富县油田M区块长8低渗透油藏减氧空气驱效果评价

针对试验区块M低孔低渗、物性差及井间连通状况差等导致水驱效果差,产量递减较快等问题,为提高区块产量,考虑构造、井网完善程度的影响,利用撬装站作为注入平台,优选3口井实施减氧空气驱试验,取得了较好效果:试验区总产油量上升,注气后日产油增加0.3t,最高日增0.68t,含水率先上升后下降,由注气初期的2.3%下降至目前的1.9%,注气时能量恢复,产量上升;停注后能量下降,产量下降。持续稳定注气是井组稳产关键。气驱见效后,泵充满度提高,泵效提高,工况改善。综上,减氧空气驱相比较水驱开发具有优越性,对同类油藏开发具有一定指导意义。

Evaluation of Oxygen Reduced Air Flooding in Chang 8 Low Permeability Reservoir in Block M of Fuxian Oilfield

Aiming at the problems of poor water drive effect and rapid production decline caused by low porosity and permeability, poor physical properties and poor interconnection between wells in test block M, in order to improve block production, considering the influence of structure and well pattern perfection, using skidding station as injection platform, three wells were selected to carry out oxygen-reducing air drive test, and good results were obtained: the total oil production in test area increased, and the day after gas injection. Oil production increased by 0.3 t, the maximum daily increase was 0.68 t, water content increased first and then decreased, from 2.3% in the initial stage of gas injection to 1.9% at present,energy recovery during gas injection, production increased, energy decreased after stopping injection, and production decreased. Continuous and stable gas injection is the key to stable production of well group. After the gas drive effect, the pump filling degree, pump efficiency and working condition are improved. In summary, the oxygen-reduced air flooding has superiority over water flooding, and has certain guiding significance for the development of similar reservoirs.