Numerical Simulation Study of Creeping Rock Formation in Jin X Fracture Block of Jingqiu Oilfield

Abstract

The Jin X fault block in Jing qiu Oilfield, as the main oil producing area of Huabei Oilfield.At present, there are a total of 141 wells drilled in this block, and 97 wells with damaged casing have been transformed;The casing transformation of wells has led to an increase in abandoned wells in this block, resulting in serious damage to the well network. The JinX fault block has a large number of damaged wells. The number of abandoned wells in this area has increased due to casing deformation, resulting in severe damage to the well network and high degree of casing damage. Among them,71 wells have been severely damaged due to casing deformation, such as scrapping, channeling, and pipe sticking, which have affected production, accounting for 73.2%. This has seriously affected the efficiency of oilfield production in the region.Previous statistics show that most of the casing deformation sections are in the paste salt formation, and the form of casing deformation and casing damage is mainly deformation. In order to investigate the mechanism of casing damage in the casing section, this paper establishes the creep equation of the casing layer in JinX block by conducting microstructure analysis of the casing layer and creep experiments in the casing layer, and then establishes a creep calculation model by using 3D numerical simulation technology, combining geological structure and well type conditions. The creep calculation model is then used to analyze the creep pattern under different conditions through simulation calculations, thus providing a reference for formulating effective casing loss prevention and control measures for the Jin X fault block.