Title: Drilling tool

Abstract: A drilling tool connected in a drilling string includes a pressure responsive rotatable ball valve for enabling drilling fluid flow down the bore of a drill string which automatically rotates closed for blocking flow through the bore of the drill string when incipient pressure conditions indicate the direction of flow through the bore may be reversed. Means for releasably locking the ball in the open position in response to a preselected directional pressure to enable the running of other tools and the like through the bore of the drilling string are provided. The drilling tool may be employed for controlling an undesired flowing stream of fluid from the bore of the drilling string by stabbing the tool to connect with the drilling string utilizing a stabbing member which is removed after connecting to enable the ball valve to rotate closed to control the flowing stream.

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Inventors: Mott, James D. (Houston, TX, US)

Application Number: 403204
Filing Date: 1973-10-03
Publication_date: 1976-02-17
Assignee: Hydril Company (Houston, TX)
Primary Class(es): 166/325 175/242
Other Classes:
US Patent Ref:

2874718	Feb, 1959	Kelly	137/469.
3035808	May, 1962	Knox	166/224.
3200837	Aug, 1965	Brown	166/224.
3605793	Sep, 1971	Kinsel	137/516.
3667557	Jun, 1972	Todd	175/38.
3696868	Oct, 1972	Taylo, Jr.	166/224.
3741249	Jun, 1973	Leutwyler	166/224.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner:
Attorney: Pravel & Wilson