Modified Nanographene Plugging Drilling Fluid for Basalt Borehole Stability
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Solution Overview
Problem
Existing drilling fluids have poor plugging effectiveness on microfracture pores in basalt formations, leading to borehole instability and collapse, due to inadequate particle size matching and toxicity concerns.
Innovation Solution
A fully adaptive modified nanographene plugging type anti-collapse drilling fluid is developed, prepared by modifying nanographene with a mixed acid and potassium chlorate, then combining it with micron plugging agents and weighting agents to create a comprehensive plugging system that effectively fills micro-nano pores and cracks in basalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing nanometer material is used for plugging, then the particle size is small enough to enter micro-fractures, but the dispersion and stability are insufficient to satisfy plugging requirements
Solution Approach 1:
The patent applies parameter changes by modifying the surface properties of nanographene through chemical treatment with potassium chlorate and ice-bath conditions. This modification changes the physical and chemical parameters of the nanometer material, improving its dispersion and stability in the drilling fluid while maintaining its small particle size for effective plugging of micro-fractures.
Solution Approach 2:
The patent uses composite materials by combining modified nanographene with other plugging materials of different particle sizes. This creates a multi-size distribution system where nanometer, micrometer, and millimeter particles work together, with the modified nanographene providing stability and the larger particles providing structural support for comprehensive plugging.
2Reliability
If conventional plugging materials are used, then the particle size can match micro-fractures, but the plugging capability is insufficient due to poor dispersion
Solution Approach 1:
The patent changes the chemical parameters of the plugging materials by modifying nanographene with potassium chlorate under ice-bath conditions. This chemical modification improves the surface properties and dispersion characteristics, enabling the materials to maintain stable suspension and achieve reliable plugging capability in the drilling fluid system.
Solution Approach 2:
The patent segments the plugging function into multiple particle size categories (nanometer, micrometer, and millimeter particles). Each segment targets different scales of fractures and pores, with the modified nanographene addressing nanometer-scale micro-fractures while larger particles handle larger defects, collectively achieving comprehensive plugging.
3Reliability
If inhibitors are added to prevent borehole wall collapse, then hydration and swelling are controlled, but the drilling fluid system changes density and rheology, influencing drilling rate
Solution Approach 1:
The patent extracts the plugging function from chemical inhibitors and transfers it to solid plugging particles. Instead of using chemical inhibitors that alter the drilling fluid's density and rheology, the patent uses physically active plugging particles (modified nanographene and other materials) that mechanically block micro-fractures without significantly affecting the fluid properties, thereby maintaining drilling rate while ensuring borehole stability.
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 modified nanographene drilling fluid provides high plugging capability, environmental friendliness, and strong suspension stability, preventing borehole instability and collapse by effectively plugging micro-nano fractures and enhancing pressure bearing capacity.
Implementation Method 1
The mechanism of borehole instability is mechanical instability, requiring a strong plugging capability of the drilling fluid and increasing the pressure bearing capacity of the whole wellbore according to the 'stress cage' theory, thereby preventing the drilling process from fall-block, borehole collapse and other problem.
Implementation Method 2
increasing the pressure bearing capacity of the whole wellbore according to the 'stress cage' theory
Data Source
AI summary
A preparation method of a fully adaptive modified nanographene plugging type anti-collapse drilling fluid is disclosed. A modified nanographene slurry anti-collapse agent and a water-based drilling fluid containing the modified nanographene slurry anti-collapse agent are disclosed. The preparation method includes subjecting a nanographene and a mixed acid to a first contact to obtain a mixed liquid, dropwise adding potassium chlorate into the mixed liquid under the condition of ice-bath pan to carry out a modification treatment, so as to obtain a modified nanographene, and subjecting the modified nanographene to a second contact with water to prepare a modified nanographene slurry.