US2096359A - Apparatus for subsurface surveying - Google Patents

Apparatus for subsurface surveying Download PDF

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Publication number
US2096359A
US2096359A US59096A US5909636A US2096359A US 2096359 A US2096359 A US 2096359A US 59096 A US59096 A US 59096A US 5909636 A US5909636 A US 5909636A US 2096359 A US2096359 A US 2096359A
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Prior art keywords
connecter
contact
drill
bit
insulation
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Expired - Lifetime
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US59096A
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David G Hawthorn
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Geophysical Research Corp
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Geophysical Research Corp
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/028—Electrical or electro-magnetic connections
    • E21B17/0285—Electrical or electro-magnetic connections characterised by electrically insulating elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
    • G01V3/20—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current

Definitions

  • This invention relates. to apparatus for subsurface surveying.
  • the drill bit of a standard boring machine is used as an electrode for passing electricity into the earth at the bottom of a bore hole in order to test the electrical resistance of the formation in which the bit is operating to determine the nature of such formation.
  • An object of this invention is a drill stem incorporating an insulated conductor designed to carry electricity to the drill bit.
  • a drill stem embodying the invention consists as usual of a number of lengths of pipe joined end to end by the usual male and female connecters at the ends of the lengths of pipe.
  • each connecter is an insulated electrical contact which is adapted to be engaged by a contact in a connecter of the opposite type upon union oi said connecters.
  • a small conduit is fixed to the inner periphery of the pipe and through it passes an insulated electrical conductor having its ends connected to said contacts.
  • a drill collar which is electrically insulated internally and externally, is interposed between the bottom connecter of the drill stem and the drill bit thus allowing the bit to function as an electrode and is provided with an electrical contact to engage the electrical Acontact in said bottom connecter.
  • Fig. 1 is a diagrammatic view of a drill stem embodying the invention
  • Fig. 2 is an elevation of one section of the drill stem connected at either end to other sections;
  • Fig. 3 is a longitudinal section through the bit and collar by which it is connected tothe drill stem; s l
  • Fig. 4 is a longitudinal view of a male and female connecter in position to be coupled
  • Fig. 5 is a similar view with the connecters coupled
  • Fig. 6 is a transverse section on the line 6-6 of Fig. 5;
  • Fig. 7 is an enlarged fragmentary view of the contacts in the male and female connecters in posltion'about to be engaged;
  • Fig. 8 is a view similar to Fig. 'i with the contacts in engagement, and
  • Fig. 9 is an elevation of the female connecter contact.
  • the drill stem consists of a series of pipe lengths liljointed together by couplers or tool joints II with a drill collar I2 attached to the bottom length and being in turn attached to the drill bit I3.
  • Each coupler II consists of a maleV connecter I4 and a female ccnnecter I5 which are permanently secured to the pipe lengths Ill and which are provided with cooperating tapered screw-threaded portions by engagement of which the two connecters are joined to form a coupler II, such coupler construction being ofthe standard type now in general use and known as a tool joint.
  • a contact I6 In the bore of the male connecter is provided a contact I6 and in the bore of the female connecter is provided a contact I'I.
  • the contact I6 comprises a metal ring enclosed with insulation such as rubber except along its upper edge.
  • the insulation covered contact is mounted in a split sleeve I8 which rests against a shoulder in the connecter bore and has a force fit in said b'ore.
  • the contact I'I consists of a metal helix terminating at each end in an annulus, the contact being completely enclosed with insulation such as rubber except along its bottom edge.
  • the upper end of the insulation covered contact I'I is mounted in a split sleeve I9 which bears against 'a shoulder in the connecter bore and has a force t therein.
  • 'I'he insulation on the connecter I6 extends beyond the uncovered edge of the contact to form an annular channel.
  • 'I'he insulation on the contact I'I tapers at the lower edge thereof to form a wedge which is received in the channel at the upper edge of the contact I 6.
  • the taper of the walls of the channel is less than the taper of the wedge so that the walls of the channel are sprad upon engagement of the wedge in the channel to insure eective insulation of the contacts I6 and I'I along the meeting edges thereof.
