Patents by Inventor Chuanbao ZHANG

Chuanbao ZHANG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240368459
    Abstract: A guar gum fracturing fluid gel and a guar gum fracturing fluid system with reduced pH dependence, a preparation method and an application thereof are disclosed. The fracturing fluid gel includes 0.01-0.2% of nanomaterial, 0.1-0.5% of guar gum, 0.1-0.5% of organic boron-titanium crosslinker and a remaining amount of water. The fracturing fluid gel is more stable in network structure, tolerant of different temperatures and has good shear resistance. A preparation method and an application of the fracturing fluid gel are also provided. In the guar gum fracturing fluid system, the dependence on pH level is reduced, thereby alleviating the damage caused by a high pH value to a reservoir.
    Type: Application
    Filed: July 28, 2022
    Publication date: November 7, 2024
    Applicant: CHINA UNIVERSITY OF PETROLEUM, EAST CHINA
    Inventors: Yanling WANG, Chuanbao ZHANG, Lei LIANG, Bin LIU, Longhao TANG, Jincheng GONG, Ning XU
  • Patent number: 11702933
    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.
    Type: Grant
    Filed: March 17, 2020
    Date of Patent: July 18, 2023
    Assignees: China University of Petroleum (East China), Research Institute of Exploration and Development, Shengli Oilfield Branch, Sinopec
    Inventors: Chuanzhi Cui, Zhongwei Wu, Zhen Wang, Tongyu Yao, Chuanbao Zhang, Guangzhong Lv, Yongpeng Ren, Gang Cao, Xiaoduo Cui, Bo Chen
  • Publication number: 20200392842
    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.
    Type: Application
    Filed: March 17, 2020
    Publication date: December 17, 2020
    Inventors: Chuanzhi CUI, Zhongwei WU, Zhen WANG, Tongyu YAO, Chuanbao ZHANG, Guangzhong LV, Yongpeng REN, Gang CAO, Xiaoduo CUI, Bo CHEN