CEMENTING METHOD OF WELL Russian patent published in 2020 - IPC E21B33/14 E21B28/00 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to drilling, namely to improving quality of cementing of casing strings, equipment and technology of completion and operation of wells. Cementing method involves well preparation, lowering of casing string, tying of well head with cementing head, flushing of well, injection of grouting mortar. A pulse-wave action device is connected to the cementing head. It includes drill hose with installed on it gate valve, emitter of power waves, hydraulic hammer, pipelines for supply and discharge of oil and air, compressor, pump station and control device. Control device provides change of pulse-wave action mode taking into account rheological conditions of cementing process. Valve is opened immediately after grouting fluid is poured into casing pipes. Control device, pump station and compressor are started. Cement mortar is subjected to pulse-wave action. After completion of grouting mortar pouring and achievement of preset level in annular space, additional pulse-wave action is applied to backfill solution in casing string and borehole space. After the pulse-wave action is completed, further work is performed according to the cementing program.

EFFECT: higher efficiency of cementing due to improved structure and homogeneity of cement mortar, which improve quality of cementing of wells at simultaneous simplification of technical implementation of completion and operation of wells.

1 cl, 1 dwg