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    • 6. 发明申请
    • SELECTIVE ZONAL ISOLATION OF OIL WELLS
    • 选择性区域分离油井
    • WO1995000739A1
    • 1995-01-05
    • PCT/GB1994001358
    • 1994-06-23
    • SCHLUMBERGER CANADA LIMITEDCOMPAGNIE DES SERVICES DOWELL SCHLUMBERGER S.A.SOFITECH N.V.VERCAEMER, Claude, JosephDAVIES, Stephen, NigelPAFITIS, Demosthenis, GeorgeouMAITLAND, Geoffrey, ColinPOYET, Jean-Pierre
    • SCHLUMBERGER CANADA LIMITEDCOMPAGNIE DES SERVICES DOWELL SCHLUMBERGER S.A.SOFITECH N.V.
    • E21B33/13
    • E21B33/124E21B33/13E21B33/134E21B33/146E21B43/261
    • In the horizontal parts of deviated wells arranged within a producing formation, good communication between the formation and the wellbore liner is required, and this may be achieved by using a slotted or perforated liner in the horizontal section without any cementing to bond the liner to the wellbore. However, problems can arise if it is desired to work selectively in a zone in the horizontal section, since with a perforate liner there is no way of isolating the zone from the remainder of the well by using internal packers. This problem can be overcome by providing packers around the outside of the liner; this then allows packers inside the liner to be used to isolate a portion of the well. However, these external casing packers must be sealed against the wellbore, they must be positioned in advance, and they substantially increase the cost of the completion. The present invention suggests novel means of zonal isolation in a well with a perforate liner, this isolation being achieved by using a liquid composition that can be pumped into the relevant annular region between the liner and the wellbore and then set to form a plug that prevents communication from one side to the other except via the liner. More specifically, the invention provides a method of placing a plug around a perforate liner in which: a pair of spaced packers (14, 16) are placed inside the liner (12) to define both a chamber (20) inside the liner which includes a perforation (22) and also a region (24) to be plugged outside the liner; a predetermined volume of plugging fluid is pumped into the chamber and, via the perforation, into the region to be plugged; and after the plugging fluid has set the packers are removed from the liner.
    • 在布置在生产地层内的偏斜井的水平部分中,需要地层和井筒衬套之间的良好的连通性,这可以通过在水平部分中使用开槽或穿孔的衬套来实现,而不需要任何胶结来将衬套粘结到 井筒。 然而,如果希望在水平部分的区域中选择性地工作,则可能会出现问题,因为使用穿孔衬套,通过使用内部封隔器,无法将该区域与井的其余部分隔离。 通过在衬套的外侧提供封隔器可以克服这个问题; 这样就可以使用衬垫内的封隔器来隔离井的一部分。 然而,这些外壳式封隔器必须密封在井眼上,所以它们必须预先定位,并且大大增加了完井的成本。 本发明提出了在具有穿孔衬套的井中的区域分离的新方法,该隔离是通过使用可以泵入衬垫和井筒之间的相关环形区域中的液体组合物来实现的,然后设置成形成防止 从一边到另一边的通信,除了通过班轮。 更具体地,本发明提供了一种将塞子放置在穿孔衬套周围的方法,其中:一对间隔开的封隔器(14,16)放置在衬套(12)内部,以限定衬套内部的室(20),其包括 穿孔(22)以及要封装在衬垫外部的区域(24); 将预定体积的堵塞流体泵送到腔室中,并通过穿孔进入待堵塞的区域; 并且在堵塞流体已经设置之后,将封隔器从衬垫上移除。