Oil casing is a steel Pipe used to support the wall of oil and gas Wells to ensure the normal operation of the drilling process and the entire well after completion. Each well uses several layers of casing depending on the drilling depth and geology. Casing after the well to use cement, it is different from Tubing, drill pipe, can not be reused, belongs to a one-time consumption of materials. Therefore, casing consumption accounts for more than 70 percent of the total oil well pipe. Casing can be divided into pipe, surface casing, technical casing and oil casing according to the use. The welded pipe has two kinds of ordinary oil casing and thickened oil casing according to the specified wall thickness.

Different types of casing used in oil production: Surface oil casing protects the well from contamination by shallow water and gas layers, supports wellhead equipment and maintains other layers of casing weight. Technology Oil casing separates the pressure at different levels to allow the normal flow of drilling fluid and protect the production casing. In order to install anti-burst device, anti-leakage device and liner in the drilling rig. Oil casing carries oil and natural gas from a reservoir beneath the earth’s surface. Used to protect drilling and layer drilling mud. When oil casing is produced, the outer diameter is usually 114.3 mm to 508 mm.

J55 oil casing is a necessary pipe for drilling oil and natural gas, and it must have good performance in use. Oil casing in different temperature segments choose different temperature control, heating needs to be in accordance with a certain temperature production, 27MnCrV steel AC1=736℃, AC3=810℃, tempering temperature selected after quenching 630℃, tempering heating and holding time 50min. The heating temperature of subtemperature quenching is selected between 740 and 810℃. The heating temperature of subtemperature quenching is 780℃, and the holding time of quenching heating is 15min. Because the subtemperature quenching is heated in the α+γ two-phase zone, the quenching is carried out while retaining part of the undissolved ferrite state, and the toughness can be improved while maintaining the temperature.

Oil casing is a steel pipe used to support the wall of oil and gas Wells to ensure the normal operation of the drilling process and the entire well after completion. Each well uses several layers of casing depending on the drilling depth and geology. Casing after the well to use cement, it is different from tubing, drill pipe, can not be reused, belongs to a one-time consumption of materials. Therefore, casing consumption accounts for more than 70 percent of the total oil well pipe. Casing can be divided into pipe, surface casing, technical casing and oil casing according to the use.

Oil casing is the lifeline of oil well operation. Due to different geological conditions, the underground stress state is complicated, tensile, compressive, 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, the entire 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 and so on. Different well conditions, well depth, the use of steel grades are also different. In the corrosive environment, the casing itself is also required to have corrosion resistance. In the place of complex geological conditions, it is also required that the casing has anti-crushing performance and anti-microbial erosion.

The special oil pipe is mainly used for the drilling of oil and gas Wells and the transportation of oil and gas. The utility model includes oil drilling pipe, oil casing and oil pumping pipe. Oil drill pipe is mainly used to connect the drill collar to the drill bit and transfer drilling power. Oil casing is mainly used to support the well wall during drilling and after well completion, so as to ensure the drilling process and the normal operation of the whole well after well completion. Suction tubing mainly carries oil and gas from the bottom of the well to the surface.

A defect of depth not extending below the taper of the bottom diameter of the thread or greater than 12.5 percent of the specified wall thickness (whichever is greater) is permitted between the length of the L C and the point of disappearance of the thread, but no corrosion products are permitted on the surface of the thread. Grinding finishing is allowed to eliminate defects, but filing is not allowed to eliminate pits. The outer chamfer of the pipe end (65°) is guaranteed to be complete on the 360° circumference of the pipe end, and the chamfer diameter should make the root of the thread disappear on the chamfer surface rather than on the pipe end face, and there is no edge like edge. The outer chamfer of the tube end is 65°~70°; The inner chamfer of the pipe end should be 360° full round chamfer, and the inner chamfer should be 40°~50°. If there is any part that is not poured on, manually file out the chamfer.

