Nanoparticulate Drill-In Fluids for Subterranean Formation Consolidation
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Solution Overview
Problem
Subterranean formations with weakly consolidated intervals pose challenges during drilling and production due to unconsolidated particles, which limit fluid recovery and well productivity, as traditional consolidation methods are ineffective and can cause formation damage.
Innovation Solution
Incorporating nanoparticulates into drill-in fluids that penetrate the formation to consolidate unconsolidated particles during drilling, forming stable bridges and networks to anchor particles in place, thereby preventing their migration and enhancing formation stability without reducing permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional consolidating agents are used to treat the formation, then unconsolidated particles may be stabilized, but the agents aggregate disproportionally in the portion of the wellbore closer to the initiation point and are difficult to handle and place
Solution Approach 1:
The patent changes the physical parameters of the consolidating agent by using nanoparticulates (1-100 nm size) instead of traditional larger consolidating agents. This parameter change enables the agent to penetrate deep into the formation while maintaining stability, eliminating the aggregation problem that occurs with traditional agents in the wellbore initiation portion.
Solution Approach 2:
The patent replaces the mechanical handling and placement of traditional consolidating agents with a fluid delivery system that circulates nanoparticulates through the drill-in fluid. This substitution eliminates the difficulty of manual handling and placement, allowing the consolidating agent to be delivered automatically during the drilling process.
2Stability of the object's composition
If traditional consolidating agents are used, then formation stabilization may occur, but permeability damage results
Solution Approach 1:
The patent utilizes the porous nature of nanoparticulates to achieve consolidation without permeability damage. The small size and porous structure of the nanoparticulates allow them to penetrate into the formation pores and bond unconsolidated particles together while maintaining the overall permeability of the formation, unlike traditional agents that block pores and cause permeability damage.
Solution Approach 2:
The patent employs composite materials by combining nanoparticulates with drill-in fluid to create a unified delivery system. This composite approach allows the consolidating agent to be transported through the fluid while maintaining its nanoscale properties that enable effective consolidation without permeability damage.
3Stability of the object's composition
If gravel packing or frac-packing techniques are used to prevent particle movement, then unconsolidated particles are controlled, but consolidation must be performed after drilling and additional particles are created during drilling
Solution Approach 1:
The patent applies preliminary action by incorporating nanoparticulates into the drill-in fluid before drilling begins. The nanoparticulates are delivered to the formation during the drilling process itself, performing consolidation in advance before the wellbore is completed and before production starts. This eliminates the need for separate post-drilling consolidation operations.
Solution Approach 2:
The patent merges the drilling operation with the consolidation operation by integrating nanoparticulate delivery into the drill-in fluid circulation system. This combination allows both drilling and consolidation to occur simultaneously in a single operational sequence, eliminating the need for separate gravel packing or frac-packing operations.
4Productivity
If conventional drill-in fluids are used, then drilling operations can be performed, but unconsolidated particles are not stabilized and fluid recovery is limited
Solution Approach 1:
The patent applies universality by designing the drill-in fluid to serve multiple functions: it transports cuttings from the wellbore, provides hydrostatic pressure for wellbore stability, and delivers nanoparticulates for formation consolidation. This multi-functionality allows the single fluid system to achieve both drilling and consolidation objectives, improving fluid recovery without requiring separate consolidation operations.
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 use of nanoparticulates allows for simultaneous drilling and consolidation, improving well productivity by stabilizing unconsolidated particles and preventing their migration, thus enhancing fluid recovery and reducing the need for costly remedial operations.
Implementation Method 1
The nanoparticulates may be coated or impregnated with a delayed tackifying agent... The nanoparticulates in the drill-in fluid contact the unconsolidated particles in the subterranean formation at the reservoir zone by penetrating into the subterranean formation, and as a result provide consolidation or cohesion to the unconsolidated particles, thereby anchoring them in place.
Implementation Method 2
provide consolidation or cohesion to the unconsolidated particles, thereby anchoring them in place
Data Source
AI summary
Embodiments herein include methods comprising providing a drill-in fluid comprising an aqueous base fluid and nanoparticulates; providing a drilling apparatus comprising a drill string and a drill bit; circulating the drill-in fluid while drilling a reservoir interval in a subterranean formation with the drilling apparatus such that the nanoparticles penetrate into the subterranean formation; and consolidating unconsolidated particles within the subterranean formation with the nanoparticles.