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Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD)

A technology for heavy oil reservoirs and reservoirs, applied in the field of heavy oil reservoirs exploited by SAGD, can solve problems such as uneven development of medium and steam chambers, and achieve good economic benefits

Active Publication Date: 2016-06-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for exploiting heavy oil reservoirs by using SAGD to solve the problem of uneven development of the existing medium steam chamber along the horizontal section

Method used

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  • Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD)
  • Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD)
  • Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD)

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The main oil layer of the heavy oil reservoir in this example is buried shallowly, with an average buried depth of 300m, the original reservoir pressure of 2.8MPa, and the original reservoir temperature of 21°C; the viscosity of crude oil is high, and the viscosity of degassed crude oil at the reservoir temperature is 22× 10 4 mPa.s, the average effective thickness of the oil layer is 16m.

[0047] The mining method of the present embodiment comprises the following specific steps:

[0048] (1) Set up a horizontal injection-production well pattern in the production area of ​​the heavy oil reservoir, and set up a well pattern in the oil layer at the same plane position (the plane position refers to the vertical plane position, and the horizontal section of the injection well is located directly above the horizontal section of the production well). For injection well 1 and production well 2, the injection well 1 and production well 2 form an injection-production well grou...

Embodiment 2

[0055] The main oil layer of the heavy oil reservoir in this example is buried shallowly, with an average buried depth of 300m, the original reservoir pressure of 2.8MPa, and the original reservoir temperature of 21°C; the viscosity of crude oil is high, and the viscosity of degassed crude oil at the reservoir temperature is 22× 10 4 mPa.s, the average effective thickness of the oil layer is 16m.

[0056] The mining method of the present embodiment comprises the following specific steps:

[0057] (1) Set up a horizontal injection-production well pattern in the production area of ​​the heavy oil reservoir, and set up a well pattern in the oil layer at the same plane position (the plane position refers to the vertical plane position, and the horizontal section of the injection well is located directly above the horizontal section of the production well). For injection well 1 and production well 2, the injection well 1 and production well 2 form an injection-production well grou...

Embodiment 3

[0064] The main oil layer of the heavy oil reservoir in this example is buried shallowly, with an average buried depth of 300m, the original reservoir pressure of 2.8MPa, and the original reservoir temperature of 21°C; the viscosity of crude oil is high, and the viscosity of degassed crude oil at the reservoir temperature is 22× 10 4 mPa.s, the average effective thickness of the oil layer is 16m.

[0065] The mining method of the present embodiment comprises the following specific steps:

[0066] (1) Set up a horizontal injection-production well pattern in the production area of ​​the heavy oil reservoir, and set up a well pattern in the oil layer at the same plane position (the plane position refers to the vertical plane position, and the horizontal section of the injection well is located directly above the horizontal section of the production well). For injection well 1 and production well 2, the injection well 1 and production well 2 form an injection-production well grou...

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Abstract

The invention provides a method for exploiting a heavy oil reservoir through steam-assisted gravity drainage (SAGD). The SAGD includes the process of conducting oil recovery by adopting an injection-production well group. The injection-production well group comprises at least one pair of adjacent injection well and production well. The injection well is provided with an injection well horizontal section arranged in an oil layer of the heavy oil reservoir. The production well is provided with a production well horizontal section arranged in the oil layer. The injection well horizontal section is located above the production well horizontal section. During the middle and later periods of the SAGD, the method further comprises the steps that S1, a vertical well is arranged in the growth position of at least part of a steam-free chamber above the injection well horizontal section; and S2, steam is injected into the vertical well and the injection well, and oil recovery is carried out through the production well. According to the method, the vertical well is arranged in the growth position of the steam-free chamber during the later period of the SAGD, the steam is injected into the vertical well, and then steam-free chamber growth is promoted through heat of the steam, so that the effect of uniform growth of a steam chamber in the horizontal sections is achieved.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for utilizing SAGD to exploit heavy oil reservoirs. Background technique [0002] Steam-assisted gravity drainage technology (abbreviation: SAGD) was invented by Canada's Buter in 1978, and has been successfully applied in heavy oil reservoirs in Canada's oil sands mining area and my country's Liaohe Oilfield and Xinjiang Oilfield. The principle is to deploy horizontal well groups stacked one above the other in the same oil layer, and inject high-dryness steam into the upper steam injection well. Because the density of the steam is much lower than that of crude oil, the steam overlaps upwards in the formation to form a steam cavity. With the continuous injection of steam , the steam chamber continuously expands upwards and sideways, and exchanges heat with the crude oil in the oil layer. The viscosity of the heated crude oil is reduced, and the condensed water flow...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 何万军木合塔尔王延杰吴永彬杨智马鸿杨柳师耀利
Owner PETROCHINA CO LTD
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