... ABSTRACT Stuck pipe in the drilling can increase the non-productive time and lead to drilling risks such as buried tool and drilling tool fracture. Due to complex sequential feature analysis and the lag of downhole data transmission, traditional methods which are mostly used for post-drilling...

... the development of the fluid flow model, also known as the pipe network flow model, that arranges the pore throat structure in PFC2D. Note that, apart from the fixed-grain con- dition, we simplify the present work with the following assumptions: Gravity and inertia are ignored since we only study the 2D...

... ABSTRACT The filling and drainage process of high-pressure bifurcated reinforced concrete pipes in pumped storage power stations (PSPS) can significantly affect the propagation of cracks in the reinforced concrete lining, which in turn impacts the structural safety and long-term stress state...

...-dependent failures can occur in the vicinity of the borehole depending on the magnitude of the tripping velocity. INTRODUCTION Tripping is a frequent operation that is running pipes into or out of a well for different reasons, e.g., replacing a dull bit, replacing bottom hole assembly, running logging...

... ABSTRACT: In the drilling process of extended-reach wells in the eastern South China Sea, the problem of regular pipe sticking is quite prominent. In order to effectively control it, this paper studies the mechanism of regular pipe sticking. It is thought that there are two main reasons: (1...

..., and problems such as high friction torque, frequent backing pressure, and buckling of pipe strings are more serious. Due to its own motion and downhole loads, drill strings often fail prematurely, which seriously affects the service life of the drill pipe and brings great risks and serious challenges...

... to collapse, which causes the instability of the wellbore(Guimei, Liangjie, Wenzheng, & Yixin, 2007). The main reason is that the interface between the gypsum layer, the salt layer and the mudstone has the greatest risk of instability, which is likely to cause stuck pipe accidents, which is a thorny...

... upstream oil & gas experiment vortex pipe directional drilling entrance cfd modeling drilling fluids and materials rotation simulation drilling operation q-criterion characteristic effect symposium cylinder diameter variation schematic diagram magnitude china university...

..., the slotted liners have to be strong enough to hold axial loads and radial compression to prevent excessive buckling and deformation of slots. Experiments were designed to select the grades of materials, diameter/thickness of pipes, slot pattern. Finite element models were developed to decide the slotted...

... fluid density critical point fracture pressure drilling operation pipe horizontal section annular pressure loss discharge overflow extended-reach limit horizontal-section limit horizontal ERW horizontal drilling Drilling 1. INTRODUCTION The extended-reach well (ERW) plays a more and more...

... is influenced by hole cleaning. In this technique, most cuttings are translated in micro annulus which is between drill pipe and coiled tubing. Moreover, the micro annulus where the drill pipe rotates and coiled tubing is static is different from normal annulus which is between borehole and drill pipe...

... drilling fluids and materials borehole erosion erodibility Wellbore Design resistance erosion rate different flow rate erosion test instability erosion shear stress stream tube pipe turbulent flow equation 1. INTRODUCTION Borehole instability is a condition where the drilled section loses...

... provide sufficient support for tunnels, using pre-reinforcement systems becomes necessary in addition to main support systems. Pre-reinforcement of weak ground is done before the excavation or ahead of advancing the tunnel. This will provide a safe and effective operation. Pipe roofing umbrella arch pre...

..., abandoned in the cavern permanently. model test water hammer dynamic characteristic preliminary investigation cavern pipe solution mining vibration Upstream Oil & Gas rubber hose cantilever tube salt cavern deformation natural gas storage experiment chaotic motion flow velocity...

... Abstract: Wellbore instability problems are the cause for the majority of nonproductive time in the southern Iraqi field developments. These drilling difficulties pose potential problems such as mud losses in weak or vugular formations, stuck pipe in shales or unconsolidated formations...

... Abstract The pipe roofing method is one of the widely used excavation support techniques for conventional tunneling. It is to install steel (or fiber glass) pipes in a canopy shape around the area to be excavated and then to excavate the soils under the protection of the pipe roof. This paper...

... porosity permeability upstream oil & gas mechanical property wellbore design wellbore cement cement chemistry cement casing and cementing cement sheath cement property composite sample reduction hardness pipe expansion fixture assembly wellbore integrity compaction...

... is the analysis of the pressurization on the annulus above top of cement, which can lead to casing system collapse due to trapped drilling mud. bulk modulus taquihydryte wellbore closure finite element analysis simulation configuration pipe collapse pressure mpa salt creep cavity wellbore...

... of a steel pipe buried in the specimen. After the tests, we excavate the specimen bit by bit and observe how the fracturing fluid has invaded into the specimen. In the present study, to examine the effect of pore water on the fracture formation, we carried out the tests for the specimens under various...

... production control production logging Reservoir Surveillance fracturing fluid Upstream Oil & Gas proppant hydro-thermo-mechanical fracture propagation pipe BPM production monitoring hydraulic fracturing geothermal reservoir particle coefficient temperature change borehole temperature...