Roller type water injection well centering device

A roller type water injection well centering device relates to a water injection well centering device. The invention aims to solve the problems that the existing nylon centering device and spring leaf centering device have large contact surface and friction force with the inner wall of the tubing string and the roller centering device has long axial length so as to influence the installation of instruments in the tube. The main body of the centering device comprises a cross sliding plate and two bolt heads which are integrated together, wherein each arm of the cross sliding plate is providedwith an installation slot, the long holes on the two side walls are the same and opposite, the bottom surface of each installation slot is provided with a first blind hole, a roller is arranged in a roller slot, the roller is connected with a slide block through a long pin, one roller component is arranged in each installation slot on the cross sliding plate, the two ends of the long pin of the roller component separately penetrate through the corresponding long hole, and a compressed spring is arranged between each first blind hole and each second blind hole. The invention is used for centering the testing instrument and the inner wall of the water injection well when the oilfield water injection well is tested.