A Heavy Oil Cold Recovery Technology Applicable to Shallow Well Formation

Abstract

The invention relates to a heavy oil cold recovery process suitable for shallow well layers. The technical solution is: a reversing bypass valve is provided on the lower side wall of the oil pump of the oil pipe, and the gas generator is connected to the bottom of the oil pipe through a hydraulic switch and a reaction opener. The hydraulic switch corresponds to the oil production layer, and the gas generator Located in the lower part of the oil production layer, CaC2 is installed in the gas generator, and the CaC2 in the gas generator is controlled to react with water through the reaction opener, and the generated C2H2 gas is absorbed by the heavy oil in the oil production layer, and the heavy oil is diluted After that, it is extracted to the ground through oil pipelines and oil well pumps. The beneficial effects are: the production of the present invention is safe and reliable: through the use of the existing hydraulic switch, the production becomes more safe and reliable, the production is simple, and the formation will not be polluted; the economic benefit is good: the operation time is also short, and the mining efficiency is high; The oil is directly transported through the pipeline, which improves the transport efficiency and reduces the production cost.

Description

technical field [0001] The invention relates to a heavy oil recovery device and method, in particular to a heavy oil cold recovery process suitable for shallow well layers. Background technique [0002] In the process of oil exploitation, due to the different geological factors of the blocks, there are a large number of shallow heavy oil wells, such as: Tuha Oilfield in Xinjiang, Xinkan Oilfield in Karamay Oilfield, etc., and Shengli Oilfield Heavy Oil Plant in Dongying. There are a large number of large heavy oil wells. [0003] At present, for the production of heavy oil, the main methods used are the following common methods: (1) Steam injection, that is, injecting high-temperature and high-pressure water vapor or hot air from the wellhead. This method is commonly used, but this method is due to The injected hot gas, therefore, has higher requirements on the downhole packer. One is high temperature and high pressure. This kind of packer is difficult to manufacture and hi...

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Problems solved by technology

[0003] At present, for the production of heavy oil, the main methods used are the following common methods: (1) Steam injection, that is, injecting high-temperature and high-pressure water vapor or hot air from the wellhead. This method is commonly used, but this method is due to The injected hot gas, therefore, has higher requirements on the downhole packer. One is high temperature and high pressure. This kind of packer is difficult to manufacture and high in cost. In use, the temperature of the hot gas must reach more than 300°C , so there is a certain threat to the surrounding operators. In case of an accident, the consequences will be unimaginable; (2) Injecting a diluent, that is, a chemical method, for cold mining. The characteristics of this method are: there is no risk of gas injection , the oil recovery process is relatively smooth, but the disadvantages are: a large amount of chemical reagents are mixed into the heavy oil, which brings great inconvenience to the subsequent oil refining and chemical treatment. Therefore, this method is also used with caution; (3) Injection CO 2 , to reduce the viscosity of the heavy oil, which is also a gas injection method, and at the same time, it is similar to injecting a diluent, that is, the heavy oil absorbs CO 2 Finally, when refining, it is necessary to convert CO 2 Removing it also increases the follow-up processing and brings problems

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