  • a conduit 2l extends longitudinally of each length of pipe l0 and is brazed or otherwise connected permanently to the inner periphery of the pipeI
  • An insulated electrical conductor 25 extends through the conduit 20 and is electrically connected at one end to contact I6 and at the opposite end to a contact I1.
  • and the inner wall of the conduit 20 may be lied with any suitable plastic material to hold the conductor rmly in place.
  • the drill bit Il is' of standard construction and is provided with a screw-threaded boss 22 which projects into the screw-threaded box at the lower end of the drill collar I2.
  • 'I'he bore of the drill collar is provided with a liner ⁇ 23 of insulating material and is surrounded by a sleeve 24 of insulating material such, for example, as bakellte.
  • the upper end of the sleeve 2l is screw-threaded and extends into the screw-threaded box of a connecter Ila which is provided with a contact I6 from which an insulated conductor Ila leads to the upper end of the drill collar l2.
  • a ring 2l of insulating material is interposed between the upper end of the drill collar I2 and a shoulder in the bore of the connecter Ila.
  • the surface of the drill collar is roughened in any suitable manner, such as knurling, to prevent slippage of the sleeve 2l on the drill collar.
  • a drill stem made in accordance with the invention the usual mixture of mud and water is forced through the central bore and out the discharge ducts I3a in the bit in the -usual manner, the cylindrical shape of the contacts I6 and i1 and their supporting members permitting free flow of such liquid.
  • the top length of pipev I is connected in the usual manner to the standard Kelly joint 2l which is associated in the usual manner with a rotating drive wheel 29.
  • the Kelly joint 2l is provided with a suitable electrical contact (not shown) which engages the top connecter Ii and is. connected by any suitable collector ring and brush arrangement with the positive terminal of a battery B through an ammeter or ohm meter M, the negative terminal of the battery being grounded. Electrical energy.
  • I'he bit thus acts as a disspatingY electrode and from readings observed on the ammeter or ohm meter, variations in the resistance of the' sub-surface formation may be determined, thereby giving indication of the character of the formation.
  • drill stem may be drawn up and disconnected in the usual manner for the purpose of replacing the bit and without any precaution having to be taken with respectto the electrical connections.
  • a drill stem section comprising a length of pipe, a conduit fixed to the inner periphery thereof, male and female threaded connecters at opposite vends of said pipe, a metal annulus rigidly supported in one connecter, a metallic helical member supported in the other connecter and terminating in a second annulus, said first annulus and saidhelical member being coated with electrical insulation except for an edge of each annulus, the annulus of each connecter being effective to be engaged by an annulus in a connecter of the opposite type upon union of said connecters, ⁇ and an insulated electrical conductor passing through said conduit and having its ends connected to said contacts.
  • a drill stem section according to claim 1 in which the insulation for one annulus extends beyond the exposed edge thereof to form a tapered trough. and the insulation for the other annulus tapers to the exposed edge thereof to form a wedge.
  • a drill stern section according to claim 1 in which the insulation for one annulus extends beyond the exposed edge thereof to form a tapered trough and the insulation forthe other annulus tapers to the exposed edge thereof to form a wedge, the taper of the trough being different than the taper of the wedge.

Description

Oct, 19, 1937. D. G. HAw'rHoRN APPARATUS FOR SUBSURFACE SURVEYING 2 Sheets-Sheet 1 INVENTOR xga/w13 MM ATTORNEYS ///////////////////,V/l//f/ Filed Jan. 14. 1936 WIT Oct. 19, 1937. D. s. HAwTHoRN APPARATUS FOR SUBSURFACE SURVEYING Filed Jan. 14, 1936 2 Sheets-Sheet 2 Ww III/ ATTORNEYS INVENTOR www Patented Oct. 19, 1937. i
APPARATUS FOB SUBSURFACE SURVEYING David G. Hawthorn, Tulsa, Okla., miglior to Geophysical Research Corporation,
N ew K York,
N. Y., a corporation of New Jersey Application January 14, 193B, Serial'No. 59,096
3Claims.
This inventionrelates. to apparatus for subsurface surveying.
