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{{Short description|Narrow shaft bored in the ground}}
{{Other uses|Tube well}}
[[File:Drilling boreholes for clean water (9084603915).jpg|thumb|A woman in Uganda collects water from a borehole.]]
[[File:Borewell digging.jpg|thumb|Borehole digging for a borewell or [[tube well]]]][[File:Borewell digging.ogv|thumb|Borewell digging]][[File:Drilling boreholes for clean water (9084603915).jpg|thumb|upright|A woman in Uganda collects water from a borehole and attached [[hand pump]]]]
[[File:Borehole 01.jpg|thumb|A drilled well in Ghana]]
[[File:Borehole 01.jpg|thumb|A drilled well in Ghana; the borehole isn't visible]]

A '''borehole''' is a narrow [[Shaft mining|shaft]] [[Boring (earth)|bored]] in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes, including the extraction of [[water]], other liquids (such as [[petroleum]]) or gases (such as [[natural gas]]), as part of a [[geotechnical investigation]], [[Phase I Environmental Site Assessment#Other types of ESA|environmental site assessment]], [[mineral exploration]], [[temperature]] measurement, as a pilot hole for installing piers or underground utilities, for geothermal installations, or for underground storage of unwanted substances, e.g. in [[carbon capture and storage]].
A '''borehole''' is a narrow [[Shaft mining|shaft]] [[Boring (earth)|bored]] in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes, including the extraction of [[water]] ([[Water well#Drilled wells|drilled water well]] and [[tube well]]), other liquids (such as [[petroleum]]), or gases (such as [[natural gas]]). It may also be part of a [[geotechnical investigation]], [[Phase I Environmental Site Assessment#Other types of ESA|environmental site assessment]], [[mineral exploration]], [[temperature]] measurement, as a pilot hole for installing piers or underground utilities, for geothermal installations, or for underground storage of unwanted substances, e.g. in [[carbon capture and storage]].
[[File:Borewell digging.ogv|thumb|Borewell digging]]


==Importance ==
==Importance ==
[[Image:alburyBoreHole.jpg|right|thumb|A water resources borehole into the [[chalk]] [[aquifer]] under the [[North Downs]], England at [[Albury, Surrey|Albury]]]][[engineering|Engineer]]s and [[environmental consulting|environmental consultant]]s use the term ''borehole'' to collectively describe all of the various types of holes drilled as part of a [[geotechnical investigation]] or environmental site assessment (a so-called Phase II ESA). This includes holes advanced to collect soil samples, water samples or rock cores, to advance ''[[in situ]]'' sampling equipment, or to install [[monitoring well]]s or [[piezometer]]s. Samples collected from boreholes are often tested in a laboratory to determine their physical properties, or to assess levels of various chemical constituents or contaminants.
[[Image:alburyBoreHole.jpg|right|thumb|A water resources borehole into the [[chalk]] [[aquifer]] under the [[North Downs]], England at [[Albury, Surrey|Albury]]]][[Engineer]]s and [[environmental consulting|environmental consultant]]s use the term ''borehole'' to collectively describe all of the various types of holes drilled as part of a [[geotechnical investigation]] or environmental site assessment (a so-called Phase II ESA). This includes holes advanced to collect soil samples, water samples or rock cores, to advance ''[[in situ]]'' sampling equipment, or to install [[monitoring well]]s or [[piezometer]]s. Samples collected from boreholes are often tested in a laboratory to determine their physical properties, or to assess levels of various chemical constituents or contaminants.


Typically, a borehole used as a [[water well]] is completed by installing a vertical pipe (casing) and well screen to keep the borehole from caving. This also helps prevent surface [[contaminants]] from entering the borehole and protects any installed pump from drawing in sand and sediment. [[oil well|Oil and natural gas wells]] are completed in a similar, albeit usually more complex, manner.
Typically, a borehole used as a [[water well]] is completed by installing a vertical pipe (casing) and well screen to keep the borehole from caving. This also helps prevent surface [[contaminants]] from entering the borehole and protects any installed pump from drawing in sand and sediment. [[oil well|Oil and natural gas wells]] are completed in a similar, albeit usually more complex, manner.
Line 12: Line 12:
As detailed in [[Proxy (climate)#Boreholes|proxy (climate)]], borehole temperature measurements at a series of different depths can be effectively "[[Invertible matrix|inverted]]" (a mathematical formula to solve a matrix equation) to help estimate historic surface temperatures.
As detailed in [[Proxy (climate)#Boreholes|proxy (climate)]], borehole temperature measurements at a series of different depths can be effectively "[[Invertible matrix|inverted]]" (a mathematical formula to solve a matrix equation) to help estimate historic surface temperatures.


