Tag Archives: hydration
Gas’ temperature and pressure decrease during the transportation from the well to the complex gas treatment plant. As a result hydrate plugs form and it causes alarm situations. Conditions of gas hydrate formation are analyzed in the article. The most probable places of gas hydrate formation are detected.
The main way of gas hydration control is the creating condition of thermodynamical instability of hydrates. The thermal, technological and chemical methods are used for gas hydration control. In the case of gas hydration occurs, it is liquidated by pressure leakage, methanol injection, local heating or by combination of mentioned methods. Using the concrete method depends on plug size, its location, outside temperature and others.
To prevent formation of hydrates it’s offered to increase the number of controlled parameters which influence hydrating. By the way temperature, pressure, oil-water content and methanol concentration in spent solution could be additionally measured.
It’s necessary to raise the level of making decisions when emergency situations occur. For that reason authors have offered to use expert system of operative management. This system should generate control instruction using cooperative processing. Database is formed by real-time data and by knowledge system formed by experts. There is database structure shown in the article.
Plugging solution after pushing into the annulus stays for a long time in quasi-crystalline state. Changes in the physical and mechanical properties of hardening cement can be explained by leaving hydration products of portlandcement with the filtrate. The article presents the results of studies on the effect of salt composition on the processes of the main components of portlandcement hydration.
Provides laboratory testing to simulate the process of cement hydration in downhole conditions. The influence of filtration processes on the conditions of well lining formation was evaluated with the device “tester of gas migration in cement solution”. As a result, studies revealed that the pore pressure drop is observed in all the investigated formulations of cement slurries used by oil companies. The intensity of pore pressure fall depends on the magnitude of water loss of cement solutions.