Drilling Stabilizer with Photo-Sensitive Coating for Lost Circulation
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Solution Overview
Problem
Current methods for plugging lost-circulation zones in subsurface formations require manual input and are responsive only after surface events occur, leading to significant fluid losses before the issue is recognized, as they rely on manual activation and surface observation of fluid loss or drill cutting reduction.
Innovation Solution
A drilling stabilizer with integrated pressure sensors and photo-sensitive coating encapsulated lost-circulation additives within a drilling fluid, where the pressure sensor automatically activates a light source to break the coating and release additives, increasing fluid viscosity to seal the lost-circulation zone upon detection of a pressure differential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual input and surface observation methods are used to detect lost-circulation zones, then personnel can identify the problem, but significant fluid losses occur before detection due to delayed response time
Solution Approach 1:
The system enables automatic detection and response to lost-circulation zones through downhole sensors that autonomously monitor pressure differentials and trigger remediation without requiring surface observation or manual intervention. The pressure sensor detects the pressure differential caused by fluid loss into the formation, and the system automatically activates the lost-circulation material deployment mechanism, eliminating the delayed response inherent in manual monitoring methods.
2Reliability
If traditional viscosified substances are injected as a pill to plug lost-circulation zones, then the zones can be sealed, but the process requires waiting for surface events to occur before activation
Solution Approach 1:
The system performs preliminary action by pre-positioning lost-circulation materials downhole in the wellbore adjacent to the lost-circulation zone before any surface events occur. The materials are held in place by a deployment mechanism that is automatically activated upon detection of pressure differential, eliminating the need to wait for surface observations and enabling immediate plugging action at the source of the problem.
3Ease of operation
If surface actuation methods are used to activate downhole tools through a communicative line, then tools can be activated, but manual input is required and response is delayed until surface events are observed
Solution Approach 1:
The system replaces manual surface actuation with automatic downhole detection and response. The pressure sensor continuously monitors for pressure differentials indicating lost-circulation conditions, and upon detection, the system automatically activates the lost-circulation material deployment without requiring any manual input or communication lines from the surface, achieving full automation of the detection and remediation process.
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
Enables immediate and automatic plugging of lost-circulation zones, reducing fluid losses and preventing further complications by initiating the sealing process autonomously when a pressure differential is detected, thus minimizing downtime and material costs.
Implementation Method 1
exposing photo-sensitive coating encapsulated lost-circulation additives within a lost-circulation fluid to light automatically after a lost-circulation zone causes a pressure differential. The light causes the lost-circulation additives to be released.
Implementation Method 2
The lost-circulation additives increase the viscosity of the lost-circulation fluid thereby plugging the lost-circulation zone.
Data Source
AI summary
A method for plugging a lost-circulation zone in a subsurface formation includes introducing a drillstem including a drilling stabilizer into a wellbore during drilling operations, the drilling stabilizer including at least stabilizer blades and a pressure sensor. Each stabilizer blade includes at least an inner chamber, a light source, and a window. The method further includes injecting a lost-circulation fluid, including a plurality of lost-circulation particles, into the wellbore. Each lost-circulation particle includes a lost-circulation additive encapsulated by a photo-sensitive coating. The method further includes measuring a pressure differential with the pressure sensor and providing a pressure signal to the light source of each stabilizer blade, thereby actuating the light source to produce a light beam, which allows the light beam to contact the photo-sensitive coatings of the lost-circulation particles to release the lost-circulation additives. The method further includes allowing the lost-circulation fluid to plug the lost-circulation zone.