Clusters of small-diameter boreholes equipped with heat exchangers made of plastic PEX pipe can be used to store heat or cold between opposing seasons in a mass of native rock. The technique is called [[seasonal thermal energy storage]]. Media that can be used for this technique ranges from gravel to bedrock. There can be a few to several hundred boreholes, and in practice, depths have ranged from 150 to 1000 feet.<ref>Hellström G. (2008). [http://arquivo.pt/wayback/20160522223452/http://www.annex29.net/extern/10_HELLSTROM_Zurich%20080519.pdf Large-Scale Applications of Ground-Source Heat Pumps in Sweden.] IEA HP Annex 29 Workshop, Zurich, May 19, 2008.</ref><ref>Stiles L. (1998). [http://www.izw-online.de/berichte/HPC_News.php?file=55?sort=1 Underground Thermal Energy Storage in the US]{{dead link|date=November 2016 |bot=InternetArchiveBot |fix-attempted=yes }}. IEA Heat Pump Centre Newsletter. 16:2:pp.22-23.</ref>
Clusters of small-diameter boreholes equipped with heat exchangers made of plastic PEX pipe can be used to store heat or cold between opposing seasons in a mass of native rock. The technique is called [[seasonal thermal energy storage]]. Media that can be used for this technique ranges from gravel to bedrock. There can be a few to several hundred boreholes, and in practice, depths have ranged from {{convert|150|to|1000|ft|m|order=flip|sigfig=1}}.<ref>Hellström G. (2008). [http://arquivo.pt/wayback/20160522223452/http://www.annex29.net/extern/10_HELLSTROM_Zurich%20080519.pdf Large-Scale Applications of Ground-Source Heat Pumps in Sweden.] IEA HP Annex 29 Workshop, Zurich, May 19, 2008.</ref><ref>{{Cite journal |last=Stiles |first=Lynn |date=June 1998 |title=Underground thermal energy storage in the US |url=https://heatpumpingtechnologies.org/publications/51667/ |journal=IEA Heat Pump Centre Newsletter |volume=16 |issue=2 |pages=22–23 |via=}}</ref>


