公开(公告)号：US20190330519A1

公开(公告)日：2019-10-31

申请号：US16254773

申请日：2019-01-23

Applicant: PetroChina Company Limited

Inventor： Lijun MU ,  Xianwen LI ,  Hongjun LU ,  Yong WANG ,  Bin YAO ,  Zhenning JI ,  Suiwang ZHANG ,  Xiaobing LU ,  Zhiying DENG ,  Lei SUI ,  Erzhen WANG ,  Zhaojie SONG

IPC: C09K8/72 ,  E21B43/25

Abstract: The present invention provides a chelating agent for reservoir acidification and stimulating injection and its preparation method and application. The raw material composition of the chelating agent comprises: 10.0%-20.0% of methanesulfonic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of polyaspartic acid, 10.0%-15.0% of epoxy succinic acid, 5.0%-10.0% of sodium cetyl sulfonate, 10.0%-15.0% of cetyltrimethylammonium bromide and the balance of water. The present invention also provides a preparation method of the above chelating agent. The chelating agent for reservoir acidification and stimulating injection of the invention is used in an acidizing and stimulating injection process, wherein it can effectively dissolve rock cracks, be used directly without need to be reversed.

公开(公告)号：US20190242226A1

公开(公告)日：2019-08-08

申请号：US16175620

申请日：2018-10-30

Applicant: PetroChina Company Limited

Inventor： Lingzhi YANG ,  Yafeng JU ,  Bin YAO ,  Jiuzheng YU ,  Bilin LUO ,  Fuwei BI ,  Zijian WANG ,  Yanqing LIU

IPC: E21B43/20

CPC classification number: E21B43/20

Abstract: A layered water injection system and a layered water injection method. The system comprises: a ground water injection valve group configured with an intelligent control valve, for receiving a water injection control instruction sent by a remote control center, and for converting the water injection control instruction into a switching action of the intelligent control valve to control water flow pressure fluctuation in a water injection string, so as to form a first pressure wave code in the water injection string; a water distributor for collecting the first pressure wave code, interpreting the first pressure wave code as a corresponding water outlet switch instruction, and performing layered water injection control according to the water outlet switch instruction. The embodiments of the application can improve the automation level of layered water injection and the reliability of layered water injection control.