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Composition for alkali-free chemical complex oil displacement and application thereof in tertiary oil recovery

A composite flooding and composition technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of high production cost, poor solubility, high Krafft point, etc., and achieve good long-term stability

Active Publication Date: 2013-05-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the difficulties in alkali-free binary compound flooding technology is the development of high-efficiency surfactants: under alkali-free conditions, it can achieve ultra-low interfacial tension with crude oil (10 -3 The index of mN / m order of magnitude and below) puts forward very high requirements on the active agent, and the traditional heavy alkylbenzene sulfonate and petroleum sulfonate products cannot meet the needs
Betaine amphoteric surfactants represented by aryl alkyl hydroxypropyl sultaine and erucamide propyl hydroxypropyl sultaine are two kinds of alkali-free binary compound surfactants with better performance that have emerged in recent years. Surfactants used for flooding have the advantages of good interface performance, qualified adsorption, temperature resistance and salt resistance, and high oil displacement efficiency; however, the production costs of these two betaines are relatively high, which is greatly limited in field application
In addition, long-chain hydroxypropyl sulfobetaine has a high Krafft point and poor solubility in the produced water of oil reservoirs with medium and low salinity (below 8000mg / L) in Daqing and Xinjiang, which affects the actual use on site

Method used

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  • Composition for alkali-free chemical complex oil displacement and application thereof in tertiary oil recovery
  • Composition for alkali-free chemical complex oil displacement and application thereof in tertiary oil recovery
  • Composition for alkali-free chemical complex oil displacement and application thereof in tertiary oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Reservoir 1 block 1 oil-water interfacial tension test

[0053] Use the produced water (formation water) of block 1 of the oil reservoir to prepare the composition for non-alkali chemical flooding with the mass concentration of composite surfactant being 0.05%, 0.10% and 0.20%, and the mass percentage concentration of polymer HPAM being 0.09%. , to measure the interfacial tension between it and the crude oil in block 1 of reservoir 1. Among them, the composite surfactant is erucamide propyl carboxybetaine (V2) and betaine (T2Y), and the weight ratio of the two is 20:80 and 40:60. The test results are shown in Table 1 and figure 1 shown.

[0054] Table 1 Oil-water interfacial tension table of the composition for alkali-free chemical flooding in reservoir 1 block 1 condition (HPAM0.09%)

[0055]

Embodiment 2

[0057] Reservoir 1 block 2 oil-water interfacial tension test

[0058] The produced water (formation water) of block 2 of reservoir 1 was used to prepare composite surfactants with mass percentage concentrations of 0.05%, 0.10%, 0.20%, and 0.30% respectively, and hydrophobic association polymers with mass percentage concentrations of 0.25% without The composition for alkali chemical flooding was used to measure the dynamic interfacial tension between it and the crude oil in block 1 of the reservoir. Wherein, the composite surfactant adopts erucamide propyl carboxy betaine (V2) and docosyl hydroxypropyl sulfobetaine (T2Y), and the weight ratio of the two is 70:30. The test results are shown in Table 2 and figure 2 shown.

[0059] Table 2 The oil-water interfacial tension table of the composition for alkali-free chemical flooding in block 2 of reservoir 1 (polymer 0.25%)

[0060]

Embodiment 3

[0062] Interfacial Tension Test of Composite Surfactants with Different Compounding Ratio in Reservoir 1 Block 3 Conditions

[0063] The produced water (i.e., the formation water) of block 3 of the reservoir 1 was used to prepare solutions with a mass percent concentration of 0.10% of the composite surfactant, wherein the composite surfactant was erucamide propyl carboxybetaine (V2) and two Dodecyl hydroxypropyl sulfobetaine (T2Y), the weight ratio of the two is 90:10, 80:20, 70:30 respectively, and the interfacial tension between the above-mentioned various solutions and the crude oil in block 3 of reservoir 1 is measured . Test results such as image 3 shown.

[0064] Depend on image 3 It can be seen that when the compounding ratios of erucamidopropylcarboxybetaine (V2): docosyl hydroxypropyl sulfobetaine (T2Y) are 90:10, 80:20, and 70:30, the ultra-low The time corresponding to the interfacial tension is 45min, 37min and 30min, that is, with the increase of the content...

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Abstract

The invention relates to a composition for alkali-free chemical complex oil displacement and an application thereof in tertiary oil recovery. The composition for alkali-free chemical complex oil displacement comprises the following components in percentage by weight: 0.03-0.30% of composite surfactant, 0.05-0.30% of polymer and the balance of water, wherein the composite surfactant comprises fatty acid amide propyl carboxybetaine and alkyl sulphobetaine at a weight ratio of (5-95): (95-5). The invention further relates to the application of the composition for alkali-free chemical complex oil displacement in tertiary oil recovery of an oil deposit. The interface performance of the composition for alkali-free chemical complex oil displacement, provided by the invention, exceeds that of the single fatty acid amide propyl carboxybetaine and the single alkyl sulphobetaine; and the composition can enable crude oil in middle and low-temperature and middle and low-salinity oil deposits and high-temperature and high-salinity oil deposits to achieve the stable ultralow interfacial tension; and furthermore, the composition has good long-term stability at the different temperatures of the oil deposits.

Description

technical field [0001] The invention relates to an alkali-free chemical composite flooding composition for tertiary oil recovery, in particular to an alkali-free chemical composite flooding composition and its application in tertiary oil recovery, belonging to the technical field of oil exploitation. Background technique [0002] With the continuous development of oilfields, China's main onshore oilfields have entered a stage of high recovery and high water cut. While the output of crude oil is decreasing, the demand for crude oil is increasing day by day due to domestic economic development. Stabilizing and increasing production in mature oilfields has become an important issue for oilfield development workers. [0003] The results of CNPC's second tertiary oil recovery potential evaluation show that chemical flooding is the main enhanced oil recovery technology adapting to the reservoir conditions in my country. The development, popularization and application of enhanced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
Inventor 蔡红岩王红庄马德胜王强
Owner PETROCHINA CO LTD
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