Lost Circulation Fabric for Wellbore Fluid Loss Control
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Solution Overview
Problem
Lost circulation during drilling operations leads to significant non-productive time and increased costs due to the seepage of drilling fluid into highly permeable, fractured, or unconsolidated formations, causing potential drilling issues like kick, blowout, and borehole collapse.
Innovation Solution
The use of a lost circulation fabric (LCF) and a slurry of lost circulation material (LCM) is applied to selected areas of the wellbore to reduce fluid loss, where LCF is deployed around the wellbore wall and combined with a slurry containing particles of varying sizes to form a filter cake that impedes fluid leakage, thereby reducing fluid loss into the formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drilling fluid is circulated through the drill string to remove cuttings and cool the drill bit, then drilling efficiency is improved, but drilling fluid is lost into the formation through seepage in high permeable, fractured, or unconsolidated formations
Solution Approach 1:
A lost circulation fabric is introduced as an intermediary element between the drilling fluid and the formation. The fabric acts as a filter that allows the drilling fluid to continue circulating through the drill string for efficient drilling, while simultaneously preventing the fluid from seeping into the formation through its selective permeability. This mediator resolves the contradiction by enabling both drilling efficiency and fluid conservation.
Solution Approach 2:
The lost circulation fabric is constructed as a porous material with specific pore sizes that allow controlled fluid passage. The porous structure enables the fabric to permit drilling fluid flow for cooling and cuttings removal while blocking the fluid from entering the formation through seepage paths. This porous material solution simultaneously achieves drilling productivity and reduces fluid loss.
2Loss of substance
If lost circulation fabric is deployed around the wellbore wall to reduce fluid loss, then drilling fluid loss is reduced, but the complexity of the drilling system increases
Solution Approach 1:
The lost circulation fabric is implemented as a flexible thin film or shell that can be easily deployed around the wellbore wall. The flexible nature of the fabric allows it to conform to the wellbore geometry and be installed with minimal additional equipment or system complexity. This thin film approach reduces fluid loss while maintaining system simplicity.
Solution Approach 2:
The lost circulation fabric is designed to be self-deploying and self-adjusting within the wellbore environment. Once introduced, the fabric automatically positions itself around the wellbore wall and adjusts to maintain effective sealing without requiring complex control systems or additional operational steps. This self-service characteristic minimizes the increase in drilling system complexity.
3Reliability
If slurry with particles of varying sizes is circulated to form filter cake, then fluid leakage is impeded, but the complexity of slurry preparation increases
Solution Approach 1:
The slurry is formulated with particles of varying sizes, and the circulation process utilizes changes in pressure and flow parameters to achieve effective filter cake formation. By controlling these parameters during circulation, the system creates a reliable barrier against fluid leakage without requiring complex preparation procedures. The parameter changes during normal drilling operations simplify the overall process.
Solution Approach 2:
The slurry with varying particle sizes is combined with the existing drilling fluid circulation system, merging the filter cake formation process with standard drilling operations. This integration allows the slurry to be circulated through the existing drill string and mud system, eliminating the need for separate, complex slurry preparation and delivery equipment while achieving reliable leakage control.
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 method effectively reduces fluid loss by forming a filter cake that limits further leakage, significantly minimizing the risk of drilling complications and maintaining drilling fluid levels, thus enhancing well control and reducing operational costs.
Implementation Method 1
forming a filter cake that impedes fluid leakage
Implementation Method 2
LCF is deployed around the wellbore wall and combined with a slurry containing particles of varying sizes to form a filter cake that impedes fluid leakage
Data Source
AI summary
A wellbore loss zone remediation method to reduce losses of drilling fluid in a lost circulation zone of a wellbore is described. The wellbore loss zone remediation method includes identifying a lost circulation zone in a wellbore, selecting a lost circulation fabric, selecting a lost circulation material for a slurry, disposing the lost circulation fabric in the wellbore, circulating the slurry in the wellbore, and determining if the lost circulation zone is remediated.