Abstract:

Perforated completion is a main way of horizontal well completions. Now in most cases the calculation of horizontal well deliverability is on the basis of the whole horizontal wellbore length. At the same time, fluid flow is regarded as infinite conductivity in the horizontal wellbore. However, horizontal wellbore pressure drawdown does exist and cannot be ignored. In the aim of maximum output and even Darcy velocity distribution, based on filtration theory and fluid mechanics and taking into account of wellbore pressure drawdown and interdependence effect of formation flow and wellbore flow, this paper analyzed the effect of horizontal wellbore perforation degree (perforation wellbore length/ horizontal wellbore length),perforation position and density on the horizontal well deliverability. Findings show as followings: horizontal wellbore perforation degree has an optimal control range; perforation position close to the end of horizontal wellborn can improve horizontal well deliverability; changing perforation density along horizontal wellborn is not as effective to horizontal well deliverability as to Darcy velocity distribution. Through the study of the thesis, horizontal well perforation scheme can be optimized and supported by scientific theory analysis.

Key words: horizontal well, variable perforation density, partition perforation, deliverability optimization analysis