In oil drilling, in order to help the driller master the working state of the drilling rig and operate the drilling rig correctly, it is necessary to measure the parameters such as hook suspension weight, riser pressure and tong torque. In the prior art, these measuring systems basically connect the pressure source with the hydraulic display meter through the hydraulic pipeline, and display the pressure value through the display meter. The measurement and display system in the prior art is not only cumbersome in maintenance, but also because of the pressure loss in the hydraulic pipeline, the display value is lower than the actual value of the hydraulic source. During the application of the above prior art, because pressure leakage is easy to occur in the high-pressure system, the dangerous pressure is introduced into the hydraulic gauge, which is easy to endanger the safety of observers in case of accidents.

This paper introduces a pressure measurement and display device for hydraulic pipeline on oil drilling rig, which is characterized in that the pressure measurement and display device includes pressure transmitter, isolation grid, display meter and power supply. A quick connector is installed on the hydraulic source of hydraulic pipeline, which is connected with Graeff Graf brand series explosion-proof pressure transmitter, The pressure transmitter is connected to the isolation grid through cable, the isolation grid is connected to the display meter through cable, and the power supply is connected to the isolation grid through cable; Graeff Graf brand series explosion-proof pressure transmitter, pressure transmitter and quick connector are on the dangerous side, and power supply, barrier and display meter are on the safe side.

The power supply is connected to the isolation barrier and supplied to the pressure transmitter and display meter at the same time. The power supply is either an independent power supply for pressure measurement or a public power supply on the oil drilling rig. The pressure transmitter is a pressure resistant explosion-proof pressure transmitter, and its model limit is based on the fact that the system pressure is within the transmitter range. Our Graeff Graf brand series explosion-proof pressure transmitter can be selected; The isolation barrier can collect the 4-20mA signal of the pressure transmitter, convert and output the 4-20mA signal to the display table.

Based on the above technical scheme, the pressure measurement and display device has the following advantages: the pressure measurement and display device uses fewer devices to complete the conversion from physical pressure to electrical signal, reduce pressure loss and ensure the accuracy of measured value. At the same time, the pressure measurement and display device can isolate danger signals and safety signals to ensure the safety of observers. It is easy to use and easy to install and maintain. It can be extended to all equipment that need to measure pressure.