Digging machine

Digging tool

Digging tooth and teeth arrayed in combination with endless...

Digital core workflow method using digital core images

Digital signal receiver for mwd telemetry systems

Diluent-enhanced in-situ combustion hydrocarbon recovery...

Dip determination by statistical combination of displacements

Direct combustion stimulation of a producing well

Direct connecting downhole control system

Direct contact low emission steam generating system...

Direct drive bit for deep well drilling tools

Direct drive for deep-well drilling

Direct fired conductive subterranean heating system

Direct firing downhole steam generator

Direct proportional surface control system for downhole choke

Direction control in well drilling

Direction control valve embodying a sleeve-like pressure...

Direction controllable subsurface borehole tool

Directional boring

Directional boring head