Different types of oil pipeline are used in the process of oil production: surface oil pipeline protects the drilling from shallow water and gas layers, supports wellhead equipment and maintains the weight of other layers of oil pipeline. Technical oil pipeline separates different layers of pressure, so as to ensure the normal circulation of drilling fluid quota and protect the production casing. In order to install anti burst device, leak proof device and liner in the well. The oil-bearing oil pipeline carries oil and gas out of the reservoir below the surface. Used to protect the well and separate the drilling mud. In the production of oil casing, the outer diameter is usually 114.3 mm to 508 mm.
Oil pipeline is a necessary pipe material for drilling oil and gas, and it should have good performance in use. Different temperature control is used in different temperature section of oil pipeline, and heating needs to be carried out according to certain temperature. AC1 = 736 ℃, AC3 = 810 ℃ of 27MnCrV steel, tempering temperature is 630 ℃ after quenching, tempering heating holding time is 50min. The heating temperature is 740-810 ℃. The subcritical quenching temperature is 780 ℃ and the holding time is 15min. Because the intercritical quenching is heated in the α + γ two-phase region, the toughness can be improved while keeping the temperature.
Oil pipeline is used to support the well wall of oil and gas wells to ensure the normal operation of the whole well during the drilling process and after completion. According to different drilling depth and geological conditions, several layers of casing should be used in each well. Cement cementing should be used after casing is put into the well. It is different from tubing and oil pipeline, so it can not be reused and belongs to disposable consumption material. Therefore, casing consumption accounts for more than 70% of the total oil well tubing. The casing can be divided into three types according to the service conditions: casing, surface casing, technical casing and oil casing.
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