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Acidizing corrosion inhibitor applicable to high temperature of 160 to 180 DEG C, and preparation and application thereof

An acidification corrosion inhibitor and high temperature technology, applied in chemical instruments and methods, mining fluids, wellbore/well components, etc., can solve problems such as easy coking, corrosion inhibitor damage, corrosion inhibition effect decline, etc., and achieve simple production process , good surface activity, low freezing point effect

Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high temperature has seriously damaged the corrosion inhibitor in the acidification fluid, and the corrosion inhibition effect has dropped drastically. The original corrosion inhibitor cannot meet the needs of high-temperature acidification.
At present, the commonly used anti-high temperature acidification corrosion inhibitors in China have the disadvantages of easy coking, delamination, and insufficient stability of dissolution and dispersion at high temperatures, which can not only protect oil well pipes and downhole metal equipment, but also cause formation damage.

Method used

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  • Acidizing corrosion inhibitor applicable to high temperature of 160 to 180 DEG C, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: A corrosion inhibitor suitable for high temperature acidification at 160°C, the weight percentage of component A is:

[0064] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 35%;

[0065] 3-methyl-1-pentyn-3-ol: 0.3%;

[0066] 2,4-pentanedione: 0.2%;

[0067] Cinnamaldehyde: 0.2%;

[0068] WH-9603 thickener: 3%;

[0069] Dodecyl pyridinium bromide: 10%;

[0070] Potassium fluoride: 6%;

[0071] Methanol: 45.3%.

[0072] B component weight percent is:

[0073] Antimony glycol: 20%;

[0074] Bismuth trichloride: 20%;

[0075] Cuprous oxide: 0.5%;

[0076] 1+1 hydrochloric acid: 59.5%.

[0077] The batch composition during use is the A liquid of 3 weight parts and the B liquid of 1 weight part.

[0078] The preparation method is:

[0079] A component preparation method is:

[0080]First, polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt, 3-methyl-1-pentyn-3-ol, and 2,4-pentanedione are...

Embodiment 2

[0083] Example 2: A corrosion inhibitor suitable for high temperature acidification at 160°C, the weight percentage of component A is:

[0084] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 36%;

[0085] 3-methyl-1-pentyn-3-ol: 0.4%;

[0086] 2,4-pentanedione: 0.4%;

[0087] Cinnamaldehyde: 0.3%;

[0088] WH-9603 thickener: 3.5%;

[0089] Dodecyl pyridinium bromide: 11%;

[0090] Potassium fluoride: 9%;

[0091] Methanol: 39.4%.

[0092] B component weight percent is:

[0093] Antimony glycol: 26%;

[0094] Bismuth trichloride: 19%;

[0095] Cuprous oxide: 1%;

[0096] 1+1 hydrochloric acid: 54%.

[0097] The batch composition during use is the A liquid of 3 weight parts and the B liquid of 1 weight part.

[0098] Example 2 The preparation method of a corrosion inhibitor suitable for 160°C high-temperature acidification is the same as that of Example 1.

Embodiment 3

[0099] Example 3: A corrosion inhibitor suitable for high temperature acidification at 170°C, the weight percentage of component A is:

[0100] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 37%;

[0101] 3-methyl-1-pentyn-3-ol: 0.5%;

[0102] 2,4-pentanedione: 0.6%;

[0103] Cinnamaldehyde: 0.4%;

[0104] WH-9603 thickener: 4%;

[0105] Dodecyl pyridinium bromide: 13%;

[0106] Potassium fluoride: 13%;

[0107] Methanol: 31.5%.

[0108] B component weight percent is:

[0109] Antimony glycol: 32%;

[0110] Bismuth trichloride: 17%;

[0111] Cuprous oxide: 2%;

[0112] 1+1 hydrochloric acid: 49%.

[0113] The batch composition during use is the A liquid of 2.5 weight parts and the B liquid of 1 weight part.

[0114] Example 3 The preparation method of a corrosion inhibitor suitable for 170°C high-temperature acidification is the same as that of Example 1.

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Abstract

The invention relates to an acidizing corrosion inhibitor applicable to a high temperature of 160 to 180 DEG C and preparation and application thereof. The acidizing corrosion inhibitor comprises a component A and a component B, wherein the component A is composed of polycyclic aromatic hydrocarbon methyl chloride pyridine quaternary ammonium salt, 3-methyl-1-pentyne-3-ol, 2,4-pentanedione, dodecyl pyridine bromide, cinnamaldehyde, potassium fluoride, a thickening agent WH-9603 and methanol, and the component B is composed of ethylene glycol antimony, bismuth trichloride, cuprous oxide and 1+1 hydrochloric acid; during usage, the component B and the component A are successively added into an acidizing fluid. The acidizing corrosion inhibitor is applied to construction for yield increase in a deep well with a temperature of 160 to 180 DEG C and an oil-gas well acidified by 15 to 28% concentrated hydrochloric acid or mud acid and has a low freezing point, good dispersibility in the acidizing fluid, excellent corrosion inhibition action on corrosion by concentrated hydrochloric acid and mud acid at a high temperature, a corrosion inhibition rate of no less than 99% and a corrosion rate lower than the standard of an industrial first-grade product.

Description

technical field [0001] The invention relates to a corrosion inhibitor suitable for high-temperature acidification at 160°C to 180°C and its preparation and application. Background technique [0002] With the continuous deepening of oilfield development, more wells are drilled in newly invested development blocks. During the production of oil wells, it is often necessary to increase the recovery rate through acidification. Acid injection causes corrosion of oil well tubing and downhole metal equipment, resulting in great economic losses. Therefore, in the acidizing of oil wells, especially in high-temperature deep wells and ultra-deep wells with concentrated hydrochloric acid and large acid volume, the important task is to solve the problem of corrosion protection of high-temperature acidizing fluids on oil well pipes and downhole metal equipment. In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
CPCC09K8/602C09K8/74C09K2208/32E21B43/26
Inventor 解蓓蓓韩文礼杨耀辉宋有胜张彦军张贻刚王宇宾徐忠苹
Owner BC P INC CHINA NAT PETROLEUM CORP
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