Oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure that the drilling process is carried out and that the entire well operates normally after completion. Several layers of casing are used in each well according to different drilling depths and geological conditions. The casing is cemented after the well is drilled, and unlike tubing and drill pipe, it is not reusable and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70 percent of all oil well tubing. Casing can be divided into: conduit, surface casing, technical casing and oil layer casing according to usage. There are two types of welded pipe according to the specified wall thickness: ordinary oil casing and thickened oil casing.

Different types of casing used in the oil extraction process: surface petroleum casing protects the drilling well from contamination by shallow water and shallow gas formations, supports the wellhead equipment and maintains the weight of other layers of the casing. Technical oil casing separates the pressure in the different layers to allow proper flow of drilling fluid amounts and to protect the production casing. Enables installation of anti-storm fracture devices, leak prevention devices and tail pipes in drilled wells. Oil Formation Oil casing to move oil and gas out of the reservoir below the surface. It is used to protect the drilling well by layering the drilling mud. Oil casing is typically manufactured with an outside diameter of 114.3 mm to 508 mm.

J55 oil casing is a necessary pipe for drilling oil and gas and needs to have good performance in use. Petroleum casing in different temperature sections selected different temperature control, heating needs to be produced in accordance with a certain temperature, 27MnCrV steel AC1 = 736 ℃, AC3 = 810 ℃, tempering after quenching selected temperature 630 ℃, tempering heating holding time of 50 min. sub-temperature quenching heating temperature is selected between 740-810 ℃. Sub-temperature quenching selected heating temperature 780 ℃, quenching heating holding time 15min; as sub-temperature quenching in the α + γ two-phase zone heating, quenching in the retention of part of the undissolved ferrite state, while maintaining the temperature, toughness can be improved.

Oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure the drilling process is carried out and the normal operation of the whole well after completion. Several layers of casing are used in each well depending on the drilling depth and geology. The casing is cemented after the well is drilled, and unlike tubing and drill pipe, it is not reusable and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70 percent of all oil well tubing. Casing can be classified according to usage: conduit, surface casing, technical casing and oil casing.

Oil casing is the lifeline for maintaining the operation of oil wells. Due to different geological conditions, the downhole stress state is complex, and the combined effects of tensile, compressive, bending and torsional stresses act on the tubular body, which places high demands on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to production reduction of the whole well or even scrapping. According to the strength of the steel itself, casing can be divided into different steel grades, i.e. J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different well conditions and depths require different steel grades. In corrosive environments, the casing itself is required to have corrosion resistance. In places with complex geological conditions, the casing is also required to have anti-crushing properties and anti-microbial erosion.

Oil special pipe is mainly used for oil and gas well drilling and oil and gas transmission. It includes oil drilling pipe, oil casing and oil pumping pipe. Oil drill pipe is mainly used to connect drill collar and drill bit and transmit drilling power. Oil casing is mainly used to support the well wall during the drilling process and after completion to ensure the drilling process and the normal operation of the whole well after completion. The pumping tubing is mainly used to transport oil and gas from the bottom of the well to the surface.

Defects between the length of the L C and the vanishing point of the thread are allowed to extend no deeper than the cone of the thread base diameter or no greater than 12.5% of the specified wall thickness (whichever is greater), but no corrosion products are allowed on the thread surface. Grinding and dressing are permitted to eliminate defects, but grinding and filing are not permitted to eliminate pits. The outer chamfer (65°) is guaranteed to be complete around the 360° circumference of the pipe end, with the chamfer diameter such that the thread root disappears on the chamfered surface rather than on the pipe end, and without a sharp edge. The outer chamfer should be 65° to 70°; the inner chamfer should be 360° full circle and 40° to 50°, and if there is any unchamfered part, the chamfer should be hand filed.

