- 122 articles

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.

Ordinary World, set against the backdrop of a period of social transformation, deeply integrates traditional culture into its character construction. In rural society, hierarchical rules govern interpersonal relationships; mutual assistance among the Sun family and their neighbors highlights the characteristics of rural culture. Marital and romantic ethics reveal the profo... Read more.

Homology of medicine and food” embodies the Chinese nation’s unique wisdom, integrating nutritional and therapeutic functions to form a health philosophy centered on prevention, nourishment, and syndrome-based diet therapy. From the legend of Shennong to The Yellow Emperor’s Inner Canon, Sun Simiao’s Prescriptions , Li Shizhen’s Compendium, and modern scient... Read more.