Tri-radii liner for consistent oilfield perforation
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Solution Overview
Problem
In oilfield perforating, decentralized shaped charge carriers often result in varying casing hole diameters due to inconsistent distances of shaped charges from the casing, leading to uneven fluid flow and stimulation.
Innovation Solution
A tri-radii shaped charge liner with a conical geometry, featuring specific curvatures and radii, is used to minimize casing hole variation by optimizing the liner's shape and dimensions, allowing for consistent perforation regardless of carrier decentralization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a decentralized carrier is used, then ease of operation is improved, but manufacturing precision deteriorates due to varying distances from shaped charges to casing
Solution Approach 1:
The liner is designed with three distinct radii sections (first radius R1, second radius R2, third radius R3) where each section has different curvature characteristics. This local variation in geometry allows different portions of the liner to compensate for different distance variations from the casing wall, achieving consistent hole diameter despite carrier decentralization
Solution Approach 2:
The invention changes the geometric parameters of the liner by specifying precise radius ratios (R2/R1 = 0.5-1.5, R3/R1 = 0.2-0.8) and curvature relationships. These parameter modifications transform the liner's shape to inherently compensate for position variations, converting a precision problem into a geometric design solution
2Device complexity
If carrier decentralization is allowed, then device complexity is reduced, but reliability deteriorates due to uneven fluid flow through casing holes
Solution Approach 1:
Different sections of the liner wall have different radii of curvature (R1, R2, R3) that are specifically designed to compensate for the varying distances to the casing. This local differentiation ensures that each portion of the liner forms a hole of consistent diameter, guaranteeing reliable and uniform fluid flow through all perforations regardless of carrier position
Solution Approach 2:
The liner's tri-radii geometry inherently compensates for carrier decentralization without requiring external correction mechanisms. The specific curvature design allows the liner to self-adjust the hole formation process, eliminating the need for complex centralizing devices or active control systems
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 tri-radii liner reduces casing hole diameter variation by up to 8%, ensuring consistent fluid flow and improved stimulation across perforations, even when the carrier is not centrally positioned.
Implementation Method 1
The shaped charge includes a charge case containing an explosive load disposed within
Implementation Method 2
the shape of the explosive load and the shaped liner may determine the shape of a high-pressure, high-velocity jet generated by the detonation of the explosive load and the subsequent collapse of the shaped liner
Implementation Method 3
The jet may cause materials such as steel, cement, and rock formations to flow plastically around the jet path, thereby creating the desired perforation tunnel in the casing, cement, and surrounding formation
Data Source
AI summary
Provided are liners for a shaped charge and corresponding methods of use. An example liner comprises a generally conical shape having an apex, an open side, a liner wall comprising a thickness, and an axis extending through the center of the liner from the apex to the center of the open side. The liner comprises a liner height extending in a vertical plane from the center of the open side to the apex, a liner radius extending along a horizontal plane that is perpendicular to the axis at the open side of the liner and that extends from the axis to an outermost edge of the liner wall. The ratio of the liner height to the liner diameter is about 0.90 to about 1.10. The liner wall comprises an apex curvature, a first wall curvature, a second wall curvature, and a third wall curvature.