Oil casing is a large diameter pipe that holds the wall or borehole of oil and gas wells in place. The casing is inserted into the borehole and fixed with cement to prevent the borehole from separating the rock formation and collapsing, and to ensure the circulation of drilling mud to facilitate drilling and extraction. 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 trapezoidal thread, special buckle, etc. It is mainly used for oil well drilling to support the well wall during the drilling process and after the completion of the well to ensure the normal operation of the whole well after the drilling process and completion of the well.

The oil industry is an industry that uses a large amount of oil tubing, and oil tubing plays a very important role in the oil industry: the amount of oil tubing used is large and costly, and the potential to save money and reduce costs is huge. The consumption of oil tubing can be projected by the amount of feet drilled each year. According to the specific situation in China, roughly 62kg of oil well pipe is needed for every 1m drilled, including 48kg of casing and 10kg of tubing. a blind groove of the same size as the cut is corroded on the inner wall of the pipe. Drill pipe 3kg, drill collar 0.5kg; 2 the mechanical and environmental behavior of oil pipe has an important impact on the oil industry to adopt advanced technology and increase production and efficiency; 3 oil pipe failure loss is huge, reliability and oil life is significant to the oil industry. [(OD – wall thickness)wall thickness]0.02466=kg/m (weight per meter).

The steel grade used varies by well condition and depth. In corrosive environments, the casing itself is required to have anti-corrosion properties, and API seamless steel pipe is also required to have anti-crushing properties in places with complex geological conditions. The pumping pipe mainly transports oil and gas from the bottom of oil wells to the surface. Threaded connection forms: short round threaded casing (STC); long round threaded casing (LTC) bias trapezoidal threaded casing (BTC); straight connected casing (XC) non-thickened tubing (NU); externally thickened tubing (EU); integral joint 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 by CNC turning wire. The joint adopts the international advanced pure manganese high-temperature phosphating process, with strong phosphate film bonding, uniform and dense crystallization, high hardness, corrosion resistance and anti-buckling ability. 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, etc.

J55 petroleum casing, K55 petroleum casing, N80 petroleum casing, P110 petroleum casing, partial ladder buckle petroleum casing, long round buckle petroleum casing, short round buckle petroleum casing, J55 partial ladder buckle petroleum casing, J55 long round buckle petroleum casing, J55 short round buckle petroleum casing, K55 partial ladder buckle petroleum casing, K55 long round buckle petroleum casing, K55 short round buckle petroleum casing, N80 partial ladder buckle Petroleum casing, N80 long round buckle petroleum casing, N80 short round buckle petroleum casing, P110 offset ladder buckle petroleum casing, P110 long round buckle petroleum casing, P110 short round buckle petroleum casing, API5CTSTC short round buckle STC petroleum casing, API5CT long round buckle LTC petroleum casing, API5CT offset ladder buckle BTC petroleum casing, long round thread buckle J55 petroleum casing, K55 long round buckle K55 petroleum casing Long round thread buckle K55 oil casing, long round thread buckle N80 oil casing, long round thread buckle P110 oil casing, short round thread buckle J55 oil casing, short round thread buckle K55 oil casing, short round thread buckle N80 oil casing, short round thread buckle P110 oil casing, offset ladder thread buckle J55 oil casing, offset ladder thread buckle K55 oil casing, offset ladder thread buckle N80 oil casing, offset ladder thread buckle P110 oil casing The casing is used instead of drill pipe to apply torque and drilling pressure to the drill bit to achieve bit rotation and drilling. The whole drilling process no longer uses drill pipe, drill collar, etc. The drill bit is lifted and lowered inside the casing by using wire rope casting, which means that the drill bit drilling tools can be replaced without lifting the drill, reducing the accidents such as starting and lowering the drill and well blowout and stuck drilling, improving the reliability of drilling and reducing the cost.

