Radiation-Triggered Wellbore Sealant Composition
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Solution Overview
Problem
Current cementing methods in hydrocarbon exploration face challenges in controlling the setting time of cement compositions in subterranean environments, leading to unpredictable results due to temperature and pressure gradients, with existing set retarders and accelerators often causing premature or delayed setting, which can compromise the structural integrity of the cement and result in delays in drilling operations.
Innovation Solution
A wellbore treatment fluid composition that includes a set modifier component, which is altered by ionizing radiation to control the mechanical strength, incorporating a polymeric component that forms an encapsulating layer and can include accelerators, oxidizing agents, and set retarders, allowing for precise control over the setting process through radiation-induced degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If set retarding additives are used to extend setting time for adequate pumping, then pumping time is improved, but waiting-on-cement time is extended and gas migration risk increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing the set modifier component with the cement composition before pumping, but the actual setting modification is triggered only after placement through exposure to ionizing radiation or chemical reaction. This allows the cement to remain pumpable during transportation and placement, then rapidly set once in position, eliminating the need for extended waiting-on-cement time while ensuring adequate pumping time.
Solution Approach 2:
The patent changes the parameter of setting time control from a fixed chemical additive system to a controllable trigger-based system. By using ionizing radiation or chemical triggers to activate the set modifier, the setting time can be precisely controlled based on when placement is complete, rather than being determined solely by the initial mixing ratio of retarders, allowing optimization of both pumping time and waiting-on-cement time.
2Duration of action of moving object
If hydroxy carboxylic acid is used as cement retarder, then setting time is extended, but cement remains fluid too long causing gas invasion and migration
Solution Approach 1:
The patent changes the parameter of setting time control from a fixed chemical additive system to a controllable trigger-based system. By using ionizing radiation or chemical triggers to activate the set modifier, the setting time can be precisely controlled based on when placement is complete, rather than being determined solely by the initial mixing ratio of retarders, allowing optimization of both pumping time and waiting-on-cement time.
Solution Approach 2:
The patent introduces an intermediary trigger mechanism (ionizing radiation or chemical trigger) that mediates between the set modifier component and the cement composition. This intermediary allows precise control over when the setting process begins, preventing premature setting while ensuring rapid setting after placement, thereby maintaining cement structural integrity and preventing gas invasion.
3Loss of time
If accelerators are added to overcome set retarder effects, then setting time is reduced, but risk of premature setting increases
Solution Approach 1:
The patent applies preliminary action by pre-positioning the set modifier component in the cement composition but keeping it inactive during pumping and placement. The activation trigger (ionizing radiation or chemical) is applied only after the cement is in its final position, ensuring that setting begins at the optimal moment and cannot occur prematurely during handling or placement operations.
Solution Approach 2:
The patent segments the setting modification function into separate components: the set modifier component is prepared in advance but kept separate and inactive during pumping, then activated only after placement through trigger exposure. This segmentation allows the cement to be pumped and placed without risk of premature setting, then set rapidly and controllably once in position.
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 approach enables technicians to control the setting time of the cement composition, reducing waiting-on-cement time and ensuring the structural integrity of the cement, while minimizing the risk of premature or delayed setting, thus enhancing operational efficiency in hydrocarbon exploration.
Implementation Method 1
The sealant composition is placed into a wellbore and subjected to ionizing radiation to alter the set modifier. The altered set modifier acts to increase the mechanical strength of the sealant composition.
Data Source
AI summary
The present invention relates to compositions useful for isolating a portion of a wellbore. In one embodiment, a composition includes a sealant composition containing a wellbore treatment fluid and a set modifier component. The sealant composition can be placed into the wellbore and subjected to ionizing radiation that alters the set modifier component, triggering the setting of the sealant composition.