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Publication numberUS3424254 A
Publication typeGrant
Publication dateJan 28, 1969
Filing dateDec 29, 1965
Priority dateDec 29, 1965
Publication numberUS 3424254 A, US 3424254A, US-A-3424254, US3424254 A, US3424254A
InventorsHuff Major Walter
Original AssigneeHuff Major Walter
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cryogenic method and apparatus for drilling hot geothermal zones
US 3424254 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 28, 1969 w. H u FF 3,424,254 CRYOGENIC METH AND APPARATUS FOR DRILLING HOT GEOTHERMAL ZONES Filed Dec. 29, 1965 MAJOR W. HUFF INVENTOR.

fvww, w 5M- ATTORNEYS United States Patent 3 424,254 CRYOGENIC METHCD AND APPARATUS FOR DRILLING HOT GEOTHERMAL ZONES Major Walter Huff, 3361 Craigend, West Vancouver, British Columbia, Canada Filed Dec. 29, 1965, Ser. No. 517,295 US. Cl. 175-17 Int. Cl. E21b 7/00, 41/00 2 Claims ABSTRACT OF THE DISCLOSURE This invention relates to a new and novel process for boring holes into hot geothermal zones such as volcanoes and the like. More particularly does this invention relate to a new and novel process by which cold cryogenic fluids are evaporated to provide cooling gases for drill pipe and the cutting edges of boring tools and to remove cuttings from the bottom of the hole and carry them to the earths surface.

In present day rrotary drilling, it is common to circulate water or air through the drill pipe and boring tool as a coolant and to bring the cuttings from the bottom of the hole to the surface after they have been broken up by the boring tool. These known methods are, however, not well suited to drilling materials that are at temperatures above the boiling point of water. They become very inefllcient when the temperature of the material being drilled approaches that of molten glass as would be found in volcanoes and other high temperature rock masses. Much thought has been given by science to the tapping of natural high temperature sources for the provision of heat as a basic power source for electricity and other uses. Water based drilling fluids are objectionable at such high temperatures since they turn to steam and pressures become excessive. Other fluids are either too costly or have properties that support combustion with the attendant possibility of fire. Air as a working medium requires compression and cooling before it can be used to cool the drilling tools, and it must be thoroughly dry to eliminate the possibility of steam pockets being formed from entrained water vapor. Moreover, air provides an oxidizing medium that is injurious to the cutting edges of the boring tool bits at elevated temperatures. Efforts have been made to apply refrigeration and drying methods to these drilling fluids and gases, and inert gases have been substituted for air. However, these applications have always been accompanied by the objectionable requirements of compression, cooling and drying equipment which are both cumbersome and costly.

This invention overcomes the disadvantages, diificulties and other impractical considerations inherent in conventional methods and apparatus. Inert cryogens have extremely low temperatures in the liquid state and it is known that these super-cold liquids can be pumped or poured like any other fluid. Furthermore, they can be stored for considerable periods of time in insulated vessels under slight pressure. According to the present invention storage is provided as are means to raise the inert cryogenic fluid to slightly above its critical temperature to "ice volatilize it to gas. The gas is then directed to a receiver tank where it is metered into the drill hole through the boring tool and over the cutting edges of the bit. In addition to providing cooling in the high temperature earth or rock mass so that a solid hole can be formed the gas provides an inert atmosphere around the cutting edges of the drilling tool bit. It then expands into a zone of lesser pressure outside the drilling stem and is carried back to the surface along with the drilling tool cuttings. This unique method of tapping the hitherto unutilized source of heat that resides in volcanoes and other high temperature earth and rock masses provides a new, novel and operable system for obtaining power from nautral sources.

