MCS Production Tubing
for
Oil Wells

It is anticipated that MCS production tubing can used in oil wells to extend the natural flowing phase and to improve the efficiency of artificial gas lift.  

In the natural flowing phase, oil wells produce at steady state.
With depletion, pressure declines, and more dissolved gas comes out of solution in the reservoir and up the wellbore.
Gas phase in the near wellbore region reduces the relative permeability of liquids, and the depletion of dissolved gas reduces the viscosity/mobility of reservoir liquids toward the wellbore, both increasing the GLR.  And the increased presence of gas in the tubing results in less-efficient gas-liquid flow regimes up the well (bubble, slug, churn and annular).  De-gassification accelerates, especially once the annular flow regime develops near the top of the well.

It is recommended that MCS production tubing be employed
in the region where the churn/annular flow regimes appear.
Slippage of the gas phase past liquid increases by up to several times once slug flow evolves into churn flow, and by 10 to 100 times more with the advent of annular flow.  

MCS production tubing would effectively reduce gas slippage, especially during annular flow.  This is true if the flow is split into 3 flows or into 30 flows.  Universally, the higher the number of flow passageways, the greater the reduction in gas phase slippage.  

Custom MCS production tubing designs would likely be required due to the higher pressure environment vs. most aging gas wells and the higher volume of liquid to be produced.       



 





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