PRODUCTION STRING USED FOR THICKENED OIL THERMAL RECOVERY IN HORIZONTAL WELL

摘要

Disclosed is a production string used for thickened oil thermal recovery in a horizontal well. The production string comprises a production sleeve (1). Two primary screen pipes (4) are connected to a horizontal section of the production sleeve. An oil drawing pipe (7) is fixed into a vertical section of the production sleeve through a packer (6). The horizontal end of the oil drawing pipe freely extends in the horizontal well section formed by the two primary screen pipes and a sleeve (2). A horizontal section of the oil drawing pipe is provided with a secondary screen pipe (11). In the horizontal well, two outer-pipe packers (3) enable an open well to be divided into three parts. That is, oil liquid in the horizontal well enters the periphery of the oil drawing pipe through the two primary screen pipes. At this moment, the oil liquid entering from the interiors of the two primary screen pipes is conveyed into the upper portion of the vertical section of the production sleeve through the end of the oil drawing pipe and the secondary screen pipe on the horizontal section of the oil drawing pipe respectively, and then subsection extraction of a horizontal well is achieved.