Method for exploiting oil sand through paraffin media

Abstract

The invention provides a method for exploiting oil sand through paraffin media. In at least one period, the method includes the following steps: a central tube is arranged on an oil deposit section in an oil well shaft, a sleeve is arranged outside the central tube, and annular space between the central tube and the sleeve is used for containing liquid water; a steam hole is formed in the upper end of the central tube, the position of the steam hole is higher than a working liquid level of the liquid water in the annular space between the central tube and the sleeve, and a steam outlet hole is formed in the lower end; the paraffin media are injected into annular space between the shaft and the sleeve to maintain the reservoir pressure, and are heated through a heating system; the liquid water is continuously injected into the annular space between the central tube and the sleeve; heat exchanging is carried out between the paraffin media and the liquid water to generate steam, and the steam enters the central tube through the steam hole of the central tube and flows out from the steam outlet hole to be in contact with an oil deposit for heat exchanging; when the steam injection amount meets the oil field steam flooding period heat supply requirement, heating is stopped, water is supplied, and oil extraction is carried out after a well is shut. The method is stable in steam generation, free of pollution, convenient to maintain and low in investment.

Description

technical field [0001] The invention relates to a method for exploiting oil sands by using paraffin medium, belonging to the field of oil sand exploitation. Background technique [0002] Oil sand, also known as tar sand or tar sand, is sand or sandstone containing bitumen or tar, which is one of the unconventional petroleum resources. Crude oil in oil sands is highly viscous and must be heated or diluted in order to flow. [0003] According to the different conditions of oil sand mines, the mining methods commonly adopted in the world include outcrop mining, in-situ mining and other mining methods, of which the first two are the main mining methods. In-situ mining methods include sand production cold recovery technology, steam huff and puff and steam flooding technology, steam assisted gravity drainage technology, underground horizontal well injection gas solvent extraction oil sand technology, etc. Among them, steam huff and puff and steam flooding technology and steam ass...

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Problems solved by technology

[0005] The purpose of the present invention is to develop a new method for mining oil sands, so as to avoid the use of water as a heat carrier in the prior art, and use boilers on the ground to generate steam and transport it to oil layers through pipelines, resulting in high energy consumption and high energy consumption in the oil sands mining process. Defects such as large energy loss, large water consumption, and non-environmental protection, and at the same time overcome the problems of high temperature, uneven temperature field, excessive heat loss, and long heating cycle in the process of electric heating mining oil sands

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