储气库注采阶段硫化氢运移规律的数值模拟

Numerical Simulation for movement laws of hydrogen sulfide during UGS injection and production

为了保证地下储气库安全连续供气,以陕X地下储气库为例,研究储气库中硫化氢在注采过程中的运移规律。基于相关气体的PVT实验结果,首先利用ECLIPSE软件中的PVTi模块建立组分模型,然后建立目标区块的地质模型和数值模拟模型进行分析。得出一定注采制度下硫化氢的运移规律:1注气阶段,硫化氢向井区东部区域、西南部区域以及中部S006井、S007井附近区域运移;2采气阶段,S003井与S005井硫化氢采出速度与采出总量明显高于其余井,表明硫化氢向S003井和S005井方向运移,因此,需要做好S003井与S005井的防腐与安全生产工作,从而保障陕X地下储气库的安全供气。

In order to ensure safe and continuous gas supply of underground gas storage （UGS）, Shaan X UGS was taken as the example to investigate the movement laws of hydrogen sulfide in the UGS during its injection and production. Based on the PVT test results of related gases, the compositional model was established at first using the PVTi module of ECLIPSE. Then, the geology model and numerical simulation model were built up for the target block. Finally, the movement laws of hydrogen sulfide in a certain injection-production schedule were obtained by these models. It is shown that at the stage of gas injection, hydrogen sulfide moves to the east, the southwest and the vicinity of wells S006 and S007 in the center. And at the stage of gas production, the cumulative production and recovery rate of hydrogen sulfide are the highest in Wells S003 and S005, and it is indicated that hydrogen sulfide moves towards wells S003 and S005. Therefore, it is necessary to focus on corrosion prevention and safety production of these two wells so as to ensure the safe gas supply of Shaan X UGS.