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融合DBSCAN多測(cè)點(diǎn)算法的磁方位校正
網(wǎng)絡(luò)安全與數(shù)據(jù)治理 2期
許澤凡,宋紅偉,張明菊,胡少兵,陳雪菲,程為彬
(長(zhǎng)江大學(xué) 油氣資源與勘探技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,湖北 武漢430100)
摘要: 單測(cè)點(diǎn)校正法計(jì)算復(fù)雜、不穩(wěn)定、誤差較大,無法滿足井下地磁方位角的精度要求。基于間接單測(cè)點(diǎn)分析法和Brooks多測(cè)點(diǎn)分析法,提出一種新方法,通過DBSCAN(Density-Based Spatial Clustering of Applications with Noise)算法識(shí)別并剔除噪聲,采用橢圓校正法校正徑向干擾,軸向干擾則由單軸多測(cè)點(diǎn)分析法校正。實(shí)驗(yàn)證明:改進(jìn)多測(cè)點(diǎn)法不僅可以進(jìn)一步提高橢圓校正的擬合效果,還能降低噪聲對(duì)參考點(diǎn)計(jì)算值的影響,計(jì)算得到的方差曲線收斂性更強(qiáng)、更穩(wěn)定,校正后方位角誤差進(jìn)一步降低。
中圖分類號(hào): TE29
文獻(xiàn)標(biāo)識(shí)碼: A
DOI: 10.19358/j.issn.2097-1788.2023.02.013
引用格式: 許澤凡,宋紅偉,張明菊,等. 融合DBSCAN多測(cè)點(diǎn)算法的磁方位校正[J].網(wǎng)絡(luò)安全與數(shù)據(jù)治理,2023,42(2):83-88.
Magnetic azimuth correction based on DBSCAN multi-station analysis algorithm
Xu Zefan,Song Hongwei,Zhang Mingju,Hu Shaobing,Chen Xuefei,Cheng Weibin
(Key Laboratory of Exploration Technologies for Oil and Gas Resources,MOE,Yangtze University,Wuhan 430100,China)
Abstract: The single-point correction method is complex and unstable with large of errors, which cannot meet the precision requirements of the downhole azimuth. Based on the indirect single measurement point analysis method and the multi-station analysis of Brooks, a new method is proposed to identify and eliminate noise by the Density-Based Spatial Clustering of Applications with Noise(DBSCAN), and the ellipse correction method is used to correct the radial interference, the axial interference is corrected by the uniaxial multi-station analysis algorithm. Experiments show that improving the multi-station analysis not only further improves the fitting effect of ellipse correction, but also reduces the influence of noise on the calculated value of reference points, making the calculated variance curve more convergent and more stable, and the corrected azimuth error is further reduced.
Key words : magnetic azimuth correction;multi-station analysis method;DBSCAN(Density-Based Spatial Clustering of App- lications with Noise);ellipse correction

0 引言

實(shí)鉆軌跡的描述與計(jì)算是石油鉆井中井眼軌跡監(jiān)測(cè)的重要環(huán)節(jié)[1],也是井眼軌跡控制和調(diào)整的基礎(chǔ)。目前隨鉆測(cè)量工具以加速度計(jì)和磁通門作為姿態(tài)傳感器,解算井下鉆具姿態(tài)信息,已知加速度計(jì)誤差校正技術(shù)相當(dāng)成熟,而井下磁場(chǎng)環(huán)境未知、復(fù)雜,磁通門實(shí)測(cè)數(shù)據(jù)存在較強(qiáng)的磁干擾,導(dǎo)致方位角解算誤差大,易造成脫靶、井眼碰撞等問題。

磁場(chǎng)干擾的主要誤差來源包括外部磁場(chǎng)、傳感器、底部鉆具組合、儀器不居中和測(cè)量深度[2]。Russel在不考慮徑向干擾的情況下,根據(jù)當(dāng)?shù)氐卮艌?chǎng)、軸向干擾磁場(chǎng)和實(shí)測(cè)磁場(chǎng)之間的分量幾何關(guān)系,提出Russel法校正軸向干擾。羅武勝、徐濤等人對(duì)此方法進(jìn)行詳細(xì)的驗(yàn)證[3-4]。Sperry-Sun公司隨之提出間接單測(cè)點(diǎn)校正法,即短鉆鋌修正法。Van Dongen在考慮軸向干擾時(shí),提出旋轉(zhuǎn)鉆柱360°的方法校正徑向干擾。針對(duì)這類校正法,范光第、許昊東等人進(jìn)行對(duì)比驗(yàn)證[5-6]。劉建光、底青云等人對(duì)Brooks多測(cè)點(diǎn)分析算法進(jìn)行改進(jìn)[7],通過井眼軌跡函數(shù)和剩磁場(chǎng)干擾的函數(shù)關(guān)系縮小軸向校正值的求解范圍。

為降低噪聲對(duì)磁干擾校正結(jié)果的影響,由李海濤將DBSCAN算法用于磁羅盤校正的研究[8],得出一種融合DBSCAN多測(cè)點(diǎn)算法的磁方位校正法,通過DBSCAN算法剔除噪點(diǎn),根據(jù)橢圓校正原理校正徑向干擾,采用單軸多測(cè)點(diǎn)分析法校正軸向干擾。校正結(jié)果表明,方位角誤差有所減小。




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作者信息:

許澤凡,宋紅偉,張明菊,胡少兵,陳雪菲,程為彬

(長(zhǎng)江大學(xué) 油氣資源與勘探技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,湖北 武漢430100)


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