Solid State Lost Circulation Material for Drilling
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Solution Overview
Problem
Conventional methods for mitigating lost circulation zones during hydrocarbon drilling are often ineffective and time-consuming, as they require multiple attempts and can compromise wellbore safety due to the need for cementing and waiting for cement to set.
Innovation Solution
A solid-state lost circulation apparatus comprising a drillable tube with an expandable layer that activates and hardens upon exposure to an activation agent, forming a fluid-tight seal across the lost circulation zone, allowing for immediate sealing without the need for cementing and reducing wellbore risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cementing methods are used to seal lost circulation zones, then the wellbore safety is improved, but the time required for the process increases significantly due to waiting for cement to set
Solution Approach 1:
The patent changes the physical and chemical parameters of the sealing material from conventional cement to an expandable polymer composition. This polymer undergoes phase transition upon contact with drilling fluid, expanding and hardening to form a seal. The activation energy and expansion ratio are controlled through chemical composition adjustments, allowing the material to set rapidly without long waiting periods while maintaining wellbore safety.
Solution Approach 2:
The expandable polymer composition utilizes phase transition as its core mechanism. The polymer starts in a compact, transportable state and transitions to an expanded, sealed state upon contact with the activation agent (drilling fluid). This phase change occurs rapidly, eliminating the long setting time associated with cement while providing reliable wellbore sealing.
2Reliability
If multiple attempts are made to mitigate lost circulation zones, then the sealing effectiveness may be improved, but the overall process becomes more time-consuming and complex
Solution Approach 1:
The apparatus is prepared in advance with the expandable polymer composition contained within a drillable tube and isolation layer. The polymer is pre-positioned at the lost circulation zone before activation. Upon deployment, the polymer is already in place and only requires activation contact to expand and seal, eliminating the need for multiple deployment attempts and reducing total mitigation time while maintaining sealing effectiveness.
Solution Approach 2:
The expandable polymer composition is self-activating upon contact with the drilling fluid (activation agent). The polymer automatically expands and hardens without requiring additional intervention, multiple attempts, or complex activation procedures. This self-service characteristic reduces the number of attempts needed while ensuring reliable sealing.
3Reliability
If conventional lost circulation materials are introduced into drilling fluid, then the lost circulation zone may be plugged, but the process requires multiple attempts and compromises wellbore safety
Solution Approach 1:
The sealing system is segmented into distinct functional components: the drillable tube for containment and delivery, the isolation layer for protection, and the expandable polymer composition for sealing. This segmentation allows each component to perform its specific function efficiently, ensuring wellbore safety while enabling continuous drilling operations through reliable single-attempt sealing.
Solution Approach 2:
The apparatus utilizes composite materials including the drillable tube material, isolation layer material, and expandable polymer composition. These composite materials provide combined properties of drillability, chemical isolation, rapid expansion, and durable sealing, achieving wellbore safety and operational continuity simultaneously without requiring multiple attempts.
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 apparatus effectively seals lost circulation zones, allowing for resumed drilling operations with a single application, reducing fluid loss and wellbore risk, and maintaining a stable seal even under tool movement and fluid flow.
Implementation Method 1
the expandable layer activates, expands, and hardens into a hardened and expanded expandable layer
Implementation Method 2
the expandable layer activates, expands, and hardens into a hardened and expanded expandable layer
Implementation Method 3
the isolation layer is non-reactive to the activation agent and that is a drillable material... coupled to the exterior surface of the expandable layer such that the exterior surface of the expandable layer is physically and chemically isolated from introduction to the activation agent
Implementation Method 4
The isolation layer may be configured to rupture upon a sufficient force being introduced to the interior surface by an expanding expandable layer
Implementation Method 5
forming a fluid-tight seal across the lost circulation zone
Data Source
AI summary
Provided is a solid-state lost circulation apparatus that may comprise a drillable tube with one or more fluid ports, an expandable layer, and an isolation layer. Upon introduction of the expandable layer to an activation agent through one or more fluid ports, the expandable layer may activate, expand, and harden into a hardened and expanded expandable layer, while rupturing the isolation layer. Further provided is a lost circulation assembly system that may include a drill pipe and a solid-state lost circulation apparatus. Further provided is a method of mitigating a lost circulation zone with a lost circulation assembly system. Further provided is a solid plug that may be positioned in a wellbore and may include a hardened and expanded expandable layer and a drillable tube. Further provided is a remnant of a solid plug that may form a fluid-tight seal across a face of a lost circulation zone.