Flow control in subterranean wells

A method for use with a subterranean well, the method comprising:

• blocking flow through existing perforations in the well using flow conveyed plugging devices, wherein, prior to insertion into the well, each of the plugging devices includes a body and, extending outwardly from the body, at least one of the group consisting of lines and fibers, and wherein at least one member of the at least one of the group consisting of lines and fibers includes an end which is splayed outward, thereby making the end wider than a remainder of the member, and enhancing fluid drag during conveyance of the plugging devices by flow in the well;
• then perforating a first zone in the well;
• then releasing additional flow conveyed plugging devices into the well;
• and
• the additional flow conveyed plugging devices blocking flow through respective openings in the first zone.

A method for use with a subterranean well, the method comprising:

• perforating a first zone;
• releasing a first set of flow conveyed plugging devices into the well, wherein, prior to insertion into the well, each of the plugging devices includes a body and, extending outwardly from the body, at least one of the group consisting of lines and fibers, wherein at least one member of the at least one of the group consisting of lines and fibers includes an end which is splayed outward, thereby making the end wider than a remainder of the member and enhancing fluid drag during conveyance of the plugging devices by flow in the well;
• the first set of plugging devices blocking flow through respective perforations in the first zone;
• perforating a second zone after the flow blocking in the first zone;
• releasing a second set of the flow conveyed plugging devices into the well;
• and
• the second set of plugging devices blocking flow through respective perforations in the second zone.