Salt tolerant corrosion and scale inhibitor for underground oil-gas wells and preparation method thereof

A corrosion and scale inhibitor, technology for oil and gas wells, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling, etc. It can achieve the effect of remarkable scale inhibition effect, firm adsorption film layer and strong salt resistance performance.

Active Publication Date: 2015-05-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for oil and gas wells, H 2 S, CO 2 Acid gas, as well as a variety of complex corrosion and scaling substances, often cannot achieve satisfactory anti-corrosion and anti-scaling effects
[0006] On-site use of a single agent for oil well corrosion and scaling protection can neither solve the problem of coexistence of on-site corrosion and scaling, but also increase production costs and workload, and there are potential problems of incompatibility between agents
The anti-corrosion and scale inhibitor

Method used

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  • Salt tolerant corrosion and scale inhibitor for underground oil-gas wells and preparation method thereof
  • Salt tolerant corrosion and scale inhibitor for underground oil-gas wells and preparation method thereof
  • Salt tolerant corrosion and scale inhibitor for underground oil-gas wells and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] For oil well salt-resistant corrosion and scale inhibitors, the weight ratio of each component is:

[0036] Imidazoline derivatives: 40%;

[0037] Thiourea: 2%;

[0038] Hexamethylenetetramine: 2%;

[0039] Cetylpyridinium chloride: 3.5%;

[0040] Aminotrimethylenephosphonic acid (ATMP): 1.5%;

[0041] Hydroxyethylenediphosphonic acid (HEDPA): 1.5%;

[0042] Dodecyl dimethyl benzyl ammonium chloride (1227): 20%;

[0043] Methanol: 5%;

[0044] Water: 24.5%.

[0045]Preparation of imidazoline derivatives: first add 1440Kg of raw material oleic acid and 560Kg of polyethylene polyamine into the enamel reaction kettle, control the temperature at 100-110°C, stir well to make the mixture even, then slowly raise the temperature to 150°C, and react under vacuum for 1h . Add water-carrying agent xylene 100Kg to carry out acylation reaction for 2 hours, then slowly raise the temperature to 220°C to carry out cyclization reaction, and obtain an imidazoline intermediate aft...

Embodiment 2

[0054] For oil well salt-resistant corrosion and scale inhibitors, the weight ratio of each component is:

[0055] Imidazoline derivatives: 30%;

[0056] Thiourea: 2%;

[0057] Hexamethylenetetramine: 1.5%;

[0058] Cetylpyridinium chloride: 3.5%;

[0059] Aminotrimethylenephosphonic acid (ATMP): 5%;

[0060] Hydroxyethylenediphosphonic acid (HEDPA): 5%;

[0061] Dodecyl dimethyl benzyl ammonium chloride (1227): 25%;

[0062] Methanol: 5%;

[0063] Water: 23%.

[0064] The preparation process of imidazoline derivatives, the production method and evaluation reference standard of salt-tolerant corrosion and scale inhibitor for oil wells are the same as Example 1, and the code name is HZ-1B.

[0065] Effect of use: Performance evaluation is carried out by using oil well production fluid with a salinity of 125700mg / L, the water type is calcium chloride type, free CO 2 Concentration 26mg / L, H 2 The concentration of S is 0.36mg / L, and the pH value is 7.84. When the dosage ...

Embodiment 3

[0072] For oil well salt-resistant corrosion and scale inhibitors, the weight ratio of each component is:

[0073] Imidazoline derivatives: 35%;

[0074] Thiourea: 3%;

[0075] Hexamethylenetetramine: 1.5%;

[0076] Cetylpyridinium chloride: 4%;

[0077] Aminotrimethylenephosphonic acid (ATMP): 5%;

[0078] Hydroxyethylenediphosphonic acid (HEDPA): 5%;

[0079] Dodecyl dimethyl benzyl ammonium chloride (1227): 23%;

[0080] Methanol: 3%;

[0081] Water: 20.5%.

[0082] The preparation process of imidazoline derivatives, the production method and evaluation reference standard of salt-tolerant corrosion and scale inhibitor for oil wells are the same as those in Example 1, and the code name is HZ-1C.

[0083] Effect of use: The performance evaluation is carried out by using the oil well production fluid with a salinity of 153700mg / L. Water type is sodium bicarbonate type, free CO 2 Concentration 13mg / L, H 2 The concentration of S is 0.56mg / L, and the pH value is 6.51. ...

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PUM

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Abstract

The invention relates to a salt tolerant corrosion and scale inhibitor for underground oil-gas wells and a preparation method thereof. The salt tolerant corrosion and scale inhibitor is composed of an oxazoline derivative, thiourea, cetyl pyridinium chloride, dodecyl dimethyl benzyl ammonium chloride, amino trimethylene phosphonic acid, hydroxyethylidene diphosphonic acid, hexamethylenetetramine, and methanol. The corrosion and scale inhibitor has very strong salt resistance, and under high salinity conditions (100000-200000mg/L), has a significant inhibiting effect on metal corrosion, and the corrosion inhibition rate can reach more than 80%. The organic phosphonic acid molecular structure of the reagent contain a double bond structure, the structure and the calcium ions and magnesium ions in water can chelate to form a stable complex to be adsorbed on seed crystal surface active sites, thereby inhibiting crystal normal growth. With significant scale inhibiting effect and a scale inhibiting rate up to 94%, the product is suitable for inhibiting corrosion and scaling phenomena of oil-gas well rods and pipes containing carbon dioxide, hydrogen sulfide and other complex media conditions under high salinity.

Description

technical field [0001] The invention relates to the field of anticorrosion of oil production equipment in oil fields, in particular to a salt-resistant corrosion and scale inhibitor used for oil and gas downhole pipe strings and a preparation method thereof. Background technique [0002] At present, the formation water in the production medium of some oil wells in the oil field has high salinity, high content of chloride, calcium, magnesium and other ions, and contains H 2 S, CO 2 Corrosive gas, low pH value, this produced liquid has a strong tendency of corrosion and scaling, resulting in frequent corrosion and scaling of rods and pipes. This brings huge economic losses to the production and operation of oil and gas wells, and becomes a hidden danger to the normal production of oil fields. [0003] Anti-corrosion and anti-scaling technologies are often used in oil fields, including: cathodic protection, spraying organic coatings, and dosing chemicals. Among them, the che...

Claims

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Application Information

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IPC IPC(8): C09K8/54C09K8/528
CPCC09K8/528C09K8/54C09K2208/20C09K2208/32
Inventor 刘云杜清珍吴刚谢刚李翠琴姜伟祺商芳李刚梁魏爱军
Owner PETROCHINA CO LTD
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