Abstract:
In order to further promote the optimal operation of domestic underground gas storage containing hydrogen sulfide, taking X underground gas storage in north China as an example, targeted desulfurization operation technical countermeasures were put forward to prevent the safety problems caused by hydrogen sulfide in natural gas produced during the operation. It mainly included the technology of wellbore sulfur resistance, the technology of wellhead out-of-control remote ignition and the technology of surface hydrogen sulfide treatment. Domestic baosteel D114.3 mm BGT1 gas-sealed hydrogen sulfide resistant threaded tubing and downhole safety valve with compressive strength up to 34.5 MPa were selected underground. The sulfur wellhead was equipped with a runaway remote ignition system. On the ground, "activated carbon + desulfurizer" layered loading desulfurizer tower was mainly adopted to realize desulfurization of produced mixed gas, and sulfur dissolution was promoted by bidirectional pressure and bottom-hole heat conduction effect in combination with gas storage well. Through the exploration and implementation of a series of targeted technical countermeasures, the X gas storage reservoir had completely realized safe operation and zero accidents independently, which could provide a certain reference for the construction and operation of similar underground gas storage reservoirs.