Accordingly it is a prime feature of this invention to provide cryogenic drilling method and apparatus that will keep the drill pipe and boring tool cool and also maintain the surrounding rock fromations at a low enough temperature to remain in a solid state. Another feature of this invention is to provide cryogenic drilling method and apparatus whereby the drilling tools are kept cool and in which the drilling tool bits are maintained in an inert atmosphere to prevent oxidation of the cutting edges. Still another feature of this invention is to provide cryogenic drilling method and apparatus which is of compact design, eflicient, automatic, and which requires no separate auxiliary equipment such as pumps and compressors. Yet another feature of this invention is to provide cryogenic drilling apparatus and method which is economical to in stall and operate and which offers ease of maintenance.

These and other objects, advantages and features will become apparent in the following description of the invention. Reference will be had to the appended drawing which shows schematically the equipment required and the steps involved in the utilization of cryogenic fluid.

Referring now to the drawing it will be seen that an insulated storage tank 10 is provided to receive and store the liquid cryogenic material. The cryogenics which may be considered for use in this method and apparatus include nitrogen, argon, neon, helium, krypton, xenon, and mixtures thereof. It is well known to those skilled in the art that cryogenic materials in the liquid state are supercold but that they can be pumped or poured like any other fluid. The temperature in tank 10 is maintained at around minus 292 F. for nitrogen, for example, so that the resultant vapor pressure of gaseous nitrogen over liquid nitrogen will be approximately 60 psi. Storage tank 10 has a safety release valve 12. Liquid cryogen is taken out of tank 10 through a line 14 which has a shut-off valve 16. A pump 18 specifically adapted to the pumping of cryogenics provides the means by which the liquid is removed from tank 10. From the pump 18 the fluid passes into line 20 having a check valve 22 therein and thence into an evaporator means 24. Pump 18 preferably is of the controlled variable volume type. It will be understood in using liquid nitrogen as an example that the temperatures and pressures herein stated are merely by way of example and are considered non-limiting. It is important that the cryogen be stored as a liquid. In an evaporator device 24, preferably utilizing electric heat, the temperature of the liquid nitrogen is raised to its critical temperature or just above minus 232 F. at which the vapor pressure of the nitrogen gas will be in the order of 492 psi. From evaporator 24 the gas passes through line 26 through a back pressure regulating valve 28 and thence into an insulated receiver vessel 30 equipped with cryogenic temperature and pressure sensors 32 and 34, respectively, which in turn control the operation of the liquid nitrogen feed apparatus and the evaporator temperature. The compensating type back pressure regulating valve 28 is electrically operated as by means 36 while the evaporator heat control is established with controls 38, and the variable volume cryogenic pump is regulated with volume control 39. The sensors 32 and 34, of course, are connected through pressure and temperature control relay 40 to the various elements on the upstream side of the receiver vessel 30.

The gas passes from the receiver through an outlet line 42 having a spring loaded check valve 44 and a gas flow control valve 46. From line 42 the gas passes into and through a series of insulated pipes 48, 50, 52 and 54, connected by flexible ball joints 56, and into a drill pipe swivel joint 58. The cold gas then passes down the inside of drill pipe 60 where it becomes further pressurized as it picks up heat from the formations being drilled. It will be seen that the drilling components are conventional such as means 62 for rotating the drill, drill seal 64 and the boring tool 66 with drill bits 68. Surface casing pipe 70 is cemented or attached to surface rock 72 in the formation while the lower end of the drilling stem, of course, will extend into the hot geothermal zone 74. As the gas passes through ,drill pipe 60 and boring tool 66, past and around bits 68, it returns to the surface outside the drilling pipe carrying with it the cuttings from the bottom of the drill hole. The gas and cuttings are taken out of the hole by a discharge line 76. In the boring tool 66 and bits 68 the compressed gas issues from appropriate orifices and expands into a region of lesser pressure outside drill pipe 60 generally designated by the number 78. As the gas issues from the boring tool it expands and cools the cutting edges of the bits. This high velocity gas also keeps the bits clean and free of damaging effects of oxidation at the temperatures at which the boring tool works.

The foregoing is considered as illustrative only of the principles of this invention. Numerous modifications and changes will occur to those skilled in the art, and hence it is not desired to limit the invention to exact construction, operation and method shown and described. Accordingly, all suitable modifications and equivalents may be resorted to which fall within the scope of this invention.