In a recently developed method of exploring sub-surface formations, the drill bit of a standard boring machine is used as an electrode for passing electricity into the earth at the bottom of a bore hole in order to test the electrical resistance of the formation in which the bit is operating to determine the nature of such formation. An object of this invention isa drill stem incorporating an insulated conductor designed to carry electricity to the drill bit.
A drill stem embodying the invention consists as usual of a number of lengths of pipe joined end to end by the usual male and female connecters at the ends of the lengths of pipe. In each connecter is an insulated electrical contact which is adapted to be engaged by a contact in a connecter of the opposite type upon union oi said connecters. A small conduit is fixed to the inner periphery of the pipe and through it passes an insulated electrical conductor having its ends connected to said contacts. A drill collar which is electrically insulated internally and externally, is interposed between the bottom connecter of the drill stem and the drill bit thus allowing the bit to function as an electrode and is provided with an electrical contact to engage the electrical Acontact in said bottom connecter. With this arrangement, the connecting together of the several lengths of pipe in the usual manner automatically builds up an insulated electrical path from the top of the drill stem to the drill bit. The normal procedure in increasing the length of the drill stem as the depth of the bore increases or in removing the drill stem for replacement of .the bit is in no way interfered with by the arrangement for conducting electricity to the drill bit.
Other objects, novel features and advantages of this invention will become apparent from the following speciiication and accompanying drawings, wherein:
Fig. 1 is a diagrammatic view of a drill stem embodying the invention;
Fig. 2 is an elevation of one section of the drill stem connected at either end to other sections;
Fig. 3 is a longitudinal section through the bit and collar by which it is connected tothe drill stem; s l
Fig. 4 is a longitudinal view of a male and female connecter in position to be coupled;
Fig. 5 is a similar view with the connecters coupled;
Iv l i wf (Cl. Z55-28) Fig. 6 is a transverse section on the line 6-6 of Fig. 5;
Fig. 7 is an enlarged fragmentary view of the contacts in the male and female connecters in posltion'about to be engaged;
Fig. 8 is a view similar to Fig. 'i with the contacts in engagement, and
Fig. 9 is an elevation of the female connecter contact.
As shown in Fig. l, the drill stem consists of a series of pipe lengths liljointed together by couplers or tool joints II with a drill collar I2 attached to the bottom length and being in turn attached to the drill bit I3. Each coupler II consists of a maleV connecter I4 and a female ccnnecter I5 which are permanently secured to the pipe lengths Ill and which are provided with cooperating tapered screw-threaded portions by engagement of which the two connecters are joined to form a coupler II, such coupler construction being ofthe standard type now in general use and known as a tool joint.
In the bore of the male connecter is provided a contact I6 and in the bore of the female connecter is provided a contact I'I. The contact I6 comprises a metal ring enclosed with insulation such as rubber except along its upper edge. The insulation covered contact is mounted in a split sleeve I8 which rests against a shoulder in the connecter bore and has a force fit in said b'ore. The contact I'I consists of a metal helix terminating at each end in an annulus, the contact being completely enclosed with insulation such as rubber except along its bottom edge. The upper end of the insulation covered contact I'I is mounted in a split sleeve I9 which bears against 'a shoulder in the connecter bore and has a force t therein. 'I'he insulation on the connecter I6 extends beyond the uncovered edge of the contact to form an annular channel. 'I'he insulation on the contact I'I tapers at the lower edge thereof to form a wedge which is received in the channel at the upper edge of the contact I 6. The taper of the walls of the channel is less than the taper of the wedge so that the walls of the channel are sprad upon engagement of the wedge in the channel to insure eective insulation of the contacts I6 and I'I along the meeting edges thereof. A conduit 2l) extends longitudinally of each length of pipe l0 and is brazed or otherwise connected permanently to the inner periphery of the pipeI An insulated electrical conductor 25 extends through the conduit 20 and is electrically connected at one end to contact I6 and at the opposite end to a contact I1. The space between the conductor 2| and the inner wall of the conduit 20 may be lied with any suitable plastic material to hold the conductor rmly in place.
