The key enabler of cementing systems
In the field of oil and gas drilling as well as non-excavation engineering, the cementing system is like a bright pearl, escorting the safety and efficiency of the operation. The vacuum degasser, with its unique role, has become an indispensable key equipment in the cementing system. Its application is of great significance to improve the quality and performance of drilling fluid.
The working principle of vacuum degasser: subtle vacuum suction method
Vacuum degasser is mainly composed of vacuum pump, separation tank, inlet pipe, outlet pipe and control system. When the drilling fluid slowly flows into the separation tank, under the strong action of the vacuum pump, a certain degree of vacuum is rapidly formed in the separation tank. At this time, as the solubility of the gas in the low-pressure environment is greatly reduced, the gas in the drilling fluid will escape from the liquid phase as if breaking free, forming a tiny bubble. These bubbles slowly rise to the top of the separation tank by buoyancy and are eventually discharged out of the tank through the exhaust pipe. The drilling fluid after degassing treatment, as if regaining a new life, flows out of the liquid pipe, and returns to the solid control system for recycling, starting a new mission.
The key role of vacuum degasser in the cementing system
Precise density control: The presence of gas is like a discordant note, which will increase the density of drilling fluid for no reason. The vacuum degasser, like a skilled tuner, effectively reduces the density of the drilling fluid by removing the gas from the fluid, bringing it closer to the design requirements. This plays a pivotal role in controlling well pressure and preventing major accidents such as blowouts.
Dramatic increase in stability: Gas in the drilling fluid is like an unstable bomb, which will form bubbles and seriously destabilise the drilling fluid, leading to a drastic drop in its performance. The vacuum degasser, like a loyal guardian, removes the gas from the drilling fluid, thus dramatically improving the stability of the drilling fluid and prolonging its valuable service life.
Perfectly improved rheology: The presence of gas is like an invisible shackle that affects the rheology of the drilling fluid, increasing the viscosity and shear force of the drilling fluid and greatly reducing its fluidity. Vacuum degasser is like a magic key that can unlock this dilemma, remove the gas in drilling fluid and improve its rheology, so that the pumping performance of the drilling fluid is like a tiger and the drilling efficiency is greatly improved.
Reduce the wear of the pump: the gas in the drilling fluid will cause cavitation under the strong action of the pump, which will cause serious wear to the impeller, casing and other parts of the pump, just like the devil. The vacuum degasser is like a brave guardian, which can remove the gas in drilling fluid and reduce the occurrence of cavitation phenomenon, thus prolonging the service life of the pump and providing a solid guarantee for the smooth running of drilling operations.
Prevent corrosion of drilling tools: Gas in the drilling fluid will have chemical reaction with the surface of drilling tools, which is like a chronic poison, leading to corrosion of drilling tools. Vacuum degasser is like a smart doctor, it can remove the gas in drilling fluid, reduce the risk of corrosion of drilling tools, improve the service life of drilling tools, and ensure the safety and reliability of drilling operations.
Reducing the risk of wall collapse: Gas in the drilling fluid forms a film around the wall, which acts as a fragile barrier, reducing the support of the drilling fluid to the wall and greatly increasing the risk of wall collapse. The vacuum degasser is like a strong pillar, able to remove the gas in the drilling fluid, improve the support of the drilling fluid to the wall, reduce the risk of wall collapse, and lay a solid foundation for the success of the drilling operation.
Accelerating drilling speed: removing gas from drilling fluid can improve the performance of drilling fluid and increase drilling efficiency, just like injecting a strong power for drilling operation, thus accelerating drilling speed, shortening drilling cycle and reducing drilling cost.
Installation and Commissioning of Vacuum Degasser in Solid Control System: Fine Operation to Ensure Perfect Operation
The vacuum degasser is usually installed on the circulating tank of the cementing system like a bright star, and together with the drilling pump, vibrating screen, desander, mud remover and other equipments, it forms a complete and powerful cementing system. When installing the vacuum degasser, it is necessary to give full consideration to the convenience of its connection with other equipment and operating space. At the same time, to ensure that its installation position is stable and reliable, as rooted in the earth of the rock in general, to avoid shaking in the operation process, affecting its normal work.
