Proceedings Article | 26 September 2024
KEYWORDS: Resistance, Liquids, Design, Materials properties, Bending stress, Industrial chemicals, Temperature metrology, Structural design, Pipes, Chemical reactions
In response to the wax deposition problem in High-Temperature, High-Pressure (HPHT), high-wax content deep condensate gas reservoirs, taking the Bozi condensate gas field in the Tarim Basin, China as an example, a development method of injection valve for HPHT, high-wax content deep condensate gas reservoirs is proposed utilizing principles of mechanics and structural design methods, which includes analysis of material selection, post-heating mechanical properties of the materials, and the structure of the injection valve. The valve strength, connection strength, and pressure-bearing capacity under high pressure were calculated. Compared with the allowable strength of the material, the effectiveness of the design method has been verified. Meanwhile, laboratory experiments were conducted on chemical injection valves, including rupture disc rupture test, bottomhole flow pressure injection test, and 2000 m injection pipeline flow friction test. It was found that, firstly, under normal temperature conditions, the rupture disc rupture pressure was 42 MPa. Under the working condition of 100°C, the rupture pressure of the rupture disc is 44 MPa, which is greater than the design pressure of the rupture disc (40 MPa) and can meet the requirements of underground operations. Secondly, under different pressures, a large number of liquid flows out of the outlet end of the relief valve and the injection valve opens, indicating that the test is qualified. Thirdly, Under the maximum injection flow rate of 0.76 L/min designed for the injection valve, the frictional resistance of the 2000 m pipeline is approximately 67 MPa. The maximum downhole flow pressure at the injection point is calculated at 90 MPa. The opening pressure of the injection valve is 10-15 MPa, and the 2000 m pipeline can meet the on-site injection requirements. The research results will reduce unsafe incidents such as wax deposition in wellbores and column blockages and improve the efficiency of condensate gas reservoir exploitation.
