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.

Evaluation of Bubbling Agent Performance and Optimization of Parameters in SuA Block of Surig Gas Field

“…In response to the above problems, drainage gas extraction process is commonly used in Surig gas field, and drainage gas extraction is a key technology to control the water production of gas wells and increase the production capacity of gas wells at present and in the future for quite a period of time, and foam drainage gas extraction has the advantages of simple equipment, convenient construction, fast results, low cost, and does not affect the normal production of gas wells, which is the main way of extracting the liquids from the wells in the Surig gas field at present [3]. However, there are natural gas light hydrocarbons in the recovered fluid of Su A block, and these light hydrocarbons are easy to interact with the foaming agent, which has a great influence on its effect of soaking and draining, and most of the gas wells are installed with throttles, which affects the implementation of this technology to a certain extent [4]. Therefore, it is urgent to optimise the parameters of the bubbling process and improve the suitability of the foaming agent and block gas wells.…”

A new method of Arps decline research - nonlinear fitting

“…Production decline is divided into three types according to the size of decline index (n) : exponential decline (n=0), hyperbolic decline (0<n<1) and harmonic decline (n=1). These three kinds of decline are widely used in the research and prediction of the production decline law of oil and gas fields (or Wells) [4][5][6][7].…”