Y-shape separated production string and Y-shape commingled production string are the common completion strings for ESP artificial lift. Y-shape commingled production string configuration is simple and easy to be operated, allowing the production of multiple layers at the same time when the pressure condition and fluid properties are similar. Y-shape separated production string is designated for separated production of single layer of multilayer zones, uncontrolled commingled production and controlled commingled production, it is commonly conducted through slick line operation.
The oil well can be directly produced by flowing, if the flowing capability allows during the early stage of development. The use of electric submersible pumps for artificial lift oil production has the advantages of large liquid discharge, high wellhead pressure, requires less surface equipment, and therefore small foot space. It is the main method of artificial lifting in offshore oil fields development.
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Gas-lifting production is characterized with large flow rate, deep lifting depth, corrosion resistance, and easy for operation and management. It is suitable for wells with high fluid/gas ratio, deeper depth deviated wells and wells with sand production problems. Gas lifting production can produce larger production pressure difference within wellbore and is ideal for fluid extraction as a steady technology of oilfield development.
In addition, the main equipment of production technology (compressor, etc.) is installed above ground, making it easy for checking and maintainence. It also occupies less deck area and is suitable for offshore oilfield development.
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Introduction:
The design of the gas storage production completion string is simple and reliable. The upper part is equipped with a subsurface safety valve to ensure the safe and reliable closure of the gas well in an emergency. The sliding sleeve is installed at the lower part of the subsurface safety valve and is used for circulating well killing during operation to ensure operation safety. The lower part of the string is designed with hydraulic setting permanent packer to achieve the sealing of annulus, protecting the upper casing. The string meets the requirements of gas sealing, corrosion resistance, pressure resistance, temperature resistance, etc., supporting the operation of injection, production, and reservoir monitoring during the gas storage.
