SSAW Pipe

　　27MnCrV is a new type of steel used in the production of TP110T steel grade casing pipe sleeves. The steel types used in conventional production of TP110T steel grade oil pipe sleeves are 29CrMo44 and 26CrMo4. Compared with the latter two, 27MnCrV contains less Mo, which can greatly reduce production costs. However, after the 27MnCrV is produced by the normal austenitizing quenching process, there is obvious high temperature tempering brittleness, which results in low impact toughness and instability. 　　To solve such problems, two methods are usually used to deal with them. First, rapid cooling after tempering is used to avoid high temperature brittleness and obtain toughness. The second is the sub-temperature hardening method through the incomplete austenitization of steel to effectively improve harmful elements and impurities, and improve toughness. The first method has relatively strict requirements on heat treatment equipment and requires additional costs. 　　27MnCrV steel ha...

　　The casing pipe coupling is a kind of oilfield drilling tool, which is mainly used for the connection of the oil pipe, and mainly solves the problem that the existing coupling easily generates fatigue fracture due to stress concentration. 　　The tubing coupling structure is: the tubing end is connected to the inner wall of the coupling by a taper thread, and the end of the coupling body and the oil pipe are connected by the same thread with the pitch flat thread. The utility model has the characteristics of alleviating the stress concentration of the root of the external thread of the single taper thread connection tubing, is not easy to produce fatigue fracture, and has good connection effect. Effectively prevent oil well pipe string breakage accidents. 　　The coupling is divided into a tubing coupling and a casing coupling. Commonly used steel grades are J55, K55, N80, L80, P110 and so on. 　　Main buckle type: NU (not thickened), EU (thickened), TBG (not thickened), UP-TBG (thic...

　　Hydrostatic pressure test is an indispensable part in the manufacturing process of steel pipe. Its function is to detect the anti-leakage function of steel pipe under the standard test pressure and steady voltage. It is the same as the flaw detection process of ray and ultrasonic, and is an important means to check the overall quality of steel pipes. So what are the regulations for the hydrostatic test of the casing pipe? The following is simple for everyone: 　　1. The hydrostatic test pressure value of the coupling and threaded pipe is the lowest value of the hydrostatic test pressure of the flat end pipe, the maximum hydrostatic pressure test pressure of the coupling, and the internal pressure leakage resistance, but the maximum pressure is 69 MPa, and 　　the calculation pressure is The value is usually rounded to the nearest 0.5 MPa. 　　2. According to the API requirements, the hydrostatic pressure test pressure measuring device should be calibrated within 4 months before each ...

　 　Uses of Welded pipe 　　1. General welded pipes are used for the transportation of generally lower pressure fluids such as water, gas, air, oil and heating steam. 　　2. Ordinary carbon steel wire casing pipe (GB3640-88) is a steel pipe used to protect electric wires in electrical installation projects such as industrial and civil construction, installation machinery and equipment. 　　3. Straight seam welded pipe (YB242-63) is a steel pipe whose weld is parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded pipe, welded thin-walled pipe, transformer cooling oil pipe and so on. 　　4. Spiral-slit submerged arc welded pipe (SY5036-83) for pressurized fluid conveying is a hot-rolled steel strip coil for tube blank, which is often spiral-formed by a double-sided submerged arc welding method for spiral conveying of pressurized fluid. Seam steel pipe. The steel pipe has strong pressure bearing capacity and good welding performance. It is saf...

　　In order to maintain a stable heat treatment product during the induction heat rapid heat treatment process, the following measures should be taken on the production line: 　　(1) The casing plant adopts the technology of continuous heating of steel bridges and uses bridging technology to improve the phenomenon of low steel temperature and increase steel production. A computer is used to control the head and tail of the steel; dual-frequency power is used to control the temperature at the end of the steel pipe ; rotary joints are used to achieve great progress, etc. to increase the longitudinal temperature uniformity of the steel. 　　(2) Advanced steel conveyors are used to ensure uniform steel speeds. Steel tubes and large bars should rotate at a constant speed. The transmission mechanism should use variable frequency drive to improve the stability and reliability of the mechanism. This is one of the important conditions for ensuring that the longitudinal temperature of the phase m...

　　The API 5CT standard covers seamless and welded casing and tubing pipes for oil and gas transportation. Casing pipes are available in the following materials: H-40, J-55, K-55, N-80, L-80, C-90,T-95 ,P-110, Q-125. 　　Depending on the different condition and depth of the well, we use the different steel grades. The casing is required anti-corrosion under the corrosive environment. In the case of complex geological conditions, the casing has to be resistant to collapse. Most casing steel grades have the same chemical composition. What makes grade different is the heat treatment applied. Casing grades mainly differ in their yield strength, tensile strength, and hardness. 　　According to API 5CT, there are four groups of products to API SPEC 5CT is applicable include the following grades of pipe: 　　Group 1: Grades H, J, K,M, N and R; 　　Group 2: Grades C, L and T; 　　Group 3: Grade P; 　　Group 4: Grade Q. 　　Additional tests required by API 5CT for certain groups of casing make s...

    The casing pipe coupling is the necessary workpiece for connecting the two tubing sleeves. Manufacturing methods is the same as seamless pipe , the domestic use of j55, n80Q and other special steel manufacturing. The ends of the steel pipe have internal threads for connection to the upper and lower tubing. In order to ensure the sealing of the joint, the thread precision has more stringent requirements.     First, use     Used to connect the upper and lower tubing.     Second, the type     Domestic casing pipe is divided into non-thickening casing pipe coupling and thicker oil casing at both ends of the collar.     Third, the processing process     Car end face - car outer circle - boring - car thread - inspection - phosphating

    N80 steel pipe is generally casing pipe. N80 casing pipe is an important equipment for oil drilling, and its main equipment also includes drill pipe, core tube and casing, drill collar and small diameter drilling steel pipe.     Domestic casing to geological drilling steel by hot-rolled or cold drawn, steel with "geological" (DZ) said that the commonly used casing steel DZ40, DZ55, DZ753 species.     (1) Casing pipe mainly imported countries: Germany, Japan, Romania, Czech Republic, Italy, Britain, Austria, Switzerland, the United States, Argentina, Singapore also imports. Import standard reference to the American Petroleum Institute Standard API5A, 5AX, 5AC. Steel grade is H-40, J-55, N-80, P-110, C-75, C-95 and so on. Specifications for the main 139.77.72R2,177.89.19R-2,244.58.94R-2,244.510.03R-2,244.511.05R-2.     (2) API provides a length of three: R-1 is 4.88 ~ 7.62m, R-2 is 7.62 ~ 10.36m, R-3 is 10.36m to longer.     (...

    Casing pipe with a total of H40, J55, K55, M65, N80, L80, C90, T95, C95, P110, Q125 more than twenty different steel grade and type. In order to distinguish between different grade of steel strength, thread type, respectively, with different color code and symbols represent represent steel grade and thread.     Color label and english letters at the back of the 2 or 3 digits said the minimum yield strength steel grade oil casing, such as J55 said its minimum yield strength of 55000 pounds per inch (379 mpa) up to 80000 pounds per inch (552 mpa), 2 P110 minimum yield strength of 110000 pounds per inch (758 mpa) up to 140000 pounds per inch 2 (965 mpa).H, J, K, N for general strength oil bushing, C, L, M, T for qualified yield strength oil bushing, which has certain anti-sulfur corrosion resistance.