| 摘要 |
FIELD: instrument making. ^ SUBSTANCE: invention describes a sequence of filters with narrow spots for balancing the flow via perforations in a basic pipe, which are arranged lower or higher along the flow direction of each narrow spot, which differs by a valve element inserted into holes, so that filters are closed for flow passage when lowered into the well. Pressure in the basic pipe may be, without necessity to introduce an inner column or a washing pipe, is increased to ensure operation of well equipment, installed below the filters, such as a downhole turbine motor, or on a perforated tail, such as a packer. Holes may be selectively opened, when appropriate equipment joined to basic pipes was used according to the intended purpose. The valve element may be involved to open by different ways, such as application of pressure, temperature or variation of well fluid properties. ^ EFFECT: provision of the possibility to keep inlet holes of filters as closed before putting them into operation, under guarantee of simultaneous transition of all holes into an open condition, when this is necessary. ^ 27 cl, 18 dwg |
