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SUMMARY:'Mixing in Gravity Currents' and 'Gravity Driven Flow in a Horizon
 tal Annulus' - Diana Sher and Marcus Horsley - BP Institute
DTSTART:20170518T103000Z
DTEND:20170518T113000Z
UID:TALK72225@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Mixing in Gravity Currents\n\nA series of new laboratory exper
 iments have been carried out to measure the mixing in finite volume releas
 e currents and in currents produced from a steady source\, propagating alo
 ng a two-dimensional horizontal channel. A light attenuation technique was
  used to measure the distribution and evolution of the density of the flow
 \, and dye studies were used to follow the motion of the current and the a
 mbient fluid. In both types of currents\, a strong circulation develops in
  the head of the current\; as current fluid reaches the front of the flow\
 , it rises and mixes with ambient fluid which is displaced upwards over th
 e advancing head. The total volume and the total volume flux\, respectivel
 y\, are increasing with time. In the case of currents produced from a stea
 dy source\, the data reveal two main areas of mixing: immediately followin
 g inflow of the buoyant fluid to the tank and at the head of the current. 
 The partitioning of the mixing between these two regions depends on the so
 urce Froude number.\n\nGravity Driven Flow in a Horizontal Annulus\n\nDuri
 ng the horizontal drilling process an annular void is created between the 
 casing and drill hole. This void is initially full of a drilling fluid com
 monly referred to as mud. Once drilling has been completed the annulus is 
 filled with cement\, which upon curing\, will add stability and integrity 
 to the wellbore. The interface between the cement and mud - during the dis
 placement procedure – is crucial to determining the quality of the well 
 (Eduardo et al\; 2004). In this talk I will outline a 2D model\, and its i
 mplications on curing time\, for the time-dependent interaction of this mu
 d-cement interface after the cement has stopped being pumped.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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