尕斯库勒油田N1-N2^1油藏下盘井区异常压力浅析  

Primary Analysis on the Abnormal Pressure of the Downdip Wall Well of N1-N2^1 Oil Reservoir in Gasikule Oilfield

作　　者：马洪[1] 朱立林[2] 邵振军[3] 梁玉杰[3] 

机构地区：[1]中国地质大学(北京)海洋学院,北京100029 [2]青海油田分公司采油一厂,甘肃敦煌816404 [3]大庆油田有限公司第四采油厂,黑龙江大庆163511

出　　处：《石油钻探技术》2006年第6期14-16,共3页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目"大型坳陷湖盆坡折带的构造-古地貌-剥蚀沉积响应耦合"(编号:40272057);"973计划"项目(编号:2001GB209103)资助

摘　　要：对尕斯库勒油田N1一N21油藏的钻采情况进行分析发现,近年来该油藏下盘跃350井区在钻井过程中经常钻遇异常高压区。以350井区为例,对异常高压区进行分析认为:在注采井组中,注水井射开不连通的地层后,经过长期的注水,注入水在孤立油砂体的地层附近形成高压区,即异常高压区。分析形成异常高压区的原因有3个:储层砂岩体中粘土矿物的存在、孤立油砂体的不连通性及加密注水井。建议今后在异常高压区域钻注水井时,应对钻井区进行全面地质论证,充分考虑地层在长期高压注水的情况下,地层纵、横向上的压力变化,根据实际地质情况,对油藏进行精细描述,结合油砂体的分布,分析油藏水驱油效果及油水关系,对注水油藏进行开发调整,以便更好地认识油藏中的孤立油砂体,有针时性地开发孤立油砂体。Recent drilling and oil production operations on the N1-N2^1 block in the Gasikule Oilfield indicates specific abnormal pressure zones. Researches on the Yue 350 Well indicate origin of abnormal pressure zone. After noncommunicating formations are communicated by water injection among injection-production wells for a long term, the injected water tend to form high pressure zones nearby the isolated oil sandstone. Three reasons for abnormal pressure are respectively clay minerals in sand reservoir, noncommunicating isolated oil sandstone, and concentrated injection wells. It is recommended that the drilling area should be comprehensively analyzed with respect to geological characteristics if injection wells will be drilled at abnormal pressure zone in the future with great considerations of the pressure variation along vertical and horizontal directions under long period of injections. Based on the actual geologic condition, the fine description of reservoir should be conducted combining the distribution of oil sandstones to analyze the water drive effects and to adjust production proposal, so that the isolated oil sandstones are recognized well to exploit them with specific intentions.

关 键 词：异常压力 注水井 油砂体 连通图 跃350井 

分 类 号：TE28[石油与天然气工程—油气井工程]