The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

V. Morozov - One of the best experts on this subject based on the ideXlab platform.

  • Development of Mathematical Model for Controlling Drilling Parameters with Screw Downhole Motor
    International Journal of Engineering, 2020
    Co-Authors: Mikhail Dvoynikov, A.a. Kunshin, P. A. Blinov, V. Morozov
    Abstract:

    Present article results of study on possibility of increasing the efficiency of drilling directional straight sections of wells using screw Downhole Motors (SDM) with a combined method of drilling with rotation of drilling string (DS). Goal is to ensure steady-state operation of SDM with simultaneous rotation of DS by reducing the amplitude of oscillations with adjusting the parameters of drilling mode on the basis of mathematical modeling for SDM – DS system. Results of experimental study on determination of extreme distribution of lateral and axial oscillations of SDM frame depending on geometrical parameters of gerotor mechanism and modes ensuring stable operation are presented. Approaches to develop a mathematical model and methodology are conceptually outlined that allow determining the range of self-oscillations for SDM – DS system and boundaries of rotational and translational wave perturbations for a heterogeneous rod with an installed SDM at drilling directional straight sections of well. This mathematical model of SDM – DS system's dynamics makes it possible to predict optimal parameters of directional drilling mode that ensure stable operation of borehole assembly.

Mikhail Dvoynikov - One of the best experts on this subject based on the ideXlab platform.

  • Development of Mathematical Model for Controlling Drilling Parameters with Screw Downhole Motor
    International Journal of Engineering, 2020
    Co-Authors: Mikhail Dvoynikov, A.a. Kunshin, P. A. Blinov, V. Morozov
    Abstract:

    Present article results of study on possibility of increasing the efficiency of drilling directional straight sections of wells using screw Downhole Motors (SDM) with a combined method of drilling with rotation of drilling string (DS). Goal is to ensure steady-state operation of SDM with simultaneous rotation of DS by reducing the amplitude of oscillations with adjusting the parameters of drilling mode on the basis of mathematical modeling for SDM – DS system. Results of experimental study on determination of extreme distribution of lateral and axial oscillations of SDM frame depending on geometrical parameters of gerotor mechanism and modes ensuring stable operation are presented. Approaches to develop a mathematical model and methodology are conceptually outlined that allow determining the range of self-oscillations for SDM – DS system and boundaries of rotational and translational wave perturbations for a heterogeneous rod with an installed SDM at drilling directional straight sections of well. This mathematical model of SDM – DS system's dynamics makes it possible to predict optimal parameters of directional drilling mode that ensure stable operation of borehole assembly.

Hai Zhang - One of the best experts on this subject based on the ideXlab platform.

H Wang - One of the best experts on this subject based on the ideXlab platform.

  • feasibility analysis of coiled tubing drilling with supercritical carbon dioxide
    Petroleum Exploration and Development, 2010
    Co-Authors: Z Shen, H Wang, Gensheng Li
    Abstract:

    Abstract Supercritical CO2 (SC-CO2) fluid has the properties of low viscosity and high diffusion capacity near to gas, and higher density near to liquid. Compared with nitrogen, air, liquid, aerated fluid, foam and other drilling fluids, the supercritical CO2 fluid has a wide range of density which can not only allow it to generate enough torque to run a Downhole Motor, but also ensure the Downhole condition is in an underbalanced state while drilling. Even if the supercritical CO2 fluid invades into reservoir, the reservoir will not be damaged, on the contrary, it can increase the reservoir porosity and permeability further more, reduce flow resistance, and enhance production and recovery. Meanwhile, the velocity of a supercritical CO2 jet is faster than that of water jet and the threshold pressure is lower also resulting in improved rock breaking. When the coiled tubing drilling with supercritical CO2 takes place, it can significantly decrease the coiled tubing drilling system pressure and expand the coiled tubing operating range, it is more suitable for slim hole, microhole, short radius horizontal wells, and complex structures wells. The coiled tubing drilling with SC-CO2 will bring an innovation in the drilling technology, and will become an efficient drilling technique for special reservoir development.

