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A CO2 flooding corrosion and scale inhibitor suitable for high salinity and high barium and strontium environment

A corrosion and scale inhibitor, high salinity technology, applied in drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve problems such as hidden dangers of wellbore corrosion and scaling, and achieve improved displacement effect, good anti-corrosion and anti-scaling effect, and the effect of enhancing oil recovery

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a CO 2 Corrosion and scale inhibitors for wellbore flooding, to solve the problem of implementing CO in the dual environment of corrosion and scaling 2 Hidden dangers of wellbore corrosion and scaling in the flooding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This is still to provide a CO suitable for high salinity, high barium and strontium environment 2 Corrosion and scale inhibitors are composed of the following substances by weight percentage:

[0041] Modified oxazoline derivatives: 10-22%;

[0042] Diacetylenic oxymethylamine quaternary ammonium salt: 10-20%;

[0043] Sodium diethylenetriaminepentamethylene phosphonate: 5-10%;

[0044] Isomerized decanol polyoxyethylene ether: 1 to 5%;

[0045] Isopropanol: 4-10%;

[0046] The rest is water.

[0047] Further, it consists of the following substances by weight percentage:

[0048] Modified oxazoline derivatives: 13-19%;

[0049] Diacetylenic oxymethylamine quaternary ammonium salt: 12-17%;

[0050] Sodium diethylenetriaminepentamethylene phosphonate: 7-8%;

[0051] Isomerized decanol polyoxyethylene ether: 2 to 4%;

[0052] Isopropanol: 6-8%;

[0053] The rest is water.

[0054] Optimally proportioned, it consists of the following substances by weight percenta...

Embodiment 2

[0066] This embodiment provides a kind of CO suitable for high salinity, high barium strontium environment 2 The preparation method of the anti-corrosion and anti-scaling agent of flooding, comprises the following steps:

[0067] 100 parts of materials are formed by the following substances in percentage by weight:

[0068] Modified oxazoline derivatives: 10-22%; Diacetylenyloxymethylamine quaternary ammonium salt: 10-20%; Sodium diethylene triamine pentamethylene phosphonate: 5-10%; Isomerized decanol polyoxyethylene Ether: 1~5%; Isopropanol: 4~10%; the rest is water;

[0069] First, stir the isomeric decanol polyoxyethylene ether with isopropanol until it is completely dissolved. Secondly, under constant stirring, first add 10% of the water that needs to be added and continue stirring for 30 minutes, and then add the modified imidazoline derivative, two Alkyneoxymethylamine quaternary ammonium salt and sodium diethylenetriaminepentamethylene phosphonate were added while st...

Embodiment 3

[0074] A CO2 flooding corrosion and scale inhibitor suitable for high salinity and high barium and strontium environments according to the present invention consists of the following substances by weight percentage:

[0075] Modified imidazoline derivatives: 16%;

[0076] Diacetylenic oxymethylamine quaternary ammonium salt: 15%;

[0077] Sodium diethylenetriaminepentamethylene phosphonate: 7.5%;

[0078] Isomerized decanol polyoxyethylene ether: 3%;

[0079] Isopropanol: 7%;

[0080] Water: 51.5%.

[0081] According to the proportion, under normal temperature and pressure, in a reaction kettle with a capacity of 10L, first stir the modified imidazoline derivative and isomeric decanol polyoxyethylene ether with isopropanol until completely dissolved, and secondly, under constant stirring, first Add 10% of the water that needs to be added and continue stirring for 30 minutes, then add diacetylenyloxymethylamine quaternary ammonium salt and sodium diethylenetriamine pentamet...

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Abstract

The invention relates to a CO2-driving corrosion and scale inhibitor suitable for a high-mineralization-degree and high-barium-strontium environment. The CO2-driving corrosion and scale inhibitor is composed of a modified oxazoline derivative, diyne oxygen methyl amine quaternary ammonium salt, sodium pentamethylenephosphonate diethylenetriamine, isodecanol polyoxyethylene ether, isopropyl alcohol and water. An absorption membrane formed by the corrosion and scale inhibitor effectively isolates a corrosive medium, and a good protection function on a tubular column is achieved; meanwhile, effective scale inhibiting ingredients and Ba2<+> / Sr2<+> ions form a chelate high in stability, and scaling is prevented; nonionic ingredients contained in a formula change oleophylic wettability of the rock core, and the displacement result of CO2-driving on remaining oil is improved. The CO2-driving corrosion and scale inhibitor has the advantages that the chemical adding process is simple and convenient, less dosage is needed, and practicability is high; it is verified by experiments that a good corrosion-resistant and scaling-resistant effect is achieved on a CO2-driving shaft in the high-mineralization-degree and high-barium-strontium environment of a west oil field, the problem of hidden danger of corrosion and scaling of the shaft existing in the CO2-driving implementation process in a dual environment of corrosion and scaling is solved, and a technical guarantee is provided for raising the yield of CO2-driving.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a CO 2 Corrosion and scale inhibitors. Background technique [0002] For the development of some low-permeability and ultra-low-permeability reservoirs, CO 2 Oil flooding technology is an effective method to further enhance oil recovery in water flooding reservoirs. CO 2 Oil flooding technology is widely used in the United States, Canada, Japan, Angola, Turkey and other countries and regions, among which the United States is the first country in the world to implement CO 2 -EOR country, also CO 2 The country with the fastest development of oil displacement, 2012 US CO 2 112 miscible flooding projects, annual injection of CO 2 38.4 billion cubic meters, with an annual oil output of 16.089 million tons, and achieved good results. [0003] Domestic CO 2 The oil flooding technology started relatively late with a small scale. It started in 1997, and it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C09K8/528C09K8/594
CPCC09K8/528C09K8/54C09K8/594C09K2208/32
Inventor 刘宁周志平何治武周佩何淼董俊姜毅唐泽玮苑慧莹程碧海杨会丽
Owner PETROCHINA CO LTD
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