When the well is drilled to the destination layer (oil and gas-bearing layer), the oil layer casing is needed to seal the oil and gas layer and the upper exposed strata, and the oil layer is inside the casing. The oil layer casing is the deepest among all types of casing, and its mechanical properties and sealing performance are the highest, using steel grades such as J 55, N80, P110, Q125 and V150. The main specifications of oil casing are: 177.8mm(7in), 168.28mm(6-5/8in), 139.7mm(5-1/2in), 127mm(5in), 114.3mm(4-1/2in), etc.
Ltd. supplies seamless pipes, structural pipes, fluid pipes, medium, low and high pressure boiler pipes, fertilizer pipes from several major steel mills such as Yegang, Baosteel, Chengsteel, Baosteel, Tianjin, Xining, etc. Petroleum cracking pipe, power pipe. Imported alloy pipe . High pressure alloy seamless pipe . American Standard seamless pipe . Stainless steel seamless pipe . Welded tubes, cast tubes, bridge tubes, marine tubes. The main material standards of seamless pipes are: 10#, 20#, 35#, 45#, 20G, GB, GB, GB, GB, GB, GB, GB, GB, 16Mn, 27simn, 15Crmo, 35Crmo, 40Cr, 10Crmo910, 12Cr1mov, 12Cr1movg, A335 10Crmo910, 12Cr1mov, 12Cr1movg, A335P22, D240, D250, N80, A335P91, etc. Stainless steel seamless pipe materials in China are as follows: 0Cr18NI9, 1Cr18NI9Ti, 00Cr17Ni14M02, 0Cr17Ni12m02, 00Cr19Ni1o, 0Cr18Ni12M02Ti, 0cr25Ni20, oocr19Ni13M03, etc., USA Stainless steel pipe materials are as follows: 301, 302, 304, 304L, 304H, 305, 316, 316L, 316Ti, 317, 317L, 310S, 321, 321H, 347H, etc. Imported – domestic high pressure alloy pipe materials: A335P11, P91, P92, 15Crmog, 12Cr1movg, 1Cr5mo, 15crmo, 35crmo, 12Cr1mov, 10Crmo910, A335P91, 1cr2mo, 15mnv, 37mn5, 15mnv, 37mn5, 347H, etc. 15mnv, 37mn5, 10Cr9mo1vNb, 15NicumoNb5, 12Cr2mowvTiB, WB36, sA106B, etc. .
Petroleum casing standard】SY/T American Standard ARISPEC5CT-1988 【Oil casing overview】 Petroleum casing is an important equipment for oil drilling, its main equipment also includes drill pipe, core pipe and casing, drill collar and small diameter drilling steel pipe. Domestic casing made of geological drilling steel by hot-rolled or cold-drawn, steel number with ” geological ” (DZ) indicates that the commonly used casing steel grade DZ40 , DZ55 , DZ753 species. Petroleum casing use]: used for oil well drilling mainly for the drilling process and after the completion of the well wall support, to ensure the normal operation of the drilling process and the completion of the entire well, [Petroleum casing types and packaging] according to SY / T ” petroleum casing ” short thread casing and its clamps and long thread casing and its clamps Two kinds. According to SY/T, domestic casing should be tied with steel wire or steel tape. Each casing and the exposed part of the thread of the clamp should be screwed on the protection ring to protect the thread. Material of oil casing steel grade】 J55, K55, N80, L80, C90, T95, P110, Q125, V150, H-40, J-55, N-80, P-110, C-75, C-95, etc.

