Optimization and Controlling of Gas Hydrate Mitigation Methods in the Gas Wellhead Flowlines

Australian Journal of Basic and Applied Sciences

article

Abdelaziz A. Noaman

关键词: Gas Hydrate;    Methanol;    Heater;    Mono Ethylene Glycol;    Low Dosage Hydrate Inhibitors;   

DOI  :  10.22587/ajbas.2022.16.1.2

学科分类：社会科学、人文和艺术（综合）

来源: AENSI

【 摘 要 】

Natural gas hydrate is a crystal composed of water molecules and light hydrocarbons. The high pressure and low temperature are satisfactory conditions for hydrate formation. However, the formation of hydrates causes clogs in gas-carrying pipelines, preventing transportation. Every day over two million US dollars are spent in the petroleum industry to prevent the formation of hydrates. The purpose of this paper is to investigate the hydrate formation phenomena at the eight gas wells of the gas project at different gas compositions in winter, different operating temperatures and pressures, and examine all available hydrate inhibition methods to select the most known method to solve the hydrate problems in the gas wells during the winter period mitigate. The available hydrate inhibition are methanol injection, monoethylene glycol (MEG) injection by piggyback with regeneration at CPF, low dosage of hydrate inhibitors (LHID), wellhead heating before pressure reduction e.g. B. using a gas-fired water bath heater. The PIPESIM steady-state simulator was used to calculate the hydration temperature for the eight wells in lean and rich winter gas compositions at different operating pressures and temperatures. Based on the hydration formation curves for the eight gas wells at rich and lean compositions, it can be stated that hydration inhibition is required at each flow line of the gas well head, especially in winter. Technical and economic comparisons were made between these available methods, based on suitability in North African countries, to select the most applicable method required for gas projects to mitigate the hydration problems in the gas wellhead flowlines. It has been determined that the methanol injection process is the best available process to use. Wellhead heating is considered a viable alternative to the methanol injection method, the required heat output for heating is 200 kW. Ambient temperature and water cut sensitivities were run on the eight gas wellhead flowlines at lean and rich gas compositions by the PIPESIM software. It has been found that the methanol dosing rate increases with decreasing ambient air temperature and increasing water fraction. The OLGA transient simulator was used to calculate the methanol dosing rate for each gas source at different ambient and soil temperatures. A comparison was made between the results of the two simulators and it was found that the methanal dosing rates in the OLGA results are 48% higher than the methanal dosing rates in the PIPESIM results.

【 授权许可】

Unknown