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Foam flooding evaluation device and evaluation method thereof

A technology of foam flooding and evaluation device, which is applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as lack of basic and accurate and stable indoor simulation experimental devices, uncontrollable gas-liquid ratio, and inability to guarantee gas-liquid ratio. , to achieve the effect of good simulation effect, reliable working performance and reasonable design

Active Publication Date: 2015-11-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device uses an injection pump to control the gas flow rate. After the pressure at the inlet end of the porous medium is transmitted to the foam generator, due to the difference in compressibility between gas and liquid, the amount of liquid entering will be greater than that of gas, resulting in more liquid entering than gas. The amount of inflow and gas-liquid ratio cannot be controlled, which affects the evaluation effect of foam control and flooding
Although this device can use double core tubes to study the split flow of foam, the fluid cannot flow between layers in the model, so it cannot simulate the deep liquid flow diversion of foam in porous media
In addition, some experimental devices do not have a foam generator, and the gas and foaming liquid are directly injected into the core model through the six-way valve at the same time, and the gas-liquid ratio is even more uncertain.
In recent years, more research on foam profile control technology has focused on foam formulation, performance evaluation, and profile control field tests. There are still deficiencies in research on the flow law and plugging mechanism of foam in porous media, especially It is the lack of basic, accurate and stable indoor simulation experimental equipment and effective experimental methods

Method used

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  • Foam flooding evaluation device and evaluation method thereof
  • Foam flooding evaluation device and evaluation method thereof
  • Foam flooding evaluation device and evaluation method thereof

Examples

Experimental program
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Effect test

example 1

[0042] Example 1 (foam flooding evaluation device)

[0043] A foam flooding evaluation device, including a foam generating device, a liquid supply device, a core simulation device and a data acquisition system, wherein:

[0044] The foam generating device comprises a gas storage cylinder 1, a buffer gas cylinder 2, a gas flow controller 6, a foam generator 7, a foam storage tank 8 and a screw pump 9 which are sequentially communicated through a connecting pipeline;

[0045] The liquid supply device includes a piston container 3 for foaming liquid, a piston container 4 for formation water, a piston container 5 for crude oil, and a plunger pump 22. The plunger pump 22 is connected to the The inlet end of the piston container 3 for containing the foaming liquid, the piston container 4 for containing formation water, and the piston container 5 for containing crude oil are connected, and the outlet end of the piston container 3 for containing the foaming liquid is connected to the ...

example 2

[0053] Example 2 (optimization experiment of foam control injection parameters)

[0054] (1) Connect the experimental device: Connect the various components of the experimental device such as figure 1 Connect as shown, and check whether the airtightness of each pipeline and each valve is good, and whether the data acquisition system is working normally. The three-layer square core model with different permeability is fixed with a core holder. The size of the three-layer square core model with different permeability is 4.5cm×4.5cm×30cm. The three-layer core model is passed through conventional According to the rock gas permeability measurement method, the permeability of the three-layer core along the simulated liquid flow direction is 3012×10 -3 μm 2 , 986×10 -3 μm 2 and 153×10 -3 μm 2 , that is, the three-layer core model is used to simulate the heterogeneous reservoir conditions with high-permeability layers, medium-permeability layers and low-permeability layers respe...

example 3

[0073] Example 3 (foam injection performance test)

[0074] (1) Experimental device connection: according to the attached figure 1 Connect the experimental device, check the airtightness of pipelines and valves, check whether the data acquisition system is working normally, keep the valves closed, adjust the liquid level of the metering cylinder to 0, and select a single sand-filled pipe model with different permeability for the core model. See attached table 3 for the core parameters, and check the sealing state of the core model.

[0075] (2) Core model preprocessing:

[0076] (i) A single core model filled with 30-200 mesh quartz sand is used, and the dry weight is measured in m 1 , evacuate the sand-filled core model and keep it for 4-6 hours;

[0077] (ii) The core model is saturated with formation water: open the seventh valve, the ninth valve and the twelfth valve, open the fourth valve and start the plunger pump 22, inject formation water into the core model 13 with...

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Abstract

The invention discloses a foam flooding evaluation device and an evaluation method thereof. The foam flooding evaluation device comprises a foam generation device, a liquid supplying device, a rock core simulation device and a data acquisition system. The evaluation method using the foam flooding evaluation device comprises the following steps: carrying out saturated simulated stratum water pre-treatment on selected rock core models with different penetration rates, sequentially carrying out raw oil saturation, stratum water injection, foam injection and foam flooding; and controlling injection parameters in an injection process to obtain the rock core models aiming at the different penetration rates to obtain an optimal foam injection foam corresponding to the maximum raw oil recovery efficiency. The foam flooding evaluation device and the evaluation method thereof, disclosed by the invention, have a reliable working performance and a good simulation effect; the corresponding evaluation method can be used for researching recovery efficiency improving mechanisms including transferring and flooding control and the like of foam in a foam flooding process.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development experiment equipment, in particular to a foam flooding evaluation device and an evaluation method thereof. Background technique [0002] The foam system has the characteristics of high apparent viscosity, large blockage but not small blockage, water blockage without oil blockage, can effectively block medium and high permeability parts, has the function of selective profile control, and can improve the sweep coefficient; at the same time, the foaming agent itself is a It is a highly active surfactant, which can greatly reduce the interfacial tension of oil and water, improve the wettability of reservoir rocks, and increase the oil displacement efficiency. Therefore, foam control and flooding is a very promising technology for enhancing oil recovery. Laboratories often use simulation evaluation experimental devices to evaluate the effect of foam control and flooding, and opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 刘述忍朱礼斌赵健杨先辉徐凤兰何洋王超陈金峰李琳琳贾文义邵振鹏方正赵刚华莹
Owner BC P INC CHINA NAT PETROLEUM CORP
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