METHOD OF PRODUCING VISCOUS HYDROCARBONS BY STEAM-ASSISTED GRAVITY DRAINAGE
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United States of America Patent
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app pub date -
Jun 6, 2013
filing date -
Jun 6, 2012
priority date (Note) -
Abandoned
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Abstract
A non-cemented liner (20) is introduced into an injection bore (21), steam is fed into the liner at a first bore part (24) and injected into the reservoir through holes (22, 23) in the liner distributed so that the total hole area per length unit of the liner is greater at a second part (25) than at the first part of the bore. Steam enters an annular space between liner and bore only through holes near first part of the bore and subsequently gradually travels inside the liner in direction of second bore part and gradually enters the annular space through holes nearer and nearer second bore part. Gradually liquid is displaced away from an upper liner part and an upper part of the annular space, so that steam contacts the bore along substantially the entire length of the liner in the upper part of the annular space.
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