Method for reducing CO<2> flooding minimum miscible pressure

A carbon dioxide, miscible pressure technology, applied in earthwork drilling, production fluids, wellbore/well components, etc., can solve problems such as the impact of oil displacement effect, and achieve the effect of low cost and low consumption

Inactive Publication Date: 2016-03-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since most oil reservoirs in my country belong to continental deposits, which are different from marine deposits in foreign countries, not only CO 2 The minimum miscible pressure (MMP) of flooding is higher than the minimum miscible pressure of foreign marine sedimentary reservoirs, and the CO in most reservoirs in my country 2 The flooding MMP is greater than the fracture pressure of the formation, resulting in the CO 2 Most of the flooding can only be immiscible flooding, and the oil displacement effect is seriously affected

Method used

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  • Method for reducing CO&lt;2&gt; flooding minimum miscible pressure
  • Method for reducing CO&lt;2&gt; flooding minimum miscible pressure
  • Method for reducing CO&lt;2&gt; flooding minimum miscible pressure

Examples

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Embodiment 1

[0028] This embodiment provides a method for reducing the minimum miscible pressure of carbon dioxide flooding, the method is to 2 During miscible flooding, the mixed reducer I was dissolved in CO 2 in, with CO 2 At the same time, it is injected into the formation and mixed with the crude oil in the formation.

[0029] Wherein, the demixing agent I is a mixture of propanol, butanol and ethylenediamine, and the volume ratio of propanol, butanol and ethylenediamine in the mixture is 4:5:1. The injection volume of downmixing agent is CO 2 3.0% of mass.

[0030] The crude oil is Shengli crude oil, and the temperature of the crude oil is 60°C.

[0031] The method of reducing the minimum miscibility pressure of carbon dioxide flooding in this example is experimentally verified by observing the CO 2 State of crude oil and CO with demixing agent Ⅰ 2 The change trend of the state of crude oil and the pressure with the pressure, to prove that the addition of demixing agent Ⅰ can r...

Embodiment 2

[0045] This embodiment provides a method for reducing the minimum miscible pressure of carbon dioxide flooding, the method is to 2 During miscible flooding, the mixed reducer II was dissolved in CO 2 in, with CO 2 At the same time, it is injected into the formation and mixed with the crude oil in the formation.

[0046] Wherein, the demixing agent II is a mixture of methanol and ethylene glycol, and the volume ratio of methanol and ethylene glycol in the mixture is 7:3. The injection volume of downmixing agent is CO 2 3.0% of mass.

[0047] The crude oil is Jidong crude oil, and the temperature of the crude oil is 80°C.

[0048] Experimental verification is carried out on the method of reducing the minimum miscible pressure of carbon dioxide flooding in this embodiment:

[0049] Use a 5mL syringe to measure 5mL of Jidong crude oil at a temperature of 80°C, and inject it into the micro-injection pump of the high-pressure interfacial tensiometer, and set the temperature of ...

Embodiment 3

[0057] This embodiment provides a method for reducing the minimum miscible pressure of carbon dioxide flooding, the method is to 2 During miscible flooding, dissolve the mixed reducer III in CO 2 in, with CO 2 At the same time, it is injected into the formation and mixed with the crude oil in the formation.

[0058] Wherein, the demixing agent III is a mixture of ethanol, butanol and ethylenediamine, and the volume ratio of ethanol, butanol and ethylenediamine in the mixture is 5:3:2. The injection volume of downmixing agent is CO 2 4.0% of mass.

[0059] The crude oil is Jidong crude oil, and the temperature of the crude oil is 70°C.

[0060] The method of reducing the minimum miscible pressure of carbon dioxide flooding in this example is experimentally verified, and the CO 2 Oil displacement minimum miscible pressure and CO 2 The minimum miscibility pressure of oil displacement, thus proving that the addition of demixing agent can reduce CO 2 Oil displacement minimum...

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Abstract

The invention provides a method for reducing the CO<2> (carbon dioxide) flooding minimum miscible pressure. According to the method, during CO<2> miscible flooding, a miscible reducing agent is dissolved into CO<2>; the miscible reducing agent and the CO<2> are injected into the stratum at the same time and are mixed with crude oil in the stratum; the miscible reducing agent comprises one or combination of several materials from methanol, ethyl alcohol, ethanediol, propanol, ethylenediamine and butanol. The method for reducing the CO<2> (carbon dioxide) flooding minimum miscible pressure has the advantages that the CO<2> flooding minimum miscible pressure can be effectively reduced; the consumption of the miscible reducing agent is low; the cost is low; the popularization value is realized; and the powerful technical support is provided for the utilization of the CO<2> as resources in petroleum industry.

Description

technical field [0001] The invention relates to a method for reducing the minimum miscible pressure of carbon dioxide flooding, and belongs to the technical field of carbon dioxide flooding. Background technique [0002] With the sustained and rapid development of my country's national economy, the demand for oil is strong and consumption is increasing; for example, my country's oil consumption in 2013 was about 488 million tons, and in 2014 it was about 508 million tons. However, in 2013, my country's crude oil output was about 208 million tons, and in 2014, my country's crude oil output was only about 210 million tons. The domestic crude oil output has stagnated, leading to increasingly prominent contradictions between supply and demand. The reason is that, on the one hand, most of the oilfields in my country belong to continental deposits, the reservoirs are highly heterogeneous, and the water flooding recovery rate is low. Moreover, many oilfields have entered the middle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/164
Inventor 杨子浩李明远尹太恒王典林林梅钦董朝霞张娟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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