Downhole Window Finder With Extendable Dog
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Solution Overview
Problem
The precise depth and orientation of downhole windows in wellbore tubulars are often unclear, making it difficult to properly position downhole equipment, leading to delays and increased costs in hydrocarbon exploration and production operations.
Innovation Solution
An apparatus with a deflector ramp and an extendable dog mechanism, where the dog can be hydraulically actuated to extend and align with the window, allowing for accurate positioning and alignment of the deflector ramp with the lateral borehole, facilitating the location and securing of equipment next to the window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to locate downhole windows, then equipment can be run into the wellbore, but precise positioning and orientation of the window becomes difficult, leading to operational delays
Solution Approach 1:
The deflector assembly is pre-positioned at the required depth and oriented appropriately before the actual window location operation. The extendable dog is retracted during running to prevent premature engagement, then extended only when needed to engage the window. This preliminary positioning with controlled engagement timing enables precise window location identification without causing operational delays.
2Measurement precision
If the extendable dog is always extended to engage the window, then precise window location can be achieved, but the deflector ramp cannot be properly aligned with the lateral borehole
Solution Approach 1:
The dog is designed to be mechanically extendable and retractable rather than fixed in position. It is retracted during the running operation to allow the deflector ramp to be properly aligned with the lateral borehole, then extended only when needed to engage the window and detect its precise location. This dynamic positioning resolves the conflict between alignment requirements and detection accuracy.
3Ease of manufacture
If a whipstock assembly is used to deflect the milling tool, then the window can be formed, but the precise depth and orientation of the window remains unclear
Solution Approach 1:
The extendable dog on the deflector assembly provides real-time feedback by mechanically engaging with the window when properly positioned. This engagement provides tactile and visual confirmation of the window's precise depth and orientation, allowing operators to accurately locate and verify window position rather than relying on pre-formed window data alone.
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
This solution enables efficient and accurate location of downhole windows, reducing operational delays and costs by ensuring precise positioning of equipment, thereby enhancing the effectiveness of operations such as coal bed methane well maintenance and debris removal.
Implementation Method 1
the sleeve is hydraulically actuatable to release the extendable dog from the retracted position to the extended position
Data Source
AI summary
An apparatus for finding a pre-existing downhole window includes a body having a deflector ramp and a cavity, and an extendable dog disposed in the cavity, the dog mechanically moveable between a retracted position and an extended position into the pre-existing window. In some embodiments, the apparatus includes an axially moveable sleeve disposed adjacent the extendable dog. A downhole window finding apparatus includes a deflector including a window finding assembly, and a running tool removably coupled to the deflector, wherein the window finding assembly includes an extendable member and an axially moveable sleeve retaining the extendable member. In certain embodiments, a fluid flow path extends through the running tool and the deflector to the window finding assembly. In some embodiments, a shear bolt removably couples the running tool to the deflector and includes a fluid passage fluidicly coupling a flow line in the running tool to a flow line in the deflector. A method of finding a pre-existing downhole window is also disclosed.