Rapid judgment for corrosion of sodium bicarbonate water type oil well and corrosion inhibitor

A technology of sodium bicarbonate and corrosion inhibitor, which is used in the field of rapid judgment of corrosion and scaling of oil production wells in oilfields, to achieve the effects of shortening time, improving production life and saving production costs

Active Publication Date: 2010-04-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are no literature reports and patented technologies for rapid and qualitative judgment of oil well corrosion and scaling.

Method used

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  • Rapid judgment for corrosion of sodium bicarbonate water type oil well and corrosion inhibitor
  • Rapid judgment for corrosion of sodium bicarbonate water type oil well and corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: J22-27 well of a certain oil production plant in the eastern part of Huabei Oilfield: first carry out on-site sampling of the oil well, and carry out the full analysis of water quality in time according to the ministerial standard SY / T 5523-2005 "Oilfield Water Analysis Method" (within 24 hours after sampling) ), it is clear that the water quality type is sodium bicarbonate type, and its Ca / HCO 3 - The molar ratio is 0.45, it is judged that corrosion and scaling coexist, and local corrosion is serious. On this basis, a corrosion inhibitor for sodium bicarbonate type medium is added.

[0036] Well J22-27, preparation process of corrosion inhibitor for sodium bicarbonate medium: weight percent of each raw material: carboxylate imidazoline phosphate: 20%; water-soluble rosin-based imidazoline: 27%; dodecane Dimethyl benzyl ammonium chloride: 8%; amino trimethylene phosphoric acid: 3%; Put it into the normal-pressure enamel reaction kettle, slowly raise the...

Embodiment 2

[0038] Embodiment 2: J59-11 well of a certain oil production plant in the eastern part of Huabei Oilfield: at first carry out on-site sampling of the oil well, and carry out the full analysis of water quality in time according to the ministerial standard SY / T 5523-2005 "Oilfield Water Analysis Method" (within 24 hours after sampling) ), it is clear that the water quality type is sodium bicarbonate type, and its Ca / HCO 3 - The molar ratio is 0.81, and it is determined that the wellbore of the oil well is mainly corroded. On this basis, a corrosion inhibitor for sodium bicarbonate type medium is added.

[0039]Well J59-11, the preparation process of the corrosion inhibitor for sodium bicarbonate medium is the same as that in Example 1. Percentage by weight of each component: carboxylate imidazoline phosphate: 28%; water-soluble rosin-based imidazoline: 28%; dodecyldimethylbenzyl ammonium chloride: 5%; aminotrimethylene phosphoric acid: 1 %; hydroxyethylidene diphosphoric acid...

Embodiment 3

[0041] Embodiment 3: Well A11-16 of an oil production plant in the eastern part of Huabei Oilfield: firstly carry out on-site sampling, and carry out full analysis of water quality in time according to the ministerial standard SY / T 5523-2005 "Oilfield Water Analysis Method" (within 24 hours after sampling) , make sure the water quality type is sodium bicarbonate type, and then calculate Ca / HCO 3 - The molar ratio is 0.73, and it is determined that the wellbore of the oil well is mainly corroded. On this basis, a corrosion inhibitor for sodium bicarbonate type medium is added.

[0042] A11-16 well, the preparation process for the corrosion inhibitor of sodium bicarbonate type medium is the same as embodiment 1, the weight percentage of each raw material: carboxylate type imidazoline phosphate: 34%; Water-soluble rosin base imidazoline: 25%; Dodecyldimethylbenzyl ammonium chloride: 6%; Amino trimethylene phosphoric acid: 1%; Hydroxy ethylidene diphosphoric acid: 1%; Methanol: ...

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Abstract

The invention relates to rapid judgment for the corrosion of a sodium bicarbonate water type oil well, which is applied to the corrosion treatment of a pit shaft of the oil well. A production liquid is of a sodium bicarbonate water type. When the mole ratio of Ca to HCO3- is between 0 and 1 and less than 0.6, the corrosion which is local corrosion and scale formation coexist; along with the increase of the mole ratio of the Ca to the HCO3-, the scale formation of the pit shaft is relieved, but the corrosion becomes serious; and when the mole ratio of the Ca to the HCO3- is greater than 0.6, the pit shaft of the oil well is mainly corroded. The corrosion condition of a sodium bicarbonate water type medium is fast known through the mole ratio of the Ca to the HCO3-. A corrosion inhibitor for the sodium bicarbonate water type medium is made from the following components in percentage by weight: 20 to 35 percent of carboxylate sodium imida, 20 to 35 percent of water-soluble rosinyl imidazoline, 5 to 10 percent of dodecyldimethylbenzylammonium chloride, 0 to 5 percent of aminotri-methylene phosphonic acid, 0 to 5 percent of hydroxyl ethidene diphosphonic acid, 5 to 10 percent of methanol, 2 to 5 percent of dispersant and the balanced of water. The rapid judgment and the corrosion inhibitor can improve the efficiency of corrosion inhibition.

Description

technical field [0001] The invention relates to the technical field of oil production in oilfields, in particular to a method for quickly judging corrosion and scaling in oil production well shafts in oil fields and a treatment technology, and is a method for quickly judging corrosion and scaling in well shafts of oil production wells whose output medium is sodium bicarbonate and a method for mitigating corrosion. application of etchant. Background technique [0002] With the deepening of oilfield development, the water content of oil well production fluid is getting higher and higher, which makes the crude oil in the wellbore change from water-in-oil to oil-in-water, resulting in intensified corrosion of oil production equipment such as tubing and sucker rods. In the process of oil recovery and production, due to the change of temperature and pressure, the fouling of the wellbore becomes more and more obvious. In order to find out the causes and types of corrosion and scal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N33/18C09K8/54C09K8/52
Inventor 杜清珍南庆义谢刚王凤清
Owner PETROCHINA CO LTD
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