Electric field borehole telemetry
First Claim
1. An apparatus to measure electric fields in a borehole, comprising insulative drill collars in an electrically conductive drillstring and there being insulated wireline means which is electrically connected lengthwise across said insulated drill collars, via upper and lower electrical connections, there being generating means including pulser means to generate said electric fields, there being upper and lower instrument housings associated with said electrical connections which are in part located within said housings, said housings supported within the drill string, the upper housing projecting above at least one of the insulating drill collars, and the lower housing projecting below said one insulating collar, said pulser means located within one of the housings.
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Accused Products
Abstract
An apparatus for borehole electric field telemetry includes a source of modulated voltage or current, at least one axially extending collar collar connected between pipe sections in a pipe string, and a system of insulated wireline components providing electrical connections, insulated from drilling fluids, between the ends of the one or more aforementioned insulative collars in the pipe string, to transmit the voltage or current. The source of modulated voltage or current comprises an electrical pulse-producer for producing short duration pulse wave forms selected to obtain optimum transmission characteristics in the underground formation. The electrical connections are to the drillstring, and there are upper and lower instrument housings associated with the electrical connections, which are upper and lower connections. The housings are supported within the pipe string, the upper housing located above at least one of the insulative collars, and the lower housing projecting below the insulative collar. The pulse-producing means is located within at least one of such housings.
131 Citations
13 Claims
- 1. An apparatus to measure electric fields in a borehole, comprising insulative drill collars in an electrically conductive drillstring and there being insulated wireline means which is electrically connected lengthwise across said insulated drill collars, via upper and lower electrical connections, there being generating means including pulser means to generate said electric fields, there being upper and lower instrument housings associated with said electrical connections which are in part located within said housings, said housings supported within the drill string, the upper housing projecting above at least one of the insulating drill collars, and the lower housing projecting below said one insulating collar, said pulser means located within one of the housings.
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13. An apparatus for borehole electric field telemetry having an electrical pulse producing means for producing short duration pulse wave forms, at least one insulative collar connected between pipe string sections, upper and lower housings for elements of upper and lower electrical connections to the pipe string, the upper housing being located above the insulative collar and the lower housing located below the collar, the upper and lower housings supported within the pipe string, and the pulse producing means located within at least one of the housings.
Specification