崔传智,吴忠维,杜庆龙,朱丽红,单高军
CUI Chuanzhi,WU Zhongwei,DU Qinglong,ZHU Lihong,SHAN Gaojun

• 1:中国石油大学(华东)石油工程学院
• 2:大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

高含水期低饱和度油层补孔时机(补孔时油井的含水率)对提高多层油藏高含水期采出程度有重要意义。运用渗流理论及油藏工程方法建立了存在隔层的多层油藏高含水期低饱和度油层补孔渗流数学模型;并运用该模型研究了不同无因次初始含油饱和度、无因次注水速度、无因次渗透率及无因次厚度条件下,补孔时机对采出程度的影响,并给出了最优补孔时机。研究结果表明:随着补孔时含水率的增加,综合含水率98%采出程度与补孔3年后采出程度均增加;当补孔时含水率达到85%后,随着补孔时含水率上升,综合含水率98%采出程度与补孔3年后的采出程度增加幅度均变大;无因次饱和度、无因次厚度、无因次渗透率越大;综合含水率98%时的采出程度与补孔3年后的采出程度越大;无因次注水速度越大,补孔3年后采出程度越大;无因次注水速度不影响综合含水率98%的采出程度。研究结论:以综合含水率98%的采出程度为目标时,补孔时含水率取92%~96%为最佳;以开发3年后的采出程度为目标时,注水速度应在工程允许范围内尽量取大,补孔时含水率取92%~96%为最佳。
The time or opportunity of perforations adding( i. e. the watercut for the perforation added oil well) for the low-saturation oil layer at the high water cut stage is of great significance for improving the multi-reservoir recovery degree. By means of the seepage theory and reservoir engineering methods,the mathematical flow model was established for the perforations adding of the high-watercut low-saturation multi-layer oil reservoir with the barriers;under the conditions of different dimensionless initial oil saturation,the dimensionless water injection rate,the dimensionless permeability and the dimensionless thickness,the influences of the time on the recovery degree were studied with the help of the model. And moreover the optimal adding time was obtained. The research achievementsshow that with the increase of the adding time,the recovery degrees of 98% comprehensive watercut and after 3 years of perforations adding increase as well; when the perforation time is more than 85%,with the reduction of the perforation adding,the increments of the degrees stated above also increase. The greater the different dimensionless initial oil saturation,the dimensionless thickness and the dimensionless permeability are,the higher both the recovery degrees will be; the greater the dimensionless velocity of the water injection is,the greater the recovery degree after 3 years will be; the dimensionless speed of the water injection does not affect the recovery degree of 98% comprehensive watercut. The study concludes show that taking the recovery of 98% comprehensive watercut as the goal,92%-96% watercut is regarded as the best for the time of the perforation adding; taking the recovery after 3 years as the goal,the velocity of the water injection should take as higher as possible,the time of the perforation adding should also take 92%-96% of it as the best.

关键词(KeyWords)： 高含水期;低饱和度层;补孔;补孔时机;采出程度
high-watercut stage;low-saturation layer/formation/zone;perforations adding;perforation adding time/opportunity;recovery degree/factor

Abstract:

Keywords:

基金项目(Foundation): 国家重大科技专项“大型油气田及煤层气开发”资助项目(2016XZ05010-002-007)

作者(Author): 崔传智,吴忠维,杜庆龙,朱丽红,单高军
CUI Chuanzhi,WU Zhongwei,DU Qinglong,ZHU Lihong,SHAN Gaojun

DOI: 10.19597/j.issn.1000-3754.201710043

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