摘要
长庆靖南油田为典型的低渗透油田 ,平均渗透率只有 1.6× 10 -3 μm2 ,油井测试中压力恢复极缓慢 ,要测到出现径向流直线段需要很长时间 ,不但影响产量 ,而且绝大多数测试井无明显的径向流显示。对缩短低渗透油藏测试时间的可行性研究表明 ,缩短测试时间 ,理论和实际上都是可行的 ,对于靖南油田生产主力油层 ,现场测试 2 0d左右的解释结果完全可以满足要求 ;同时 ,该油田投产时对油层均进行了压裂酸化改造 ,拟合参数值不到 0 .0 0 1,在常规解释中只要出现视直线段即可 ,不必测试到出现径向流段。图 1表 1参 2 (史仲乾摘 )
Jingnan oil field of Changqing oil field complex is a typical low permeability reservoir in the Ordos basin. Its average permeability is only 1.6×10 -3 μm 2, and average output is 4.5t per day per well. In 1996, it was put on stream. At the initial test of the well, the pressure built up very slowly. It took a long time to test the radius directional flow and in most wells, which were tested, there were no obvious show of it. It not only affected the output, but was also difficult to collect the data. In 1999, a feasibility study of shortening the test time began. After more than one year, the stage achievement was available. It shows that in Well Chang 6 of the main reservoir in Jingnan oil field, the permeability is very low and it is feasible both in theory and in practice to shorten the test time. On the spot test, it only needed about 20 days to test the well and its result of the datum interpretation can also meet the needs completely. Meanwhile, just before this field came on stream, the reservoir was acid fractured, whose value of C _D e 2 S didn't get to 0.001. In the common interpretation, it will be good enough when the straight line appears and will not test the radius directional flow any more. This article utilizes a mass of the spot test information to analyze and research the feasibility of shortening the test time.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2002年第3期74-75,共2页
Petroleum Exploration and Development
