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1 Structure and working principle Rotating drum vibrating screen mainly consists of rotating cylinder body, supporting transmission device, vibration base and fixed base. The rotating cylinder with holes is mounted on the vibrating base through the supporting rolling wheels at both ends, and the fine mesh is uniformly spliced ​​and fixed at the periphery of the cylinder. A large ring gear is arranged at one end of the rotating cylinder, and a through shaft is arranged on the vibration base corresponding to the ring gear, and the through shaft is driven by the motor. A driving pinion on the through shaft drives the large ring gear and the drum to rotate, and a polarizing block is mounted on the through shaft. The vibrating base is mounted on the fixed base by a spring, and the vibrating base and the cylinder are inclined toward the outlet end. Under the action of the spring and the polarizing block, the rotating cylinder and the mud are accompanied by vibration and rolling while rotating (Fig. 1). 
A hole is uniformly distributed on the cylindrical cylinder, and a stainless steel fine mesh having a certain geometric shape is uniformly spliced ​​and fixed on the periphery of the cylindrical body. On the periphery of the upper inlet end of the cylinder, a large ring gear of the drum is riveted, welded or bolted, and the teeth mesh with the driving pinion. The outer ends of the cylinder are respectively welded to support the rolling track, and they support the drum on the four supporting rolling wheels. The upper and lower ends of the cylinder are respectively welded with an inlet and an outlet, and the inlet of the upper end is connected with the diversion trough, and the lower end is an outlet of the solid phase impurities such as sand and stone of the mud. Four vibration springs are fixed under the vibration base and connected to the fixed base. When the motor on the vibrating base rotates, the drive pulley is driven to rotate the through shaft, the driving pinion, the four supporting rolling wheels and the polarizing block. Since the large ring gear of the drum on the rotating cylinder meshes with the driving pinion, the cylinder and the mud therein are also rotated. Under the action of the polarizing block, the cylinder is vibrated at a certain frequency. The mud enters the rotating cylinder from the diversion trough. Since the inclination of the cylinder itself has a downward trend, the mud is rolled, vibrated and rotated in the cylinder, and the filtration through the vibrating fine screen is combined in several kinds of sports forces. Flowing down into the mud tank, the solid phase impurities roll along the slope of the cylinder 4 to the outlet.
2 Field test a) Since the variable plane screen is a rotating cylinder type and a fine screen is used, the mud rotates in the drum accompanied by rolling and vibration, so the mud can be well treated and the sand removing effect can be improved.
b) The rotating cylinder rotates with the motor, and the rotation speed is even and stable. In particular, the screen mesh is made of small pieces of geometric shape made of stainless steel material, and the screen mesh is changed from single-sided use to multi-faceted use, thus extending the screen. The life of the net.
c) If the screen is damaged, only the damaged part needs to be replaced, no need to replace the whole piece, the operation is simple, the number of replacements and time is reduced, thereby improving the drilling time and reducing the production cost.
d) The sand removal effect is improved, and the solid phase impurity content in the mud is small, which directly protects and prolongs the service life of the mud pump and reduces the consumption of the mud pump wearing parts.
e) The noise during the field test is large, mainly due to insufficient processing, manufacturing, assembly precision, improper adjustment, and unreasonable matching.
3 Conclusion Rotating drum vibrating screen has significant advantages over traditional vibrating screen, but it also has the disadvantages of high manufacturing cost and high noise. It needs to be continuously improved and improved. In the process of manufacture and use, the shape of the cylinder can be further changed. The diameter of the cylinder, the length of the cylinder, the inclination, etc., can also change the rotational speed of the cylinder. The number of holes in the cylinder, the shape of the hole, and the geometry and fineness of the control screen can be matched to produce a series of products; the drilling production site can increase the density of the screen while increasing the rotation speed of the cylinder, and can replace Sand removal cleaners, sand removal pumps and centrifuges, etc., to achieve a multi-purpose effect.
(Author: blue East China Sea, Zhang Peng, JIANG Jian-hua, Liu Xiang)
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Introduction to the development of rotating drum vibrating screen (drum screen)
At present, in the exploration and development drilling of oil and natural gas at home and abroad, most of the mud treatment devices used are vibrating screens, which are constructed by fixing a sieve bed on the base, and a sieve shaft and a screen with an eccentric block on the sieve bed. The drive shaft is driven by the motor to make the sieve bed vibrate as a semi-elliptical trajectory dominated by the above. The screens are mostly flat with a convex surface. The vibrating screen is easy to run mud; the screen is easy to accumulate sand, stone and other solid phase impurities, so the screen is vulnerable to mechanical or man-made damage, and the service life is short; when the damaged area of ​​the screen accounts for 10% to 20%, most of the whole replacement Not only the on-site operation is troublesome, but also causes great waste; the vibrating screen mainly composed of linear and plane vibrations affects the sand removing effect of the mud to a certain extent.