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Agent for carbon dioxide flooding and bacterial acidification corrosion inhibiting and preparation method thereof

A corrosion inhibitor, carbon dioxide technology, applied in chemical instruments and methods, botanical equipment and methods, chemicals for biological control, etc., can solve problems such as inapplicability

Active Publication Date: 2020-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention is not applicable to the corrosion caused by high temperature and high pressure carbon dioxide and the acidification induced by microorganisms such as sulfate reducing bacteria, saprophytes, iron bacteria and pseudomonas in the injection system, or oil wells treated with biotechnology in the early stage

Method used

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  • Agent for carbon dioxide flooding and bacterial acidification corrosion inhibiting and preparation method thereof
  • Agent for carbon dioxide flooding and bacterial acidification corrosion inhibiting and preparation method thereof
  • Agent for carbon dioxide flooding and bacterial acidification corrosion inhibiting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]This embodiment is used to prepare corrosion medium:

[0039] Add 1.05g of sodium bicarbonate, 0.21g of sodium sulfate, 1g of calcium chloride, 0.05g of magnesium chloride, and 10g of sodium chloride into 1000g of water, and stir to dissolve them completely to obtain CaCl 2 type oilfield simulation solution as the corrosion medium.

Embodiment 2

[0041] This example is used to prepare arecoline quaternary ammonium salt:

[0042] Add arecoline and solvent into the reactor equipped with condensing reflux at the same time, add sodium chloroacetate dropwise at 75°C, react for 6-10 hours, cool down, add solvent and stir, the product obtained after cooling is arecoline quaternary ammonium Salt. The weight ratio of arecoline, solvent and chloroacetic acid is 3:2:1.

Embodiment 3

[0044] This example is used to prepare imidazoline mixed oleic acid.

[0045] Mix oleic acid with polyethylene polyamine and hydroxyethylenediamine, the dehydrating agent is toluene, the acylation temperature is 170°C, the acylation time is 2.5 hours, the vacuum degree of the system is 4.5KPa, and the cyclization temperature is 235°C. The cyclization time was 5 hours. Adding an appropriate amount of diethylenetriamine (preferably 2% of the total weight) in the cyclization stage of synthesizing imidazoline will obviously increase the yield of imidazoline. Under suitable reaction conditions, the yield of imidazoline can reach 85%.

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PUM

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Abstract

The invention discloses an agent for carbon dioxide flooding and bacterial acidification corrosion inhibiting. The agent comprises, by weight, 1 to 35 percent of arecoline quaternary ammonium salt, 1to 20 percent of mixed oleic acid imidazoline, 5 to 15 percent of 1,3,5-tri(2-hydroxyethyl)-hexahydro-s-triazine, 5 to 10 percent of thiourea, 1 to 5 percent of monoethanolamine, 10 to 20 percent of 2-phosphonobutane-1,2,4-tricarboxylic acid and 0 to 70 percent of water. The agent prepared by the invention can be used for an oil well with high temperature, high carbon dioxide partial pressure andrich harmful microorganisms, especially in a coexistence system of various harmful bacteria, and has the advantages of small usage amount and good effect.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to an inhibitor suitable for oil wells with high temperature and high partial pressure of carbon dioxide and rich in harmful microorganisms and a preparation method thereof. Background technique [0002] In the petroleum industry, the use of carbon dioxide flooding technology is one of the important methods of enhanced oil recovery (EOR). It has been proved that with CO 2 Oil displacement technology EOR-CO 2 , can greatly increase the recoverable volume, daily output and recovery rate of the oil field. This technology has been widely used abroad and has achieved remarkable results. In this regard, the United States is at the forefront. Since the 1960s, the United States has made full use of many COs discovered in the eastern foothills of the Rocky Mountains. 2 Gas fields (reservoirs), CO2 is widely used in oil fields in nearby oil and gas basins 2 Oil flooding te...

Claims

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Application Information

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IPC IPC(8): C09K8/54C09K8/594C09K8/528A01N43/40A01N43/50A01N43/66A01N57/12A01N47/28A01N33/08A01P1/00
CPCC09K8/54C09K8/594C09K8/528A01N43/40A01N43/50A01N43/66A01N57/12A01N47/28A01N33/08C09K2208/32C23F11/10
Inventor 时维才刘宏芳吕红梅余晓玲王军磊
Owner CHINA PETROLEUM & CHEM CORP
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