HB1区块异常高压气藏气井合理产量研究

REASONABLE PRODUCTION OF GAS WELLS IN ABNORMAL HIGH-PRESSURE GAS RESERVOIR,HB1 BLOCK

HB1区块气藏属于典型的异常高压、低孔低渗、海相碳酸盐岩薄层气藏。由于异常高压气藏的特殊性,气井合理配产对气藏高效开发具有十分重要的作用。针对HB1井的地质特点,利用前期研究成果,采用合理生产压差法、气井流入与流出曲线法、无阻流量法、试采分析法和数值模拟法等5种方法对HB1合理产量进行了研究。通过综合分析认为,HB1井在试采初期的合理产量是48×104m3/d,如考虑在试采过程中压力敏感性、气藏压力变化对异常高压气藏开发效果影响较大,则这一阶段的合理产量应为30×104m3/d。按照这一思路与方法,确定了后续几口气井的合理产量。

Gas reservoir in HB1 Block is a typically abnormal high-pressure,low-porosity and permeability reservoir which is composed of marine carbonate thin layers.Because of abnormal high-pressure,an appropriate production proration of gas well can play a very important role in development.Based on both geologic properties and previous research,a reasonable production has been studied using five methods of reasonable drawdown pressure,gas-well inflow and outflow curve,open-flow capacity,production-test analysis and numerical simulation.Comprehensive analysis shows that the reasonable production of HB1 Well is 48×104m3/d in the early stage of production test.If the great effects of two factors,pressure sensitivity and pressure change,on development result are taken into account,the production should be 30×104m3/d.Therefore,the reasonable production of some other gas wells can be also determined.