CAJ | 학술논문

水驱砂岩气藏型地下储气库通过注气驱水扩容，但是受储层非均质性以及水侵等因素的影响，实际运行过程中的库容量和工作气量大多低于设计值。为进一步优化气库注采效果，开展了多轮次的长岩心注采实验，分析注采过程中压力场分布及库容动用特征，研究影响扩容效果的因素。研究结果表明：随着注采轮次增加，注气排驱难度加大，排驱效果逐渐变差，趋于最大库容量；远井地区储层不能有效参与气库运行，注气后气库平衡压力低于上限压力，采气后气库平衡压力高于下限压力，导致实际库容量和工作气量达不到设计值；受储层孔喉分布非均质性、气驱压力梯度的限制以及采气循环边水的影响，排驱扩容增加的库容有限，注采模拟结束后，库容动用率仅为30%，工作气量占比也仅有21.6%。研究结果为水驱砂岩气藏储气库方案设计提供技术支持。
수구사암기장형지하저기고통과주기구수확용，단시수저층비균질성이급수침등인소적영향，실제운행과정중적고용량화공작기량대다저우설계치。위진일보우화기고주채효과，개전료다륜차적장암심주채실험，분석주채과정중압력장분포급고용동용특정，연구영향확용효과적인소。연구결과표명：수착주채륜차증가，주기배구난도가대，배구효과축점변차，추우최대고용량；원정지구저층불능유효삼여기고운행，주기후기고평형압력저우상한압력，채기후기고평형압력고우하한압력，도치실제고용량화공작기량체불도설계치；수저층공후분포비균질성、기구압력제도적한제이급채기순배변수적영향，배구확용증가적고용유한，주채모의결속후，고용동용솔부위30%，공작기량점비야부유21.6%。연구결과위수구사암기장저기고방안설계제공기술지지。
The capacity expansion of underground gas storage in water lfooding sandstone gas reservoir form can be realized through water lfooding. But inlfuenced by the reservoir heterogeneity and water invasion, the storage capacity and the working gas volume is mostly less than the designed value during the actual operation process. In order to optimize the injection production effect of gas storage, multi-rounds long core water-gas mutual lfooding experiments were carried out to analyze the pressure ifeld distribution and capacity utilization characteristics during the process, and to study the factors that affect the expansion. The study shows that with the more rounds of injection, gas displacement becomes more dififcult, and the displacement result gradually becomes poorer, tending to the maximum storage capac-ity. The reservoirs located in far well area cannot effectively participate in storage operation. The storage equilibrium pressure is less than the upper limit pressure after the injection; and it is more than the lower limit pressure after gas recovery, which causes the actual storage capacity and the working gas volume is always less than the designed value. Restricted by the reservoir pore throat heterogeneity and gas drive pressure gradient, and inlfuenced by side water cycle, the capacity expansion increased by the displacement is limited. After injection-production simulation, the capacity utilization rate is only 30%, and the working gas volume ratio is also only 21.6%.