Hole cleaning for the majority of vertical and directional drilling wells continues to be a substantial difficulty despite improvements in fluids, equipment, field techniques, academic industrial research. Poor hole might cause issues such as stuck pipe incidents, cuttings accumulation, torque drag, erratic equivalent circulating density annulus, wellbore instability, tight spots, condition iss...

The mechanical properties of hydrate-bearing strata in clayey-silt sediments are significantly different from those either conventional reservoirs or sandy sediments, which poses great challenges for wellbore stability analyses. characteristics a deviated borehole during drilling (HBS-CS) remain to be studied. In this paper, an analysis the using Mohr–Coulomb (M-C) criterion and Drucker–Prager ...

Abstract In this study, super-amphiphobic nano-silica nanoparticles (SA-NPs) were used to enhance the shale stabilization performance of water-based drilling fluids (WBDFs) by altering surface wettability, preventing capillary self-priming effect, and plugging nano-micro pores shale. The results transmission electron microscopy, particle size distribution, scanning microscopy characterization r...

A mathematical model has been developed to predict the temperature distribution in wellbores either offshore or inshore. It is incorporated the different activities encountered during drilling operations. Furthermore, the effect of drill collar and casings and bit rotating in a well during completion has been considered. The two dimensional approach is presented in the form of a computer progra...

The use of multilateral wells is an important method to effectively develop complex oil reservoirs, and wellbore stability research great importance. In the present study, effects formation fluids rock damage were not taken into account by model. Therefore, finite element analysis (FEA) software was used establish a three-dimensional (3D) seepage-stress FEA model for junctions. analyze study in...

In the process of drilling, drilling fluid will invade into bedding plane shale under action pressure difference that cause hydration collapse and wellbore instability. order to ensure stability during oil gas it is necessary clarify invasion law along fractures process. The immersion experiment method often used study fluid, which quite different from actual underground. this paper, depth conf...

The casing deformation problems are presented over 36 wells (among 112 horizontal wells by 2016) during fracturing processes in Weiyuan-Changning shale gas play in China.1 Subsequent tools could be blocked in the wellbore.2–4 The segments with serious deformation had to be abandoned before completing fracturing operations.5 The casing deformation issues make a great influence on production of s...