The R&D process for Aging cell Model 125-35
Ultra-high temperature pressure-bearing aging cell is a specially designed pressure vessel, which is matched with ultra-high temperature roller oven. It is mainly used for aging test in static or high-temperature dynamic state. After the test, the sample is still in liquid state when the sample temperature is higher than the boiling point of water.
This product is mainly focuses on high temperature resistance, and is invented from four aspects: material, sealing, pressurization and safety protection. The material of this invention mainly adopts nickel-based high-temperature alloy with special treat process surface, thus improving the high-temperature resistance of the cell body. The sealing material shall be heat-resistant and corrosion-resistant and processed by special process. The sealing cover of the cell body is pressurized by the way of threaded connection of the flange plate of the cell cover, and the flange plate is provided with evenly distributed eight threaded holes. When apply the torque to tighten the flange plate, apply different torque forces at different times by a special torque wrench. There are three main aspects in safety protection: adding a protective cover to the exhaust valve in buffer zone between the cover and the draft tube, and preventing the explosion phenomenon caused by the backflow of drilling fluid in the cell.
Advantages of this product: high temperature resistance, high safety factor and good sealing performance, which can provide more accurate test results for aging test at high temperature and reflect the properties of drilling fluid or mud more accurately.
Product R&D background: Aiming at the problems of low safety factor, poor sealing performance and substandard temperature for the aging cell in the market, we developed this product.
The development of this project began in early April 2019, and after the completion of production, tests were carried out to verify its feasibility.
First of all, in the design process, we choose high temperature nickel-based alloy as the material of the cell body, but the test failed to achieve ideal results. Later, we improve the material processing technology, and specially treated the main overall structure of the cell body, which greatly improved the wear resistance, fatigue resistance, corrosion resistance and high temperature resistance of the parts.
After the completion of the cell structure, the experiment began on April 26th.
(1) The first test conditions
The test temperature is 240, the test time is 24 hours, and selected the modified tetrafluoroethylene gasket. See below picture for the testing process.
Test results: the sealing ring is deformed.
(2) Later, we change the material of the sealing ring to high temperature resistant alloy material, and carry out the following tests:
1) The first test conditions.
Test temperature: 316℃, test time: 24 hours. Test results: the sealing effect of the sealing ring is not good.
2) The second test conditions.
Test temperature: 316℃, test time: 24 hours, improve the processing technology of sealing ring. See below picture.
Test results: the sealing effect at the exhaust valve is not good.
3) Conditions of the third experiment
Test temperature: 316℃, test time: 24 hours, improve the processing technology of exhaust valve. Below picture show the test process.
After many tests, the final test was successful on May 9, 2019, and achieved the expected goal. The successful test photos are shown in the following picture.
At present, the first batch of ultra-high temperature pressure-bearing cell have been sent to users on May 15, 2019, and achieved good results. A large number of subsequent customers have also used it with good effect.