oil casing pipe theoretical weight Specifications

Domestic oil casing theoretical weight Specifications

 

     Casing is important to oil drilling equipment, and its main equipment also includes drill, core and casing pipe, drill collars and drilling small diameter steel pipe and so on. Domestic steel casing drilling through geological hot-rolled or cold-drawn steel, steel with "geology" (DZ) , said common grade steel casing has DZ40 , DZ55 , DZ753 species.

      1 Purpose

　　Used in oil well drilling.

      2 species

　　Press SY/T6194-96 "Casing" sub-thread casing and short and long threaded coupling sleeve and coupling two kinds.

      3 Specifications and appearance quality

　　(1) Domestic casing by SY/T6194-96 regulations, not length sleeve length, range 8-13m . But not less than 6msleeve may be provided in an amount not exceeding 20% .

　　(2) There shall be no internal and external surface casing folded hairline, separation, crack, rolled off and scarring. These defects should be completely removed, clear the depth does not exceed the nominal wall thickness of12.5 percent .

　　(3) the outer surface of the coupling may not have collapsed, hairline, separation, crack, rolled off, scarring and other defects.

　　(4) threaded coupling sleeve and the surface should be smooth, not allowed to have glitches, tear and impact strength enough to break the thread tight junctions and other defects. 4 Chemical composition test

　　(1) according to SY/T6194-96 regulations. Casing and couplings using the same grade. Sulfur content of < 0.045%, a phosphorus content of < 0.045% .

　　(2) according to GB222-84 required to take samples for chemical analysis. Press GB223 chemical analysis relating to predetermined portions.

　　(3) American Petroleum Institute ARISPEC5CT1988 Section 1 edition regulations. Chemical analysis by ASTME59latest version of sample preparation, according ASTME350 latest version for chemical analysis.

      5 physical performance test

　　(1) according to SY/T6194-96 regulations. For flattening test (GB246-97) tensile testing (GB228-87) and the pressure test.

　　(2) according to the American Petroleum Institute APISPEC5CT1988 on a version requirements for hydrostatic pressure test, flattening test, sulfide stress corrosion cracking test, hardness test (ASTME18 or E10 latest version provisions ) , tensile test, the lateral impact test ( ASTMA370 , ASTME23 the latest version of the standards and provisions ) , grain size determination (ASTME112 latest version or other methods ) .

      6 main import and export situation

　　(1) Casing major importing countries: Germany, Japan, Romania, the Czech Republic, Italy, Britain, Austria, Switzerland, the United States, Argentina, Singapore also imports. Imported American Petroleum Institute standard multi-reference standard API5A , 5AX , 5AC . A grade H-40 , J-55 , N-80 , P-110 , C-75 , C-95 and the like.Specifications are mainly 139.77.72R-2 , 177.89.19R-2 , 244.58.94R-2 , 244.510.03R-2 , 244.511.05R-2 and so on.

　　(2) API predetermined length of three: R-1 is 4.88 ~ 7.62m , R-2 is 7.62 ~ 10.36m , R-3 is 10.36m to longer.

　　(3) some of the imported goods are marked with LTC words, that filament buckle casing.

　　(4) In addition to the use of imported from Japan casing API standards, as well as a small part of the implementation of the Japanese factory standards ( such as Nippon Steel, Sumitomo, Kawasaki, etc. ) , steel is NC-55E, 80E-NC , NC-L85 , NC-80HE and so on.

　　(5) In the case of claims, there have been black buckle, threaded injury, tube folding, breaking away from the buckle and screw tight tolerance, coupling J value of the ultra-poor cosmetic defects and casing rattle, yield strength and low intrinsic quality problems.

      7. Packaging

　　By SY/T6194-96 regulations, domestic steel or steel casing should be bundled. Each threaded coupling sleeve and the exposed portion of the guard ring should be screwed on to protect the threads.

      8 Others

　　According to the American Petroleum Institute Standard APISPEC5CT1988 on one version, the steel casing fraction H-40 , J-55 , K-55 , N-80 , C-75 , L-80 , C-90 , C-95 , P- 110 , Q-125 a total of 10 species.

