会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 6. 发明公开
    • ACOUSTIC TELEMETRY
    • 声学遥测
    • EP1996794A1
    • 2008-12-03
    • EP07732062.0
    • 2007-03-20
    • Quinetiq Limited
    • DALTON, Roger, PatrickWATERS, MatthewJAMIESON, Ian, Andrew
    • E21B47/16
    • E21B47/16
    • A method of transmitting data acoustically through a tubular structure, such as a drill string or production tubing in an oil or gas well, predominantly comprising a series of tubing sections (1) joined end to end by couplings (2), at least a preponderance of the tubing sections having an axial length of at least a dimension X between couplings and at least a preponderance of the couplings having an axial length of no more than a dimension x, where X is substantially greater than x. The method comprises propagating acoustic signals along the structure, between transducers (9,10) over a distance N of at least 10X, in the form of tone bursts at least predominantly comprising a selected guided wave mode (preferably the L(0, 1) mode at low frequency) with a wavelength of at least 2x, and each burst having a temporal length of substantially less than 2N/C and preferably no more than 2X/C, where C is the phase velocity of the selected mode. In this way interference problems associated with Brillouin scattering in such structures can be overcome without excessive power consumption.
    • 9. 发明公开
    • FASCINES
    • EP1893815A1
    • 2008-03-05
    • EP06755594.6
    • 2006-06-22
    • QinetiQ Limited
    • CONNOR, Richard Charles
    • E01D15/12
    • E01D15/122
    • A fascine for filling ditches or smoothing other discontinuities in or on the ground to facilitate the passage of vehicles across the discontinuity is composed of inflatable members 1 wrapped with one or more fabric sheets (3) extending back along the ground from the respective discontinuity in the path of oncoming vehicles (5). The overwrapping sheet(s) assist in maintaining the integrity of the fascine and provide an improved surface particularly for wheeled vehicles to cross the fascine, obviating the risk of wheels falling into gaps between individual fascine members.
    • 用于填充沟渠或平滑地面内或地面上的其他不连续部分以便于车辆穿过不连续部的通道由一个或多个织物片(3)包裹的可充气构件1组成,所述织物片(3)沿着地面从 迎面驶来的车辆的路径(5)。 外包装薄片有助于保持座架的完整性并提供改进的表面,特别是用于轮式车辆穿过座架,避免车轮落入各座座座架之间的间隙中的风险。