MECHANICAL DIRECTIONAL DRILLING JAR

Brand	Owner (click to sort)	Address	Description
DNT	WEATHERFORD TECHNOLOGY HOLDINGS	2000 St. James Place Houston TX 77056	MECHANICAL DIRECTIONAL DRILLING JAR;
DNT	Dailey International Inc	2507 North Frazier Conroe TX 77303	MECHANICAL DIRECTIONAL DRILLING JAR;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

Method and apparatus for drilling a directional or horizontal wellbore in a hydrocarbon formation using concentric drill string having an inner pipe and an outer pipe defining an annulus there between. A bottomhole assembly comprising a directional drilling means such as an air hammer or a rotary drill bit and driving system is provide at the lower end of the concentric drill string and drilling medium is delivered through the annulus or inner pipe for operating the directional drilling means to form a borehole. Exhaust drilling medium, drilling cutting and hydrocarbon are removed from the wellbore by extracting the exhaust drilling medium, drilling cutting and hydrocarbon through the other of the annulus or inner pipe.