Method for determining vertical well stratified fracturing crack lengths based on interlayer equilibrium displacement

US11702933B2 · kind B2 · utility

Assignees

• CHINA UNIVERSITY OF PETROLEUM (EAST CHINA) · CN
• Research Institute of Exploration and Development, Shengli Oilfield Branch, Sinopec · CN

Inventors

• Chuanzhi Cui · Qingdao, CN
• Zhongwei Wu · Taizhou City, CN
• Zhen Wang · Shanghai, CN
• Tongyu Yao · Qingdao, CN
• Chuanbao ZHANG · Dongying, CN
• Guangzhong LV · Dongying, CN
• Yongpeng Ren · Lo Wu, CN
• Gang Cao · Broomfield, US
• Xiaoduo Cui · Dongying, CN
• Bo Chen · Qingdao, CN

Key dates

• Filing date: Mar 17, 2020
• Grant date: Jul 18, 2023
• Expiry date: Sep 1, 2041

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B47/08
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

The invention discloses a method for determining vertical well stratified fracturing crack length based on interlayer equilibrium development. According to the method, interlayer equilibrium development can be achieved by determining the crack length of fracturing of each layer in the condition that an oil well meets the productivity requirements. The method comprises the following steps: 1) a threshold pressure gradient of each layer is determined; 2) a relationship chart of the crack half-length xf and the equivalent well diameter rwe is established; 3) daily oil production rate per unit thickness Qc meeting the production requirements is calculated; 4) the equivalent well diameter rwe of each layer is calculated according to the daily oil production rate Qc; and 5) the crack half-length xf of fracturing of each layer is calculated according to the equivalent well diameter rwe of each layer.