Advanced drill string inground isolator housing in an MWD system and associated method

• US 10,329,895 B2
• Filed: 08/08/2016
• Issued: 06/25/2019
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Merlin Technologies Incorporated
• Original Assignee: Merlin Technologies Incorporated
• Inventors: Chau, Albert W., Theimer, Kenneth J.
• Primary Examiner(s): Wright, Giovanna C
• Application Number:
  US15/231,750
• Publication Number:
  US 20160348495A1
• Time in Patent Office: 1,051 Days
• CPC Class Codes: E21B 17/003 with electrically conducting or insulating means E21B17/028 and E21B17/023 take precedence
• CPC Class Codes: E21B 47/01 Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
• CPC Class Codes: E21B 47/013 Devices specially adapted for supporting measuring instruments on drill bits
• CPC Class Codes: E21B 47/017 Protecting measuring instruments
• CPC Class Codes: E21B 47/024 of devices in the borehole determining slope or direction of the borehole E21B47/022
• CPC Class Codes: E21B 7/046 horizontal drilling drilling with mechanical conveying means E21B7/003

Abstract

A housing defines a through passage along its length and is configured to support a group of electrical isolators surrounding the through passage to form an electrically isolating break in a drill string such that each isolator of the group of isolators is subject to no more than a compressive force responsive to extension and retraction of the drill string. The housing defines a housing cavity to receive an electronics package having a signal port and is configured for electrical connection of the signal port across the electrically isolating break. A housing lid can cooperate with a main housing body to define elongated slots for purposes of enhancing the emanation of a locating signal. A housing arrangement can support electrical connections from an electronics package to bridge an electrically isolating gap.

Claims

1. A housing arrangement for use as part of an inground tool for receiving a transmitter to transmit a locating signal from the inground tool, said housing arrangement comprising:

a main housing for supporting the transmitter in an operating position while emanating the locating signal; and

a lid configured for removable installation on the housing such that at least a portion of the main housing and a portion of the lid are disposed in a confronting relationship to cooperatively define at least one elongated slot leading from an exterior of the housing arrangement to the transmitter with the transmitter received in the housing.

2. The housing arrangement of claim 1 wherein the main housing and lid cooperate to define an opposing pair of elongated slots each of which leads from the exterior of the housing to the transmitter with the transmitter received in the housing.

3. The housing arrangement of claim 2 wherein said lid defines a lid slot between the opposing pair of elongated slots.

4. The housing arrangement of claim 1 wherein the main housing includes an elongation axis and said slot is parallel with the elongation axis.

5. A housing for use as part of an inground tool for supporting an electronics package having an output cable for carrying an output signal, said housing comprising:

a housing body that is electrically conductive and defines a cavity for receiving said electronics package such that the electronics package forms a first electrical connection to the housing body; and

an intermediate housing that is electrically conductive and which is receivable on one end of the housing body to cooperate with the housing body in a way that forms an electrical isolation gap between the intermediate housing and the housing body, and the intermediate housing forms a second electrical connection with said cable such that the electronics package is electrically bridged across the gap.