Clausthal University of Technology

Machine Learning Modeling of Drill Cuttings Transport Based on Computational Fluid Dynamics Simulation Data

ABSTRACT Drill cuttings transport is a critical operation in drilling deep wells. Inefficient removal of cuttings can lead to both hydraulic and mechanical problems during drilling operations. High‐fidelity computational fluid dynamics (CFD) simulations provide detailed insight b...

Theory, technologies, and practice of oilfield-geothermal co-development in the Bohai Bay Basin

Abstract Driven by the global energy transition and China's dual-carbon goals, oil and gas field development faces challenges in achieving sustainable development. Oilfield-geothermal co-development (OGC) offers a pathway for revitalizing mature oilfields and supplying low-carbon...

Mechanisms of Water-Lock Removal by a Nanoemulsion/Mud Acid Composite System in Low-Permeability Sandstone Reservoirs: Insights from Pore-Scale Characterization in the MB Block

Abstract Water-lock damage in low-permeability sandstone reservoirs is primarily caused by small pore-throat structures, strong capillary forces, and hydrophilic rock surfaces. Conventional treatment methods mainly target either fluid-interface modification or pore blockage probl...

Influencing Factors and Mechanism of CO2 Trapping and Storage in Tight Sandstone Reservoirs Based on Fractal Characteristics of Pore Structure

To mitigate global warming induced by excessive carbon dioxide emissions, carbon dioxide displacement technology for carbon utilization and storage has attracted growing attention. In this paper, laboratory displacement experiments combined with Nuclear Magnetic Resonance (NMR),...

Capital theory and liberty – why they belong together

Abstract Historically, issues surrounding capital and interest have been tied to conflicts over exploitation, domination and the choice between capitalism and socialism. By contrast, modern growth and financial theory define capital as a homogeneous factor in a production functio...

Strong solution for polymeric fluid–structure interaction with small initial acceleration

Abstract We consider the problem of a 3D–3D–2D mutually coupled solute–solvent-structure three-states system. This describes the interaction of a flexible structure with a polymeric fluid of classical Oldroyd-B type without centre-of-mass diffusion. We construct a unique higher-o...

Lineal: An efficient linear algebra library

<title>Abstract</title> This paper introduces Lineal, a new C++20 linear algebra library designed to solve large sparse linear systems arising from PDE discretization on attainable hardware by optimizing runtime and especially memory consumption. Lineal supports matrix-free linea...

Redox‐Tuned Oxycarbamates Enable Divergent C─N and C─C Functionalization of Indolizines Under Photoredox Catalysis With Green Light

Nitrogen-centered radicals (NCRs) provide direct access to C─N bonds, but their broader use remains limited by the need for strongly reducing photocatalysts, high-energy irradiation, and incomplete control over competing radical transfer pathways. Here we show that nonafluoromesi...