The inlet pipe and outlet pipe of the vacuum degasser should be closely connected with the circulating tank and drilling pump in the solid control system respectively. The inlet pipe should be shortened as much as possible, like an unobstructed highway, to reduce the resistance and pressure loss of drilling fluid. The discharge pipe should be connected to the inlet of the drilling pump to ensure that the de-aerated drilling fluid can be pumped smoothly into the well to provide a constant flow of power for the drilling operation. The exhaust pipe of the vacuum degasser should be connected to the exhaust gas treatment unit of the solid control system or discharged to the atmosphere. When connecting the exhaust pipe, special attention should be paid to prevent the exhaust pipe from clogging, as to keep breathing smoothly, to ensure that the gas can be discharged smoothly, to ensure the normal operation of the vacuum degasser.
After the installation is completed, should be treated as a precious work of art in general, the first vacuum degasser for fine debugging to ensure its normal operation. When debugging, first start the vacuum pump, carefully check whether the operating status of the vacuum pump is normal, whether the vacuum degree reaches the design requirements. Then, slowly introduce the drilling fluid into the vacuum degasser, as if injecting the source of life, check whether the inlet pipe and outlet pipe are unobstructed, and whether the flow rate and pressure of the drilling fluid are normal and stable. At the same time, closely observe whether there is gas discharged from the exhaust pipe and whether the amount of discharged gas meets the requirements. In the debugging process, if any problem is found, it should be adjusted and repaired in time, just like a doctor treating a patient in general, to ensure that the vacuum degasser can operate normally and play its maximum role.
Operation and maintenance of vacuum degasser: take good care of it to ensure long-term stable operation.
When operating the vacuum degasser, it should be operated in strict accordance with the operation regulations as if performing a sacred mission. Firstly, the vacuum pump should be started, and after the vacuum degree reaches the design requirements, the drilling fluid should be introduced into the vacuum degasser, just like starting a wonderful performance. During the operation, it should be like a vigilant sentinel, paying close attention to the changes of parameters such as vacuum degree, drilling fluid flow and pressure. Once abnormalities are detected, the machine should be shut down immediately for inspection, as if responding to an emergency, to ensure the safe and stable operation of the equipment. When it is necessary to stop the operation of the vacuum degasser, the valve of the inlet pipe should be closed first to stop the introduction of drilling fluid, as if cutting off the source of life. Then shut down the vacuum pump, like ending a wonderful performance.
Regularly check the components of the vacuum degasser, such as vacuum pump, separation tank, liquid inlet pipe, liquid outlet pipe, etc., as a doctor for the patient’s physical examination, to ensure that it is in good working condition. Regularly clean the sediments and impurities in the separator tank, just like cleaning the room, to prevent them from blocking the inlet and outlet pipes and affecting the normal operation of the equipment. Regularly check the sealing performance of the vacuum pump, such as checking the sealing of doors and windows in general, such as found poor sealing should be replaced in time to ensure the stability of the vacuum degree. Regular lubrication and maintenance of the vacuum degasser, such as adding lubricant to the machine in general, to ensure that the operation of its various components are flexible and free, to extend the service life of the equipment.
Vacuum degasser, the bright star of the solid control system
As an important equipment in the solid control system, vacuum degasser has irreplaceable significance in improving the quality and performance of drilling fluid, protecting drilling equipment and improving drilling quality. In practical application, vacuum degasser should be selected and installed reasonably according to the requirements of the solid control system and the characteristics of drilling operation, and operated and maintained in strict accordance with the operating procedures to ensure its normal operation and play the greatest role. At the same time, with the continuous progress of science and technology, the performance and technical level of vacuum degasser will be continuously improved, just like the stars in the night sky, more and more bright and dazzling, to provide more powerful support for the development of the solid control system and the safe and efficient drilling operations.
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