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Qualitative and quantitative analysis method of indoor CO2 oil displacement rule

A quantitative analysis, CO2 technology, applied to the analysis of materials, measuring devices, instruments, etc.

Active Publication Date: 2018-11-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing technology cannot clearly distinguish the indoor CO 2 In order to solve the problem of channeling law of driving gas, a kind of indoor CO 2 Qualitative and quantitative analysis method of oil displacement law, by establishing gas-oil ratio and CO 2 The relationship curve of injection volume, according to the numerical value of the produced gas-oil ratio and the change of the color of the produced liquid, divides the CO 2 Different stages in the gas channeling process, and then judge the gas channeling law according to the changes in different stages

Method used

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  • Qualitative and quantitative analysis method of indoor CO2 oil displacement rule
  • Qualitative and quantitative analysis method of indoor CO2 oil displacement rule
  • Qualitative and quantitative analysis method of indoor CO2 oil displacement rule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a figure 1 Indoor CO as shown 2 The qualitative and quantitative analysis method of oil displacement law includes the following steps:

[0031] Step 1) select the core to dry, vacuumize, and then fill the pores of the core with formation water;

[0032] Step 2) Simulate live CO 2 The temperature and pressure of oil displacement, inject crude oil into the pore entrance of the core until all the pore exit of the core is crude oil. The experimental temperature range is 20°C-120°C and the pressure range is 2MPa-35MPa. By controlling the experimental temperature and pressure to achieve gaseous CO 2 immiscible displacement, supercritical CO 2 immiscible displacement, supercritical CO 2 Near miscible displacement and supercritical CO 2 Miscible displacement;

[0033] Step 3) Start injecting CO into the pore entrance of the core 2 , while recording CO 2 The injection rate, the oil production rate and the gas production rate at the core pore out...

Embodiment 2

[0046] On the basis of Example 1, this example provides an indoor CO 2 Qualitative and quantitative analysis method of oil displacement law, select natural outcrop homogeneous core, conduct CO 2 Continuous gas flooding experimental research, set the back pressure to 5MPa, and analyze the change of gas-oil ratio in the process of displacement. Specific steps are as follows:

[0047] Step 1) selecting a natural outcrop homogeneous core to dry, vacuumize, and then fill the pores of the core with formation water;

[0048] The apparent volume of the core is calculated by its length, width and height. When calculating the pore volume of the core, first vacuumize the core, and then inject formation water into its inlet until the formation water comes out from the outlet of the core. The volume of the injected formation water is the volume of the core. pore volume;

[0049] Step 2) Control the experimental temperature to the reservoir temperature of 86.2°C, control the pressure at ...

Embodiment 3

[0060] On the basis of Example 1, this example provides an indoor CO 2 Qualitative and quantitative analysis method of oil displacement law, select natural outcrop homogeneous core, conduct CO 2 Continuous gas flooding experimental research, set the back pressure to 15MPa, and analyze the change of gas-oil ratio in the process of displacement.

[0061] Step 1) selecting a natural outcrop homogeneous core to dry, vacuumize, and then fill the pores of the core with formation water;

[0062] The apparent volume of the core is calculated by its length, width and height. When calculating the pore volume of the core, first vacuumize the core, and then inject formation water into its inlet until the formation water comes out from the outlet of the core. The volume of the injected formation water is the volume of the core. pore volume;

[0063] Step 2) Control the experimental temperature to the reservoir temperature of 86.2°C, control the pressure at the outlet end of the rock core...

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Abstract

The invention provides a qualitative and quantitative analysis method of an indoor CO2 oil displacement rule. The method comprises the following steps: performing vacuum-pumping on a rock core, filling the stratum water, and then injecting crude oil, recording the CO2 injection amount, the produced quantity of crude oil, and the produced amount of gas, taking the CO2 injection amount as an abscissa, and taking a produced gas-oil ratio as an ordinate to establish an output characteristic curve. The method establishes a curve of the gas-oil ratio and the CO2 injection amount, and analyzes the color change of the produced liquid and the mass percentage change of C3-C8 in the produced liquid, a CO2 oil displacement process can be qualitatively and quantitatively divided into three different stages: a gasless oil recovery stage, a gas appearing stage, and a gas fleeing stage, the CO2 oil displacement and gas fleeing rules are discriminated according to the change of parameter indexes in different stages, and the recovery efficiency mechanism is increased, and the method has important guidance meaning for CO2 oil displacement.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an indoor CO 2 Qualitative and quantitative analysis method of oil displacement law. Background technique [0002] As early as the 1950s and 1960s, a large number of gas flooding field experiments were carried out in the United States and Canada. Due to abundant gas sources, CO 2 Miscible flooding has become an important and mature method of enhancing oil recovery in the United States, Canada and other countries; in the 1970s, CO 2 The flooding technology has been greatly developed, and countries such as the United States and the former Soviet Union have carried out a large number of CO 2 Flooding industrial test, and achieved obvious economic benefits, the recovery rate can be increased by 15% to 25%, with more CO 2 The discovery of gas reservoirs and the rise in crude oil prices; in the 1990s, CO 2 According to the statistical results of Oil and Gas Magazine ...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 刘笑春黎晓茸杨棠英马丽萍谭俊领王石头毕卫宇王伟罗政权杨飞涛
Owner PETROCHINA CO LTD
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