Whipstock Tool Assembly for Multilateral Well Drilling
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Solution Overview
Problem
Conventional methods for constructing multilateral wells for multistage fracturing are costly and complex due to the need for increased well casing size, longer drilling times, and the requirement for different surface crews and rig setups for drilling and fracturing operations, leading to increased costs and downtime.
Innovation Solution
A downhole tool assembly featuring a whipstock with a channel and a ball-actuated valve for selective fluid flow control, allowing for simultaneous drilling and fracturing operations with reduced crew and rig changes, utilizing a removable core and flow control device to direct fluid flow between branches of a well.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used for constructing multilateral wells for multistage fracturing, then the well structure can be established, but the construction costs increase and drilling time extends due to increased well casing size requirements
Solution Approach 1:
The whipstock device is segmented into multiple functional components: a body portion, a removable core, and a flow control device. This segmentation allows each component to perform its specific function efficiently - the body provides structural support, the core creates the initial wellbore path, and the flow control device manages fluid distribution to different lateral branches, eliminating the need for oversized casing
Solution Approach 2:
The whipstock acts as an intermediary device between the main wellbore and lateral branches. It provides a controlled interface for creating junctions and managing fluid flow, replacing the need for enlarged casing that would otherwise be required to accommodate multiple wellbore paths and isolation mechanisms
2Reliability
If conventional methods are used for constructing multilateral wells, then the well structure can be established, but the overall construction complexity increases
Solution Approach 1:
The whipstock device performs multiple functions within a single integrated structure: it serves as a mechanical plug to isolate the lower portion of the main wellbore, provides an angled work face for orienting the drill bit to create lateral branches, and incorporates a flow control device for directing fracturing fluids to different branches. This multi-functionality eliminates the need for separate devices for each function, reducing overall construction complexity
Solution Approach 2:
The invention merges the isolation function, directional drilling guidance function, and fluid flow control function into a single whipstock device. By combining these functions that would traditionally require separate components or procedures, the overall construction process becomes less complex while maintaining well structure reliability
3Reliability
If different surface crews and rig setups are used for drilling and fracturing operations, then each operation can be performed with specialized equipment, but operational costs increase and downtime occurs due to crew and rig changes
Solution Approach 1:
The flow control device incorporates a shiftable sleeve that can be dynamically repositioned to direct fluid flow to different lateral branches. This dynamic capability allows the same rig and crew to perform both drilling and fracturing operations, and to switch between different well branches without requiring physical reconfiguration of equipment or crew changes, thereby maintaining operational efficiency
4Productivity
If a whipstock is used to isolate the lower portion of the main wellbore and provide an angled work face, then lateral wells can be drilled efficiently, but the whipstock must be removed or destroyed after drilling, adding operational steps
Solution Approach 1:
The flow control device is preliminarily positioned within the whipstock body before drilling operations begin. The shiftable sleeve is pre-configured to control fluid flow paths. After drilling is complete, the core is removed and the flow control device remains in place, already positioned to manage fracturing operations. This preliminary arrangement eliminates the need for additional operational steps to install flow control mechanisms after drilling
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 efficient drilling and fracturing of multilateral wells with reduced operational time and costs by allowing for sequential fracturing of different well sections without the need for frequent crew and rig changes, enhancing hydrocarbon extraction efficiency.
Implementation Method 1
a valve comprising a shiftable sleeve for selectively directing fluid flow to the branched well or to the channel in the whipstock body
Implementation Method 2
a core that is removably mounted in the channel, the core having a work face for orienting a drill to drill the branched well
Implementation Method 3
a flow control device comprising a second coupling structure for coupling with the first coupling structure to engage the whipstock body
Data Source
AI summary
Downhole tool assembly comprises a whipstock engageable with a flow control device. The whipstock comprises a channel. A core is removably mounted in the channel. The flow control device comprises a valve with a shiftable sleeve for selectively directing fluid flow. In a process of drilling and operating a branched well, the whipstock is anchored at a junction in a first well. A second well is drilled from the junction in a direction defined by the work face of the whipstock. After drilling, the core is removed to open the channel in the whipstock. The valve can be set to direct fluid flow to the second well so a fluid pressure can be applied to the second well. The valve can also be set to direct fluid flow through the channel to the first well, so a fluid pressure can be applied to the first well.