Abstract
When operating underground storage (UGS) of gas hydrates liquidation formed untimely could lead to serious consequences - a complete shut-in and elimination of its process. With a small fund operating wells with high daily output storage operation would entail a violation of technological regime, the failure of gas sales plans, increased hours of downtime operational fund. Therefore, ensuring the smooth and reliable operation of underground gas storage wells fund is an urgent task. The authors of the article developed a methodology for calculating the operational flow of methanol to prevent the formation of gas hydrates in UGS operation. On the basis of the developed technique using industrial operating data Punginskoye UGS made the study of technological modes of its work and recommendations to prevent hydrate formation in the underground gas storage wells.
Highlights
In production systems, processing and transportation of natural gas the formation of crystalline hydrates is a serious problem associated with the violation of technological processes working gas production equipment and pipelines
A method of preventing hydrate formation has been developed. It has been successfully tested in operation mode underground storage (UGS) of "pumping gas", by supplying methanol to the culling of problem wells, the operation of which has been complicated by hydrate formation in wellhead and ground communications
It has been found that reliable non-hydrated modes of wells and pipelines on UGS are implemented with sufficient content of methanol in the whole volume of gas withdrawn from the storage
Summary
In production systems, processing and transportation of natural gas the formation of crystalline hydrates is a serious problem associated with the violation of technological processes working gas production equipment and pipelines. Unlike gas deposits the characteristic feature of the operation of underground gas storage facilities (UGS) is the cyclical nature of the UGS work , when there is a periodic change in the direction of gas flow - from the formation (in season selection) into the reservoir (in the injection season). Under these operating conditions, the formation of hydrates, most often occurs in the gas sampling period from the formation at negative outdoor air temperature and higher sampling rates. Season selection is usually carried out from October to March, sometimes to the April
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