What is claimed is:

1. A method of drilling through hot geothermal zones such as molten lava and the like with a hollow rotary drill stem having a ported bit at its inner end, comprismg:

cooling, cleaning and providing an inert atmosphere in and around the drill stem, and solidifying the portions of the geothermal zone contiguous the drill stem, by flowing a super cold, inert, cryogenic gas, first through and then back along the outer surfaces of the drill stem;

rotating said drill stem While moving it endwise into the thus solidified geothermal zone; and

removing the used gases and the cuttings from the drill hole.

2. The method of claim 1, comprising storing the cryogenic gas in the liquid state within an insulated tank; removing such liquid from said tank at a controlled rate; and heating said liquid to change its state to that of a supercold gas.

References Cited UNITED STATES PATENTS 616,496 12/1898 Russell 17517 2,621,022 12/1952 Bardill 17517 2,861,780 11/1958 Butler 17517 2,905,444 9/1959 Shepard 17517 2,915,285 12/1959 Deily 175-17 3,100,528 8/1963 Plummer 166-42 3,301,326 1/1967 McNamer 166-39 X OTHER REFERENCES Drilling, publication, April 1962, pp. 51, and 56.

NILE C. BYERS, JR., Primary Examiner.

US. Cl. X.R. 166-39

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US616496 *Jan 5, 1898Dec 27, 1898 Boring-tool
US2621022 *Feb 9, 1945Dec 9, 1952Bardill John DMethod of drilling overburden, unconsolidated rock formation or placer ground with low-temperature freezing fluids
US2861780 *Jun 20, 1956Nov 25, 1958Jimmy L ButlerMeans for cooling the cutters of drill bits
US2905444 *Jul 26, 1957Sep 22, 1959Evalyn ShepardCore barrel
US2915285 *May 23, 1956Dec 1, 1959Jersey Prod Res CoCoring subterranean formations
US3100528 *Feb 6, 1961Aug 13, 1963Big Three Welding Equipment CoMethods for using inert gas
US3301326 *Dec 31, 1963Jan 31, 1967Eline Acid CoMethod for selectively increasing the porosity and permeability of subterranean geologic formations
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3612192 *Apr 14, 1969Oct 12, 1971Maguire James C JrCryogenic drilling method
US3650337 *Jul 31, 1969Mar 21, 1972Aerojet General CoCryogenically cooled drill
US3738424 *Jun 14, 1971Jun 12, 1973Big Three IndustriesMethod for controlling offshore petroleum wells during blowout conditions
US3883177 *Jan 23, 1974May 13, 1975Baciu Petru CDiamond drill and rock fragment excavation device
US4191266 *Feb 28, 1978Mar 4, 1980Wouter H. van EekProcess and installation for drilling holes in the earth's crust under freezing conditions
US4593763 *Aug 20, 1984Jun 10, 1986Grayco Specialist Tank, Inc.Carbon dioxide well injection method
US7000711Feb 9, 2004Feb 21, 2006Ch2M Hill, Inc.Horizontal bore cryogenic drilling method
US7500528 *Apr 21, 2006Mar 10, 2009Shell Oil CompanyLow temperature barrier wellbores formed using water flushing
US7681672 *Mar 23, 2006Mar 23, 2010The University Of ScrantonCryogenic pulsejet and method of use
WO2005077051A2 *Feb 9, 2005Aug 25, 2005Ch2M Hill IncHorizontal bore cryogenic drilling method
WO2006105014A2 *Mar 23, 2006Oct 5, 2006Robert A SpallettaCryogenic pulsejet
Classifications
U.S. Classification175/17, 166/302
International ClassificationF17C9/00, E21B41/02, E21B41/00, E21B36/00, F17C9/02
Cooperative ClassificationE21B36/003, E21B41/02, F17C9/02
European ClassificationF17C9/02, E21B41/02, E21B36/00C