人工裂缝方位偏转对整体压裂效果影响研究
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摘要
受储层非均质性等因素的影响,人工裂缝方向可能偏离井网方向,影响整体压裂效果。为此以白豹油田长6储层菱形反九点注采井网为例,建立了整体压裂和人工裂缝方位偏转时的压裂数值模拟模型,进行了整体压裂裂缝参数优化,研究了人工裂缝方位偏转对生产动态的影响程度。结果表明,人工裂缝方位偏转后采出程度大幅降低,特别是最有可能的裂缝小角度偏转采出程度降低最多,经分析建议裂缝方位发生偏转时应进行局部注采井网调整或减小裂缝缝长。
Affected by the reservoir heterogeneity and other factors,artificial fracture orientation may deviate from the direction of well patterns,which are placed along favorable orientation,and the integral fracturing effect will be affected. So,taking rhomboid anti- nine spot pattern in Chang 6 reservoir of Baibao oilfield as an example,a numerical simulation model of integral fracturing with deflected fracture was established,the integral fracturing parameters were optimized and the influence of different fracture parameters on production performance was studied. Results showed that when the fracture orientation deflected,the recovery degree was reduced greatly,especially,when the fracture orientation deflects with a slight angle,the recovery degree was reduced to a great extent. In this case,adjusting local well pattern or reducing the fracture length was suggested.
Affected by the reservoir heterogeneity and other factors,artificial fracture orientation may deviate from the direction of well patterns,which are placed along favorable orientation,and the integral fracturing effect will be affected. So,taking rhomboid anti- nine spot pattern in Chang 6 reservoir of Baibao oilfield as an example,a numerical simulation model of integral fracturing with deflected fracture was established,the integral fracturing parameters were optimized and the influence of different fracture parameters on production performance was studied. Results showed that when the fracture orientation deflected,the recovery degree was reduced greatly,especially,when the fracture orientation deflects with a slight angle,the recovery degree was reduced to a great extent. In this case,adjusting local well pattern or reducing the fracture length was suggested.
引文
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[2]鲜成钢,程浩,郎兆新,等.低渗透油田井网模式研究[J].石油大学学报:自然科学版,1999,23(2):51-54.
[3]侯建锋.安塞特低渗透油藏合理井网开发系统研究[J].石油勘探与开发,2000,27(1):73-75.
[4]丁云宏,陈作,曾斌,等.渗透率各向异性的低渗透油藏开发井网研究[J].石油学报,2002,23(2):64-67.
[5]史成恩,李健,雷启鸿,等.特低渗透油田井网形式研究及实践[J].石油勘探与开发,2002,29(5):59-61.
[6]杨能宇,张士诚,王鸿勋.整体压裂水力裂缝参数对采收率的影响[J].石油学报,1995,16(3):70-76.
[7]王贤君,李存荣,张文明,等.海拉尔油田苏301区块整体压裂技术研究与应用[J].石油地质与工程,2012,26(4):107-109.
[8]卞晓冰,张士诚,刘天宇,等.乌南油田乌5区块整体压裂优化设计[J].钻采工艺,2012,35(1):41-44.
[9]梅蓉,高春宁,雷启鸿,等.华庆油田白153区低渗透长6油藏井网适应性研究[J].石油天然气学报,2013,35(2):131-135.
[10]付国民,刘云焕,宁占强.裂缝性特低渗透储层注水开发井网的优化设计[J].石油天然气学报,2006,28(2):94-96.
[11]张璋,何顺利,刘广峰.低渗透油藏裂缝方向偏转时井网与水力裂缝适配性研究[J].油气地质与采收率,2012,20(3):98-101.
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