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Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof

A miscible pressure and immiscible flooding technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of oil-soluble surfactants that are difficult to fully contact with crude oil, high cost, and large dosage, so as to reduce invalid injection , increase stability, increase the effect of oil washing ability

Inactive Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above method, CO 2 The method of adding liquefied petroleum gas as a regulator to reduce the minimum miscible pressure has the disadvantages of high cost and large dosage; while the oil-soluble surfactant injected into the oil well is easy to channel after the heterogeneous reservoir surfactant is injected into the oil well, The disadvantage that oil-soluble surfactants are difficult to fully contact with crude oil

Method used

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  • Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof
  • Adjustor for reducing minimum miscible pressure of CO2 non-miscible flooding and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Configuration regulator

[0028] 0.2g toluene, 94.8g CH 3 -(CH 2 ) 4 -CH 3 , 5g of dodecyl dimethyl sulfopropyl betaine, mixed evenly as a miscible pressure regulator for use, weighed 99.9g of a certain crude oil, weighed 0.1g of the regulator and dissolved it in the above crude oil, and obtained the mass of the regulator. Crude oil sample at a concentration of 0.1%.

[0029] (2) Crude oil and CO 2 interfacial tension measurement

[0030] During the experiment, crude oil and CO 2 The interfacial tensiometer adopts French TRACKER H interfacial tension / rheometer, adopts No. 18 needle, and measures CO under the condition of 100°C and 16MPa. 2 The interfacial tension between crude oil and crude oil is 5.32mN / m; measure CO at 100°C and 16MPa 2 The interfacial tension with the above crude oil sample containing the regulator with a mass concentration of 0.1% is 4.12mN / m, and the interfacial tension reduction rate is 22.56%.

[0031] (3)CO 2 Determination of minim...

Embodiment 2

[0037] (1) Configuration regulator

[0038] 0.3g toluene, 94.4g CH 3 -(CH 2 ) 4 -CH 3 , 5g dodecyl dimethyl sulfopropyl betaine, 0.3g ethylene glycol butyl ether, mix well as a miscible pressure regulator for later use. Weigh 99.8g of a certain crude oil, weigh 0.2g of regulator and dissolve in the above crude oil to obtain a crude oil sample containing regulator with a mass concentration of 0.2%.

[0039] (2) Crude oil and CO 2 interfacial tension measurement

[0040] During the experiment, crude oil and CO 2The interfacial tension meter adopts the French TRACKER H interfacial tension / rheometer, using a 18th needle to measure CO under the condition of 100°C and 18MPa. 2 The interfacial tension between crude oil and crude oil is 4.35mN / m; measure CO at 100°C and 18MPa 2 The interfacial tension with the above-mentioned crude oil sample containing the regulator with a mass concentration of 0.2% is 3.38mN / m, and the reduction rate of the interfacial tension is 22.30%.

...

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Abstract

The invention relates to an adjustor for reducing the minimum miscible pressure of CO2 non-miscible flooding and an application method thereof and belongs to the technical field of enhancing the oil recovery by CO2 flooding in an oil field. The adjustor is prepared from benzene homologs and derivates, ether matters, an oil soluble surfactant and a foaming agent. The application method comprises the following steps: (1) before carrying out CO2 flooding, injecting the adjustor into a reservoir by virtue of an injection well; and then braising the well till the adjustor is fully contacted with crude oil and dissolves; and (2) continuously injecting CO2 into the injection well till the gas-oil ratio in an output well exceeds the dissolved gas oil ratio under a formation condition. The adjustor provided by the invention has the beneficial effects that the adjustor can generate foam with CO2 to control the fluidity; meanwhile, as the benzene homologs and derivates, ether matters and oil soluble surfactant dissolved mutually promote so as to reduce the interfacial tension between CO2 and crude oil, so that the minimum miscible pressure of CO2 flooding is reduced, and the oil recovery of the CO2 flooding is improved to a great extent.

Description

technical field [0001] The invention relates to a method for reducing CO 2 Regulator for immiscible flooding minimum miscible pressure and its application method, belonging to oil field CO 2 Flooding enhanced oil recovery technical field. Background technique [0002] Studies at home and abroad have shown that the injection of CO 2 It can maintain reservoir pressure, reduce crude oil viscosity, improve gas-oil interfacial tension, and achieve the purpose of miscible and near-miscible flooding. According to the 2010 statistics of American Oil&Gas Journal magazine, CO 2 Flooding has become the EOR method with the largest oil production in tertiary oil recovery, accounting for 42.4% of the total oil recovery. Most foreign oil reservoirs are dominated by miscible flooding, accounting for 42.4% of the total oil recovery. 2 97% of projects abroad CO 2 Oilfields such as Daqing, Zhongyuan, and Shengli have successively carried out CO 2 In the oil flooding test, from the perspe...

Claims

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Application Information

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IPC IPC(8): C09K8/594
CPCC09K8/594
Inventor 李遵照林伟民吴莎黄丽仙李晓东刘晓平吴发英周迅
Owner CHINA PETROLEUM & CHEM CORP
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