Super heavy oil steam cavity development method

Abstract

The invention provides a super heavy oil steam cavity development method. The method is used for an oil reservoir developed by steam-assisted gravity drainage of double horizontal wells, and comprisesthe following steps of plugging a high-permeability area of the oil reservoir; injecting high-pressure fluid into a non-high-permeability area of the oil reservoir through the double horizontal wellsto expand capacity; and injecting steam into the double horizontal wells to remove blocking of the high-permeability area and extract oil. According to the technical scheme, for the oil reservoir developed by steam-assisted gravity drainage of the double horizontal wells, the high-permeability area of the oil reservoir is blocked firstly, then the high-pressure fluid is injected into the non-high-permeability area of the oil reservoir through the dual horizontal wells, and therefore, a steam cavity can be expanded; and then the steam is injected into the dual horizontal wells, so that on onehand, blocking of the high-permeability area can be removed, and on the other hand, as the steam cavity is enlarged, the viscosity of more super heavy oil can be reduced, the utilization degree of thesuper heavy oil reservoir can be improved, and the production effect is improved.

Description

technical field [0001] The invention relates to the technical field of oil reservoir exploitation, in particular to a method for developing a super-heavy oil steam cavity. Background technique [0002] The production effect of double horizontal well SAGD (Steam Assisted Gravity Drainage) to develop super heavy oil reservoirs mainly depends on the size of the steam chamber. Affected by the heterogeneity of the reservoir, it is difficult to ensure that the steam chambers develop uniformly. The steam chambers of the SAGD well groups in some oilfields are unevenly developed, and some of them develop to the top and expand horizontally, and some are still rising vertically. The degree of damage is also different. In severe cases, there is a phenomenon that some well sections do not develop steam chambers. Therefore, the oil production rate and recovery factor of the well group are affected, and the overall development effect is reduced. [0003] At present, there is no effective...

AI Technical Summary

Problems solved by technology

Affected by reservoir heterogeneity, it is difficult to ensure the uniform development of steam chambers. The steam chambers of SAGD well groups in some oilfields are unevenly developed, showing a composite form in which some develop to the top and expand horizontally, and some still rise vertically. There are also different degrees, and when it is severe, there is a phenomenon that the steam chamber is not developed in some well sections

Therefore, the oil recovery rate and recovery factor of the well group are affected, and the overall development effect is reduced.

[0003] At present, there is no effective solution to improve the development degree of super-heavy oil steam chamber in heterogeneous reservoirs, which affects the production degree of the reservoir

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