The drill bit Il is' of standard construction and is provided with a screw-threaded boss 22 which projects into the screw-threaded box at the lower end of the drill collar I2. 'I'he bore of the drill collar is provided with a liner `23 of insulating material and is surrounded by a sleeve 24 of insulating material such, for example, as bakellte. The upper end of the sleeve 2l is screw-threaded and extends into the screw-threaded box of a connecter Ila which is provided with a contact I6 from which an insulated conductor Ila leads to the upper end of the drill collar l2. A ring 2l of insulating material is interposed between the upper end of the drill collar I2 and a shoulder in the bore of the connecter Ila. The surface of the drill collar is roughened in any suitable manner, such as knurling, to prevent slippage of the sleeve 2l on the drill collar.
In a drill stem made in accordance with the invention, the usual mixture of mud and water is forced through the central bore and out the discharge ducts I3a in the bit in the -usual manner, the cylindrical shape of the contacts I6 and i1 and their supporting members permitting free flow of such liquid. The top length of pipev I is connected in the usual manner to the standard Kelly joint 2l which is associated in the usual manner with a rotating drive wheel 29. The Kelly joint 2l is provided with a suitable electrical contact (not shown) which engages the top connecter Ii and is. connected by any suitable collector ring and brush arrangement with the positive terminal of a battery B through an ammeter or ohm meter M, the negative terminal of the battery being grounded. Electrical energy. is thus supplied to thedrill blt and the major part of the electrical current is discharged from the bit into the sub-surface formation at the bit blade as the best contact is at this point. I'he bit thus acts as a disspatingY electrode and from readings observed on the ammeter or ohm meter, variations in the resistance of the' sub-surface formation may be determined, thereby giving indication of the character of the formation.
As the bore increases in depth, additional sections may be added to the drill stem in the usual manner merely by disconnecting the Kelly joint from the top length of pipe, inserting the addi-v tional section and connecting the Kelly joint to the top end of the added section. The drill stem may be drawn up and disconnected in the usual manner for the purpose of replacing the bit and without any precaution having to be taken with respectto the electrical connections.
In joining together the male and female connecters at the ends of two sections ofy pipe, it is necessary only to project the male section into the female section until the threads engage and then effect slight relative rotation thereof to couple the connecters firmly together.` 'I'he exposed edges of the contacts i6 and I1 will be brought into engagement at about the'same time that the threads of the connecters engage each other and in the final coupling together of the connecters the edges will be in sliding contact as the connecters are rotated into tight coupling engagement. The contact I'l is sulciently resilient to be slightly compressed during the coupling operation while exerting sumcient pressure to insure good electrical conductive engagement between the edges of the contacts. The overall insulation of the contacts prevents any leakage of electrical energy, thus insuring a highly conductive electrical path from the top to the bottom of the drill stem. a
I claim:
1. A drill stem section comprising a length of pipe, a conduit fixed to the inner periphery thereof, male and female threaded connecters at opposite vends of said pipe, a metal annulus rigidly supported in one connecter, a metallic helical member supported in the other connecter and terminating in a second annulus, said first annulus and saidhelical member being coated with electrical insulation except for an edge of each annulus, the annulus of each connecter being effective to be engaged by an annulus in a connecter of the opposite type upon union of said connecters,` and an insulated electrical conductor passing through said conduit and having its ends connected to said contacts.
2. A drill stem section according to claim 1 in which the insulation for one annulus extends beyond the exposed edge thereof to form a tapered trough. and the insulation for the other annulus tapers to the exposed edge thereof to form a wedge.
3. A drill stern section according to claim 1 in which the insulation for one annulus extends beyond the exposed edge thereof to form a tapered trough and the insulation forthe other annulus tapers to the exposed edge thereof to form a wedge, the taper of the trough being different than the taper of the wedge.
DAVID G. IIAWTHORN.
