DRILL STRING ELEMENT Russian patent published in 2019 - IPC E21B7/04 E21B17/00 E21B21/00 E21B17/10 E02F5/18 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to horizontal or directional drilling for well development along drilling route. Drilling string element for embedding into drill string for well development along drilling route, made with pipe-shaped main part with two-way connecting elements for connecting a drill string element to a drill string and having an inner space providing transportation of drilling fluid for flushing the well and for carrying out drill cuttings separated by a drilling string connected to a drill string, with at least one hole connected to inner space in the wall of the main part, by means of which at least part of the drilling fluid flowing through the inner space gets into the annular space between the well wall and the main part. On the external wall above the hole there is at least one body, in which the flow channel is at least partially located, wherein flow channel has at least one flow path and is hydraulically connected to opening by means of inlet opening, and wherein flow channel on its side facing from hole has at least one outlet hole, and wherein the opening and/or inlet opening cross-section is smaller or larger than the outlet opening cross-section. Outlet hole is located substantially on one axis with mid axis of drill string element. Drill string is a column for horizontally directed drilling (HDD), the hole cross-section of the hole or the inlet opening and the outlet hole is adjustable, for that in at least two of the number of the hole and the inlet hole within the flow channel and/or outlet hole. In each case there is at least one nozzle and/or throttle washer. At that, at least two nozzles and/or throttling washers are replaceable with the possibility of selecting a nozzle or throttle washer so that at the installation point of the drill string element in the located in drilling well, drilling fluid enters the annular space in each case with specified volume flow rate and/or pressure set (-s) depending on geological properties of nearby rock.

EFFECT: technical result is the drilling fluid aspiration along the well bottom.

9 cl, 7 dwg