FIELD: oil and gas industry.
SUBSTANCE: suggested invention relates to the filed of directional well drilling, in particular, to methods of control for directional drilling. The invention suggests the method for drilling trajectory control for the second well passing in direct vicinity to the first well, which includes passing of the first electrode connected to the first conducting wire through the casing string; placement of the return grounded electrode in the surface soil; generation of time-dependent electric current in the first conducting wire and the first electrode and the second conducting wire passing towards the return grounded electrode; formation of an electromagnetic field around the casing string of the first well induced by passing of time-dependent electric current in the first conducting wire; drilling of the second well against the drilling trajectory parallel to the first well; measurement of the electromagnetic field formed around the casing string of the first well from the drilling rig in the second well; and control of the second well trajectory with use of the measured electromagnetic field. At that the first electrode passes to an uncased borehole section, beyond the farthest end of the casing string so that the first conducting wire passes along the whole length of the casing string in the first well. Besides, distance between the first electrode and the casing string end should be sufficient for prevention of current passing from the first electrode upwards, through the casing string of the first well towards the return grounded electrode.
EFFECT: improving accuracy of the drilling trajectory control and levelling of one well in regard to another well.
10 cl, 7 dwg
