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1. 发明申请

US20040104068A1 Acoustic isolator for downhole applications 有权
标题翻译：用于井下应用的隔声器
公开(公告)号：US20040104068A1
公开(公告)日：2004-06-03
申请号：US10610940
申请日：2003-07-01
申请人： Baker Hughes Incorporated
发明人： Sergey Egerev , Vladimir Belov , Vladimir Dubinsky , Alexei Bolshakov , Victor Tiutekin , Victor Yushin
IPC分类号： G01V001/40
CPC分类号： G01V1/523
摘要： A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined frequency range. The mass irregularities may be rings secured to the inner surface of the collar by neck pieces, extending outwardly from the outer circumference of the ring. The mass irregularities may be made of steel or tungsten and are between six and ten in number. The spacing of the irregularities may lie between twelve and fourteen centimeters. A center pipe may be included to isolate the irregularities from the fluid flow associated with the drilling operation. The pipe may be of a soft material such as rubber to reduce transfer of acoustic noise along the drill string. The irregularities may be in an oil based fluid with the pipe fitting closely in the center of the rings. In another embodiment of the invention, each of the mass irregularities is attached to the drill collar over substantially the entire length of the mass irregularity, enabling the attenuation of high frequencies. In yet another embodiment of the invention, the attenuator comprises a substantially cylindrical body with a plurality of recesses on the inside and/or outside of the cylindrica body, with the length of the recesses selected to provide attenuation within a specified band. In another embodiment of the invention, the attenuator comprises a plurality of sections each having an inner diameter and an outer diameter, each section acting like a waveguide with an associated passband and reject-band.
摘要翻译：附接到钻铤的内壁的多个重质量不规则物减弱了穿过套环的波浪。多个重质量不规则部分被间隔开并确定尺寸，用于预定频率范围内的声脉冲的最大衰减。质量凹凸可以是通过颈部从环的外圆周向外延伸的固定到套环内表面的环。质量不匀度可以由钢或钨制成，数量在六到十之间。不规则的间距可以在十二到十四厘米之间。可以包括中心管以将不规则物与与钻井操作相关联的流体流动隔离。管道可以是诸如橡胶的软材料，以减少沿着钻柱的声学噪声传递。不规则形状可以在油基流体中，管道紧密配合在环的中心。在本发明的另一个实施例中，每个质量不规则物在质量不规则的基本上整个长度上附接到钻铤，使得能够衰减高频。在本发明的另一个实施例中，衰减器包括在圆柱体的内部和/或外部具有多个凹槽的基本上圆柱形的主体，其中凹部的长度被选择以在特定的带内提供衰减。在本发明的另一个实施例中，衰减器包括多个部分，每个部分具有内径和外径，每个部分的作用类似于具有相关联的通带和拒绝带的波导。

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