渤海油田无人平台批量修井敏感性研究

Study on Sensitivity of Batch Workover on Unmanned Platform in Bohai Oilfield

随着渤海油田开发进程的不断推进,海上无人平台数量增加。目前渤海无人平台动管柱修井作业主要依靠自升式钻井平台。由于自升式钻井平台动复员费用高,长期以来无人平台的动管柱修井作业大多采用批量修井作业方式。在分析批量修井造成的原油产量损失以及自升式钻井平台的修井费用的基础上,提出无人平台批量修井敏感性分析的方法:通过对油田修井频率的统计分析,得出油田修井频率;根据油田的配产指标,分析批量修井对原油产量的影响;分析计算不同批量修井产生的动复员费以及对应的原油产量损失,确定不同批量修井的敏感系数。研究结果表明,无人平台修井在油田开发前期单井原油产量较高的情况下,适宜采用一口井一修的修井方式;开发中后期,适宜采用2口或3口井一修的修井方式。

With the development of Bohai oilfield,the number of unmanned offshore platforms has increased.At present,the workover operation with moving string on unmanned platform in Bohai Sea is mainly dependent on jack-up drilling platforms.Due to the high cost of mobilization and demobilization of jack-up drilling platforms,batch workover has been used in the workover operations with moving string on unmanned platforms for a long time.By analyzing the loss of crude oil production caused by batch workover and workover cost of jack-up drilling platforms,a method for the sensitivity analysis of unmanned platform batch workover is proposed.Through the statistical analysis of the frequency of oilfield workover,the frequency of oilfield workover is obtained.According to the productivity index of oilfield,the influence of batch workover on crude oil production is analyzed.The sensitivity coefficients of different batch workovers are determined by calculating the costs of mobilization and demobilization caused by different batch workovers and the corresponding crude oil output loss.The research results show that when the crude oil production of single well is high in the early stage of oilfield development,the workover mode of one well with one workover is suitable;in the middle and late stage of development,the workover mode of two or three wells with one workover is suitable.