(TECHNICAL AND TECHNOLOGICAL SOLUTIONS FOR GAS EXTRACTION FROM GAS HYDRATE DEPOSITS)
Одним из перспективных нетрадиционных источников газа считаются отложения газовых гидратов, запасы метана в которых составляют около 72 % мировых запасов газа. Извлечение метана из таких залежей перспективно, а разработка технологий актуальна. Представленный в статье анализ способов добычи газа из газогидратной залежи с помощью разгерметизации, введения химических реагентов (ингибиторов), нагревания, а также комплексного воздействия, совмещающего перечисленные способы, показал преимущества термического воздействия.
Для разработки собственной технологии термического способа добычи нефтяного газа из осадочных пород с газогидратными включениями авторами был проведен научно-технический и патентный анализ в целях выявления аналогов и прототипа. Установлено, что большинство предлагаемых термических технологий извлечения метана из газогидратных залежей усложнены и дорогостоящи, что обусловлено высокими энергозатратами на нагревание теплоносителя. Кроме того, известно лишь о единичных случаях применения той или иной технологии, значительный практический опыт отсутствует.
Авторы предлагают к рассмотрению новую энергосберегающую технологию добычи газа из газогидратной залежи с применением в качестве теплоносителя термальной воды из нижележащих пластов-доноров. Технология заключается в бурении до подошвы пласта-донора материнской скважины, из которой пробуривают боковой ствол с горизонтальным окончанием (перфорированной трубой), пронизывающий пласт с газогидратными отложениями, протяженностью несколько сотен метров, с созданием условий внутрискважинной циркуляции теплоносителя. Разработанная технология предусматривает контроль и управление основными параметрами процесса извлечения газожидкостной смеси.
One of the promising unconventional sources of gas is considered to be deposits of gas hydrates, methane reserves in which account for 72 % of the world's gas reserves. Production of methane from such deposits is promising, and the development of technologies is relevant. The analysis of methods of gas production from a gas hydrate deposit presented in the article by depressurization, addition of chemical reagents (inhibitors), heating, also as complex exposure, which combines the above-mentioned methods, showed the advantages of the thermal method.
To develop their own technology for the thermal method of production natural gas from sedimentary rocks with gas hydrate inclusions, the authors conducted a scientific, technical and patent analysis to identify analogues and a prototype. It is established that most of the proposed thermal technologies for the production of methane from gas hydrate deposits are complicated and expensive due to the high energy expenses for heating the coolant. In addition, most technologies do not have much experience of practical use, only isolated cases of the use of a particular technology are known.
The authors propose to consider a new energy-saving technology for gas production from a gas hydrate deposit with the use of thermal water from the underlying donor formation as a coolant. The technology consists in drilling to the sole of the donor formation of the mother well from which a lateral wellbore with a horizontal end (perforated pipe) is drilled, penetrating the formation with gas hydrate deposits, lengthing for several hundred meters, with the creation of conditions for downhole circulation of the coolant. The developed technology provides for the control and management of the main parameters of the gas-liquid mixture production process.
M.I. Korabelnikov1, e-mail: korabelnikovmi@mail.ru;
Yu.V. Vaganov2, e-mail: vaganovjv@tyuiu.ru;
N.A. Aksenova1, e-mail: aksenovana@tyuiu.ru;
1 Branch of the Federal State Budgetary Educational Institution of Higher Education “Tyumen Industrial University” in Nizhnevartovsk (Nizhnevartovsk, Russia).
2 Federal State Budgetary Educational Institution of Higher Education “Tyumen Industrial University” (Tyumen, Russia).
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