  • Feasibility analysis of coiled tubing drilling with supercritical carbon dioxide
    KeAi Communications Co. Ltd., 2010
    Co-Authors: Z Shen, H Wang
    Abstract:

    Supercritical CO2 (SC-CO2) fluid has the properties of low viscosity and high diffusion capacity near to gas, and higher density near to liquid. Compared with nitrogen, air, liquid, aerated fluid, foam and other drilling fluids, the supercritical CO2 fluid has a wide range of density which can not only allow it to generate enough torque to run a Downhole Motor, but also ensure the Downhole condition is in an underbalanced state while drilling. Even if the supercritical CO2 fluid invades into reservoir, the reservoir will not be damaged, on the contrary, it can increase the reservoir porosity and permeability further more, reduce flow resistance, and enhance production and recovery. Meanwhile, the velocity of a supercritical CO2 jet is faster than that of water jet and the threshold pressure is lower also resulting in improved rock breaking. When the coiled tubing drilling with supercritical CO2 takes place, it can significantly decrease the coiled tubing drilling system pressure and expand the coiled tubing operating range, it is more suitable for slim hole, microhole, short radius horizontal wells, and complex structures wells. The coiled tubing drilling with SC-CO2 will bring an innovation in the drilling technology, and will become an efficient drilling technique for special reservoir development. 摘要: ： 超临界CO2流体具有接近于气体的低黏度和高扩散系数，同时具有接近于液体的高密度。与氮气、空气、液体、充气液、泡沫等钻井流体相比，超临界CO2流体的密度变化范围较宽，这一特性使得超临界CO2为井下马达提供足够扭矩的同时，还能保证井底的欠平衡状态。即使超临界CO2流体侵入储集层，也不会对其造成伤害，相反还能进一步增大储集层孔隙度和渗透率，降低流动阻力，提高采收率。同时超临界CO2射流破岩速度较水射流快得多，而且破岩门限压力也非常低，在利用连续油管进行超临界CO2喷射钻井时，可大大降低连续油管钻井系统的压力，扩大连续油管的作业范围，更适合小井眼、微小井眼、超短半径水平井、复杂结构井等钻井。超临界CO2连续油管钻井将为钻井带来一次全新的技术创新，也将成为特殊油气藏开发的高效钻井技术。图10表1参15 Key words: coiled tubing, drilling, supercritical carbon dioxide, feasibility analysi

Aladwani, Faisal Abdullah - One of the best experts on this subject based on the ideXlab platform.

  • Mechanistic modeling of an underbalanced drilling operation utilizing supercritical carbon dioxide
    LSU Digital Commons, 2007
    Co-Authors: Aladwani, Faisal Abdullah
    Abstract:

    Mechanistic modeling of an underbalanced drilling operation using carbon dioxide has been developed in this research. The use of carbon dioxide in an underbalanced drilling operation eliminates some of the operational difficulties that arises with gaseous drilling fluids, such as generating enough torque to run a Downhole Motor. The unique properties of CO2, both inside the drill pipe and in the annulus are shown in terms of optimizing the drilling operation by achieving a low bottomhole pressure window. Typically CO2 becomes supercritical inside the drill pipe at this high density; it will generate enough torque to run a Downhole Motor. As the fluid exits the drill bit it will vaporize and become a gas, hence achieving the required low density that may be required for underbalanced drilling. The latest CO2 equation of state to calculate the required thermodynamic fluid properties is used. In addition, a heat transfer model taking into account varying properties of both pressure and temperature has been developed. A marching algorithm procedure is developed to calculate the circulating fluid pressure and temperature, taking into account the varying parameters. Both single phase CO2 and a mixture of CO2 and water have been studied to show the effect of produced water on corrosion rates. The model also is capable of handling different drill pipe and annular geometries