==History==
==History==
Borehole drilling has a long history. By at least the Han Dynasty (202 BC&nbsp;– 220 AD), the Chinese used deep borehole drilling for mining and other projects. The British sinologist and historian [[Michael Loewe]] states that borehole sites could reach as deep as 600&nbsp;m (2000&nbsp;ft).<ref name="loewe 1968 194">Loewe (1968), 194.</ref> K.S. Tom describes the drilling process: "The Chinese method of deep drilling was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the boring tool was rotated by buffalo and oxen."<ref name="tom 1989 103">Tom (1989), 103.</ref> This was the same method used for extracting [[petroleum]] in [[California]] during the 1860s (i.e. "Kicking Her Down").<ref name="tom 1989 103"/><ref name="Hobson 2004 215">{{Cite book |title=The Eastern Origins of Western Civilisation |last= Hobson |first=John M. |publisher= Cambridge University Press |year=2004 |isbn= 978-0521547246 |pages=215}}</ref> A Western Han Dynasty bronze foundry discovered in Xinglong, [[Hebei]] had nearby [[shaft mining|mining shafts]] which reached depths of 100&nbsp;m (328&nbsp;ft) with spacious mining areas; the shafts and rooms were complete with a timber frame, ladders and iron tools.<ref name="loewe 1968 191">Loewe (1968), 191.</ref><ref name="wang 1982 105">Wang (1982), 105.</ref> By the first century BC, Chinese craftsmen cast iron drill bits and drillers were able to drill boreholes up to 4800 feet (1500 m) deep.<ref>{{Cite book |title=Fundamentals of Sustainable Drilling Engineering |last= Hossain |first= M. E. |last2=Abdullah Al-Majed |first2=Abdulaziz |publisher=Wiley-Scrivener |year=2015 |isbn=978-0470878170 |publication-date=March 2, 2015}}</ref><ref>{{Cite book |title=Chronology of Science |url=https://archive.org/details/factsonfilechron00reze |url-access=limited |last= Rezende |first= Lisa |publisher=Checkmark Books |year=2007 |isbn=978-0816071197 |publication-date=April 1, 2007 |pages=[https://archive.org/details/factsonfilechron00reze/page/n50 40]}}</ref><ref name="Conner 2005 175">{{Cite book |last=Conner |first=Clifford D. |title=A People's History of Science: Miners, Midwives, and Low Mechanicks |publisher=Nation Books |year=2005 |isbn=978-1560257486 |pages=[https://archive.org/details/peopleshistoryof0000conn/page/175 175] |url=https://archive.org/details/peopleshistoryof0000conn/page/175 }}</ref> By the eleventh century AD, the Chinese were able to drill boreholes up to 3000 feet in depth. Drilling for boreholes was time-consuming and long. As the depth of the holes varied, the drilling of a single well could last nearly one full decade.<ref name="tom 1989 103">Tom (1989), 103.</ref> It wasn't up until the 19th century that Europe and the West would catch up and rival ancient Chinese borehole drilling technology.<ref name="Conner 2005 175"/><ref name="Hobson 2004 215"/>
Borehole drilling has a long history. By at least the Han dynasty (202&nbsp;BC&nbsp;– 220&nbsp;AD), the Chinese used deep borehole drilling for mining and other projects. The British sinologist and historian [[Michael Loewe]] states that borehole sites could reach as deep as {{convert|600|m|ft}}.<ref name="loewe 1968 194">Loewe (1968), 194.</ref> K.S. Tom describes the drilling process: "The Chinese method of deep drilling was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the boring tool was rotated by buffalo and oxen."<ref name="tom 1989 103">Tom (1989), 103.</ref> This was the same method used for extracting [[petroleum]] in [[California]] during the 1860s (i.e. "kicking her down").<ref name="tom 1989 103"/><ref name="Hobson 2004 215">{{Cite book |title=The Eastern Origins of Western Civilisation |last= Hobson |first=John M. |publisher= Cambridge University Press |year=2004 |isbn= 978-0521547246 |pages=215}}</ref> A Western Han dynasty bronze foundry discovered in Xinglong, [[Hebei]] had nearby [[shaft mining|mining shafts]] which reached depths of {{convert|100|m|ft}} with spacious mining areas; the shafts and rooms were complete with a timber frame, ladders and iron tools.<ref name="loewe 1968 191">Loewe (1968), 191.</ref><ref name="wang 1982 105">Wang (1982), 105.</ref> By the first century BC, Chinese craftsmen cast iron drill bits and drillers were able to drill boreholes up to {{convert|1500|m|ft}} deep.<ref>{{Cite book |title=Fundamentals of Sustainable Drilling Engineering |last1= Hossain |first1= M. E. |last2=Abdullah Al-Majed |first2=Abdulaziz |publisher=Wiley-Scrivener |year=2015 |isbn=978-0470878170 |publication-date=March 2, 2015}}</ref><ref>{{Cite book |title=Chronology of Science |url=https://archive.org/details/factsonfilechron00reze |url-access=limited |last= Rezende |first= Lisa |publisher=Checkmark Books |year=2007 |isbn=978-0816071197 |publication-date=April 1, 2007 |pages=[https://archive.org/details/factsonfilechron00reze/page/n50 40]}}</ref><ref name="Conner 2005 175">{{Cite book |last=Conner |first=Clifford D. |title=A People's History of Science: Miners, Midwives, and Low Mechanicks |publisher=Nation Books |year=2005 |isbn=978-1560257486 |pages=[https://archive.org/details/peopleshistoryof0000conn/page/175 175] |url=https://archive.org/details/peopleshistoryof0000conn/page/175 }}</ref> By the eleventh century AD, the Chinese were able to drill boreholes up to {{convert|3000|ft|m|order=flip|sigfig=1}} in depth. Drilling for boreholes was time-consuming and long. As the depth of the holes varied, the drilling of a single well could last nearly one full decade.<ref name="tom 1989 103">Tom (1989), 103.</ref> It wasn't up until the 19th century that Europe and the West would catch up and rival ancient Chinese borehole drilling technology.<ref name="Conner 2005 175"/><ref name="Hobson 2004 215"/>


