辽河油田双6储气库注采能力评价

Evaluation on injection-production capacity of Shuang 6 storage in Liaohe Oilfield

为保证辽河油田双6储气库应急调峰期间强注强采和安全运行要求,以SL1井为例,综合考虑库区地层压力安全区间10~24 MPa、注采管柱抗冲蚀及地层携液能力三方面因素,开展双6储气库注采能力评价研究。在2017-2020年“四注四采”周期内,连续开展产能试井,监测流压与注采气量,建立二项式产能方程,计算不同地层压力下的极限注采气量;计算得到?114.3 mm气密封注采管柱的临界冲蚀流量及临界携液流量,确定单井安全注采制度;总结SL1井地层压力随累计注(采)气量变化规律,预测该井安全累计注气量为0.942×10^(8)~2.713×10^(8)m^(3);在库区连通并达到统一压力系统后,预测当双6库区安全库容为7.623×10^(8)~34.510×10^(8)m^(3)时,才能保证地层压力及注采气容量满足气库安全运行。

In order to ensure the intensive injection,production and safe operation of the Shuang 6 storage in Liaohe Oilfield during the peak shaving period,taking Well SL1 as an example,the injection-production capacity of the Shuang 6 storage was evaluated by considering three factors including safe formation pressure of 10−24 MPa,erosion resistance of injection-production string,and formation liquid-carrying capacity.During the period of“four injections and four productions”from 2017 to 2020,the tests for determining well productivity were carried out continuously,the flow pressure and gas injection-production volume were monitored,and the binomial productivity equation was established to calculate the limit gas injection-production volume under different formation pressures.The critical erosion flow rate and critical liquid-carrying flow rate of theØ114.3 mm gas-sealed injection-production string was calculated,and the safe injection-production system of a single well was determined.Summarizing the change law of formation pressure in Well SL1 with the cumulative gas injection(production)volume,it is predicted that the safe cumulative gas injection volume of the well ranges from 0.942×10^(8) m^(3) to 2.713×10^(8) m^(3).After the storage area is connected and reaches a unified pressure system,it is predicted that only when the safe storage capacity of the Shuang 6 storage ranges from 7.623×10^(8) m^(3) to 34.510×10^(8) m^(3),can the formation pressure and gas injection-production capacity meet the safe operation requirements of the storage.