Downhole Driving Tool for Deviated Well Placement
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Solution Overview
Problem
In deviated wells, particularly those drilled using non-rotary techniques like coiled tubing or wireline drilling, the placement of completion equipment is challenging due to reduced gravity and increased drag, leading to issues like hole collapse and equipment sticking, as conventional methods rely on a drill string for force application which is absent in these scenarios.
Innovation Solution
A downhole driving tool with an energy accumulator and release mechanism, such as a hydraulic or electric system, is used to accumulate and release energy, providing a driving force to move equipment along the borehole through a moveable member impacting an anvil, allowing for forceful placement without the need for a drill string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional casing placement methods are used in deviated wells, then equipment can be placed in vertical sections, but drag and gravity effects prevent proper placement in highly deviated or horizontal sections
Solution Approach 1:
The completion equipment is divided into modular segments that can be pushed through the deviated section in manageable units. The system uses a pusher tool that can be detached and repositioned to continue pushing equipment through challenging well sections, breaking down the continuous placement operation into discrete pushable segments.
Solution Approach 2:
The system applies downward force from the surface using wireline or coiled tubing to counteract the reduced gravity effects in deviated sections. By tensioning the wireline or coiled tubing, the system creates a pulling force that helps overcome drag and pushes equipment into the deviated or horizontal wellbore.
2Ease of operation
If no casing is used in deviated sections to allow equipment placement, then equipment can reach the target, but hole collapse and sanding occur due to lack of support
Solution Approach 1:
The system establishes a stable base in the vertical section before attempting to place equipment in deviated sections. By first securing the vertical section with casing or liner, the system creates a stable platform from which to push equipment through deviated sections, preventing hole collapse during the placement operation.
Solution Approach 2:
The system uses an intermediate pusher tool or tractor device that travels through the deviated section to push completion equipment into place. This intermediary device can navigate the deviated geometry while providing the necessary pushing force, acting as a mediator between the surface equipment and the completion tools in the horizontal section.
3Reliability
If drilling jars are used to overcome stuck pipe, then axial shocks can be applied to unstick drill pipe, but such techniques are not applicable when no drill string is present
Solution Approach 1:
The system incorporates self-contained pushing and jarring capabilities within the downhole tool assembly itself, eliminating the need for external drill string operations. The tool can accumulate and release energy to generate its own jarring forces, or use the weight and tension of the wireline/coiled tubing to create the necessary shocks to free stuck equipment.
Solution Approach 2:
The system uses hydraulic or pneumatic mechanisms to generate jarring forces and control the movement of equipment through deviated sections. By pressurizing fluid in a controlled manner, the system can create sudden pressure releases that generate shocks similar to mechanical jars, or provide continuous pushing force to move equipment through the wellbore.
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 effective placement of completion equipment in deviated wells by applying significant forces to overcome drag and gravity, preventing hole collapse and equipment sticking, even in horizontal sections where conventional methods fail.
Implementation Method 1
operation of the driving tool comprising accumulating energy in the driving tool and releasing the energy to force a moveable member against an impact surface in the tool to provide a driving force
Implementation Method 2
A downhole driving tool with an energy accumulator and release mechanism, such as a hydraulic or electric system, is used to accumulate and release energy
Implementation Method 3
releasing the energy to force a moveable member against an impact surface in the tool to provide a driving force which is applied to the equipment to move it along the borehole
Data Source
AI summary
A method and downhole tool are presented herein for driving completion equipment in a borehole. The method comprises the steps of positioning the completion equipment in the borehole; and moving the completion equipment along the borehole by operation of a downhole driving tool connected to the completion equipment. Operation of the driving tool comprises accumulating energy in the driving tool and releasing the energy to force a moveable member against an impact surface in the driving tool to provide a driving force which is applied to the completion equipment to move the completion equipment in the borehole, wherein the step of accumulating energy in the driving tool comprises providing energy to the driving tool by means of an energy source located at the surface selected from the group consisting of an electrical energy source provided by a wireline cable, a hydraulic energy source provided by a pipe, and combinations thereof.