China oil network news as of August 11th, the new Daqing research and development of downhole throttling technology in Oil Production Engineering Research Institute of the success of the 4 new wells used in Song deep block 9, wellhead pressure decreased significantly, reducing the ground construction investment, the cumulative cost of more than 800 yuan.
Downhole throttling technology new device research of Daqing Research Institute of production engineering including preset working barrel and tubing in any position throttling tool for gas hydrate freeze plugging production development, has been applied in 6 wells in Daqing oil field, the application of 3 wells, the success rate of 100%. This technology not only realizes the scientific research target of throttling down the pressure and avoiding the freeze blocking, but also reduces the capital construction and maintenance cost effectively.
The natural gas in Daqing oilfield is characterized by high temperature, high pressure and high carbon dioxide content. The formation of hydrate in production is fast, resulting in freeze plugging and shutdown of wellbore and ground pipelines, and short plugging period, which seriously influences gas well production. Daqing Oil Production Engineering Research Institute, after 3 years of research and development, in August 2016 to study the formation of Daqing oilfield gas well downhole throttling new technology.
According to the working conditions of each gas well, the researchers calculate the throttling tool parameters, design and install throttling tools suitable for depth, so that the flow rate of the gas through the gas reaches the critical flow state, and the pressure is greatly reduced. Downhole throttling technology can effectively inhibit hydrate formation, avoid freezing plugging, and reduce wellhead pressure significantly.
At the same time, low pressure gathering and transportation pipeline can be adopted on the ground, which not only reduces the cost of the well construction, but also has the function of prolonging the stable period of the gas well and reducing the sand production at the bottom hole. The application of this technology in production wells has effectively suppressed hydrate formation. No freeze plugging has occurred in the past year. The production condition is good and the rate of well opening is increased by 10%.
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