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Method for exploiting foam type super heavy oil

A foam-type, oil-layer technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of restricting the expansion of SAGD steam chamber, weakening the heating effect of steam on crude oil, affecting the development effect of SAGD, etc. The effect of mining effect, fast oil production speed and high recovery degree

Active Publication Date: 2019-07-09
PETROCHINA CO LTD
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Problems solved by technology

At the same time, dissolved gas is a non-condensable gas, which has good heat insulation effect, which will hinder the heat transfer from steam to oil phase, weaken the heating effect of steam on crude oil, limit the expansion of SAGD steam chamber, and affect the development effect of SAGD
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  • Method for exploiting foam type super heavy oil
  • Method for exploiting foam type super heavy oil
  • Method for exploiting foam type super heavy oil

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Embodiment Construction

[0034] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0035] The method for exploiting foamy super-heavy oil described in this application will be described in detail below in conjunction with the accompanying drawings. figure 1 It is a flow chart of the method steps for exploiting foamy super-heavy oil provided by an embodiment of the present application. Although the present application provides the operation steps of the method as shown in the following embodiments or drawings, more or fewer operation...

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Abstract

The invention discloses a method for extracting foam type super-heavy oil. The method includes the steps that drilling is conducted after the depths of a first horizontal well and a second horizontalwell are determined in the vertical direction in a to-be-extracted foam type super-heavy oil reservoir, and well completion is carried out on the first horizontal well and the second horizontal well in a thermal recovery mode, wherein the first horizontal well is located within a predetermined distance range below the second horizontal well, and the first horizontal well is close to the bottom ofthe oil reservoir with the distance being larger than one meter; depletion development is carried out at the same time by taking the first horizontal well and the second horizontal well as the producing wells; stratum pressure of the foam type super-heavy oil reservoir is obtained, and when the stratum pressure is lowered to preset pressure, a cold production period is finished, and the second horizontal well is replaced as a steam injection well; and steam is directly injected into the steam injection well, and the first horizontal well is used as the producing well for direct production. Bymeans of the method for extracting foam type super-heavy oil, the development effect of extracting of foam type super-heavy oil by utilizing SAGD can be improved.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a method for exploiting foam-type super-heavy oil. Background technique [0002] The descriptions in this section merely provide background information related to the disclosure in this application and may not constitute prior art. [0003] The crude oil in the foam oil type super heavy oil reservoir has high relative density, high viscosity, high asphaltene content, high heavy metal content, and high original dissolved gas-oil ratio, and foam oil flow can be formed during underground cold recovery. "Foamy oil" is a phenomenon of dispersed gas-liquid two-phase flow that occurs during the depletion of heavy oil reservoirs. Due to the high initial dissolved gas-oil ratio of foamy oil-type super-heavy oil reservoirs, underground crude oil can form foamy oil flows. Specifically, "foamy oil" means that the dissolved gas is not separated from the crude oil immediately after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/24E21B43/305
Inventor 杨朝蓬李星民陈和平刘章聪包宇沈杨
Owner PETROCHINA CO LTD
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