The foam may be generated at the surface or in a wellbore.

A process for fracturing a subterranean formation below an earthen surface in fluid communication with a wellbore.

The present invention provides methods and apparatus for cutting tubulars in a wellbore.

A Kelly bushing and rotary table (36) rotate the drill string; and an injector head (28) is used to insert the drill string through the Kelly bushing and rotary table and into a wellbore (40).

The hydraulic pump operates a slip assembly to fix the downhole apparatus within the wellbore prior to operation of the cutting tool.

The size of the protruding leg have to be at the least two-thirds of the depth of the shelf.

Only the mosque and the school are said to be still standing; even the borehole and its water tank were reportedly shot and destroyed.

After the fluid is mixed and foamed, it is injected into the formation via the wellbore at a pressure sufficient to induce at least one hydraulic fracture in the formation.

A lower density fracturing fluid is injected into an upper zone (12) of the formation via an annulus (20) of a perforated wellbore (10, 16) communicating with the upper zone (12) thereby causing a fracture (26) to propagate.

A fully functioning borehole providing clean water leads to better health and fewer visits to health centres.

Thus, usage of a well collecting rainwater, or the utilization of a fertilizer rich in Sulphur on crops are two hazardous practices for Copper and Selenium deficiencies (Arthington, 2003).

The foam may be generated at the surface or in a wellbore.

Methods of drilling a well bore in a subterranean formation comprising placing a self-degrading kickoff plug or the like in the well bore are provided.

A process for fracturing a subterranean formation below an earthen surface in fluid communication with a wellbore.

The present invention provides methods and apparatus for cutting tubulars in a wellbore.