Underground drilling, the casing diameter is greater than the diameter of the casing annulus formed outside the area designated in the air within the outer casing, injection cement or other cementing material filling process is called, specifically through the casing the slurry into the bottom, into the casing and the annulus between the wall until it reaches the design height. The purpose of cementing the casing and the wall of the annular space cementing together to packer-gas-water layer, leading oil and gas wells the casing into the channel. Cementing process requires installation of the bottom casing string downhole cementing equipment vibration, vibration of the slurry to ensure that cement its dense and filling the depression on the real wall.
Cementing downhole vibration vibrator aims to overcome the problems of existing technologies to provide a downhole cementing equipment vibration, both the axial vibration, and can produce radial vibration, the vibration to good effect.
To solve the above technical problems, cementing downhole vibration of a vibrator provided by cementing downhole vibration devices, including cylinder and is located in the cylinder body vibration device, described with the cylinder ends were connected in series with the casing collar The connecting thread, as described in the vibration device includes mandrel, trays, and the eccentric screw, installed in the above described screw mandrel, and a total of four paragraphs, two of which have welded the screw described in peripheral eccentric; adjacent ends of two between the screw and mandrel trays are installed above, in order from the above mentioned pivot bearing through the hole in the center of the tray, the trays described above the center hole and mandrel with intermittent, as described in the outer circumference of the bearing tray fixed above the cylinder wall, above the end face of trays with holes through the diversion.
Relative to existing technology, cementing downhole vibration vibrator made the following beneficial effects: vibration device installed in the casing cementing the bottom, high-pressure fluid to enter from the bottom of the tube, outflow from the upper cylinder, the fluid flow process in in promoting the screw rotation, screw driven eccentric rotation, an effect in the casing column of the periodic load, cyclic loading in the casing under the effect of vibration, the vibration waves pass from the bottom up, and then in the formation of the annular space vibration wave field, in order to improve cementing quality.
Downhole vibration vibrator cementing the preferred option, not mentioned eccentric located adjacent to the two screw.
Downhole vibration vibrator further cementing the preferred solution, bearing trays of diversion described as the slant-hole hole, inclined holes described above tilt direction and angle of the screw blades rise the same direction. Diversion holes for the slant-hole, and the rise angle of the blade with the screw direction, can reduce the fluid resistance.
As a further optimization of the utility model program, as described in trays with the outer circumference of the central groove extending along the circumferential surface, tighten the screws through the wall of the circumference of the cylinder described in trays of stretching will be described in the groove trays fixed. Multiple fastening screw screwed into the cylinder from all directions, the ends of the screw embedded in the groove trays, trays to be fixed.
As a further optimization of the utility model program, as described by the multi-segment concatenation of the mandrel, each mandrel at both ends are connected to each other with male and female connectors. This structure makes it more convenient for processing and installation.