The number of deep wells and ultra-deep wells drilled worldwide is gradually increasing,
and the problem of deep well leakage has become one of the challenges in drilling. The …

The ever-increasing targets of drilling depth and reach, coupled with locational
disadvantages have driven the oilfield drilling operations into new technology frontiers …

The stability of plugging zone has a great impact on the lost circulation control effect in
fractured reservoirs. In this work, the multiscale structure of plugging zone is described …

Hydraulic fracturing with temporary plugging agents is one of the most promising
technologies to improve the thermal efficiency of deep geothermal reservoirs …

Drilling fluids Invasion and mud filtration is a complex process that is influenced by several
variables, and has NPT (Non-Productive Time) implications. Most of these variables are …

Drilling fluids have evolved from humble beginnings into advanced technology responsible
for many critical functions in well construction. Essential functions such as formation …

Solid particle size distribution (PSD) of drilling fluids is one of the key factors for the
formation damage and lost circulation control. However, particle size degradation occurs …

This paper presents a new criterion for selecting the particle size distribution (PSD) of
granular lost circulation materials (LCMs) in naturally fractured reservoirs. A comprehensive …

During drilling operation in gas shales, the high capillary force leads to drilling fluid filtration
continuously, which eventually results in severe wellbore instability, reservoir damage, and …

Well leakage of fractured strata is a tricky problem while drilling. This unwieldy problem is
usually caused by the poor formation of the cementing degree, the staggered-mesh of the …