Oil casing is a kind of large diameter pipe, which plays the role of fixing the wall or hole of oil and gas oil. Casing is inserted into the well hole and secured with cement to prevent the rock formation separating the hole and the hole from collapsing, and to ensure the circulation of drilling mud to facilitate drilling and production. Steel grade of oil casing: H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Casing end processing forms: short round thread, long round thread, partial trapezoid thread, special buckle, etc. It is mainly used to support the well wall during the drilling process and after the completion of the well, so as to ensure the normal operation of the drilling process and the entire well after the completion.

The petroleum industry is a large number of the use of petroleum pipeline industry, petroleum pipeline in the petroleum industry occupies a very important position: the amount of petroleum pipeline is large, the cost is much, the potential to save expenses and reduce costs is huge. The consumption of oil well pipe can be calculated by the number of feet drilled per year. According to the specific situation of our country, in general every 1m drilling requires 62kg of oil well pipe, of which 48kg casing, 10kg tubing. A blind groove of the same size as the slit is etched into the inner wall of the pipe. Drill pipe 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 efficiency in the petroleum industry; 3 Oil pipe failure loss is huge, reliability and oil life is of great importance to the oil industry. [(outer diameter – wall thickness)* Wall thickness]*0.02466=kg/ meter (weight per meter).

Different well conditions, well depth, the use of steel grades are also different. In the corrosive environment, the casing itself is also required to have corrosion resistance.  API seamless steel pipe in the geological conditions of complex places also require the casing to have a crush resistance. Suction tubing mainly carries oil and gas from the bottom of the well to the surface. Threaded connection form: short round thread casing (STC); Long round thread casing (LTC) Partial trapezoidal thread casing (BTC); Straight-connected casing (XC) unthickened tubing (NU); External thickened tubing (EU); Integral connector tubing (IJ).

API 5CT oil casing,API 5L oil pipeline pipe standard,API 5CT oil casing,API 5L oil pipeline pipe standard, oil casing is made of seamless steel pipe, electric welded steel pipe and hot rolled steel pipe as raw materials, by CNC wire turning. The coupling adopts the international advanced high temperature phosphating process of pure manganese series. The phosphating film has strong binding force, uniform and dense crystallization, high hardness, corrosion resistance and adhesion resistance. The products have been inspected by Xi ‘an Petroleum Pipe Research Institute, and the performance indicators are in line with the standard technical requirements. ASTM steel pipe can be divided into different steel grades according to the strength of the steel itself, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150 and so on.

J55 oil casing, K55 oil casing, N80 oil casing, P110 oil casing, side ladder oil casing, long round oil casing, short round oil casing, J55 side ladder oil casing, J55 long round oil casing, J55 short round oil casing, K55 side ladder oil casing, K55 long round oil casing, K55 short round oil casing Casing, N80 side ladder oil casing, N80 long round buckle oil casing, N80 short round buckle oil casing, P110 side ladder oil casing, P110 long round buckle oil casing, P110 short round buckle STC oil casing, API5CTSTC long round buckle LTC oil casing, API5CT Long round buckle BT C Oil casing, long round thread J55 oil casing, long round thread K55 oil casing, long round thread N80 oil casing, long round thread P110 oil casing, short round thread J55 oil casing, short round thread K55 oil casing, short round thread N80 oil casing, short round thread P110 oil casing, side ladder thread J55 Oil casing, deviated ladder thread K55 oil casing, deviated ladder thread N80 oil casing, deviated ladder thread P110 oil casing, straight connection type J55 oil casing, straight connection type K55 oil casing, straight connection type N80 oil casing, straight connection type P110 oil casing with casing instead of drill rod to apply torque and bit weight, Realize bit rotation and drilling. The whole drilling process no longer uses drill pipe, drill collar, etc. The drill bit is the use of wire rope fishing, in the casing to achieve the drill bit lifting, that is, to achieve the replacement of drill bit drilling tools, reduce the trip and blowout, stuck and other accidents, improve the drilling reliability, reduce the cost.

Similar Posts