Method for improving application effect of SAGD technology in heterogeneous reservoir

Abstract

The invention provides a method for improving the application effect of an SAGD technology in a heterogeneous reservoir. The method for improving the application effect of the SAGD technology in the heterogeneous reservoir includes the steps that horizontal production well drilling and horizontal steam injection well drilling are completed, a plurality of branch wells which are vertically and upward arranged are dug in the horizontal segment of a horizontal steam injection well to form a vertical-well and horizontal-well combined structure, and after the branch wells are drilled, SAGD exploitation is conducted. By adopting the method for improving the application effect of the SAGD technology in the heterogeneous reservoir, the effects of applying the conventional dual horizontal well SAGDtechnology to the heterogeneous reservoir containing interlayers and vertical low-permeability physical property layers can be improved, wherein the influence of the interlayers and the vertical low-permeability physical property layers on vertical development of a steam cavity is reduced, the production speed and the gas-oil ratio of a project are increased, and the producing degree of the tailend of the horizontal well and the producing degree of the whole horizontal well are improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for improving the application effect of SAGD technology in heterogeneous reservoirs. Background technique [0002] The resources of ultra-heavy oil in the world are huge. As a cutting-edge technology for the development of heavy oil in the world, SAGD (Steam-Assisted Gravity Drainage, that is, steam-assisted gravity drainage) occupies a dominant position in Canadian oil sands mining. my country's Liaohe, Xinjiang Oilfields have also been applied on a large scale. The method utilizes horizontal wells and steam to effectively exploit heavy oil, super heavy oil and other resources. By continuously injecting high-quality water steam into the horizontal steam injection well, the latent heat of vaporization is released from the upper layer of the steam to heat the reservoir. Hirai output. As the reservoir fluid is continuously produced, the steam expands verti...

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Problems solved by technology

[0005] The purpose of this invention is to provide a method for improving the application effect of SAGD technology in heterogeneous reservoirs. A low-cost solution is proposed for problems such as low production degree and slow initial production rate. This method can improve the application of conventional double horizontal well SAGD in heterogeneous reservoirs containing interlayers and vertical low-permeability layers. The effect of the technology, including reducing the impact of interlayers and vertical low-permeability layers on the vertical development of the steam chamber, increasing production rate and project oil-gas ratio, enhancing the production at the end of the horizontal well and the overall production degree of the horizontal well

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