Irregular shaft cleaning and drifting device based on deflection angle flow dividing and drifting method
An irregular, well-passing technology, used in cleaning equipment, wellbore/well components, earth-moving drilling and other directions, can solve the problems of obstruction during tripping, low wellbore cleanliness, etc., and achieve improved and reduced cleanliness. The effect of a collapse accident
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[0028] (1) WY29-4HF well
[0029] 1) Borehole size: φ311.2mm
[0030] 2) The reason for the irregular well section: 764-986m, the air drilling process was used, and then it was converted to the conventional drilling fluid process. The hole expansion rate caused by the air drilling process was 10% higher than that of the conventional drilling fluid, so a pot belly occurred in this well section borehole. Drilling cuttings accumulate in the belly section, making it difficult to circulate out of the wellbore, which may easily cause downhole complications.
[0031] 3) Well drilling tool assembly: φ311.2mm cone bit + back pressure valve + 1 piece of 203.2mm helical drill collar + well body + 5 pieces of 203.2mm helical drill collar + 15 pieces of 139.7mm heavy drill pipe + 139.7mm drill pole.
[0032] 4) Drilling process: Drill down to the depth of the well, adopt the method of active reaming to the depth of 986m, and circulate the cuttings.
[0033] 5) Condition of the wellbore...
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