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Oil reservoir modification acid liquor and oil production method by using same

A technology of acid liquid and oil reservoir, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as low success rate

Inactive Publication Date: 2011-07-13
尚伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for decades, the success rate of acidizing is less than 35%, the success rate of fracturing is only 17%, and the reactive wells are all over the oil area
Especially for the acidification of clay mineral plugging in sandstone reservoirs, the success rate is lower, because after hydrofluoric acid, which can dissolve silicate minerals, is injected into the reservoir, the speed of dissolving sandstone framework particles is greater than that of dissolving clay. The clay minerals have not yet dissolved, and the rock skeleton collapses first

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] The proportioning components of the oil layer reforming acid liquid adopts:

[0035] Phosphorous acid 150kg; ammonium nitrate 200kg; potassium chloride 950kg;

[0036] Hydrochloric acid 250kg; Hydrofluoric acid 180kg; Formic acid 250kg;

[0037] Acetic acid 80kg; Citric acid 120kg;

[0038] Organic cationic polymer clay stabilizer 230kg;

[0039] 30kg of water.

[0040] A method for oil production through the oil layer reformed acid liquid is: connect the oil layer reformed acid liquid to the outside of the outer wall of the well shaft through the acid liquid pipeline provided in the wellbore, and when the wellbore is lowered to a certain depth, the acid liquid pipeline is used to drain the oil The oil layer reforming acid liquid is discharged from the wellbore, and the oil layer reforming acid liquid enters and acts on the oil reservoir.

[0041] The application of the oil layer reforming acid liquid is that the oil layer reforming acid liquid can be applied to the...

example 2

[0046] The proportioning components of the oil layer reforming acid liquid adopts:

[0047] Phosphorous acid 125kg; ammonium nitrate 180kg; potassium chloride 700kg;

[0048] Hydrochloric acid 180kg; Hydrofluoric acid 120kg; Formic acid 200kg;

[0049] Acetic acid 150kg; Citric acid 180kg;

[0050] Organic cationic polymer clay stabilizer 200kg;

[0051] 60kg of water.

[0052] The method for carrying out oil recovery by reforming the acid liquid in this oil layer is the same as that in Example 1.

[0053] In the sandstone oil layer of the third member of the Lower Tertiary Shahejie Formation in a well area of ​​an oilfield, industrial oil flow can generally be obtained in the initial oil test, but the production rate is extremely fast, and it drops below the industrial index within a few days, or even no liquid production. The analysis and research found that the reservoir has the characteristics of medium-high porosity and low permeability. This is because the proportion...

example 3

[0057] The proportioning components of the oil layer reforming acid liquid adopts:

[0058] Phosphorous acid 95kg; ammonium nitrate 160kg; potassium chloride 800kg;

[0059] Hydrochloric acid 200kg; Hydrofluoric acid 100kg; Formic acid 250kg;

[0060] Acetic acid 100kg; Citric acid 120kg;

[0061] Organic cationic polymer clay stabilizer 150kg;

[0062] 50kg of water.

[0063] The method for carrying out oil recovery by reforming the acid liquid in this oil layer is the same as that in Example 1.

[0064] In a certain oil field, the oil and gas performance is good. The initial oil test obtained a high-yield industrial oil flow of 198t / d, and a daily natural gas production of 17,800m 3 . However, well test data show that the surface pollution coefficient of the oil layer is as high as 9, indicating that although the oil layer has achieved high production, there is still serious pollution, and there is great potential for productivity increase. Microscopic analysis shows ...

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Abstract

The invention provides an oil reservoir modification acid liquor and an oil production method by using the same, belonging to the technical field of oilfield operation. The acid liquor is prepared from 50-200 parts of phosphorous acid, 100-300 parts of ammonium nitrate, 500-1000 parts of potassium chloride, 100-300 parts of hydrochloric acid, 50-200 parts of hydrofluoric acid, 100-300 parts of formic acid, 50-200 parts of acetic acid, 50-300 parts of citric acid, 50-300 parts of organic cationic polymer clay stabilizer and 0-100 parts of water. The oil reservoir modification acid liquor is applicable to various limestone and dolomite reservoirs, and various limestone, dolomite, mud and silica cemented sandstone reservoirs. The oil reservoir modification acid liquor is suitable for various reservoirs of which the porosity lower limit is 1% and the permeability lower limit is 0.1 millidarcy. The oil reservoir modification acid liquor can effectively dissolve caulking substances in pores of various reservoirs, improve the permeability of the reservoirs, and increase the yield of the crude oil.

Description

technical field [0001] The invention relates to the technical field of oilfield operations, in particular to an oil layer reforming acid solution and a method for oil exploitation through the acid solution. Background technique [0002] Generally, oil layer stimulation is acidification, fracturing and other measures to realize oil well production increase. As far as Shengli Oilfield is concerned, as many as 2,000 oil wells undergo oil layer stimulation every year. Due to the complexity of geological conditions of oil reservoirs, the success rate of this measure is less than 35%, especially for the acidizing treatment of sandstone oil reservoirs, the success rate (or known as effective operating wells) is only 10%. The main reason is that the performance of the reforming fluid does not match the properties of the oil layer, and there is no "prescribe the right medicine" for the problems existing in the oil layer. [0003] At present, the recovery rate of underground crude oi...

Claims

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Application Information

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IPC IPC(8): C09K8/72
Inventor 尚伟
Owner 尚伟
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