Key Influencing Factors and Control Technology of Drilling Fluid Pressure in the Bitumen Zone

  • REN Liwei,,XIA Bairu, MAO Di, GUO Yuanheng
  • 1. College of Engineering and Technology, China University of Geosciences, Beijing 100083, China;
    2. Sinopec Oilfield Service Corporation, Beijing 100101, China

Received date: 2013-11-15

  Revised date: 2013-12-23

  Online published: 2014-02-15


The exploration of Y oilfield seriously suffered from safety problems in the bitumen zone. Slight fluctuation of low drilling fluid pressure may trigger the mobilization and invasion of near-wellbore bitumen, which may lead to complex accidents or well abandonment. Analysis indicated that it is hard to control the drilling fluid pressure because properties of bitumen-contaminated drilling fluid quickly got worse. Bitumen has good liquidity at high temperature and adhered solid particles easily. Even worse, displacement loss of drilling fluid and bitumen accelerated invasion of bitumen. Thus, the degree and speed of bitumen invasion got out of hand. Test results in lab and field showed that, in order to control drilling fluid pressure, the contents of bentonite and plugging materials at about 1% and 8% respectively in drilling fluid are crucial while drilling. Meanwhile, invasion speed of bitumen can be reduced by thickening and plugging technology during circulation stop. The managed pressure drilling (MPD) technology can be used to effectively control wellbore drilling fluid pressure and drill through bitumen formation with lower drilling fluid density. Then the displacement amount of bitumen and drilling fluid, invasion degree and speed were reduced to a "controlable" level.

Cite this article

REN Liwei,,XIA Bairu, MAO Di, GUO Yuanheng . Key Influencing Factors and Control Technology of Drilling Fluid Pressure in the Bitumen Zone[J]. Science & Technology Review, 2014 , 32(3) : 29 -33 . DOI: 10.3981/j.issn.1000-7857.2014.03.003


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