Something about Casing
Date:2024-04-18
Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.
Casing can be divided into: conduit, surface casing, technical casing and oil layer casing according to the usage.
Oil casing is the lifeline to keep oil well running. Due to the different geological conditions, the downhole stress state is complex, and the combined effects of tension, compression, bending and torsional stress act on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well, or even scrap it.
The importance of oil pipelines
The petroleum industry is an industry that uses petroleum pipes in large quantities, and petroleum pipes play an important role in the petroleum industry:
1. Petroleum pipes are used in a large amount and cost a lot, so there is great potential for saving expenses and reducing costs. The consumption of oil well pipes can be calculated according to the annual drilling feet. According to the specific conditions of our country, generally 62kg of oil well pipes are required for every 1m of drilling, including 48kg of casing and 10kg of oil pipe. Drill pipe 3kg, drill collar 0.5kg;
2. The mechanical and environmental behavior of oil pipes have an important impact on the adoption of advanced technology and increase in production and efficiency in the oil industry;
3. The failure of oil pipes will cause huge losses, and its safety, reliability and service life are of great importance to the oil industry.
