Oil casing

Oil casing is the steel pipe used to support the wall of oil and gas well to ensure the normal operation of the whole oil well during and after drilling.Each well USES several layers of casing, depending on its depth and geology.Cement cementing should be adopted after casing drilling. It is different from tubing and drill pipe and cannot be reused. It is a disposable material.Therefore, the consumption of casing accounts for more than 70% of the total well pipe.

Casing can be divided into: pipe, surface casing, technical casing and oil casing according to the usage.

define

The special oil pipe is mainly used for drilling oil and gas Wells and transporting oil and gas.It includes oil drilling pipe, oil casing pipe and oil pumping pipe.Oil drill pipe is mainly used to connect drill collars and drill bits and transfer drilling power.Oil casing is mainly used to support the borehole wall during and after drilling to ensure the drilling process and the normal operation of the whole oil well after completion.The oil pipe mainly carries the oil and gas from the bottom of the well to the ground.

The oil casing is the lifeline to keep the well running.Due to the different geological conditions, the stress state in the underground is complex, and the comprehensive effects of tensile, compressive, bending and torsional stress on the pipe body put forward higher requirements for the quality of the casing itself.If the casing itself is damaged for some reason, the whole well may be reduced or even scrapped.

According to the strength of the steel itself, the casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc.Well conditions and depth are different, and steel grades are different.The casing itself is also required to have corrosion resistance in corrosive environment.Where the geological conditions are complex, the casing is required to have the anti-extrusion property.

use

Oil casing is a kind of large-caliber pipe material, which plays the role of fixing oil and gas oil well wall or hole.The casing is inserted into the hole and fixed with cement to prevent the hole from separating the rock from the hole from collapse and to ensure that the drilling mud is circulating for drilling.

Steel grades of oil sleeve: H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc.Pipe end processing: short round thread, long round thread, trapezoid thread, special button, etc.Oil well drilling is mainly used to support the borehole wall during and after drilling to ensure the drilling process and the normal operation of the whole oil well after completion.

The important position of petroleum pipeline

Petroleum industry is an industry that USES a large number of petroleum pipelines, which play an important role in the petroleum industry:

1. The consumption of petroleum pipe is large and the cost is large, which has great potential to save costs and reduce costs.The consumption of oil well pipe can be calculated according to the annual drilling footage.According to the specific situation in China, generally every 1m drilling requires 62kg of oil well pipe, including 48kg of casing and 10kg of tubing.Drill stem 3kg, drill collar 0.5kg;

2. The mechanical and environmental behavior of petroleum pipelines has an important impact on the adoption of advanced technology and the increase of production and efficiency in the petroleum industry.

3. The failure loss of the pipeline is huge, and its safety reliability and service life are of great importance to the petroleum industry.