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[B-2 Spirit]

Dear All,

 

I am currently working on a Steam Assisted Gravity Draining project for recovering oil from oil sands.

First the reserviour pressure is reduced from 600 psig to 100-200 psig after which steam is injected to mobilize the oil in the oil sands, thus it can be pumped out.

 

I am facing a problem in deciding the design condition of piping & equipment handling production fluids from Tubing i.e. produced oil & water.  

The reserviour conditions are as follows:

Fracture pressure = 1000 psig

at 1000 psig the steam sat temperature is 546°F so design conditions for the Casing is 1000 psig at 546 °F.

 

The piping d/s of the tubing connections sees the pressure generated by the pump which is approximately 160 psig at the well head. The temperature can be same as the steam temperature. The pump considered is a positive displacement pump and we are taking credit of High Pressure Trip of the pump to limit the design pressure required.

 

My Question is:

IS IT PRACTICALLY POSSIBLE TO GET CASING PRESSURE & TEMPERATURE IN THE TUBING? OR IS THE MECHANICAL CONSTRUCTION OF THE DOWNHOLE PUMP IS SUCH THAT IT WILL NEVER BE EXPOSED TO CASING PRESSURE & TEMPERATURE CONDITIONS. 

the answer to this will decide whether we have to consider the casing design pressure and temperature condition for the production fluids ie.e oil + water in tubing from pump discharge.

 

It is somewhat different than the shut-in tubing pressure.

 

I am new to designing oil facilities & steam floods, so please excuse if I have used wrong terminologies.

 

thanks

B2Spirit.