Oil treatment method

Abstract

The invention discloses an oil recovery treatment method, comprising the following steps: arranging a first vertical well; arranging four second vertical wells surrounding the first vertical well, the four second vertical wells are respectively located at the vertices of a quadrilateral; arranging and four second vertical wells The vertical wells are alternately arranged as four third vertical wells around the first vertical well. Inject air into the first vertical well and the second vertical well, so that the heavy oil in the oil layer flows into the third vertical well, and the third vertical well lifts the heavy oil to the surface; at the same time, the third vertical well discharges tail gas; The tail gas discharge is stable, and air is injected into the third vertical well so that the heavy oil in the oil layer flows into the first vertical well and the second vertical well, and the first vertical well and the second vertical well lift the heavy oil to the surface; at the same time, the second vertical well The tail gas is discharged from the straight well and the second straight well. By adopting the oil recovery treatment method of the present invention, the gas injection well and the production well can be effectively connected, greatly improving the production efficiency of fire flooding oil recovery, and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to an oil extraction treatment method. Background technique [0002] At present, in the process of heavy oil development, the steam huff and puff preheating oil layer is close to the economic limit, and there are few oil reservoirs that meet steam flooding and SAGD, so it is imminent to change the development mode of the oil layer. With the deepening of research, fire flooding has gradually developed and formed a set of mature technology. However, in the production process of fire flooding, it was found that nearly half of the injection wells and production wells were disconnected, which made the air injected into the injection wells unable to fully burn with the heavy oil in the oil reservoir to displace the crude oil. At the same time, the gas injection volume of fire flooding reservoirs is usually controlled according to the reservoir area controlled by the well group. If...

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Problems solved by technology

However, during the production process of fire flooding, it is found that nearly half of the injection wells and production wells are disconnected, which makes the air injected into the injection wells unable to fully burn with the heavy oil in the oil layer and displace the crude oil

At the same time, the gas injection volume of fire flooding reservoirs is usually controlled according to the reservoir area controlled by the well group. If the reservoir connectivity is poor, the fire line will only advance in one or a few directions, and the injected air volume will exceed the design volume. Gas channeling and uneven longitudinal and lateral spread of the reservoir lead to poor fire flooding effect, which brings great difficulties to the adjustment work in the later stage, which greatly affects the production efficiency of fire flooding oil recovery

[0003] For the above problems, no effective solution has been proposed

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