In the working process of the screw pump, the rotor rotation will trigger the twisting and vibration of the oil pipe. In addition, the J-groove of the tubing junction is subject to high friction during the extraction process, which is where most of the tubing damage and deterioration problems occur. At the same time, operators have been looking for a “magic tool” that can improve the casing torque rating and reduce costs at the same time. With the DTR tool, casing connection is no longer a problem! DeltaTORQ Rings (DTR) is a new casing connection kit designed specifically for the upstream oil and gas industry to increase the torque load of casing clamps. The DTR makes perfect use of the J-groove in the casing joint, providing excellent sealing performance in addition to increasing the torque rating of the tubing. The use of the DTR tool eliminates the need for other tools and greatly simplifies the screw pump completion operation. At the same time, the tool is perfectly embedded in the J-slot, making the inner surface of the tubing smoother and reducing frictional losses. The DTR is available in various sizes to meet all casing requirements in accordance with API-5CT standards. During field operations, DTRs are installed by specially designed handheld tools and are calibrated after connection, improving efficiency and reliability. In addition, if the field operation time is tight, DTR can also be installed inside the oil casing in advance without affecting its own reliable working performance. It can be said that the DTR tool brought by Volant has greatly reduced the risk of casing docking problems.

Operational Problem 1 When casing or tail pipe rotation is required, casing designed according to standard API torque standards usually cannot meet the operational torque requirements, which is one of the most frequent and persistent problems in the field. Solution: The DTR is designed to make full use of the J-shaped space at the casing joint. The tool has a high cross-sectional area, which can significantly increase the torque carrying capacity of the oil casing junction hoop, thus improving the operating capacity of the entire string.

Operational challenge 2 The rotor of a cavity pump rotates in the opposite direction of the tubing threads, so it is very common for the tubing to back out during cavity pump operation, and if not detected and resolved in time, the tubing will eventually fall off, resulting in costly workovers. Solution: The DTR can be perfectly embedded in the tubing kink, increasing the torque level and greatly reducing the chance of tubing uncoupling, which is of great value in improving stability, reducing the number of well repairs and increasing production revenue.

Operational challenge 3 As the tubing is used more often, the threads become more worn and eventually thread damage (such as penetration) occurs. To solve such problems, operators must cut and regrind the threads, which undoubtedly increases development costs. For this reason, developers have been actively looking for solutions to mitigate thread wear. Solution: DTR can provide long-lasting protection to the tubing knotting hoop, ensuring reasonable torque and keeping the threads in the best connection condition, effectively extending the life of the tubing.

Operational challenge 4
During the production process of oil ring, the oil pipe is often filled with high-speed flowing gas, sand and other substances, which directly accelerates the wear of J-shaped groove at the oil pipe connection (due to the groove, the smoothness is poor) and reduces the service life of the oil pipe. Solution: DTR makes the J-groove embedded in the tubing junction more smooth, effectively reduces friction, protects the junction and extends the service life of tubing. MLT protection ring, specially made for oil casing connection! MLT is designed to meet the API standard and can play a great role in improving the success rate, whether it is a downstream casing operation or a cementing operation that requires rotary operation. With MLT, field work is so easy.

The problem: Tubing The top drive screw pump is driven by a shaft that connects the surface drive to the downhole screw pump, which usually rotates in the opposite direction of the tubing thread connection, which can cause tubing backing problems and necessitate workovers. Solution: Placing the MLT at the tubing kink can improve the thread torque rating, prevent backbolts, and reduce the use of other equipment, which saves money and increases the life of the tubing. In addition, MLT prevents sand from collecting in the kink, which keeps the threads clean and extends the life of the tubing. Operational challenge: tubing threads We know that tubing connections are made very quickly during field operations, sometimes causing problems such as excessive torque and thread damage. As the number of times the tubing is used increases, the threads become more worn, and eventually the threads have to be removed or reground. There was nothing much many developers could do about the problem, but now the situation has changed dramatically because of MLT. The solution: Volant’s MLT protection ring acts on the knotted hoop to provide protection during the thread connection, keeping the thread butt in ideal condition and effectively preventing excessive torque, which has many benefits for extending the life of the tubing threads.

