In order to carry out a series of key basic researches, a scientific ultra-deep drilling plan is being undertaken in China. Wellbore temperature is one of the key factors during the drilling process. In this paper, we established a twodimensional transient numerical model to predict the ultra-deep wellbore temperature distributions during circulation and shut-in stages. The simulation results i...

A theoretical and experimental investigation of the effect of pressure on Mechanical Specific Energy and Cutting Efficiency was performed. The bottomhole expansion theory of Warren and Smith was verified and it was shown through finite element analysis that permeability of the formation restricts the use of this theory in many cases. Single cutter experimentations under pressure showed that the...

During oil and gas fields development, a decrease in reservoir bottomhole pressure has often detrimental effect on properties, especially permeability. This study presents the results of laboratory tests conducted to determine response terrigenous core-sample permeability changes effective stresses pressure. The considered samples were exposed for long time constant high stress more reliable as...

The current research of nonlinear seepage theory of shale-gas reservoir is still in its infancy. According to the characteristics of shale gas in adsorption-desorption, diffusion, slippage and seepage during accumulation, migration and production, a mathematical model of unstable seepage in dual-porosity sealed shale-gas reservoir was developed while considering Knudsen diffusion, slip-flow eff...

To ensure safe and stable drilling operation, bottom hole pressure (BHP) should be kept within some region. However measurement of the BHP is sometimes not available or reliable, especially when the circulation is low, e.g., during pipe connection procedures. This paper presents the application of a moving horizon estimation (MHE) method for online estimation of the BHP during petroleum drillin...

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...