Oil casing is a new product of Haokun flanges. Oil casing belongs to flanges related products. Flanges enterprises are more dominant in producing oil casing.
Oil casing is mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipe, oil pipe and oil extraction pipe. Petroleum drill pipe is mainly used to connect drill collar and bit to transmit drilling power. Oil casing is mainly used to support the well wall during and after well completion, so as to facilitate the normal operation of the whole oil well during and after well completion. The oil casing mainly transports the oil and gas at the bottom of the oil well to the surface. Oil casing is the lifeline of oil well operation. Due to different geological conditions and complex underground stress state, tensile, compressive, bending and torsional stresses act on the pipe body, which puts forward higher requirements for casing quality. Once the casing itself is damaged for some reason, the production of the whole well may be reduced or even scrapped.
According to the strength of steel itself, oil casing can be divided into different steel types, namely J55, K55, N80, L80, C90, T95, P110, q125, V150, etc. Different steel grades are used for different well conditions and well depths. In corrosive environment, the shell itself is required to have corrosion resistance. In places with complex geological conditions, the casing is required to have anti collapse ability. 27MnCrV is a new steel for producing tp110t oil pipe sleeve, and the conventional steel for producing tp110t oil pipe sleeve is 29crmo44 and 26crmo4. Compared with the latter two, 27MnCrV contains less Mo, which can effectively reduce the production cost. However, after 27MnCrV is produced by conventional quenching process, there is obvious high-temperature tempering brittleness, resulting in low impact toughness and instability. There are usually two methods to solve this kind of problem in production. One is to avoid high-temperature brittleness and obtain toughness by rapid cooling after tempering. Secondly, the sub temperature quenching method can effectively improve the harmful elements and impurities and improve the toughness through the incomplete austenitization of the steel grade. This method has strict requirements for heat treatment equipment and needs to increase additional cost. AC1 = 736, AC3 = 810, the heating temperature during sub temperature quenching is 740-810. The heating temperature is 780 and the quenching holding time is 15 minutes. The tempering temperature after quenching is 630, and the tempering heating holding time is 50 minutes. Because the sub temperature quenching is heated in the two-phase region, the quenching is carried out in the state of retaining some undissolved ferrite. While maintaining a high degree, the toughness is improved. At the same time, the low-temperature quenching is lower than the conventional temperature, which reduces the quenching stress, reduces the quenching deformation, ensures the smooth progress of heat treatment production, and provides good raw materials for subsequent turning. The process has been applied in the processing plant. The quality data show that the yield strength rt0.6, tensile strength RM 910-940mpa and impact toughness Akv 65-85j of the steel pipe after heat treatment meet the damage resistance requirements.
The data show that 27MnCrV steel pipe is a kind of oil casing. On the other hand, it also shows that sub temperature quenching process is a method to avoid high temperature brittleness in iron and steel production. Oil casing is a kind of large diameter pipeline, which can fix the well wall or borehole of oil and gas well. The casing is inserted into the borehole and fixed with cement, which helps to layer the borehole and prevent the borehole from collapsing. At the same time, the drilling mud circulates to facilitate drilling and production. Oil casing steel types include: H40, J55, K55, N80, L80, C90, T95, P110, q125, V150, etc. The processing forms of casing head include: short round thread, long round thread, trapezoidal thread, special buckle, etc. It is used for oil well drilling, mainly for supporting the well wall during and after well completion, so as to ensure the normal operation of the whole oil well during and after well completion. The important position of oil pipeline the petroleum industry is an industry that uses a large number of oil pipes, and oil pipes play a very important role in the petroleum industry. The consumption of oil well pipe can be calculated according to the annual drilling footage. The mechanical and environmental behavior of oil pipelines has an important impact on the adoption of technology and the improvement of production and efficiency in the oil industry.
