Review of Research Status and Development Trends of Subsurface Safety Valve Technology

Subsurface safety valves (SSSVs) are critical components of wellbore integrity systems and serve as essential downhole safety barriers for oil and gas production. By rapidly shutting off the production conduit under abnormal conditions, such as wellhead failure, blowouts, or uncontrolled formation fluid flow, SSSVs effectively prevent major safety accidents and enviro... Read more.

Objectives The Dengying Formation gas reservoirs in the Sichuan Basin are characterized by great burial depth, multiple superimposed pressure systems and strong reservoir heterogeneity. During drilling, risks such as the coexistence of kick and lost circulation, borehole collapse and pipe sticking, high temperature and high pressure (HTHP), and sour-gas well control ... Read more.

Additive manufacturing (AM) has evolved from a rapid prototyping technology into an advanced design and manufacturing approach that enables new possibilities in engineering product development. Unlike conventional manufacturing methods, AM provides unprecedented design freedom by allowing the fabrication of complex geometries, lightweight structures, customized products, ... Read more.

The Sichuan Basin contains multiple hydrocarbon-bearing formations, and oil and gas development in the basin is challenged by complex subsurface conditions, including highly variable formation lithologies, diverse reservoir fluids, and irregular formation-pressure systems. During drilling operations, influxes of acid gas commonly contaminate drilling fluids. Acid-gas conta... Read more.

Core analytical data, including petrographic and epoxy-impregnated thin sections and scanning electron microscopy (SEM), were used to investigate in detail the mechanisms of pore development in the Lower Shihezi–Shanxi tight sandstone reservoirs of the Sulige Gas Field. The results show that the reservoir sandstones contain abundant lithic fragments and mineralogica... Read more.

In recent years, the proportion of low-permeability, low-pressure, and low-productivity oil and gas wells in China’s oilfields has been increasing year by year. As a key production mode for such wells, intermittent production plays an important role in stabilizing production, reducing energy consumption, and protecting reservoirs. However, the traditional manual intermitte... Read more.

Well completion is the process of creating an effective flow path between the reservoir and the wellbore. An effective completion must maintain the mechanical integrity of the wellbore while ensuring fluid flow within the well. This paper outlines a method for optimizing horizontal well design, using a skin factor mod... Read more.

Ultra-deep well drilling in the Zhebachang Structure and Suining-Santai Qixia Formation Slope Structural Belt of northwestern Sichuan is confronted with a harsh environment characterized by high temperature, high pressure, and high stress. The geological conditions are complex, variable, and difficult to pred... Read more.

Small leaks in pipeline systems, though less dramatic than major ruptures, pose significant long-term threats to safety, environmental health, and operational efficiency. Early detection is critical, and various online (real-time) detection techniques have been developed to address this challenge. This paper presents a comparative study of three major classes of online leak ... Read more.

With the continuous advancement of exploration and development technology, the complex geological conditions of natural gas resources are gradually being revealed. This article introduces the current situation of natural gas exploration and development, analyzes the important role of geological technology in natural gas exploration and development, and finally explores the de... Read more.

 The drilling industry continually seeks improvements in drill bit design to enhance efficiency and reduce costs, particularly in hard formations. This study investigates the optim... Read more.

The integration of robot technology in smart manufacturing has markedly transformed the industry, leveraging advancements in artificial intelligence (AI), machine learning (ML), and the Internet of Things (IoT). This paper explores the evolution of robotic technology, highlighting key milestones from early automation to the contemporary era of Industry 4.0. It revie... Read more.

The continuous improvement of lithium-ion battery (LIB) technology is critical to meet the growing demand for high-energy-density storage solutions in various applications. This paper reviews the latest advancements in the synthesis methods and properties of cathode precursor materials, focusing on high-nickel terna... Read more.

 This study investigates the predictive accuracy of different three-dimensional rock strength criteria. The research focuses on the comparison between ZZ criteria and HBWW criteria against the HB, PH, and GP criteria. The results demonstrate that the ZZ and H...... Read more.

This paper investigates the stability of stratified shale boreholes in the Longmaxi Formation of the Silurian system in the Sichuan Basin, with shale gas reservoirs ranging in thickness from 65m to 516m. Considering that borehole stability is a crucial factor in drilling operations, this study combines theoretical... Read more.

Rod pumping is commonly used in oilfield development. In recent years, with the development of oilfield development projects, the cost of oil extraction has significantly increased. Therefore, it is crucial to adopt measures to improve the efficiency of mechanical extraction in order to improve the efficiency of oilfi... Read more.

This paper aims to explore the challenges and opportunities of smart city development in European cities. Through an analysis of the concept of smart cities, their characteristics, and their applications in different European contexts, the importance of smart city development for sustainable urban development in Europe is elucidated. Moreover, the paper discusses the pote... Read more.

Marine oil pollution, stemming from human activities, poses severe threats to ecosystems and coastal areas globally. This study assesses and compares various marine oil cleanup technologies, examining their efficiency and environmental impacts. The overview covers mechanical methods (e.g., skimming, barriers) and chem... Read more.

The article delves into the impact of offshore drilling on marine ecosystems, focusing on environmental concerns arising from pollutants, drilling waste, and oil spills. It highlights threats to marine biodiversity, habitat disruptions, and water pollution. The study aims to deepen our understanding of the complex rel... Read more.

This study delves into the significant impact of marine oil spills on ecosystems, societies, and economies. Marine environments, critical for global biodiversity, face severe threats from incidents like oil spills, causing immediate environmental hazards and enduring implications for marine life, habitats, and human so... Read more.

This paper explores the integration of machine learning techniques in the context of Industry 4.0, aiming to enhance automation, optimize processes, and enable data-driven decision-making in industrial settings. It provides an overview of Industry 4.0, highlighting its evolution and transformative impact on manufacturing. The paper also examines various machine learning al... Read more.

This research provides a comprehensive analysis of the historical evolution and practical implementation of seismic-resistant architectural techniques in earthquake-prone regions, with a particular focus on Japan. Through detailed case studies and advanced simulations, the study rigorously evaluates the empirical effe... Read more.

This paper aims to delve into the integration of renewable energy systems with green building design. Initially, the fundamental principles and types of renewable energy technologies, including solar, wind, and hydro energy, are introduced. Subsequently, a comprehensive exploration of the theoretical foundations of gr... Read more.

The study was carried out to develop models for the reservation of funds for sustainable compensation of offshore oil and gas damage accidents economic loss in Nigeria. The objective was to develop models to enable marine underwriters overcome the challenges of financial insolvency in the compensation of insured offsh... Read more.

To study a kind of plugging material suitable for gas invasion in gas reservoirs fractured pressure plugging material. Gas invasion in carbonate gas reservoirs is frequent and will be accompanied by lost circulation and overflow, which will affect the safety and efficient production of oil and gas wells, and even cause serious safety hazards. In this regard, this paper summa... Read more.