Casing Exit Joint Guiding Profiles Milling Debris Control

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Solution Overview

Problem

The existing technologies for creating windows in high-strength casing exit joints for wellbores are challenging due to difficulties in milling, which results in debris generation, irregular window shapes, and potential misorientation, affecting hydrocarbon production and well completion operations.

Innovation Solution

A casing exit joint with inner and outer guiding profiles, comprising axial grooves and ridges, that guide the cutting tool to facilitate a controlled milling path and allow for flexible window orientation after cementing, reducing debris and enabling orientation adjustments post-installation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high-strength material is used for casing exit joint to withstand corrosive elements, then corrosion resistance is improved, but milling difficulty increases and debris generation increases

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidmilling difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by pre-milling the window in the casing exit joint before installation. This allows the window to be created in a controlled manufacturing environment where high-strength materials can be precisely machined, reducing milling difficulty and debris generation during downhole operations. The pre-milled window ensures the geometric control needed for high-strength materials while maintaining corrosion resistance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the milling operation into two distinct phases: pre-milling at the factory and finishing milling downhole. This segmentation allows the bulk of material removal to occur in a controlled manufacturing setting with proper debris management, while the downhole operation only requires minimal finishing, thereby reducing overall milling difficulty and debris issues despite using high-strength corrosion-resistant materials.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If pre-milled window is used in casing exit joint, then window geometric control is improved, but joint orientation flexibility is reduced

Engineering Contradiction:

Improvewindow geometric controlVSAvoidjoint orientation flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by pre-milling the window at the factory with precise geometric control, then allowing for orientation adjustment downhole through rotation of the casing exit joint. This sequential approach enables both precise window geometry and flexible orientation selection after installation, resolving the contradiction between manufacturing precision and adaptability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies dynamics by making the joint orientation adjustable rather than fixed. The casing exit joint can be rotated to different orientations after installation, allowing the window to be positioned optimally for the desired lateral wellbore direction. This dynamic orientation capability maintains geometric control while providing the needed flexibility and versatility.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If cutting tool is laterally displaced during milling, then window shape control is worsened, but irregular window shape creation occurs

Engineering Contradiction:

Improvemilling operation simplicityVSAvoidwindow shape control

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent introduces a guiding structure as an intermediary between the cutting tool and the casing exit joint. This guiding structure constrains the cutting tool path, preventing lateral displacement while maintaining simple milling operations. The guide ensures the window is created with proper geometric control without complicating the overall milling process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10927630B2Casing exit joint with guiding profiles and methods for use

Publication Date: 2021.02.23 HALLIBURTON ENERGY SERVICES INC

AI summary

A casing exit joint with guiding profiles and methods for use are provided. In one embodiment, a casing exit joint comprises: a substantially tubular casing joint comprising an inner surface and an outer surface, wherein at least a circumferential portion of the inner surface comprises a plurality of axial inner grooves. In certain embodiments, at least a circumferential portion of the outer surface may comprise a plurality of axial outer grooves. The casing exit joint may be disposed in a wellbore penetrating at least a portion of a subterranean formation, and a cutting tool may cut a window through at least a portion of the casing exit joint. In certain embodiments, the axial inner grooves and/or outer grooves may reduce the amount of milling debris, prevent lateral displacement of the cutting tool, and/or eliminate the need to pre-orient the casing exit joint to achieve the desired exit window.