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Corrosion inhibitor for clean diverting acid, and preparation method thereof

A technology that turns to acid and corrosion inhibitors, applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., can solve serious problems such as not being able to maintain viscosity, and achieve good stability, no viscosity reduction, and anti-corrosion excellent effect

Active Publication Date: 2019-01-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the corrosion of carbon steel by clean fracturing acid system is much more severe than that of ordinary acid system, and most corrosion inhibitors have gel breaking ability for clean fracturing acid system, so that the system cannot maintain a certain viscosity at the bottom of the well

Method used

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  • Corrosion inhibitor for clean diverting acid, and preparation method thereof
  • Corrosion inhibitor for clean diverting acid, and preparation method thereof
  • Corrosion inhibitor for clean diverting acid, and preparation method thereof

Examples

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Effect test

preparation example Construction

[0036] The preparation method of above-mentioned cleaning steer acid corrosion inhibitor is:

[0037] First prepare the heterocyclic amine quaternary ammonium salt: the heterocyclic amine quaternary ammonium salt is prepared by the following process: under the pressure of 0.3-0.5Mpa, add the heterocyclic amine and benzyl chloride into the container at a molar ratio of 1-1.2:1, Then add isopropanol, then heat up to 120-130°C, keep warm for 4-6h to obtain quaternary ammonium salt of heterocyclic amine, wherein isopropanol accounts for 80% of the total mass of heterocyclic amine and benzyl chloride, the reaction formula is as follows ;

[0038]

[0039] The heterocyclic amine is a quinoline compound, a pyridine compound or a morpholine compound. Among them, the quinoline compound is quinoline or isoquinoline; the pyridine compound is pyridine, 2-picoline (α-picoline), 3-picoline (β-picoline) or 4-methylpyridine Pyridine (γ-picoline); morpholine compounds are N-methylmorpholi...

Embodiment 1

[0044] In this example, the preparation of the corrosion inhibitor for cleaning fracturing acid is divided into two steps: the first step is the synthesis of quinoline quaternary ammonium salt as the main agent, and the second step is the preparation of the corrosion inhibitor.

[0045] Under the pressure of 0.3-0.5Mpa, add quinoline and benzyl chloride into a three-necked flask at a molar ratio of 1:1, then add isopropanol (accounting for 80% of the total mass of quinoline and benzyl chloride) and mix evenly to heat up , turn on the cooling circulation system, ensure that the heating rate is not higher than 20°C / 10min, raise the temperature from room temperature to 120-130°C, and keep the temperature for 6 hours to obtain quinoline quaternary ammonium salt;

[0046]Then according to mass percentage, quinoline quaternary ammonium salt 20%, n-hexanoic acid 10%, butynediol 5%, ricinoleic acid polyoxyethylene ether 3%, water 22% and isopropanol 40% are mixed uniformly, obtain Cor...

Embodiment 2

[0054] Under the pressure of 0.3-0.5Mpa, add isoquinoline and benzyl chloride into the three-necked flask at a molar ratio of 1.2:1, then add isopropanol (accounting for 80% of the total mass of isoquinoline and benzyl chloride) and mix well Heating to raise the temperature, turn on the cooling circulation system, ensure that the heating rate is not higher than 20°C / 10min, raise the temperature to 120-130°C, and keep it warm for 6 hours to obtain quinoline quaternary ammonium salt;

[0055] Then, according to mass percentage, 25% of quinoline quaternary ammonium salt, 10% of lauric acid, 3% of butynediol, 5% of polyoxyethylene laurate, 20% of water and 37% of isopropanol were mixed uniformly to obtain a clean Corrosion inhibitor for steering acid, code TG204-2;

[0056] According to the test method and conditions in Example 1, the test was carried out. The results show that the corrosion rate of TG204-2 corrosion inhibitor in clean diverting acid is 21g / m 2 ·h, meet the firs...

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Abstract

The invention discloses a corrosion inhibitor for a clean diverting acid, and a preparation method thereof. The preparation method comprises the following steps: adding heterocyclic amine and benzyl chloride into a container under a pressure of 0.3-0.5 MPa according to a molar ratio of (1-1.2):1, adding isopropanol, heating the container to 120-130 DEG C, and carrying out a heat-insulation reaction for 4-6 h to obtain a quaternary ammonium salt of the heterocyclic amine; and uniformly mixing, by mass, 10-15% of saturated fatty acid, 3-5% of butynediol, 3-5% of a surfactant, 45-64% of a solventand 20-30% of the above main agent to obtain the corrosion inhibitor for the clean diverting acid. The corrosion inhibitor for the clean diverting acid has an excellent protection effect on carbon steel oil tubes and devices in a clean diverting acid environment, and does not reduce the viscosity of the acid solution system. The product solves the corrosion problem of the clean diverting acid system during the acidification fracturing operation, achieves the purpose of oil tube protection, and meets industry standards.

Description

technical field [0001] The invention belongs to the protection of oil and gas well pipelines and equipment in the petroleum and petrochemical field, and in particular relates to a corrosion inhibitor for cleaning diverting acid and a preparation method thereof. Background technique [0002] The characteristics (difficulties) of carbonate reservoir stimulation are mainly as follows: 1) Comprehensive operations such as drilling, well completion, and well cementing have seriously damaged the production layer; 2) Clay minerals are ubiquitous, and clay swelling, migration, and sedimentation blockage pore throats, which lead to a decrease in reservoir permeability; 3) acid-sensitive minerals cause secondary damage to the reservoir; 4) the existence of natural fractures, which will change the flow direction of acid liquid and the location of fracture creation; 5) medium pores-thin throats 6) The heterogeneity of the reservoir is serious, and the acidification is not uniform, result...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/54C07D215/10C07D217/10C07D213/127C07D213/20C07D295/023C07D295/037
CPCC09K8/54C09K8/725C09K8/74C07D213/127C07D213/20C07D215/10C07D217/10C07D295/023C07D295/037C09K2208/32
Inventor 张娟涛宋文文尹成先李循迹杨春林付安庆李彬李有伟艾克热木
Owner BC P INC CHINA NAT PETROLEUM CORP
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