Ice blockage in natural gas wells
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We provided our customers with a set of natural gas production equipment. During production, natural gas wells may operate normally for several days at a time, but ice blockage can occur at other times. After ice blockage occurs, customers use methanol to melt the ice, and it can take several days for it to dissolve. **It has affected the efficiency of gas extraction, and the customer has been puzzled by this. I would like to ask gas production experts why the wellhead gas production tree and its downhole pipelines get clogged with ice How to take effective measures to avoid ice blockage?
No one will take it on; I’ll do it myself. When communicating with clients and gas production professionals, it is recommended to connect the tubing to the casing during gas production; if gas extraction through the tubing is not smooth, then use the casing for extraction. It is said that this method of gas extraction is commonly used. Are there experts on the forum? Could you provide an introduction to the structure of gas production wells and the processes used for gas extraction?
This post was last edited by lovelife1997 on 2018-5-9 at 17:20. 1. Hydrates form due to a decrease in production pressure and too high moisture content in the gas. 2. Hydrates do not form immediately; there is a process involved in the formation of ice blockages. These almost never occur in summer, but start to appear in wells with low gas volume in the latter half of autumn. During winter, wells with low gas volume and high liquid volume are the most prone to ice blockages. 3. How to prevent it: There must be dedicated staff/schedulers who monitor and analyze the real-time data changes from various gas wells at the SCADA production monitoring center, and issue warnings to the production operations department based on the severity of any abnormalities (for minor abnormalities that do not affect normal operations, the day shift staff can be notified to conduct inspections and provide feedback) ； In the case of emergency abnormal wells, it is necessary to report the situation to the relevant personnel immediately, regardless of whether it is day or night or what time of day it is, so that they can go to the site to address the issue. Otherwise, once a complete blockage due to freezing occurs, especially in winter, it is very difficult to resolve the blockage in a short period of time, and no methods will work; it may take until spring to resolve the issue. 4. For blockages in gas wells caused by hydrates, the fastest and most effective methods are the injection of alcohols and back-and-forth venting. The specific procedures to be followed must be determined based on the individual conditions of each well.