【摘要】：目前,很多陸地油田進(jìn)入開發(fā)后期,為了達(dá)到增產(chǎn)增效的目的,所鉆加密井、調(diào)整井越來越多;為了合理利用空間以及降低成本,海洋叢式井井口間距比較小,使得上部直井段井間距也較小。因此,如何避免井眼碰撞已經(jīng)成為很重要的問題。常規(guī)的井眼防碰分析方法很大程度上依賴于測斜儀數(shù)據(jù)的精確性,而測斜儀的測量精度很容易受到外加磁場源—尤其是鄰井套管的影響�；谔坠苤車艌龇植家�(guī)律可以判斷正鉆井相對于鄰井套管的空間位置,開展油氣井套管周圍磁場分布規(guī)律研究,可以增強(qiáng)對鄰井套管磁干擾的認(rèn)識(shí),有助于建立磁場敏感性因素與磁場范圍的表征關(guān)系,也有助于建立適應(yīng)范圍廣、成本低的防碰方法。本文對套管周圍磁場影響因素進(jìn)行了分析,指出套管感應(yīng)磁場、剩磁及套管接箍是影響套管周圍磁場的主要因素,從理論和實(shí)驗(yàn)兩方面探討了套管周圍的磁場分布規(guī)律。主要研究內(nèi)容及成果包括:建立了無限長直套管周圍磁場模型,采用分離變量法求解,并采用向量投影方式得到了任意姿態(tài)套管周圍磁場模型;采用三維積分方程法建立了有限長直套管周圍磁場模型;采用全尺寸套管進(jìn)行套管周圍磁場測試分析,分別對不同方位和距離的場點(diǎn)總磁場、水平磁場、豎直磁場以及磁傾角的異常值與變化率進(jìn)行分析,得到了不同磁場參數(shù)沿套管徑向和切向的變化規(guī)律,為今后反演鄰井套管的空間位置奠定了基礎(chǔ);采用小尺寸鋼管柱進(jìn)行了空間磁場測試,分別探討了鐵磁性管柱在有剩磁和無剩磁、有接箍和無接箍時(shí)空間磁場變化規(guī)律;將理論模型與實(shí)驗(yàn)結(jié)果進(jìn)行了對比驗(yàn)證,最終得到了修正的感應(yīng)磁場理論模型。
[Abstract]:At present, many terrestrial oil fields are entering the late stage of development, in order to achieve the purpose of increasing production and increasing efficiency, more and more infill wells and adjustment wells have been drilled. In order to make rational use of space and reduce costs, the spacing between the wellheads of ocean cluster wells is relatively small. The interval between the upper section of the vertical well is also smaller. Therefore, how to avoid borehole collision has become a very important issue. The conventional borehole anti-collision analysis method depends largely on the accuracy of the data of the inclinometer, and the accuracy of the inclinometer is easily affected by the external magnetic field source, especially the casing in the adjacent well. Based on the distribution law of magnetic field around casing, the spatial position of positive drilling relative to adjacent casing can be judged, and the study of magnetic field distribution around casing in oil and gas wells can enhance the understanding of magnetic interference of casing in adjacent wells. It is helpful to establish the relationship between magnetic field sensitivity factors and magnetic field range, and also to establish a wide range and low cost anti-collision method. This paper analyzes the influence factors of the magnetic field around the casing, and points out that the inductive magnetic field, the remanent magnetic field and the casing coupling are the main factors affecting the magnetic field around the casing. The distribution law of the magnetic field around the casing is discussed theoretically and experimentally. The main research contents and results are as follows: the magnetic field model around the infinite straight casing is established and solved by the separation variable method, and the magnetic field model around the casing with arbitrary attitude is obtained by vector projection. The magnetic field model around a finite length straight casing is established by using the three-dimensional integral equation method, and the magnetic field around the casing is measured and analyzed by using the full-size casing. The total magnetic field and the horizontal magnetic field of the field point with different azimuth and distance are measured and analyzed respectively. The abnormal values and variation rate of vertical magnetic field and magnetic dip angle are analyzed, and the variation law of different magnetic field parameters along the casing radial and tangential direction is obtained, which lays a foundation for retrieving the space position of casing in adjacent wells in the future. The spatial magnetic field changes of ferromagnetic pipe column with and without remanence, coupling and without hoop are discussed, and the theoretical model and experimental results are compared and verified. Finally, the modified theoretical model of induction magnetic field is obtained.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE931.2

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本文編號(hào)：2180875