　　Casing should be threaded and coupled with supply, or by any of the following forms one end of the tube to supply:

　　Flat side, round thread coupling or belt without couplings, coupling buttress with or without collar, straight threaded, special end processing, ring structure.

      OCTG purposes and categories

　　OCTG mainly used to transport oil and gas well drilling and oil and gas. It includes oil drilling pipe, oil casing, pump tubing. Oil drill pipe and drill collar is mainly used to connect the drill bit and drilling power transmission. Casing is mainly used to support the rear of the borehole during drilling and completion, to ensure that after the drilling and completion of wells throughout the normal operation. The main pipeline pumping oil at the bottom of the oil, gas transmission to the ground.

　　Oil well casing is run to maintain the lifeline. Due to the different geological conditions, underground complex stress state, pulling, pressing, bending, torsional stress acting on the combined effect of the tube, which is the quality of the casing itself raised higher requirements. Once the sleeve itself is damaged for some reason, may cause the entire production wells, or scrapped.

　　According to the strength of the steel casing itself can be divided into different steel grades, namely J55 , K55 ,N80 , L85 , C90 , T95 , P110 , Q125 , V150 and so on. Well conditions, depth of different steel grade used is also different. In corrosive environments also require the casing itself has corrosion resistance. Place in complex geological conditions also require casing with anti-collapse properties.

Casing toughening heat treatment process

　　27MnCrV production TP110T grade new steel oil pipe sleeve, conventional production TP110T grade steel oil pipe sleeve is 29CrMo44 and 26CrMo4 . Both relative to the rear 27MnCrV contain less Mo elements can greatly reduce the production cost. However, the use of hardened austenitic normal production process 27MnCrV obvious after tempering brittleness, resulting in low impact toughness and unstable.

　　Solve such problems are usually handled in two ways: First, after rapid cooling method using the tempering temperature to avoid brittle, get toughness. The second is through subcritical quenching method is not fully austenitic steels of harmful elements in order to effectively improve and impurities, improve toughness. The first method of heat treatment equipment requirements are relatively stringent, the need to add extra cost.

　　27MnCrV steel AC1 = 736 ℃, AC3 = 810 ℃, the heating temperature in the subcritical quenching 740-810 ℃ select between. Subcritical quenching select the heating temperature 780 ℃, holding time quenching 15min ; selected after quenching and tempering temperature 630 ℃, tempering heating holding time 50min . As the temperature quenching in alpha + heating γ two-phase region in the state to retain some undissolved ferrite under quenching, while maintaining high strength and toughness can be improved.

　　While lower temperatures than conventional temperature quenching, quenching is reduced stress, thereby reducing the deformation hardening, thus ensuring the smooth operation of the production of heat-treated, but also for the subsequent work vehicle filament materials provide good.

　　At present, the technology has been applied in Tianjin Steel pipe factory warranty data show that the yield strength of steel after heat treatment Rt0.6 at 820-860 MPa , tensile strength Rm in 910-940MPa , impact toughness Akv in 65-85J room, invulnerability performance 100% qualified. Data show that, 27MnCrV pipe is already quite high quality high-grade steel casing, on the other hand also shows that subcritical quenching process is an excellent way to avoid the production of steel products during high-temperature brittleness.

　　Casing is a large-diameter pipes, play a role in fixing the oil and gas wells, or wellbore wall. The casing is inserted into the borehole, the cement is fixed, spaced apart from the wellbore to prevent the formation and borehole collapse and to ensure circulation of the drilling mud to the drilling mining. Different types of casing used in oil extraction process: Surface Casing - Protection of drilling to avoid the shallow aquifers and shallow gas pollution - supporting wellhead equipment and other layers to keep the weight of the casing. Technical oil casing - separate the different levels of pressure, so that the normal flow of drilling fluid lines and protect the production casing. - to install anti-burst device, leak-proof devices and tail pipe in the drilling. Reservoir oil casing - to export oil and gas from the storage layer under the surface there. - for the protection of drilling, the drilling mud layers. When oil casing production, diameter is usually 114.3 mm to 508 mm.

 

 

    

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