摘要
肯基亚克盐下油田油藏埋藏深、压力高、地质条件复杂、钻井难度极大。其主要地质特点是 :下二叠系盐层发育 ,盐层厚度可达 3 0 0 0m以上 ;石炭系灰岩油层孔隙压力系数高达 1 .90～ 1 .94 ,钻井液安全密度窗口窄 ,溢漏同层 ,极易出现先漏后喷的复杂局面。由西南石油学院针对肯基亚克盐下油田复杂地质条件研究开发的钻井液系列技术 ,包括钻巨厚盐层技术、漏喷同层的压力控制技术、高密度盐水流变性控制等技术 ,大斜度井防卡、解卡技术、灰岩裂缝性油气层的保护技术等 ,解决了诸多直接影响钻井安全的问题。经 2 0 0 2、2 0 0 3年肯基亚克盐下油田 9口井的应用 ,钻井复杂事故率大大降低 ,钻井速度显著提高 ,油井原油产量大幅上升 ,钻井成功率达 1 0 0 % ,取得了良好的效果。 (该文是“肯基亚克盐下油田的钻井液技术研究”一文的续文。)
This paper is the second part of APPLICATION of DRILLING FLUID TECHNOLIGY in KENKYAK OILFILD.The reservoirs in Kenkyak oilfield are deep and high pressured reservoirs with complicated geological condition. The main characteristics of formation are :the salt formation is so developed that may reach about to 3000 meter thickness in permian above main area of salt dome .Reservoir pore pressure coefficient of carboniferous system is up to 1.90-1.94. Because carbonate rock which is the main reservoir developed many cracks that caused not only mud loss but also well kicked, and the safety density window of drilling fluid was narrow, first lost circulation then well blowout was easily happened. In the past thirty years ,many drilling accidents such as well blowout, mud loss, well slough, stick pipe were often happened .The obvious characteristic of drilling engineering was to have many accidents ,slowly pace and lower successful rate .It seriously influenced drilling works that many drilling accident happened by the complicated geological condition causing .Based on these characteristics of formation ,a series drilling fluid technologies for preventing accidents were developed by Southwest petroleum institute(SWPI) ,and then used in 9 wells in Kenkyak oilfield successfully during 2002 and 2003 year. By adopting these technologies ,the remarkable application effects have been achieved ,such as the drilling accident rate greatly reduce, the drilling pace obviously improved , drilling successful rate was up to 100%.
出处
《西南石油学院学报》
CSCD
2004年第5期42-45,共4页
Journal of Southwest Petroleum Institute
关键词
肯基亚克
盐层
流变性
安全密度窗口
井漏
防卡
Kenkyak
salt bed
rheology
safety density window
lost circulation
sticking prevention
