【摘要】：現行的井眼軌跡監(jiān)測方法以網格北為指北基準,沒有考慮子午線收斂角和磁偏角沿井眼軌跡和隨時間的變化,致使北坐標、東坐標等參數明顯存在誤差。建立了以真北方向為指北基準的井口坐標系,通過揭示井口坐標系與大地坐標系之間的轉換關系,提出了高精度井眼軌跡監(jiān)測方法。這種高精度監(jiān)測方法考慮了磁偏角的時空變化,利用國際地磁參考場隨時隨地求取磁偏角,并且不涉及子午線收斂角問題。結果表明:高精度監(jiān)測方法與現行監(jiān)測方法算得的垂深和水平長度相同,但北坐標、東坐標、水平位移和平移方位等參數不同。在地圖投影變形大、地磁場變化大的地區(qū)鉆井,尤其是鉆大位移井,現行監(jiān)測方法的計算誤差可達數米,因此應使用高精度監(jiān)測方法。
[Abstract]:The current well trajectory monitoring method takes the north grid as the reference point and does not take into account the variation of meridian convergence angle and magnetic deviation angle along the borehole trajectory and with time, resulting in obvious errors in parameters such as the north coordinates and the east coordinates. The wellhead coordinate system with the true north direction as the reference point is established. By revealing the conversion relationship between the wellhead coordinate system and the geodetic coordinate system, a high-precision wellbore trajectory monitoring method is proposed. This high precision monitoring method takes into account the temporal and spatial variation of the magnetic deviation angle and uses the international geomagnetic reference field to obtain the magnetic deflection angle at any time and anywhere and does not involve the meridian convergence angle problem. The results show that the vertical depth and horizontal length calculated by the high precision monitoring method are the same as those obtained by the current monitoring method, but the parameters of the north coordinate, the east coordinate, the horizontal displacement and the translation orientation are different. In the areas where the map projection deformation is large and the geomagnetic field changes greatly, especially in the large displacement wells, the calculation error of the current monitoring methods can reach several meters, so the high precision monitoring method should be used.
【作者單位】： 中國石油化工股份有限公司石油工程技術研究院;
【基金】：國家重大科技專項(2011ZX05005-006)資助
【分類號】：TE24

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