Parametric Analysis in the Horizontal Stress Calculation Based on Numerical Inversion Method

 

Xian Shi

Ph.D. student
School of Petroleum Engineering, China University of Petroleum (East China) No. 66,Changjiang West Road, Qingdao, Shandong, China
e-mail: torresup@gmail.com

Yuanfang Cheng

School of Petroleum Engineering, China University of Petroleum (East China) No. 66, Changjiang West Road, Qingdao, Shandong, China
*Corresponding author; e-mail: yfcheng@126.com

Jun Cai

China National Offshore Oil Corporation – Zhanjiang Company, Zhanjiang, Guangdong, China
e-mail: nikebill@163.com

Yuanwei Sun

School of Petroleum Engineering, China University of Petroleum (East China) No. 66, Changjiang West Road, Qingdao, Shandong, China
e-mail: sunyuanwei6@163.com

Zheng Yuan

China Oilfield Services Limited, Tanggu, Tianjin, China
e-mail: yuanzheng601@163.com

 

 ABSTRACT

The estimation of in-situ horizontal stresses is regarded as a key factor in petroleum work related to reservoir geomechanics. The application of fracturing information through inversion method can predict the magnitude of in-situ horizontal stresses. However, as the data is abundant relatively, how to obtain a desirable stress value is still a challenge. This paper reviews the inversion technique method to process the obtaining horizontal in-situ stress from multi-well hydraulic fracture data and detail how to decrease the error as much as possible by the least square method (LSM). A filed study demonstrates the results of in-situ stresses computed by this inversion method have a good agreement to in-situ measurements. More importantly, we provide a basic standard to choose the reasonable fracturing data at certain well inclination and azimuth interval while perform parametric sensitivity under different well conditions. We found that the optimal horizontal inversion stresses are usually calculated by the breakdown pressure picked within 0° and 45° for the well azimuth and within 60° to 90°for the well inclination.

Keywords: in-situ horizontal stress; inversion method; well inclination; well azimuth; error.

Get the entire paper (pdf)    Go back to the TOC