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LUQI equipment Co.
High Temperature Resistant Downhole Motor
- Description
- Review
High Temperature Resistant Downhole Motor
Our company produces two kinds of stators: one is conventional stator, with 95℃ as rated temperature and 120℃ as maximum temperature; the other is high-temperature stator, with 105℃ as rated temperature and 150℃ as maximum temperature.
It is unfavorable to the motor property, and it may intensify all disadvantageous factors if temperature goes too high. When using oil-based mud, the hole bottom temperature shall be lower than 95℃, then downhole motor shall be working in optimum condition. When temperature is over 150℃, stator life may be greatly shortened, even by using optimum oil-based mud or using water-based mud.
In order to keep downhole motor working normally at high temperature of oil-based mud, the way shall be adapted to conduct trip-in by sections and intermittent recycling.To ensure the actual temperature of stator below the ultimate value, hollow rotor with splitter hole can be used to speed up recycling or to improve heat radiation of the fluid and other property.
High temperature downhole motor are not suitable for use in normal temperature wells, so it is important to accurately grasp the bottom hole temperature.
On site measures to extend the service life of the stator：
1)Given that a certain volume of rubber elastomers absorb a certain amount of heat and fail, avoiding unnecessary high temperatures as much as possible can help extend their service life.
2)According to the first condition, when the downhole motor is lowered to the bottom hole, the pump should be started as soon as possible to circulate the drilling fluid (gas), in order to reduce the accumulation of thermal energy in the elastic body.
3)After fully circulating the drilling medium (recommended circulation of 1.5-2 hours), normal drilling can be carried out.
Oil-Based Mud Downhole Motor
Our company has designed and produced specialized downhole motor for oil-based mud or diesel based mud.
When using oil-based mud or diesel based mud, considering the swelling and cavitation of stator rubber caused by aromatic hydrocarbons in oil-based mud, the content of aromatic hydrocarbons should be controlled, and the aniline point of oil-based mud should be increased. Aniline point refers to the temperature at which the uniformly mixed oil and aniline in oil-based mud separate into two phases during cooling. Under normal circumstances, the aniline point of oil-based mud should be higher than 70℃, and when the bottom hole temperature is high, the aniline point should be higher than 93℃ or higher.
