Wellbore Packer Segmentation for Zonal Isolation and Gravel Packing
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Solution Overview
Problem
Current sand control methods in hydrocarbon production face challenges such as loss of sand control, equipment damage, reduced well productivity, and increased costs due to water production and gas breakthrough in wells with varying formation strengths, especially in deepwater and high-pressure environments, where zonal isolation is difficult to achieve without compromising gravel pack integrity.
Innovation Solution
The use of packers with alternative path mechanisms and manifold regions to provide zonal isolation and fluid communication between sand control devices, allowing for complete gravel packing and selective isolation of intervals, thereby preventing water and gas production from interfering with hydrocarbon production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sand control devices are used to retain solid material, then sand production is controlled, but the devices are susceptible to damage from high stress, erosion, and plugging in harsh environments
Solution Approach 1:
The wellbore is divided into multiple isolated zones using packers, with each zone having its own sand control device. This segmentation allows independent optimization of each zone's sand control system, reducing the risk that damage to one device affects the entire well. Each segmented zone can be gravel packed independently, ensuring complete coverage without compromising overall reliability.
Solution Approach 2:
Gravel packs are installed beforehand to cushion and protect sand control devices from high stress and erosion. The gravel pack acts as a protective barrier between the formation sand and the sand control device, reducing direct exposure to harmful forces while maintaining sand control functionality.
2Reliability
If gravel packing is performed in thick or inclined production intervals, then sand control is improved, but carrier fluid loss forms sand bridges that prevent complete gravel packing
Solution Approach 1:
The thick or inclined production interval is divided into multiple smaller zones using packers. Each zone is gravel packed separately, which prevents carrier fluid from being lost to the entire thick interval at once. This eliminates sand bridge formation and ensures complete gravel packing in each segmented zone, maintaining both integrity and completeness.
Solution Approach 2:
Packer isolation is established beforehand before gravel packing each zone. This preliminary action prevents carrier fluid loss to unprepared zones, ensuring that gravel slurry remains available to complete the gravel pack in the current zone without forming sand bridges.
3Reliability
If packers are used to isolate zones for gravel packing, then zonal isolation is achieved, but the complexity of the completion system increases
Solution Approach 1:
The packers serve multiple functions: they provide zonal isolation for gravel packing, create separate flow paths for carrier fluid, enable independent gravel packing of each zone, and allow for future selective production or injection operations. This multi-functionality justifies the added complexity by delivering multiple benefits from a single component.
Solution Approach 2:
The completion system is segmented into modular zones, each independently controllable. This segmentation allows for flexible configuration where packers are placed only where needed based on formation characteristics, optimizing the balance between isolation capability and system complexity rather than uniformly applying isolation throughout the entire well.
4Productivity
If water production is allowed in wells with varying formation strengths, then production rates are maintained, but water handling and disposal costs increase
Solution Approach 1:
The well is segmented into multiple zones using packers, allowing selective production from zones with different formation strengths. Water-producing zones can be isolated and individually managed, enabling continued production from hydrocarbon zones while minimizing water handling costs through targeted isolation rather than complete water disposal.
Solution Approach 2:
Each zone is given different production characteristics based on its local formation properties. Zones with high water production potential can be isolated and managed separately, while zones with good hydrocarbon potential are optimized for production. This local optimization reduces overall water handling costs while maintaining productivity from viable zones.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3C
AI summary
A method, system and apparatus associated with the production of hydrocarbons from a subsurface reservoir are described. Embodiments of the method include a plurality of sand control devices and gravel packers with primary and secondary flow paths, in different intervals, with fluid communication among the flow paths, and treatment fluid injected into the flow paths of the wellbore. Hydrocarbons are then produced from the wellbore by passing hydrocarbons through the sand control devices with different intervals providing zonal isolation.