| 摘要 |
The invention relates to mining, in particular to devices for drilling wells in strong and ultra-strong rocks. A drill rig for drilling wells that includes a string (1) of drill pipes (2) that includes a rock-destructive instrument (3), arranged with continuous flow openings (4) for outlet of washing fluid, and hydro-vibrator (5) for transformation of stationary flow of washing fluid to pulsing flow, with inner cavitator (6) arranged as a nozzle the flow channel (7) of which includes a cylindrical section (8) with critical diameter Dcr., and reamed section-diffuser (9), and hollow body (10) placed after cavitator (6). According to the invention, in the continuous flow channel (7) of the cavitator (6), the length L of the cylindrical section (8) is L=0.5-2.0 of critical diameter Dcr., total area Sof the continuous flow openings (4) of the rock destruction instrument (3) is 7-10 larger than the area S of the cross section of the cylindrical section (8) of the continuous flow channel (7)of cavitator (6), the angle α of opening of the diffuser (9) of the continuous flow channel (7) of the cavitator (6), depending on technological parameters of drilling the well chosen is α=10-180, and at the upper end of the cavitator (6) stabilizer (11) of flow of washing fluid is installed, this is arranged as a bushing, there (11) inner diameter d is 2-3 critical diameters Dcr. of the cylindrical section (8) of cavitator (6), and the length Lis 10-15 of its (11) inner diameters d, at that the diameter Dof the hollow body (10) of the hydro-vibrator (5) is equal to the diameter Dof the output cross section of the diffuser (9)of cavitator (6), and the length Lof the hollow body (10) of the hydro-vibrator (5) is not less than 90-110 critical diameters Dcr. of the cylindrical section (8) of the cavitator (6). Technical result: decrease of power consumption and increase of productivity of the process of drilling, especially at drilling deep wells in strong and ultra-strong rocks. |
