Relevant problems and new technology of natural gas fields development in the twenty-first century.The offered algorithms of optimal control of methanol flow rate allows to improve the confidence level of diagnosis and to use methanol more reasonable. According to this we can increase methanol flow rate in case of the beginning of hydrating or correct THT using knowledge data base, but methanol flow rate remains the same. The dynamic of pressure changing on the entrance of Gas Processing Plant is checking. If while monitoring gas temperature on the entrance of Gas Processing Plant is lower than THT, the additional testing is carried out. These meanings could be get in real time. In order to detect THT temperature and pressure measurement are used.
To optimize methanol flow rate it is offered to use following algorithm of operational control. It is offered in the article to count methanol flow rate according to theoretical hydrating temperature (THT). That’s why surplus amount of methanol is given to the well. Methanol underconcentration makes it from inhibitor to catalyzator. This is caused by difficulties of collecting measuring information for calculation and by difference in operation processes of wells, pipelines and collectors. There are many known methods of injection, but they don’t provide real time optimalization of methanol flow rate. This regime is achieved by well injection of hydrate growth inhibitor. Hydrating occurs at any stage of reservoir development, so it’s very important to establish non hydrating regime. Hydrating depends on pressure-temperature conditions, gas composition and specific humidity of gas. Hydrating is a great problem for a gas-field gathering system specially for high north’s gas foundations. Technical requirements for casing and tubing made of martensitic steel containing 13% chromium are formulated. In order to prevent carbon dioxide corrosion propositions for the use of casing and tubing made of martensitic steel containing 13% chromium were submitted. The causes and mechanisms of carbon dioxide corrosion destruction of the pipe body are analysed. The results of metallographic examination of the pipe material subjected to pitting carbon dioxide corrosion are presented. The results of studies of pipes metal are considered. A method of laboratory studies for fragments of pipe defects in the form of pits on the inner surface and through holes is proposed. The problems of carbon dioxide corrosion of well equipment at the Bovanenkovo and Urengoy oil, gas condensate fields, which is very dangerous for the well equipment, are considered. General patterns of stress corrosion cracking of steel, which has a decisive influence on the possibility of using casing and tubing for the production of hydrocarbons at high concentrations of carbon dioxide are described.
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