Fracture Simulation Cell for Drilling Fluid Testing
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Solution Overview
Problem
Drilling operations face challenges with 'Lost Circulation' due to fluid loss in porous and fractured formations, where existing methods to control fluid loss are inefficient and damage formation production capabilities.
Innovation Solution
A Fracture Simulation Cell (FSC) is developed to simulate borehole fractures, allowing for the testing of drilling fluids and materials by adjusting the gap between disks to mimic formation resistance and stiffness, enabling the evaluation of Lost Circulation Materials (LCM) and Wellbore Strengthening Materials (WSM) effectiveness in preventing fluid loss and maintaining fracture openness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If LCM materials are added to drilling fluid to seal pores and prevent lost circulation, then fluid loss is reduced, but formation production capabilities are damaged
Solution Approach 1:
The patent creates a physical model (copy) of the fractured formation using transparent materials and simulated fracture networks. This model allows researchers to study lost circulation mechanisms and material performance without directly testing in actual formations, thereby avoiding formation damage while gathering necessary data for selecting appropriate LCM materials
Solution Approach 2:
The patent replaces complex in-situ formation mechanics with a controlled physical model system. By using transparent acrylic blocks with embedded fracture networks and controlled fluid injection, the system substitutes the natural geological mechanical environment with a reproducible experimental setup that eliminates formation damage risks
2Loss of substance
If WSM materials are used to strengthen wellbore walls and prevent fracturing, then lost circulation is reduced, but drilling operation complexity increases
Solution Approach 1:
The patent applies WSM materials to the wellbore wall before fracturing occurs during drilling operations. The physical model demonstrates that pre-coating the formation with WSM creates a strengthened zone that prevents fracture initiation and propagation, eliminating the need for complex real-time monitoring and intervention systems
Solution Approach 2:
The patent evaluates how WSM materials dynamically interact with drilling fluids and formation stresses under varying pressure and flow conditions. The physical model allows adjustment of fluid pressure, flow rate, and material concentration to optimize WSM performance across different drilling scenarios, simplifying material selection through comprehensive laboratory testing
3Strength
If drilling fluid pressure is increased to maintain wellbore stability, then formation support is improved, but fracture initiation and lost circulation increase
Solution Approach 1:
The patent implements a feedback mechanism in the physical model where fluid pressure, flow rate, and LCM/WSM concentration are continuously monitored and adjusted. Pressure sensors detect fracture initiation points, and the system automatically modulates fluid injection parameters to maintain wellbore stability while preventing lost circulation, providing a template for closed-loop control in actual drilling 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 FSC effectively simulates subterranean conditions to assess the sealing efficiency and long-term stability of LCM/WSM, optimizing drilling operations by identifying suitable materials and improving wellbore integrity, thereby reducing drilling costs and enhancing formation production.
Implementation Method 1
high pressure fluid flow causes movement of the movable disk away from the fixed disk
Implementation Method 2
a pair of springs positioned on opposite sides of the movable disk and biased against the movable disk to hold the movable disk against the fixed disk
Data Source
Figure 1~4
Figure 2
Figure 3
AI summary
Apparatus and methods for simulation of bore hole fractures are disclosed. A device (100) for simulating a fracture in a subterranean formation comprises a housing (110), an inlet (102) for directing a sample fluid to the housing (110), and a first disk (202A) and a second disk (202B) positioned within the housing (110). The second disk (202B) is movable relative to the first disk (202A) to form an adjustable gap (302) between the first disk (202A) and the second disk (202B) and the sample fluid flows through the adjustable gap (302). A common collector (216) receives at least a portion of the sample fluid that flows through at least one of the first disk (202A) and the second disk (202B). The apparatus and methods are particularly suitable for testing drilling fluids, lost circulation materials or wellbore strengthening materials. The disks can be porous disk, slotted disk or solid disks in order to represent different types of subterranean formation such as sandstones or shale.