本文關(guān)鍵詞：油基泥漿測井儀多通道采集模塊設(shè)計　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 油基泥漿 測井噪聲模型分析 微弱信號檢測 鎖相環(huán)同步

【摘要】：近年來國內(nèi)外正爭相研發(fā)具有自主知識產(chǎn)權(quán)的油基泥漿測井儀,因為油基泥漿相比于常規(guī)的水基泥漿具有耐高溫、耐腐蝕、增強井眼穩(wěn)定性、提高鉆井效率等優(yōu)點,且能夠適應(yīng)水基泥漿的測井環(huán)境。多通道采集模塊是油基泥漿測井儀最為關(guān)鍵的功能模塊之一,其主要作用是檢測流經(jīng)紐扣電極的電流信號,并且完成小信號的提取、放大、濾波、采集和數(shù)據(jù)運算等功能,接收處理模塊下發(fā)的命令并進行數(shù)據(jù)傳輸。采集模塊的性能直接決定了測井儀對地層電阻率測量的精確度。由于多通道采集模塊采集的是極微弱的電流信號,本文對油基泥漿測井儀采集模塊的噪聲進行了全面的分析,建立了噪聲的數(shù)學(xué)模型,并且根據(jù)數(shù)學(xué)模型采取了在算法和電路設(shè)計上抑制噪聲的方法。在多通道采集模塊的后續(xù)的模擬電路設(shè)計及數(shù)字邏輯設(shè)計上考慮并遵循抑制噪聲,提高信噪比的原則,有助于油基泥漿測井儀更精確地測量地層的電阻率。并且建立采集模塊的電流輸入模型,通過數(shù)學(xué)推導(dǎo),分析了采集模塊信號提取電路內(nèi)電阻阻值對地層阻抗測量的干擾程度。本文主要涉及的內(nèi)容有電阻熱噪聲分析,運放固有噪聲分析,模數(shù)轉(zhuǎn)換器固有噪聲分析,模擬開關(guān)串?dāng)_噪聲分析,模擬開關(guān)切換噪聲分析及線上串?dāng)_噪聲分析,考慮雜散電容時ADC外圍電路設(shè)計,接地分割及跨地系統(tǒng)信號的處理,微弱電流信號提取、調(diào)理電路設(shè)計,鎖相環(huán)同步方案設(shè)計等,并且在算法上應(yīng)用了能夠提高測量精度的數(shù)字相敏檢波算法。最后根據(jù)多通道采集模塊的指標(biāo)要求,通過一系列實驗驗證了模塊設(shè)計的合理性與正確性。其中測井周期時間實驗驗證了測井時間滿足指標(biāo)要求,通道內(nèi)校準(zhǔn)實驗驗證了內(nèi)校準(zhǔn)通道設(shè)計的合理性,電流電壓采集同步實驗驗證了鎖相環(huán)同步方案的正確性,高溫實驗驗證了模塊在高溫下工作的性能,電流采集電路噪聲抑制試驗驗證了采集模塊對噪聲的抑制能力,小電流實驗驗證了采集模塊電流檢測能力,井下實地測井實驗驗證了采集模塊符合整支儀器的測井需求。
[Abstract]:In recent years at home and abroad are scrambling to develop the oil base mud logging instrument with independent intellectual property rights, because the oil base mud compared to conventional water base mud has the advantages of high temperature resistance, corrosion resistance, enhance wellbore stability, improve drilling efficiency, and can adapt to the environment of water base mud logging. Multi channel data acquisition module is one of the most important functional modules of oil based mud logging instrument, its main function is to detect electrical signals through the button, and complete the function of extraction, amplification, signal filtering, data acquisition and calculation, receiving and processing module issued orders and data transmission. The performance of the acquisition module directly determines the accuracy of the logging instrument to measure the resistivity of the formation. Because of the multi-channel acquisition module is the current extremely weak signal, the noise of oil based mud logging acquisition module is analyzed. The mathematical model is established according to the mathematical model of noise, and adopted a method to suppress the noise in the circuit design and algorithm. In the subsequent analog circuit design and digital logic design of multi-channel acquisition module, the principle of suppressing noise and improving signal-to-noise ratio is considered and followed, which helps oil well mud logging tool to measure resistivity of formation more accurately. And the current input model of the acquisition module is set up. The interference degree of the resistance value in the signal acquisition circuit of the acquisition module to the formation impedance measurement is analyzed by mathematical deduction. In this paper, the main contents are the analysis of resistance thermal noise, analysis of the inherent noise amplifier, analog-to-digital converter analysis of inherent noise analysis, analog switch crosstalk noise, noise analysis and simulation analysis of switching line crosstalk noise, ADC peripheral circuit design considering the stray capacitance, grounding system and cross signal segmentation, extraction, weak current signal the design of the regulating circuit, PLL design, and the application can improve the measurement accuracy of the digital phase sensitive detection algorithm in the algorithm. Finally, according to the requirements of the multi-channel acquisition module, the rationality and correctness of the module design are verified through a series of experiments. The cycle time logging experiments verify the logging time meet the requirements, the channel calibration experiments verify the rationality of the design of internal calibration channel, current and voltage acquisition synchronization experiment verified the correctness of PLL synchronization scheme, high temperature experiments verify the performance module work under high temperature, verify the inhibition ability of the module of collection of noise the current collecting circuit inhibition test, small current experiments verify the current acquisition module detection ability, downhole logging field experiments with a log collection module demand instrument.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TP274.2

【參考文獻】

相關(guān)期刊論文 前8條

1 梁世盛;喬鳳斌;張燕;;基于FPGA的數(shù)字相敏檢波算法實現(xiàn)[J];自動化儀表;2013年11期

2 于增輝;劉耀偉;張志剛;;國產(chǎn)微電阻率掃描成像測井儀ERMI開發(fā)與應(yīng)用效果[J];海洋石油;2012年02期

3 夏均忠;劉遠宏;冷永剛;葛紀(jì)桃;;微弱信號檢測方法的現(xiàn)狀分析[J];噪聲與振動控制;2011年03期

4 王婷;;互連線上串?dāng)_的抑制策略[J];科技信息;2010年29期

5 向亞林;周勝;李紅剛;;XRMI及應(yīng)用研究[J];長江大學(xué)學(xué)報(自然科學(xué)版)理工卷;2009年02期

6 任豐原;董思穎;何滔;林闖;;基于鎖相環(huán)的時間同步機制與算法[J];軟件學(xué)報;2007年02期

7 于麗霞;王福明;;微弱信號檢測技術(shù)綜述[J];信息技術(shù);2007年02期

8 周勝海;集成多路模擬開關(guān)的應(yīng)用技巧[J];電子技術(shù)應(yīng)用;2002年04期

相關(guān)會議論文 前2條

1 肖立志;;油氣測井科學(xué)的若干前沿問題[A];中國地球物理.2003——中國地球物理學(xué)會第十九屆年會論文集[C];2003年

2 劉昱;謝志文;梁志強;;多頻聲逼近粉紅噪聲的研究[A];2009年聲頻工程學(xué)術(shù)交流年會論文集[C];2009年

相關(guān)碩士學(xué)位論文 前2條

1 李方方;微弱信號檢測與采集技術(shù)的研究[D];哈爾濱工業(yè)大學(xué);2006年

2 汪龍;激光測距成像系統(tǒng)中的采樣累積法研究[D];浙江大學(xué);2006年

，

本文編號：1338311