DOI: 10.24412/2076-6785-2021-4-54-56
Abstract
The paper presents the influence of various factors on the rate of carbon dioxide corrosion of oil and gas field equipment, the characteristics of the inhibitors used in the companies are given. The corrosion rate of steel in a brine saturated with carbon dioxide at flow rates of 0,5 m/s and 2 m/s was investigated by the gravimetric method. The results of evaluating the protective effect of a water-soluble nitrogen-containing reagent are presented; the positive effect of the addition of a nitrogen- or phosphorus-containing surfactant is shown.
Materials and methods
Materials: industrial samples of nitrogen-containing corrosion inhibitors designed to protect equipment in oil and gas production systems, water-soluble nitrogen- and phosphorus-containing surfactants. Methods: measurement of the corrosion rate of a brine saturated with carbon dioxide under dynamic conditions based on the weight loss of steel-20 samples, comparative analysis of the protective effect of reagents.
Keywords
corrosion inhibitors, surfactants, carbon dioxide corrosion, gravimetric method for measurement the corrosion rate
Abstract A large number of companies developing new gas condensate fields have faced the problem of carbon dioxide corrosion. The same occurs at the facilities of the second area of the Achimov deposits of Urengoy oil, gas and condensate field. Because of the lack of design solutions in terms of anticorrosive measures, specialists of Gazprom dobycha Urengoy LLC developed a system that includes several methods of corrosion monitoring. The article presents a scheme of monitoring of facilities exposed to carbon dioxide corrosion. All the implemented methods are described, and the results of the control are given. Materials and methods Gravimetric method of corrosion rate measurement, a method of corrosion rate measurement by measuring electrical resistance Results Each of the corrosion monitoring methods presented in this article separately does not cover all the relevant factors. The principle of superposition allows us to expand the boundaries of each corrosion monitoring method. The set of all applied methods allows safety operation of hazardous production facilities exposed to carbon dioxide corrosion. The corrosion monitoring system developed and introduced into production has shown its effectiveness for three years of constant operation and modernization. Continuous improvement of the methods included in the corrosion monitoring system allows continuous reducing of possible risk level of emergencies caused by a corrosive damage. Conclusions During the development and implementation of the corrosion monitoring system at the facilities of the second area of the Achimov deposits of the Urengoy oil, gas and condensate field, the following activities were implemented: 1. New gravimetric devices were developed and special locations for their installation were selected for infrastructure facilities of the gas condensate treatment plant developing Achimov deposits. 2. For the fi st time a measurement system of carbon dioxide corrosion rate in a gas-condensate medium by measuring the electrical resistance of the contact element installed in the pipeline (ER method).was tested at facilities of Gazprom dobycha Urengoy LLC. 3. The complex monitoring of parameters infl ing the intensity of carbon dioxide corrosion is organized: CO2 content, chemical composition of water, residual content of corrosion inhibitor, iron content in water, etc. 4. The main factors infl ing the rate of carbon dioxide corrosion under fi d conditions during the development of Achimov deposits were revealed. 5. A technology using a set of nondestructive methods of testing was developed for corrosion- prone areas subjected to maximum corrosion. 6. The concept of conducting an inspection of pipelines and equipment was revised. When planning, the intensity of corrosion was taken into account with allowance for the rates of corrosion obtained by gravimetric studies.
In the context of the corrosiveness of the fluid produced in the oil fields of "Udmurtneft" noted an increased number of failures downhole equipment on the productive fund. One of reason for reducing the effectiveness of corrosion inhibitors is the presence of iron sulfide in produced water. The article discusses the possible impact of the presence of FexSy on protection of water-soluble inhibitor of the brand Napor-1012. It is found that regardless of the type of formation water the of appearance the iron sulfide in system is accompanied by a significant increase of the corrosion rate of the metal, which is explained not only by the formation of galvanic couples between the precipitate and the metal surface of the equipment, but also the partial adsorption of reagent on surface of dispersed sulfide particle. In this work was determined the specific dosage of corrosion inhibitor for the treatment model four fields with different content of iron sulfide.
Cast iron pumps are widely used in a department of railcar tank cleaning to pump hot water which is necessary in the cleaning process. As a result cast iron impeller shows considerable corrosion after operating due to the high temperature of the pumping water.
For the first time in the fields of producing wells conducted pilot tests of encapsulated corrosion inhibitor, as a way to improve the effectiveness of protection against corrosion and increase the operating time of equipment at the expense of long-removal agent after treatment.
At present time the corrosion is a cause of serious hazard to the downhole equipment. It should be noted that the traditional protection technology of borehole equipment, such as injection of the inhibitor through annulus or dosing capillary tubes in this case ineffective.In this regard the current task is development of devices that allow preventing corrosion.
It was suggested a combined corrosion inhibitor N-M-1 (gi) which is a mixture of contact and volatile forms with a common component. The material is the most effective if combined with hydrotest of equipment and conservation. Itmay also be recommended for the temporary protection of pipe's internal surfaces in the factory and field conditions.
The paper presents data on operating experience corrosion sensors type ER CORROSOMETER® probes and Microcor® corrosion monitoring Probes in highly aggressive environments.
Analysis by JSC "Tatneft" proves that more than 39% damage to commercial steel pipelines that do not have internal protection from contact with the transport medium,is due to internal corrosion. To solve the problem of reducing damage to the pipes and reduce the negative impact on the environment due to the collapse of steel pipes must be carried out on their inner surfaces of corrosion protection.
In article the advantage of definition ofthe expense of weight corrosion inhibitor, submitted from the tank of dose installation in the oil-field equipment, with use of the converter of hydrostatic pressure Sapphir-22MP-VN-DG is considered.
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We assume process approach to the manufacturing activities at quality management of anode grounding electrodes and modules. We use the functional modeling technique to construct the formal functional-technological model manufacturing activity. The quality management procedures as well as the control documents and the quality correction processes are explicitly defined at the model. The process approach to the providing, manufacturing and delivery of anode grounding electrodes and modules leads to the quality improvement because of the improvement of the manufacturing control.
On the basis of available development and industrial experience in the field of manufacturing production with harded hardly loaded surfaces at operation by working by methods nanotechnology ion-vacuum pulse nitriding to increase manufacture let out and to master new products of mechanical engineering for application in various branches.