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A kind of anti-corrosion foaming agent for natural gas well and preparation method thereof

A foaming agent and natural gas technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of shortening the service life of oil casing, corrosion of oil casing, and the influence of foaming performance of foaming agent, etc., to achieve excellent The effect of corrosion inhibition

Active Publication Date: 2016-11-30
SUINING HUANING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the produced high-salinity formation water, hydrogen sulfide, and 2 S-CO 2 -Cl - The medium environment will greatly corrode the oil casing and shorten the service life of the oil casing
[0003] At present, in the production process of domestic water gas reservoirs, most of them adopt foam drainage gas recovery and injection of corrosion inhibitor anticorrosion technology. The aromatic hydrocarbon solvent in the foaming agent has defoaming effect, which has a serious impact on the foaming performance of the foaming agent and reduces the foaming and liquid-carrying ability of the foaming agent; (2) The aromatic hydrocarbons in the foaming agent and corrosion inhibitor Oil-water emulsification occurs between lipophilic solvents and formation produced water, which may cause the emulsified product to block the tubing

Method used

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  • A kind of anti-corrosion foaming agent for natural gas well and preparation method thereof
  • A kind of anti-corrosion foaming agent for natural gas well and preparation method thereof
  • A kind of anti-corrosion foaming agent for natural gas well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] R1 in the chemical structural formula of imidazoline is a normal alkyl group containing 12 carbon atoms, R2 is a methyl group, and R3 is an ethyl group; in the chemical structural formula of ethylene dialkylammonium halide, R is a normal alkyl group containing 16 carbon atoms Base, X is CL.

[0037] Add 150kg of imidazoline surfactant and 75kg of ethylenedialkylammonium halide into a stainless steel reaction kettle, heat to about 85°C, keep warm until completely dissolved, and stir at 60r / min for 10min; then add 275kg of soft water, Stir at 50r / min for 30min to 35min.

[0038] The corrosion-inhibiting foaming agent in Example 1 was tested under conditions comparable to the natural gas well environment, and the foaming height, liquid carrying capacity and corrosion inhibition rate were measured. During the experiment, the dosage of corrosion inhibitor and foaming agent was 3g / L, that is, 3g of corrosion inhibitor and foaming agent was used per liter of mineralized water...

Embodiment 2

[0040] R1 in the chemical structural formula of imidazoline is a normal alkyl group containing 13 carbon atoms, R2 is an ethyl group, and R3 is an ethyl group; in the chemical structural formula of ethylene dialkylammonium halide, R is a normal alkyl group containing 17 carbon atoms Base, X is CL.

[0041] Add 165kg of imidazoline surfactant and 100kg of ethylenedialkylammonium halide into a stainless steel reaction kettle, heat it to about 85°C, keep it warm until it is completely dissolved, and stir at 60r / min for 115min; then add 235kg of soft water, Stir at 50r / min for 30min to 35min.

[0042] The corrosion inhibitor foaming agent in Example 2 was tested under the same conditions as in Example 1, and the evaluation conditions and results are shown in Table 1.

Embodiment 3

[0044] R1 in the chemical structural formula of imidazoline is a normal alkyl group containing 14 carbon atoms, R2 is a methyl group, and R3 is a propyl group; in the chemical structural formula of ethylene dialkylammonium halide, R is a normal alkyl group containing 18 carbon atoms Base, X is Br.

[0045] Add 175kg of imidazoline surfactant and 125kg of ethylene dialkylammonium halide into the stainless steel reaction kettle, heat to about 85°C, keep warm until completely dissolved, stir at 60r / min for 10min~15min; then add 200kg of soft water , stirring at 50r / min for 30min to 35min.

[0046] The corrosion inhibitor foaming agent in Example 3 was tested under the same experimental conditions as Example 1, and the evaluation conditions and results are shown in Table 1.

[0047] Table 1: Evaluation conditions and results of corrosion inhibitor foaming agents

[0048]

[0049]

[0050] In summary, the corrosion inhibitor and foaming agent for natural gas wells provided ...

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Abstract

The invention discloses a corrosion-inhibiting foaming agent for natural gas wells and a preparation method thereof. The corrosion-inhibiting foaming agent comprises 30% to 35% of imidazoline, 15% to 25% of ethylene dialkyl ammonium halide, The balance is polar solvent. The preparation method of the corrosion inhibitor and foaming agent comprises step 1: adding 30%~35% of imidazoline and 15%~25% of ethylene dialkyl ammonium halide into a stainless steel reaction kettle, heating to 80°C~85 ℃, keep warm until completely dissolved, and then stir for 10min-15min; step 2, add the remaining amount of polar solvent into the stainless steel reaction kettle in step 1, and stir for 30min-35min. The corrosion-inhibiting and foaming agent of the present invention is an agent with dual functions of corrosion inhibition and foaming. It overcomes the influence of the oil-soluble defoaming component in the corrosion inhibitor on the foaming performance of the foaming agent, and effectively solves the problem of oil-water emulsification between the foaming agent and the lipophilic solvent in the corrosion inhibitor and the formation produced water. Blockage of oil pipe by emulsion. Excellent corrosion inhibition effect and foaming effect.

Description

technical field [0001] The invention relates to the technical field of natural gas well exploitation, in particular to a corrosion inhibitor foaming agent for natural gas wells and a preparation method thereof. technical background [0002] In the process of mining gas reservoirs with water, with the production of natural gas, formation water with high salinity containing various ions continuously enters the wellbore along with the natural gas. If the gas has enough energy, it can bring the liquid entering the wellbore to the surface , no effusion at the bottom of the well. In the middle and late stages of gas exploitation, formation water production is becoming more and more serious, and the formation energy is also seriously insufficient (gas production is reduced), and the gas cannot completely bring the produced water to the ground. If it is not discharged in time, the gas well will be flooded due to the deposition in the downhole, which will deteriorate the permeabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
Inventor 向伟
Owner SUINING HUANING CHEM
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