the use of multilateral well is becoming an emerging method to improve oil recovery efficiently and to drain reservoirs more efficacious. by developing drilling technology, completing the oil wells as multilateral wells become more interesting especially from economic point of view. on the other hand, lack of any means for forecasting the performance of this type of wells causes drilling of the...

a r t i c l e i n f o The use of high-volume horizontal hydraulic fracturing (fracking) has increased substantially over the past five years in the United States. Use of this drilling technology to extract natural gas from hitherto impermeable shale is expected to increase even more in coming decades. Two institutions, integration contracts and well spacing requirements, evolved to mitigate the...

About 90% of the world’s natural gas hydrates (NGH) exist in deep-sea formations, a new energy source with great potential for exploitation. There is distance from threshold commercial exploitation based on single well currently used. The complex structure an efficient and advanced drilling technology. improvement NGH productivity through various wells unclear, there no more complete combing. T...

Horizontal wells are proven to be better producers because they can be extended for a long distance in the pay zone. Engineers have the technical means to forecast the well productivity for a given horizontal length. However, experiences have shown that the actual production rate is often significantly less than that of forecasted. It is a difficult task, if not impossible to identify the real ...

ENGLISH/ANGLAIS] Affiliations: Department of Mechanical Engineering, University of Nigeria, Nsukka, NIGERIA Address for Correspondence/ Adresse pour la Correspondanc e: ekeochaj@yahoo. com Accepted/Accepté : December, 2013 Citation: Ekeocha RJO. Monte Carlo Simulation of Bottomhole Coordinates in Directional Drilling. World Journal of Engineering and Pure and Applied Sciences 2013;3(1): Increas...

This paper details the online-identification-based adaptive design of a stick/slip minimization algorithm and top-drive servo control for Rotary Steerable System (RSS) directional drilling tools. Stick/slip in this context refers to the downhole angular velocity variation of the bit about a nominal value. The basic pole placement controller designs are SISO linear but recursively evaluated base...

Directional mode coupling in an asymmetric holey fiber coupler is demonstrated both numerically and experimentally for the first time. The holey fiber mode couplers have interesting spectral characteristics and are also found to exhibit increased dimensional tolerances. Following a design based on numerical investigations, a dual-core polymer holey fiber coupler for LP(01) and LP(11) mode multi...

Bent-housing motor is the most widely used directional drilling tool, but it often encounters problem of high friction when sliding in horizontal wells. In this paper, a mathematical model proposed to simulate slide with reduction tool axial vibration. A term called dynamic effective tractoring force (DETF) defined and evaluate effectiveness. The factors influencing DETF are studied, placement ...

In directional drilling, the most important thing that leads to pulling out the drill string is end of mud motor working life. Considering the working conditions of down hole mud motors; increasing the mechanical properties of their stator’s elastomer is crucial. Some attempts were done to increase the motor performance through geometrical changes but lack of material improvement is significant...

underbalanced drilling as multiphase flow is done in oil drilling operation in low pressure reservoir or highly depleted mature reservoir. correct determination of the pressure loss of three phase fluids in drilling annulus is essential in determination of hydraulic horsepower requirements during drilling operations. in this paper the pressure loss of solid-gas-liquid three-phase fluids flow in...