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Acidification corrosion inhibitor suitable for high temperature above 160°C

An acidizing corrosion inhibitor and high-temperature technology, which is applied to drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve problems that cannot meet the needs of deep and ultra-deep reservoir reconstruction, and achieve enhanced adsorption Density and firmness, the effect of dense protective film

Active Publication Date: 2021-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The acidizing corrosion inhibitors provided by related technologies can only be used at a well temperature of 130°C. As oil and gas exploration gradually develops into deep and ultra-deep reservoirs, the well depth exceeds 7000m, and the bottom hole temperature is generally above 160°C. The acidizing corrosion inhibitor provided can no longer meet the needs of deep and ultra-deep reservoir reconstruction

Method used

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  • Acidification corrosion inhibitor suitable for high temperature above 160°C
  • Acidification corrosion inhibitor suitable for high temperature above 160°C
  • Acidification corrosion inhibitor suitable for high temperature above 160°C

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preparation example Construction

[0067] Further, in the embodiment of the present invention, component A can be prepared by the following method: first, heat the aldehyde, ketone, and amine condensate to 40-50°C, and then mix the synergist, acetylenic alcohol, alcohol solvent and dispersant with the aldehyde, ketone The condensate is mixed evenly, and the resulting mixture is cooled to room temperature to obtain component A.

[0068] Further, the usage method of the acidification corrosion inhibitor provided by the embodiment of the present invention can be:

[0069] Step S1, adding component B to concentrated hydrochloric acid with a mass concentration above 20% to obtain a first mixture;

[0070] Step S2, adding component A to the first mixture to obtain a second mixture;

[0071] Step S3, diluting the second mixture so that the concentration of hydrochloric acid reaches a preset value to obtain an acid solution for acidification.

[0072] Here, it should be noted that the second mixture may be diluted wi...

Embodiment 1

[0077] This embodiment provides a corrosion inhibitor for acidification, which includes component A.

[0078] Wherein, A component is prepared by the following method:

[0079] Add 45 parts of aldehyde, ketone and amine condensates to the reaction kettle, and heat the aldehyde and ketone amine condensates to 40°C, then add 10 parts of 1,4-butynediol and 25 parts of formic acid to the reaction kettle in turn under stirring , 5 parts of methanol, 5 parts of ethylene glycol and 10 parts of OP-10, after being stirred evenly, component A of this embodiment is obtained, which is recorded as formula 1.

Embodiment 2

[0081] This embodiment provides a corrosion inhibitor for acidification, which includes component A.

[0082] Wherein, A component is prepared by the following method:

[0083] Add 40 parts of aldehyde, ketone and amine condensates to the reaction kettle, and heat the aldehyde and ketone amine condensates to 45°C, then add 5 parts of propynyl alcohol, 35 parts of formamide, and 5 parts of methanol to the reaction kettle in a stirring state , 5 parts of isopropanol and 10 parts of NP-10, after being stirred evenly, component A of this embodiment is obtained, which is recorded as formula 2.

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Abstract

The invention discloses an acidification corrosion inhibitor suitable for high temperature above 160 DEG C, and belongs to the technical field of oil and gas layer stimulation and transformation. The acidification corrosion inhibitor includes A component; A component includes the following components in mass percentage: aldehyde, ketone and amine condensation products: 30% to 55%; acetylenic alcohol: 3% to 10%; synergist: 15% to 40% %; alcohol solvent: 5% to 15%; dispersant: 5% to 15%; synergist selected from at least one of formic acid, acetic acid, formamide, N,N-dimethylformamide and glutaraldehyde ; Based on the mass of the aldehyde, ketone and amine condensate as 100%, the aldehyde, ketone and amine condensate includes a polymer represented by formula (I) or formula (II) with a mass ratio of more than 60%; wherein, R1 is a hydrocarbon group , X is a halogen atom, and the weight average molecular weight of the polymer is 1000 or less. The acidizing corrosion inhibitor can be applied to a high temperature above 160°C, thereby reducing the corrosion risk of downhole pipe strings in the process of acidizing deep and ultra-deep high-temperature carbonate rocks.

Description

technical field [0001] The invention relates to the technical field of oil and gas layer stimulation and transformation, in particular to an acidification corrosion inhibitor suitable for high temperatures above 160°C. Background technique [0002] Acidizing is to inject acid liquid into the formation through the wellbore, and use the chemical reaction between the acid liquid and some minerals in the formation to dissolve the connected pores or fracture wall rocks in the reservoir, increase the conductivity of pores and fractures, and achieve the purpose of increasing the production of oil and gas wells. An important measure for oil and gas well stimulation. During the acidizing process, the acid liquid will corrode the downhole pipe string, so it is necessary to add a corrosion inhibitor to the acid liquid to inhibit or slow down the corrosion of the downhole pipe string by the acid liquid. [0003] An acidification corrosion inhibitor is provided in the related art, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C09K8/74
CPCC09K8/54C09K8/74C09K2208/32
Inventor 吴文刚王道成刘友权孙川张燕
Owner PETROCHINA CO LTD
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