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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (3): 335-339.doi: 10.11764/j.issn.1672-1926.2019.11.007

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New method for analysis of oil and gas well production decline

Nu-tao WANG1(),Ling-yun DU1,Hai-bo HE2,Huo-yang LIN2,Ming-qian ZHU1   

  1. 1.Oil and Gas Engineering Institute of Southwest Petroleum University, Chengdu 610500, China
    2.Research Institute of Petroleum Exploration & Development, Dagang Oilfield Company, CNPC, Tianjin 300280, China
  • Received:2019-07-10 Revised:2019-11-19 Online:2020-03-10 Published:2020-03-26
  • Supported by:
    The China National Science & Technology Major Project during the 13th Five Year Plan(2016ZX05048-004-005)

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Abstract:

According to the study of production decline law of oil and gas fields, many researchers have proposed a variety of production decline models, such as Arps model, SEPD model, Duong model and combination model. In practical production, due to the variety of declining models and different use conditions, it is difficult to choose the optimal decline model because of the complexity of decline models and different conditions. The usual practice is to fit the actual production data by linear fitting or nonlinear fitting method, and determine the selected model by the correlation coefficient. When use those methods, you will waste time on fitting each model. Based on this, a new production decline model is proposed in this paper. Through theoretical verification, it is determined that the model includes not only Arps decline law, but also SEPD model and Duong model. Through the analysis of actual production data, the method has high fitting accuracy and wide application range, which can effectively avoid the problem of model selection and provide a basis for the selection of decline analysis method.

Key words: Production decline, Arps model, SEPD model, Duong model, Combination model

CLC Number: 

  • TE151

Fig.1

Schematic diagram of various decreasing models"

Fig.2

New descending model combination chart"

Fig.3

Comparison of Arps declining model and new model"

Fig.4

Comparison of SEPD declining model and new model"

Fig.5

Comparison of Duong declining model and new model"

Table 1

Basic parameter"

参数数值参数数值
气藏初始压力/MPa16.7压裂裂缝条数9
气藏厚度/m12基质渗透率/(10-3 μm2)0.05
基质孔隙度/%8水平井水平段长度/m1 086

Fig.6

Comparison graph of various decreasing model fitting curves"

Table 2

Various decreasing models calculation comparison"

模型Arps模型SEPD模型Duong模型新模型
拟合相关系数0.7220.6160.8170.844
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