论文部分内容阅读
杏子川采油厂坪桥区整体上属于安塞油田,位于陕西省安塞县、志丹县、子长县及延安市的宝塔区之间,与靖安、双河油田毗邻。该区块主要含油层位为长4+5、长6油层,油区面积近125 km2,开发面积64 km2,油区地面海拔1 100～1 500 m,平均1 200 m,属典型的黄土高原丘陵沟壑区。近年来的实测压力资料统计结果表明,目前老井井底流压为2.78 MPa,静压为4.69 MPa,静压只有原始地层压力的1/3;新井流压静压分别为4.69、6.40 MPa,压力下降较快,可见压力保持水平较低,地层能量缺乏;相同采出程度下含水率明显偏高,水驱动用程度33.87%,含水98%时的采出程度为17.66%。说明坪桥油区目前水驱动用程度低,最终采收率也低于同类油藏水平,所有提高注水开发效率迫在眉睫。
The Xingzi River Oil Production Plant Pingqiao District, as a whole, belongs to Ansai Oilfield. It is located between Ansai County, Zhidan County, Zichang County and the Pagoda District of Yan’an City, adjacent to Jing’an and Shuanghe Oilfields. The main oil reservoir in this block is 4 + 5 in length and 6 in Chang 6. The area of oil area is nearly 125 km 2 and the development area is 64 km 2. The surface of oil area is 1,100-1,500 m above sea level with an average of 1,200 m. It is a typical loess plateau Hilly and gully area. The statistical results of measured pressure data in recent years show that the current well pressure at the bottom of the well is 2.78 MPa, the static pressure is 4.69 MPa and the static pressure is only 1/3 of the original formation pressure. The static pressures of the new well are 4.69 and 6.40 MPa respectively, The rate of water retention was 33.87% and that of water at 98% was 17.66%. It shows that the current level of water drive in Pingqiao Oil Region is low and the ultimate recovery rate is lower than that of similar reservoirs, all of which are urgently needed to improve the efficiency of water injection development.