“九五”期间PetroChina老区原油产能建设成效分析

为分析PetroChina(中国石油天然气股份有限公司)“九五”期间老区原油产能建设项目的成效,将数理统计和油藏工程方法相结合,从子区块、油区和PetroChina整体3个层面对项目的产能到位率、开发指标变化趋势及经济指标进行了研究。结果表明：老区原油产能到位率总体水平较高;产能建设越晚,新井平均初始产油量越低,但新井产油量在后续几年的平均递减速率与建产时间基本没有相关关系;产能建设越晚,新井后续生产的含水率水平越高,反映老区原油开发中后期的调整潜力及效果逐年变差。从经济指标看,该项目在1996--2001年生产的原油总量中,有95．2％取得了较好的经济效益;大部分建产子区块的平均投资回收期为4．24a;平均百万吨老区原油产能的投资为17．76亿元人民币。虽然开发中后期老区调整风险大,但PetroChina老区原油新建产能总体获得了较高经济效益。图4表4参5

Achievements of projects for crude oil development of PetroChina produced oilfield units during the "Ninth-five Years Project"

In order to understand the achievements of the produced oilfield units' crude oil development projects during the "Ninth-five Years Project" in PetroChina, the statistics and reservoir engineering methods are used to analyze their productivity coincidence rates, major development characters' behavior and the economic index from the following levels: sub-units where the construction projects were implemented, the oil fields, and whole PetroChina. The average productivity coincidence rate was quite high; the later the project was implemented, the less its new producers' initial output was, but the production decline rate had little relation to which year the project was implemented; the later year's projects led to higher water cut levels, indicating less and less potential and effect in produced reservoirs adjusting during their middle or late life periods; the economic indexes showed that 95.2% of the whole crude oil output during 1996-2001 in these projects had brought a quite high economic profit, and that the majority of units had gotten an average investment payback period of 4.24 years, and that these projects' investment averaged 17.76×108 RMB Yuan per million tons productivity. Although challenged with great risks, the projects of oil development in the produced oilfield units which entered middle or late life periods, did achieve quite good economic returns.