Method for exploiting super heavy oil through combination of auxiliary oil exploiting wells and steam assisted gravity drainage (SAGD)

A technology for super-heavy oil and oil production wells, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., and can solve the problems of difficult crude oil production in triangular areas

Inactive Publication Date: 2019-06-04
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for producing super-heavy oil by combining auxiliary oil production wells and SAGD, so as to solve the problem in the prior art that the crude oil in the triangular area is difficult to recover in the later stage of SAGD production

Method used

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  • Method for exploiting super heavy oil through combination of auxiliary oil exploiting wells and steam assisted gravity drainage (SAGD)
  • Method for exploiting super heavy oil through combination of auxiliary oil exploiting wells and steam assisted gravity drainage (SAGD)
  • Method for exploiting super heavy oil through combination of auxiliary oil exploiting wells and steam assisted gravity drainage (SAGD)

Examples

Experimental program
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Effect test

Embodiment 1

[0070] (1) Reservoir screening, the selected oil layer is 580m below the surface, the thickness of the continuous oil layer is 22m, the porosity of the oil layer is 0.31, the horizontal permeability is 1200md, the ratio of vertical permeability to horizontal permeability is 0.7, and the oil saturation is 0.72, there is no continuous mudstone and shale interlayer developed in the oil layer. The viscosity of degassed crude oil at 50°C is 45,000 centipoise.

[0071] (2) The distance between adjacent well groups in this reservoir is 70m, and the lengths of the first horizontal well section 111, the second horizontal well section 21 and the third horizontal well section 121 are all 500m. In the vertical direction, the production wells The first horizontal well section 111 of 11 is 2m away from the bottom of the oil layer, and the distance between the steam injection well 12 and the production well 11 is 5m; an auxiliary oil production well 20 is drilled in the middle of the two wel...

Embodiment 2

[0076] (1) Reservoir screening, the selected oil layer is 470m below the surface, the thickness of the continuous oil layer is 20m, the porosity of the oil layer is 0.29, the horizontal permeability is 986md, the ratio of vertical permeability to horizontal permeability is 0.65, and the oil saturation The viscosity of degassed crude oil at 50°C is 49,000 centipoise.

[0077] (2) The distance between adjacent well groups in this reservoir is 70m, and the lengths of the first horizontal well section 111, the second horizontal well section 21 and the third horizontal well section 121 are all 500m. In the vertical direction, the production wells The first horizontal well section 111 of 11 is 2m away from the bottom of the oil layer, and the distance between the steam injection well 12 and the production well 11 is 4m; an auxiliary oil production well 20 is drilled in the middle of the two well groups. In the vertical direction, the second water well 20 of the auxiliary oil producti...

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Abstract

The invention provides a method for exploiting super heavy oil through combination of auxiliary oil exploiting wells and steam assisted gravity drainage (SAGD). The method for exploiting the super heavy oil comprises the steps: S10, an oil reservoir is selected; S20, the auxiliary oil exploiting wells are drilled between adjacent well sets, and each well set comprises a production well and a gas injection well; S30, a viscosity reducing agent used for reducing the viscosity of crude oil is injected into the production wells and soaks the production wells, and the gas injection wells and the auxiliary oil exploiting wells adopt a huff and puff mode for production; and S40, after hot communication is established between the gas injection wells and the auxiliary oil exploiting wells, steam iscontinuously injected into the gas injection wells, and oil exploiting production is conducted through the production wells and the auxiliary oil exploiting wells. According to the method for exploiting the super heavy oil, the problem that in the prior art, the crude oil in a triangular area is very difficult to exploit in the later stage of SAGD production is solved.

Description

technical field [0001] The invention relates to the field of heavy oil production, in particular to a method for producing super heavy oil by combining auxiliary production wells and SAGD. Background technique [0002] Steam Assisted Gravity Drainage (SAGD) technology was invented by Professor Buter of Canada in 1978. This technology has been successfully applied in the exploitation of heavy oil reservoirs. The main principle of SAGD is to deploy two vertically parallel horizontal wells at the bottom of the oil layer, and continuously inject steam from the steam injection well at the upper part of the displacement to the oil layer to heat the oil layer and crude oil. The steam chamber in the oil layer continues to expand, and the steam exchanges heat with the crude oil in the oil layer. . The condensed water formed after the crude oil is heated and the viscosity-reduced crude oil and steam condenses flows downward under the force of gravity. Crude oil is extracted from pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/24E21B43/22
Inventor 罗池辉赵睿杨智陈河青刘刚
Owner PETROCHINA CO LTD
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