China University of Petroleum

Beijing Institute of Technology

Ninebot Tech. Co., Ltd

Haiyang Liu

Li Li Zhao

Guancheng Jiang

Xiao Dong Li

Lili Yang

Yinbo He

Chunguang Xu

Jun Guo

Jingping Liu

Xianbin Huang

Zichong Chen

Tengfei Dong

Weining Xi

Xuwu Luo

Yubin Yuan

Zhongyuan Chen

Dingguo Xiao

Jingen Deng

Lang Xu

Qinxue Pan

Wentao Song

Xiaoqing Li

Wuquan Li

Fuhua Wang

Luyi Wang

Weidong Zhang

Haitao Zhu

Zezhuang Sun

Zhihao Zhang

Zhizun Wang

Dunyuan Yu

Yang Wang

A ternary water control and gas recovery method suitable for an unconsolidated siltstone gas reservoir is provided. It includes the following steps: first, running a silt control screen pipe manufactured by an interface hydrophobic modification into a wellbore to realize wellbore water control and silt control; second, filling a surface hydrophobic modified gravel in an annular space between the silt control screen pipe and the wellbore to form a hydrophobic gravel packing layer for water control and silt control; third, injecting a wetting agent aqueous solution into a stratum, and performing a hydrophobic modification on a gas reservoir seepage channel surface to realize in-situ waterblocking and silt migration of the unconsolidated siltstone gas reservoir, and then closing a well for a preset time before exploitation.

Ternary water control and gas recovery method suitable for unconsolidated siltstone gas reservoir

The invention discloses a calcium-resistant zwitterionic polymer, a preparation method and an application thereof, and a water-based drilling fluid containing the polymer as a dispersing agent, wherein the polymer contains a structural unit A, a structural unit B and a structural unit C, and the structural unit A is at least one selected from the group consisting of structural units with a structure shown in a formula (11), a structure shown in a formula (12) and a structure shown in a formula (13); the structural unit B is a structural unit with a structure shown in a formula (2); the structural unit C is at least one selected from the group consisting of structural units having a structure represented by formula (31) and a structure represented by formula (32); the weight-average molecular weight of the polymer is 350,000 to 600,000. 

Calcium-resistant zwitterionic polymer, preparation method and application thereof, and water-based drilling fluid containing polymer as dispersant

A sensor device, comprising two symmetrically disposed sonolucent wedges (), and a connecting piece for fixedly connecting the two sonolucent wedges (); the upper surfaces of the sonolucent wedges () are provided with inclined planes; installation holes are formed on the inclined planes; transducers () are installed in respective installation holes; one transducer () is used to generate ultrasonic waves, and the other transducer () is used to receive the ultrasonic waves generated by the previous transducer (). The residual stress detection system comprises a sensor device, an ultrasonic transmission card, and a data acquisition card.

Sensor device and residual stress detection system employing same

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Beijing, China

Haiyang Liu