Method for exploiting high-inclined-angle heavy oil reservoir by plane gravity displacement

A heavy oil reservoir, gravity flooding technology, applied in the direction of fluid production, earthwork drilling, wellbore/well components, etc., to achieve the effects of high oil washing efficiency, high plane sweep coefficient, and improved industrial value

Active Publication Date: 2017-12-05
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

So far, there is no report on the development of heavy oil reservoirs with crude oil viscosity greater than 50mPa·s under formation conditions using top gas injection gravity flooding.

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  • Method for exploiting high-inclined-angle heavy oil reservoir by plane gravity displacement
  • Method for exploiting high-inclined-angle heavy oil reservoir by plane gravity displacement
  • Method for exploiting high-inclined-angle heavy oil reservoir by plane gravity displacement

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Embodiment Construction

[0029] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] A method for exploiting high-dip heavy oil reservoirs by planar gravity flooding, such as figure 1 shown, including the following steps:

[0031] Step 1. Select oil reservoir;

[0032] Step 2, set vertical well square well pattern in the production area of ​​the reservoir for steam huff and puff production, such as figure 2 As shown, the square well pattern of vertical wells contains multiple vertical wells, and multiple vertical wells form multiple well rows, and the adjacent four vertical wells are distributed in a square shape;

[0033] Step 3. A row of vertical wells located at the highest structural position in the square well pattern of vertical wells is used as injection well ...

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Abstract

The invention provides a method for exploiting a high-inclined-angle heavy oil reservoir by plane gravity displacement. According to the method for exploiting the high-inclined-angle heavy oil reservoir by plane gravity displacement, a plane gravity oil displacement mode using steam injection as a major measure and non-condensable gas injection as an auxiliary measure is designed. Steam and non-condensable gas are proportionally injected; high-temperature hot water and non-condensable gas in the stratum can easily form a secondary gas cap and a secondary water zone with the obvious spatial variation effects due to the density differences; the high-temperature secondary water zone provides a heating resource for a downstream cold oil zone; and the breakthrough of the injection gas towards a production well in a low structure position is prevented. Meanwhile, the oil reservoir integral scaled development is realized; the unidirectional linear staggered well network development is used; and the plane conformance coefficient and the recovery efficiency are improved.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for exploiting high-dip heavy oil reservoirs by plane gravity flooding. Background technique [0002] The world is rich in heavy oil resources, how to efficiently develop and utilize heavy oil resources has become a topic of common concern in the petroleum industry. Part of the anticline structure or fault nose structure controls the formation dip angle of the oil reservoir is 8°-20°, the viscosity of underground crude oil is between 50mPa·s-5000mPa·s, and some have relatively active edge and bottom water. After steam huff and puff is used in such reservoirs, a large amount of "attic oil" will often be retained in the high parts of the reservoir and the middle and upper parts of the oil layer, and the degree of staged recovery is generally low. Under the current economic and technical conditions, there is no feasible technology to continue the production. For this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/30
Inventor 师耀利赵仁保
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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