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Electric detection identifying method for sand stone oil field oil layer lower water flooded oil layer during high water content developing period

An identification method and oil layer technology, applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems such as high water-bearing layer misshooting, achieve obvious effects, considerable economic benefits, and avoid high water-cut effects

Inactive Publication Date: 2007-04-11
DAQING OILFIELD CO LTD
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Problems solved by technology

[0005] 3. At present, the low water-flooded layer and the medium water-flooded level are mixed together to explain, and it is easy to misshoot the high water-bearing layer together during perforation, resulting in high water content in the initial stage of perforation

Method used

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specific Embodiment approach 1

[0013] Specific implementation mode 1: In this implementation mode, electrical measurement and identification of low water-flooded oil layers in sandstone oilfields in the high water-cut development period are carried out according to the following method:

[0014] 1. Classification of flooding levels:

[0015] The classification standard of flooding level in the original plan:

[0016] Not submerged: 0.0%≤S W ≤10%; 0.0%≤ΔS W ≤12%;

[0017] Low flooding: 10%W ≤40%; 12%W ≤24%;

[0018] Medium flooding: 40%W ≤80%; 24%W ≤36%;

[0019] High flooding: S W >80%; ΔS W >36%.

[0020] In this embodiment, the four levels of high, medium, low, and low are subdivided into six levels: extra high, high, medium, low, low, and low, and the details are as follows:

[0021] Not submerged: 0.0%≤S W ≤10%; 0.0%≤ΔS W ≤10%;

[0022] Low flooding: 10%≤S W ≤40%; 10%≤ΔS W ≤20%;

[0023] Low flooding: 40%≤S W ≤50%; 20%≤ΔS W ≤30%;

[0024] Medium flooding: 50%≤S W ≤80%; 30%≤ΔS W ≤40%; ...

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Abstract

The electrically low water flooding oil layer measuring and identifying method for sandstone oil field in developing period belongs to the field of petroleum extracting technology. The method of the present invention includes the following steps: 1. defining a low water flooding grade based on the current water saturation SW and the water saturation difference DSW: SW 40-50 % and DSW 20-30 %, where DSW=SW-SWb, with SWb being the original water saturation; and 2. electrically measuring and identifying the low water flooding oil layer with relatively higher resistance. The present invention marks off a low water flooding grade to favor to extracting residual oil.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and relates to an electrical measurement identification method for the water flooding condition of oil layers in sandstone oilfields. Background technique [0002] At present, the water flooding status of oil layers in sandstone oilfields is generally described by four levels: high, medium, low, and not, and the criterion for low water flooding is 10%≤S W ≤40%(S W Current water saturation), 12%≤ΔS W ≤24% (ΔS W The difference between the current water saturation and the original water saturation). This standard is not applicable to oilfield development in high water cut period, mainly reflected in the following aspects: [0003] 1. At present, reservoir engineers generally think that the low and non-water-flooded levels in the water-flooded level are the remaining oil, and the medium and high water-flooded levels are non-remaining oil. After the oil field enters the high water-cut develo...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 贾春雨陈刚胡广斌李淑梅
Owner DAQING OILFIELD CO LTD
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