Nanometer Self-Locking Bentonite Film for High-Temperature Shale Stability
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Solution Overview
Problem
Current methods for preventing shale collapse during drilling, such as inhibiting hydration and blocking water transmission, face challenges like high manufacturing costs, ineffective penetration of inhibitors into shale reservoirs, and inability to form stable films at high temperatures, leading to wellbore and reservoir instability.
Innovation Solution
A nanometer self-locking bentonite film-forming agent is developed through chemical slicing of nano-bentonite, followed by treatment with sodium chloride and a long-chain polymer, and subsequent crosslinking reactions to create a thermally responsive, impermeable film that can effectively isolate shale pores and resist high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inhibitors are used to suppress bentonite hydration, then surface hydration is inhibited, but the inhibitor cannot penetrate into the reservoir to bind with clay particles inside
Solution Approach 1:
The bentonite particles are segmented into nanometer-scale particles through chemical slicing methods. This segmentation increases the surface area and reduces particle size to enable deep penetration into the reservoir while maintaining inhibition effectiveness. The nanometer-sized particles can access and bind with clay particles throughout the reservoir formation.
Solution Approach 2:
The particle size parameter of bentonite is changed from micrometer scale to nanometer scale. This parameter change fundamentally alters the penetration ability while maintaining the inhibition function. The nanometer scale particles can penetrate deep into the reservoir and reach clay particles that conventional larger particles cannot access.
2Reliability
If blocking agents are used to fill shale pore channels, then water transmission is blocked, but the agents take time to stack and allow water penetration before forming a complete barrier
Solution Approach 1:
The bentonite particles are pre-modified with hydrophobic groups and crosslinked structures before being introduced to the reservoir. This preliminary action creates particles that can rapidly self-assemble into a blocking barrier upon contact with water, eliminating the time delay associated with stacking and forming a complete water barrier.
Solution Approach 2:
The bentonite particles are transformed into composite structures with hydrophobic modifications and crosslinked networks. These composite particles combine the blocking ability of bentonite with the rapid response characteristics of hydrophobic materials, enabling immediate barrier formation upon water contact.
3Reliability
If film-forming agents are used to isolate shale pores, then water blocking is achieved, but existing agents fail to maintain film stability at high temperatures
Solution Approach 1:
The thermal stability parameter of the film-forming agent is improved through crosslinking modifications. The crosslinked network structure raises the decomposition temperature and enhances thermal resistance, allowing the film to maintain its integrity and blocking function at high temperatures encountered during reservoir drilling operations.
Solution Approach 2:
The bentonite particles are transformed into composite structures with hydrophobic modifications and crosslinked networks. These composite particles combine the blocking ability of bentonite with the thermal stability of crosslinked polymers, enabling immediate barrier formation upon water contact.
4Reliability
If graphene is used as a film-forming material, then strong film-forming and anti-collapse properties are achieved, but the cost becomes prohibitive
Solution Approach 1:
The patent replaces expensive graphene materials with cost-effective bentonite particles that are modified through chemical treatments. The bentonite particles, after hydrophobic modification and crosslinking, can achieve comparable anti-collapse performance at a fraction of the cost of graphene-based solutions.
Solution Approach 2:
The material composition parameter is changed from graphene to modified bentonite. This parameter change maintains the essential film-forming and anti-collapse functions while dramatically reducing the manufacturing cost, making the solution economically viable for large-scale 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 nanometer self-locking bentonite film-forming agent forms a dense, self-locking membrane structure that significantly extends pressure transfer time, reduces permeability, and enhances shale stability, ensuring safe drilling operations even at high temperatures, with excellent anti-collapse performance and cost-effectiveness.
Implementation Method 1
By rapidly forming a film on the shale surface and its internal pores, the isolative extima and intima are rapidly formed at the shale interface and inside the shale through intermolecular interactions and specific layer-membrane structure
Implementation Method 2
so as to fulfill the purpose of completely hydrophobic and blocking water, thereby effectively suppressing the development of micro-cracks within the shale
Data Source
AI summary
The present application discloses a nanometer self-locking bentonite film-forming agent, a method for preparing the same, and a film-forming drilling fluid.