The Method of Establishing FIR Theoretical Model of Acoustic Drill String Channel
A technology of acoustic drill string channel and theoretical model, applied in the field of acoustic wave remote transmission, can solve the problem that the acoustic channel cannot be fully studied in the laboratory
Inactive Publication Date: 2016-04-13
XI'AN PETROLEUM UNIVERSITY
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[0009] The invention provides an FIR simulation implementation of the acoustic drill string channel to overcome the problem that the drill string acoustic wave channel cannot be fully studied in the laboratory, and to provide an indispensable experimental platform for the research of the acoustic wave while drilling transmission instrument
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[0058] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0059] Step 1: First, establish the acoustic seamless transmission model of any single drilling tool: According to the known structural parameters of the drilling tool, the four system function characteristics of the S parameters of the dual-port network of the drilling tool are obtained according to formulas (1)-(5) ;
[0060] The formula is as follows:
[0061] (1)
[0062] in , k = w / c , called the wave number; w is the vibration frequency, c is the speed of sound wave transmission. for the first n the length of the drill pipe, is the total length of the two drillpipe couplings. According to the acoustic wave S parameter model, the equation (1) n Take the first term and rewrite it in the form of a two-port network S-parameter model:
[0063] (2)
[0064] figure 1 In , the center of the coupling is equivalent to the sound-transmitting membra...
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The invention relates to the technical field of telemetry of sound wave bi-directional data between a well base and a ground in exploration drilling, in particular to an establishment method for a sound wave drill stem information channel FIR theoretical model. The problem that a drill stem sound wave information channel cannot be completely studied in a laboratory exists in the prior art. On the basis of a sound wave seamless transmission model of a single drilling tool, through the technology of a digital wave filter, a feature model, conducting transmission along with frilling sound waves, of any drilling tool is established, and for various actual drill steam information channels, cascading of the feature model of the single drilling tool can be used for completely simulating transmission features of various actual sound wave information channels. By the adoption of the establishment method, various information channels can be established, simulation of various experimental platforms can be realized, for multiple instable experiment conditions before, simulation of an FIR can be used for analyzing the problems of sound wave transmission and reasons of success and failure of information transmission.
Description
Technical field: [0001] The invention relates to the technical field of acoustic wave remote transmission of two-way data between the bottom of a well and the ground during drilling, in particular to a method for establishing an FIR theoretical model of an acoustic drill string channel. Background technique: [0002] Steering drilling, geological drilling, intelligent drilling, safe drilling, improving drilling efficiency, improving the recovery rate of target formations, etc. are all indispensable to the data transmission system while drilling. The sound wave transmission system while drilling uses sound waves to transmit information between the surface and the downhole along the drill pipe. Its advantages are low development cost, high data transmission rate, and little interference from drilling fluid. [0003] There are many structures with unmatched acoustic impedance in the oil drill string structure. The uneven acoustic impedance seriously affects the performance of a...
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IPC IPC(8): G06F17/50
Inventor 尚海燕周静谢海明燕并男陈延军江南刘选朝薛晓书
Owner XI'AN PETROLEUM UNIVERSITY