Graphene Oxide Thixotropic Cement for Lost Circulation Control
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Solution Overview
Problem
Existing cement compositions struggle to effectively manage fluid loss in wellbores due to lost circulation zones, requiring compositions that maintain low viscosity under shear but develop gel strength quickly when static, and provide rapid compressive strength for effective wellbore servicing.
Innovation Solution
A thixotropic cement composition incorporating silica fume and graphene oxide to stabilize viscosity and enhance gel strength, minimizing variations in quality and ensuring effective fluid control and rapid setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cement compositions are used, then they provide basic cementing function, but they fail to effectively control fluid loss and develop gel strength quickly in lost circulation zones
Solution Approach 1:
The patent uses a composite material system combining cementitious material, silica fume, and graphene oxide to achieve both rapid gel strength development and effective fluid loss control. The synergistic interaction between these components creates a thixotropic slurry that develops gel strength quickly while maintaining fluid loss control properties.
Solution Approach 2:
The patent modifies the rheological parameters of the cement slurry by adding silica fume and graphene oxide, transforming it into a thixotropic material. This parameter change enables the slurry to exhibit time-dependent viscosity behavior, developing gel strength rapidly when static while remaining pumpable during circulation.
2Reliability
If cement composition viscosity is increased to control fluid loss, then fluid loss control improves, but the composition becomes difficult to pump and circulate
Solution Approach 1:
The patent creates a dynamic viscosity system using thixotropic cement composition that adapts its flow properties based on applied shear stress. During pumping and circulation, the slurry maintains low viscosity for ease of operation, but when static in lost circulation zones, it rapidly develops high viscosity and gel strength for fluid loss control.
Solution Approach 2:
The thixotropic cement composition automatically adjusts its own viscosity based on flow conditions without requiring external control. The silica fume and graphene oxide components enable the slurry to self-regulate its rheological properties, maintaining pumpability during circulation and developing gel strength when stationary.
3Strength
If rapid compressive strength development is achieved, then wellbore servicing effectiveness improves, but the composition may set too quickly during placement
Solution Approach 1:
The patent separates the gel strength development function from the compressive strength development function by incorporating silica fume and graphene oxide. This segmentation allows the slurry to develop gel strength quickly for fluid loss control while maintaining a controlled setting time for adequate placement, with compressive strength developing rapidly after placement.
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
The composition achieves enhanced gel strength and viscosity control, reducing fluid loss and facilitating efficient wellbore servicing by minimizing undesired fluid communication and ensuring rapid setting.
Implementation Method 1
the cement composition can ideally be thixotropic, maintaining a low viscosity while under shear, but, when allowed to remain static, the wellbore servicing fluid can develop gel strength quickly
Implementation Method 2
when allowed to remain static, the wellbore servicing fluid can develop gel strength quickly with the ability to thin and flow when shear is re-applied
Data Source
AI summary
A method of servicing a wellbore penetrating a subterranean formation with a thixotropic cement composition is provided. The thixotropic cement composition includes a cementitious material, silica fume, graphene oxide, and an aqueous fluid, can have a 10-minute gel strength of from about 20 lbf/100 ft2 to about 300 lbf/100 ft2, and can be used to service a wellbore (e.g., to reduce lost circulation in the wellbore). By incorporating graphene oxide into the thixotropic cement composition, the thixotropic cement composition can have a higher 10-minute gel strength than a reference composition absent the graphene oxide.