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Weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof

A technology of surfactant and ternary compounding, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the difficulty of interfacial tension between a single surfactant and crude oil, and affect the injection process and injection of the composite system Time rate, fouling at the injection end, etc., to achieve the effect of solving the lifting system problem, low possibility, and reduced processing difficulty

Active Publication Date: 2013-07-31
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The research on the existing weak base three-component compound system is still in the preliminary stage, and most of the surfactants used in it are single surfactants. effect, the oil-water equilibrium interfacial tension must reach 10 -3 Ultra-low value on the order of mN / m, but it is very difficult and expensive to achieve this order of magnitude of interfacial tension between a single surfactant and crude oil
In addition, in the existing weak base ternary composite system, although the weak base is not as serious as the strong base at the production end, the fouling at the injection end is serious, which seriously affects the injection process and injection time rate of the composite system.

Method used

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  • Weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof
  • Weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof
  • Weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Carry out the experiment of this embodiment according to the following operations:

[0049] 1 Measure the interfacial tension of the uniform composite system prepared on the same day. The prepared composite system must be capable of ultra-low interfacial tension on the order of 10-3mN / m with crude oil, and the measured interfacial tension is taken as the 1-day interfacial tension of the system.

[0050] 2 Put the compound system prepared into the colorimetric tube. During the filling process, the colorimetric tube should be filled as much as possible to reduce the residual air in the colorimetric tube, and the colorimetric tube should be sealed.

[0051] 3 Put the sealed colorimetric tube in a constant temperature box at 45°C. After 90 days, the interfacial tension between the composite system and crude oil was measured as the 90-day interfacial tension of the system.

[0052] Figure 14 , Figure 15 It shows the stability and activity of the compound surfactant oi...

Embodiment 2

[0054] In this example, the emulsification performance of the oil displacement system of the present invention is investigated through an emulsification experiment. Specific emulsification experiment:

[0055] 1 Determine the concentration point of the composite system (active agent, alkali) used in the emulsification experiment according to the interfacial tension performance of the composite system.

[0056] 2 According to the oil-water volume ratio of 1:1, add a certain volume of V0 composite system and crude oil into the stoppered measuring cylinder, and place it in a 45°C constant temperature box, and let it stand for 1 hour.

[0057] 3 Use a homogenizer to stir at 11000rpm for 1min, stir the composite system and crude oil evenly, then place it in a constant temperature box at 45°C, observe and record the volume change of the water phase until the volume of the water phase no longer changes, Record the final aqueous phase volume V1, and record the experimental phenomena ...

Embodiment 3

[0062] The core flooding experiment was carried out for the compound surfactant system of sodium carbonate + salt, and the specific experimental scheme is as follows:

[0063] 1. Water flooding, the water content reaches more than 98%;

[0064] 2. The front polymer slug is 0.1PV, P: 1600mg / L, and the dirt is mixed with the dirt;

[0065] 3. Ternary system of ternary compound surfactant 0.3PV (see the table below for the formula);

[0066] 4. The follow-up polymer protection slug is 0.2PV, P: 1600mg / L, and the dirt is mixed with the dirt;

[0067] 5. Subsequent water flooding, the water content reaches more than 98%.

[0068] Surfactant ratio is S 石 :S 重 = 3:1 sodium carbonate + sodium chloride compound system flooding experimental data

[0069]

[0070] It can be seen that the three-component composite oil flooding composition of the present invention drives oil, and each component interacts and contributes synergistically, and finally keeps the performance of the syst...

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Abstract

The invention provides a weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof, and the ternary composite reservoir oil displacement composition contains a formulated surfactant, which is formulated by mahogany petroleum sulfonate and HABS according to 3:1 weight ratio; 0.4 wt.% and 0.6 wt.% of sodium carbonate; polymer. The ternary composite reservoir oil displacement composition provided by the invention has synergism between each ingredient, and can the recovery efficiency is increased by more than 20%; simultaneously because the reservoir oil displacement composition of the present invention does not have highly basic sodium hydroxide, and the sodium carbonate concentration in the prior art weak base ternary system is reduced, and the possibility for dissolving rock in stratum is reduced, thereby solving the lifting system problem caused by scaling in the extraction well and reducing treatment difficulty of the ground system.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a weak base triple compound oil flooding composition which does not contain a strong base compound surfactant and its application, especially its application in tertiary oil recovery. Background technique [0002] In the field of tertiary oil recovery technology, the recovery rate of alkali / surfactant / polymer (ASP) ASP flooding can be increased by more than 20% on the basis of water flooding, and it has a good effect of increasing oil and reducing water. [0003] The traditional ASP flooding technology uses a strong base ASP flooding composition system, in which the strong base (NaOH) can react with the active components in crude oil to form a natural surfactant, which has a synergistic effect with the external surfactant , greatly reducing the oil-water interfacial tension and reducing the adsorption amount of surfactants, reducing the cost of composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 李国桥赵劲毅黄文庆纪海龙陶永罡郝金生闵洁李佰广
Owner PETROCHINA CO LTD
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