Study on the Tribological Properties of Multilayer Concentric Hexagonal Laser Texturing on Rubber Surfaces of Screw Pumps

Author:

Liu Xinfu1ORCID,Niu Xinglong1ORCID,Liu Chunhua2,Shi Xiangzhi1ORCID,Sun Yi1,Hao Zhongxian3,Huang Shouzhi3,Wang Yuan4,Tao Hua4

Affiliation:

1. Key Lab of Industrial Fluid Energy Conservation and Pollution Control (Ministry of Education), Qingdao University of Technology, Qingdao 266520, China

2. College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China

3. Research Institute of Exploration & Development, PetroChina, Beijing 100083, China

4. Lusheng Petroleum Development Co., Ltd., China Petroleum & Chemical Corporation, Dongying 257077, China

Abstract

Given the friction and drag reduction effects observed in various biological hexagonal structures in nature, a new design was implemented on the rubber surface of the stator of a submersible screw pump. This design featured a multilayer concentric hexagonal groove structure. Furthermore, a composite multilayer hexagonal structure integrating grooves and pits was also developed and applied. This study investigated the influence of groove layer number, groove depth, pit depth, and multilayer hexagonal groove texture arrangement on the rubber surface flow characteristics. Additionally, the pressure field state, the degree of influence on the oil film-bearing capacity, and the biomimetic and hydrodynamic lubrication theories were tested using the finite element analysis method. Tribological experiments were conducted on nanosecond laser-processed rubber textures under simulated liquid lubrication conditions, reflecting actual shale oil well experiments. These experiments aimed to investigate the influence of multilayer hexagonal shape parameters on the tribological characteristics of the stator-rotor friction pair of a submersible screw pump. The results indicated that with a constant overall size, a multilayer hexagonal structure with ~0.1 mm groove depth enhanced the oil film-bearing capacity, providing significant friction and drag reduction. For composite textures, a deeper pit depth within the study area enhanced the oil film-bearing capacity. Furthermore, a gradient arrangement of groove textures featuring wider outer grooves and shallower depth exhibited superior performance in terms of bearing capacity.

Funder

National Natural Science Foundation of China

Taishan Scholar Project of Shandong Province

Shandong Provincial Plan for Introduction and Cultivation of Young Pioneers in Colleges and Universities

Natural Science Foundation of Shandong Province

Project of CNOOC Research Institute Ltd.

Publisher

MDPI AG

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