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Acidizing corrosion inhibitor applicable to high temperature of 140 to 160 DEG C, and preparation and application thereof

A technology of acidizing corrosion inhibitor and high temperature, applied in chemical instruments and methods, production fluids, wellbore/well components, etc., can solve the problems of easy coking, corrosion inhibitor damage, decline in corrosion inhibition effect, etc., and achieve a 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 140 to 160 DEG C, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: A corrosion inhibitor suitable for high temperature acidification at 140°C, the weight percentage of component A is:

[0062] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 30%;

[0063] 3-methyl-1-pentyn-3-ol: 0.6%;

[0064] Glyoxal: 0.1%;

[0065] Dimethylformamide: 2%;

[0066] Hydroxyethylcellulose: 0.5%;

[0067] Emulsifier OPE-20: 15%;

[0068] Methanol; 51.8%.

[0069] B component weight percent is:

[0070] Potassium antimony tartrate: 15%;

[0071] Bismuth oxide: 15%;

[0072] Vitamin C: 10%;

[0073] 1+1 hydrochloric acid: 60%.

[0074] The batch composition during use is the A liquid of 3 weight parts and the B liquid of 1 weight part.

[0075] The preparation method is:

[0076] The preparation method of A component is:

[0077]Add 50% methanol in proportion to the enamel reaction kettle, slowly raise the temperature to 55-60°C, add hydroxyethyl cellulose under constant stirring, stir until all hydrox...

Embodiment 2

[0080] Example 2: A corrosion inhibitor suitable for high temperature acidification at 140°C, the weight percentage of component A is:

[0081] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 31%;

[0082] 3-methyl-1-pentyn-3-ol: 0.5%;

[0083] Glyoxal: 0.15%;

[0084] Dimethylformamide: 3%;

[0085] Hydroxyethylcellulose: 1%;

[0086] Emulsifier OPE-20: 15.5%;

[0087] Methanol; 48.85%.

[0088] B component weight percent is:

[0089] Potassium antimony tartrate: 16%;

[0090] Bismuth oxide: 14%;

[0091] Vitamin C: 11%;

[0092] 1+1 hydrochloric acid: 59%.

[0093] The batch composition during use is the A liquid of 3 weight parts and the B liquid of 1 weight part.

[0094] Example 2 The preparation method of a corrosion inhibitor suitable for 140°C high-temperature acidification is the same as that of Example 1.

Embodiment 3

[0095] Example 3: A corrosion inhibitor suitable for high temperature acidification at 150°C, the weight percentage of component A is:

[0096] Polycyclic aromatic hydrocarbon chloromethyl pyridinium quaternary ammonium salt: 33%;

[0097] 3-methyl-1-pentyn-3-ol: 0.4%;

[0098] Glyoxal: 0.2%;

[0099] Dimethylformamide: 4%;

[0100] Hydroxyethylcellulose: 1.5%;

[0101] Emulsifier OPE-20: 16%;

[0102] Methanol; 44.9%.

[0103] B component weight percent is:

[0104] Potassium antimony tartrate: 17%;

[0105] Bismuth oxide: 13%;

[0106] Vitamin C: 13%;

[0107] 1+1 hydrochloric acid: 57%.

[0108] The batch composition during use is the A liquid of 2.5 weight parts and the B liquid of 1 weight part.

[0109] Example 3 The preparation method of a corrosion inhibitor suitable for 150°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 140 to 160 DEG C and a preparation method 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, glyoxal, dimethyl formamide, hydroxyethyl cellulose, an emulsifier OPE-20 and methanol, and the component B is composed of antimony potassium tartrate, bismuth oxide, vitamin C 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 140 to 160 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 140°C to 160°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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IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/604C09K8/725C09K8/74C09K2208/32E21B43/26
Inventor 解蓓蓓韩文礼张贻刚宋有胜张彦军杨耀辉郝志伟徐忠苹
Owner BC P INC CHINA NAT PETROLEUM CORP
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