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LAPSE:2023.4874

A New Method of Quantitatively Evaluating Fracability of Tight Sandstone Reservoirs Using Geomechanics Characteristics and In Situ Stress Field

Liangbin Dou, Xiongdi Zuo, Le Qu, Yingjian Xiao, Gang Bi, Rui Wang, Ming Zhang

February 23, 2023

Abstract
This paper studied the fracability of tight sandstone reservoirs by means of incorporating geomechanics properties and surrounding in situ stresses into a new model. The new fracability evaluation model consists of variables such as brittleness index, critical strain energy release rate index, horizontal stress difference, and minimum horizontal principal stress gradient. The probability of interconnection of a complex fracture network was quantitatively studied by the brittleness index and horizontal principal stress difference index. The probability of obtaining a large stimulated reservoir volume was evaluated by the critical strain energy release rate index and minimum horizontal principal stress gradient which also quantifies conductivity. This model is more capable of evaluating fracability, i.e., it agrees better with the history of production with a high precision and had correlation coefficients (R2) of 0.970 and 0.910 with liquid production of post-fracturing well testing and the average production of six months of post-fracturing, respectively. It is convenient that all model inputs were obtained by means of loggings. Using this model, tight sandstone reservoirs were classified into three groups according to fracability: Frac ≥ 0.3 MPa−1·m for Type-I, 0.22 MPa−1·m ≤ Frac < 0.3 MPa−1·m for Type-II, and Frac < 0.22 MPa−1·m for Type-III.

Record ID

LAPSE:2023.4874

Keywords

brittleness, critical strain energy release rate, fracability, horizontal principal stress difference, minimum horizontal principal stress, tight sandstone

Subject

Other

Suggested Citation

Dou L, Zuo X, Qu L, Xiao Y, Bi G, Wang R, Zhang M. A New Method of Quantitatively Evaluating Fracability of Tight Sandstone Reservoirs Using Geomechanics Characteristics and In Situ Stress Field. (2023). LAPSE:2023.4874

Author Affiliations

Dou L: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China
Zuo X: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China
Qu L: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China
Xiao Y: School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China
Bi G: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China
Wang R: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China
Zhang M: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an 710065, China

Journal Name

Processes

Volume

Issue

First Page

1040

Year

2022

Publication Date

2022-05-23

DOI:

https://doi.org/10.3390/pr10051040