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A kind of nano pressure-reducing and increasing-injection oil flooding and viscosity-reducing integrated agent and its preparation method and application

A nanometer and oil displacement technology, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve the problems of insufficient injection effect and difficulty in achieving low interfacial tension, so as to eliminate clogging, reduce surface interfacial tension, Ease of use

Active Publication Date: 2022-06-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve low interfacial tension (10 -2 mN / m)
[0007] Since the existing main measures to solve the injection difficulties in low-permeability oil reservoirs are not good enough, it is urgent to develop a new technical solution to improve the injection effect, thereby improving the production efficiency of oil wells

Method used

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  • A kind of nano pressure-reducing and increasing-injection oil flooding and viscosity-reducing integrated agent and its preparation method and application

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preparation example Construction

[0032] The preparation method of the nano pressure-reducing and increasing-injection oil displacement and viscosity-reducing integrated agent of the present invention comprises the following processes:

[0033]Add oil-soluble comb polymer, triethylenetetraaminehexaacetic acid, dihexyltriaminepentamethylene phosphoric acid, cocamidopropyl sulfobetaine, xylene and dioctadecane in sequence in the reaction kettle Dimethyl ammonium chloride, nonylphenol polyoxyethylene ether TX-15 and water were stirred for 30 minutes, then monoethanolamine was added to react for 30 minutes, then methanol was added, and the nanometer pressure-reducing injection flooding and viscosity-reducing All in one.

[0034] The nano-scale pressure-reducing, increasing-injection, oil-flooding and viscosity-reducing integrated agent of the present invention is used in water injection well operations. When the nano-scale pressure-reducing, increasing-injection, oil-flooding and viscosity-reducing integrated agen...

Embodiment 1

[0036] This embodiment provides a nano-scale pressure-increasing injection flooding oil displacement and viscosity-reducing integrated agent. The raw material composition of the nano-scale pressure-increasing injection oil flooding and viscosity-reducing integrated agent includes 10% polyethylene terephthalic acid di-p-methoxy Phenyl Esters, 10% Triethylenetetraminehexaacetic Acid, 10% Dihexyltriamine Pentamethylene Phosphate, 10% Monoethanolamine, 10% Cocamidopropyl Mestaine, 25% xylene, 5% dioctadecyldimethylammonium chloride, 15% nonylphenol polyoxyethylene ether TX-15, 20% methanol, and the balance is water.

[0037] This embodiment also provides a preparation method of the above-mentioned nano-scale pressure-reducing and increasing-injection oil flooding and viscosity-reducing integrated agent, which specifically includes the following steps:

[0038] Add polyvinyl di-p-methoxyphenyl terephthalate, triethylenetetraminehexaacetic acid, dihexamethylene triamine pentamethyle...

Embodiment 2

[0056] This embodiment provides a nano-scale pressure-increasing injection flooding oil flooding and viscosity-reducing integrated agent. The raw material composition of the nano-scale pressure-increasing injection oil flooding and viscosity-reducing integrated agent includes 8% polyvinyl terephthalic acid di-p-methoxy Phenyl esters, 8% triethylenetetraminehexaacetic acid, 9% dihexyltriaminepentamethylene phosphate, 9% monoethanolamine, 9% cocamidopropyl mestaine, 23% xylene, 4% dioctadecyldimethylammonium chloride, 13% nonylphenol polyoxyethylene ether TX-15, 18% methanol, and the balance is water.

[0057] The performance of the above-mentioned integrated agent of this embodiment was tested indoors. Its quality technical indicators are as follows:

[0058] Appearance: Colorless transparent liquid at room temperature;

[0059] pH value: 7.1;

[0060] Anti-expansion rate 65%;

[0061] Shrinkage rate 33%;

[0062] Calcium sulfate scale inhibition rate is 93%;

[0063] The...

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Abstract

The invention provides a nano-scale pressure-reducing, injection-flooding, oil displacement and viscosity-reducing integrated agent and its preparation method and application. The raw material composition of the integrated agent includes: 5.0%-10.0% oil-soluble comb polymer, 5.0%-10.0% Triethylenetetraminehexaacetic acid, 8.0%‑10.0% dihexyltriaminepentamethylene phosphate, 8.0%‑10.0% monoethanolamine, 5.0%‑10.0% cocamidopropyl mesylate beet Alkali, 20.0%‑25.0% xylene, 3.0%‑5.0% dioctadecyldimethylammonium chloride, 10.0%‑15.0% nonylphenol ethoxylate TX‑15, 15.0%‑20.0 % of methanol and the balance of water. The present invention also provides a preparation method of the above-mentioned integrated agent. The nano-scale pressure-reducing, increasing-injection, oil-flooding and viscosity-reducing integrated agent of the present invention is used as an additive for water injection wells, and the dosage is 0.1%-0.3%, which can effectively reduce the oil-water interfacial tension to 10 ‑3 At mN / m level, it can effectively eliminate formation clogging caused by barium, strontium sulfate and organic scale in the formation, and at the same time, it can effectively reduce the viscosity and freezing point of crude oil by more than 60%, and effectively improve the production efficiency of oil wells.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to a nanometer pressure-reducing, increasing-injection, oil-flooding and viscosity-reducing integrated agent, a preparation method and application thereof. Background technique [0002] Low-permeability oil fields have the characteristics of low permeability, small porosity, and low water absorption capacity of the reservoir. In addition, factors such as clay minerals in the oil layer swell with water and the water quality of the injected water are not compatible with the oil layer cause damage to the oil layer, resulting in continuous rise in water injection pressure. A high pressure zone forms near the injection well. At the same time, long-term high-pressure water injection can easily lead to casing damage, and under-injection of water wells can easily lead to stress-sensitivity effects in the reservoir, which seriously restricts the water injection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58E21B43/22
CPCC09K8/58E21B43/16
Inventor 王勇慕立俊姚斌姬振宁张随望陆小兵宋昭杰隋蕾邓志颖王尔珍
Owner PETROCHINA CO LTD
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