For many years, the world's longest borehole was the [[Kola Superdeep Borehole]] in Russia. From 2011 until August 2012 the record was held by the {{convert|12345|m|ft|adj=on}} long [[Sakhalin-I]] Odoptu OP-11 Well, offshore the Russian island [[Sakhalin]].<ref>[http://www.ordons.com/asia/far-east/9976-sakhalin-1-project-drills-worlds-longest-extended-reach-well.html Sakhalin-1 Project Drills World's Longest Extended-Reach Well] {{webarchive|url=https://web.archive.org/web/20110131190440/http://www.ordons.com/asia/far-east/9976-sakhalin-1-project-drills-worlds-longest-extended-reach-well.html |date=2011-01-31 }}</ref> The [[Sakhalin-I#Fields: Chayvo.2C Odoptu and Arkutun-Dagi|Chayvo]] Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012. Z-44's total measured depth is 12,376&nbsp;m (40,604&nbsp;ft). However, ERD wells are more shallow than Kola Superdeep Borehole, owing to a large horizontal displacement.
For many years, the world's longest borehole was the [[Kola Superdeep Borehole]] in Russia. From 2011 until August 2012 the record was held by the {{convert|12345|m|ft|adj=on}} long [[Sakhalin-I]] Odoptu OP-11 Well, offshore the Russian island [[Sakhalin]].<ref>[http://www.ordons.com/asia/far-east/9976-sakhalin-1-project-drills-worlds-longest-extended-reach-well.html Sakhalin-1 Project Drills World's Longest Extended-Reach Well] {{webarchive|url=https://web.archive.org/web/20110131190440/http://www.ordons.com/asia/far-east/9976-sakhalin-1-project-drills-worlds-longest-extended-reach-well.html |date=2011-01-31 }}</ref> The [[Sakhalin-I#Fields: Chayvo.2C Odoptu and Arkutun-Dagi|Chayvo]] Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012. Z-44's total measured depth is {{convert|12376|m|ft}}. However, ERD wells are more shallow than the Kola Borehole, owing to a large horizontal displacement. In July 2023, China began drilling deep boreholes, one at the [[Sichuan Basin]] expected to reach {{convert|10520|m|ft}} into the ground and the other at the [[Tarim Basin]] with a planned depth of {{convert|11100|m|ft}}.<ref>{{Cite web |last=Lau |first=Chris |date=2023-07-21 |title=China is drilling some of the world's deepest holes in hunt for natural resources |url=https://www.cnn.com/2023/07/21/china/china-second-superdeep-borehole-intl-hnk/index.html |access-date=2023-07-23 |website=CNN |language=en}}</ref><ref>{{Cite web |date=2023-07-23 |title=China is drilling some of the deepest holes in hunt for natural resources |url=https://www.9news.com.au/world/china-is-drilling-some-of-the-worlds-deepest-holes-in-hunt-for-natural-resources/3a6cbb8f-9c15-4178-8c98-1c07cd931f48 |access-date=2023-07-23 |website=www.9news.com.au}}</ref>


== Methodology ==
== Methodology ==
{{further|Well drilling}}
[[File:Borewell digging.jpg|thumb|Borewell digging]]
Drillers may sink a borehole using a [[drilling rig]] or a hand-operated rig. The machinery and techniques to advance a borehole vary considerably according to manufacturer, geological conditions, and the intended purpose. For [[offshore drilling]] floating units or platforms supported by the seafloor are used for the drilling rig.
Drillers may sink a borehole using a [[drilling rig]] or a hand-operated rig. The machinery and techniques to advance a borehole vary considerably according to manufacturer, geological conditions, and the intended purpose. For [[offshore drilling]] floating units or platforms supported by the seafloor are used for the drilling rig.

