Specifications of liquid-gas separators in the oil drilling solids-control equipment field

　　Principle of the liquid–gas separator: When overflow occurs in the wellbore and gas gradually enters the well from the geological formation, the pressurized, gas-containing drilling fluid returning from the wellbore passes through the choke manifold. The total flow rate is regulated by the choke manifold’s overflow valve before being discharged. The fluid then enters the upper section of the separator via the inlet pipe, where, based on principles such as centrifugal separation, pressure relief, and expansion, the dissolved gases are separated from the drilling fluid. Following this initial separation, the drilling fluid flows downward through a double-layer baffle, where it is further stratified, bringing the gas to the surface of the fluid. As the gas bubbles rupture, the drilling fluid and gas are effectively separated. The separated gas is then vented out of the separator through the top vent line and directed to a flare for ignition; the remaining drilling fluid exits the separator via the outlet pipe and returns to the drilling circulation system.

　　The Role of the Liquid-Gas Separator in the Solid-Control Equipment System for Oil Drilling

　　Classification of Liquid-Gas Separators

　　A liquid–gas separator is a device used to separate liquids from gases. Separation can be achieved through gravitational settling or centrifugal separation, and based on the installation orientation, separators are classified as vertical or horizontal types. In terms of sand removal, vertical separators generally perform better than horizontal ones. Internally, most separators employ a multi-stage baffle design within the vessel to increase the residence time of the liquid and enhance the liquid–gas contact area, thereby improving separation efficiency.

　　Liquid-Gas Separator Specifications and Parameters

　　In the field of oil-drilling solids-control equipment, the specifications of liquid–gas separators are typically defined by the inner-diameter dimension of the separator chamber. Common models include the BWZYQ-800, BWZYQ-1000, and BWZYQ-1200, with the appropriate model and specification selected to match the specific type of drilling solids-control system.

　　Liquid-Gas Separator Specifications and Parameters

　　Sand-Prevention for Liquid-Gas Separators

　　1. Bottom-discharge wastewater treatment is employed to control and manage the liquid level, ensuring the stability of the level gauge within the separator; specifically, bottom-discharge wastewater treatment is used in the liquid–gas separator to maintain a stable liquid level, while simultaneously addressing the issue of sand accumulation in the tank.

　　2. The liquid-gas separator tank is equipped with a gas-venting safety passage, ensuring smooth and complete gas discharge and enhancing gas treatment efficiency.

　　3. The liquid–gas separator employs a combination of centrifugal separation, impact-based physical separation, vacuum pump separation, and other separation technologies to ensure effective gas–liquid separation.

　　4. Spring-loaded devices are installed at all bends in the liquid supply line of the liquid-gas separator, and removable impact-resistant baffles are additionally fitted. These components can be periodically maintained and replaced as needed based on wear conditions, thereby extending the service life of the equipment.

　　5. The sulfur-resistant liquid-gas separator is manufactured and treated throughout using special fibers, which effectively prevents hydrogen sulfide in the gas stream from damaging the system.