METHOD OF GAS HYDRATES DEVELOPMENT

Student: master’s student,Arkhat Sultabayev

Moscow-2014

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CONTENTo Existing methods of gas production from gas hydrates

o Decompression method of gas production

o Examples of usage

o Conclusions

o References

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OUTLOOK

“Gas hydrates—ice-like compounds containing methane—may become a significant energy resource if ways can be found to exploit them.

Although many countries and organizations are finding gas hydrates plentiful and widespread, the problem remains as to how to produce methane from them safely, efficiently and economically.”

Schlumberger, 2010

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POSSIBLE METHODS TO PRODUCE GAS FROM GAS HYDRATES• Reduce the pressure in the reservoir below the hydrate-

equilibrium pressure

• Increase temperature above the hydrate-equilibrium temperature

• Inject chemicals into the hydrated layer that will cause dissociation

• Hydrates mining

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POSSIBLE METHODS TO PRODUCE GAS FROM GAS HYDRATES

Source: US Patent System; PATENTS US 2005016121, US 9326174, US 06192691

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DEPRESSURIZATION OF GAS HYDRATES

Source: PATENT WO IB20060036

“A method and system for the

production of a gas hydrate including

the steps of drilling into a subterranean

gas hydrate formation and at least

partially depressurizing the gas hydrate

formation to permit separation of gas

and water from the hydrate form. The

gas and water is then pumped from the

formation and recovered from the well.

At least a portion of water pumped from

the well is water that is introduced into

the well from the surface or

reintroduced by a feed back loop from

the production operation.”

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MALIK FIELD (2008)

Source: Schlumberger, 2010

Japan Oil, Gas and Metals National Corporation (JOGMEC), and Natural Resources Canada

2000-4000 cm during 6 days

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1ST OFFSHORE HYDRATE PROJECT (TEST)

JOGMEC (12-18 March 2013), Japan

Water depth – 1000 m

Deposits depth (below the sea bed) – 260 m

Capacity of hydrated layers – 60 m

Hydrates Saturation – up to 80% (???)

3 wells were drilled (February 2012)

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EXPERIMENTAL PRODUCTION

Production time: 6 days

Average production rate: 20 000 cm/day

Cause of production closedown: High Sand Cut

Time of industrial production: 2018-2019 (???)

Operating Vessel: Deep Sea Drilling Vessel “Chikyu”

Source: http://www.jogmec.go.jp/english/news/release/release0110.html

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OFFICIAL RESULTS“As the result, it was proven that the depressurization method is able to dissociate methane hydrate more efficiently.

Therefore, it is planned to apply the depressurization method to this offshore production test as well.”

NEWS RELEASE Japan Oil, Gas and Metals National Corporation (www.jogmec.go.jp)

“The Mallik tests successfully demonstrated a field-scale proof-of-concept for gas production from hydrates by depressurization using conventional oilfield technologies adapted for arctic conditions.”

Developments in Gas Hydrates, Shlumberger

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CONCLUSION• There are several possible methods of gas production

from gas hydrates

• All of them are energy-intensive methods

• “it was proven that the depressurization method is able to dissociate methane hydrate more efficiently.”

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REFERENCES

http://www.jogmec.go.jp/

http://www.slb.com/~/media/Files/resources/oilfield_review/ors10/spr10/02_gashydrates.pdf

http://www.google.com/patents/US20080088171

http://www.google.com/patents/US4424866

http://www.google.com/patents/US6192691

http://www.google.com/patents/US20050161217

http://www.findpatent.ru/patent/240/2403379.html

http://www.findpatent.ru/patent/241/2412337.html

http://en.wikipedia.org/wiki/Nankai_Trough_gas_hydrate_site