超临界二氧化碳钻井流体关键技术研究.pdf

第40卷第2期
石油钻探技术
ol. 10 NO. 2
2012年3月
PETROLEUM DRILLING TECHNIQUES
专家视点
doi:10.3969/j.issn.1001-0890.2012.02.001
超临界二氧化碳钴井流体关键技术研究
邱正松,谢彬强1,王在明2,沈忠厚1
(1.中国石油大学(华东)石油工程学院,山东青岛26680;2.中国石油冀东油田分公司钻采工艺研究院,河北唐I山06300
摘耍:超临界二氧化碳钴井技术是利用超临界二氧化碳作为钻井流体的一种新型钻井方法,具有能有效驱
动深井井下马达,控制井底压カ容易,破岩门限压力低、破岩速度快,能防止储层损害等优点,但成功利用超临界
氧化碳钴井技术的关键是充分了解超临界二氧化碳钻井过程中井筒中二氧化碳流体的温度和压力分布。为此,建
立了考虑井筒流体与地层换热对井筒流体温度影响的并筒传热模型,根据能蚤守恒原理,推导出了井筒流体温度
计算模型,并考虑到钻井过程中可能钻遇水层的情况,对该计算模型进行了修正;利用有限元方法,推导出了并簡
内二氧化碳钴井流体的压力计算公式。实例计算表明:钻杆内二氧化碳流体的温度和压力随井深增深而増大,但
与井深的关系是非缄性关系;钻杆内二氧化碳流体的密度随井深的増加而减小,但到近钻头处开始增大。环空中
的压力随井深的增加而增大,但两者的关系也是非线性关系;环空中的温度随井深增加先升高后降低;环空中的二
氧化碳密度随井深增加而增大,但两者为非线性关系
关键词:超临界二氧化碳钻井流体温度分布压力分布
中图分类号:TE21文献标识码:A文章编号:1001-0890(2012)02-0001-07
Key Technology on Drilling Fliud of Supercritical Carbon Dioxide
Qiu Zhengsong, Xie Binqiang, Wang Zaiming, Shen Zhonghou
College of Petroleum Engineering, China University of Petroleum ( Huadong), Qingdao, Shan
dong, 266580, China 2. Drilling &Production Research Institute, Petrochina Jidong Oil field Company, Tang
shax, Hebei, 063000, China)
Abstract: The supercritical carbon dioxide (SC-CO2 drilling technology is a new type of drilli
method, which has the advantage of effective driving of downhole motor in deep underbalance drilling, easy
control of downhole pressure, low threshold pressure and fast speed of rock breaking, preventing reservoir
Image etc. The key in successful use of SC-CO2 drilling technology is fully understanding the temperature
and pressure distribution of the carbon dioxide fluids in wellbore during the driling process. Therefore, the
mathematical model taking into account of the effects of heat exchange between the wellbore fluid and th
formation on well fluid temperature was set up. The model for wellbore temperature calculation was de
rived based on energy conservation principle. In the case of encountering water layer, the model was recti
fied. With the finite element method, the wellbore pressure and pressure lose can be calculated. Case calcu
lation results show that temperature and pressure of carbon dioxide fluid in the drill pipe increases with the
depth, but the relationship of temperature and pressure with depth is non-linear. The density of carbond o
oxide fluid in drill pipe decreases with the increase of depth, but it begins to increase near drill bit. Annulus
pressure increases with the Increase o
he depth, but the relationship between the two is non-linear. With
the increase of depth, the temperature in annulus increases first and then decreases. The density of carbon
dioxide increases with the depth in annulus, but the relationship between the two is also non-linear.
Key words supercritical carbon dioxide; drilling fluid; temperature distribution; pressure distribution
在气体钻井和欠平衡钴井中通常使用空气或氮
收稿日期:2011-08-27;改回日期:2012-02-08
气作为钻井流体,但空气易爆炸,氮气由于密度低,
作者简介:谢彬强(1981ー),男,山东淄博人,2004年毕业于西南
石油学院应用化学专业,2006年获西南石油大学油气井工程专业硕士
不能为井下动力钻具提供足够的动力,如果使用泡
学位,在读博士研究生,主要从事油田工作液及储层保护方画的研究
沫钻井流体,难以在全井实施欠平衡钻井。20世纪
联系方式:(0532)86981705,xiebinqiang1981(p163.com
末出现的超临界二氧化碳钻井技术,在欠平衡钻井
通讯作者:邱正松,qu63n,sina.com。
基金项目:国家自然科学基全重点项目“超临界二氧化碳在非常
中具有能有效驱动深井井下马达,控制井底压力容规油气藏中应用的基础研究(51034000?分研究内容。