WELL CONSTRUCTION METHOD Russian patent published in 2024 - IPC E21B7/20 E21B33/04 E21B43/10 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to oil industry, namely to method of well construction, and in particular to method of drilling and fixation of direction. Method of well construction includes drilling of well shaft for direction, lifting of drilling tool, lowering of pipe string from at least one pipe under direction with exclusion of contact of pipe bottom to well bottom, fixation of pipe string from axial movement, alignment of the upper part of the direction relative to the well, pumping of cement mortar until its exit from the annular space. After drilling the well and lifting the drill pipes with the drilling tool, the wellhead is equipped with a fixed support with a central hole, and the said hole and the well are aligned. Before lowering of the last pipe string, its coupling is equipped from above with a sub with a coupling, and a drilling fork is put on the sub below its coupling. Pipe string is lowered until the sub collar is fitted on the drill fork, and the drill fork is placed on the fixed support. At the end of lowering of the directional pipe string, coaxial arrangement of the top of the direction pipe string and the well is provided with a drilling fork when it is installed symmetrically relative to the central hole of the fixed support. Cement slurry is pumped through sub with coupling. After cementing of the pipe string, cement hardening is expected and the sub is dismantled.

EFFECT: reduced probability of misalignment of pipe string relative to well and reduced duration of well direction construction.

1 cl, 3 dwg