利用遗传算法求取气井真表皮系数

True skin factor of gas well calculated by a genetic algorithm

对于等时试井,可以对由多条径向流段解释得到的视表皮系数进行线性回归获得气井真表皮系数,但该方法不适用于四点回压试井。提出了在气井试井解释模型中引入真表皮系数,并应用遗传算法进行气井试井解释自动拟合求取气井真表皮系数的方法。利用该方法对渤海某油田A气井实际测试数据进行了解释,取得了很好的拟合效果。

For an isochronal well test,the true skin factor of a gas well could be obtained by a linear regression of apparent skin factors resulted from interpretating several stages of radial flow.But it is not applicable to four-point test.Therefore,a new method to acquire true skin factor is developed,in which the true skin factor is introduced into an interpretation model of gas well test,and the interpreted results of gas well test are automatically matched by using a genetic algorithm.Applying the new method to interpretating the measured data in Well A of an oilfield,Bohai Sea,has resulted in a quite good match effect.