== Hand Digging ==
[[File:Borehole-Manual-Digging-Process-2050-Paris.jpg|thumb|Two Borehole Diggers Manually Digging a Borehole]]
Especially in developing countries many boreholes are stull dug by hand. The digging begins with manual labor using basic tools such as shovels, picks, and crowbars. Workers excavate the soil layer by layer, often using a circular motion to create a well-shaped hole. The process is slow and demanding, requiring teamwork and coordination. To prevent the walls from collapsing and to ensure water quality, the borehole is lined with materials like bricks, stones, or concrete rings. This reinforcement maintains the integrity of the borehole's structure and helps to prevent contamination. A concrete platform or slab may be installed at the bottom to prevent sediment from entering the water. The top of the borehole is capped to protect it from debris and contamination.<ref>{{Cite web |date=2023-08-01 |title=Transformative Borehole Drilling Projects: Empowering Carbon Credit Initiatives - 2050 Paris {{!}} |url=https://2050.paris/borehole-drilling-projects/ |access-date=2024-01-03 |language=en-US}}</ref>


==See also==
==See also==
Line 33: Line 37:


==References==
==References==
{{Reflist}}
<references/>


==External links==
==External links==
⚫
{{Wiktionary|borehole}}
⚫
* [https://www.geologieportal.ch/en/themes/fundamentals-of-geology/boreholes.html Boreholes: Swiss Geological Survey]{{Dead link|date=July 2020 |bot=InternetArchiveBot |fix-attempted=yes }}

{{commons category|Boreholes}}
{{commons category|Boreholes}}
⚫
* [https://web.archive.org/web/20200920064331/https://www.geologieportal.ch/en/themes/fundamentals-of-geology/boreholes.html Boreholes: Swiss Geological Survey]
⚫
{{Wiktionary|borehole}}


{{Geotechnical engineering|state=collapsed}}
{{Geotechnical engineering|state=collapsed}}
{{Man-made and man-related Subterranea}}
{{Man-made and man-related Subterranea}}
{{Authority control}}


[[Category:Chinese inventions]]
[[Category:Chinese inventions]]

Revision as of 14:24, 27 June 2024

Borehole digging for a borewell or tube well
Borewell digging
A woman in Uganda collects water from a borehole and attached hand pump
A drilled well in Ghana; the borehole isn't visible

A borehole is a narrow shaft bored in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes, including the extraction of water (drilled water well and tube well), other liquids (such as petroleum), or gases (such as natural gas). It may also be part of a geotechnical investigation, environmental site assessment, mineral exploration, temperature measurement, as a pilot hole for installing piers or underground utilities, for geothermal installations, or for underground storage of unwanted substances, e.g. in carbon capture and storage.

Importance

A water resources borehole into the chalk aquifer under the North Downs, England at Albury

Engineers and environmental consultants use the term borehole to collectively describe all of the various types of holes drilled as part of a geotechnical investigation or environmental site assessment (a so-called Phase II ESA). This includes holes advanced to collect soil samples, water samples or rock cores, to advance in situ sampling equipment, or to install monitoring wells or piezometers. Samples collected from boreholes are often tested in a laboratory to determine their physical properties, or to assess levels of various chemical constituents or contaminants.

Typically, a borehole used as a water well is completed by installing a vertical pipe (casing) and well screen to keep the borehole from caving. This also helps prevent surface contaminants from entering the borehole and protects any installed pump from drawing in sand and sediment. Oil and natural gas wells are completed in a similar, albeit usually more complex, manner.

As detailed in proxy (climate), borehole temperature measurements at a series of different depths can be effectively "inverted" (a mathematical formula to solve a matrix equation) to help estimate historic surface temperatures.

Clusters of small-diameter boreholes equipped with heat exchangers made of plastic PEX pipe can be used to store heat or cold between opposing seasons in a mass of native rock. The technique is called seasonal thermal energy storage. Media that can be used for this technique ranges from gravel to bedrock. There can be a few to several hundred boreholes, and in practice, depths have ranged from 50 to 300 metres (150 to 1,000 ft).[1][2]

History

Borehole drilling has a long history. By at least the Han dynasty (202 BC – 220 AD), the Chinese used deep borehole drilling for mining and other projects. The British sinologist and historian Michael Loewe states that borehole sites could reach as deep as 600 metres (2,000 ft).[3] K.S. Tom describes the drilling process: "The Chinese method of deep drilling was accomplished by a team of men jumping on and off a beam to impact the drilling bit while the boring tool was rotated by buffalo and oxen."[4] This was the same method used for extracting petroleum in California during the 1860s (i.e. "kicking her down").[4][5] A Western Han dynasty bronze foundry discovered in Xinglong, Hebei had nearby mining shafts which reached depths of 100 metres (330 ft) with spacious mining areas; the shafts and rooms were complete with a timber frame, ladders and iron tools.[6][7] By the first century BC, Chinese craftsmen cast iron drill bits and drillers were able to drill boreholes up to 1,500 metres (4,900 ft) deep.[8][9][10] By the eleventh century AD, the Chinese were able to drill boreholes up to 900 metres (3,000 ft) in depth. Drilling for boreholes was time-consuming and long. As the depth of the holes varied, the drilling of a single well could last nearly one full decade.[4] It wasn't up until the 19th century that Europe and the West would catch up and rival ancient Chinese borehole drilling technology.[10][5]

