钻井模式及优化方法的研究

在钻进过程中,影响钻井速度和成本的主要因素是:钻头类型。钻压、转速、水力参数、泥浆性能和井底压差。为了优选这些参数。需要建立多元钻速方程和钻井成本方程。以及反映钻井工艺装备要求的约束条件。对于一只钻头钻进过程的优化,需要采用有约束的非线性规划方法,以解决诸参数的优选和参数间的优配。而全井钻进过程的优化则是一个多阶段的决策问题,其中每一只钻头方案的确定都是一次非线性规划,全井方案又是若干单只钻头方案的组合,解决这样一个复杂问题,需要利用动态规划原理和研究特殊的计算方法。

A STUDY OF DRILLING MODELS AND ITS OPTIMIZATI0N TECHNIQUES

The main factors that affect drilling perameters rate and cost are bit type,bit pressure,rotary speed,hydraulic perameters,mud properties and bottom hole differential pressure,To optimize these parameters,it is necessary to establish a multiple drilling rate equation and cost equation,as well as constraints imposed by drilling technology and equipment conditions.Non-linear programming method can be used for the optimization of each bit run to achieve proper selection of individual parameters and a good match between them.However,for a whole well optimization which is a combination of a series of optimization of bit run multi-interval decision technique should be considered,and special algorithm should be introduced.