摘要
以一个五点法注水井网 1 /4单元正韵律油层数值抽象地质模型为例 ,利用多功能模拟器 ,首先对垂直井生产 ,然后改用超短半径侧钻水平井开采油层顶部剩余油 (两种生产方式含水率均达 0 .98时结束 ) ,按此生产方式用油藏工程和数理统计处理模拟结果 ,得到一个水平井比垂直井采收率增加相对值的多元回归公式 ,然后用Сипачев水驱特征曲线计算最大可采储量 ,用Arps递减指数为 0 .5的递减曲线计算产量剖面 ,并用正交设计对不同的参数方案进行侧钻水平井的经济评价。根据评价结果 ,基于投入产出平衡的原则 ,用多元回归法得到了一个用侧钻水平井开采水驱后正韵律油层顶部剩余油的可行性评价公式 ,该公式考虑了影响侧钻水平井效果的 3类主要因素 :油藏参数、井参数和经济参数。研究表明 ,侧钻水平井是开采成熟油田剩余油非常重要的技术 ,有很大潜力。表 1参
By using numerical reservoir simulation of 1/4 unit of a five spot pattern in a positive rhythm reservoir, which is first produced by the vertical well to water cut 98%, then by the horizontal sidetracking to water cut 98%, a multiple regression formula of relative increase of recovery factor of the horizontal sidetracks in contrast with the vertical well was obtained by using reservoir engineering and mathematical statistics. Then using the Cipachev water displacement curve the maximum recoverable reserve was calculated, using the decline curve of the Arps decline index n =0.5 the production profile was simulated and by applying the orthogonal design to different parameter programs the economic evaluation of the horizontal sidetracks was carried out as well. In terms of the results of evaluation, a formula for evaluating practicability of producing remaining oil at the top of positive rhythm reservoir by horizontal sidetracking has been proposed, which is based on the principle of balance between investment and output. The formula considers 3 main kinds of factor affecting the effects of the horizontal sidetracking: reservoir parameters, well parameters and economic parameters. It is shown that horizontal sidetracking is a very important technology for producing remaining oil of mature oilfields, which has a very large potential.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期60-66,共7页
Petroleum Exploration and Development
