关键词: 水平井, 水平井段长度, 优化设计, 净现值, 模型

Abstract: The existence of the optimal horizontal section length of a horizontal well is comfirmed through analying the change of the incomes and expenses of a horizontal well with the prolonging of its horizontal section length. In the optimization model, much attention is paid to the special constraint on horizontal section length and the selection of objective function of the model, without which the optimal horizontal section length can not be worked out smoothly. By analying the relationship between them, the absolute and relative measurements, i. e. NPV & NPV/L, become parts of organic whole and the optimization model is thus set up. It is shown that the horizontal section length will be designed too long to be the optimal length if the special constraint is withdrawn from the model, and furthermore, to the same horizontal well its optimal length is different in the different cases whether vertical wells are drilled together with the horizontal well or not. Qualititively, the optimal length of horizontal wells drilled together with veftical wells are always longer than those of horizontal wells in which case only horizontal wells are drilled.

Key words: horizontal well, horizontal section length, optimization design, net worth of present value, model