Operational challenge: J-groove of the clamp The high velocity flow of gas in the tubing can wear the J-groove inside the clamp. Solution: MLT fills the J-groove to make the inner part of the clamp smoother, reducing the abrasive effect of the gas and extending the life of the tubing. Operational Challenge: Casing In wells with complex downhole conditions, casing entry operations often rely on rotations and other operations to overcome frictional resistance. The rotation of the casing requires the cooperation of the top drive, CRT and tubing, and the ability of the casing to withstand a large enough torque is the key to the success of the operation. Solution: MLT can improve the tapered shape of the tubing male buckle (which is easily damaged during operation) to a certain extent, and provide protection to the tubing while increasing the rotational torque level of the knotted hoop.

Operational challenge: Casing threads Casing threads are often misbonded during casing butt joints, which reduces the working strength and sealing performance of the casing.

p110 oil casing as oil casing is an important equipment for oil drilling, to our industrial construction and other practical activities to bring many positive impact and role, so what in-depth understanding of its en, small editors small popularization for you.

The basic introduction and performance analysis of p110 oil casing

I. Introduction

(1) The main importing countries of petroleum casing are: Germany, Japan, Romania, Czech Republic, Italy, Britain, Austria, Switzerland, the United States, Argentina, Singapore are also imported. Import

The standard mostly refers to the American Petroleum Institute standard API5A, 5AX, 5AC. steel grade is H-40, J-55, N-80, P-110, C-75, C-95, etc.. The specifications are mainly 139.77.72R-2, 177.89.19R-2, 244.58.94R-2, 244.510.03R-2, 244.511.05R-2, etc.

(2) There are three kinds of lengths specified by API: namely R-1 for 4.88 to 7.62m, R-2 for 7.62 to 10.36m, and R-3 for 10.36m to longer.

(3) Some of the imported goods are marked with the word LTC, i.e. long silk buckle casing.

(4) Imported casing from Japan in addition to the use of API standards, there are a small number of implementation of Japanese factory standards (such as Nippon Steel, Sumitomo, Kawasaki, etc.), steel grades are NC-55E, NC-80E, NC-L80, NC-80HE, etc.

(5) In the claim cases, there have been black buckle, wire buckle damage, tube body folding, broken buckle and thread tightness distance is over poor, joint J value is over poor and other appearance defects and casing brittle crack, low yield strength and other intrinsic quality problems.

II. Types

According to SY/T6194-96 “petroleum casing” is divided into two kinds of short threaded casing and its coupling and long threaded casing and its coupling.

Specification and appearance quality

(1) Domestic casing according to SY/T6194-96, the length of the casing is variable, the range of 8-13 m. But not shorter than 6 m of casing can be provided, the number of not more than 20%.

(2) The internal and external surfaces of the casing shall not have folding, hairline, delamination, cracks, rolling folds and scars. These defects shall be completely removed and the removal depth shall not exceed 12.5% of the nominal wall thickness.

(3) The outer surface of the joint shall not have defects such as folding, hairline, delamination, cracking, rolling, folding and scarring.

(4) The surface of casing and coupling threads shall be smooth, and no burrs, tears and other defects sufficient to interrupt the threads to affect the strength and tight connection are allowed.

III. Chemical composition inspection

(1)According to SY/T6194-96. The same steel grade is used for the casing and its coupling. Sulfur content of 0.045%, phosphorus content of 0.045%.

(2) according to the provisions of GB222-84 to take chemical analysis samples. Chemical analysis in accordance with the provisions of the relevant part of GB223.

(3) American Petroleum Institute ARISPEC5CT1988 1st edition regulations. Chemical analysis according to the new version of ASTME59 sample preparation, chemical analysis according to the new version of ASTME350.

Fourth, physical properties test

(1) According to SY/T6194-96. Do flattening test (GB246-97) tensile test (GB228-87) and hydrostatic test.

(2) According to the American Petroleum Institute APISPEC5CT 1988, 1st edition, hydrostatic test, flattening test, sulfide stress corrosion cracking test, hardness test (ASTME18 or E10 new version of the provisions of the test), tensile test, transverse impact test (ASTMA370, ASTME23 and the relevant standard new version of the provisions of the test), grain size determination (ASTME112 new version or other methods).

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