Downhole Perforation Tool With Movable Port Covers
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Solution Overview
Problem
Existing perforation tools struggle to control or isolate the flow of hydrocarbons into a wellbore after perforations are made, leading to inefficiencies in hydrocarbon production.
Innovation Solution
A downhole perforation tool system that includes an upper sub-assembly, multiple perforation sub-assemblies with perforation guns and ports, a main wellbore seal for anchoring, and secondary wellbore seals for fluid isolation, allowing for controlled perforation and isolation in a single run.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional perforation guns are used to create perforations in casing, then effective flow communication between cased wellbore and productive reservoir is achieved, but the ability to control or isolate flow of hydrocarbons into the wellbore is lost
Solution Approach 1:
The tool is divided into multiple perforation sub-assemblies (first, second, third) that can be independently activated. Each sub-assembly has its own port covers and can be controlled separately, allowing selective isolation of different perforation zones while maintaining production from others.
Solution Approach 2:
Port covers act as intermediary elements between the perforation guns and the wellbore. These covers can move to open or close ports, providing a mechanical means to control hydrocarbon flow into the wellbore without requiring cement or other permanent isolation methods.
2Ease of operation
If multiple perforation stages are performed to isolate different zones, then zone-specific production control is achieved, but rig time and operational complexity increase
Solution Approach 1:
Multiple perforation sub-assemblies with independent control capabilities are combined into a single tool that can be deployed in one run. The tool integrates first, second, and third perforation sub-assemblies with their own port covers and activation mechanisms, enabling multi-zone isolation without requiring multiple separate operations.
Solution Approach 2:
The tool is designed as a multi-functional device that can perform perforation and isolation operations in multiple zones simultaneously. Each sub-assembly can be independently activated and controlled, making the single tool equivalent to multiple separate tools or operations.
3Reliability
If cement is used as an isolation mechanism, then fluid isolation between zones is achieved, but the ability to re-open or adjust flow paths is lost
Solution Approach 1:
The port covers are designed as movable components that can transition between open and closed positions. This dynamic capability allows the isolation mechanism to be adjusted or reversed, unlike static cement plugs. The covers can be actuated by external tools or internal mechanisms to control flow paths as needed.
Solution Approach 2:
The port covers can be discarded (left in place to block ports) or recovered (retrieved to open ports). This provides flexibility where the isolation mechanism can be permanently set or temporarily applied and then removed, enabling re-opening of flow paths without requiring drilling out cement or other permanent isolation methods.
Data Source
AI summary
A downhole perforation tool includes an upper sub-assembly configured to couple to a downhole conveyance within a wellbore that is formed from a terranean surface toward a subterranean formation; and a plurality of perforation sub-assemblies. Each perforation sub-assembly includes one or more perforation guns, and one or more ports configured to fluidly couple the wellbore with a bore that extends from the one or more ports to the upper sub-assembly. The downhole perforation tool further includes a main wellbore seal positioned between the upper sub-assembly and the plurality of perforation sub-assemblies and actuatable to anchor the downhole perforation tool to a casing in the wellbore. The downhole perforation tool further includes at least one secondary wellbore seal positioned between adjacent perforation sub-assemblies of the plurality of perforation sub-assemblies. The at least one secondary wellbore seal is actuatable to fluidly isolate a portion of an annulus of the wellbore from another portion of the annulus of the wellbore.