本文關(guān)鍵詞： 隨鉆測量 電磁傳輸 實時監(jiān)測 模擬系統(tǒng)　出處：《電子科技大學》2016年碩士論文　論文類型：學位論文

【摘要】：隨鉆測量無線電磁傳輸系統(tǒng)是一種利用低頻電磁波將井下傳感器測量到的井斜、方位等鉆井信息無線傳輸?shù)降孛姹O(jiān)控系統(tǒng),對勘探工程進行實時監(jiān)測的精密儀器。相比傳統(tǒng)的泥漿脈沖無線傳輸技術(shù),信號傳輸不受鉆井液影響,性能穩(wěn)定可靠,適用范圍更廣。我國隨鉆測量無線電磁傳輸技術(shù)由于起步較晚,大多處于試驗階段,水平較低,并未普遍應用,與國外先進的電磁隨鉆測量儀器相比還存在較大差距。因此,自主研制具備國際競爭力的隨鉆測量無線電磁傳輸系統(tǒng),打破國外技術(shù)壟斷是一項刻不容緩的任務。本課題以隨鉆測量無線電磁傳輸系統(tǒng)樣機的研制為背景,主要對隨鉆測量儀器的模擬系統(tǒng)進行研究和設計。主要工作包括:(1)根據(jù)實際工程需求及具體技術(shù)指標,提出了隨鉆測量無線電磁傳輸收發(fā)模擬系統(tǒng)的功能構(gòu)架與總體解決方案。(2)針對井下供電有限、發(fā)射倉電路空間狹小,以及發(fā)射天線輸入阻抗不穩(wěn)定等問題,本文設計了專用的功率放大電路及發(fā)射電流監(jiān)控電路,實現(xiàn)了井下電磁信號的高效可靠發(fā)射與功率的穩(wěn)定輸出。(3)由于電磁波的傳播介質(zhì)為有損耗地層,因此信號傳輸頻率非常低。本文采用了一種專用地面接收天線,實現(xiàn)了低頻微弱信號的有效接收。同時考慮到地面接收信號相當微弱且強弱不穩(wěn)定、接收天線輸出阻抗較大等問題,設計了相應的低噪聲接收電路,實現(xiàn)了微弱信號的有效檢測與電路增益的自動調(diào)節(jié)。(4)在地表和井孔內(nèi),分別對收發(fā)系統(tǒng)進行了一系列現(xiàn)場試驗,試驗結(jié)果表明:該儀器性能穩(wěn)定可靠,需求功能基本實現(xiàn),電路指標達到了預期的技術(shù)要求,為儀器的進一步完善與實際應用打下了堅實的基礎。
[Abstract]:The wireless electromagnetic transmission system of measurement while drilling is a kind of wireless transmission system which uses low frequency electromagnetic wave to transmit drilling information such as well inclination and azimuth measured by downhole sensors to the ground monitoring system. Compared with the traditional mud pulse wireless transmission technology, the signal transmission is not affected by drilling fluid, and the performance is stable and reliable. Because of the late start of wireless electromagnetic transmission technology, most of the technology is in the experimental stage, the level is low, and it is not widely used. Compared with the advanced electromagnetic measurement instruments abroad, there is still a big gap. Therefore, we have developed an international competitive wireless electromagnetic transmission system for measurement while drilling. It is an urgent task to break the foreign technology monopoly. This subject is based on the development of the prototype of the wireless electromagnetic transmission system while drilling. This paper mainly studies and designs the simulation system of measuring instruments while drilling. The main work includes: 1) according to the actual engineering requirements and specific technical indicators. The functional framework and overall solution of wireless electromagnetic transmission simulation system for measurement while drilling are put forward. Aiming at the limited underground power supply, the circuit space of the transmitter is narrow. As well as the instability of the input impedance of the transmitting antenna, a special power amplifier circuit and a monitoring circuit of the transmitting current are designed in this paper. The high efficient and reliable transmission of downhole electromagnetic signal and the stable output of power are realized because the propagation medium of electromagnetic wave is a lossy formation. Therefore, the signal transmission frequency is very low. In this paper, a special ground receiving antenna is used to realize the effective reception of low frequency weak signals. Due to the large output impedance of the receiving antenna, the corresponding low noise receiving circuit is designed, which realizes the effective detection of the weak signal and the automatic adjustment of the circuit gain. A series of field tests were carried out on the transceiver system respectively. The test results show that the instrument is stable and reliable, the required function is basically realized, and the circuit specifications meet the expected technical requirements. For the further improvement and practical application of the instrument laid a solid foundation.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TH763

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本文編號：1476021