Radiation-Activated Lost Circulation Material Prevention
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Solution Overview
Problem
Challenges arise during drilling and production operations due to fluid loss into subterranean formations, leading to issues such as well control problems, borehole instability, pipe sticking, and formation damage, particularly in zones with naturally occurring fractures or reduced pressure.
Innovation Solution
A treatment sub equipped with a radiation source is introduced into the wellbore to generate radiation, triggering resin and crosslinking agents within the wellbore fluid, forming a lost circulation material (LCM) to seal the leakage at the lost circulation zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mechanical LCM placement methods are used, then LCM can be positioned at the lost circulation zone, but the treatment requires multiple trips and extensive manual intervention increasing time and operational complexity
Solution Approach 1:
The patent replaces mechanical LCM placement methods with a radiation-activated chemical system. A radiation source (gamma, beta, or neutron) activates crosslinking agents in situ, causing LCM to form and solidify at the lost circulation zone without requiring mechanical insertion or multiple trips. This substitution of mechanical operations with radiation-activated chemical reactions dramatically reduces treatment time while maintaining placement precision.
Solution Approach 2:
The patent introduces the radiation source and crosslinking agents into the wellbore in advance, positioning them near the lost circulation zone before activation. The system is prepared with all necessary components (resin, crosslinking agent, radiation source) already in place, ready for rapid activation. This preliminary positioning eliminates the need for multiple trips to insert materials, reducing treatment time while ensuring precise LCM formation at the target location.
2Productivity
If radiation sources are used to activate crosslinking agents, then LCM formation is accelerated and treatment time is reduced, but the device complexity and safety requirements increase
Solution Approach 1:
The patent extracts the radiation source into a separate, self-contained treatment sub that can be independently handled and positioned. The radiation source is isolated in a shielded container within the treatment sub, separated from other wellbore components. This extraction allows the radiation activation function to be performed by a dedicated, relatively simple device rather than integrating complex radiation control systems into the entire drilling apparatus, thus increasing productivity without proportionally increasing overall device complexity.
3Reliability
If LCM is formed in situ through radiation activation, then treatment effectiveness is improved and fluid loss is reduced, but the risk of radiation exposure and environmental contamination increases
Solution Approach 1:
The patent employs thick-walled capsule shells to encapsulate both the crosslinking agents and the radiation source. These robust capsules serve as protective barriers that contain the radiation source during handling and transport, and also contain the crosslinking agents until activation. The capsule design provides inherent radiation shielding and containment, reducing exposure risks to personnel and environmental contamination while maintaining treatment effectiveness through controlled in-situ activation.
4Strength
If multiple chemical agents are introduced into the wellbore fluid, then LCM formation is enhanced and sealing capability is improved, but the complexity of chemical management and potential for unwanted reactions increases
Solution Approach 1:
The patent segments the chemical system into distinct functional components: resin base material, crosslinking agents (separated from the radiation source by shielding), and radiation source. Each component is introduced or positioned separately in the wellbore. The resin and crosslinking agent are mixed in the wellbore fluid, while the radiation source remains isolated in the treatment sub until activation is required. This segmentation allows for controlled chemical reactions to form strong LCM while simplifying chemical management by preventing premature or unwanted reactions through physical separation of reactive components.
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 method effectively mitigates fluid loss by forming LCM proximate to the lost circulation zone, enhancing operational safety, reducing non-productive time, and preventing wellbore fluid losses, thus protecting the environment and equipment.
Implementation Method 1
A treatment sub equipped with a radiation source is introduced into the wellbore to generate radiation, triggering resin and crosslinking agents within the wellbore fluid, forming a lost circulation material (LCM)
Data Source
AI summary
A system for treating a lost circulation zone within a wellbore that includes a treatment sub 300 is provided. The treatment sub 300 includes a communications device, an internal fluid conduit 1016 configured to convey a wellbore fluid through the treatment sub 100, and the interior 327 of the treatment sub 300 is between a sub exterior surface 328 and the internal fluid conduit 1016. The treatment sub 300 also includes a radiation source 352 configured to generate a form of radiation within a wellbore fluid. Further provided are methods of using the system to treat loss circulation zones.