Patent ID: 6161632
Filing Date: 2000-12-19
Classification: E21B

Abstract:
An arrangement for flushing upwards into an annular space between a drill pipe or a drill stem, which is composed of several pipe sections, and a bore hole wall or between a drill pipe/drill stem and a lining pipe, in an underground well, where pressure liquid is led with an axial liquid flow so as to drive a drill head or a hydraulic sludge motor and where the pressure liquid is used in addition for flushing in the annular space, where a flushing member with nozzles is inserted in the drill pipe/drill stem, which is directed obliquely backwards in the annular space between the flushing member and the side walls of the bore hole, and where the flushing member forms a remotely controllable valve comprising two mutually slidable valve parts, whereinthe valve parts consists of an outer sleeve-formed valve part and an inner sleeve-shaped valve part, which are slidable directly under mutual support and connected directly to their respective sections of the drill pipe,the outer valve part forming a valve-seat member, in which the nozzles are designed in an annular series together with passages between the nozzles and valve openings in the valve seat member,the inner valve part forming a slide-formed valve body for opening and closing the valve openings, and whereinthat the valve parts are axially moveable a limited length of movement relative to each other by remote regulation of the tension loading in the drill pipe/drill stem, anda means for cushioning and balancing the axial movement of the valve parts relative to each other comprise pressure liquid chambers located between the valve parts.