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Experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding

A nanofluid and heavy oil reservoir technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of reduced plane and vertical sweep coefficient, poor development effect, high viscosity of heavy oil, etc. To achieve the effect of expanding the longitudinal sweep coefficient, inhibiting gas channeling and gravity overriding, and improving the expansion of crude oil

Active Publication Date: 2019-08-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high viscosity of heavy oil, CO 2 During the process of gas-water alternating flooding, gas channeling and gravity overriding are very easy to occur, which reduces the horizontal and vertical sweep coefficients, and the development effect is poor

Method used

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  • Experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding
  • Experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding
  • Experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Such as figure 1 shown.

[0087] A hybrid nanofluid alternating CO in heavy oil reservoirs 2 Microbubble flooding experimental device, including high-precision constant-speed constant-pressure pump (1), CO 2 Container (2), active oil container (3), simulated formation water container (4), mixed nanofluid container (5), control valve (6), pressure gauge (7), lower injection port (8), middle injection port (9), upper injection port (10), inlet cover plate (11), bolt (12), sealing ring (13), outer body (14), first pressure measuring point (15), second pressure measuring point ( 16), the third pressure measuring point (17), outlet cover plate (18), mining outlet (19), back pressure valve (20), back pressure control system (21), gas-liquid separator (22), electronic balance (23), gas metering system (24), vacuum pump (25), constant temperature box (26), computer (27), pressure acquisition system (28), displacement model (29), filter screen (30), CO 2 Microbubble generato...

Embodiment 2

[0097] Mixed nanofluids alternate CO in heavy oil reservoirs as described above 2 The experimental method of the microbubble flooding experimental device comprises the following steps:

[0098] 1) Install and fill the displacement model with quartz sand.

[0099] 2) Prepare fluids for injection, including live oil, simulated formation water, mixed nanofluids and CO 2 gas.

[0100] 3) Empty the air in the displacement model to make the displacement model a vacuum state.

[0101] 4) Inject simulated formation water and live oil, and measure the porosity, permeability and initial oil saturation of the displacement model.

[0102] 5) Heavy oil reservoir depletion production stage: reduce the displacement model pressure to the target reservoir pressure. During the pressure drop process, the oil production, gas production and the pressure of each pressure measuring point are recorded, and the cumulative production gas-oil ratio and recovery degree in the depletion production sta...

Embodiment 3

[0154] Experimental equipment is identical with embodiment 1 in the present embodiment, and the difference of its experimental method and embodiment 2 is:

[0155] In the step 4), the amount of simulated formation water injected into the saturated simulated formation water process is 1108.97cm 3 , so the displacement model porosity is 36.02%.

[0156] The permeability data of simulated formation water at different injection rates are shown in Table 2.

[0157] Permeability under different injection rates in Table 2 Example 3

[0158]

[0159] Then the final permeability of the displacement model is 6.93 μm 2 .

[0160] The original reservoir pressure is 8.7MPa, the injected active oil volume V 油注 and the volume of crude oil produced V 油采 1670.67cm respectively 3 and 639.72cm 3 , so the initial oil saturation is S oi = 92.96%.

[0161] In the step 5), the target reservoir pressure is 6MPa. During the pressure drop process, the oil production, gas production and the...

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Abstract

The invention discloses an experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding. The experimental device and experimental method forthickened oil pool mixed nano-fluid alternating CO2 microbubble flooding introduces mixed nano-particles and combines the advantages of CO2 microbubbles, the phenomena of gas channeling and gravity override of a thickened oil pool occurred during conventional CO2 gas-water alternate flooding can be effectively controlled through a mode of alternating injection, and the recovery efficiency of thethickened oil pool is improved. Compared with CO2 gas, dissolving and diffusing abilities of the CO2 microbubbles are greater in crude oil, buoyancy is smaller, thickened oil viscosity can be better reduced, the volume of thickened oil is expanded, and the sweep coefficient is increased; the mixed nano-fluid can fully combine the advantages of various nano-particles, wettability of oil pull rockscan be changed, the oil-water interfacial tension can be reduced, and the oil washing efficiency is improved; and in addition, the experimental device and experimental method for thickened oil pool mixed nano-fluid alternating CO2 microbubble flooding adopts the method of injecting a mixed nano-fluid slug on the upper part of an oil pool and a CO2 microbubble slug on the lower part, controlling ofthe phenomena of the gas channeling and the gravity override and improvement of the vertical sweep coefficient are helped.

Description

technical field [0001] The invention relates to a heavy oil reservoir mixed nanofluid alternating CO 2 A micro-bubble flooding experimental device and an experimental method belong to the technical field of heavy oil reservoir exploitation. Background technique [0002] According to statistics, the world's heavy oil reserves are about 100 billion tons, accounting for a relatively large proportion of oil and gas resources. my country's proven and controlled heavy oil reserves are more than 1.9 billion tons, mainly distributed in more than a dozen oil fields such as Liaohe, Xinjiang, and Shengli. In addition, with the internationalization of my country's oil and gas exploration and development, a large number of foreign heavy oil resources need to be developed urgently. Therefore, under the condition that the exploration degree of conventional oil and gas resources is continuously improved and the development difficulty is increasing, heavy oil has become an important oil an...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22E21B47/00
CPCE21B43/164E21B47/00
Inventor 孙晓飞张艳玉陈广鹏刘泰霖刘云龙施昱昊胡航谢孟珂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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