Ultra-low permeability reservoir decompression and augmented injection system and preparation method

A technology for penetrating oil and systems, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor water injection effect

Inactive Publication Date: 2020-10-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem of poor normal water injection effect in ultra-low permeability reservoirs, the present invention provides an ultra-low-permeability reservoir depressurization-increasing injection system and a preparation method. When it is above 30%, the effect of reducing pressure is significant, ensuring normal water injection

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  • Ultra-low permeability reservoir decompression and augmented injection system and preparation method
  • Ultra-low permeability reservoir decompression and augmented injection system and preparation method
  • Ultra-low permeability reservoir decompression and augmented injection system and preparation method

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Embodiment 1

[0030] In order to overcome the problem of poor normal water injection effect in ultra-low permeability reservoirs, the present invention provides such Figure 1-5 Shown is an ultra-low permeability oil reservoir depressurization injection system and its preparation method, the invention can effectively reduce the ultra-low permeability oil reservoir water injection pressure, the depressurization rate is above 30%, the depressurization effect is remarkable, and the water injection is guaranteed to be normal .

[0031] A depressurization and injection enhancement system for ultra-low permeability reservoirs, the system is composed of the following by weight ratio:

[0032] Surfactant 0.10~0.20%

[0033] Anti-swelling agent 0.20~0.50%

[0034] Antiscale agent 0.05~0.10%

[0035] The rest is formation water.

[0036] Adopt surfactant among the present invention and can reduce interfacial tension, reduce capillary force, increase water phase permeability, reduce boundary layer...

Embodiment 2

[0039] Based on Example 1, in this example, preferably, the surfactant is stearylamine polyoxypropylene oxide ethylene ether propylene sulfonate, alkyl polyglucoside and petroleum sulfonate mixture.

[0040] Preferably, the stearylamine polyoxypropylene oxide ethylene ether propylene sulfonate, alkyl polyglucoside and petroleum sulfonate are in a mass ratio of 5:1:1.

[0041] In the present invention, the petroleum sulfonate is Shengli petroleum sulfonate, and the alkyl polyglucoside is a nonionic surfactant.

[0042] Preferably, the anti-swelling agent is one of dimethyl diallyl ammonium chloride, potassium chloride or ammonium chloride.

[0043] Preferably, the antiscalant is one of aminotrimethylene phosphonic acid, nitrogen-containing polyol phosphate or hydroxyethylidene diphosphonic acid.

[0044] Preferably, the salinity of the formation water is 9410 mg / L.

[0045] A method for preparing an ultra-low-permeability oil reservoir pressure-reducing injection system, the...

Embodiment 3

[0065] Based on the basis of Example 2, the ultra-low permeability reservoir depressurization injection system provided in this example is prepared from the following raw materials in weight percentage: 0.1% surfactant, 0.2% dimethyl diallyl chloride ammonium (DMDAAC), 0.05% aminotrimethylene phosphonic acid (ATMP), and the balance is formation water. Among them, the surfactant is octadecylamine polyoxypropylene oxide ethylene ether propylene sulfonate, alkyl polyglycoside (APG), petroleum sulfonate (SLPS) compounded according to the ratio of mass ratio 5:1:1 become.

[0066] The effect diagram of depressurization and injection increase in this embodiment is as follows figure 1 shown.

[0067] The lowest value of interfacial tension, anti-swelling rate, anti-scaling rate and pressure-reducing rate of the ultra-low permeability reservoir depressurization and augmentation injection system provided in this example were measured.

[0068] The measurement results are as follows:...

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Abstract

The invention provides an ultra-low permeability reservoir decompression and augmented injection system and a preparation method. The system is prepared from the following components in percentage byweight: 0.10-0.20% of a surfactant, 0.20-0.30% of an anti-swelling agent, 0.05-0.10% of an anti-scaling agent and the balance of formation water. The decompression and augmented injection system has good compatibility with formation water, and is suitable for formation water with different mineralization degrees; the oil-water interfacial tension can be effectively reduced, and the wettability ischanged; clay expansion can be obviously inhibited; scale formation can be effectively inhibited, and the scale inhibition rate is high; and the system can be stored and used for a long term.

Description

technical field [0001] The invention belongs to the technical field of petroleum natural exploitation, and in particular relates to an ultra-low-permeability oil reservoir pressure-reducing and injection-increasing system and a preparation method. Background technique [0002] my country has abundant low-permeability oil reservoir resources, accounting for about 1 / 5 of my country's total oil resources, mainly distributed in oil regions such as Changqing, Jilin and Xinjiang. It is difficult to develop low permeability reservoirs, but their development potential is huge and their status is very important. Water injection development can not only displace formation crude oil, but also maintain reservoir pressure, and provide guarantee for stable oil production. It is one of the main and effective production methods for low permeability reservoirs. Due to the complex pore structure, low reserve abundance and large fluid seepage resistance of low-permeability reservoirs, some pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/528
CPCC09K8/584C09K8/528C09K2208/12
Inventor 邓志颖姚斌姬振宁张随望陆小兵王勇唐泽玮王尔珍
Owner PETROCHINA CO LTD
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