Producing asphaltic crude oil

Wells – Processes – With indicating – testing – measuring or locating

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166370, 166304, E21B 4300

Patent

active

048218014

ABSTRACT:
An asphaltic crude oil is produced via a well system comprising a horizontal drainhole section extending through the reservoir formation. Formation plugging due to in-situ precipitation of asphalt during production operations is avoided by adequately sizing the horizontal drainhole section in the resevoir, thereby establishing near-wellbore pressures in the reservoir above the asphalt saturation pressure, without sacrificing production rates.

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Deul et al., "Degasification of Coalbeds--A Commercial Source of Pipeline Gas", American Gas Association Monthly, vol. 56, No. 1, Jan. 1974, pp. 4-6.
Hamby, Jr., T. W., et al., "Producing Mississippi's Deep, High--Pressure Sour Gas", Journal of Petroleum Technology, Jun. 1976, pp. 629-638.

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