Device for testing transmission and attenuation characteristics of acoustic waves in drill-string channel
A test device and technology of attenuation characteristics, which are applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc., can solve problems such as downhole accidents, increase drilling operation costs, and affect drilling construction, etc., and achieve convenient production and strong practical performance , economical and practical effect
Active Publication Date: 2015-03-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
However, relying directly on field tests will affect normal drilling construction, increase the cost of drilling operations, and even cause downhole accidents.
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[0023] The present invention will be further described below in conjunction with accompanying drawing.
[0024] Such as figure 1 As shown, a test device for testing the transmission and attenuation characteristics of sound waves in the drill string channel, the device includes a sound wave emission system, a wellbore simulation system, a simulated drill string 19 and a drilling fluid circulation system; the sound wave emission system consists of transducers 37 and The arbitrary wave generator 32 is composed of the arbitrary wave generator 32, which is connected with the simulated drill string 19 through the transducer 37, and the arbitrary wave generator 32 can excite excitation signals of various waveforms such as sine wave and square wave for exciting the transducer Vibration is generated, and waves required by the simulated drill string 19 are emitted; the drilling fluid circulation system is connected with the simulated drill string 19 to complete the circulation of the dr...
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The invention relates to a device for testing transmission and attenuation characteristics of acoustic waves in a drill-string channel. The device comprises an acoustic wave transmitting system, a mineshaft simulation system, a simulation drill string and a drilling fluid circulating system, wherein the acoustic wave transmitting system consists of an energy converter and an arbitrary wave generator; the arbitrary wave generator is connected with the simulation drill string by the energy converter; and the drilling fluid circulating system is connected with the simulation drill string and is used for completing the circulation of drilling fluid in an annular cavity which consists of the mineshaft simulation system and the simulation drill string and the simulation drill string. According to the device, the circulation of the drilling fluid in the annular cavity and the drill string is realized by the drilling fluid circulating system, the components of the drill string are changed by changing the structure size of the simulation drill string, and waves of different waveforms, frequencies and amplitudes are transmitted by the arbitrary wave generator, so that the transmission and attenuation characteristics of acoustic waves with different properties in drilling assemblies which are in different states and have different structures under the circulating condition can be tested indoors.
Description
technical field [0001] The invention relates to the technical field of wireless measurement-while-drilling in oil and natural gas drilling operations, in particular to a test device for testing information carrier-acoustic wave propagation and attenuation characteristics in a drill string channel during the measurement-while-drilling process. Background technique [0002] With the continuous development of oil and gas drilling technology, people are eager to grasp the actual working conditions and related information downhole at any time. How to achieve high-speed, large-capacity, and two-way transmission of drilling information has always been a research hotspot in the field of drilling engineering. Among them, measurement-while-drilling technology came into being to meet this need. The measurement-while-drilling technology can be roughly divided into: wired while-drilling technology and wireless while-drilling technology. Due to the technical limitation that the wired wh...
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IPC IPC(8): E21B47/00
Inventor 管志川李志刚刘永旺赵国山杜彬彬
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)