FIELD: drill engineering. SUBSTANCE: column of heavy-weight drill pipes has basic pipe body of elliptic cross-section and with connecting threads 2 and central washing passage 3. The heavy-weight drill pipes are located in the column in such a way, that adjacent heavy-weight pipes are installed with a shift between similar axes of the ellipse in horizontal plane. The shift angle is determined by expression 
, where α is an angle between similar ellipse axes of the adjacent pipes in the column; n- is number of pipes in the column. EFFECT: more effective drilling. 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| ROTATION DRILL BIT | 1990 |
|
RU2049216C1 |
| DRILLING BIT | 1991 |
|
RU2012767C1 |
| METHOD FOR STABILIZING THE ROTATION AXIS OF DRILL STRING BOTTOM- HOLE ASSEMBLY | 0 |
|
SU1754875A1 |
| ARRANGEMENT OF BOTTOM PART OF DRILL STRING FOR DIRECTIONAL DRILLING | 0 |
|
SU1506056A1 |
| DOWNHOLE DRILL STRING ASSEMBLY FOR WELL DIRECTIONAL DRILLING | 1993 |
|
RU2082865C1 |
| DEVICE FOR INDEXING A DEFLECTOR | 0 |
|
SU1333768A1 |
| METHOD OF MEASURING PARAMETERS OF BOREHOLE CURVATURE | 0 |
|
SU1573153A1 |
| STABILIZER | 2000 |
|
RU2183250C2 |
| DEVICE FOR MEASURING WELL CROOKING PARAMETERS | 0 |
|
SU1452950A1 |
| METHOD OF SINKING OF DIRECTIONAL WELLS | 1990 |
|
RU2027842C1 |
