Method for freeing stuck drill pipe

Details Method for freeing stuck drill pipe Method for freeing stuck drill pipe

1980-05-20

1982-07-27

Pate, III, William F.

Boring or penetrating the earth

Processes

Boring with specific fluid

175317, 166301, E21B 3100

Patent

active

043412726

ABSTRACT:
This invention relates to a valve assembly (drawing) which will hereafter be referred to as drill pipe freer, comprising a metal ball, hollow in the center, and of such design that it will float in liquid, or a floating solid plastic ball of such design and hardness to withstand the pressures to be encountered during operation of the invention, and a specially designed valve body with seat for the metal or plastic ball. The said valve body will be pumped down inside the string of drill pipe and collars within the well bore to anchor at drilling bit at lower end of drill pipe string. The said metal or plastic ball is then pumped down to seat itself within the said valve body seat, closing off the mud circulation (drilling fluid) which normally flows through drill pipe and out drilling bit and back up annulus of well bore. This sudden cessation of downward flow of drilling fluid will provide a water hammer blow to dislodge drill pipe lodged in off-bottom positions within well bore.

REFERENCES:
patent: 3053322 (1962-09-01), Kline
patent: 3195660 (1965-07-01), McKown
patent: 3213941 (1965-10-01), Nelson
patent: 3554281 (1971-01-01), Ecner
patent: 4241797 (1980-12-01), Allen
patent: 4252196 (1981-02-01), Silberman et al.

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