For many years, the world's longest borehole was the Kola Superdeep Borehole in Russia. From 2011 until August 2012 the record was held by the 12,345-metre (40,502 ft) long Sakhalin-I Odoptu OP-11 Well, offshore the Russian island Sakhalin.[11] The Chayvo Z-44 extended-reach well took the title of the world's longest borehole on 27 August 2012. Z-44's total measured depth is 12,376 metres (40,604 ft). However, ERD wells are more shallow than the Kola Borehole, owing to a large horizontal displacement. In July 2023, China began drilling deep boreholes, one at the Sichuan Basin expected to reach 10,520 metres (34,510 ft) into the ground and the other at the Tarim Basin with a planned depth of 11,100 metres (36,400 ft).[12][13]

Methodology

Further information: Well drilling

Drillers may sink a borehole using a drilling rig or a hand-operated rig. The machinery and techniques to advance a borehole vary considerably according to manufacturer, geological conditions, and the intended purpose. For offshore drilling floating units or platforms supported by the seafloor are used for the drilling rig.

Hand Digging

Two Borehole Diggers Manually Digging a Borehole

Especially in developing countries many boreholes are stull dug by hand. The digging begins with manual labor using basic tools such as shovels, picks, and crowbars. Workers excavate the soil layer by layer, often using a circular motion to create a well-shaped hole. The process is slow and demanding, requiring teamwork and coordination. To prevent the walls from collapsing and to ensure water quality, the borehole is lined with materials like bricks, stones, or concrete rings. This reinforcement maintains the integrity of the borehole's structure and helps to prevent contamination. A concrete platform or slab may be installed at the bottom to prevent sediment from entering the water. The top of the borehole is capped to protect it from debris and contamination.[14]

See also

References

  1. ^ Hellström G. (2008). Large-Scale Applications of Ground-Source Heat Pumps in Sweden. IEA HP Annex 29 Workshop, Zurich, May 19, 2008.
  2. ^ Stiles, Lynn (June 1998). "Underground thermal energy storage in the US". IEA Heat Pump Centre Newsletter. 16 (2): 22–23.
  3. ^ Loewe (1968), 194.
  4. ^ a b c Tom (1989), 103.
  5. ^ a b Hobson, John M. (2004). The Eastern Origins of Western Civilisation. Cambridge University Press. p. 215. ISBN 978-0521547246.
  6. ^ Loewe (1968), 191.
  7. ^ Wang (1982), 105.
  8. ^ Hossain, M. E.; Abdullah Al-Majed, Abdulaziz (2015). Fundamentals of Sustainable Drilling Engineering. Wiley-Scrivener (published March 2, 2015). ISBN 978-0470878170.
  9. ^ Rezende, Lisa (2007). Chronology of Science. Checkmark Books (published April 1, 2007). pp. 40. ISBN 978-0816071197.
  10. ^ a b Conner, Clifford D. (2005). A People's History of Science: Miners, Midwives, and Low Mechanicks. Nation Books. pp. 175. ISBN 978-1560257486.
  11. ^ Sakhalin-1 Project Drills World's Longest Extended-Reach Well Archived 2011-01-31 at the Wayback Machine
  12. ^ Lau, Chris (2023-07-21). "China is drilling some of the world's deepest holes in hunt for natural resources". CNN. Retrieved 2023-07-23.
  13. ^ "China is drilling some of the deepest holes in hunt for natural resources". www.9news.com.au. 2023-07-23. Retrieved 2023-07-23.
  14. ^ "Transformative Borehole Drilling Projects: Empowering Carbon Credit Initiatives - 2050 Paris |". 2023-08-01. Retrieved 2024-01-03.
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