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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690934A (en) * 1950-08-28 1954-10-05 Samuel M Holcombe Insulated sucker rod and tubing to prevent electrolysis and corrosion
US3057409A (en) * 1958-12-31 1962-10-09 Texaco Inc Well casing
US3170137A (en) * 1962-07-12 1965-02-16 California Research Corp Method of improving electrical signal transmission in wells
US3253245A (en) * 1965-03-05 1966-05-24 Chevron Res Electrical signal transmission for well drilling
US3696332A (en) * 1970-05-25 1972-10-03 Shell Oil Co Telemetering drill string with self-cleaning connectors
US4001774A (en) * 1975-01-08 1977-01-04 Exxon Production Research Company Method of transmitting signals from a drill bit to the surface
US4098342A (en) * 1977-05-25 1978-07-04 Exxon Production Research Company Method and apparatus for maintaining electric cable inside drill pipe
DE2744829A1 (en) * 1977-10-05 1979-04-19 Shell Int Research Drill pipe section with non:obstructive electrical connection - formed by spiralling protective tube on inside walls (OE 15.11.78)
US4220381A (en) * 1978-04-07 1980-09-02 Shell Oil Company Drill pipe telemetering system with electrodes exposed to mud
EP0076801A1 (en) * 1981-01-30 1983-04-20 Tele-Drill Incorporated Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
EP0090800A1 (en) * 1981-10-01 1983-10-12 Exploration Logging Inc Well logging apparatus and method for making same.
US4823125A (en) * 1987-06-30 1989-04-18 Develco, Inc. Method and apparatus for stabilizing a communication sensor in a borehole
WO1992004525A1 (en) * 1990-09-07 1992-03-19 Framo Developments (Uk) Limited Pipe system with electrical conductors
US6123561A (en) * 1998-07-14 2000-09-26 Aps Technology, Inc. Electrical coupling for a multisection conduit such as a drill pipe
US20060225926A1 (en) * 2005-03-31 2006-10-12 Schlumberger Technology Corporation Method and conduit for transmitting signals
US20070063865A1 (en) * 2005-09-16 2007-03-22 Schlumberger Technology Corporation Wellbore telemetry system and method
US20070159351A1 (en) * 2005-12-12 2007-07-12 Schlumberger Technology Corporation Method and conduit for transmitting signals
US20070188344A1 (en) * 2005-09-16 2007-08-16 Schlumberger Technology Center Wellbore telemetry system and method
US20080041575A1 (en) * 2006-07-10 2008-02-21 Schlumberger Technology Corporation Electromagnetic wellbore telemetry system for tubular strings
US20100099835A1 (en) * 2008-10-22 2010-04-22 Stokes Casey D Production of Vinylidene-Terminated and Sulfide-Terminated Telechelic Polyolefins Via Quenching with Disulfides
US8049506B2 (en) 2009-02-26 2011-11-01 Aquatic Company Wired pipe with wireless joint transceiver
US8851175B2 (en) 2009-10-20 2014-10-07 Schlumberger Technology Corporation Instrumented disconnecting tubular joint
US20150152726A1 (en) * 2012-07-20 2015-06-04 China National Petroleum Corporation Information transmission apparatus for logging while drilling
WO2017054046A1 (en) * 2015-09-29 2017-04-06 Cmte Development Limited System and method for monitoring earth composition while drilling boreholes

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690934A (en) * 1950-08-28 1954-10-05 Samuel M Holcombe Insulated sucker rod and tubing to prevent electrolysis and corrosion
US3057409A (en) * 1958-12-31 1962-10-09 Texaco Inc Well casing
US3170137A (en) * 1962-07-12 1965-02-16 California Research Corp Method of improving electrical signal transmission in wells
US3253245A (en) * 1965-03-05 1966-05-24 Chevron Res Electrical signal transmission for well drilling
US3696332A (en) * 1970-05-25 1972-10-03 Shell Oil Co Telemetering drill string with self-cleaning connectors
US4001774A (en) * 1975-01-08 1977-01-04 Exxon Production Research Company Method of transmitting signals from a drill bit to the surface
US4098342A (en) * 1977-05-25 1978-07-04 Exxon Production Research Company Method and apparatus for maintaining electric cable inside drill pipe
DE2744829A1 (en) * 1977-10-05 1979-04-19 Shell Int Research Drill pipe section with non:obstructive electrical connection - formed by spiralling protective tube on inside walls (OE 15.11.78)
US4220381A (en) * 1978-04-07 1980-09-02 Shell Oil Company Drill pipe telemetering system with electrodes exposed to mud
EP0076801A4 (en) * 1981-01-30 1984-05-29 Tele Drill Inc Insulated drill collar gap sub assembly for a toroidal coupled telemetry system.
