What are the advantages and disadvantages of positive cycle well washing

Positive circulation well washing: the pump from the slurry pool will wash the well pressure into the drill pipe straight to the working face to flush the tool and the bottom of the well, after mixing with the drilling cuttings, the washing liquid will be discharged to the ground along the borehole, and the purified washing liquid will be returned to the slurry storage pool.

Advantages: Due to the high flow rate and high pressure of the washing fluid, it has strong flushing ability, which has good flushing effect on the tool and the bottom of the well, and reduces the chances of the drill cuttings to be broken repeatedly, and it can be used as a power source to make the drilling tools rotate.

Disadvantage: It can only be applied to small diameter drilling wells. The main reason is because of the problem of the upward return speed of the washing fluid. The larger the drilling diameter is, the slower the upward return speed is, and it tends to present a laminar flow state, which cannot carry the larger particles of drill cuttings.

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