatically expands when exposed to well fluids, eliminating the need for mechanical actuators, hydraulic systems, or complex setting mechanisms while achieving reliable isolation.
Solution Approach 2:
The swellable packer element is self-actuating - it automatically expands and sets the isolation barrier simply by being exposed to the well fluids present in the borehole. No external mechanical action, hydraulic pressure, or additional equipment is needed to activate the packing 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 isolation and formation of new perforations in a single wellbore trip without cross-flow, reducing environmental risks and resource waste, and eliminating the need for complex mechanical packer setting mechanisms.
Implementation Method 1
The apparatus includes at least one packer having a swellable seal material... swelling the seal material... exposing the seal material to a well fluid (e.g., water, hydrocarbon liquid, gas, etc.) in the well
Implementation Method 2
at least one packer having a swellable seal material... isolating at least one existing perforation by swelling the seal material
Data Source
AI summary
A method and apparatus for perforating and isolating perforations in a wellbore. A perforating and isolating apparatus includes at least one packer having a swellable seal material, and a perforating assembly attached to the packer. A method of perforating and isolating perforations in a subterranean wellbore includes the steps of: positioning an apparatus in the wellbore, the apparatus including at least one packer having a swellable seal material, and a perforating assembly attached to the packer; isolating at least one existing perforation by swelling the seal material; and forming at least one new perforation by actuating the perforating assembly.