Method of high temperature hydrocarbon gas convection heating oil shale for exploiting oil gas

Abstract

An oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas relates to a mineral exploitation method. The high-temperature overheating water steam convection heating is used by the prior art to exploit oil and gas of an oil shale. As the temperature capacitance coefficient of the high temperature overheating water steam is low, heating of a mineral layer is slow, which increases the cost and reduces the efficiency. Some oil shale deposits are in the desert, and much water is needed by the overheating water steam heating, so the deposits cannot be exploited. The invention uses the hydrocarbon gas as the convection heating fluid. The high temperature hydrocarbon gas is injected into the oil shale along a heat injection well, and the heated mineral layer causes pyrogenation of the kerogen to form oil and gas, which is carried by the low-temperature gas or water along a production well to the ground. After the oil and gas is separated from the water, gas will be separated independently to from the oil and gas product, and the hydrocarbon gas will enter a storage tank to be pressurized and heated to the designed pressure and temperature. Then the hydrocarbon gas will be injected into the oil shale mineral layer for circulating exploitation of oil and gas. Thus, the oil and gas exploitation method for an oil shale through high-temperature convection-heating of the hydrocarbon gas is economical and more convenient for application in the industry.

Description

technical field [0001] The present invention relates to the extraction method of producing oil and gas from underground oil shale layer (containing kerogen), more specifically, relates to a method of utilizing group wells to fracture, using superheated high-temperature pressure hydrocarbon gas to heat the oil shale layer in a convective manner, A method for exploiting oil and gas by thermally decomposing kerogen. Background technique [0002] China has extremely rich oil shale resources. So far, only a very small amount of oil shale has been exploited through open-pit or underground mining of raw ore, and then the oil and gas are obtained through dry distillation in chemical plants; there is still a large amount of oil shale Yanyuan ore is directly used for power generation and combustion. [0003] In 1992, ING Shell Research Co., Ltd. applied for the invention patent of "oil extraction method for heating oil shale" (CN 1016001B) at the Chinese Patent Office. Because the i...

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Problems solved by technology

However, high-temperature superheated steam still has the following disadvantages as a convective heating fluid: ①The heat capacity coefficient of superheated steam is low, which leads to slow heating of the ore layer, many cycle operations, increased loss and useless work, increased costs, and reduced benefits

②Because some oil shale deposits are located in deserts or Gobi with severe drought and severe water shortage, the water consumption of superheated steam heating is large, which makes this method impossible to implement, or the cost of water is too high, so that the economic benefits of enterprises are very small

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