针对现有井眼分离系数计算方法存在的不足,提出了基于邻井相对位置的井眼分离系数计算方法（简称相对位置法）,并进行了算例分析。在轨迹误差椭球模型的基础上,考虑邻井轨迹误差的相关性,推导了邻井相对误差椭球的计算公式,提出了基于邻井相对位置的分离系数计算公式,并利用共轭梯度法进行求解。算例分析表明,与椭球缩放法和椭球间距法相比,相对位置法计算结果更加精确,适用性更强,能更合理地评价井眼交碰状态。采用提出的方法进行大批量计算,并结合相应的防碰技术规范要求,可以快速简便地寻找关键设计参数的许用范围,在丛式井和定向井设计中具有较好的应用价值。图6表3参24
洪迪峰
,
唐雪平
,
高文凯
,
毛为民
,
王鹏
,
刘珂
. 基于邻井相对位置的井眼分离系数计算方法[J]. 石油勘探与开发, 2020
, 47(1)
: 186
-192
.
DOI: 10.11698/PED.2020.01.18
As the current calculation methods for wellbore separation factor have some deficiencies, a new calculation approach for wellbore separation factor based on the relative position of adjacent wellbores, named as relative position method for short, was proposed and analyzed. Based on the trajectory error ellipsoid model of single wellbore, the error ellipsoids model of adjacent wellbore was derived considering the correlation of trajectory errors between adjacent wells. Furthermore, the calculation formula of the separation factor based on relative position of adjacent wellbore was derived and solved with the conjugate gradient algorithm. Case study shows that the new approach is more precise and higher in applicability than the ellipsoid scalar method and the minimum distance method, it can evaluate the state of well collision more reasonably. By doing batch calculation with the new method and following the criterion of well collision avoidance, the permissible ranges of key parameters in the well design can be worked out quickly. This method has good application in the design of cluster wells and directional wells.
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