Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir

A technology for heavy oil reservoirs and well patterns, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the interference of two well rows, serious oil wall damage, lack of accurate judgment of the front edge of the fire line, etc. To achieve the effect of solving the serious gas channeling and improving the effect of fire flooding

Active Publication Date: 2016-05-04
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The design of injection-production well pattern is unreasonable: row flooding well row is deployed in the waist of monocline structure, resulting in serious gas channeling in the updip direction, serious interference between two well rows, low air utilization rate, and slow effect of fire flooding;
[0006] 2) The design of the injection-production layer is unreasonable: the ignition layer of the fire well is in the middle or upper part, and the entire well section of the oil well produces, and the configuration relationship cannot achieve the purpose of gravity drainage;
[0007] 3) Unreasonable control technology: Lack of correct under...

Method used

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  • Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir
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  • Well pattern and method for improving fire flooding effect of thick-layer heavy oil reservoir

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Effect test

Embodiment 1

[0059] This embodiment provides a well pattern for improving the fire flooding effect of thick heavy oil reservoirs. The structure layout of the well pattern is as follows figure 2 Shown.

[0060] In the above-mentioned well pattern, a row of fire wells are linearly deployed on the top of the monoclinic structure at block 3,618. There are 6 fire wells in the fire wells, and the horizontal well spacing between two adjacent fire wells is 75m (or 50m). ;

[0061] In the downward direction of the first row of fire well rows, a row of oil well rows (7 oil wells) parallel to it is deployed; the plane row distance between the oil well row and the fire well row is 105m, and there are two adjacent oil wells in the oil well row. The plane well distance between is 75-105m;

[0062] The ignition interval in the fire well is the area down the top of the oil layer. The thickness of this area accounts for 1 / 4 of the thickness of the entire oil layer (such as image 3 Shown);

[0063] The productio...

Embodiment 2

[0065] This embodiment provides a well pattern for improving the fire flooding effect of thick heavy oil reservoirs. The well pattern (such as Figure 4 (Shown) is obtained after rectifying the well pattern provided in the above comparative example 1.

[0066] 1) Shut in or plug the first row of oil wells located in the updip direction of the first row of fire wells (to suppress gas production in the updip direction);

[0067] 2) Stop gas injection to the second row of fire wells located in the downward dipping direction of the first row (to prevent interference with the fire discharge effect of the first row of fire wells in the upward dipping direction);

[0068] After such adjustments Figure 4 As shown, there is only one row of fire well rows in the well pattern, which are located in the high part of the monoclinic structure. The downward dip direction of the above fire well rows is two rows of oil well rows (labeled as the first row of oil well rows and the second row of oil we...

Embodiment 3

[0070] This embodiment provides a method for improving the fire flooding effect of thick heavy oil reservoirs. The method is carried out by using the well pattern provided in the above embodiment 1, and includes the following steps:

[0071] 1) In order to ensure that the fire drive is carried out in the high-temperature combustion mode with high displacement efficiency, it is necessary to ensure that the front of the fire drive maintains the advancing speed under high temperature combustion. The speed is taken as 8cm / d on site; The advancing speed of the edge estimates the reasonable gas injection speed of the fire well. In this example, a long tube experiment was carried out on the Gaosheng Oilfield, and the results showed that the combustion of 1m 3 Oil layer needs 300m 3 Air; according to this result, we set burning 1m 3 Oil layer needs 300m 3 For air, the advancing speed of the combustion front is 8cm / d, the thickness of the fuel layer is 20m, and the combustion sweep rate is ...

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Abstract

The invention provides a well pattern and a method for improving fire flooding effect of a thick-layer heavy oil reservoir. The well pattern is disposed on an oil reservoir whose geological structure is a uniclinal structure. The well pattern is characterized in that the well pattern comprises a fire well row and at least a row of oil well. The fire well row is on the high part of the uniclinal structure. The fire wells in the fire well row are disposed along the high part of the uniclinal structure in sequence. The oil well rows are in the uniclinal structure, and are below the fire well row, and are arranged along a downdip direction of the uniclinal structure in sequence. The two adjacent well rows are arranged in parallel. The invention also provides a method for improving fire flooding effect of a thick-layer heavy oil reservoir. The method comprises: injecting gas to the fire well on the high part of the oil reservoir structure, igniting an ignition layer section, start fire flooding oil extraction; and extracting oil from the oil well on the downdip direction. The technical scheme can fully use altitude differences of the geological structure of the thick-layer heavy oil reservoir to achieve an objective of gravity drainage.

Description

Technical field [0001] The invention relates to a well pattern and a method for improving the fire flooding effect of thick heavy oil reservoirs, and belongs to the technical field of oil exploitation. Background technique [0002] Fire-burning oil layer is a thermal recovery method to improve oil recovery. It has low cost, low energy consumption, high oil displacement efficiency, wide adaptability, broad prospects, and can realize crude oil upgrading, but its oil displacement mechanism is complicated and has Steam flooding, hot water flooding, flue gas flooding and other displacement mechanisms are difficult to control during the implementation process, resulting in a low on-site success rate. Most of its successfully developed oil reservoirs are thin-layer oil reservoirs, and fire flooding of thick massive heavy oil reservoirs similar to high-rise oil fields is a brand new exploration and practice. Take the Lianhua oil layer of the Gao 3618 block in the Gaosheng area of ​​the ...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/243
CPCE21B43/243E21B43/30
Inventor 江琴王卫东金兆勋李树山吴一尘鄢华玉张晓华孙娜
Owner PETROCHINA CO LTD
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