Cascading type ground receiving and displaying system of underground acoustic signals
A technology of acoustic signal and ground reception, which is applied in wellbore/well components, measurement, earthwork drilling and production, etc. It can solve problems such as formation dependence, affecting normal drilling, and downhole noise interference, so as to avoid the energy attenuation of acoustic signal and error code, strong anti-wellhead noise interference ability, and strong anti-noise ability
Pending Publication Date: 2017-07-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0004] (1) Wired transmission: Although it can realize fast and large-scale transmission of downhole information, the rotation of the drill string during the drilling process will easily cause the transmission cable to be worn or twisted, affecting normal drilling
[0005] (2) Drilling fluid pulse transmission: The pressure wave of drilling fluid is used as the transmission carrier, which has a strong dependence on drilling fluid, and has disadvantages such as slow transmission rate, susceptibility to downhole noise interference, and inability to realize two-way information transmission.
[0006] (3) Electromagnetic wave transmission: Although it gets rid of the dependence on drilling fluid and can realize two-way transmission of downhole information, it has the disadvantages of dependence on the formation, large attenuation in the formation, poor versatility, and high cost.
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[0035] In the following, the present invention will be specifically described through exemplary embodiments. It should be understood, however, that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.
[0036] In the description of the present invention, it should be noted that the direction of the drill string in the well is figure 1 in the vertical direction; the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship based on figure 1 The positional relationship shown is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention . In addition, the terms "first" and "second" are used for des...
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The invention provides a cascading type ground receiving and displaying system of underground acoustic signals and belongs to the field of drilling engineering of petroleum and natural gas. Under the premise of normal circulation of drilling fluid and no change of the external size and the internal flow-channel structure of a drilling column, real-time accurate detection and recognition and fast decoding and display of the acoustic signals in a channel of the drilling column are realized. The cascading type ground receiving and displaying system comprises an acoustic-signal receiving and converting device arranged at the top part of the wellhead drilling column and a wireless-signal receiving and displaying device arranged on the surface of a drilling platform; and the acoustic-signal receiving and converting device comprises a signal decoding circuit, a signal converting circuit and a wireless-signal transmitting circuit which are connected in sequence, and also comprises an acoustic-signal receiving element connected with the signal decoding circuit.
Description
technical field [0001] The invention relates to the field of oil and natural gas drilling engineering, relates to a drilling-while-drilling information transmission system, in particular to a serially connected downhole acoustic signal ground receiving and displaying system. Background technique [0002] According to the current geological conditions and natural environmental conditions encountered in the exploitation of oil and gas resources in the world, the future oil drilling industry will encounter severe challenges of more complex geological conditions and harsher natural environments. Therefore, the downhole process monitoring of oil and gas drilling has put forward higher requirements. requirements. [0003] The high-speed transmission and effective acquisition of downhole information is the key to accurate monitoring of downhole processes and the key technology to achieve fast and high-quality drilling. The downhole information transmission methods that have been p...
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IPC IPC(8): E21B47/16
CPCE21B47/16
Inventor 刘永旺管志川王庆李坤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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