EP0076801A1 (en) * 1981-01-30 1983-04-20 Tele-Drill Incorporated Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
EP0090800A1 (en) * 1981-10-01 1983-10-12 Exploration Logging Inc Well logging apparatus and method for making same.
EP0090800A4 (en) * 1981-10-01 1985-09-16 Exploration Logging Inc Well logging apparatus and method for making same.
US4823125A (en) * 1987-06-30 1989-04-18 Develco, Inc. Method and apparatus for stabilizing a communication sensor in a borehole
WO1992004525A1 (en) * 1990-09-07 1992-03-19 Framo Developments (Uk) Limited Pipe system with electrical conductors
US6123561A (en) * 1998-07-14 2000-09-26 Aps Technology, Inc. Electrical coupling for a multisection conduit such as a drill pipe
US20060225926A1 (en) * 2005-03-31 2006-10-12 Schlumberger Technology Corporation Method and conduit for transmitting signals
US7413021B2 (en) 2005-03-31 2008-08-19 Schlumberger Technology Corporation Method and conduit for transmitting signals
US20070063865A1 (en) * 2005-09-16 2007-03-22 Schlumberger Technology Corporation Wellbore telemetry system and method
US20100328096A1 (en) * 2005-09-16 2010-12-30 Intelliserv, LLC. Wellbore telemetry system and method
US20070188344A1 (en) * 2005-09-16 2007-08-16 Schlumberger Technology Center Wellbore telemetry system and method
US9109439B2 (en) 2005-09-16 2015-08-18 Intelliserv, Llc Wellbore telemetry system and method
US8164476B2 (en) 2005-09-16 2012-04-24 Intelliserv, Llc Wellbore telemetry system and method
US20070159351A1 (en) * 2005-12-12 2007-07-12 Schlumberger Technology Corporation Method and conduit for transmitting signals
US7683802B2 (en) 2005-12-12 2010-03-23 Intelliserv, Llc Method and conduit for transmitting signals
US20080106433A1 (en) * 2005-12-12 2008-05-08 Schlumberger Technology Corporation Method and conduit for transmitting signals
US7777644B2 (en) 2005-12-12 2010-08-17 InatelliServ, LLC Method and conduit for transmitting signals
US7859426B2 (en) 2006-07-10 2010-12-28 Intelliserv, Llc Electromagnetic wellbore telemetry system for tubular strings
US7605715B2 (en) 2006-07-10 2009-10-20 Schlumberger Technology Corporation Electromagnetic wellbore telemetry system for tubular strings
US20080041575A1 (en) * 2006-07-10 2008-02-21 Schlumberger Technology Corporation Electromagnetic wellbore telemetry system for tubular strings
US20100099835A1 (en) * 2008-10-22 2010-04-22 Stokes Casey D Production of Vinylidene-Terminated and Sulfide-Terminated Telechelic Polyolefins Via Quenching with Disulfides
US8049506B2 (en) 2009-02-26 2011-11-01 Aquatic Company Wired pipe with wireless joint transceiver
US8851175B2 (en) 2009-10-20 2014-10-07 Schlumberger Technology Corporation Instrumented disconnecting tubular joint
US20150152726A1 (en) * 2012-07-20 2015-06-04 China National Petroleum Corporation Information transmission apparatus for logging while drilling
US9816327B2 (en) * 2012-07-20 2017-11-14 China National Petroleum Corporation Information transmission apparatus for logging while drilling
WO2017054046A1 (en) * 2015-09-29 2017-04-06 Cmte Development Limited System and method for monitoring earth composition while drilling boreholes
AU2016331657B2 (en) * 2015-09-29 2020-05-14 Cmte Development Limited System and method for monitoring earth composition while drilling boreholes

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