Study on production decline law of fracturing wells in southeast Sulige tight gas field

Abstract

The main exploitation strategies in southeast Sulige gas field of Ordors Basin are hydraulic fracturing and downhole throttling are mainly adopted. Fractured wells in southeast Sulige gas field have no real stable production process, and the production is constantly decreasing. Fitting effect of adopting one decreasing method to investigate production decline is poor, such as Arps decline, SEPD decline and Duong decline methods. Because of such problems and production characteristics of southeast Sulige, a three-stage decline law study is put forward. The early production decline of gas well belongs to exponential decline, the middle stage belongs to exhaustion decline, and the intermittent exploitation stage belongs to linear decline mode. Most of the production of gas well comes from early and middle production. The study of decline law could provide certain guidance for the evaluation of recoverable reserves and development strategy.